BS en 12952-2-2011

BS EN 12952-2:2011
BSI Standards Publication
Water-tube boilers and

auxiliary installations
Part 2: Materials for pressure parts of
boilers and accessories
BS EN 12952-2:2011 BRITISH STANDARD
National foreword
This British Standard is the UK implementation of EN 12952-2:2011.
It supersedes BS EN 12952-2:2001 which is withdrawn.
The UK participation in its preparation was entrusted to Technical
Committee PVE/2, Water Tube And Shell Boilers.
A list of organizations represented on this committee can be
obtained on request to its secretary.
This publication does not purport to include all the necessary
provisions of a contract. Users are responsible for its correct
application.
© BSI 2011
ISBN 978 0 580 63552 6
ICS 23.020.01; 27.040; 27.060.30
Compliance with a British Standard cannot confer immunity from
legal obligations.
This British Standard was published under the authority of the
Standards Policy and Strategy Committee on 31 August 2011.
Amendments issued since publication
Date Text affected
BS EN 12952-2:2011
EUROPEAN STANDARD EN 12952-2

NORME EUROPÉENNE
EUROPÄISCHE NORM August 2011
ICS 27.040 Supersedes EN 12952-2:2001
English Version
Water-tube boilers and auxiliary installations - Part 2: Materials

for pressure parts of boilers and accessories
Chaudières à tubes d'eau et installations auxiliaires - Partie Wasserrohrkessel und Anlagenkomponenten - Teil 2:
2: Matériaux des parties sous pression des chaudières et Werkstoffe für drucktragende Kesselteile und Zubehör
accessoires
This European Standard was approved by CEN on 25 June 2011.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION

COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12952-2:2011: E
worldwide for CEN national Members.
BS EN 12952-2:2011
EN 12952-2:2011 (E)
Contents Page
Foreword..............................................................................................................................................................3
1 Scope ......................................................................................................................................................5
2 Normative references ............................................................................................................................5
3 General requirements ............................................................................................................................9
3.1 Selection of materials with regard to service conditions ..................................................................9
3.2 Selection of materials with regard to fabrication ...............................................................................9
3.3 Material specification ............................................................................................................................9
3.3.1 General....................................................................................................................................................9
3.3.2 European Standards ..............................................................................................................................9
3.3.3 European approvals for materials .......................................................................................................9
3.3.4 Particular material appraisals.............................................................................................................10
3.4 Consideration of special materials properties .................................................................................10
3.5 Contents of material specification .....................................................................................................10
3.6 Compliance and inspection documentation of materials ................................................................11
4 Material for pressure parts .................................................................................................................11
4.1 Materials covered by harmonized European product Standards for pressure purposes ...........11
4.1.1 Flat products, forgings, castings, tubes, fittings, flanges and valve bodies ................................11
4.1.2 Cast iron ...............................................................................................................................................11
4.1.3 Studs, bolts and nuts ..........................................................................................................................11
4.1.4 Welding consumables .........................................................................................................................11
4.1.5 Requirements for plates used for heads ...........................................................................................11
4.1.6 Requirements for non-destructive examination ...............................................................................12
4.1.7 Inspection documents .........................................................................................................................13
4.1.8 Marking .................................................................................................................................................13
4.2 Material covered by European approvals of materials for pressure equipment –
technical requirements .......................................................................................................................13
4.2.1 General..................................................................................................................................................13
4.2.2 Manufacture..........................................................................................................................................13
4.2.3 Heat treatment condition ....................................................................................................................13
4.2.4 Chemical composition ........................................................................................................................14
4.2.5 Mechanical and technological properties .........................................................................................14
4.3 Materials with particular material appraisals ....................................................................................17
5 Materials for non-pressure parts .......................................................................................................18
6 Inspection documentation ..................................................................................................................19
Annex A (normative) Materials covered by European material Standards .................................................20
Annex B (normative) Establishment of creep rupture strength values for new materials ........................31
Annex C (normative) Special requirements for composite tubes ................................................................32
Annex D (informative) Significant technical changes between this European Standard and the
previous edition ...................................................................................................................................36
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of Directive 97/23/EC ..................................................................................................37
Bibliography ......................................................................................................................................................38
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BS EN 12952-2:2011
EN 12952-2:2011 (E)
Foreword
This document (EN 12952-2:2011) has been prepared by Technical Committee CEN/TC 269 “Shell and
water-tube boilers”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by February 2012, and conflicting national standards shall be withdrawn
at the latest by February 2012.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 12952-2:2001.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive 97/23/EC, see informative Annex ZA, which is an integral part of this
document.
Annex D provides details of significant technical changes between this European Standard and the previous
edition.
The European Standard series EN 12952 concerning water-tube boilers and auxiliary installations consists of
the following parts:
 Part 1: General;
 Part 2: Materials for pressure parts of boilers and accessories;
 Part 3: Design and calculation for pressure parts;
 Part 4: In-service boiler life expectancy calculations
 Part 5: Workmanship and construction of pressure parts of the boiler;
 Part 6: Inspection during construction, documentation and marking of pressure parts of the boiler;
 Part 7: Requirements for equipment for the boiler;
 Part 8: Requirements for firing systems for liquid and gaseous fuels for the boiler;
 Part 9: Requirements for firing systems for pulverized solid fuels for the boiler;
 Part 10: Requirements for safeguards against excessive pressure;
 Part 11: Requirements for limiting devices of the boiler and accessories;
 Part 12: Requirements for boiler feedwater and boiler water quality;
 Part 13: Requirements for flue gas cleaning systems;
 Part 14: Requirements for flue gas DENOX-systems using liquefied pressurized ammonia and ammonia
water solution;
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EN 12952-2:2011 (E)
 Part 15: Acceptance tests;
 Part 16: Requirements for grate and fluidized-bed firing systems for solid fuels for the boiler;
 CR 12952 Part 17: Guideline for the involvement of an inspection body independent of the
manufacturer.
NOTE 1 A Part 18 on operating instructions is currently in preparation.
Although these parts may be obtained separately, it should be recognized that the parts are inter-dependent.
As such, the design and manufacture of water-tube boilers requires the application of more than one part in
order for the requirements of the European Standard to be satisfactorily fulfilled.
NOTE 2 Part 4 and Part 15 are not applicable during the design, construction and installation stages.
NOTE 3 A "Boiler Helpdesk" has been established in CEN/TC 269 which may be contacted for any questions
regarding the application of European Standards series EN 12952 and EN 12953, see the following website:
http://www.boiler-helpdesk.din.de
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus,
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.
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BS EN 12952-2:2011
EN 12952-2:2011 (E)
1 Scope
This European Standard specifies the requirements for the product forms for use in pressure parts of water-
tube boilers and for parts welded on to pressure parts:
 plates;
 wrought seamless tubes;
 electrically welded tubes;
 submerged, plasma and TIG arc-welded tubes;
 forgings;
 castings;
 rolled bars;
 welding consumables;
 fasteners;
 seamless composite tubes.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 757:1997, Welding consumables — Covered electrodes for manual metal arc welding of high strength
steels — Classification
EN 760:1996, Welding consumables — Fluxes for submerged arc welding — Classification
EN 764-4:2002, Pressure equipment — Part 4: Establishment of technical delivery conditions for metallic
materials
EN 764-5:2002, Pressure equipment — Part 5: Compliance and inspection documentation of materials
EN 1092-1:2007, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN
designated — Part 1: Steel flanges
EN 1503-1:2000, Valves — Materials for bodies, bonnets and covers — Part 1: Steels specified in European
Standards
EN 1503-2:2000, Valves — Materials for bodies, bonnets and covers — Part 2: Steels other than those
specified in European Standards
EN 1600:1997, Welding consumables — Covered electrodes for manual metal arc welding of stainless and
heat resisting steels — Classification
EN 1759-1:2004, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, class
designated — Part 1: Steel flanges, NPS ½ to 24
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EN 12952-2:2011 (E)
EN 10021, General technical delivery conditions for steel products
EN 10028-2:2009, Flat products made of steels for pressure purposes — Part 2: Non-alloy and alloy steels
with specified elevated temperature properties
EN 10028-3:2009, Flat products made of steels for pressure purposes — Part 3: Weldable fine grain steels,
normalized
EN 10028-7:2007, Flat products made of steels for pressure purposes — Part 7: Stainless steels
EN 10160:1999, Ultrasonic testing of steel flat product of thickness equal or greater than 6 mm (reflection
method)
EN 10164:2004, Steel products with improved deformation properties perpendicular to the surface of the
product — Technical delivery conditions
EN 10204:2004, Metallic products — Types of inspection documents
EN 10213:2007, Steel castings for pressure purposes
EN 10216-2, Seamless steel tubes for pressure purposes — Technical delivery conditions — Part 2: Non-
alloy and alloy steel tubes with specified elevated temperature properties
EN 10216-3:2002, Seamless steel tubes for pressure purposes — Technical delivery conditions — Part 3:
Alloy fine grain steel tubes
EN 10216-5:2004, Seamless steel tubes for pressure purposes — Technical delivery conditions — Part 5:
Stainless steel tubes
EN 10217-2:2002, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 2:
Electric welded non-alloy and alloy steel tubes with specified elevated temperature properties
EN 10217-3:2002, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 3: Alloy
fine grain steel tubes
EN 10217-5, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 5:
Submerged arc welded non-alloy and alloy steel tubes with specified elevated temperature properties
EN 10217-7:2005, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 7:
Stainless steel tubes
EN 10222-2:1999, Steel forgings for pressure purposes — Part 2: Ferritic and martensitic steels with
specified elevated temperature properties
EN 10222-3:1998, Steel forgings for pressure purposes — Part 3: Nickel steels with specified low
temperature properties
EN 10222-4:1998, Steel forgings for pressure purposes — Part 4: Weldable fine grain steels with high proof
strength
EN 10222-5:1999, Steel forgings for pressure purposes — Part 5: Martensitic, austenitic and austenitic-
ferritic stainless steels
EN 10228-1:1999, Non-destructive testing of steel forgings — Part 1: Magnetic particle inspection
EN 10228-2:1998, Non-destructive testing of steel forgings — Part 2: Penetrant testing
EN 10228-3:1998, Non-destructive testing of steel forgings — Part 3: Ultrasonic testing of ferritic or

