SIST EN ISO 17633:2025
(Main)Welding consumables - Tubular cored electrodes and rods for gas shielded and non-gas shielded metal arc welding of stainless and heat-resisting steels - Classification (ISO 17633:2025)
Welding consumables - Tubular cored electrodes and rods for gas shielded and non-gas shielded metal arc welding of stainless and heat-resisting steels - Classification (ISO 17633:2025)
ISO 17633:2017 specifies requirements for classification of tubular flux and metal cored electrodes and rods, based on the all-weld metal chemical composition, the type of core, shielding gas, welding position and the all-weld metal mechanical properties, in the as-welded or heat-treated conditions, for gas shielded and non-gas shielded metal arc welding of stainless and heat-resisting steels.
ISO 17633:2017 is a combined standard providing for classification utilizing a system based upon nominal composition or utilizing a system based upon alloy type.
a) Clauses, subclauses, and tables which carry the suffix letter "A" are applicable only to products classified using the system based upon nominal composition.
b) Clauses, subclauses, and tables which carry the suffix letter "B" are applicable only to products classified using the system based upon alloy type.
c) Clauses, subclauses, and tables which do not have either the suffix letter "A" or the suffix letter "B" are applicable to all products classified in accordance with this document.
ISO 17633:2017 does not use pulsed current for determining the product classification.
Schweißzusätze - Fülldrahtelektroden und Füllstäbe zum Metall-Lichtbogenschweißen mit und ohne Gasschutz von nichtrostenden und hitzebeständigen Stählen - Einteilung (ISO 17633:2025)
Dieses Dokument legt Anforderungen für die Einteilung von Fülldrahtelektroden und Füllstäben zum Metall-Lichtbogenschweißen mit oder ohne Gasschutz von nichtrostenden und hitzebeständigen Stählen fest; die Einteilung beruht auf der chemischen Zusammensetzung des reinen Schweißgutes, der Art der Füllung, dem Schutzgas, der Schweißposition und den mechanischen Eigenschaften des reinen Schweißgutes im Schweißzustand oder nach einer Wärmenachbehandlung.
Dieses Dokument ist eine kombinierte Norm und benutzt zur Einteilung ein System entsprechend der nominellen Zusammensetzung oder entsprechend dem Legierungstyp.
a) Abschnitte, Unterabschnitte und Tabellen mit einem nachgestellten „System A“ sind nur für solche Produkte anwendbar, die nach dem System auf Basis der nominellen Zusammensetzung eingeteilt sind.
b) Abschnitte, Unterabschnitte und Tabellen mit einem nachgestellten „System B“ sind nur für solche Produkte anwendbar, die nach dem System auf Basis des Legierungstyps eingeteilt sind.
c) Abschnitte, Unterabschnitte und Tabellen, die kein nachgestelltes „System A“ oder „System B“ enthalten, sind für alle nach diesem Dokument eingeteilten Produkte anwendbar.
Dieses Dokument verwendet zur Bestimmung der Produkteinteilung keinen pulsierenden Strom und es wird auch nicht auf Ferritnummern eingegangen (siehe Anhang D und ISO/TR 22824).
Produits consommables pour le soudage - Fils et baguettes fourrés pour le soudage à l'arc avec ou sans protection gazeuse des aciers inoxydables et des aciers résistant aux températures élevées - Classification (ISO 17633:2025)
Le présent document spécifie les exigences de classification des fils et baguettes fourrés de flux ou de métal, en fonction de la composition chimique du métal fondu hors dilution, du type fourrage, du gaz de protection, de la position de soudage et des caractéristiques mécaniques du métal fondu hors dilution, à l'état brut de soudage ou après traitement thermique après soudage, pour le soudage à l'arc avec ou sans protection gazeuse des aciers inoxydables et résistant aux températures élevées.
Le présent document est une norme mixte fournissant une classification utilisant un système basé sur la composition nominale ou utilisant un système basé sur le type d'alliage.
a) Les articles, paragraphes et tableaux qui portent la lettre «Système A» ne sont applicables qu'aux produits classifiés selon le système basé sur la composition nominale.
b) Les articles, paragraphes et tableaux qui portent la lettre «Système B» ne sont applicables qu'aux produits classifiés selon le système basé sur le type d'alliage.
c) Les articles, paragraphes et tableaux qui ne portent ni la lettre «Système A», ni «Système B» sont applicables à tous les produits classifiés conformément au présent document.
Le présent document n’utilise pas le courant pulsé pour la détermination de la classification des produits, il ne traite pas non plus des indices de ferrite (voir l'Annexe D et l'ISO/TR 22824).
