Notice No.

1
Rules for the
Manufacture, Testing and
Certification of Materials,
July 2021
The status of this Rule set is amended as shown and is now to be read in conjunction with this and prior
Notices. Any corrigenda included in the Notice are effective immediately.

Please note that corrigenda amends to paragraphs, Tables and Figures are not shown in their entirety.

Issue date: November 2021

IACS/IMO
Amendments to Effective date implementation (if
applicable)
Chapter 1, Sections 4 & 6 1 January 2022 N/A

Chapter 3, Sections 6 & 11 1 January 2022 N/A

Chapter 4, Section 1 1 January 2022 N/A

Chapter 5, Section 1 1 January 2022 N/A

Chapter 10, Sections 6 & 7 1 January 2022 N/A

Chapter 11, Section 10 1 January 2022 N/A

Chapter 12, Section 5 1 January 2022 1 January 2022

Chapter 12, Section 7 1 January 2022 N/A

Chapter 13, Section 10 1 January 2022 N/A

Chapter 14, Section 3 1 January 2022 N/A

Chapter 15, Section 2 1 January 2022 N/A

 Chapter 1
General Requirements
■ Section 4
General requirements for manufacture

4.3 Heat treatment

4.3.2 Heat treatment is to be carried out in properly constructed furnaces which are efficiently maintained and have adequate
means for control and recording of temperature. The furnace dimensions are to be such as to allow the whole item to be uniformly
heated to the necessary temperature. In the case of very large components which require heat treatment, alternative methods will be
specially considered. Furnace temperature uniformity surveys to recognised standards (e.g. ASTM A991) shall be carried out at the
specified frequency.

■ Section 6
References

6.1 General

Table 1.6.1 List of National and International Standards (partly shown)

Rule Reference Standard

Chapter 1 General Requirements ASTM A991

Chapter 3 – Rolled Steel Plates, Strip, Sections and Bars ASTM E45
EN 10164
Chapter 4 – Steel Castings ISO 1161
ASTM A991
Chapter 5 – Steel Forgings ASTM E112
ASTM A991

Chapter 3
Rolled Steel Plates, Strip, Sections and Bars

■ Section 6
Carbon–manganese and nickel alloy steels for low temperature service

6.4 Mechanical tests

6.4.1 For plates, one tensile test specimens are is to be taken from both one ends of each piece. A piece is to be regarded as
the rolled product from a single slab or from a single ingot if this is rolled directly into plates.

■ Section 11
High strength steel for special marine applications

11.1 Goal-based framework

(Part only shown)

11.1.6 The list of performance requirements (PR) is as follows:
(a) The material shall have the mechanical properties, for Material Class (Special Application), as specified in Table 3.11.1
Essential mechanical properties for Material Class (Special Applications) 1 and 2, and any other project requirements.

1
(b) The material shall have the chemical composition, for the appropriate Material Class (Special Application 1 or 2), as
specified in Table 3.11.2, Chemical composition for Material Class (Special Applications) 1 and 2, and any other project
requirements.
(f) The weldability of the material shall be confirmed by either an evidence-based regime according to a recognised method, or
by a performance-based regime, agreed with LR:
(i) The maximum carbon equivalent value (CEV), when calculated using UK Defence Standards criteria, shall be 0,64 (for
thickness 6–30 mm) and 0,70 (for thickness 30.1–150 mm) as specified in Table 3.11.3, Carbon equivalent values for
Material Class Special Applications 1 and 2.
(ii) The maximum CEV values, when calculated using LR Rules, shall be as per the values of H55QT or H69QT (for
Material Class Special Applications 1 and 2 respectively), within Table 3.10.3 Maximum Ceq, CET and Pcm values.
(g) A typical tensile strength value will be in the range of 640-820 N/mm2, for Material Class Special Application 1.
(h) A typical tensile strength value will be in the range of 725-860 N/mm2, for Material Class Special Application 2.

Existing Table 3.11.1 has been deleted and replaced with below;

Table 3.11.1 Essential mechanical properties for Material Class Special Applications 1 and 2
Material Class Yield strength Elongation Charpy Charpy test Hardness value
(Special (or 0,2% proof (minimum) value temperature (HB)
Application) strength) J °C
(see Note 1) (minimum) % (minimum)
2
N/mm

High Strength 550 20 80 −80 207 - 248

Steel – Special
Application 1
High Strength
Steel – Special 690 18 80 −80
Application 2

For
thickness > 228 - 270
60 mm

70 −80
Note 1. In addition to the above performance requirements for essential mechanical properties (for Material
Class Special Applications 1 and 2), the following tables provide further details for tensile, hardness, and
Charpy impact requirements, should the LR accepted solution route be followed.

• Table 3.11.11 Tensile and hardness properties for High Strength Steel for Material Class Special
Applications 1 and 2

• Table 3.11.12 Charpy impact properties for High Strength Steel for Material Class Special Applications
1 and 2

Existing Table 3.11.2 has been deleted and replaced with below;

Table 3.11.2 Chemical composition for Material Class Special Applications 1 and 2
Material Class (Special Application)

