prEN ISO 21028-1

SLOVENSKI STANDARD
01-maj-2024
Kriogene posode - Zahteve za žilavost materialov pri kriogenih temperaturah - 1.
del: Temperature pod –80 °C (ISO/DIS 21028-1:2024)
Cryogenic vessels - Toughness requirements for materials at cryogenic temperature -
Part 1: Temperatures below -80 degrees C (ISO/DIS 21028-1:2024)
Kryo-Behälter - Zähigkeitsanforderungen an Werkstoffe bei kryogenen Temperaturen -
Teil 1: Temperaturen unter −80 °C (ISO/DIS 21028-1:2024)
Récipients cryogéniques - Exigences de ténacité pour les matériaux à température
cryogénique - Partie 1: Températures inférieures à -80 degrés C (ISO/DIS 21028-
1:2024)
Ta slovenski standard je istoveten z: prEN ISO 21028-1
ICS:
23.020.40 Proti mrazu odporne posode Cryogenic vessels
(kriogenske posode)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 21028-1
ISO/TC 220
Cryogenic vessels — Toughness
Secretariat: AFNOR
requirements for materials at
Voting begins on:
cryogenic temperature —
2024-03-25
Part 1:
Voting terminates on:
2024-06-17
Temperatures below -80 degrees C
Récipients cryogéniques — Exigences de ténacité pour les
matériaux à température cryogénique —
Partie 1: Températures inférieures à -80 degrés C
ICS: 23.020.40
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
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PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
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Reference number
ISO/DIS 21028-1:2024(en)
DRAFT
ISO/DIS 21028-1:2024(en)
International
Standard
ISO/DIS 21028-1
ISO/TC 220
Cryogenic vessels — Toughness
Secretariat: AFNOR
requirements for materials at
Voting begins on:
cryogenic temperature —
Part 1:
Voting terminates on:
Temperatures below -80 degrees C
Récipients cryogéniques — Exigences de ténacité pour les
matériaux à température cryogénique —
Partie 1: Températures inférieures à -80 degrés C
ICS: 23.020.40
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2024
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
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WHICH REFERENCE MAY BE MADE IN
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Published in Switzerland Reference number
ISO/DIS 21028-1:2024(en)
ii
ISO/DIS 21028-1:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Toughness requirements . 1
4.1 General .1
4.2 Steels . . .2
4.3 Aluminium or aluminium alloys .2
4.4 Copper or copper alloys .2
4.5 Test methods .2
4.5.1 General .2
4.5.2 Test piece locations for plates .3
4.5.3 Test piece locations for welds and heat-affected zones .3
4.6 Acceptance criteria .5
4.6.1 For impact energy.5
4.6.2 For lateral expansion .5
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2014/68/EU (Pressure Equipment Directive) aimed to be
covered . 7
Bibliography . 8

iii
ISO/DIS 21028-1:2024(en)
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).
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 ISO/TC 220 Cryogenic vessels.
This third edition cancels and replaces the second edition (ISO 21028-1:2016), which has been technically
revised.
The main changes are as follows:
— Expansion of the Section 2: Normative references;
— Addition of Table 1 – Impact Energy and Lateral Expansion Requirements for Steels in Section 4.2: Steels.
A list of all parts in the ISO 21028 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/DIS 21028-1:2024(en)
Introduction
The use of materials at low temperatures entails special problems which are to be addressed. Consideration
is to be given, in particular, to changes in mechanical characteristics, expansion and contraction phenomena
and the thermal conduction of the various materials. Austenitic stainless steel can transform from the
austenitic to the martensitic phase when cooled down, leading to dimensional change that needs to be
considered during design.
However, the most important property to be considered is material toughness at low temperatures.

v
DRAFT International Standard ISO/DIS 21028-1:2024(en)
Cryogenic vessels — Toughness requirements for materials at
cryogenic temperature —
Part 1:
Temperatures below -80 degrees C
1 Scope
This part of ISO 21028 specifies the toughness requirements of metallic materials for use at a temperature
below -80 °C to ensure their suitability for cryogenic vessels.
This part of ISO 21028 is not applicable to unalloyed steels and cast materials.
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 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method
EN 10028-4, Flat products made of steels for pressure purposes — Part 4: Nickel alloy steels with specified low
temperature properties
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
minimum working temperature
lowest temperature likely to be reached by the vessel or by one of the vessel components during operation
4 Toughness requirements
4.1 General
The toughness of the materials used shall be either guaranteed by the material producer or verified by
conducting an impact test on each heat (lot) of the material in accordance with the requirements below.
Additionally, impact tests shall be performed on welded vessels as part of welding procedure qualification
and production weld tests as specified in the product standard.

ISO/DIS 21028-1:2024(en)
4.2 Steels
The materials used for the manufacture of the vessels, the welds and the heat-affected zone shall meet either
the minimum impact energy or lateral expansion values at minimum working temperature given in Table 1.
Nickel alloy steels shall meet the requirements of EN 10028-4.
Impact test requirements for cold stretched vessels shall meet
...