Petroleum and natural gas industries - Materials for use in H2S-containing environments in oil and gas production - Part 2: Cracking-resistant carbon and low-alloy steels, and the use of cast irons (ISO 15156-2:2020)

This document gives requirements and recommendations for the selection and qualification of carbon
and low-alloy steels for service in equipment used in oil and natural gas production and natural gas
treatment plants in H2S-containing environments, whose failure can pose a risk to the health and safety
of the public and personnel or to the environment. It can be applied to help to avoid costly corrosion
damage to the equipment itself. It supplements, but does not replace, the materials requirements of the
appropriate design codes, standards or regulations.
This document addresses the resistance of these steels to damage that can be caused by sulfide stress
cracking (SSC) and the related phenomena of stress-oriented hydrogen-induced cracking (SOHIC) and
soft-zone cracking (SZC).
This document also addresses the resistance of these steels to hydrogen-induced cracking (HIC) and its
possible development into stepwise cracking (SWC).
This document is concerned only with cracking. Loss of material by general (mass loss) or localized
corrosion is not addressed.
Table 1 provides a non-exhaustive list of equipment to which this document is applicable, including
exclusions.
This document applies to the qualification and selection of materials for equipment designed and
constructed using load controlled design methods. For design utilizing strain-based design methods,
see ISO 15156-1:2020, Clause 5.
Annex A lists SSC-resistant carbon and low alloy steels, and A.2.4 includes requirements for the use of
cast irons.
This document is not necessarily suitable for application to equipment used in refining or downstream
processes and equipment.

Erdöl- und Erdgasindustrie - Werkstoffe für den Einsatz in H2S-haltiger Umgebung bei der Öl- und Gasgewinnung - Teil 2: Gegen Rissbildung beständige unlegierte und niedriglegierte Stähle und Gusseisen (ISO 15156-2:2020)

Dieses Dokument nennt Anforderungen und gibt Empfehlungen für die Auswahl und Qualifizierung von unlegierten und niedriglegierten Stählen für den Betrieb in Einrichtungen der Öl  und Gasgewinnung und in Erdgasbehandlungsanlagen im Bereich H2S haltiger Umgebungen, deren Versagen ein mögliches Gesundheits  und Sicherheitsrisiko für die Allgemeinheit und das Personal oder für die Umwelt darstellen kann. Es kann angewendet werden zur Vermeidung kostspieliger Beschädigungen infolge von Korrosion der Anlage selbst. Es ergänzt, ersetzt aber nicht die in einschlägigen Konstruktionsrichtlinien, Normen oder Regelwerken enthaltenen Anforderungen an Werkstoffe.
Dieses Dokument behandelt die Beständigkeit dieser Stähle gegen Beschädigungen, die durch H2S induzierte Spannungsrisskorrosion (SSC) und die damit verbundenen Erscheinungen der spannungsorientierten wasserstoffinduzierten Rissbildung (SOHIC) und der Weichzonenrissbildung (SZC) verursacht werden können.
Dieses Dokument behandelt außerdem die Beständigkeit dieser Stähle gegen wasserstoffinduzierte Rissbildung (HIC) und deren mögliche Verbindung zu Stufenrissen (SWC).
Dieses Dokument behandelt ausschließlich die Rissbildung. Es befasst sich nicht mit Werkstoffverlusten durch allgemeine (durch Massenverlust bedingte) oder örtliche Korrosion.
Tabelle 1 enthält als nicht erschöpfende Liste eine Übersicht von Ausrüstungen, die in den Anwendungsbereich dieses Dokumentes fallen, einschließlich Ausnahmen.
Dieses Dokument gilt für die Qualifizierung und Auswahl von Werkstoffen für Ausrüstungen, die unter Anwendung von lastgesteuerten Auslegungsverfahren ausgelegt und gebaut wurden. Für Konstruktionen, bei denen auf Dehnung beruhende Auslegungsverfahren zur Anwendung kommen, siehe ISO 15156 1:2020, Abschnitt 5.
Anhang A enthält eine Auflistung von SSC beständigen unlegierten und niedriglegierten Stählen und A.2.4 enthält Anforderungen an die Verwendung von Gusseisen.
Dieses Dokument ist nicht zwangsläufig auch für die Anwendung auf Ausrüstungen in Raffinierungs  oder nachgeschalteten Verfahren und Einrichtungen geeignet.

