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REVIEWERS

ARTAZA Evaristo TENARIS,

KISSNER Gustavo PREN-OCTG,
MEDINA Fernando DICA, PEI
Dunguo TS.ca, GONZALEZ D.
Alejandro TENARIS,
SPELGATTI Renato DIQU
TenarisDalmine

APPROVER

LOPEZ TURCONI Gustavo

TENARIS

Specification for Thermal

Service Grades TN 55TH and TN
80TH

PREN OCTG

Procedure No./Revision PSP00080/6

Former Code:
Effective Date 14/Apr/2015
Total pages 10

This document as well as the information or data contained herein are the exclusive property of Tenaris Connections Ltd. and/or its affiliated
companies ("Tenaris") and as such are to be considered confidential. This document or any information and/or data contained herein shall not be
copied, reproduced, disclosed, distributed or otherwise used to and/or by third parties for any purpose without the express, prior and written consent
of Tenaris. Such prohibited actions will be prosecuted to the fullest extent of the law. ALL RIGHTS RESERVED.

Replaces and supersedes

PSP00080/5
Changes are indicated in the
document.
Tenaris – OCTG Product Specification Procedure No./Revision PSP00080/6

OCTG Product Specification

for Thermal Service Grades
TN 55TH and TN 80TH
Table of Contents

OBJECTIVE ......................................................................................2
SCOPE ............................................................................................2 5 DIMENSIONS, WEIGHTS AND LENGTHS .................................6
REQUIREMENTS ..............................................................................2 6 INSPECTION ...........................................................................7
1 MANUFACTURING TECHNOLOGY FOR SEAMLESS PIPE..........2 6.1 PIPE BODY AND COUPLING MATERIAL INSPECTION ...........................7
1.1 STEEL MAKING .........................................................................2 7 HYDROSTATIC TEST...............................................................7
1.2 ROLLING ..................................................................................3 8 PIPE ENDS ..............................................................................7
1.3 HEAT TREATMENT .....................................................................3 9 PIPE SURFACE AND THREADS PROTECTION ...........................8
1.4 STRAIGHTENING ........................................................................3 9.1 PIPE BODY ...............................................................................8
1.5 TRACEABILITY ...........................................................................3 9.2 COUPLING THREAD ....................................................................8
2 MATERIAL REQUIREMENTS ....................................................3 9.3 THREADED ENDS .......................................................................8
2.1 CHEMICAL COMPOSITION ...........................................................3 10 MARKING ..............................................................................8
2.2 MECHANICAL PROPERTIES ...........................................................4 11 IDENTIFICATION.....................................................................8
2.2.1 TENSILE AND HARDNESS PROPERTIES .............................................4 12 HANDLING.............................................................................8
2.2.2 HARDNESS VARIATION (ON QUENCHED AND TEMPERED MATERIAL).....4 13 QUALITY ASSURANCE ...........................................................8
2.2.3 FRACTURE TOUGHNESS – IMPACT TEST .........................................5 14 SUPPLEMENTARY REQUIREMENT 1: THERMAL PROPERTIES....9
3 TESTING FREQUENCY ............................................................5 15 SUPPLEMENTARY REQUIREMENT 2: API MONOGRAMMING
3.1 CHEMICAL COMPOSITION ...........................................................5 TO PSL1 ..........................................................................................9
3.2 TENSILE TEST ............................................................................5 15.1 MARKING ................................................................................9
3.3 HARDNESS TEST ........................................................................6 15.2 IDENTIFICATION .........................................................................9
3.4 IMPACT TEST ............................................................................6 16 SUPPLEMENTARY REQUIREMENT 3: FRACTURE TOUGHNESS -
4 RETESTING FOR CHEMICAL ANALYSIS AND MECHANICAL IMPACT TEST ................................................................................10
PROPERTIES ....................................................................................6

OBJECTIVE
The objective of this Product Specification is to define the specific requirements of the TN 55TH and
TN 80TH Proprietary Grades to be manufactured at Tenaris mills.
Any other technical requirement, not indicated in the present specification, shall comply with
Specification API 5CT 9th Edition and/or ISO 11960 5th Edition “Specification for Casing and Tubing” for
K55 or L80 Type 1, PSL 1, unless otherwise agreed with the customer and so stated on the purchase
agreement.
Unless otherwise specified all referenced standards and specifications shall be the latest edition.