Dodajni in pomožni materiali za varjenje - Strženske žice in palice za obločno varjenje v zaščitnem plinu in brez zaščite za nerjavna in ognjeodporna jekla - Razvrstitev (ISO 17633:2025)
Ta dokument določa zahteve za razvrstitev strženskih žic in palic na osnovi kemične sestave čistega vara, vrste stržena, zaščitnega plina, položaja varjenja ter mehanskih lastnosti čistega vara v varjenem stanju ali stanju s toplotno obdelavo za obločno varjenje v zaščitnem plinu in brez zaščite za nerjavna in ognjeodporna jekla.
Ta dokument je kombinirani standard, ki omogoča razvrstitev po sistemu na osnovi nominalne sestave ali vrste zlitine.
a) Točke, podtočke in preglednice z dodanim besedilom »sistem A« se uporabljajo samo za izdelke, ki so razvrščeni po sistemu na osnovi nominalne sestave.
b) Točke, podtočke in preglednice z dodanim besedilom »sistem B« se uporabljajo samo za izdelke, ki so razvrščeni po sistemu na osnovi vrste zlitine.
c) Točke, podtočke in preglednice brez dodanega besedila »sistem A« oziroma »sistem B« se uporabljajo za vse izdelke, ki so razvrščeni v skladu s tem dokumentom.
Za določanje razvrstitve izdelkov v tem dokumentu se ne uporablja udarni tok niti v njem niso obravnavana feritna števila (glej dodatek D in standard ISO/TR 22824).
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2025
Nadomešča:
SIST EN ISO 17633:2018
SIST EN ISO 17633:2018/A1:2021
Dodajni in pomožni materiali za varjenje - Strženske žice in palice za obločno
varjenje v zaščitnem plinu in brez zaščite za nerjavna in ognjeodporna jekla -
Razvrstitev (ISO 17633:2025)
Welding consumables - Tubular cored electrodes and rods for gas shielded and non-gas
shielded metal arc welding of stainless and heat-resisting steels - Classification (ISO
17633:2025)
Schweißzusätze - Fülldrahtelektroden und Füllstäbe zum Metall-Lichtbogenschweißen
mit und ohne Gasschutz von nichtrostenden und hitzebeständigen Stählen - Einteilung
(ISO 17633:2025)
Produits consommables pour le soudage - Fils et baguettes fourrés pour le soudage à
l'arc avec ou sans protection gazeuse des aciers inoxydables et des aciers résistant aux
températures élevées - Classification (ISO 17633:2025)
Ta slovenski standard je istoveten z: EN ISO 17633:2025
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 17633
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2025
EUROPÄISCHE NORM
ICS 25.160.20 Supersedes EN ISO 17633:2018, EN ISO
17633:2018/A1:2021
English Version
Welding consumables - Tubular cored electrodes and rods
for gas shielded and non-gas shielded metal arc welding of
stainless and heat-resisting steels - Classification (ISO
17633:2025)
Produits consommables pour le soudage - Fils et Schweißzusätze - Fülldrahtelektroden und Füllstäbe
baguettes fourrés pour le soudage à l'arc avec ou sans zum Metall-Lichtbogenschweißen mit und ohne
protection gazeuse des aciers inoxydables et des aciers Gasschutz von nichtrostenden und hitzebeständigen
résistant aux températures élevées - Classification (ISO Stählen - Einteilung (ISO 17633:2025)
17633:2025)
This European Standard was approved by CEN on 18 June 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 17633:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 17633:2025) 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 September 2025, and conflicting national standards
shall be withdrawn at the latest by September 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 17633:2018.
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 17633:2025 has been approved by CEN as EN ISO 17633:2025 without any modification.