martensitic steel forgings
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EN 12952-2:2011 (E)
EN 10253-2:2007, Butt-welding pipe fittings — Part 2: Non alloy and ferritic alloy steels with specific
inspection requirements
EN 10253-4, Butt-welding pipe fittings — Part 4: Wrought austenitic and austenitic-ferritic (duplex) stainless
steels with specific inspection requirements
EN 10254:1999, Steel closed die forgings — General technical delivery conditions
EN 10269:1999, Steels and nickel alloys for fasteners with specified elevated and/or low temperature
properties
EN 10273:2007, Hot rolled weldable steel bars for pressure purposes with specified elevated temperature
properties
EN 10308:2001, Non destructive testing — Ultrasonic testing of steel bars
EN 10314, Method for the derivation of minimum values of proof strength of steel at elevated temperatures
EN 12074:2000, Welding consumables — Quality requirements for manufacture, supply and distribution of
consumables for welding and allied processes
EN 12536:2000, Welding consumables — Rods for gas welding of non alloy and creep-resisting steels —
Classification
EN 12952-3:2011, Water-tube boilers and auxiliary installations — Part 3: Design and calculation for
pressure parts
EN 12952-5:2011, Water-tube boilers and auxiliary installations — Part 5: Workmanship and construction of
pressure parts of the boiler
EN 12952-6:2011, Water-tube boilers and auxiliary installations — Part 6: Inspection during construction,
documentation and marking of pressure parts of the boiler
EN 12952-7:2002, Water-tube boilers and auxiliary installations — Part 7: Requirements for equipment for
the boiler
EN 12952-12:2003, Water-tube boilers and auxiliary installations — Part 12: Requirements for boiler
feedwater and boiler water quality
EN 13479:2004, Welding consumables — General product standard for filler metals and fluxes for fusion
welding of metallic materials
EN ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method (ISO 148-1:2009)
EN ISO 544:2011, Welding consumables — Technical delivery conditions for filler materials and fluxes —
Type of product, dimensions, tolerances and markings (ISO 544:2011)
EN ISO 636:2008, Welding consumables — Rods, wires and deposits for tungsten inert gas welding of non-
alloy and fine-grain steels — Classification (ISO 636:2004)
EN ISO 2560:2009, Welding consumables — Covered electrodes for manual metal arc welding of non-alloy
and fine grain steels — Classification (ISO 2560:2009)
EN ISO 2566-1, Steel — Conversion of elongation values — Part 1: Carbon and low alloy steels
(ISO 2566-1:1984)
EN ISO 2566-2, Steel — Conversion of elongation values — Part 2: Austenitic steels (ISO 2566-2:1984)
EN ISO 3580:2011, Welding consumables — Covered electrodes for manual metal arc welding of creep-
resisting steels — Classification (ISO 3580:2010)
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EN 12952-2:2011 (E)
EN ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature (ISO
6892-1:2009)
EN ISO 6892-2, Metallic materials — Tensile testing — Part 2: Method of test at elevated temperature (ISO
6892-2:2011)
EN ISO 8495, Metallic materials — Tube — Ring-expanding test (ISO 8495:1998)
EN ISO 10893-10, Non-destructive testing of steel tubes — Part 10: Automatic full peripheral ultrasonic
testing of seamless and welded (except submerged arc-welded) steel tubes for the detection of longitudinal
and/or transverse imperfections (ISO 10893-10:2011)
EN ISO 14171:2010, Welding consumables — Solid wire electrodes, tubular cored electrodes and
electrode/flux combinations for submerged arc welding of non alloy and fine grain steels — Classification
(ISO 14171:2010)
prEN ISO 14174:2010, Welding consumables — Fluxes for submerged arc welding and electroslag welding
— Classification (ISO/DIS 14174:2010)
EN ISO 14341:2011, Welding consumables — Wire electrodes and weld deposits for gas shielded metal arc
welding of non alloy and fine grain steels — Classification (ISO 14341:2010)
EN ISO 14343:2009, Welding consumables — Wire electrodes, strip electrodes, wires and rods for arc
welding of stainless and heat resisting steels — Classification (ISO 14343:2009)
EN ISO 14344:2010, Welding consumables — Procurement of filler materials and fluxes (ISO 14344:2010)
EN ISO 16834:2007, Welding consumables — Wire electrodes, wires, rods and deposits for gas-shielded arc
welding of high strength steels — Classification (ISO 16834:2006)
EN ISO 17632:2008, Welding consumables — Tubular cored electrodes for gas shielded and non-gas
shielded metal arc welding of non-alloy and fine grain steels — Classification (ISO 17632:2004)
EN ISO 17633:2010, Welding consumables — Tubular cored electrodes and rods for gas shielded and non-
gas shielded metal arc welding of stainless and heat-resisting steels — Classification (ISO 17633:2010)
EN ISO 17634:2006, Welding consumables — Tubular cored electrodes for gas shielded metal arc welding
of creep-resisting steels — Classification (ISO 17634:2004)
EN ISO 18276:2006, Welding consumables — Tubular cored electrodes for gas-shielded and non-gas-
shielded metal arc welding of high-strength steels — Classification (ISO 18276:2005)
EN ISO 21952:2007, Welding consumables — Wire electrodes, wires, rods and deposits for gas-shielded arc
welding of creep-resisting steels — Classification (ISO 21952:2007)
EN ISO 24598:2007, Welding consumables — Solid wire electrodes, tubular cored electrodes and
electrode/flux combinations for submerged arc welding of creep-resisting steels — Classification (ISO
24598:2007)
EN ISO 26304:2009, Welding consumables — Solid wire electrodes, tubular cored electrodes and electrode-
flux combinations for submerged arc welding of high strength steels — Classification (ISO 26304:2008,
including Cor 1:2009)
ISO 3581:2003, Welding consumables — Covered electrodes for manual metal arc welding of stainless and
heat-resisting steels — Classification
ISO 6303, Pressure vessel steels not included in ISO 2604, Parts 1 to 6 — Derivation of long-time stress
rupture properties
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EN 12952-2:2011 (E)
ISO 18275:2011, Welding consumables — Covered electrodes for manual metal arc welding of high-strength
steels — Classification
CEN ISO/TR 15608:2005, Welding — Guidelines for a metallic materials grouping system
(ISO/TR 15608:2005)
3 General requirements
3.1 Selection of materials with regard to service conditions
The manufacturer of the water-tube boilers shall select the material (including welding consumables) for the
manufacture of the boilers so that, when the delivered material (including welding consumables) complies
with the requirements specified in the material order and when the design rules in EN 12952-3:2011 and the
rules for the fabrication, inspection and testing of the boilers in EN 12952-5:2011 and EN 12952-6:2011 are
observed, the boilers can be operated without hazard under the service conditions (pressures, temperatures,
environments, etc.) for the life time provided in the order for the boiler.
The materials specified in Clause 4 which satisfy the elongation and impact energy requirements of 4.2.5.3
and 4.2.5.4 respectively shall not be considered prone to brittle fracture during manufacture and subsequent
operation in accordance with the provisions of this European Standard. It is also considered that for
operation within the parameters specified in EN 12952-3:2011 using feedwater and boiler water as specified
in EN 12952-12:2003 the selected materials will not be significantly affected by ageing or chemical attack.
3.2 Selection of materials with regard to fabrication
The selection of the materials of construction for pressure parts of water-tube boilers and to parts welded on
pressure parts shall take into account the suitability of the material with regard to fabrication, e.g. cold and
hot forming, weldability, expanding, and heat treatment.
NOTE The rules for forming or post weld heat treatment are included in EN 12952-5:2011.
3.3 Material specification
3.3.1 General
The selection and order of materials for pressure parts shall be based on one of the following material
specifications for pressure equipment in the form of:
a) harmonized European material Standards;
b) European approval of material (EAM);
c) particular material appraisals.
3.3.2 European Standards
Materials in accordance with harmonized European Standards shall be selected for types, treatment
conditions and dimensions of products frequently used in Europe.
NOTE Materials in accordance with European Standards are given in Annex A.
3.3.3 European approvals for materials
European approvals for materials are intended for repeated use. They are established in accordance with
EN 764-4:2002 and apply to materials or treatment conditions and product forms or dimensions not covered
in a European material Standard for pressure equipment. Additionally to the requirements of EN 764-4:2002
the requirements of this European Standard shall be met.
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EN 12952-2:2011 (E)
NOTE Reference of available European approvals for materials is published in the Official Journal of the European
Union.
3.3.4 Particular material appraisals
Particular material appraisals apply for individual cases as for example:
a) a material or a product form or a thickness not covered by a European material Standard or EAM
intended for use in a particular pressure equipment;
b) a product specified in a European material Standard or EAM for materials for pressure equipment is
intended in an exceptional case for service conditions outside its specified range of application.
Where relevant to the pressure equipment under consideration the requirements given in EN 764-4:2002
should be considered. Additionally to the requirements of EN 764-4:2002 the requirements of this European
Standard shall be met.
3.4 Consideration of special materials properties
When materials are chosen with properties other than those specified in the material specification, or which
may influence the lifetime or the safe service behaviour of the water-tube boiler, they shall be taken into
account when selecting the material and its dimensions.
NOTE Examples are the scaling or ageing behaviour of the material.
3.5 Contents of material specification
The different types of specifications for materials for water-tube boilers include the clauses given in
Table 3.5-1 as a minimum.
Table 3.5-1 — Content of specifications for materials for pressure parts
Clauses EN standards European material data Particular