SCOPE
This technical specification covers all pipes and couplings for the production of heavy oil under severe
thermal service wells (SAGD or CSS applications).
Tenaris products and services are only subject to Tenaris’ standard terms and conditions or otherwise to
the terms resulting from the respective contracts of sale, services or license, as the case may be.
Grades TN 55TH and TN 80TH comply with Energy Resources Conservation Board (ERCB) Directive 010,
requirements for Sour Wells.

REQUIREMENTS

1 MANUFACTURING TECHNOLOGY FOR SEAMLESS PIPE

Seamless pipes shall be manufactured by the following processes:
1.1 Steel Making
Melting shall be done in the Electric Arc Furnace (EAF), with Eccentric Bottom Tapping (EBT) system or
Blast Furnace (BF) – Basic Oxygen Furnace (BOF) process, shall be carried out with a combined blowing
Specification for Thermal Service Grades TN 55TH and TN 80TH 2/10
Tenaris – OCTG Product Specification Procedure No./Revision PSP00080/6

system; oxygen gas top blowing and argon gas bottom blowing (in case of NKKTubes only), and
controlled tapping operation.
Aluminium de-oxidation shall be used to produce fine grain fully killed steel. Liquid steel refining shall be
done by controlling the slag and Argon gas bubbling in the Ladle Furnace. Ca-Si wire injection treatment
shall be done to control residual non-metallic inclusions’ shape.
Round bars shall be manufactured by continuous casting or continuous casting followed by rolling. Ingot
casting will be used when dimensions (diameter and/or wall thickness) may not be obtained by other
casting methods.
1.2 Rolling
All rolling operations shall be done under hot conditions by retained mandrel mill, floating mandrel mill
or plug mill processes. A pilger or expander mill will be used only when dimensions (diameter and/or
wall thickness) may not be obtained by other hot rolling methods.
1.3 Heat Treatment
Pipe body for grade TN 55TH may be in as rolled condition, normalized or on-line normalized,
normalized and tempered or quenched and tempered according to pipe diameter and wall thickness.
Mother pipes for couplings may be normalized, on-line normalized, normalized and tempered or
quenched and tempered according to pipe diameter and wall thickness.
Pipe body for grade TN 80TH shall be quenched and tempered. The minimum tempering temperature
shall be 621 °C (1150 °F).
When applied, quenching shall be performed either in a quenching tank by internal-external cooling or
by means of quenching heads by external cooling according to the external diameter and wall thickness.
The heat treatment shall be performed in automated lines, with the heat treatment cycle defined
according to the pipe diameter and wall thickness.
1.4 Straightening
For TN 55TH no specific methods are required.
For TN 80TH the process shall be carried out according to Specification API 5CT and/or ISO 11960 for
Group 2. The minimum temperature at the end of hot rotary straightening shall be 530 °C (986 ºF).
Upset material may be cold rotary straightened provided it is subsequently stress relieved.
When necessary, light gag-straightening to eliminate hook ends shall be permitted.
Ends cold-forming operations (pin-swaged and/or box-expanded) may be performed provided the
material is subsequently stress relieved.
1.5 Traceability
Traceability shall be in accordance with Specification API 5CT and/or ISO 11960 (Section 6.4).