High Strength Steel – High Strength Steel –

Special Application 1 Special Application 2
Material grade chemical
Element (%) by weight
composition
Plate Thickness (mm)
All thickness ranges
6 to 32 inclusive Over 32 to 76 Over 76 to 140
(see Note 1)
(see Note 5) (see Note 5) (see Note 5)
Carbon ≤0,18 0,10 – 0,18 0,14 – 0,20 0,14 – 0,20
Manganese 0,10–0,40 0,10 – 0,40 0,10 – 0,40 0,10 – 0,40
Aluminium (see Note 2) 0,015–0,060 0,015 – 0,060 0,015 – 0,060 0,015 – 0,060
Phosphorus (see Note 3) ≤0,015 0,015 0,015 0,015
Sulphur ≤0,008 0,004 0,004 0,004
Silicon 0,15–0,35 0,15 – 0,38 0,15 – 0,38 0,15 – 0,38
Nickel 2,25–3,25 2,25 – 3,50 2,75 – 3,50 3,00 – 3,50
2
 Chromium 1,00–1,80 1,00 – 1,80 1,40 – 1,80 1,50 – 1,90
Molybdenum 0,2–0,6 0,20 – 0,60 0,35 – 0,60 0,50 – 0,65
Nitrogen (see Note 2) ≤0,012 0,010 0,010 0,010
Residual elements
Titanium ≤0,020 0,02 0,02 0,02
Vanadium ≤0,020 0,03 0,03 0,03
Copper ≤0,20 0,25 0,25 0,25
Arsenic ≤0,03 0,025 0,025 0,025
Antimony ≤0,010 0,025 0,025 0,025
Lead ≤0,005 Not specified Not specified Not specified
Tin ≤0,02 0,030 0,030 0,030
Cobalt (see Note 4) ≤0,03 0,030 0,030 0,030
Note 1. The listed product percentage by weight values also apply to ladle percentage weight values,
with the exception of sulphur, where the maximum percentage weight value is ≤0,006.
Note 2. The steel is to be fully killed, using aluminium fine grain practice, with a minimum aluminium
content of 0,015 per cent and greater than twice the percentage nitrogen.
Note 3. Where plates are specified as subject to stress relief, the preferred maximum phosphorus content is
0,010 per cent and is not to exceed 0,012 per cent.
Note 4. For Naval submersible craft with nuclear propulsion, and where the project authority requires, each
cast is to be analysed for cobalt. Where the content exceeds 0,030 per cent, instructions are to be obtained
from the project authority before release of the product. For commercial submersible craft, there is no
requirement for cobalt content analysis.
Note 5. Single values are maximum percentages. These elements should not be added deliberately.

11.2 LR accepted solutions for high strength steel for special marine applications

11.2.5 The requirements presented herein represent an accepted material solution to meet the requirements of High Strength Steel
– Special Application 1 and Special Application 2, of which Q1(N) and HY100 (UK) grades of rolled plate is an are respective example
examples.

11.3 General requirements

11.3.3 Supplied High Strength Steel – Special Application 2 plate product is to be in the thickness range 6,00 mm to 140 mm.

11.4 Manufacture and chemical composition

11.4.1 All plate products are to be produced by LR approved steelmaking processes, and any specific requirements for casting
type (e.g. ingot casting or continuous casting) shall be specified by the project.
11.4.2 High Strength Steel – Special Application 1 Applications has strict chemical composition ranges and limits for feedstock
(‘ladle’) and rolled product. These are indicated in Table 3.11.2 Chemical composition for Material Class (Special Applications) 1 and
2. Each cast is to be analysed using ladle samples. For product analysis, test samples are to be taken from mid-thickness at the top
centre portion of each plate, as shown in Figure 3.11.1 Location of test pieces for mechanical testing, chemical analysis and
metallography.

11.4.3 Carbon equivalent is to be calculated using the following formula, and the results compliant with the values listed in Table
3.11.3 Carbon equivalent values for Material Class Special Applications 1 and 2:

Mn Ni Cr Mo Si V
CEV = C+ + + + + +
6 40 5 4 24 15

Note. This CEV formula is only to be used for High Strength Steel – Special Application class steels. Other references to CEV
formulae within LR Rules are not applicable to High Strength Steel – Special Application class steels. Similarly, this formula shall not
be used to determine CEV for any other steel or product contained in other Rules, Chapters or Sections not related specifically to
High Strength Steel – Special Application 1 or Special Application 2 class steel.

3
Existing Table 3.11.3 has been deleted and replaced with below;

Table 3.11.3 Carbon equivalent values for Material Class Special Applications 1 and 2
High Strength Steel – High Strength Steel –
Special Application 1 Special Application 2

Carbon equivalent values Plate thickness Carbon equivalent values

Plate thickness (mm)
(mm)
Target Maximum

6 – 30 mm 0,62 0,64 All thickness 0,75 max

ranges
30,1 – 150 mm 0,66 0,70

11.5 Heat treatment

11.5.1 High Strength Steel – Special Application 1 plates Plates are to be supplied in the quenched and tempered condition. with
the following specific requirements:
(a) For Special Application 1, The the plates shall be hardened by heating above the upper critical temperature, but not to more
than 950°C, followed by water spray quenching. Subsequent quenching shall be in the range 600°C to 675°C. Heat treatment
records are to be supplied for each batch. Pickling or flame descaling is not permitted after heat treatment.
(b) For Special Application 2, the manufacturer may determine the detailed procedure to produce plates meeting the mechanical
property requirements with the exception that the final tempering temperature is to be in the range 660°C to 680°C. Plates, after
receiving tempering and heat treatment, shall be cooled at a rate equal to or faster than air cooling.

11.6 Cleanliness

11.6.2 Material is to exhibit homogeneous microstructure throughout the section thickness and be free from macro segregation.

11.7 Dimensions, flatness, thickness and weight control

11.7.1 Plates are to be supplied to nominal dimensions as required in Table 3.11.5 Dimensional tolerances for Material Class
Special Applications 1 and 2.

Existing Table 3.11.5 has been deleted and replaced with below;

Table 3.11.5 Dimensional tolerances for Material Class Special Applications 1 and 2
Tolerance on length and width of plate for Special application 1
Length of plate Tolerance

Minus Plus
Up to and including 3000 mm 0 13 mm
Over 3000 mm up to and including 6000 mm 0 25 mm
Over 6000 mm 0 32 mm
Tolerance on length and width of plate for Special application 2
Thickness of plate Tolerance
Minus Plus
Up to and including 51 mm 6 mm 19 mm
Over 51 mm thick up to and including 102 mm 6 mm 25 mm
Over 102 mm 6 mm 29 mm

11.7.2 Plates are to comply with the flatness tolerances in Table 3.11.6 Flatness tolerance for plate and measurement information
for Special Application 1 and Table 3.11.7 Flatness tolerance for plate and measurement information for Special Application 2.