Industries du pétrole et du gaz naturel - Matériaux pour utilisation dans des environnements contenant de l'hydrogène sulfuré (H2S) dans la production de pétrole et de gaz - Partie 2: Aciers au carbone et aciers faiblement alliés résistants à la fissuration, et utilisation de fontes (ISO 15156-2:2020)

Industrija za predelavo nafte in zemeljskega plina - Materiali za uporabo v okoljih s H2S v proizvodnji olja in plina - 2. del: Proti razpokam odporna ogljikova in malolegirana jekla ter uporaba litega železa (ISO 15156-2:2020)

General Information

Status
Published
Public Enquiry End Date
10-Sep-2020
Publication Date
08-Dec-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
03-Dec-2020
Due Date
07-Feb-2021
Completion Date
09-Dec-2020

RELATIONS

Buy Standard

Standard
SIST EN ISO 15156-2:2021
English language
56 pages
sale 10% off
Preview
sale 10% off
Preview

e-Library read for
1 day

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN ISO 15156-2:2021
01-januar-2021
Nadomešča:
SIST EN ISO 15156-2:2015

Industrija za predelavo nafte in zemeljskega plina - Materiali za uporabo v okoljih s

H2S v proizvodnji olja in plina - 2. del: Proti razpokam odporna ogljikova in
malolegirana jekla ter uporaba litega železa (ISO 15156-2:2020)

Petroleum and natural gas industries - Materials for use in H2S-containing environments

in oil and gas production - Part 2: Cracking-resistant carbon and low-alloy steels, and the

use of cast irons (ISO 15156-2:2020)

Erdöl- und Erdgasindustrie - Werkstoffe für den Einsatz in H2S-haltiger Umgebung bei

der Öl- und Gasgewinnung - Teil 2: Gegen Rissbildung beständige unlegierte und
niedriglegierte Stähle und Gusseisen (ISO 15156-2:2020)
Industries du pétrole et du gaz naturel - Matériaux pour utilisation dans des

environnements contenant de l'hydrogène sulfuré (H2S) dans la production de pétrole et

de gaz - Partie 2: Aciers au carbone et aciers faiblement alliés résistants à la fissuration,

et utilisation de fontes (ISO 15156-2:2020)
Ta slovenski standard je istoveten z: EN ISO 15156-2:2020
ICS:
75.180.10 Oprema za raziskovanje, Exploratory, drilling and
vrtanje in odkopavanje extraction equipment
77.060 Korozija kovin Corrosion of metals
SIST EN ISO 15156-2:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 15156-2:2021
---------------------- Page: 2 ----------------------
SIST EN ISO 15156-2:2021
EN ISO 15156-2
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2020
EUROPÄISCHE NORM
ICS 75.180.01 Supersedes EN ISO 15156-2:2015
English Version
Petroleum and natural gas industries - Materials for use in
H2S-containing environments in oil and gas production -
Part 2: Cracking-resistant carbon and low-alloy steels, and
the use of cast irons (ISO 15156-2:2020)

Industries du pétrole et du gaz naturel - Matériaux Erdöl- und Erdgasindustrie - Werkstoffe für den

pour utilisation dans des environnements contenant de Einsatz in H2S-haltiger Umgebung bei der Öl- und

l'hydrogène sulfuré (H2S) dans la production de Gasgewinnung - Teil 2: Gegen Rissbildung beständige

pétrole et de gaz - Partie 2: Aciers au carbone et aciers unlegierte und niedriglegierte Stähle und Gusseisen

faiblement alliés résistants à la fissuration, et (ISO 15156-2:2020)
utilisation de fontes (ISO 15156-2:2020)
This European Standard was approved by CEN on 12 October 2020.