International
Standard
ISO 17633
Fourth edition
Welding consumables — Tubular
2025-03
cored electrodes and rods for gas
shielded and non-gas shielded
metal arc welding of stainless
and heat-resisting steels —
Classification
Produits consommables pour le soudage — Fils et baguettes
fourrés pour le soudage à l'arc avec ou sans protection gazeuse
des aciers inoxydables et des aciers résistant aux températures
élevées — Classification
Reference number
ISO 17633:2025(en) © ISO 2025
ISO 17633:2025(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
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ISO copyright office
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CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 17633:2025(en)
Contents Page
Foreword .iv
Introduction .v
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 General .2
5.2 Symbol for the product .3
5.2.1 Classification according to nominal composition – System A .3
5.2.2 Classification according to alloy type – System B .3
5.3 Symbol for the chemical composition of all-weld metal .3
5.3.1 Classification according to nominal composition – System A .3
5.3.2 Classification according to alloy type – System B .3
5.4 Symbol for type of core .18
5.5 Symbol for shielding gas .18
5.6 Symbol for welding position .19
6 Mechanical test . 19
6.1 General .19
6.2 Preheating and interpass temperatures . 20
6.3 Pass sequence .21
7 Chemical analysis . .21
8 Rounding procedure .21
9 Retests .21
10 Technical delivery conditions .21
11 Examples of designation .22
11.1 General . 22
11.2 Example 1 – Classification according to nominal composition – System A . 22
11.3 Example 2 - Classification according to alloy type – System B . 22
11.4 Example 3 – Z Classification according to nominal composition – System A . 22
Annex A (informative) Comparison charts of alloy designation according to nominal
composition and alloy type . .24
Annex B (informative) Description core types — Classification according to nominal
composition .26
Annex C (informative) Description of types of tubular cored electrodes and rods —
Classification according to alloy type.27
Annex D (informative) Considerations on weld metal ferrite contents .28
Bibliography .31
iii
ISO 17633:2025(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.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 44, Welding and allied processes, Subcommittee
SC 3, Welding consumables, in collaboration with the European Committee for Standardization (CEN)
Technical Committee CEN/TC 121, Welding and allied processes, in accordance with the Agreement on
technical cooperation between ISO and CEN (Vienna Agreement).
This fourth edition cancels and replaces the third edition (ISO 17633:2017) which has been technically
revised. It also incorporates the Amendment ISO 17633:2017/Amd 1:2021
The main changes are as follows:
— document has been reformatted in single column showing System A and System B in tables and separate
clauses and subclauses, some which are new;
— normative references have been updated;
— new footnotes have been added to Tables 2 to 6 regarding specialized applications;
— 0,50 maximum cobalt has been added to all classifications in Tables 2 to 6;
— compositions of 16 8 2 and 19 9 H and 25 4 have been updated in Tables 4 and 5;
— examples in Clause 11 have been updated.
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. Official interpretations of ISO/TC 44 documents, where they exist, are
available from this page: https://committee.iso.org/sites/tc44/home/interpretation.html.
iv
ISO 17633:2025(en)
Introduction
This document provides a classification system for tubular cored electrodes and rods for welding stainless
and heat resisting steels.
It recognizes that there are two somewhat different approaches in the global market to classifying a given
tubular stainless steel welding consumable, and allows for either or both to be used, to suit a particular
market need. Application of either type of classification designation (or of both, where suitable) identifies a
product as classified in accordance with this document. The classification in accordance with system A was
mainly based on EN 12073:1999 which has been withdrawn and replaced by this standard. The classification
in accordance with system B is mainly based upon standards used around the Pacific Rim.
v
International Standard ISO 17633:2025(en)
Welding consumables — Tubular cored electrodes and rods
for gas shielded and non-gas shielded metal arc welding of
stainless and heat-resisting steels — Classification
1 Scope
This document specifies requirements for classification of tubular flux and metal cored electrodes and rods,
based on the all-weld metal chemical composition, the type of core, shielding gas, welding position and the
all-weld metal mechanical properties, in the as-welded or heat-treated conditions, for gas shielded and non-
gas shielded metal arc welding of stainless and heat-resisting steels.
This document is a combined standard providing for classification utilizing a system based upon nominal
composition or utilizing a system based upon alloy type.
a) Clauses, subclauses, and tables which carry the suffix “System A” are applicable only to products
classified using the system based upon nominal composition.
b) Clauses, subclauses, and tables which carry the suffix “System B” are applicable only to products
classified using the system based upon alloy type.
c) Clauses, subclauses, and tables which do not have either the suffix “System A” or “System B” are
applicable to all products classified in accordance with this document.
This document does not use pulsed current for determining the product classification, neither does it
address ferrite numbers (see Annex D and ISO/TR 22824).
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 544, Welding consumables — Technical delivery conditions for filler materials and fluxes — Type of product,
dimensions, tolerances and markings
ISO 6847, Welding consumables — Deposition of a weld metal pad for chemical analysis
ISO 6947:2019, Welding and allied processes — Welding positions
ISO 13916, Welding — Guidance on the measurement of preheating temperature, interpass temperature and
preheat maintenance temperature
ISO 14175, Welding consumables — Gases and gas mixtures for fusion welding and allied processes
ISO 14344, Welding consumables — Procurement of filler materials and fluxes
ISO 15792-1:2020, Welding consumables — Test methods — Part 1: Preparation of all-weld metal test pieces
and specimens in steel, nickel and nickel alloys
ISO 80000-1:2022, Quantities and units — Part 1: General
3 Terms and definitions
No terms and definitions are listed in this document.