(Table not shown as no technical amendments have been made)

Table 3.11.6 Flatness tolerance for plate and measurement information for Special Application 1

4
Table 3.11.7 Flatness tolerance for plate and measurement information for Special Application 2

Flatness Tolerances for specified widths (mm) (see Notes 1, 2 and 3)

Thickness (mm) 1,200 1,500 1,800 2,100 2,400 2,700 3,000

Up to 900 to Over
to to to to to to to
900 1,200 3,600
1,500 1,800 2,100 2,400 2,700 3,000 3,600

6 to 10 19 24 29 35 44 48 51 57 60 -

Over 10 up to 13 19 22 24 24 29 33 38 41 48 70

Over 13 up to 19 16 19 22 22 25 29 32 35 41 57

Over 19 up to 25 16 19 22 22 24 25 29 33 38 51

Over 25 up to 51 14 16 19 21 22 24 25 25 25 41

Over 51 up to 102 13 14 18 19 19 19 19 22 25 32

Over 102 up to 140 14 18 19 19 22 22 24 29 32 32

The flatness as specified in the table is to be an overall flatness factor. This
factor is not to apply to 'kinks' or 'waviness'. The waviness or kinking permitted
Measurement is to be evaluated by laying a one metre straight edge across the affected
edges. The maximum permissible deviation from the straight edge is 6,5 mm.

Note 1. Flatness tolerances for length and width. The longer dimension specified is considered the length and variations
from a flat surface along the length are not to exceed the tabular amount for the specified width in any 4,0 metres of
length.
Note 2. When the longer dimension is under 1 metre, the variation in flatness is not to exceed 6 mm.
Note 3. The above table and notes cover the flatness tolerances of circular and sketch plates, based on the maximum
dimensions of those plates.

11.7.3 All plates should shall be subject to thickness gauging and weight control. Conformance criteria are shown in Table 3.11.78
Tolerances for thickness and weight control for Special Application 1, and Table 3.11.9 Tolerances for thickness and weight control
for Special Application 2.

11.7.4 Thickness gauging may be taken by the use of calibrated mechanical or ultrasonic instruments, with the following grid
sections to be applied:
(a) For undressed plates, grid lines are to be marked 25 mm from each edge and end, thereafter at intervals of 600 mm x 600 mm
grid squares.
(b) For dressed areas, the grid size is reduced to 150 mm x 150 mm for plates up to and including 12 mm thick, and 300 mm x 300
mm for plates over 12 mm thick.

Table 3.11.78 Tolerances for thickness and weight control for Special Application 1
Tolerances
Maximum weight
Plate thickness Bulk orders Small
Item
(mm) Thickness
orders or
Individual
Batch individual
plates plates
A 6,1–12 +2% −7% +2% +0 +2%

B 12,1–25 +1% −3% +1% +0 +1%

C 25,1 and over +1% −3% +1% +0 0

Plates for insert Not Not Not
D pads +5% -0
applicable applicable applicable

5
Note 1. Thickness gauging is to be undertaken in accordance with specific project
requirements.

Note 1 2. Plates Where required by the project requirements, plates are to be weighed after
final heat treatment with any surface dressing and abrasive blasting completed. The
machine accuracy should be ±1,0 per cent of the nominal weight of subject plate.

Table 3.11.9 Tolerances for thickness and weight control for Special Application 2

Nominal Plate
Item Thickness Tolerance
Thickness (mm)

A 6 to 25 inclusive +0,75 mm - 0,25 mm

Over 25,1 up to and

B +3% - 0,25 mm
including 75

C Over 75 +2,25 mm - 0,25 mm

Note 1. Where required by the project requirements, plates are to be
weighed after final heat treatment with any necessary dressing of
the surface and abrasive blasting completed. The machine accuracy
should be ±1,0 per cent of the nominal weight of subject plate.

11.7.5 Weld repairs of plate defects are not permitted for either Special Application 1 or Special Application 2.

11.9 Mechanical tests

11.9.1 Sampling: Test specimens are to be taken from each finally heat-treated plate in accordance with Table 3.11.8 Mechanical
test samples. The locations of test samples for mechanical testing, chemical analysis and metallography are indicated in Figure
3.11.1 Location of test pieces for mechanical testing, chemical analysis and metallography. When required, through-thickness tensile
requirements (sampling, testing and acceptance criteria) are to be defined by the project requirements.

11.9.2 When required for Special Application 1, through thickness tensile requirements (sampling, testing and acceptance criteria)
are to be defined by the project requirements which should, as a minimum, conform to EN 10164, and quality class Z35. For Special
Application 2 through thickness tensile requirements are to be in accordance with Table 3.11.10 Mechanical test samples.

(Part only shown)

Table 3.11.810 Mechanical test samples
Dimensions Samples required
Tensile – as per Figure 3.11.1 Location of test pieces for mechanical testing,
chemical analysis and metallography.

Charpy – as per Figure 3.11.1 Location of test pieces for mechanical testing,
chemical analysis and metallography.

Plates over 3000 mm in length

Samples acquired from both plate ends.

Hardness – test at diagonally opposite corners.

Through thickness tensile (where required) - as per Figure 3.11.1 Location of

test pieces for mechanical testing, chemical analysis and metallography.
Tensile – as per Figure 3.11.1 Location of test pieces for mechanical testing,
chemical analysis and metallography.

Charpy – as per Figure 3.11.1 Location of test pieces for mechanical testing,
chemical analysis and metallography.
Plates under 3000 mm in length
Samples acquired from one plate end only.

Hardness – test at diagonally opposite corners.

6
 Through thickness tensile (where required) - as per Figure 3.11.1 Location of
test pieces for mechanical testing, chemical analysis and metallography.
a. For all plate material equal or greater than 30 mm thick, full thickness short
transverse tensile tests are to be taken from the first plate of the cast (top
end) to assess through thickness ductility (according to EN 10164).
b. Samples are to be taken from the positions shown in Figure 3.11.1
Location of test pieces for mechanical testing, chemical analysis and
Notes: Through thickness tensile metallography. For non-extension pieces these are to be as per EN 10164:
The test piece shall have the following diameter, do:
do = 6 mm or 10 mm for 20 ≤ t ≤ 40, where t is the plate thickness in
mm;
do = 10 mm for 40 < t ≤ 400, where t is the plate thickness in mm.

c. The acceptance criteria are to Quality Class Z35, as per EN 10164.

