SIST EN ISO 21952:2025

Welding consumables - Wire electrodes, wires, rods and deposits for gas shielded arc welding of creep-resisting steels - Classification (ISO 21952:2025)

This document specifies requirements for classification of wire electrodes, wires and rods for gas shielded metal arc welding and tungsten inert-gas welding of creep-resisting steels, and for their deposits in the as-welded or post-weld heat-treated condition. One wire electrode can be tested and classified with different shielding gases.
This document is a combined specification providing for classification utilizing a system based upon the chemical composition of wire electrodes, wires and rods with requirements for yield strength and average impact energy of 47 J of all-weld metal, or utilizing a system based upon the tensile strength of the all-weld metal deposits and the chemical composition of wire electrodes, wires and rods.
a)       Clauses, subclauses and tables which carry the suffix “system A” are applicable only to wire electrodes, wires, rods and deposits classified in accordance with the system based upon the chemical composition with requirements for yield strength and the average impact energy of 47 J of all-weld metal deposits under this document.
b)       Clauses, subclauses and tables which carry the suffix “system B” are applicable only to wire electrodes, wires, rods and deposits classified in accordance with the system based upon the tensile strength of all‑weld metal deposits and the chemical composition of wire electrodes, wires and rods under this document.
c)        Clauses, subclauses and tables which do not have either the suffix “system A” or the “system B” are applicable to all wire electrodes, wires, rods and deposits classified under this document.

Schweißzusätze - Drahtelektroden, Drähte, Stäbe und Schweißgut zum Schutzgasschweißen von warmfesten Stählen - Einteilung (ISO 21952:2025)

Dieses Dokument legt Anforderungen zur Einteilung von Drahtelektroden, Drähten und Stäben für das Schutzgasschweißen und Wolfram-Inertgasschweißen von warmfesten Stählen fest sowie für ihr Schweißgut im Schweißzustand oder nach einer Wärmebehandlung. Eine Drahtelektrode kann mit unterschiedlichen Schutzgasen geprüft und entsprechend eingeteilt werden.
Dieses Dokument benutzt zur Einteilung ein kombiniertes System, das auf der Einteilung nach der chemischen Zusammensetzung der Drahtelektroden, Drähte und Stäbe mit Anforderungen an Streckgrenze und an die durchschnittliche Kerbschlagarbeit des reinen Schweißgutes von 47 J beruht oder auf der Zugfestigkeit des reinen Schweißgutes und der chemischen Zusammensetzung der Drahtelektroden, Drähte und Stäbe.
a)   Abschnitte, Unterabschnitte und Tabellen, die den Zusatz „System A“ tragen, sind nur für Drahtelektroden, Drähte, Stäbe und Schweißgut anwendbar, die nach dem System eingeteilt sind, das auf der chemischen Zusammensetzung mit Anforderungen an Streckgrenze und an die durchschnittliche Kerbschlagarbeit des reinen Schweißgutes von 47 J nach diesem Dokument beruht.
b)   Abschnitte, Unterabschnitte und Tabellen, die den Zusatz „System B“ tragen, sind nur für Drahtelektroden, Drähte, Stäbe und Schweißgut anwendbar, die nach dem System eingeteilt sind, das auf der Zugfestigkeit des reinen Schweißgutes und der chemischen Zusammensetzung der Drahtelektroden, Drähte und Stäbe nach diesem Dokument beruht.
c)   Abschnitte, Unterabschnitte und Tabellen, die weder den Zusatz „System A“ noch den Zusatz „System B“ tragen, sind für alle nach diesem Dokument eingeteilten Drahtelektroden, Drähte, Stäbe und Schweißgut anwendbar.

Produits consommables pour le soudage - Fils-électrodes, fils, baguettes et dépôts pour le soudage à l'arc sous gaz de protection des aciers résistant au fluage - Classification (ISO 21952:2025)

Le présent document spécifie les exigences relatives à la classification des fils-électrodes, des fils et des baguettes pour le soudage à l'arc avec électrode fusible sous protection gazeuse et pour le soudage TIG des aciers résistant au fluage, ainsi que pour leurs dépôts à l'état brut de soudage ou après traitement thermique après soudage. Un fil-électrode peut être soumis aux essais et classifié en utilisant différents gaz de protection.
Le présent document propose une spécification mixte permettant une classification utilisant soit un système basé sur la composition chimique des fils-électrodes, des fils et des baguettes, avec des exigences sur la limite d'élasticité et l'énergie de rupture moyenne de 47 J pour le métal fondu hors dilution, soit un système basé sur la résistance à la traction des dépôts de métal fondu hors dilution et la composition chimique des fils-électrodes, des fils et des baguettes.
a)       Les articles, les paragraphes et les tableaux qui portent le suffixe «système A» ne sont applicables qu'aux fils-électrodes, fils, baguettes et dépôts classifiés d'après le système basé sur la composition chimique avec des exigences sur la limite d'élasticité et l'énergie de rupture moyenne de 47 J du dépôt de métal fondu hors dilution conformément au présent document.
b)       Les articles, les paragraphes et les tableaux qui portent le suffixe «système B» ne sont applicables qu'aux fils-électrodes, fils, baguettes et dépôts classifiés d'après le système basé sur la résistance à la traction du métal fondu hors dilution et la composition chimique des fils-électrodes, des fils et des baguettes conformément au présent document.
c)        Les articles, les paragraphes et les tableaux qui ne portent ni le suffixe «système A», ni le suffixe «système B» sont applicables à tous les fils-électrodes, fils, baguettes et dépôts classifiés conformément au présent document.