2 MATERIAL REQUIREMENTS
2.1 Chemical Composition
The chemical composition for heat and product analysis shall comply with the requirements indicated in
Table No. 1.
Table No. 1. Heat and Product Chemical Analysis
TN 55TH
C Mn P S Mo Cr Ni B Nb Ti Al Si Cu P+S
Min. - - - - - - - - - - 0.010 - - -
Max. 0.35 (1) 1.35 (2) 0.020 (3) 0.015 0.20 0.25 0.20 0.001 0.005 0.025 - 0.50 0.25 0.030

TN 80TH
C Mn P S Mo Cr B Al Si P+S
Min. - - - - - - - 0.010 - -
(5) (6) (7)
Max. 0.32 (4)
1.40 0.020 0.010 0.85 1.20 0.003 - 0.35 0.025 (8)
(1) C may be raised to 0.38% if S < 0.010%; C may be raised to 0.40% if S < 0.010% and P < 0.015%.
Specification for Thermal Service Grades TN 55TH and TN 80TH 3/10
Tenaris – OCTG Product Specification Procedure No./Revision PSP00080/6

(2) Mn may be raised to 1.45% if S < 0.010%; Mn may be raised to 1.55% if S < 0.007%.
(3) P may be raised to 0.025% if S <0.010%.
(4) C may be raised to 0.35% if S < 0.005% and P < 0.015%.
(5) Mn may be raised to 1.45% if S < 0.007%, Mn may be raised to 1.50% if S < 0.005%.
(6) P may be raised to 0.025% if Cr + Mo > 0.30%. P may be raised to 0.025% if S <0.005%.
(7) S may be raised to < 0.015% if Cr + Mo > 0.60%.
(8) P+S may be raised to < 0.030% if Cr + Mo > 0.30%, and to < 0.035% if Cr + Mo >0.6%.
Microalloying elements may be added. All intended additions shall be detailed in manufacturing documents (QCP)
for customer's approval if required.

2.2 Mechanical Properties

2.2.1 Tensile and Hardness Properties
The specified mechanical properties are shown in Table No. 2. For
TN 55TH couplings in quenched and tempered condition, mechanical properties shall be in accordance
with Table No. 3. Tensile testing shall be performed in accordance with Specification API 5CT and/or ISO
11960 (Section 10.4).
Pipe hardness measurement shall be performed in the laboratory according to Specifications ASTM E 18,
and API 5CT and/or ISO 11960, and results shall comply with values specified in Table No. 2. For
hardness values below 20HRC the Rockwell B-Scale may be used as per API 5CT and/or ISO 11960
(Section 10.6.10).
Table No. 2. Specified Mechanical Properties
Maximum Maximum
Minimum
Yield Strength Elongation Hardness Hardness
Grade Tensile Strength
psi (MPa) ( % in 2” ) Reading Value
psi (MPa)
HRC HRC
55,000 – 80,000 (*) 95,000
TN 55TH According - 22
( 379 – 552 ) ( 655 )
to API
80,000 - 95,000 95,000 Formula
TN 80TH 22 21
( 552 - 655 ) ( 655 )
(*) The maximum Yield Strength variation for any order/item shall be 20,000 psi (138 MPa).

Table No. 3. Mechanical Properties for TN 55TH Coupling Material in Quenched and Tempered Condition
Maximum Maximum
Minimum
Yield Strength Elongation Hardness Hardness
Grade Tensile Strength
psi (MPa) ( % in 2” ) Reading Value
psi (MPa)
HRC HRC
55,000 – 80,000 95,000 According to
TN 55TH - 22
( 379 – 552 ) ( 655 ) API Formula

2.2.2 Hardness Variation (On Quenched and Tempered Material)

Quenched and tempered material (TN 55TH, when quenched and tempered, and TN 80TH) shall comply
with the allowable maximum through-wall hardness variation defined in Table 4. The hardness survey
shall be performed in accordance with Specification API 5CT and/or ISO 11960.

Specification for Thermal Service Grades TN 55TH and TN 80TH 4/10

Tenaris – OCTG Product Specification Procedure No./Revision PSP00080/6

Table No. 4. Allowed Hardness Variation

Allowable Hardness
Nominal wall thickness
Difference
(in)
(HRC)
0.500 or less 3.0
0.501 to 0.749 4.0
0.750 to 0.999 5.0
1.000 and above 6.0

2.2.3 Fracture Toughness – Impact Test

Charpy V-Notch impact testing shall be performed in accordance with Specification API 5CT and/or ISO
11960.
Required toughness values are indicated in Table No. 5 for pipe body and in Table No. 6 for coupling. All
samples shall be tested in the transverse direction.
Where full-size test specimens for the test cannot be obtained, due to the pipe wall thickness, sub-size
samples may be tested according to Specification API 5CT and/or ISO 11960. The required minimum
values shown in Tables No. 5 and Table No. 6 shall be reduced in accordance with the reduction factor
shown in API 5CT and/or ISO 11960 (Section 7.3.6).
If transverse sub-size specimens cannot be obtained, longitudinal sampling shall be carried out according
to Specification API 5CT and/or ISO 11960 (Section 7.3.3). Required toughness values are indicated in
Tables No. 5 for pipe body and in Table No. 6 for coupling.