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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15156-2:2020 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 15156-2:2021
EN ISO 15156-2:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 15156-2:2021
EN ISO 15156-2:2020 (E)
European foreword

This document (EN ISO 15156-2:2020) has been prepared by Technical Committee ISO/TC 67

"Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries"

in collaboration with Technical Committee CEN/TC 12 “Materials, equipment and offshore structures

for petroleum, petrochemical and natural gas industries” the secretariat of which is held by NEN.

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 May 2021, and conflicting national standards shall be

withdrawn at the latest by May 2021.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 15156-2:2015.

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, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 15156-2:2020 has been approved by CEN as EN ISO 15156-2:2020 without any

modification.
---------------------- Page: 5 ----------------------
SIST EN ISO 15156-2:2021
---------------------- Page: 6 ----------------------
SIST EN ISO 15156-2:2021
INTERNATIONAL ISO
STANDARD 15156-2
Fourth edition
2020-11
Petroleum and natural gas
industries — Materials for use in H S-
containing environments in oil and
gas production —
Part 2:
Cracking-resistant carbon and low-
alloy steels, and the use of cast irons
Industries du pétrole et du gaz naturel — Matériaux pour utilisation
dans des environnements contenant de l'hydrogène sulfuré (H S) dans
la production de pétrole et de gaz —
Partie 2: Aciers au carbone et aciers faiblement alliés résistants à la
fissuration, et utilisation de fontes
Reference number
ISO 15156-2:2020(E)
ISO 2020
---------------------- Page: 7 ----------------------
SIST EN ISO 15156-2:2021
ISO 15156-2:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 15156-2:2021
ISO 15156-2:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 2

3 Terms and definitions ..................................................................................................................................................................................... 3

4 Symbols and abbreviated terms ........................................................................................................................................................... 6

5 Purchasing information ................................................................................................................................................................................ 7

6 Factors affecting the behaviour of carbon and low alloy steels in H S-containing

environments ........................................................................................................................................................................................................... 7

7 Qualification and selection of carbon and low-alloy steels with resistance to SSC,

SOHIC and SZC ......................................................................................................................................................................................................... 8

7.1 Option 1 — Selection of SSC-resistant steels (and cast irons) using A.2 ............................................. 8

7.1.1 For p < 0,3 kPa (0,05 psi) ................................................................................................................................. 8

7.1.2 For p ≥ 0,3 kPa (0,05 psi) ................................................................................................................................. 8

7.2 Option 2 — Selection of steels for specific sour-service applications or for ranges

of sour service ......................................................................................................................................................................................... 8

7.2.1 Sulfide stress cracking ................................................................................................................................................ 8

7.2.2 SOHIC and SZC ................................................................................................................................................................10

7.3 Hardness requirements ................................................................................................................................................................10

7.3.1 General...................................................................................................................................................................................10

7.3.2 Parent metals ...................................................................................................................................................................10

7.3.3 Welds .......................................................................................................................................................................................11

7.4 Other fabrication methods .........................................................................................................................................................16

8 Evaluation of carbon and low alloy steels for their resistance to HIC/SWC .........................................16

9 Marking, labelling, and documentation ....................................................................................................................................17

Annex A (normative) SSC-resistant carbon and low alloy steels (and requirements and

recommendations for the use of cast irons) .........................................................................................................................18

Annex B (normative) Qualification of carbon and low-alloy steels for H S service by

laboratory testing .............................................................................................................................................................................................27

Annex C (informative) Determination of H S partial pressure and use of alternative parameters .35

Annex D (informative) Recommendations for determining pH ............................................................................................40

Annex E (informative) Information that should be supplied for material purchasing .................................45

Bibliography .............................................................................................................................................................................................................................47

© ISO 2020 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 15156-2:2021
ISO 15156-2:2020(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore

structures for petroleum, petrochemical and natural gas industries, in collaboration with the European