sheets material
appraisals
Unrestricted a restricted
Scope X
References X
Definitions (X)
Requirements X
Inspection X see EN 764-4
Marking X
Guidelines for processing the Z
material etc. (welding, heat
treatment, forming, flame-cutting)
Restrictions on application Z
X = in all cases
(X) = if necessary
Z = the relevant guidelines for fabrication and the restrictions on application are, where necessary,
given in EN 12952-5
a If applicable by reference to a European Standard for pressure purposes.
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EN 12952-2:2011 (E)
3.6 Compliance and inspection documentation of materials
Manufacturers and stockists of materials for pressure parts including welding consumables shall follow the
requirements in accordance with EN 764-5. They shall provide sufficient evidence of their capability to deliver
materials with consistent quality in accordance with the specifications and EN 764-5.
4 Material for pressure parts
4.1 Materials covered by harmonized European product Standards for pressure purposes
4.1.1 Flat products, forgings, castings, tubes, fittings, flanges and valve bodies
The material shall be ordered and delivered in accordance with Annex A and the relevant European
Standards EN 10028-2:2009, EN 10028-3:2009, EN 10028-7:2007, EN 10213:2007,
EN 10216-2:2002+A2:2007, EN 10216-3:2002, EN 10216-5:2004, EN 10217-2:2002, EN 10217-3:2002,
EN 10217-7:2005, EN 10222-2:1999, EN 10222-5:1999, EN 10253-2:2007, EN 10254:1999 and
EN 10273:2007. The additional requirements given in this clause shall be taken into account. Harmonized
supporting standards are EN 1092-1:2007, EN 1503-1:2000, EN 1503-2:2000, EN 1759-1:2004.
In case EN 12952-3:2011 requires Z35 quality in 10.3.1 for flat ends machined from a plate, this should be
determined in accordance with EN 10164:2004.
4.1.2 Cast iron
Spheroidal graphite cast iron shall not be used in the construction of pressure parts, except for valves and
fittings as indicated in EN 12952-7:2002, within the design limits specified in EN 12952-3:2011. The use of
other types of cast iron is not permitted.
4.1.3 Studs, bolts and nuts
Requirements for studs, bolts and nuts shall be in accordance with EN 10269:1999.
4.1.4 Welding consumables
The welding consumables (electrodes, filler wires, filler rods, fluxes, fusible inserts) shall be selected so that
the mechanical properties of the weld metal are compatible with the relevant requirements of the base
materials.
The welding consumables are classified or specified, respectively, in accordance with the following
standards: EN 757:1997, EN 760:1996, EN 1600:1997, EN 12074:2000, EN 12536:2000, EN 13479:2004,
EN ISO 544:2011, EN ISO 636:2008, EN ISO 2560:2009, EN ISO 3580:2011, EN ISO 14171:2010,
prEN ISO 14174:2010, EN ISO 14341:2008, EN ISO 14343:2009, EN ISO 14344:2010, EN ISO 16834:2007,
EN ISO 17632:2008, EN ISO 17633:2006, EN ISO 17634:2006, EN ISO 18276:2006, EN ISO 21952:2007,
EN ISO 24598:2007, EN ISO 26304:2009, ISO 3581:2003, ISO 18275:2011.
Technical delivery conditions for welding consumables and additives used for welding of pressure parts and
their structural attachments shall comply with EN 12074:2000 or EN ISO 544:2011.
NOTE Equivalent national/international provisions are admissible, provided they meet the same criteria concerning
the requirements for the manufacturing, delivery, distribution, test procedures and evaluation of welding consumables
and additives regarding the requirements for the quality management system.
4.1.5 Requirements for plates used for heads
Plates which are to be used in the manufacture of heads shall represent the quality class Z35 in accordance
with EN 10164:2004 (see EN 12952-3:2011, 10.3.1).
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EN 12952-2:2011 (E)
4.1.6 Requirements for non-destructive examination
The non-destructive examination (NDE) requirement for materials in the various product forms shall be as
given below.
a) plates:
Ultrasonic testing (UT) in accordance with EN 10160:1999, class S1.
b) tubes – seamless:
Seamless tubes shall be tested in accordance with EN 10216 (Series) test category 2 (TC2). For unalloyed
seamless tubes with design temperatures below 450 °C and design pressures below 42 bar, it is permitted to
perform test category 1 (TC1) in accordance with EN 10216-2:2002+A2:2007.
1) longitudinal imperfections:
UT in accordance with EN ISO 10893-10:2011
acceptance level: U2 sub-category B for cold finished and machined tubes
U2 sub-category C for all other conditions.
2) transverse imperfections:
acceptance level: U2 sub-category C for all headers with outside diameters > 142 mm.
3) tube ends:
UT in accordance with EN ISO 10893-10:2011, Annex B;
acceptance level: U2 sub-category B or C as for longitudinal imperfections.
NOTE This is only mandatory for fixed length tubes. When the tubes are in close end to end contact, it can be
accepted that 100 % (full length) ultrasonic examination has taken place, and therefore no additional tube end
examination is required.
c) tubes – welded:
Welded tubes of test category 2 (TC2) in accordance with EN 10217-2:2002. For unalloyed welded steel
tubes with design temperatures below 450 °C and design pressures below 42 bar, it is permitted to perform
test category 1 (TC1) in accordance with EN 10217-2:2002. However, the longitudinal weld shall be subject
to ultrasonic testing.
1) longitudinal imperfections:
acceptance level: U2 sub-category C.
2) transverse imperfections:
acceptance level: U2 sub-category C for all headers with outside diameter > 142 mm.
3) tube ends:
UT in accordance with EN ISO 10893-10:2011, Annex B
acceptance level: U2 sub-category C as for longitudinal imperfections.
NOTE This is only mandatory for fixed length tubes. When the tubes are in close end to end contact, it can be
assumed that 100 % (full length) ultrasonic testing has taken place, and therefore no additional tube end examination is
required. The requirements Annex I, 3.1.2 and 3.1.3 of Pressure Equipment Directive 97/23/EC should be taken into
account.
d) Forgings and rolled bars:
For pressure part of boilers, rolled bars in accordance with EN 10273:2007 as well as forgings shall be
examined according to EN 10222-2:1999, EN 10222-3:1998, EN 10222-4:1998 and EN 10222-5:1999 in
12
BS EN 12952-2:2011
EN 12952-2:2011 (E)
accordance with EN 10228-1:1999 up to EN 10228-3:1998. The volumetric testing in accordance with EN

