ISO 21635:2018
(Main)Ships and marine technology — Specification of high manganese austenitic steel used for LNG tanks on board ships
Ships and marine technology — Specification of high manganese austenitic steel used for LNG tanks on board ships
This document describes the specification of high manganese (Mn) austenitic steel plates to be used for LNG tanks on board ships. The specification of high manganese austenitic steel can be also considered for design and manufacture of cargo tanks and process pressure vessels of LNG supply/terminal and transportation of fuels and traded gases. This document is primarily applicable for the specification of LNG tanks below volumetric capacity of approximately 30 000 m3 using high manganese austenitic steel. The thickness of plates is limited to between 6 mm to 40 mm.
Navires et technologie maritime — Spécification des aciers à haute teneur en manganèse utilisés pour les réservoirs de GNL à bord des navires
General Information
Relations
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 21635
First edition
2018-07
Ships and marine technology —
Specification of high manganese
austenitic steel used for LNG tanks on
board ships
Navires et technologie maritime — Spécification des aciers à haute
teneur en manganèse utilisés pour les réservoirs de GNL à bord des
navires
Reference number
ISO 21635:2018(E)
©
ISO 2018
---------------------- Page: 1 ----------------------
ISO 21635:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018
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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 21635:2018(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Required specification. 2
5 Manufacture . 2
5.1 Steel-making practice . 2
5.2 Steel plates . 2
6 Chemical composition and mechanical properties . 2
6.1 Chemical composition . 2
6.2 Mechanical properties . 3
6.2.1 Requirements of tensile strength and yield strength . 3
6.2.2 Toughness requirements . 3
6.2.3 Bend test . 3
6.3 Supplementary requirements . 4
7 Test procedures . 4
7.1 Mechanical test . 4
7.2 Retest procedures . 4
8 Weldability . 4
9 Marking . 4
10 Documentation . 5
Bibliography . 6
© ISO 2018 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 21635:2018(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 on 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 the following
URL: www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 8, Ship design.
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 2018 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 21635:2018(E)
Introduction
There have been several requirements regarding metallic materials for cryogenic applications since the
adoption of the IGC and IGF Codes. The newly developed, high manganese (Mn) austenitic steel should
possess mechanical properties including Charpy impact energy values comparable to those of materials
[1] [2]
for cryogenic service listed in both the IGC Code and IGF Code . Consequently, high Mn austenitic
steel is intended to satisfy the strength requirements of the structure of cargo tanks, fuel tanks and
piping systems of LNG carriers and LNG-fuelled ships.
This document provides a standard specification of high manganese austenitic steel for material
suppliers, ship owners, ship yards, manufacturers and shipping companies with regard to producing,
purchasing and using such materials.
© ISO 2018 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 21635:2018(E)
Ships and marine technology — Specification of high
manganese austenitic steel used for LNG tanks on board
ships
1 Scope
This document describes the specification of high manganese (Mn) austenitic steel plates to be used for
LNG tanks on board ships.
The specification of high manganese austenitic steel can be also considered for design and manufacture
of cargo tanks and process pressure vessels of LNG supply/terminal and transportation of fuels and
traded gases.
This document is primarily applicable for the specification of LNG tank
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.