Table No. 5. Minimum Charpy Impact Toughness values - Pipe Body

Transversal Longitudinal
Test Temperature
Grade Min. Average Min. Average
(°C)
(Joules) (Joules)
TN 55TH 40 60 21
TN 80TH 55 80 0

Table No. 6. Minimum Charpy Impact Toughness values – Coupling Material

Transversal Longitudinal
Test Temperature
Grade Min. Average Min. Average
(°C)
(Joules) (Joules)
TN 55TH 32 48 21
TN 80TH 50 75 0

3 TESTING FREQUENCY
3.1 Chemical Composition
For heat analysis, frequency of chemical composition shall be one test per heat.
For product analysis, the requirement shall be as per API 5CT and/or ISO 11960 (Section 10.3.2).
3.2 Tensile Test
- Frequency for pipe
Grade TN 55TH:
 For pipes with OD < 6 5/8 in, one tensile test shall be performed for each lot of 400 lengths or less
of each size.
 For pipes with OD ≥ 6 5/8 in, one tensile test shall be performed for each lot of 200 lengths or less
of each size.

Specification for Thermal Service Grades TN 55TH and TN 80TH 5/10

Tenaris – OCTG Product Specification Procedure No./Revision PSP00080/6

Grades TN 80TH:
 For pipes with OD  4 ½ in, two tensile test shall be performed for each lot of 200 lengths or less of
each size.
 For pipes with OD  4 ½ in, two tensile test shall be performed for each lot of 100 lengths or less of
each size.
- Frequency for couplings
Grade TN 55TH:
 Coupling material for pipes with OD  4 ½ in, one tensile test shall be performed for each lot of 200
lengths or less of each size.
 Coupling material for pipes with OD  4 ½ in, one tensile test shall be performed for each lot of 100
lengths or less of each size.
Grades TN 80TH:
 Coupling material for pipes with OD  4 ½ in, two tensile tests shall be performed for each lot of
200 lengths or less of each size.
 Coupling material for pipes with OD  4 ½ in, two tensile tests shall be performed for each lot of
100 lengths or less of each size.
 The lengths for testing shall be selected at random. The selection procedure shall provide two
samples representing the start and the end of the heat treatment cycle.
3.3 Hardness Test
The testing frequency shall be as per tensile testing (3.2 of this specification). Hardness testing shall be
performed in one quadrant through the pipe wall thickness.
3.4 Impact Test
The testing frequency shall be as per tensile testing, Section 3.2 of this specification.

4 RETESTING FOR CHEMICAL ANALYSIS AND MECHANICAL PROPERTIES

If any sample, obtained for chemical analysis or mechanical properties, fails to meet the requirements of
this specification, re-testing of the material shall be carried out in accordance with Specification API 5CT
and/or ISO 11960 (Section 10).
For coupling material, tensile retest shall be carried out in accordance with Specification API 5CT and/or
ISO 11960 (Section 10.4.10).