10228-3:1998 shall be carried out in quality class 3 as 100 % examination with straight-beam probe scanning
and angle-beam probe scanning.
Steel die forgings for pressure parts of boilers shall be delivered as specified in EN 10254:1999. A volumetric
testing as a complete examination in quality class 3 of the forged or rolled stock for die forgings has to be
performed according to EN 10308:2001.
e) Steel castings:
Steel castings shall be delivered and tested in accordance with EN 10213:2007.
f) Butt-welding pipe fittings:
Butt-welding pipe fittings shall be tested in accordance with EN 10253-2:2007.
4.1.7 Inspection documents
The type of inspection document to be applied shall be as specified in EN 10204:2004.
NOTE Additional tests may be specified to cover additional or deviating requirements.
4.1.8 Marking
Marking shall be carried out in accordance with the requirements of EN 12952-5:2011, 6.3. For methods of
marking see European Standards for materials.
4.2 Material covered by European approvals of materials for pressure equipment –

technical requirements
4.2.1 General
The material shall be covered by a European approval of material (EAM) established in EN 764-4. This data
sheet shall meet the requirements in accordance with Table 3.5-1.
The non-destructive examination (NDE) requirement for materials in the various product forms according to
4.1.6 shall be specified as well for materials according to EN as for materials covered by European approvals
as for materials with particular material appraisal.
NOTE The term "cast", when related to chemical composition, is used in the same way as in all European base
materials standards and refers to the material in its molten condition.
4.2.2 Manufacture
If the properties specified can be reliably achieved only when special methods of manufacture are applied
(e.g. vacuum melting, treatment of the cast with nitrogen binding elements, or, in the case of welded tubes,
defined welding methods are applied), these methods shall be considered.
Rimming steels and semi-killed steels shall not be used.
4.2.3 Heat treatment condition
The heat treatment condition of the material at the time of delivery shall be specified.
NOTE Plates to be hot formed may be supplied in any suitable condition, e.g. as rolled, hot finished, normalized and
tempered.
13
BS EN 12952-2:2011
EN 12952-2:2011 (E)
Carbon and carbon manganese steel plates (Steel group 1, 2) to be cold formed shall be supplied in the
normalized condition.
Low alloy steel plates (Steel group 4, 5) to be cold formed shall be supplied in the normalized and tempered
condition except that, where metallurgically suitable and where post-welded heat treatment will suffice as the
tempering treatment, plates supplied in the normalized condition shall be permitted.
Electrically welded tubes shall be supplied in the normalized condition.
4.2.4 Chemical composition
The chemical composition for the cast analysis and for the product analysis shall be specified. For steels
intended for welding or forming, the values specified should not exceed the values given in Table 4.2-1.
Steels for which the values are higher than those given in Table 4.2-1 may be used subject to appropriate
welding approvals with appropriate heat treatment.
Table 4.2-1 — General requirements for the chemical composition of steels for welding and forming
Maximum content according to analysis

Steel
%C %P %S
cast product cast product cast product
Ferritic steels 0,23 0,25 0,035 0,040 0,020 0,025
Austenitic steels 0,10 0,11 0,035 0,040 0,015 0,018
Elements not specified in the EAM shall not be added intentionally, except for finishing the cast. All
reasonable precautions shall be taken to prevent the addition of elements from scrap or other materials used
in the manufacture, but residual elements may be present, provided the mechanical properties and
applicability are not adversely affected.
4.2.5 Mechanical and technological properties
4.2.5.1 General
The following property values shall be specified for each type of material, so that they reflect the specific
properties of the individual steel grade.
4.2.5.2 Tensile properties at room temperature
The tests shall be carried out in accordance with EN ISO 6892-1.
a) Yield or proof strength values
For all ferritic steels, the minimum value for the upper yield strength ReH, min or, for cases where no yield
phenomenon occurs, the minimum proof strength for 0,2 % non-proportional extension Rp0,2, min shall be
specified.
For austenitic steels, the minimum proof strength values for 1 % non-proportional extension Rp1,0, min and,
where appropriate, additionally Rp0,2, min values shall be specified.
b) Tensile strength
For the tensile strength, a minimum value Rm, min and, unless no maximum yield or proof strength value is
specified, a maximum value Rm, max shall be specified.
14
BS EN 12952-2:2011
EN 12952-2:2011 (E)
The specified minimum tensile strength shall be not less than 320 MPa. The specified maximum tensile
strength should not exceed the specified minimum tensile strength by more than
1) 120 MPa for carbon and carbon manganese steels;
2) 150 MPa for alloy steels, except austenitic steels;
3) 200 MPa for austenitic steels.
4.2.5.3 Elongation after fracture
The minimum percentage elongation after fracture Amin shall be specified for longitudinal and transverse
direction if possible. The gauge length shall be as recommended for the relevant product form and thickness
in EN ISO 6892-1. Transverse test specimens shall be taken where the form and thickness of the products
permit.
Steels shall have a specified minimum elongation after fracture measured on a gauge length L0 = 5,65 S0
(S0 = original cross sectional area within the gauge length) that is:
≥ 14 % for the transverse direction, or in those rare cases where it is the more critical direction, the
longitudinal direction
and
≥ 16 % for the longitudinal direction, or where this is the less critical direction, the transverse direction.
However, lower elongation values than specified in 4.2 (e.g. fasteners or castings) may also be applied,
provided that appropriate measures are proposed, discussed and agreed to compensate for these lower
values.
NOTE Examples for compensation:

– application of higher safety factors in design;
– performance of appropriate burst tests to demonstrate ductile material behaviour.
For gauge lengths other than L0 = 5,65 S0 the minimum value for elongation after fracture shall be
determined by conversion of the above specified values of 14 % and 16 % using the conversion tables given
 in EN ISO 2566-1 for carbon and low alloy steels;
 in EN ISO 2566-2 for austenitic steels.
4.2.5.4 Charpy V – notch impact energy
The tests shall be carried out with Charpy V-notch specimens in accordance with EN ISO 148-1. Transverse
specimens shall be used, if possible.
The specified average impact energy value obtained from a set of three specimens at a temperature not
greater than 20 °C but not higher than the lowest scheduled operating temperature shall be
 ≥ 27 J for transverse specimens, or
 ≥ 35 J for longitudinal specimens.
Only one individual value may be lower than the specified average value, but it shall not be less than 70 % of
the average value. The sequential test method in accordance with EN 10021 shall be applied.
15
BS EN 12952-2:2011
EN 12952-2:2011 (E)
4.2.5.5 Elevated temperature proof strength
The test shall be carried out in accordance with EN ISO 6892-2. For materials intended for the application at
temperatures above 50 °C,
 the minimum 0,2 % non-proportional proof strength values Rp0,2, min, or
 the minimum 1 % non-proportional proof strength values Rp1,0, min as defined in 4.2.5.2 a)
shall be specified, preferably for the following series of temperatures:
100 °C, 150 °C, 200 °C etc. up to the highest temperature for which proof strength values are used for the
design.
The minimum values specified for room temperature may be used for temperatures equal to or less than
50 °C.
For other than austenitic and austenitic-ferritic stainless steels, the specified value of ReH ( Rp0,2) at room
temperature (RT) may be used for temperatures less than or equal to 50 °C. Interpolation between 50 °C
and 100 °C shall be performed with the values of RT and 100 °C and using 20 °C as the starting point for
interpolation. Above 100 °C linear interpolation shall be performed between the tabulated values given in the
relevant material standard.
The specified minimum elevated temperature proof strength values shall be derived in accordance with
EN 10314.
4.2.5.6 Creep rupture strength
For materials intended for the application at temperatures in the creep range, the average stress rupture
values shall be specified in accordance with ISO 6303, taking into account the requirements of Annex B.
When only stress rupture values with extended time or stress extrapolation or such values derived from an
insufficient number of test results (see ISO 6303) are available, account of this shall be taken either by
increasing the safety factor or by shortened intervals between repeated inspections.
The material supplier shall provide the boiler manufacturer with a written statement declaring that the product
supplied complies with the specified properties and that the manufacturing processes have remained
equivalent to those for the steel from which the test results were obtained.
4.2.5.7 Technological properties
Where necessary, requirements for formability shall be specified e.g. on the basis of flattening or drift
expanding tests or on the basis of tests for the deformation properties perpendicular to the surface of the
product (see EN 10164) or requirements for other technological properties important for the processing or
use of the material.
4.2.5.8 Other properties
Where necessary, the requirements for properties other than those covered under 4.2.5.2 to 4.2.5.7 shall be
specified, e.g. requirements referring to the corrosion resistance of the material and the relevant verification
procedure.
4.2.5.9 Surface condition and internal soundness
The products shall be free from surface and internal imperfections which might impair their usability.
The requirements for non-destructive examination shall be the same as for the same type of products of a
comparable material listed in Annex A and as given in 4.1.6.
16
BS EN 12952-2:2011
EN 12952-2:2011 (E)
4.2.5.10 Dimensions and tolerance on dimensions, shape and weight
Dimensions and tolerances on dimensions, shape and weight shall, where possible, be specified by
reference to the appropriate dimensional standard.
4.2.5.11 Testing and inspection
For assessing the conformity of the delivered material with the requirements, the technical delivery
conditions shall specify the following:
a) the types of inspection documents (see Clause 6);
b) the properties to be verified (e.g. cast analysis, tensile properties);
c) the conditions applicable for specific inspection and testing (acceptance testing), namely:
1) the composition and maximum size of the test unit (e.g. the maximum weight or number of products
of the same cast, heat treatment batch) and
i) the numbers of sample products per test unit and;
ii) the number of samples per sample product;
to be taken and tested;
2) the location and direction of the test pieces in the product;
3) where necessary, the additional conditions for sampling and conditions for the preparation of the
samples and test pieces;
4) the European Standards in which the test methods are described;
5) the test repetitions to be carried out in accordance with EN 10021.
4.2.5.12 Marking
The technical delivery conditions shall specify, for the individual product forms, appropriate conditions for
marking and shall comply with 4.1.8.
4.2.5.13 Supplementary requirements
The water-tube boiler manufacturer shall specify any additional tests considered appropriate.
NOTE Where appropriate, the EAM should cover guidelines for processing the material and/or restrictions for the
application (see Table 3.5-1).
4.3 Materials with particular material appraisals
Particular material appraisals shall be applied for materials used in special cases not covered in 3.3.2 and
3.3.3 and not intended for frequent use. The materials shall be specified in a material specification and shall
be approved by an responsible authority in accordance with 3.3.4.
Where appropriate, the particular material appraisals shall, cover guidelines for processing the material. The
individual application for which the material is intended shall be clearly specified in the scope of the
respective material specification.
The non-destructive examination (NDE) requirement for materials in the various product forms according to
4.1.6 shall be specified as well for materials according to EN as for materials covered by European approvals
as for materials with particular material appraisal.
17
BS EN 12952-2:2011
EN 12952-2:2011 (E)
5 Materials for non-pressure parts

Materials for supporting lugs, fins, baffles and similar non-pressure parts welded to water-tube boiler
components shall be supplied to material specifications covering at least requirements for the chemical
composition and the tensile properties. Impact properties shall be specified when required by in-service
conditions. These materials shall be compatible with the material to which they are attached.
18
BS EN 12952-2:2011
EN 12952-2:2011 (E)
6 Inspection documentation
Inspections and tests shall be certified in accordance with EN 764-5:2002:
 with 2.2 test report in accordance with EN 10204:2004 for attachment materials;
 with 3.1 inspection certificate in accordance with EN 10204:2004 in the case of materials included in
European Standards ordered at manufacturers having a certified QM system, unless the purchaser
orders an inspection certificate of the type 3.2, which is the requirement for the direct inspection route in
accordance with EN 764-5:2002. The certificates shall contain information concerning the certification of
the material manufacturer’s quality system, the proof of applicability of the quality system to the
inspected material, the name of the competent body carrying out the quality system assessment, the
certificate number and expiry date;
 with the type of inspection document specified in the EAM in the case of new materials; with 3.2
inspection certificate in accordance with EN 10204:2004 in case of materials included in European
Standards ordered at manufacturers without a certified QM system;
 with test report 2.2 in accordance with EN 10204:2004 of welding consumables at least chemical
composition.
19
BS EN 12952-2:2011
EN 12952-2:2011 (E)
Annex A
(normative)
Materials covered by European material Standards
A.1 Pressure parts

Pressure parts of water-tube boilers covered by this European Standard shall be constructed from steel
products in accordance with Table A.1. Steel products shall be of the types listed in the European Standards,
see Clause 2, manufactured in accordance with these standards, and which comply in all respects with the
minimum requirements of this European Standard.
A.2 Fittings
Non-alloy and alloy steel butt-welding fittings shall be in accordance with EN 10253-2. Stainless steel butt-
welding fittings shall be in accordance with EN 10253-4 for application in the non creep range.
A.3 Flanges
Material grades for steel flanges in accordance with EN 1092-1 and EN 1759-1 shall be as listed in
Table A.1.
A.4 Valves
Metal valves for use in flanged tubing systems shall be in accordance with EN 1503-1 or EN 1503-2.
20
EN 12952-2:2011 (E)
Table A.1 — Steels provided for elevated temperature use (assorted according to EN standards for product forms)
a
Serial Product form EN standard Material description Grade Material Heat Thickness Material
No. No. treatment group to
d mm
CEN
min. max. ISO/TR
15608:2005
1 plate and strip EN 10028-2 Elevated temperature properties P235GH 1.0345 N 0 150 1.1
5 plate and strip EN 10028-2 Elevated temperature properties 16Mo3 1.5415 N 0 150 1.1
6 plate and strip EN 10028-2 Elevated temperature properties 18MnMo4-5 1.5414 NT 0 150 1.2
7 plate and strip EN 10028-2 Elevated temperature properties 20MnMoNi4-5 1.6311 QT 0 250 4.1
8 plate and strip EN 10028-2 Elevated temperature properties 15NiCuMoNb5-6-4 1.6368 NT 0 100 4.2
9 NT, QT 100 150
10 QT 150 200
11 plate and strip EN 10028-2 Elevated temperature properties 13CrMo4-5 1.7335 NT 0 100 5.1
12 NT, QT 100 150
13 QT 150 250
14 plate and strip EN 10028-2 Elevated temperature properties 12CrMo9-10 1.7375 NT, QT 0 250 5.2
21
EN 12952-2:2011 (E)
Table A.1 (continued)
a
d mm
CEN
min. max. ISO/TR
15608:2005
15 plate and strip EN 10028-2 Elevated temperature properties 10CrMo9-10 1.7380 NT 0 60 5.2
16 NT, QT 60 100
17 QT 100 250
18 plate and strip EN 10028-2 Elevated temperature properties X10CrMoVNb9-1 1.4903 NT 0 150 6.4
19 QT 150 250
20 plate and strip EN 10028-3 Fine grain steel P275NH 1.0487 N 0 150 1.1
23 plate and strip EN 10028-7 austenitic, elevated temperature X6CrNiTiB18-10 1.4941 AT 0 75 8.1
properties
24 plate and strip EN 10028-7 austenitic, elevated temperature X6CrNi18-10 1.4948 AT 0 75 8.1
properties
properties
properties
27 plate and strip EN 10028-7 austenitic, elevated temperature X5NiCrAlTi31-20 1.4958 AT 0 75 8.2
properties
28 plate and strip EN 10028-7 austenitic, elevated temperature X5NiCrAlTi31-20 (+RA) 1.4958 AT+RA 0 75 8.2
properties (+RA)
22
EN 12952-2:2011 (E)
a
d mm
CEN
min. max. ISO/TR
15608:2005
29 plate and strip EN 10028-7 austenitic, elevated temperature X8NiCrAlTi32-21 1.4959 AT 0 75 8.2
properties
30 plate and strip EN 10028-7 austenitic, elevated temperature X3CrNiMoBN17-13-3 1.4910 AT 0 75 8.1
properties
31 plate and strip EN 10028-7 austenitic, elevated temperature X8CrNiNb16-13 1.4961 AT 0 75 8.2
properties
32 tube, seamless EN 10216-2 elevated temperature properties P195GH 1.0348 N 0 16 1.1
35 tube, seamless EN 10216-2 elevated temperature properties 16Mo3 1.5415 N 0 60 1.1

