ISO/FDIS 18760

Ships and marine technology — High manganese austenitic steel — Longitudinally welded high manganese austenitic steel pipes for cryogenic temperature

This document specifies the delivery conditions for welded pipes of circular cross-section, made of high manganese austenitic steel, which are supplied for low temperature pressure purposes. This document is applicable to all pressure retaining components and any non-pressure retaining component, such as a member of a pipe support, welded directly to a pressure retaining component.

Navires et technologie maritime — Acier austénitique à haute teneur en manganèse — Tuyaux soudés longitudinallement en acier austénitique à haute teneur en manganèse pour température cryogénique

General Information

• Status: Not Published
• ICS: 47.020.05 - Materials and components for shipbuilding
• Technical Committee: ISO/TC 8/SC 4 - Outfitting and deck machinery
• Drafting Committee: ISO/TC 8/SC 4 - Outfitting and deck machinery
• Current Stage: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 04-Nov-2025
• Completion Date: 04-Nov-2025

Standards Content (Sample)

FINAL DRAFT
International
Standard
ISO/TC 8/SC 4
Ships and marine technology —
Secretariat: SAC
High manganese austenitic steel
Voting begins on:
— Longitudinally welded high
2025-11-04
manganese austenitic steel pipes
Voting terminates on:
for cryogenic temperature
2025-12-30
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 8/SC 4
Ships and marine technology —
Secretariat: SAC
High manganese austenitic steel
Voting begins on:
— Longitudinally welded high
manganese austenitic steel pipes
Voting terminates on:
for cryogenic temperature
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms. 3
4.1 Symbols .3
4.2 Abbreviated terms .3
5 Health, safety and quality requirements . 3
5.1 Health and safety requirements .3
5.2 Quality requirements .4
6 Manufacturing process . 5
6.1 Steelmaking process .5
6.2 Rolled product .5
7 Welding requirements . 5
7.1 General requirements .5
7.2 Welding processes .6
7.3 Preparation for welding .6
7.4 Welder and welding operator performance qualification .6
7.5 Welding consumables .7
8 Welding procedure qualification . 7
9 Metallurgical properties . 8
9.1 Chemical composition .8
9.2 Mechanical properties .8
9.2.1 Preparation of test specimens and extend of testing .8
9.2.2 Tensile testing .9
9.2.3 Impact test .10
9.2.4 Bend testing or flattening test .11
9.2.5 Retesting .11
10 Dimensions, mass and tolerances .12
10.1 Diameters, wall thickness and masses . 12
10.2 Tolerances on lengths . 12
11 Inspection .12
11.1 Visual inspection . 12
11.2 Hydrostatic test . 13
11.3 Non-destructive testing . 13
11.4 Preparation of ends . 13
12 Marking . . 14
13 Documentation . 14
Bibliography .15

iii
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 TC 8, Ships and marine technology, Subcommittee SC 4,
Outfitting and deck machinery.
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
Introduction
The aim of this document is to provide a set of common requirements for metallic materials used in cryogenic
[1] [2]
applications, in alignment with the IGC Code and IGF Code adopted by the International Maritime
Organization (IMO).
The newly developed, high manganese austenitic steel is expected to possess mechanical properties
including Charpy impact energy values comparable to those materials for cryogenic service listed in both the
IGC Code and IGF Code. Consequently, high manganese steel is intended to satisfy the strength requirements
of the structure of cargo tanks, fuel tanks and piping systems.
In addition, upon agreement with a purchaser, this document can be applied to piping systems for liquefied
hydrogen.
This document provides a standard specification of high manganese austenitic steel forgings for material
suppliers, ship owners, ship yards, manufacturers and shipping companies with regard to producing,
purchasing and using such materials.

v
FINAL DRAFT International Standard ISO/FDIS 18760:2025(en)
Ships and marine technology — High manganese austenitic
steel — Longitudinally welded high manganese austenitic
steel pipes for cryogenic temperature
1 Scope
This document specifies the delivery conditions for longitudinally welded pipes of circular cross
...

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ISO/FDIS 18760:2025(en)
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ISO /TC 8/SC 4/WG 11
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Date: 2025-09-02 0 pt, Section start: New page, Header distance from
edge: 36 pt, Footer distance from edge: 36 pt
Secretariat: SAC
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Date: 2025-10-21
Formatted
Ships and marine technology — High manganese austenitic steel — .
Formatted: Cover Title_A1
Longitudinally welded high manganese austenitic steel pipes for
cryogenic temperature
FDIS stage
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All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
between Latin and Asian text, Adjust space between
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
Asian text and numbers
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
Formatted: Default Paragraph Font
at the address below or ISO’s member body in the country of the requester.
Formatted: Default Paragraph Font
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
EmailE-mail: [e-mail]
Formatted: German (Germany)
Website: www.iso.orgwww.iso.org
Published in Switzerland
Formatted: English (United Kingdom)

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ii
Formatted: Font: 11 pt
Formatted: HeaderCentered, Left, Space After: 0 pt,
Line spacing: single
Contents
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms . 3
4.1 Symbols . 3
4.2 Abbreviated terms . 3
5 Health, safety and quality requirements . 4
5.1 Health and safety requirements . 4
5.2 Quality requirements . 4
6 Manufacturing process . 6
6.1 Steelmaking process . 6
6.2 Rolled product . 6
7 Welding requirements . 6
7.1 General requirements . 6
7.2 Welding processes . 7
7.3 Preparation for welding . 7
7.4 Welder and welding operator performance qualification . 7
7.5 Welding consumables . 7
8 Welding procedure qualification . 8
9 Metallurgical properties . 9
9.1 Chemical composition . 9
9.2 Mechanical properties . 9
10 Dimensions, mass and tolerances . 13
10.1 Diameters, wall thickness and masses . 13
10.2 Tolerances on lengths . 14
11 Inspection . 14
11.1 Visual inspection . 14
11.2 Hydrostatic test . 15
11.3 Non-destructive testing . 15
11.4 Preparation of ends . 15
12 Marking . 16
13 Documentation . 16
Bibliography . 17

Foreword . iv
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Introduction . v
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1 Scope . 1
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2 Normative references . 1
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iii
Formatted: HeaderCentered
Formatted: Font: Bold
3 Terms and definitions . 2
4 Symbols and abbreviated terms . 3
5 Health, safety and quality requirement . 4
5.1 Health and safety requirements . 4
5.2 Quality requirements . 4
6 Manufacturing process . 5
6.1 Steelmaking process . 5
6.2 Rolled product . 6
7 Welding requirements . 6
7.1 General requirements . 6
7.2 Welding processes . 6
7.3 Preparation for welding . 7
7.4 Welder and welding operator performance qualification . 7
7.5 Welding consumables . 7
8 Welding procedure qualification . 8
9 Metallurgical properties . 9
9.1 Chemical composition . 9
9.2 Mechanical properties . 9
10 Dimensions, mass and tolerances . 12
10.1 Diameters, wall thickness and masses . 12
10.2 Tolerances on lengths . 13
11 Inspection . 13
11.1 Visual inspection . 13
11.2 Hydrostatic test . 14
11.3 Non-destructive testing . 14
11.4 Preparation of ends . 14
12 Marking . 14
13 Documentation . 15
Bibliography . 16
Formatted: FooterPageRomanNumber
iv
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Formatted: HeaderCentered, Left, Space After: 0 pt,
Line spacing: single
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents.www.iso.org/patents. ISO shall not be held responsible for i
...