5 DIMENSIONS, WEIGHTS AND LENGTHS

Total wall thickness dispersion for pipes will be defined as the WT difference along the manufacturing
lot as showed in Figure No.1. Maximum allowed wall thickness dispersion shall be as indicated in Table
No. 7.
Wall thickness variation for pipes will be defined as the maximum WT difference through a pipe single
section as showed in Figure No.1. Maximum allowed wall thickness variation shall be as indicated in
Table No. 7.
Table No. 7. Allowed Wall Thickness Variation and Dispersion
Specified wall Maximum wall Maximum wall
thickness thickness dispersion thickness variation
(mm) (%) (%)
6 to 7.99 -12.5/+15 20
8 to 9.99 +/-12.5 16
10 and above +/-10 (*) 13
(*) For pipe ends, up to 1.5 m from each side, the allowed maximum wall
thickness dispersion should be +/- 12.5%.
Pipes OD ovality shall be 0.75% maximum.
Pipes shall be supplied to a straightness requirement of 1:600 (1.66 mm per meter).
Pipe length tolerance within the order item shall be 3 feet (914 mm).
Specification for Thermal Service Grades TN 55TH and TN 80TH 6/10
Tenaris – OCTG Product Specification Procedure No./Revision PSP00080/6

Maximum WT in a lot

Wall Thickness

Maximum single section

Maximum
Maximum
admissible
admissible
wall thickness variation
wall thickness
WT dispersion
dispersion

One Pipe
One Pipe
One Pipe

Minimum WT in a lot

One Lot

Fig No.1 Wall Thickness Variation and Dispersion.

6 INSPECTION
Inspection methods and rejection criteria shall be according to Specification API 5CT and/or ISO 11960.
6.1 Pipe Body and Coupling Material Inspection
Visual inspection shall be carried out according to Specification API 5CT and/or ISO 11960.
Casing and Tubing:
One method or any combination of UT (external/internal), EMI (external/internal for thin walls) or MPI
(external) shall be used to detect longitudinal defects on the outside and inside surfaces to acceptance
level L4. This inspection shall be in accordance with API 5CT and/or ISO 11960 (Section 10.15.6).
Coupling Material:
UT inspection shall be performed for detection of laminations.
Couplings shall be inspected with magnetic particle (MPI) after threading and before surface treating
and painting. This inspection shall be in accordance with Specification API 5CT and/or ISO 11960
(Section 9.12).

7 HYDROSTATIC TEST
Hydrostatic test shall be in accordance with Specification API 5CT and/or ISO 11960 (Section 10.12).
Test pressure shall be calculated according to Specification API 5CT and/or ISO 11960 (Section 10.12.3).

8 PIPE ENDS
Pipe ends may be furnished either plain or with any of the following threads, as specified in the
purchase order:
 Premium
 API Specification - 5B Threads.
We recommend the use of Premium connections designed for this particular service.

Specification for Thermal Service Grades TN 55TH and TN 80TH 7/10

Tenaris – OCTG Product Specification Procedure No./Revision PSP00080/6

9 PIPE SURFACE AND THREADS PROTECTION

9.1 Pipe Body
The pipe body shall be externally varnished for surface protection while in transit as per Specification API
5CT and/or ISO 11960. Upon request of the customer, and if so is stated in the purchase agreement,
pipe body shall be externally bare; in this case only stencilled information will be protected with varnish.
9.2 Coupling Thread
Coupling threaded surface shall be treated with phosphate, zinc plating or by other process defined by
proprietary connection procedures.
9.3 Threaded Ends
Storage compound or any other product defined by proprietary connection procedures (i.e.: Dopeless®
technology) shall be applied on exposed threads. Pin and box ends shall be provided with thread
protectors, according to internal specifications or customer requirements.

10 MARKING
All pipes shall be marked following the markings sequence of Specification API 5CT and/or ISO 11960,
(without “API 5CT”, license number and the API monogram). The name of the proprietary grades shall
be included in the marking sequence as the grade of pipe.
In addition each pipe shall be die stamped, using a low stress method, on the coupling side. Die
stamped string shall not finish at a distance greater than 500 mm from the pipe body side bearing face
of the coupling. Die stamping string shall contain at least the following information: mill order item
number, heat number and joint number.

11 IDENTIFICATION
Steel grade identification for pipe and coupling, will be as indicated in Table No. 8.

Table No. 8. Identification Markings for Pipe and Coupling

Pipe Coupling
1st 2nd 3rd 1st 2nd Colour Bands
Grade Body
Band Band Band Band Band

TN 55TH Pink Red - Pink - Red

TN 80TH Blue Red - Blue - Red

NOTE: 1st Band is the one closer to the coupled end of the pipe and for coupling the closer to the free coupling end.