ISO 17633:2025(en)
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/
4 Classification
4.1 General
Classification designations are based upon two approaches to indicate the chemical composition of the all-
weld metal deposit obtained with a given electrode or rod.
The “nominal composition” approach uses designation components indicating directly the nominal levels
of certain alloying elements, given in a particular order, and some symbols for low but significant levels of
other elements, whose levels are not conveniently expressed as integers. The “alloy type” approach uses
tradition-based three- or four-digit designations for alloy families, and an occasional additional character or
characters for compositional modifications of each original alloy within the family.
This clause includes the symbols for the type of product, the chemical composition of all-weld metal, the
type of core, the shielding gas and the welding position, in accordance with the symbols defined in Clause 5.
In most cases, a given commercial product can be classified in both systems. Then either or both classification
designations can be used for the product.
4.2 Classification systems
Each classification system, A and B, is split into five parts as given in Table 1.
Table 1 — Parts of the classification systems, A and B
Classification system
Part of
classification
System A System B
designation
Classification according to nominal composition Classification according to alloy type
symbol indicating the product to be identified (see symbol indicating the tubular cored electrode and
5.2); rod (see 5.2);
symbol indicating the chemical composition of the symbol indicating the chemical composition of the
2 all-weld metal all-weld metal
(see Table 2); (see Table 3 to Table 6);
3 symbol indicating the type of core (see Table 9); symbol indicating the type of core (see Table 10);
4 symbol indicating the shielding gas (see 5.5);
5 symbol indicating the welding position (see Table 11).
The full identification (see Clause 10 and examples in Clause 11) shall be used on packages and in the
manufacturer’s literature and data sheets.
5 Symbols and requirements
5.1 General
A given tubular cored electrode may be classified with more than one shielding gas. In such cases, each
shielding gas results in a separate classification.
ISO 17633:2025(en)
5.2 Symbol for the product
5.2.1 Classification according to nominal composition – System A
The symbol for tubular cored product used in the metal arc welding process shall be the letter “T”.
5.2.2 Classification according to alloy type – System B
The symbol for tubular cored product used in the metal arc welding process shall be the letters “TS”. The
initial letter, where:
a) T indicates tubular cored electrode or rod as distinguished from covered electrodes and from solid
electrodes and rods;
b) S indicates that the alloy system is stainless or heat-resisting steel.
5.3 Symbol for the chemical composition of all-weld metal
5.3.1 Classification according to nominal composition – System A
The symbols in Table 2 identify the chemical composition of all-weld metal determined in accordance with
Clause 7.
The all-weld metal obtained with the tubular cored product in Table 2 under conditions given in Clause 6
shall also fulfil the requirements given in Table 7. (See Annex A.)
5.3.2 Classification according to alloy type – System B
The symbols in Table 3 identify the chemical composition of all-weld metal for gas shielded flux cored
electrodes determined in accordance with Clause 7.
The symbols in Table 4 identify the chemical composition of all-weld metal for non-gas shielded flux cored
electrodes determined in accordance with Clause 7.
The symbols in Table 5 identify the chemical composition of all-weld metal for gas shielded metal cored
electrodes determined in accordance with Clause 7.
The symbols in Table 6 identify the chemical composition of all-weld metal for cored products for gas
tungsten arc welding determined in accordance with Clause 7.
The all-weld metal obtained with the tubular cored electrodes and rods in Table 3, Table 4, Table 5 and
Table 6 under conditions given in Clause 6 shall also fulfil the requirements given in Table 8. (See Annex A.).