11.9.2 11.9.3 The results of mechanical tests shall comply with the appropriate requirements given in the following tables:
• Table 3.11.1 Essential mechanical properties for Material Class (Special Applications) 1 and 2
• Table 3.11.9 Mechanical properties for High Strength Steel – Special Application 1 Class steel.
• Table 3.11.11 Tensile and hardness properties for High Strength Steel for Material Class Special Applications 1 and 2
• Table 3.11.12 Charpy impact properties for High Strength Steel for Material Class Special Applications 1 and 2

Existing Table 3.11.9 has been deleted and replaced by Tables 3.11.11 and 3.11.12.

Table 3.11.11 Tensile and hardness properties for High Strength Steel for Material Class Special Applications 1 and 2

0,2% Proof
Material Thickness strength (N/mm2) Elongation % Reduction in area Hardness
Class (see Notes 1 and 2) % HB

Min Max Min Min Range

≤16 mm 550 690 20 - 207– 248

Special
Application 16,1 mm up to 55 – Longitudinal
1 150 mm 550 655 20 50 – Transverse 207–248

<19 mm 690 825 18 - 228– 270

(Note 3)

Special
Application
2 19 mm up to 690 825 18 45 – Transverse 228–270
140 mm (see Note
3)

Note 1. For High Strength Steel Special Application 1, the tensile strength is to be recorded and is to be such
that the ratio of 0,2% proof strength to tensile strength for all plate thickness is not to exceed 0,90.
Note 2. For High Strength Steel Special Application 2, the tensile strength is to be recorded and is to be such
that the ratio of 0,2% proof strength to tensile strength for plate thickness from 6 mm to less than 19 mm thick
is not to exceed 0,95, and for plate thickness 19 mm and above, the ratio is not to exceed 0,92.

7
 Note 3. If any result is outside the range 228 HB to 270 HB, the cause of the discrepancy between hardness
and the normally expected tensile strength shall be fully investigated by the steel mill before the plate can be
despatched from the steel mill. The project authority and LR shall be notified of the reasons for any
discrepancy between the hardness and expected tensile results and any ensuing mitigation actions.

Table 3.11.12 Charpy impact properties for High Strength Steel for Material Class Special Applications 1 and 2

Charpy value Charpy test

Material Class Thickness
J temperature
°C

80 (−80)
<12 mm

65 (−80)
for a 7,5 x 10 mm
sample

or; (−80)
Special Application 1
55
(5 mm x 10 mm
sample)

≥12 mm (see Note 80 (−80)

1)

<12 mm 65 (−80)
for a 7,5 x 10 mm
sample, or;
5 mm x 10 mm
sample

Special Application 2
12 mm up to 60 55 (−80)
mm (see Note 2) for a 10 x 10 mm
sample

>60 mm up to 140 70 (−80)

mm (see Note 3) for a 10 x 10 mm
sample
Note 1. The energy absorbed by each of the three test pieces (using a 10 x 10 mm sample) is to
be greater than 80 Joules
Note 2. The average energy absorption of the three test pieces (using a 10 x 10 mm sample) for
thicknesses up to 60 mm inclusive at each end of the plate is to be not less than 80 joules, and no
single specimen is to be less than 70 joules.
Note 3. For plates over 60 mm thick the average value is to be not less than 70 joules, and no
single value is to be less than 55 joules.

11.11 Additional approval testing

11.11.1 The project requirements may specify appropriate and additional specialised testing for manufacturer approval.

11.12 Visual and NDE requirements

8
11.12.2 Surface defects: Afterfinal After final heat treatment and abrasive blasting, e.g. shot blasting, each plate is to be examined
visually for surface defects discontinuities. Surface Any surface discontinuities shall be defined as imperfections or defects and will
are to comply with project specific acceptance criteria.

11.12.3 Internal defects: Examination for internal defects shall be carried out as required by the project specification and comply
with project-specific acceptance criteria. Where project requirements for examination of plates are not specified, LR requires
ultrasonic testing to be carried out, and the extent and acceptance criteria shall be agreed with LR.

Chapter 4
Steel Castings
■ Section 1
General requirements

1.5 Heat treatment

1.5.2 Heat treatment is to be carried out in a properly constructed furnace which is efficiently maintained and has adequate means
of temperature control. The furnace dimensions are to be such as to allow the steel castings to be uniformly heated to the necessary
temperature. Sufficient thermocouples are to be connected to the steel castings to show that their temperature is adequately uniform
and the temperatures are to be recorded throughout the heat treatment. Alternative procedures are to be approved by LR, Materials
and NDE department. The records are to identify the furnace that was used and give details of the individual steel castings, the heat
treatment temperature and time at temperature and the date. The Surveyor is to examine the charts and confirm the details on the
certificate. In the case of very large components which require heat treatment, alternative methods will be specially considered.

1.5.3 As an alternative procedure to the connection of thermocouples as required by Ch 4, 1.5 Heat treatment 1.5.2, temperature
uniformity surveys of the heat treatment furnace may be accepted subject to approval by LR, Materials and NDE department. An
initial temperature uniformity survey in the furnace fully loaded condition is required to be carried out in accordance with recognised
standards (e.g. ASTM A991). Regular temperature uniformity surveys are then subsequently required at a frequency of at least once
per year.

Existing paragraph 1.5.3 has been renumbered as 1.5.4.

Chapter 5
Steel Forgings
■ Section 1
General requirements

1.5 Heat treatment

1.5.2 Heat treatment is to be carried out in a properly constructed furnace which is efficiently maintained and has adequate means
of temperature control. The furnace dimensions are to be such as to allow all the steel forgings to be uniformly heated to the necessary
temperature. In the case of very large forgings, alternative methods of heat treatment will be specially considered. Sufficient
thermocouples are to be connected to the steel forging(s) in the furnace to show that the temperature is adequately uniform and the
temperatures are to be recorded throughout the heat treatment. Copies of these records are to be presented to the Surveyor together
with a sketch showing the positions at which the temperature measurements were carried out. The records are to identify the furnace
that was used and give details of the steel-making heat, the heat treatment temperature, time at temperature and the date. The
Surveyor is to examine the charts and confirm the details on the certificate. Alternative procedures are to be approved by LR’s
Materials and NDE Department.