12 HANDLING
Handling of pipe shall be performed in such a manner as to prevent damage to the pipe and to prevent
cold worked spots. It is recommended the use of bumper rings, at least one at each end, synthetic
slings, protective racks and padded arms for forklift. Hooks or wire slings should not be used for lifting.

13 QUALITY ASSURANCE
Tenaris proprietary products are manufactured in accordance with the requirements of Specification API
Q1 and the International Standard ISO 9001.

Specification for Thermal Service Grades TN 55TH and TN 80TH 8/10

Tenaris – OCTG Product Specification Procedure No./Revision PSP00080/6

14 SUPPLEMENTARY REQUIREMENT 1: THERMAL PROPERTIES

Only if requested by the customer, and previously agreed with Tenaris, pipe thermal properties will be
evaluated for information purpose.
Thermal properties will be evaluated according to Tenaris internal procedures.
Aim values for pipe thermal properties will be as indicated in Table No. 9. Visual reference for these
values is available in Figure No. 2.

Table No. 9. Thermal Properties

Plateau Length ESR zone 1 ESR zone 2 ds/de at 3.5%
Grade
Max. % (Temp.>180°C) (Temp.>180°C) psi (MPa)
TN 55TL 0.6 1.2 1.2 116,030 (800)
TN 80TL 1.5 1.1 1.1 116,030 (800)
ESR zone 1 = Engineering stress ratio at zone 1 (σ1.35%/σ0.5%).
ESR zone 2 = Engineering stress ratio at zone 2 (σ3.5%/σ1.35%).
ds/de = Instantaneous Hardening Modulus at engineering stress 3.5%.

Material thermal properties for TN 55TH grade

3.5%

1.35%

0.5%

eng. Zone 1 Zone 2 Zone 3

stress
(MPa)

0.5% 1.35% 3.5%

0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0

eng. strain (%)

Fig No. 2 Engineering Stress-Strain Graph.

15 SUPPLEMENTARY REQUIREMENT 2: API MONOGRAMMING TO PSL1

Only if API monogramming is requested by the customer and so is stated in the purchase order, the
following shall apply.
15. 1 Marking
All pipes shall be marked in accordance with Specification API 5CT and/or ISO 11960. At the end of the
stencil markings sequence the name of the proprietary grade shall be added.
15.2 Identification
Identification shall be as per specification API 5CT and/or ISO 11960 (Section 11.4). Additionally, the
bands specified in Section 11 of this specification only for the pipe body shall be applied.

Specification for Thermal Service Grades TN 55TH and TN 80TH 9/10

Tenaris – OCTG Product Specification Procedure No./Revision PSP00080/6

16 SUPPLEMENTARY REQUIREMENT 3: FRACTURE TOUGHNESS - IMPACT TEST

Only if requested by the customer and so stated in the purchase agreement, the following shall apply:
Charpy V-Notch impact testing shall be performed in accordance with Specifications API 5CT and/or ISO
11960.
Required toughness values are indicated in Table No 10. All samples shall be tested in the transverse
direction.
Where full size test specimens for the test cannot be obtained, due to the pipe wall thickness, sub-size
samples may be tested according to Specification API 5CT and/or ISO 11960. The required minimum
values shown in Table No. 10 shall be reduced in accordance with the reduction factor stated in API 5CT
and/or ISO 11960 (Section 7.3.6).
If transverse sub-size specimens cannot be obtained, longitudinal sampling shall be carried out according
to Specification API 5CT and/or ISO 11960 (Section 7.3.3). Required toughness values shall be the
maximum between the ones in Table No. 10 and the required L80 Type 1 according to Specification API
5CT and/or ISO 11960 (Section 7.4 and 7.5).

Table No. 10. Transversal Minimum Absorbed Impact Energy Requirements

Min. Average Min. Individual Test Temperature
Grade
(Joules) (Joules) (°C)
TN 80TH 110 80 0

Specification for Thermal Service Grades TN 55TH and TN 80TH 10/10