Dodajni in pomožni materiali za varjenje - Žične elektrode, žice, palice in čisti vari za obločno varjenje v zaščitnem plinu za jekla, odporna proti lezenju - Razvrstitev (ISO 21952:2025)

General Information

• Status: Published
• Public Enquiry End Date: 02-Jul-2024
• Publication Date: 12-Oct-2025
• ICS: 25.160.20 - Welding consumables
• Technical Committee: VAR - Welding
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 29-Apr-2025
• Due Date: 04-Jul-2025
• Completion Date: 13-Oct-2025
• Ref Project: EN ISO 21952:2025 - Welding consumables - Wire electrodes, wires, rods and deposits for gas shielded arc welding of creep-resisting steels - Classification (ISO 21952:2025)

Relations

• Replaces: SIST EN ISO 21952:2012 - Welding consumables - Wire electrodes, wires, rods and deposits for gas-shielded arc welding of creep-resisting steels - Classification (ISO 21952:2012)
• Effective Date: 01-Nov-2025

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2025
Nadomešča:
SIST EN ISO 21952:2012
Dodajni in pomožni materiali za varjenje - Žične elektrode, žice, palice in čisti vari
za obločno varjenje v zaščitnem plinu za jekla, odporna proti lezenju - Razvrstitev
(ISO 21952:2025)
Welding consumables - Wire electrodes, wires, rods and deposits for gas shielded arc
welding of creep-resisting steels - Classification (ISO 21952:2025)
Schweißzusätze - Drahtelektroden, Drähte, Stäbe und Schweißgut zum
Schutzgasschweißen von warmfesten Stählen - Einteilung (ISO 21952:2025)
Produits consommables pour le soudage - Fils-électrodes, fils, baguettes et dépôts pour
le soudage à l'arc sous gaz de protection des aciers résistant au fluage - Classification
(ISO 21952:2025)
Ta slovenski standard je istoveten z: EN ISO 21952:2025
ICS:
25.160.20 Potrošni material pri varjenju Welding consumables
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 21952
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2025
EUROPÄISCHE NORM
ICS 25.160.20 Supersedes EN ISO 21952:2012
English Version
Welding consumables - Wire electrodes, wires, rods and
deposits for gas shielded arc welding of creep-resisting
steels - Classification (ISO 21952:2025)
Produits consommables pour le soudage - Fils- Schweißzusätze - Drahtelektroden, Drähte, Stäbe und
électrodes, fils, baguettes et dépôts pour le soudage à Schweißgut zum Schutzgasschweißen von warmfesten
l'arc sous gaz de protection des aciers résistant au Stählen - Einteilung (ISO 21952:2025)
fluage - Classification (ISO 21952:2025)
This European Standard was approved by CEN on 18 August 2024.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye 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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21952:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 21952:2025) has been prepared by Technical Committee ISO/TC 44 "Welding
and allied processes" in collaboration with Technical Committee CEN/TC 121 “Welding and allied
processes” 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 August 2025, and conflicting national standards shall
be withdrawn at the latest by August 2025.
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 ISO 21952:2012.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 21952:2025 has been approved by CEN as EN ISO 21952:2025 without any modification.

International
Standard
ISO 21952
Third edition
Welding consumables — Wire
2025-02
electrodes, wires, rods and
deposits for gas shielded arc
welding of creep-resisting steels —
Classification
Produits consommables pour le soudage — Fils-électrodes, fils,
baguettes et dépôts pour le soudage à l'arc sous gaz de protection
des aciers résistant au fluage — Classification
Reference number
ISO 21952:2025(en) © ISO 2025
ISO 21952:2025(en)
© ISO 2025
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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 21952:2025(en)
Contents Page
Foreword .iv
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification . 2
4.1 General .2
4.2 Classification systems .2
5 Symbols and requirements . 2
5.1 Symbol for the product or process .2
5.2 Symbol for the chemical composition of wire electrodes, wires, and rods .3
5.3 Symbol for the mechanical properties of all-weld metal .3
5.3.1 Classification by chemical composition – System A .3
5.3.2 Classification by tensile strength and chemical composition – System B . .3
5.4 Symbol for shielding gas .3
5.4.1 Classification by chemical composition – system A .3
5.4.2 Classification by tensile strength and chemical composition – system B .3
6 Mechanical tests .12
7 Preheating and interpass temperatures .12
8 Welding conditions and pass sequence .12
9 Chemical analysis . .13
10 Rounding procedure .13
11 Retest.13
12 Technical delivery conditions .13
13 Examples of designation .13
13.1 General . 13
13.2 Example 1 – Classification by chemical composition – system A . 13
13.3 Example 2 – Classification by tensile strength and chemical composition – system B .14
13.4 Example 3 – Classification by chemical composition – system A .14
13.5 Example 4 – Classification by tensile strength and chemical composition – system B .14
13.6 Example 5 – Classification by chemical composition – system A . 15
13.7 Example 6 – Classification by tensile strength and chemical composition – system B . 15
13.8 Example 7 – Classification by chemical composition – system A . 15
13.9 Example 8 – Classification by tensile strength and chemical composition – system B .16
Bibliography . 17

iii
ISO 21952:2025(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 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.
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