1.5.3 As an alternative procedure to the connection of thermocouples as required by Ch 5, 1.5 Heat treatment 1.5.2, temperature
uniformity surveys of the heat treatment furnace may be accepted subject to approval by LR, Materials and NDE department. An
initial temperature uniformity survey in the furnace fully loaded condition is required to be carried out in accordance with recognised
standards (e.g. ASTM A991). Regular temperature uniformity surveys are then subsequently required at a frequency of at least once
per year.

Existing paragraph 1.5.3 has been renumbered as 1.5.4.

9
1.9 Rectification of defects

1.9.3 Repair welding is not permitted for crankshafts or similar rotating components forgings subject to torsional fatigue, such as
crankshafts and propeller shafts.

Chapter 10
Equipment for Mooring and Anchoring
■ Section 6
Steel wire ropes
6.7 Certification

6.7.1 Unless otherwise requested by the purchaser, a manufacturer’s certificate, in accordance with Ch 1, 3.1 General 3.1.3. (c),
is to be issued. Where specified in applicable LR Rules or Codes, an LR certificate or manufacturer’s certificate validated by LR, in
accordance with Ch 1, 3.1 General 3.1.3 (a) or Ch 1, 3.1 General 3.1.3 (b) respectively, is to be issued. Otherwise a manufacturer’s
certificate, in accordance with Ch 1, 3.1 General 3.1.3 (c), is to be issued and in such cases the certificate is to be validated by the
manufacturer’s authorised representative, independent of the manufacturing department.

■ Section 7
Fibre ropes
7.4 Certification

7.4.1 A manufacturer’s certificate, in accordance with Ch 1, 3.1 General 3.1.3.(c), is to be issued. The certificate is to be validated
by the manufacturer’s representative, who is to be independent of the production process and LR. Where specified in applicable LR
Rules or Codes, an LR certificate or manufacturer’s certificate validated by LR, in accordance with Ch 1, 3.1 General 3.1.3 (a) or Ch
1, 3.1 General 3.1.3 (b) respectively, is to be issued. Otherwise a manufacturer’s certificate, in accordance with Ch 1, 3.1 General
3.1.3 (c), is to be issued and in such cases the certificate is to be validated by the manufacturer’s authorised representative,
independent of the manufacturing department.

Chapter 11
Approval of Welding Consumables

■ Section 10
Consumables for high strength steel for special marine applications
10.1 Goal-based framework

(Part only shown)

10.1.6 The list of performance requirements (PR) is as follows:
(a) The mechanical properties of the weld metal shall comply with the consumable grade requirements stated in Table 11.10.1
Mechanical property requirements for deposited metal tests (manual, semi-automatic and automatic multi-run techniques) for
consumable grade and applicable Material Class (Special Applications) 1 and 2.
(e) The results of butt weld test assemblies are to comply with the requirements given in Table 11.10.2 Mechanical property
requirements for butt weld tests (all techniques) for consumable grade and applicable Material Class (Special Applications) 1
and 2).

Table 11.10.1 Mechanical property requirements for deposited metal tests (manual, semi-automatic and automatic multi-
run techniques), for consumable grade and applicable Material Class (Special Applications) 1 and 2
Consumable Material Class Yield Tensile Elongation on Charpy V-notch impact tests
grade (Special strength strength 50 mm % Test Individual
Application) N/mm2 N/mm2 minimum temperature energy value J
minimum °C minimum
HSS1 High Strength 550 640–820 18 −50 50
Steel – Special
Application 1

10
 HSS2 High Strength 565 640-820 18 −50 50
(Undermatched) Steel – Special
Application 2
(Undermatched
welds)
HSS2 High Strength 690 770-940 17 −50 50
(Matched) Steel – Special
Application 2
(Matched welds)

Table 11.10.2 Mechanical property requirements for butt weld tests (all techniques) for consumable grade and applicable
material classClass (Special Applications) 1 and 2
Consumable Material Class Tensile strength Bend test ratio: Charpy V-notch impact tests
Grade grade (Special N/mm2 D/t Test temperature Individual energy
Application) value J minimum
°C
HSS1 High Strength 640–820 5 -50 50
Steel – Special
Application 1
HSS2 High Strength 640–820 5 -50 50
(Undermatched) Steel – Special
Application 2
(Undermatched
weld)
HSS2 (Matched) High Strength 770 - 940 5 -50 50
Steel – Special
Application 2
(Matched weld)

10.2 LR accepted solutions for welding consumables for high strength steel for special marine applications

10.2.5 The requirements presented herein represent an accepted solution for LR certified welding consumables, for use with High
Strength Steel – Special Application 1 and Special Application 2, (high strength steel for special applications class 1) of which Q1(N)
and HY100 (UK) grade is an example of rolled plate are respective examples.

10.3 General requirements

10.3.4 Dependent on the results of mechanical and other tests, approval Approval will be granted by assigning the grade HSS1.,
HSS2 (Undermatched), or HSS2 (Matched), where the consumable achieves the required properties for each designated grade,
based on the project design and application requirements.

10.3.5 Steel plate material for test panels is to be the same as the intended application of material class, i.e. High Strength Steel –
Special Application 1, or High Strength Steel – Special Application 2.

10.3.6 Where the relevant Section requires deposited metal assemblies to be made and tested, the results of all tensile and notch
impact tests are to comply with the requirements given in Table 11.10.1 Mechanical property requirements for deposited metal tests
(manual, semi-automatic and automatic multi-run techniques) for consumable grade and applicable Material Class (Special
Applications) 1 and 2.