a
36 tube, seamless EN 10216-2 elevated temperature properties 14MoV6-3 1.7715 NT 0 60 6.1
b
37 tube, seamless EN 10216-2 elevated temperature properties 10CrMo5-5 1.7338 NT 0 60 5.1
b
b
39 tube, seamless EN 10216-2 elevated temperature properties 8MoB5-4 1.5450 N 0 16 1.3
b
23
EN 12952-2:2011 (E)
a
d mm
CEN ISO/TR
min. max. 15608:2005
b
41 tube, seamless EN 10216-2 elevated temperature properties 7CrWVMoNb9-6 1.8201 NT 0 60 6.2
c
42 tube, seamless EN 10216-2 elevated temperature properties 7CrMoVTiB10-10 1.7378 NT 0 60 6.2
43 tube, seamless EN 10216-2 elevated temperature properties 11CrMo9-10 1.7383 QT 0 60 5.2

b
44 tube, seamless EN 10216-2 elevated temperature properties 15NiCuMoNb5-6-4 1.6368 NT 0 80 4.2
b
45 tube, seamless EN 10216-2 elevated temperature properties X10CrMoVNb9-1 1.4903 NT 0 120 6.4
b
46 tube, seamless EN 10216-2 elevated temperature properties X10CrWMoVNb9-2 1.4901 NT 0 120 6.4
b
47 tube, seamless EN 10216-2 elevated temperature properties X11CrMoWVNb9-1-1 1.4905 NT 0 120 6.4
b
48 tube, seamless EN 10216-2 elevated temperature properties X20CrMoV11-1 1.4922 NT 0 80 6.4
49 tube, seamless EN 10216-3 fine grain normalised P355NH 1.0565 N 0 100 1.2
50 tube, seamless EN 10216-3 fine grain normalised P460NH 1.8935 N 0 100 1.3
51 tube, seamless EN 10216-5 austenitic, elevated temperature X7CrNiTiB18-10 1.4941 AT 0 60 8.1

properties
52 tube, seamless EN 10216-5 austenitic, elevated temperature X5NiCrAlTi31-20 1.4958 AT 0 60 8.2

properties
53 tube, seamless EN 10216-5 austenitic, elevated temperature X8NiCrAlTi32-21 1.4959 AT 0 60 8.2

properties
24
EN 12952-2:2011 (E)
a
d mm
CEN
min. max. ISO/TR
15608:2005
54 tube, seamless EN 10216-5 austenitic, elevated temperature X3CrNiMoBN17-13-3 1.4910 AT 0 60 8.1

properties
55 tube, seamless EN 10216-5 austenitic, elevated temperature X8CrNiNb16-13 1.4961 AT 0 60 8.1

properties
56 tube, seamless EN 10216-5 austenitic, elevated temperature X8CrNiMoVNb16-13 1.4988 AT 0 60 8.1

properties
57 tube, seamless EN 10216-5 austenitic, elevated temperature X8CrNiMoNb16-16 1.4981 AT 0 60 8.1

properties
58 tube, seamless EN 10216-5 austenitic, elevated temperature X10CrNiMoMnNbVB15- 1.4982 AT 0 60 8.1

properties 10-1
59 tube, welded EN 10217-2 elevated temperature properties P195GH 1.0348 N 0 16 1.1
62 tube, welded EN 10217-2 elevated temperature properties 16Mo3 1.5415 N 0 16 1.1
63 tube, welded EN 10217-3 fine grain steel, HFW P355 NH 1.0565 N 0 16 1.2
64 fine grain steel, SAW 0 40 1.2
65 tube, welded EN 10217-3 fine grain steel, HFW P460NH 1.8935 N 0 16 1.3
66 fine grain steel, SAW 0 40 1.3
25
EN 12952-2:2011 (E)
a
d mm
CEN ISO/TR
min. max. 15608:2005
67 tube, welded EN 10217-5 SAW, elevated temperature P235GH 1.0345 N 0 40 1.1

properties
68 tube, welded EN 10217-5 SAW, elevated temperature P265GH 1.0425 N 0 40 1.1

properties
69 tube, welded EN 10217-5 SAW, elevated temperature 16Mo3 1.5415 N 0 40 1.1

properties
70 forging EN 10222-2 elevated temperature properties P245GH 1.0352 A 0 35 1.1
71 N, NT, QT 35 160
72 forging EN 10222-2 elevated temperature properties P280GH 1.0426 N 0 35 1.2
73 NT, QT 35 160
74 forging EN 10222-2 elevated temperature properties P305GH 1.0436 N 0 35 1.2
75 NT 35 160
76 QT 0 70
77 forging EN 10222-2 elevated temperature properties 16Mo3 1.5415 N 0 35 1.1
78 QT 35 500
79 forging EN 10222-2 elevated temperature properties 13CrMo4-5 1.7335 NT 0 70 5.1
80 QT 70 500
26
EN 12952-2:2011 (E)
a
d mm
CEN
min. max. ISO/TR
15608:2005
81 forging EN 10222-2 elevated temperature properties 15MnMoV4-5 1.5402 NT, QT 0 250 1.2
82 forging EN 10222-2 elevated temperature properties 18MnMoNi5-5 1.6308 QT 0 200 4.1
83 forging EN 10222-2 elevated temperature properties 14MoV6-3 1.7715 NT, QT 0 500 6.1
84 forging EN 10222-2 elevated temperature properties 15MnCrMoNiV5-3 1.6920 NT, QT 0 100 4.1
85 forging EN 10222-2 elevated temperature properties 11CrMo9-10 1.7383 NT 0 200 5.2
86 NT, QT 200 500
87 forging EN 10222-2 elevated temperature properties X10CrMoVNb9-1 1.4903 NT 0 130 6.4
88 forging EN 10222-2 elevated temperature properties X20CrMoV11-1 1.4922 QT 0 330 6.4
89 forging EN 10222-4 fine grain steel, high proof strength P285NH 1.0477 N 0 100 1.2
90 forging EN 10222-4 fine grain steel, high proof strength P285QH 1.0478 QT 100 400 1.2
92 forging EN 10222-4 fine grain steel, high proof strength P355QH1 1.0571 QT 100 400 1.2
94 forging EN 10222-4 fine grain steel, high proof strength P420QH 1.8936 QT 100 400 1.3
27
EN 12952-2:2011 (E)
a
d mm
CEN ISO/TR
min. max. 15608:2005
95 forging EN 10222-5 austenitic, elevated temperature X6CrNiTiB18-10 1.4941 AT 0 450 8.1

properties
96 forging EN 10222-5 austenitic, elevated temperature X7CrNiNb18-10 1.4912 AT 0 450 8.1

properties
97 forging EN 10222-5 austenitic, elevated temperature X3CrNiMoBN17-13-3 1.4910 AT 0 75 8.1

properties
98 fittings EN 10253-2 elevated temperature properties P235GH 1.0345 N 0 60 1.1
99 fittings EN 10253-2 elevated temperature properties P265GH 1.0425 N 0 60 1.1
100 fittings EN 10253-2 elevated temperature properties 16Mo3 1.5415 N 0 60 1.1

b
101 fittings EN 10253-2 elevated temperature properties 13CrMo4-5 1.7335 NT 0 60 5.1
b
102 fittings EN 10253-2 elevated temperature properties 10CrMo9-10 1.7380 NT 0 60 5.2
b
103 fittings EN 10253-2 elevated temperature properties X10CrMoVNb9-1 1.4903 NT 0 60 6.4
104 fittings EN 10253-2 elevated temperature properties P355N 1.0562 N 0 100 1.2
105 fittings EN 10253-2 elevated temperature properties P355NH 1.0565 N 0 100 1.2
28
EN 12952-2:2011 (E)
a
d mm
CEN
min. max. ISO/TR
15608:2005
106 fasteners EN 10269 elevated temperature properties 20Mn5 1.1133 N 0 150 1.4
107 fasteners EN 10269 elevated temperature properties 25CrMo4 1.7218 QT 0 150 5.1
108 fasteners EN 10269 elevated temperature properties 21CrMoV5-7 1.7709 QT 0 160 6.2
109 fasteners EN 10269 elevated temperature properties 20CrMoVTiB4-10 1.7729 QT 0 160 6.1
110 fasteners EN 10269 martensitic, elevated temperature X22CrMoV12-1 1.4923 QT 0 160 6.4
properties
111 fasteners EN 10269 austenitic, elevated temperature X6CrNi18-10 1.4948 AT 0 160 8.1
properties
112 fasteners EN 10269 austenitic, elevated temperature X10CrNiMoMnNbVB15- 1.4982 AT+WW 0 100 8.1
properties 10-1
113 fasteners EN 10269 austenitic, elevated temperature X3CrNiMoBN17-13-3 1.4910 AT 0 160 8.1
properties
114 fasteners EN 10269 austenitic, elevated temperature X6CrNiMoB17-12-2 1.4919 AT 0 160 8.1
properties
115 fasteners EN 10269 austenitic, elevated temperature X6CrNiTiB18-10 1.4941 AT 0 160 8.1
properties
116 fasteners EN 10269 austenitic, elevated temperature X6NiCrTiMoVB25-15-2 1.4980 AT+P 0 160 8.2
properties
117 fasteners EN 10269 austenitic, elevated temperature X7CrNiMoBNb16-16 1.4986 WW+P 0 100 8.1
properties
118 fasteners EN 10269 austenitic, elevated temperature NiCr15Fe7TiAl 2.4669 AT+P 0 25 43