Committee for Standardization (CEN) Technical Committee CEN/TC 12, Materials, equipment and

offshore structures for petroleum, petrochemical and natural gas industries, in accordance with the

Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This fourth edition cancels and replaces the third edition (ISO 15156-2:2015), which has been

technically revised. The main changes compared to the previous edition are as follows:

— corrections of temperature conversion for welding (see A.2.1.4), vold deformation and stress relief

(see A.2.1.6), identification stamping (see A.2.1.9), tubulars and tubular components (see A.2.2.3.4),

compressor impellers (see A.2.3.3.2);
— title change from Shear rams to Rams in A.2.3.2.2;
— addition of C110 and changes the designation of C95 to R95 in Table A.3;
— reference change to NACE TM0316 in Table B.1;
— addition of reference to BS 8701 in B.4.3;
— changes and additions to Table B.3;

— modification of Annex C to include alternative parameters and expanded explanation for the use of

chemical activity and fugacity, and to provide some general guidance for the use of thermodynamic

modeling for the determination of environmental severity.
A list of all parts in the ISO 15156 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 15156-2:2021
ISO 15156-2:2020(E)
Introduction

The consequences of sudden failures of metallic oil and gas field components, associated with their

exposure to H S-containing production fluids, led to the preparation of the first edition of NACE MR0175,

which was published in 1975 by the National Association of Corrosion Engineers, now known as NACE

International.

The original and subsequent editions of NACE MR0175 established limits of H S partial pressure above

which precautions against sulfide stress cracking (SSC) were always considered necessary. They

also provided guidance for the selection and specification of SSC-resistant materials when the H S

thresholds were exceeded. In more recent editions, NACE MR0175 has also provided application limits

for some corrosion-resistant alloys, in terms of environmental composition and pH, temperature and

H S partial pressures.

In separate developments, the European Federation of Corrosion issued EFC Publication 16 in 1995 and

EFC Publication 17 in 1996. These documents are generally complementary to those of NACE though

they differed in scope and detail.

In 2003, the publication of the ISO 15156-series and NACE MR0175/ISO 15156 was completed for the

first time. These technically identical documents utilized the above sources to provide requirements

and recommendations for materials qualification and selection for application in environments

containing wet H S in oil and gas production systems. They are complemented by NACE TM0177 and

NACE TM0284 test methods.

The revision of this document, i.e. ISO 15156-2,involves a consolidation of all changes agreed

and published in the Technical Circular 1, ISO 15156-2:2015/Cir.1:2017, the Technical Circular 2,

ISO 15156-2:2015/Cir.2:2018 and the Technical Circular 3, ISO 15156-2:2015/Cir.3:2019, published by

the ISO 15156 series Maintenance Agency secretariat at DIN.

The changes were developed by and approved by the ballot of, representative groups from within

the oil and gas production industry. The great majority of these changes stem from issues raised by

document users. A description of the process by which these changes were approved can be found at

the ISO 15156 series maintenance website: www .iso .org/ iso15156maintenance.

When found necessary by oil and gas production industry experts, future interim changes to this

document will be processed in the same way and will lead to interim updates to this document in

the form of Technical Corrigenda or Technical Circulars. Document users should be aware that such

documents can exist and can impact the validity of the dated references in this document.

The ISO 15156 series Maintenance Agency at DIN was set up after approval by the ISO Technical

Management Board given in document 34/2007. This document describes the make up of the agency,

which includes experts from NACE, EFC and ISO/TC 67, and the process for approval of amendments.