10.3.9 Where the relevant Section requires butt weld assemblies to be made and tested, the results of transverse tensile, notch
impact and bend tests are to comply with the requirements given in Table 11.10.2 Mechanical property requirements for butt weld
tests (all techniques) for consumable grade and applicable Material Class (Special Applications) 1 and 2, as appropriate. The position
of fracture from the transverse tensile test is to be reported.

10.4 Annual tests

10.4.2 The results are to comply with the requirements given in Table 11.10.1 Mechanical property requirements for deposited
metal tests (manual, semi-automatic and automatic multi-run techniques) for consumable grade and applicable Material Class
(Special Applications) 1 and 2 and Table 11.10.2 Mechanical property requirements for butt weld tests (all techniques) for consumable
grade and applicable Material Class (Special Applications) 1 and 2, as appropriate.

11
 Chapter 12
Welding Qualifications
■ Section 5
Welder Qualification Tests
5.1 Scope

5.1.6 Welder qualification tests made in accordance with EN, ISO, JIS, ASME or AWS may be considered for acceptance
provided that, as a minimum, they are equivalent to, and meet the technical intent of these Rules in terms of qualification
examination, testing, and range of approval to the satisfaction of the Surveyor. The extension of validity of welder qualifications shall
be in accordance with the requirements of Ch 12, 5.7 Welders qualification certification.

5.7 Welders qualification certification

5.7.4 The Surveyor shall extend the validity of the approval by one of the following methods:
(a) Re-test the welder every 3 years.
(b) After Every 2 years, two welds made within the previous six months are to be subject to radiographic inspection or ultrasonic
inspection or destructively tested and the result recorded. Welding shall reproduce all initial test conditions except for
thickness. Subject to satisfactory examination or testing the qualification is revalidated for a further 2 years. The Surveyor will
signify acceptance of the extension to the validity by endorsing the certificate.
(c) At intervals not exceeding 3 years, the quality aspects detailed in Ch 12, 5.7 Welder qualification tests 5.7.5 are to be
demonstrated by the manufacturer to the satisfaction of Surveyor. The Surveyor will signify acceptance of the extension of the
validity by endorsing the certificate. This method is not permitted for welder qualifications related to welding of pipes and
pressure vessels.

5.7.5 Quality aspects:

(a) The welder was qualified by the same manufacturer and is working under their direct control.
(b) The manufacturer is working in accordance with a quality management system specified in Ch 12, 5.7 Welder qualification
tests 5.7.6.
(c) The manufacturer has documented at least once a year that the welder has produced acceptable weld(s) meeting rule
requirements in the welding positions, weld types, welding processes and the backing conditions covered by the welder
certificate. Evidence should include NDE or destructive test results of welding.

5.7.6 For the extension of welder’s qualification validity permitted by the method detailed in Ch 12, 5.7 Welder qualification tests
5.7.4 (c), the manufacturer should have certification to a recognised quality management system under LR, or under an independent
body acceptable to LR, and include the following minimum requirements:
(a) A designated person is responsible for the coordination of the welder quality management system.
(b) A list of all welders, including their qualification status, and welding supervisors in the shipyard/manufacturer is maintained.
(c) A welder qualification certificate is issued to each qualified welder.
(d) Training requirements are specified for the welder qualification programme.
(e) An identification and traceability system is in place for welders and WPS used on production welds.
(f) A procedure is in place to monitor performance of each welder based on the results of weld examination records and the weld
repair rates. The procedure should also specify the criteria for the retesting of each welder based on the performance results.

Existing paragraphs 5.7.5 to 5.7.7 have been renumbered 5.7.7 to 5.7.9.

■ Section 7
Welding qualification requirements for high strength steel for special marine
applications
7.1 Goal-based framework

(Part only shown)

7.1.6 The list of performance requirements (PR) is as follows:
(a) For welding procedure qualification tests, the mechanical properties for category A and B welds shall comply with the
requirements stated in Table 12.7.1 Mechanical property acceptance requirements for butt welding in plate (in welds that form
part of the pressure hull boundary, and tensile loading under normal submarine operation) for applicable Material Class (Special
Applications) 1 and 2.
(b) When required by a specific project or specified testing regime, the surface crack extension from flawed bulge explosion
(FBE) tests is to be not greater than 50 mm. The presence and location of any laminar flaws are to be reported for special
consideration. Where indications of laminar flaws are detected within 10 mm of the tension surface, and they extend to within

12
 50 mm of the fatigue cracked notch, then there is the potential for them to have influenced the shock loading of the bulge
panel flaw. In such cases the FBE test is not considered valid.
(d) For welding procedure qualification tests, the mechanical properties for category C and D welds shall comply with the
requirements stated in Ch 12, 2 Welding procedure qualification tests for steels except that Charpy impact test minimum energy
requirements are to meet the requirements of Table 12.7.1 Mechanical property acceptance requirements for butt welding in
plate (in welds that form part of the pressure hull boundary, and tensile loading under normal submarine operation) for applicable
Material Class (Special Applications) 1 and 2.

Table 12.7.1 Mechanical property acceptance requirements for butt welding in plate (in welds that form part of the pressure
hull boundary, and tensile loading under normal submarine operation) for applicable Material Class (Special Applications)
1 and 2
Material Class Tensile test Charpy V-notch impact tests
(Special Yield Elongation (%) Test temperature Average absorbed Average shear
Application) strength (minimum) (°C) energy (J) fracture (%)
(MPa (minimum) Average Charpy
N/mm2) See Note 2 impact crystallinity (%)
See Note 1 (maximum)
See Note 3
High Strength Steel >550 >18 16 −50 >50 >45 55
– Special
Application 1
High Strength Steel >565 16 -50 50 55
– Special
Application 2
(undermatched
weld)
High Strength Steel >690 16 -50 50 55
– Special
Application 2
(Matched weld)
Note 1. The individual reduction of area and tensile strength values together with weld metal chemical analysis are recorded
for information only.
Note 2. No individual value may be less than 40 J.
Note 3. No individual value may be less greater than 30 70 per cent.

7.2 LR accepted solutions for welding qualifications for high strength steel for special marine applications

7.2.5 The requirements presented herein represent an accepted solution for welding qualifications, certified for use High Strength
Steel – Special Application 1 and 2, and the appropriate consumable grade for the relevant material class. Q1(N) grade steel is an
example of an acceptable material, and HSS1 is an example of an acceptable consumable grade.