ISO 17633:2025(en)
Table 2 — Symbols and all-weld metal chemical composition requirements – Classification according to nominal composition – System A
a,b
Alloy Chemical composition, % (by mass)
designation
according to
c c d e
C Mn Si P S Cr Ni Mo Nb + Ta Cu Co N Others
nominal
composition
Martensitic/ferritic types
13 0,12 1,5 1,0 0,030 0,025 11,0 to 14,0 0,3 0,3 — 0,5 0,50 — —
Ti: 10 × C
13 Ti 0,10 0,80 1,0 0,030 0,030 10,5 to 13,0 0,3 0,3 — 0,5 0,50 —
to 1,5
13 4 0,06 1,5 1,0 0,030 0,025 11,0 to 14,5 3,0 to 5,0 0,4 to 1,0 — 0,5 0,50 — —
17 0,12 1,5 1,0 0,030 0,025 16,0 to 18,0 0,3 0,3 — 0,5 0,50 — —
Austenitic types
19 9 L 0,04 2,0 1,2 0,030 0,025 18,0 to 21,0 9,0 to 11,0 0,3 — 0,5 0,50 — —
19 9 Nb 0,08 2,0 1,2 0,030 0,025 18,0 to 21,0 9,0 to 11,0 0,3 8 × C to 1,1 0,5 0,50 — —
19 12 3 L 0,04 2,0 1,2 0,030 0,025 17,0 to 20,0 10,0 to 13,0 2,5 to 3,0 — 0,5 0,50 — —
19 12 3 Nb 0,08 2,0 1,2 0,030 0,025 17,0 to 20,0 10,0 to 13,0 2,5 to 3,0 8 × C to 1,1 0,5 0,50 — —
Ferritic-austenitic types (sometimes referred to as austenitic-ferritic types)
22 9 3 N L 0,04 2,5 1,2 0,030 0,025 21,0 to 24,0 7,5 to 10,5 2,5 to 4,0 — 0,5 0,50 0,08 to 0,20 —
23 7 N L 0,04 0,4 to 1,5 1,0 0,030 0,020 22,5 to 25,5 6,5 to 10,0 0,8 — 0,5 0,50 0,10 to 0,20 —
25 9 4 N L 0,04 2,5 1,2 0,030 0,025 24,0 to 27,0 8,0 to 10,5 2,5 to 4,5 — — 0,50 0,20 to 0,30 —
25 9 4 Cu N L 0,04 2,5 1,2 0,030 0,025 24,0 to 27,0 8,0 to 10,5 2,5 to 4,5 — 1,0 to 2,5 0,50 0,20 to 0,30 —
Fully austenitic types
f
18 16 5 N L 0,03 1,0 to 4,0 1,0 0,03 0,02 17,0 to 20,0 16,0 to 19,0 3,5 to 5,0 — 0,5 0,50 0,10 to 0,20 —
f
19 13 4 N L 0,04 1,0 to 5,0 1,2 0,030 0,025 17,0 to 20,0 12,0 to 15,0 3,0 to 4,5 — 0,5 0,50 0,08 to 0,20 —
f
20 25 5 Cu N L 0,03 1,0 to 4,0 1,0 0,03 0,02 19,0 to 22,0 24,0 to 27,0 4,0 to 6,0 — 1,0 to 2,0 0,50 0,10 to 0,20 —
Special types — Often used for dissimilar metal joining
18 8 Mn 0,20 4,5 to 7,5 1,2 0,035 0,025 17,0 to 20,0 7,0 to 10,0 0,3 — 0,5 0,50 — —
18 9 Mn Mo 0,04 to 0,14 3,0 to 5,0 1,2 0,035 0,025 18,0 to 21,5 9,0 to 11,0 0,5 to 1,5 — — 0,50 — —
a
Single values are maximum values.
b
“No requirement for analysis” is indicated by a dash.
c
The sum of P and S shall not exceed 0,050 % (by mass), except for 18 16 5 N L, 18 8 Mn, and 29 9.
d
Up to 20 % (by mass) of the amount of Nb can be replaced by Ta.
e
For certain specialized applications, including but not limited to medical and nuclear power applications, a significantly lower Co limit than 0,50 % may be necessary. A lower limit should be specified in the purchase order in
accordance with ISO 14344.
f
The all-weld metal is in most cases fully austenitic and therefore can be susceptible to microfissuring or hot cracking. The occurrence of fissuring or cracking is reduced by increasing the weld metal manganese level and in
recognition of this the manganese range is extended for a number of grades.
g
Consumables for which the chemical composition is not listed shall be symbolized similarly and prefixed by the letter Z. The chemical composition ranges are not specified, and it is possible that two products with the same
Z classification are not interchangeable.