It is available from the ISO 15156 series maintenance website and from the ISO/TC 67 Secretariat. The

website also provides access to related documents that provide more detail of the ISO 15156 series

maintenance activities.
© ISO 2020 – All rights reserved v
---------------------- Page: 11 ----------------------
SIST EN ISO 15156-2:2021
---------------------- Page: 12 ----------------------
SIST EN ISO 15156-2:2021
INTERNATIONAL STANDARD ISO 15156-2:2020(E)
Petroleum and natural gas industries — Materials
for use in H S-containing environments in oil and gas
production —
Part 2:
Cracking-resistant carbon and low-alloy steels, and the use
of cast irons

WARNING — Carbon and low-alloy steels and cast irons selected using this document are

resistant to cracking in defined H S-containing environments in oil and gas production but

not necessarily immune to cracking under all service conditions. It is the equipment user's

responsibility to select the carbon and low alloy steels and cast irons suitable for the intended

service.
1 Scope

This document gives requirements and recommendations for the selection and qualification of carbon

and low-alloy steels for service in equipment used in oil and natural gas production and natural gas

treatment plants in H S-containing environments, whose failure can pose a risk to the health and safety

of the public and personnel or to the environment. It can be applied to help to avoid costly corrosion

damage to the equipment itself. It supplements, but does not replace, the materials requirements of the

appropriate design codes, standards or regulations.

This document addresses the resistance of these steels to damage that can be caused by sulfide stress

cracking (SSC) and the related phenomena of stress-oriented hydrogen-induced cracking (SOHIC) and

soft-zone cracking (SZC).

This document also addresses the resistance of these steels to hydrogen-induced cracking (HIC) and its

possible development into stepwise cracking (SWC).

This document is concerned only with cracking. Loss of material by general (mass loss) or localized

corrosion is not addressed.

Table 1 provides a non-exhaustive list of equipment to which this document is applicable, including

exclusions.

This document applies to the qualification and selection of materials for equipment designed and

constructed using load controlled design methods. For design utilizing strain-based design methods,

see ISO 15156-1:2020, Clause 5.

Annex A lists SSC-resistant carbon and low alloy steels, and A.2.4 includes requirements for the use of

cast irons.

This document is not necessarily suitable for application to equipment used in refining or downstream

processes and equipment.
© ISO 2020 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 15156-2:2021
ISO 15156-2:2020(E)
Table 1 — List of equipment
This document is applicable to materials used
Exclusions
for the following equipment

Drilling, well construction and well-servicing Equipment exposed only to drilling fluids of controlled

equipment composition
Drill bits
Blowout preventer (BOP) shear blades
Drilling riser systems
Work strings
Wireline and wireline equipment
Surface and intermediate casing

Wells, including subsurface equipment, gas lift Sucker rod pumps and sucker rods

equipment, wellheads and christmas trees
Electric submersible pumps
Other artificial lift equipment
Slips

Flow-lines, gathering lines, field facilities and field Crude oil storage and handling facilities operating at a

processing plants total absolute pressure below 0,45 MPa (65 psi)
Water-handling equipment Water-handling facilities operating at a total absolute
pressure below 0,45 MPa (65 psi)
Water injection and water disposal equipment
Natural gas treatment plants —

Transportation pipelines for liquids, gases and Lines handling gas prepared for general commercial

multiphase fluids and domestic use
For all equipment above Components loaded only in compression
See A.2.3.2.3 for more information.
See A.2.3.2.1 for more information.
Wireline lubricators and lubricator connecting devices are not excluded.
For sucker rod pumps and sucker rods, reference can be made to NACE MR0176.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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.

ISO 6506 (all parts), Metallic materials — Brinell hardness test
ISO 6507 (all parts), Metallic materials — Vickers hardness test
ISO 6508 (all parts), Metallic materials — Rockwell hardness test

ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature

ISO 10423, Petroleum and natural gas industries — Drilling and production equipment — Wellhead and

christmas tree equipment

ISO 15156-1:2020, Petroleum and natural gas industries — Materials for use in H S-containing

environments in oil and gas production — Part 1: General principles for selection of cracking-resistant

materials

ISO 15156-3, Petroleum and natural gas industries — Materials for use in H S-containing environments in

oil and gas production — Part 3: Cracking-resistant CRAs (corrosion-resistant alloys) and other alloys