7.3 General requirements

7.3.3 Welding procedures for High Strength Steel – Special Application 2 may be approved with a weld metal strength lower than
the minimum specified for the base material, i.e. undermatched welding. Where welding procedures are approved for undermatched
welding, the requirements specified in Ch 13, General requirements 10.3.5 are to be followed.

7.4 Welding procedure qualification tests

7.4.3 High Strength Steel – Special Application 2 butt weld applications are to be qualified via Category A and B routes. Fillet weld
applications may be qualified via Category C and D routes.

Existing paragraph 7.4.3 has been renumbered 7.4.4.

13
 Slide t, see
Side 1 Note 1

Slide
Side 2
A

Test requirements
A. Charpy, V-notch impact tests.
B. All weld metal tensile test (both sides)

Note 1. For thickness qualification range 20–100 mm, test piece thickness is to be 50 mm.
Otherwise for thicknesses below 20 mm the test plate thickness is to be 20 mm. (If outside
these thickness ranges, refer to the specific project requirements).

Note 2. The panel length is long enough to leave some archive material for retests. A shorter
panel may be used if required.

Note 3. Side 1 is the first side of the test assembly to be welded and side 2 the second side.

Existing paragraphs 7.4.4 to 7.4.7 have been renumbered 7.4.5 to 7.4.8.

7.4.8 7.4.9 The results of tensile and impact tests for test assembly A are to comply with the performance requirements of
Table 12.7.1 Mechanical property acceptance requirements for butt welding in plate (in welds that form part of the pressure hull
boundary, and tensile loading under normal submarine operation) for applicable Material Class (Special Applications) 1 and 2.

Existing paragraphs 7.4.9 to 7.4.14 have been renumbered 7.4.10 to 7.4.15.

(Part only shown)

7.4.15 7.4.16 For category A and B welds, any change in the following will require a new test piece and requalification:
(d) Parent material: Any change in plate thickness above or below 20 mm.
• Any change in parent material, except for the following permissible conditions:
o It is permissible to use a welding procedure approved for welding High Strength Steel – Special Application 1 to
weld High Strength Steel – Special Application 2, where High Strength Steel – Special Application 2 is to be welded
with undermatching weld metal.
o It is permissible to use a welding procedure approved for welding High Strength Steel – Special Application 2 using
undermatching weld metal to weld High Strength Steel – Special Application 1.
• Any change from either matched to undermatched, or undermatched to matched welding, for High Strength Steel, Special
Application 2.
• Any change in plate thickness above or below 20 mm.

14
7.5 Welding procedure specification (WPS)

7.5.1 A WPS for High Strength Steel – Special Application 2 which is approved for undermatched welding, shall specify the
maximum root gap for which the WPS is applicable. This gap should be set prior to completion of the qualification test and in
consultation with the project authority. The requirements specified in Ch 13, General requirements 10.3.5 are to be followed, in
addition if actual production welding root gaps are greater than as specified in the WPS, the project authority should be consulted.

Existing sub-Section 7.5 has been renumbered 7.6.

Chapter 13
Requirements for Welded Construction

■ Section 10
Requirements for welded construction for high strength steel for special marine
applications
10.1 Goal-based framework

10.1.6 The list of performance requirements (PR) is as follows:

(a) Welded constructions shall comply with the specified quality requirements and testing regime.
(b) Weld properties are to consistently meet the following requirements shown in Table 13.10.1 Mechanical property acceptance
requirements for consumable batch tests for consumable grade and applicable Material Class Special Application 1 and 2,
where batch testing is required by the project:
(i) average absorbed energy from Charpy V-notch tests shall not be less than 50 J, with no individual value less than 40 J.
(ii) average crystallinity shall not be less than 55 per cent, with no individual value greater than 70 per cent.
(iii) the 0,2 per cent proof strength from the all-weld metal tensile test must exceed 550 MPa and the elongation must exceed
18 per cent. Reduction of area and tensile strength values are to be recorded for information only.
(iv) the above requirements (i), (ii) and (iii) are to be demonstrated on both sides of the weld

Table 13.10.1 Mechanical property acceptance requirements for consumable batch tests for consumable grade and
applicable Material Class Special Application 1 and 2
Consumable Material Class Tensile test Charpy V-notch impact tests
grade (Special Yield Elongation Test Average Average Charpy
Application) strength (%) temperatur absorbed impact crystallinity
(N/mm2) (minimum) e (°C) energy (J) (%)
See Note 1 (minimum) (maximum)
See Note 2 See Note 3
HSS1 High Strength >550 16 −50 50 55
Steel – Special
Application 1
HSS2 High Strength >565 16 -50 50 55
(Undermatched) Steel – Special
Application 2
(Undermatched
welds)
HSS2 (Matched) High Strength >690 16 -50 50 55
Steel – Special
Application 2
(Matched welds)
Note 1. The individual reduction of area and tensile strength values together with weld metal chemical analysis are recorded
for information only.
Note 2. No individual value may be less than 40 joules.
Note 3. No individual value may be greater than 70 per cent.

10.2 LR accepted solutions for welded construction for high strength steel for special marine applications

10.2.5 The requirements presented herein represent an accepted solution for welded constructions High Strength Steel – Special
Application 1 Application 1 and 2, and the appropriate consumable grade for the relevant material class. Q1(N) grade steel is an
example of an acceptable material, and HSS1 is an example of an acceptable consumable grade.

15
10.3 General requirements

10.3.2 Welding and fabrication of High Strength Steel – Special Application 1 Applications steel is to be in accordance with Ch 13,
1 General welding requirements and Ch 13, 2 Specific requirements for ship hull structure and machinery except where outlined
below.

10.3.5 Where welding procedures for High Strength Steel – Special Application 2 are to be approved for undermatched welding,
the design should take into account the minimum yield strength of the consumable in predicting the joint or structural properties. To
ensure that design intent is maintained for any structure containing undermatched welds, the design should also account for any
design tolerances, e.g. for weld misalignment, joint gap, repair of plate or weld defects. These limits are to be rigorously applied in
production with any deviations or concessions being authorised by the project authority.