ISO 17633:2025(en)
Table 2 (continued)
20 10 3 0,08 2,5 1,2 0,035 0,025 19,5 to 22,0 9,0 to 11,0 2,0 to 4,0 — 0,5 0,50 — —
23 12 L 0,04 2,5 1,2 0,030 0,025 22,0 to 25,0 11,0 to 14,0 0,3 — 0,5 0,50 — —
10 × C
23 12 Nb 0,08 1,0 to 2,5 1,0 0,03 0,02 22,0 to 25,0 11,0 to 14,0 0,3 0,5 0,50 — —
to 1,0
23 12 2 L 0,04 2,5 1,2 0,030 0,025 22,0 to 25,0 11,0 to 14,0 2,0 to 3,0 — 0,5 0,50 — —
29 9 0,15 2,5 1,2 0,035 0,025 27,0 to 31,0 8,0 to 12,0 0,3 — 0,5 0,50 — —
Heat-resisting types
a,b
Alloy Chemical composition, % (by mass)
designation
according to
c c d e
C Mn Si P S Cr Ni Mo Nb + Ta Cu Co N Others
nominal
composition
16 8 2 0,10 1,0 to 2,5 1,0 0,03 0,02 14,5 to17,5 7,5 to 9,5 1,0 to 2,5 — 0,5 0,50 — Cr+Mo: 18,5
19 9 H 0,04 to 0,08 1,0 to 2,5 1,0 0,03 0,02 18,0 to 21,0 9,0 to 11,0 0,3 — 0,5 0,50 — —
21 10 N 0,06 to 0,09 0,3 to 1,0 1,0 to 2,0 0,02 0,01 20,5 to 22,5 9,5 to 11,0 0,5 — 0,5 0,50 0,10 to 0,20 Ce: 0,05
22 12 H 0,15 2,5 1,2 0,030 0,025 20,0 to 23,0 10,0 to 13,0 0,3 — 0,5 0,50 — —
25 4 0,15 1,0 to 2,5 2,0 0,03 0,02 24,0 to 27,0 4,0 to 6,0 0,3 — 0,5 0,50 — —
f
25 20 0,06 to 0,20 1,0 to 5,0 1,2 0,030 0,025 23,0 to 27,0 18,0 to 22,0 0,3 — 0,5 0,50 — —
Other compositions
g
Z Any other agreed composition
a
Single values are maximum values.
b
“No requirement for analysis” is indicated by a dash.
c
The sum of P and S shall not exceed 0,050 % (by mass), except for 18 16 5 N L, 18 8 Mn, and 29 9.
d
Up to 20 % (by mass) of the amount of Nb can be replaced by Ta.
e
For certain specialized applications, including but not limited to medical and nuclear power applications, a significantly lower Co limit than 0,50 % may be necessary. A lower limit should be specified in the purchase order in
accordance with ISO 14344.
f
The all-weld metal is in most cases fully austenitic and therefore can be susceptible to microfissuring or hot cracking. The occurrence of fissuring or cracking is reduced by increasing the weld metal manganese level and in
recognition of this the manganese range is extended for a number of grades.
g
Consumables for which the chemical composition is not listed shall be symbolized similarly and prefixed by the letter Z. The chemical composition ranges are not specified, and it is possible that two products with the same
Z classification are not interchangeable.
ISO 17633:2025(en)
Table 3 — Symbols and all-weld metal chemical composition requirements of gas shielded flux cored electrodes – Classification according
to alloy type – System B
a,b
Chemical composition, % (by mass)
Alloy
designation
Typical shield-
according
ing
c d
C Mn Si P S Cr Ni Mo Nb + Ta Cu Co N Others
to alloy
gas
type
(see 5.5)
C1, M12,
307 0,13 3,30 to 4,75 1,0 0,04 0,03 18,0 to 20,5 9,0 to 10,5 0,5 to 1,5 — 0,75 0,50 — —
M21, Z
C1, M12,
308 0,08 0,5 to 2,5 1,0 0,04 0,03 18,0 to 21,0 9,0 to 11,0 0,75 — 0,75 0,50 — —
M21, Z
C1, M12,
308L 0,04 0,5 to 2,5 1,0 0,04 0,03 18,0 to 21,0 9,0 to 12,0 0,75 — 0,75 0,50 — —
M21, Z
C1, M12,
308H 0,04 to 0,08 0,5 to 2,5 1,0 0,04 0,03 18,0 to 21,0 9,0 to 11,0 0,75 — 0,75 0,50 — —
M21, Z
C1, M12,
308Mo 0,08 0,5 to 2,5 1,0 0,04 0,03 18,0 to 21,0 9,0 to 11,0 2,0 to 3,0 — 0,75 0,50 — —
M21, Z
C1, M12,
308LMo 0,04 0,5 to 2,5 1,0 0,04 0,03 18,0 to 21,0 9,0 to 12,0 2,0 to 3,0 — 0,75 0,50 — —
M21, Z
C1, M12, 0,12 to
308N 0,10 1,0 to 4,0 1,0 0,04 0,03 20,0 to 25,0 7,0 to 11,0 0,5 — 0,5 0,50
