ISO/FDIS 18819

Ships and marine technology — High-manganese austenitic steel — Specification for plates, sheets and coils below 6,0 mm for cryogenic temperature

This document specifies the delivery conditions for high manganese austenitic steel in forms of hot rolled or cold rolled plates, sheets, and coils for low temperature purposes. This document does not purport to address all the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. This document covers all product type with a thickness up to 6,0 mm. NOTE Refer to ISO 23430 for thin strips.

Titre manque

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: 01-Dec-2025
• Completion Date: 01-Dec-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:
— Plates, sheets and coils below 6,0
2025-12-01
mm for cryogenic temperature
Voting terminates on:
2026-01-26
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:
— Plates, sheets and coils below 6,0
mm for cryogenic temperature
Voting terminates on:
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 . 1
4 Manufacture . 2
4.1 Steel-making practice .2
4.2 Rolled product .2
4.3 Chemical composition .2
4.4 Mechanical properties .3
4.4.1 General .3
4.4.2 Tensile strength .3
4.4.3 Impact test .3
4.5 Retesting .4
4.5.1 General .4
4.5.2 Tensile test .4
4.5.3 Impact test .4
4.6 Supplementary processes (optional) .4
5 Inspection . 5
5.1 Surface quality and internal soundness .5
5.2 Weld repair .5
5.3 Dimensional inspection .5
6 Marking . . 5
7 Documentation . 6
Bibliography . 7

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 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
[1] [2]
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 plate, sheet, strip and
coil for material manufacturers, ship owners, ship yards and shipping companies with regard to producing,
purchasing and using such materials.

v
FINAL DRAFT International Standard ISO/FDIS 18819:2025(en)
Ships and marine technology — High-manganese austenitic
steel — Plates, sheets and coils below 6,0 mm for cryogenic
temperature
1 Scope
This document specifies the delivery conditions for high-manganese austenitic steel in the form of hot rolled
or cold rolled plates, sheets, and coils for low temperature purposes.
This document covers all product types with a thickness up to 6,0 mm. Refer to ISO 23430
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ISO/DIS FDIS 18819:2025(en)
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ISO /TC 8/SC 4/WG 11
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Date: 2025-04-24
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Secretariat: SAC
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Date: 2025-11-17
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Ships and marine technology — High -manganese austenitic steel —
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Plates, sheets and coils below 6,0 mm for cryogenic temperature
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St l D fi iti
ISO/DISFDIS 18819:2025(en) Formatted: Font: 11 pt
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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, Formatted: Default Paragraph Font
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
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at the address below or ISO’s member body in the country of the requester.
between Latin and Asian text, Adjust space between
Asian text and numbers
ISO copyright office
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CP 401 • Ch. de Blandonnet 8
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CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
EmailE-mail: [e-mail]
Website: www.iso.orgwww.iso.org
Published in Switzerland
Formatted: English (United Kingdom)

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ii
ISO/DISFDIS 18819:2025(en) Formatted: Font: 11 pt
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Contents
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Foreword . iv
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Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Manufacture . 2
4.1 Steel-making practice . 2
4.2 Rolled product . 2
4.3 Chemical composition . 2
4.4 Mechanical properties . 3
4.5 Retesting . 4
4.6 Supplementary processes (optional) . 5
5 Inspection . 5
5.1 Surface quality and internal soundness . 5
5.2 Weld repair . 5
5.3 Dimensional inspection . 5
6 Marking . 6
7 Documentation . 6
Bibliography . 7