10.3.5 10.3.6 Each batch of consumables require testing by the fabricator to demonstrate that tensile and Charpy V-notch impact
properties of the weld metal meet the requirements of Ch 13, 10.1 Goal-based framework 10.1.6.(b). The tests shall be carried out
on a double-sided weld with a thickness representative of the intended production weld. The applicable parent material classes for
batch testing the welding consumables are given in Table 13.10.2 Welding consumable and parent metal combinations for batch
testing for applicable Material Class Special Application 1 and 2.

Table 13.10.2 Welding consumable and parent metal combinations for batch testing for applicable Material Class Special
Application 1 and 2
Consumables for Batch Testing Allowable Material Class (Special Application)

HSS1 Special Application 1 or 2

HSS2 (Undermatched) Special Application 1 or 2
HSS2 (Matched) Special Application 2

Existing paragraph 10.3.6 has been renumbered 10.3.7.

10.3.7 10.3.8 The application of pre-heat is required for all weld joints and is to be in accordance with the qualified welding
procedure It is the responsibility of the fabricator and any project specific requirements to define low or high restraint. The following
is recommended:
(a) For root runs a minimum pre-heat of 60°C is required for joints of low restraint and a minimum of 120°C for joints of high restraint.
(b) A minimum pre-heat of 70°C is required for all fill and cap runs. The application of pre-heat is required for all weld joints and
is to be in accordance with the qualified welding procedure, with consideration of the restraints of the intended application. The
recommended pre-heat temperatures for each Material Class (Special application 1 and 2) are shown in Table 13.10.3
Recommended pre-heat temperature requirements for applicable Material Class Special Applications 1 and 2.

Table 13.10.3 Recommended pre-heat temperature requirements for applicable Material Class
Special Applications 1 and 2
Weld Type Material thickness Root Run Filling Run
(°C minimum) (°C minimum)
High strength steel – All thicknesses 120 70
Special Application 1

High strength steel –

Special Application 2
(undermatched welds)

High strength steel – All thicknesses 120 120

Special Application 2
(matched welds)

10.3.8 A higher heat input may be necessary for thicker weld joints.

10.3.14 For weld joints between High Strength Steel – Special Application 1 or 2, to other approved structural steels, the welding
consumable is to be selected to match the strength of High Strength Steel – Special Application 1 or 2. Consumables approved to
grade HSS1 are an example of a matching consumable.

10.3.15 Welding conditions and techniques to be employed for production welding is to be in accordance with a welding procedure
qualified specifically for joining High Strength Steel – Special Application 1 or 2 to the other approved structural steel steels.

10.3.17 Final NDE of weld joints is to be carried out 48 hours after welding for High Strength Steel – Special Application 1 and High
Strength Steel – Special Application 2 undermatched welds. For High Strength Steel – Special Application 2 matched welds, final
NDE of the weld joint is to be carried out 72 hours after welding.

16
Existing paragraph 10.3.17 has been renumbered 10.3.18.

10.3.18 10.3.19 Weld repair to submersible craft intended for human occupancy already in service is to follow the requirements of
these Rules this Section and Ch 13, 6 Repair of existing ships by welding.

Chapter 14
Plastics Materials and other Non-Metallic Materials
■ Section 3
Testing procedures
3.9 Machinery chocking compounds

(Part only shown)

3.9.4 Creep is to be measured according to the following method:
(d) The temperature and loading are to be maintained for a minimum of 100 days measuring the creep at intervals of 24 hours.
The temperature and loading are to be maintained for a minimum of 1000 hours (or until stabilised), measuring the creep at
intervals of 24 hours.

3.9.5 Where a manufacturer requests a chocking resin to be reapproved and provided that there has been no change in
formulation, the following properties are to be determined on samples of chocking resin that have been subject to the cure/post-cure
conditions of the initial certification:
(a) Creep to be measured at specified loading as per initial approval over a period of 200 hours as per Ch 14, 3.9 Machinery
chocking compounds 3.9.4.
(b) Peak exotherm temperature on cured/post-cured chocking resin.
(c) Barcol hardness.
(d) Temperature of deflection under load.

Chapter 15
Corrosion Prevention
■ Section 2
Coatings
2.13 Ice Coatings

2.13.1 Low friction abrasion resistant surface coatings for use on the ice belt of Ice Class or Polar Class vessels may be recognised
for this application by LR. See MQPS Book P - CHAPTER 8 PROCEDURE 19-8 - PROCEDURE FOR RECOGNITION OF
ABRASION RESISTANT ICE COATINGS Ice Class vessels using recognised coatings will receive a 1 mm reduction in the abrasion
and corrosion allowance when calculating the required shell thickness in the ice belt. Shell plate thickness reductions that may be
applied (i.e. a reduction of the corrosion/abrasion additions, where effective protection is applied) are to comply with the following
Rule requirements:
(a) for ships with Polar Class (PC) notation, see Pt 8, Ch 2 Ice Operations – Ice Class, Table 2.10.7 Corrosion/abrasion additions
for shell plating of the Rules and Regulations for the Classification of Ships.
(b) for ships with Ice Class notation, see Pt 8, Ch 2, 1 Strengthening requirements for navigation in ice – Application of
requirements of the Rules and Regulations for the Classification of Ships.
(c) for ships with Ice Class 1AS FS, 1A FS, 1B FS, 1C FS, and 1D notation, see Pt 8, Ch 2, 1 Strengthening requirements for
navigation in ice – Application of requirements of the Rules and Regulations for the Classification of Ships.
(d) for ships with Ice Class 1E notation, see Pt 8, Ch 2, 4.3 Shell plating of the Rules and Regulations for the Classification of
Ships.
(e) for naval ships with 1AS, 1A, 1B and 1C notation, see Vol 3, Pt 1, Ch 1, 2 Hull strengthening requirements of the Rules and
Regulations for the Classification of Naval Ships.

17
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