properties
29
EN 12952-2:2011 (E)
a
d mm
CEN ISO/TR
min. max. 15608:2005
119 bar EN 10273 elevated temperature properties P235GH 1.0345 N 0 150 1.1
122 bar EN 10273 elevated temperature properties P275NH 1.0487 N 0 150 1.1
125 bar EN 10273 elevated temperature properties P355NH 1.0565 N 0 150 1.2
126 bar EN 10273 elevated temperature properties P355QH 1.8867 QT 0 150 1.2
127 bar EN 10273 elevated temperature properties 16Mo3 1.5415 N 0 220 1.1
128 bar EN 10273 elevated temperature properties 13CrMo4-5 1.7335 NT 0 60 5.1
129 NT, QA, QL 60 100
130 QL 100 150
131 bar EN 10273 elevated temperature properties 10CrMo9-10 1.7380 NT, QA, QL 0 60 5.2
132 QL 60 100
a
Relevant thickness for forgings: tR
b
It can be necessary according to the manufacturer, that these bars shall be quenched and tempered over 25 mm or T/D > 0,15; if so, „+QT“ shall be added.
c
It can be necessary according to the manufacturer, that these bars shall be quenched and tempered over 16 mm or T/D > 0,15; if so, „+QT“ shall be added.
d
Heat treatment:
A = annealed N = normalised P = precipitation hardened T = tempered
AT = solution annealed NT = normalised and tempered QA = quenched and annealed QL = liquid quenched
QT = quenched and tempered RA = recrystallizing annealed condition WW = warm worked
30
BS EN 12952-2:2011
EN 12952-2:2011 (E)
Annex B
(normative)
Establishment of creep rupture strength values for new materials
The establishment of creep rupture strength values for new materials shall be done in two steps as described
in Table B.1.
Table B.1 — Establishment of creep rupture strength values
Available Test Data Procedure for evaluation Further tests

First step Creep tests (3 samples For scatter bands not greater From each manufacturer
each) for 3 casts at min. 2 than ± 10 % extrapolation creep tests for (min. 5
for preliminary
test temperatures (∆t = factor < 3 for time. samples) min. 1 cast with
data in data
50 °C – 100 °C) for more min. 2 test temperatures for
sheets (EAS) Max. application temperature
than 10 000 h (rupture). more than 30 000 h
≤ max. test temperature. (rupture).
where embrittlement may
For scatter bands greater Where necessary for each
occur, for each cast and
than ± 10 % no extrapolated test temperature min. 2
temperature 1 notched
values in data sheets. In this notched samples for more
sample for more than
case the calculation values than 30 000 h (rupture).
10 000 h (rupture).
shall be defined in each
case.
Second step Creep tests (min., 5 For scatter bands not greater New manufacturers of such
samples each) for min. 6 than ± 20 % extrapolation materials shall test samples
for final data in
casts at test temperatures factor < 3 for time. at least at one test
data sheets
with ∆t ≤ 50 °C up to 35 % temperature for more than
(EAM) Max. application temperature
max. intended operating 30 000 h (rupture).
≤ 25 °C above max. test
time.
temperature. In the case of extension of
where necessary for the application range of the
notched creep tests (min. 2 data sheet creep tests
samples) at min. 2 (min. 5 samples each) for
temperatures in one cast at min. 2 test
embrittlement range up to temperatures more than
more than 30 000 h 30 000 h (rupture).
(rupture).
31
BS EN 12952-2:2011
EN 12952-2:2011 (E)
Annex C
(normative)
Special requirements for composite tubes
C.1 General
This annex gives the special requirements applicable to the properties of composite tubes used for pressure
parts in boilers with severe corrosion conditions.
C.2 Special requirements for composite tubing
C.2.1 Composite tubing
Composite tube consists of ferritic pressure retaining inner core and corrosion resistant outer cladding
metallurgically bonded to each other.
C.2.2 General
Material manufactured in accordance with this annex shall conform to the applicable requirements of the
current edition of the documents listed in 3.3 unless otherwise provided herein.
The composite tube shall be seamless tube manufactured by the hot extrusion process or hot extrusion
followed by cold working. A billet with the two component materials shall be co-extruded at high temperature
and high pressure in order to obtain a complete metallurgical bond.
All tube shall be furnished in the heat-treated condition. The heat treatment shall be performed at the
temperature suitable for the two components to obtain optimum mechanical and corrosion properties.
The finished tubes shall be straight, see C.2.5.2 and free from injurious imperfections.
C.2.3 Chemical composition
The chemical composition shall be in accordance with 3.3.
C.2.4 Mechanical and technological properties
C.2.4.1 Tensile test of ferritic pressure retaining inner core
The tensile test shall be performed on a number of tubes in accordance with C.2.9 (random lengths). The
mechanical properties shall conform to the values given in the specification selected in accordance with 3.3.
C.2.4.2 Ring expanding test (composite tube)
One ring expanding test shall be carried out on a specimen from each end of each tube (random lengths). The
ring shall be expanded to a minimum of 30 % of inside diameter or to rupture, if this should occur earlier. The
sample shall be free from imperfections as determined by visual inspection. The test shall be performed in
accordance with EN ISO 8495.
32
BS EN 12952-2:2011
EN 12952-2:2011 (E)
C.2.5 Tolerances
C.2.5.1 Permissible variations in OD and wall thickness
Outside diameter: ± 0,5 %, but with a minimum ± 0,30 mm

Total wall thickness: outside diameter < 50,8 mm + 22 % − 0
outside diameter ≥ 50,8 mm + 15 % − 0
Thickness of stainless steel component: ± 0,40 mm
The thickness of the stainless steel component shall be checked by eddy current testing over the whole length
of each tube.
Other tolerances may also be used upon agreement.
C.2.5.2 Permissible variations in straightness
Out of straightness max. 1,5 mm/1 000 mm.
C.2.6 Surface finish
The tubes shall be pickled free from scale.
C.2.7 Ultrasonic testing
C.2.7.1 Ultrasonic testing of the metallurgical bond in composite tubes
C.2.7.1.1 Extent of testing
The test procedure shall provide complete testing of the entire volume.
C.2.7.1.2 Reference standard
The reference standard shall be prepared from a length of tube of the same nominal dimensions, material,
surface finish and nominal heat treatment as the tubes to be tested.
A flat bottom hole 5 mm in diameter shall be introduced radially from the bore surface of the tube. The bottom
of the hole shall be positioned at the interface of the two materials. The flat bottom hole together with a
chosen combination of probe beam width or diameter, scan pitch and speed shall produce unambiguously at
least one signal at the ultrasonic testing apparatus corresponding to instantaneous detection of the bottom
area of the flat bottom hole. This shall be the reference signal. The equipment shall be adjusted to produce a
clearly identifiable reference signal pattern from the flat bottom hole. The amplitude of the reference signal
from the flat bottom hole shall be used to set the visual standard on the cathode ray screen or the threshold in
the electronic monitoring equipment.
C.2.7.1.3 Acceptance criteria
Any tube that does not produce a signal greater than the signal from the reference standard should be
deemed to have passed the test. Tubes with imperfections which produce a signal greater than that from the
reference standard shall be rejected.
On rejected tubes, the part with defective bonding shall be cropped off and the remaining part (parts)
considered accepted.
33
BS EN 12952-2:2011
EN 12952-2:2011 (E)
C.2.7.2 Ultrasonic testing of composite tubes concerning longitudinal and transverse imperfections
C.2.7.2.1 Method of testing
Immersion testing will be used. The scanning will be conducted using shear waves (approximately 45°
refraction of the sound beam). For the longitudinal scanning the beams will be directed in two opposite
circumferential directions and for the transversal scanning the beams will be directed in two opposite axial
directions.
C.2.7.2.2 Reference standard
The reference standard shall be prepared from a length of tube of the same nominal dimensions, material,
surface finish and nominal heat treatment as the tubes to be tested. On the outside and inside surface,
artificial notches shall be machined along the same line and with the dimensions and profile given in the
Table C.1. The dimensions and the profile shall be checked by the plastic replica technique.
Table C.1 — Artificial notches
Type Location Nominal depth Length Profile