M21, Z 0,30
C1, M12,
309 0,10 0,5 to 2,5 1,0 0,04 0,03 22,0 to 25,0 12,0 to 14,0 0,75 — 0,75 0,50 — —
M21, Z
C1, M12,
309L 0,04 0,5 to 2,5 1,0 0,04 0,03 22,0 to 25,0 12,0 to 14,0 0,75 — 0,75 0,50 — —
M21, Z
C1, M12,
309H 0,04 to 0,10 0,5 to 2,5 1,0 0,04 0,03 22,0 to 25,0 12,0 to 14,0 0,75 — 0,75 0,50 — —
M21, Z
C1, M12,
309Mo 0,12 0,5 to 2,5 1,0 0,04 0,03 21,0 to 25,0 12,0 to 16,0 2,0 to 3,0 — 0,75 0,50 — —
M21, Z
C1, M12,
309LMo 0,04 0,5 to 2,5 1,0 0,04 0,03 21,0 to 25,0 12,0 to 16,0 2,0 to 3,0 — 0,75 0,50 — —
M21, Z
C1, M12,
309LNb 0,04 0,5 to 2,5 1,0 0,04 0,03 22,0 to 25,0 12,0 to 14,0 0,75 0,70 to 1,00 0,75 0,50 — —
M21, Z
C1, M12,
309LNiMo 0,04 0,5 to 2,5 1,0 0,04 0,03 20,5 to 23,5 15,0 to 17,0 2,5 to 3,5 — 0,75 0,50 — —
M21, Z
C1, M12,
310 0,20 1,0 to 2,5 1,0 0,03 0,03 25,0 to 28,0 20,0 to 22,5 0,75 — 0,75 0,50 — —
M21, Z
a
Single values are maximum values.
b
“No requirement for analysis” is indicated by a dash.
c
For certain specialized applications, including but not limited to medical and nuclear power applications, a significantly lower Co limit than 0,50 % may be necessary. A lower limit should be specified in the purchase order in
accordance with ISO 14344.
d
For alloys intended for high temperature, Bi should be restricted to 20 ppm maximum.
e
Consumables for which the chemical composition is not listed shall be symbolized by the letter G. The chemical composition ranges are not specified, and it is possible that two products with the same G classification are not
interchangeable.
ISO 17633:2025(en)
Table 3 (continued)
a,b
Chemical composition, % (by mass)
Alloy
designation
Typical shield-
according
ing
c d
C Mn Si P S Cr Ni Mo Nb + Ta Cu Co N Others
to alloy
gas
type
(see 5.5)
C1, M12,
312 0,15 0,5 to 2,5 1,0 0,04 0,03 28,0 to 32,0 8,0 to 10,5 0,75 — 0,75 0,50 — —
M21, Z
C1, M12,
316 0,08 0,5 to 2,5 1,0 0,04 0,03 17,0 to 20,0 11,0 to 14,0 2,0 to 3,0 — 0,75 0,50 — —
M21, Z
C1, M12,
316L 0,04 0,5 to 2,5 1,0 0,04 0,03 17,0 to 20,0 11,0 to 14,0 2,0 to 3,0 — 0,75 0,50 — —
M21, Z
C1, M12,
316H 0,04 to 0,08 0,5 to 2,5 1,0 0,04 0,03 17,0 to 20,0 11,0 to 14,0 2,0 to 3,0 — 0,75 0,50 — —
M21, Z
C1, M12,
316LCu 0,04 0,5 to 2,5 1,0 0,04 0,03 17,0 to 20,0 11,0 to 16,0 1,25 to 2,75 — 1,0 to 2,5 0,50 — —
M21, Z
C1, M12,
317 0,08 0,5 to 2,5 1,0 0,04 0,03 18,0 to 21,0 12,0 to 14,0 3,0 to 4,0 — 0,75 0,50 — —
M21, Z
C1, M12,
317L 0,04 0,5 to 2,5 1,0 0,04 0,03 18,0 to 21,0 12,0 to 14,0 3,0 to 4,0 — 0,75 0,50 — —
M21, Z
C1, M12,
318 0,08 0,5 to 2,5 1,0 0,04 0,03 17,0 to 20,0 11,0 to 14,0 2,0 to 3,0 8 × C to 1,0 0,75 0,50 — —
M21, Z
C1, M12,
347 0,08 0,5 to 2,5 1,0 0,04 0,03 18,0 to 21,0 9,0 to 11,0 0,75 8 × C to 1,0 0,75 0,50 — —
M21, Z
C1, M12,
347L 0,04 0,5 to 2,5 1,0 0,04 0,03 18,0 to 21,0 9,0 to 11,0 0,75 8 × C to 1,0 0,75 0,50 — —
M21, Z
C1, M12,
347H 0,04 to 0,08 0,5 to 2,5 1,0 0,04 0,03 18,0 to 21,0 9,0 to 11,0 0,75 8 × C to 1,0 0,75 0,50 — —
M21, Z
C1, M12, Ti: 10 × C to
409 0,10 0,80 1,0 0,04 0,03 10,5 to 13,5 0,60 0,75 — 0,75 0,50 —
M21, Z 1,5
C1, M12,
409Nb 0,10 1,2 1,0 0,04 0,03 10,5 to 13,5 0,6 0,5 8 × C to 1,5 0,5 0,50 — —
M21, Z
C1, M12,
410 0,12 1,2 1,0 0,04 0,03 11,0 to 13,5 0,60 0,75 — 0,75 0,50 — —
M21, Z
C1, M12,
410NiMo 0,06 1,0 1,0 0,04 0,03 11,0 to 12,5 4,0 to 5,0 0,40 to 0,70 — 0,75 0,50 — —
M21, Z
a
Single values are maximum values.