2 © ISO 2020 – All rights reserved
---------------------- Page: 14 ----------------------
SIST EN ISO 15156-2:2021
ISO 15156-2:2020(E)

NACE TM0177 , Laboratory testing of metals for resistance to sulfide stress cracking and stress corrosion

cracking in H S environments

NACE TM0284, Evaluation of pipeline and pressure vessel steels for resistance to hydrogen-induced cracking

NACE TM0316, Four-point bend testing of materials for oil and gas applications
SAE AMS-2430 , Shot Peening
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 15156-1 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
Brinell hardness
HBW

hardness value of a material measured normally using a 10 mm diameter tungsten carbide ball indenter

with a force of 29,42 kN

Note 1 to entry: The measurement shall be in accordance with the ISO 6506 series. Here, ASTM E10 is equivalent

to ISO 6506-1.
3.2
bubble-point pressure

pressure under which gas bubbles form in a liquid at a particular operating temperature

Note 1 to entry: See C.2.
3.3
burnishing

process of smoothing surfaces using frictional contact between the material and some other hard

pieces of material, such as hardened steel balls
3.4
casting

metal that is obtained at or near its finished shape by the solidification of molten metal in a mould

3.5
cast iron
iron-carbon alloy containing approximately 2 % to 4 % mass fraction carbon
3.5.1
grey cast iron

cast iron that displays a grey fracture surface due to the presence of flake graphite

3.5.2
white cast iron

cast iron that displays a white fracture surface due to the presence of cementite

1) www .nace .org
2) www .sae .org
© ISO 2020 – All rights reserved 3
---------------------- Page: 15 ----------------------
SIST EN ISO 15156-2:2021
ISO 15156-2:2020(E)
3.5.3
malleable iron

white cast iron that is thermally treated to convert most or all of the cementite to graphite (temper carbon)

3.5.4
ductile iron
nodular cast iron

cast iron that has been treated while molten with an element (usually magnesium or cerium) that

spheroidizes the graphite
3.6
cementite

microstructural constituent of steels composed principally of iron carbide (Fe C)

3.7
cold deforming
cold forging
cold forming
cold working

deforming metal plastically under conditions of temperature and strain rate that induce strain-

hardening, usually, but not necessarily, conducted at room temperature
3.8
fitness-for-purpose
suitability for use under the expected service conditions
3.9
free-machining steel

steel to which elements such as sulfur, selenium and lead have been added intentionally to improve

machineability
3.10
lower critical temperature

temperature of a ferrous metal at which austenite begins to form during heating or at which the

transformation of austenite is completed during cooling
3.11
nitriding

case-hardening process in which nitrogen is introduced into the surface of metallic materials (most

commonly ferrous alloys)
EXAMPLE Liquid nitriding, gas nitriding, ion nitriding and plasma nitriding.
3.12
normalize

heating a ferrous metal to a suitable temperature above the transformation range (austenitizing),

holding at temperature for a suitable time and then cooling in still air (or protective atmosphere) to a

temperature substantially below the transformation range
3.13
plastically deformed

permanently deformed by stressing beyond the limit of elasticity, i.e. the limit of proportionality of

stress to strain
3.14
pressure-containing part

part whose failure to function as intended results in a release of retained fluid to the atmosphere

EXAMPLE Valve bodies, bonnets and stems.
4 © ISO 2020 – All rights reserved
---------------------- Page: 16 ----------------------
SIST EN ISO 15156-2:2021
ISO 15156-2:2020(E)
3.15
quenched and tempered
quench hardened and then tempered
3.16
Rockwell C hardness
HRC

hardness value of a material measured using a Rockwell C diamond cone indenter with a force of 1 471 N

Note 1 to entry: The measurement shall be in accordance with the ISO 6508 series. Here, ASTM E18 is equivalent

to ISO 6508-1.
3.17
shot-peening

inducing compressive stresses in the surface layer of a material by bombarding it with a selected

medium (usually round steel shot) under controlled conditions
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.