mm mm
Longitudinal Inside 5 % of the total
nominal wall
Longitudinal Outside thickness, but 25 U-shape
Transverse Inside minimum 0,20 mm
Transverse Outside Tolerance: ± 10 %
C.2.7.2.3 Calibration
For calibration purposes the reference standard shall be passed through the scanning head at the same rate
and in the same directions as the tube to be tested.
C.2.8 Thickness check of stainless steel component
C.2.8.1 General
The measuring shall be carried out with an eddy current instrument intended for measuring the thickness of
non-metallic or non-magnetic layers on a ferromagnetic material.
C.2.8.2 Calibration
For the calibration two composite-tube pieces shall be used, one with a thickness of the stainless steel
component as near the minimum tolerance limit and the other as near to the maximum tolerance limit as
possible.
C.2.8.3 Acceptance criteria
Any tube that does not produce a signal outside the specified austenitic layer tolerances should be deemed to
have passed the test.
Tubes with the austenitic layer outside the tolerances shall be rejected.
On rejected tubes, the part outside the tolerances shall be cropped off and the remaining part (parts)
considered accepted.
34
BS EN 12952-2:2011
EN 12952-2:2011 (E)
C.2.9 Summary of tests and examinations
The tests and examinations shall be in accordance with Table C.2.
Table C.2 — Extent of tests and examinations
Test Extent
Cast analysis 1 per heat
Tensile test at room temperature (carbon 2 per lot of 2 to 15 tubes
steel component only)
3 per lot of 16 to 50 tubes
4 per lot of 51 to 100 tubes
6 per lot of ≥ 101 tubes
(random lengths)
Ring expanding test Each tube, both ends
(random lengths)
Ultrasonic test a Each tube (random lengths)
Thickness control of stainless steel Each tube (random lengths)
Dimensional check Each tube, both ends
Visual inspection Each tube, inside and outside
a Ultrasonic test according to C.2.7.2 is replacing leak tightness test (hydrostatic test or electromagnetic
test) as required according to EN 10216-2:2002+A2:2007.
C.3 Marking
C.3.1 General
Tubes shall be longitudinally marked with black ink along their entire length and marked in accordance with
4.1.8.
C.3.2 Additional marking requirements
The following additional marking shall be made:
 steel grade or material grade or material number of both components;
 the cast number of both components;
 outside diameter and wall thickness.
35
BS EN 12952-2:2011
EN 12952-2:2011 (E)
Annex D
(informative)
Significant technical changes between this European Standard and the

previous edition
Clause/Paragraph/Table/Figure Change
General Numbering system of tables and drawings has changed.
 Alignment of materials to valid standards.

General
 Further material grades (including austenitic steels) incorporated.
2 / Normative references References updated.
4.1.4 / Welding consumables  Referenced standards for classification of consumables updated.
 Requirements modified.
4.1.6 d) / Requirement for non- Requirements enlarged to rolled bars.

destructive examination –
forgings and rolled bars
4.1.6 f) / Requirement for non- Requirements for butt-welding pipe fittings added.
destructive examination – butt-
welding pipe fittings
Table 4.2-1 / General Max. S-content specified on lower level.

requirements for the chemical
composition of steels for welding
and forming
4.2.5.5 / Elevated temperature Interpolation procedure for proof strength values clarified.
proof strength
6 / Inspection documentation Information concerning certification of manufacturers quality system

required.
Table A.1 / Steels provided for Material group classification according to CEN ISO/TR 15608:2005 was
elevated temperature use added.
Annex C / Special requirements Title revised.

for composite tubes
NOTE The technical changes referred include the significant technical changes from the EN revised but is not an
exhaustive list of all modifications from the previous version.
36
BS EN 12952-2:2011
EN 12952-2:2011 (E)
Annex ZA
(informative)
Relationship between this European Standard and the Essential

Requirements of Directive 97/23/EC
This European Standard has been prepared under a mandate given to CEN by the European Commission
and the European Free Trade Association to provide a means of conforming to Essential Requirements of the
New Approach Directive 97/23/EC.
Once this standard is cited in the Official Journal of the European Union under that Directive and has been
implemented as a national standard in at least one Member State, compliance with the Clauses of this
standard given in Table ZA.1 confers, within the limits of the scope of this standard, a presumption of
conformity with the corresponding Essential Requirements of that Directive and associated EFTA regulations.
Table ZA.1 — Correspondence between this European Standard and Directive 97/23/EC
Clauses of this Content Essential Safety Requirements

European Standard (ESRs) of Directive 97/23/EC,
Annex I
3.1, 3.3 Appropriate material properties 4.1, a
3.1, 3.2 Suitable for the processing procedures 4.1, d
st
4.1 Technical documentation – EN materials 4.2b, 1 indent
st
6 Certification – Supplier compliance with 4.3, 1 paragraph
specification
nd
6 Certification – Supplier specific product control 4.3, 2 paragraph
rd
6 Certification – Supplier quality assurance 4.3, 3 paragraph
WARNING — Other requirements and other EU Directives may be applicable to the product(s) falling within
the scope of this standard.
37
BS EN 12952-2:2011
EN 12952-2:2011 (E)
Bibliography
EN ISO/IEC 17021, Conformity assessment — Requirements for bodies providing audit and certification of
management systems (ISO/IEC 17021:2006)
EN ISO 9001, Quality management systems — Requirements (ISO 9001:2008)
38
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BS EN 12952-2:2011

BSI Standards Publication

Water-tube boilers and

EUROPEAN STANDARD EN 12952-2

ICS 27.040 Supersedes EN 12952-2:2001

Water-tube boilers and auxiliary installations - Part 2: Materials

This European Standard was approved by CEN on 25 June 2011.

EUROPEAN COMMITTEE FOR STANDARDIZATION

Management Centre: Avenue Marnix 17, B-1000 Brussels

This document supersedes EN 12952-2:2001.

 Part 2: Materials for pressure parts of boilers and accessories;

 Part 3: Design and calculation for pressure parts;

 Part 4: In-service boiler life expectancy calculations

 Part 5: Workmanship and construction of pressure parts of the boiler;

 Part 7: Requirements for equipment for the boiler;

 Part 10: Requirements for safeguards against excessive pressure;

 Part 13: Requirements for flue gas cleaning systems;

 Part 15: Acceptance tests;

NOTE 1 A Part 18 on operating instructions is currently in preparation.

 wrought seamless tubes;

 electrically welded tubes;

 submerged, plasma and TIG arc-welded tubes;

 seamless composite tubes.

EN 760:1996, Welding consumables — Fluxes for submerged arc welding — Classification

EN 764-5:2002, Pressure equipment — Part 5: Compliance and inspection documentation of materials

EN 10021, General technical delivery conditions for steel products

EN 10204:2004, Metallic products — Types of inspection documents

EN 10213:2007, Steel castings for pressure purposes

EN 10228-1:1999, Non-destructive testing of steel forgings — Part 1: Magnetic particle inspection

EN 10228-2:1998, Non-destructive testing of steel forgings — Part 2: Penetrant testing

EN 10228-3:1998, Non-destructive testing of steel forgings — Part 3: Ultrasonic testing of ferritic or

EN 10254:1999, Steel closed die forgings — General technical delivery conditions

EN 10308:2001, Non destructive testing — Ultrasonic testing of steel bars

EN ISO 8495, Metallic materials — Tube — Ring-expanding test (ISO 8495:1998)

3.1 Selection of materials with regard to service conditions

3.2 Selection of materials with regard to fabrication

3.3 Material specification

a) harmonized European material Standards;

b) European approval of material (EAM);

c) particular material appraisals.

3.3.2 European Standards

NOTE Materials in accordance with European Standards are given in Annex A.

3.3.3 European approvals for materials

3.3.4 Particular material appraisals

Particular material appraisals apply for individual cases as for example:

3.4 Consideration of special materials properties

NOTE Examples are the scaling or ageing behaviour of the material.

3.5 Contents of material specification

Table 3.5-1 — Content of specifications for materials for pressure parts

Clauses EN standards European material data Particular

3.6 Compliance and inspection documentation of materials

4 Material for pressure parts

4.1.2 Cast iron

4.1.3 Studs, bolts and nuts

4.1.4 Welding consumables

4.1.5 Requirements for plates used for heads

4.1.6 Requirements for non-destructive examination

Ultrasonic testing (UT) in accordance with EN 10160:1999, class S1.

d) Forgings and rolled bars: