Cryogenic vessels - Toughness requirements for materials at cryogenic temperature - Part 2: Temperatures between -80 degrees C and -20 degrees C (ISO 21028-2:2018)

This European Standard specifies the toughness requirements of the metallic materials for use at a temperature between - 80 °C and - 20 °C ensuring suitability for use for the cryogenic vessels. Fine grain and low alloyed steels with specified yield strength <= 460 N/mm², aluminium and aluminium alloys, copper and copper alloys and austenitic stainless steels are covered by this standard.

Kryo-Behälter - Zähigkeitsanforderungen an Werkstoffe bei kryogenen Temperaturen - Teil 2: Temperaturen zwischen -80 °C und -20 °C (ISO 21028-2.2:2018)

Dieser Teil der ISO 21028 legt die Anforderungen an die Zähigkeit von metallischen Werkstoffen für die Verwendung bei Temperaturen zwischen − 20 °C und − 80 °C fest, um deren Eignung für den Einsatz für Kryo-Behälter sicherzustellen. Diese Norm gilt für Feinkornstähle und niedrig legierte Stähle mit einer festgelegten Streckgrenze ≤ 460 N/mm2, Aluminium und Aluminiumlegierungen, Kupfer und Kupferlegierungen sowie austenitische nichtrostende Stähle.

Récipients cryogéniques - Exigences de ténacité pour les matériaux à température cryogénique - Partie 2: Températures comprises entre -80 degrés C et -20 degrés C (ISO 21028-2:2018)

L'ISO 21028-2:2018 spécifie les exigences de ténacité des matériaux métalliques utilisables à une température comprise entre −20 °C et −80 °C pour assurer leur aptitude à l'emploi pour les récipients cryogéniques. Il est applicable aux aciers à grains fins et aux aciers faiblement alliés avec une limite d'élasticité spécifiée ≤ 460 N/mm2, à l'aluminium et aux alliages d'aluminium, au cuivre et aux alliages de cuivre et aux aciers austénitiques inoxydables.
NOTE       Pour les matériaux en acier répertoriés dans l'EN 13445‑2 ou l'EN 13480‑2 ou pour les matériaux en acier et les soudures conformes aux mêmes exigences fondamentales de sécurité, les exigences relatives à la prévention de la rupture fragile à basse température, conformément à l'EN 13445‑2:2014, Annexe B, méthode 2, ou à l'EN 13480‑2:2012, Annexe B, méthode 2 peuvent être appliquées.

Kriogene posode - Zahteve za žilavost materialov pri kriogenih temperaturah - 2. del: Temperature med –80 °C in –20 °C (ISO 21028-2:2018)

Ta evropski standard določa zahteve za žilavost kovinskih materialov, ki se uporabljajo pri temperaturah od –80 do –20 °C za zagotovitev njihove ustreznosti pri uporabi za kriogene posode. Ta standard zajema drobnozrnata in nizko legirana jekla s specifično natezno trdnostjo <= 460 N/mm², aluminij in aluminijeve zlitine, baker in bakrove zlitine ter avstenitna nerjavna jekla.

General Information

Status
Published
Public Enquiry End Date
14-Apr-2017
Publication Date
10-Jun-2018
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
22-Mar-2018
Due Date
27-May-2018
Completion Date
11-Jun-2018

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SLOVENSKI STANDARD
SIST EN ISO 21028-2:2018
01-julij-2018
1DGRPHãþD
SIST EN 1252-2:2002
Kriogene posode - Zahteve za žilavost materialov pri kriogenih temperaturah - 2.
del: Temperature med –80 °C in –20 °C (ISO 21028-2:2018)

Cryogenic vessels - Toughness requirements for materials at cryogenic temperature -

Part 2: Temperatures between -80 degrees C and -20 degrees C (ISO 21028-2:2018)

Kryo-Behälter - Zähigkeitsanforderungen an Werkstoffe bei kryogenen Temperaturen -

Teil 2: Temperaturen zwischen -80 °C und -20 °C (ISO 21028-2.2:2018)
Récipients cryogéniques - Exigences de ténacité pour les matériaux à température

cryogénique - Partie 2: Températures comprises entre -80 degrés C et -20 degrés C

(ISO 21028-2:2018)
Ta slovenski standard je istoveten z: EN ISO 21028-2:2018
ICS:
23.020.40 Proti mrazu odporne posode Cryogenic vessels
(kriogenske posode)
SIST EN ISO 21028-2:2018 en,fr,de

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

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SIST EN ISO 21028-2:2018
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SIST EN ISO 21028-2:2018
EN ISO 21028-2
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2018
EUROPÄISCHE NORM
ICS 23.020.40 Supersedes EN 1252-2:2001
English Version
Cryogenic vessels - Toughness requirements for materials
at cryogenic temperature - Part 2: Temperatures between
-80 degrees C and -20 degrees C (ISO 21028-2:2018)

Récipients cryogéniques - Exigences de ténacité pour Kryo-Behälter - Zähigkeitsanforderungen an

les matériaux à température cryogénique - Partie 2: Werkstoffe bei kryogenen Temperaturen - Teil 2:

Températures comprises entre -80 degrés C et -20 Temperaturen zwischen -80 °C und -20 °C (ISO 21028-

degrés C (ISO 21028-2:2018) 2.2:2018)
This European Standard was approved by CEN on 12 January 2018.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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

© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21028-2:2018 E

worldwide for CEN national Members.
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SIST EN ISO 21028-2:2018
EN ISO 21028-2:2018 (E)
Contents Page

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

Annex ZA (informative) Relationship between this European Standard and the Essential

Requirements of Directive 2014/68/EU of the European Parliament and of the
Council of 15 May 2014 on the harmonization of the laws of the Member States

relating to the making available on the market of pressure equipment .................................... 4

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SIST EN ISO 21028-2:2018
EN ISO 21028-2:2018 (E)
European foreword

This document (EN ISO 21028-2:2018) has been prepared by Technical Committee ISO/TC 220

"Cryogenic vessels" in collaboration with Technical Committee CEN/TC 268 “Cryogenic vessels and

specific hydrogen technologies applications”, the secretariat of which is held by AFNOR.

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 October 2018, and conflicting national standards shall

be withdrawn at the latest by October 2018.

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 1252-2:2001.

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association, and supports essential requirements of EU Directive(s).

For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this

document.

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, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO 21028-2:2018 has been approved by CEN as EN ISO 21028-2:2018 without any

modification.
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SIST EN ISO 21028-2:2018
EN ISO 21028-2:2018 (E)
Annex ZA
(informative)
Relationship between this European Standard and the Essential
Requirements of Directive 2014/68/EU of the European Parliament and of
the Council of 15 May 2014 on the harmonization of the laws of the Member
States relating to the making available on the market of pressure
equipment

This European Standard has been prepared under a Commission’s standardization request, M/071

Pressure Equipment, to provide one voluntary means of conforming to Essential Requirements of the

New Approach Directive 2014/68/EU “Pressure Equipment Directive” of the European Parliament and

of the Council of 15 May 2014.

Once this standard is cited in the Official Journal of the European Union under that Directive compliance

with the normative clauses of this standard given in Table ZA.1 confers, within the limits of the scope of

this standard, a presumption of conformity with the corresponding essential requirements of that

Directive, and associated EFTA regulations.

Table ZA.1 — Correspondence between this European Standard and Directive 2014/68/EU of

the European Parliament and of the Council of 15 May 2014
Essential Requirements of Clause(s)/sub-clause(s) of this
Remarks/Notes
Directive 2014/68/EU EN
Annex I § 2.2.3 b) All clauses Impact strength
Annex I § 7.5 All clauses Material characteristics

WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European

Standard is maintained in the list published in the Official Journal of the European Union. Users of this

standard should consult frequently the latest list published in the Official Journal of the European

Union.

WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of

this standard.
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SIST EN ISO 21028-2:2018
INTERNATIONAL ISO
STANDARD 21028-2
Second edition
2018-03
Cryogenic vessels — Toughness
requirements for materials at
cryogenic temperature —
Part 2:
Temperatures between -80 degrees C
and -20 degrees C
Récipients cryogéniques — Exigences de ténacité pour les matériaux
à température cryogénique —
Partie 2: Températures comprises entre -80 degrés C et -20 degrés C
Reference number
ISO 21028-2:2018(E)
ISO 2018
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SIST EN ISO 21028-2:2018
ISO 21028-2:2018(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
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SIST EN ISO 21028-2:2018
ISO 21028-2:2018(E)
Contents Page

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

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

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

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Symbols .......................................................................................................................................................................................................................... 2

5 Requirements for steels with specified yield strength ≤460 N/mm ............................................................3

5.1 General ........................................................................................................................................................................................................... 3

5.2 Temperature adjustments ............................................................................................................................................................. 4

5.3 Procedure for base material <10 mm thick ......... ........................................................................................................... 4

6 General test requirements ......................................................................................................................................................................... 5

6.1 General ........................................................................................................................................................................................................... 5

6.2 Sub-sized specimens .......................................................................................................................................................................... 5

6.3 Sub-sized specimens for components from which it is impossible to extract

specimens of section size equal to reference thickness ...................................................................................... 5

7 Welds ................................................................................................................................................................................................................................6

8 Requirements for aluminium and aluminium alloys, copper and copper alloys and

austenitic stainless steels ............................................................................................................................................................................6

Annex A (informative) Case proposal — Technical justification for temperature

adjustment term ................................................................................................................................................................................................19

Annex B (informative) Example of calculation of the lowest temperature authorized

during operation ...............................................................................................................................................................................................22

Bibliography .............................................................................................................................................................................................................................23

© ISO 2018 – All rights reserved iii
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SIST EN ISO 21028-2:2018
ISO 21028-2:2018(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.
This document was prepared by Technical Committee ISO/TC 220, Cryogenic vessels.

This second edition cancels and replaces the first edition (ISO 21028-2:2004), which has been

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

— tables and figures on impact test temperatures and design reference have been modified;

— Annex B has been added to present an example of calculation of the lowest temperature authorized

during operation.
A list of all parts in the ISO 21028 series can be found on the ISO website.
iv © ISO 2018 – All rights reserved
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SIST EN ISO 21028-2:2018
ISO 21028-2:2018(E)
Introduction

The use of materials at low temperatures entails special problems which should be addressed.

Consideration should be given, in particular, to changes in mechanical characteristics, expansion and

contraction phenomena and the thermal conduction of the various materials. The most important

property to be considered is the material toughness at low temperature.
© ISO 2018 – All rights reserved v
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SIST EN ISO 21028-2:2018
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SIST EN ISO 21028-2:2018
INTERNATIONAL STANDARD ISO 21028-2:2018(E)
Cryogenic vessels — Toughness requirements for materials
at cryogenic temperature —
Part 2:
Temperatures between -80 degrees C and -20 degrees C
1 Scope

This document specifies the toughness requirements of metallic materials for use at temperatures

between −20 °C and −80 °C to ensure their suitability for cryogenic vessels. This document is applicable

to fine-grain and low-alloyed steels with specified yield strength ≤460 N/mm , aluminium and

aluminium alloys, copper and copper alloys and austenitic stainless steels.

NOTE For steel materials listed in EN 13445-2 or EN 13480-2 or for steel materials and weldings complying

with the same fundamental safety requirements, the requirements for prevention of brittle fracture at low

temperatures according to EN 13445-2:2014, Annex B, method 2, or EN 13480-2:2012, Annex B, method 2 can be

applied.
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 (all parts), Metallic materials — Charpy pendulum impact test

ISO 9016, Destructive tests on welds in metallic materials — Impact tests — Test specimen location, notch

orientation and examination
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

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

— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at https:// www .iso .org/ obp
3.1
minimum metal temperature
lowest temperature defined for each of the conditions:
— temperature during normal operation;
— temperature during start-up and shut down procedures;
— temperature which may occur during possible process upsets;
— temperature which may occur during pressure or leak testing;
— ambient conditions.
© ISO 2018 – All rights reserved 1
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SIST EN ISO 21028-2:2018
ISO 21028-2:2018(E)

Note 1 to entry: See also temperature adjustment term (3.2) and design reference temperature (3.3).

3.2
temperature adjustment term

term relevant to the calculation of the design reference temperature, T (3.3) and dependent on the

pressure-induced principal membrane stress at the appropriate minimum metal temperature

3.3
design reference temperature

temperature used for determining the impact energy requirements themselves, determined by adding

the temperature adjustment term, T (3.2) to the minimum metal temperature, T (3.1):

S M
TT=+T
RM S

Note 1 to entry: All applicable combinations of the temperatures T and T are to be considered and the lowest

M S

possible T value used for the determination of the required material impact test temperature (3.4).

3.4
impact test temperature
temperature at which the required impact energy has to be achieved
Note 1 to entry: See Clause 5.
3.5
impact energy
energy determined from Charpy V-notch tests

Note 1 to entry: These tests are performed in accordance with ISO 148 (all parts).

3.6
reference thickness

thickness of a component used to relate the design reference temperature, T (3.3) of the component

with its required impact test temperature, T (3.4)

Note 1 to entry: The reference thickness is based on the nominal thickness (including corrosion allowance) and

can be as defined in Table 6. For butt-welded components, it is the nominal wall thickness of the component at the

edge of the weld preparation.
Note 2 to entry: See Figures 1 to 5.
4 Symbols
Symbol Definition Unit
A-W as-welded
a depth of the defect mm
e wall thickness mm
e reference thickness mm
KV impact energy J
2 © ISO 2018 – All rights reserved
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SIST EN ISO 21028-2:2018
ISO 21028-2:2018(E)
K stress intensity factor J
K critical stress intensity J
K constant 25 MPa√m
PWHT post-welded heat-treatment
R yield point N/mm or J
R proof stress N/mm or J
SMYS specified minimum yield strength N/mm
t component thickness mm
T impact test temperature °C
T minimum metal temperature °C
T design reference temperature °C
T temperature adjustment term °C
β constant 1/60
σ stress coefficient
π coefficient
ΔT correction term °C
5 Requirements for steels with specified yield strength ≤460 N/mm
5.1 General

This method, based on fracture mechanics, may be used to determine the requirements to avoid brittle

fracture in C, CMn, fine-grain and low-alloy steels with a SMYS ≤460 N/mm .

In this procedure, the impact test temperature, T , is not equal to the design reference temperature, T .

KV R

Parent material, welds and heat-affected zones shall meet the impact energy (KV) and impact test

temperature, T , requirements given in Table 1 for design refe
...

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