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iii
ISO/DISFDIS 18819:2025(en) Formatted: Font: 11 pt
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Foreword
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Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Manufacture . 2
4.1 Steel-making practice . 2
4.2 Rolled sheet/plate, strip and coil . 2
4.3 Chemical composition . 2
4.4 Mechanical properties . 3
4.4.1 Tensile strength . 3
4.4.2 Impact test . 3
4.5 Retesting . 3
4.5.1 Tensile test . 4
4.5.2 Impact test . 4
4.6 Supplementary processes . 4
5 Inspection . 4
5.1 Surface Quality and Internal Soundness . 4
5.2 Weld repair . 4
5.3 Dimensional inspection . 4
6 Marking . 5
7 Reporting . 5
Scope 1 / normative 1 / terms 2 / sysmbols and abbreviated terms 3 / health, safety and quality
requirements 4
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iv
ISO/DISFDIS 18819:2025(en) Formatted: Font: 11 pt
Formatted: Font: 11 pt
Formatted: HeaderCentered, Left, Space After: 0 pt,
Foreword
Line spacing: single
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).
Formatted: English (United Kingdom)
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)
Formatted: Font color: Auto
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 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.
Formatted: English (United Kingdom)
Field Code Changed
This document was prepared by Technical Committee TC 8, Ships and marine technology, Subcommittee SC 4,
Formatted: Don't keep with next, Don't keep lines
Outfitting and deck machinery.
together, Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
Any feedback or questions on this document should be directed to the user’s national standards body. A
Formatted: English (United Kingdom)
complete listing of these bodies can be found at www.iso.org/members.html.
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers

Formatted: English (United Kingdom)
Field Code Changed
Formatted: Font: 10 pt
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v
ISO/DISFDIS 18819:2025(en) Formatted: Font: 11 pt
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Introduction
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The newly developed, high -manganese austenitic steel is expected to possess mechanical properties including
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Charpy impact energy values comparable to those materials for cryogenic service listed in both the IGC
[1][ ] [2] [ ]
Code 1 and IGF Code . 2 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 a piping systemsystems for
liquefied hydrogen.
This document provides a standard specification of high -manganese austenitic steel plate, sheet, strip and coil
for material manufacturers, ship owners, ship yards and shipping companies with regard to producing,
purchasing and using such materials.
Formatted: Font: 10 pt
Formatted: FooterCentered, Left, Space Before: 0 pt,
Tab stops: Not at 17.2 cm
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vi
DRAFT International Standard ISO/DIS 18819:2025(en)

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Ships and marine technology — High -manganese austenitic steel —
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Plates, sheets and coils below 6,0mm0 mm for cryogenic temperature
numbers
1 Scope
This document specifies the delivery conditions for high -manganese austenitic steel in the form of hot rolled
or cold rolled plates, sheets, and coils for low temperature purposes.
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This document covers all product types with a thickness up to 6,0 mm. Refer to ISO 23430 for specifications
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on high manganese-austenitic steel thin strips.
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Refer to ISO 23430 for thin strips.
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2 Normative references
stops: Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm +
3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
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,
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the latest edition of the referenced document (including any amendments) applies.
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ISO 148--1, Metallic materials — Charpy pendulum impact test — Part 1: Test method
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ISO 2566--1, Steel — Conversion of elongation values — Part 1: Carbon and low-alloy steels
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ISO 6892--1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature Formatted: Default Paragraph Font
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ISO 10474, Steel and steel products — Inspection documents
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ISO 16160, Hot-rolled steel sheet products — Dimensional and shape tolerances
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ISO 16162, Cold-rolled steel sheet products — Dimensional and shape tolerances
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EN 10048, Hot rolled narrow steel strip — Tolerances on dimensions and shape
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EN 10140, Cold rolled narrow steel strip — Tolerances on dimensions and shape
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3 Terms and definitions
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For the purposes of this document, the following terms and definitions apply.
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ISO and IEC maintain terminology databases for use in standardization at the following addresses:
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— — ISO Online browsing platform: available at https://www.iso.org/obphttps://www.iso.org/obp
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— — IEC Electropedia: available at https://www.electropedia.org/https://www.electropedia.org/
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3.1 3.1
coil
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long continuous sheet (3.5) of steel that has been coiled into a coil form
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3.2 3.2
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design temperature
minimum temperature for the selectio
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