b
“No requirement for analysis” is indicated by a dash.
c
For certain specialized applications, including but not limited to medical and nuclear power applications, a significantly lower Co limit than 0,50 % may be necessary. A lower limit should be specified in the purchase order in
accordance with ISO 14344.
d
For alloys intended for high temperature, Bi should be restricted to 20 ppm maximum.
e
Consumables for which the chemical composition is not listed shall be symbolized by the letter G. The chemical composition ranges are not specified, and it is possible that two products with the same G classification are not
interchangeable.
ISO 17633:2025(en)
Table 3 (continued)
a,b
Chemical composition, % (by mass)
Alloy
designation
Typical shield-
according
ing
c d
C Mn Si P S Cr Ni Mo Nb + Ta Cu Co N Others
to alloy
gas
type
(see 5.5)
C1, M12,
430 0,10 1,2 1,0 0,04 0,03 15,0 to 18,0 0,60 0,75 — 0,75 0,50 — —
M21, Z
C1, M12,
430Nb 0,10 1,2 1,0 0,04 0,03 15,0 to 18,0 0,6 0,5 0,5 to 1,5 0,5 0,50 — —
M21, Z
C1, M12,
16–8-2 0,10 0,5 to 2,5 0,75 0,04 0,03 14,5 to 17,5 7,5 to 9,5 1,0 to 2,0 — 0,75 0,50 — Cr + Mo: 18,5
M21, Z
C1, M12, 0,08
2209 0,04 0,5 to 2,0 1,0 0,04 0,03 21,0 to 24,0 7,5 to 10,0 2,5 to 4,0 — 0,75 0,50 —
M21, Z to 0,20
C1, M12, 0,10 to
2307 0,04 2,0 1,0 0,03 0,02 22,5 to 25,5 6,5 to 10,0 0,8 — 0,50 0,50
M21, Z 0,20
C1, M12, 0,10
2553 0,04 0,5 to 1,5 0,75 0,04 0,03 24,0 to 27,0 8,5 to 10,5 2,9 to 3,9 — 1,5 to 2,5 0,50 —
M21, Z to 0,25
C1, M12, 0,20
2594 0,04 0,5 to 2,5 1,0 0,04 0,03 24,0 to 27,0 8,0 to 10,5 2,5 to 4,5 — 1,5 0,50 W: 1,0
M21, Z to 0,30
C1, M12, 0,08 to
2594W 0,04 0,5 to 2,0 1,0 0,04 0,03 23,0 to 27,0 8,0 to 11,0 2,5 to 4,0 — 1,0 0,50 W: 1,0 to 2,5
M21, Z 0,30
C1, M12,
e
G Any other agreed composition
M21, Z
a
Single values are maximum values.
b
“No requirement for analysis” is indicated by a dash.
c
For certain specialized applications, including but not limited to medical and nuclear power applications, a significantly lower Co limit than 0,50 % may be necessary. A lower limit should be specified in the purchase order in
accordance with ISO 14344.
d
For alloys intended for high temperature, Bi should be restricted to 20 ppm maximum.
e
Consumables for which the chemical composition is not listed shall be symbolized by the letter G. The chemical composition ranges are not specified, and it is possible that two products with the same G classification are not
interchangeable.
ISO 17633:2025(en)
Table 4 — Symbols and all-weld metal chemical composition requirements of non-gas shielded flux cored electrodes – Classification
according to alloy type – System B
a,b
Chemical composition, % (by mass)
Alloy
designation
Typical
according
shielding
c d
C Mn Si P S Cr Ni Mo Nb + Ta Cu Co N Others
to alloy
gas
type
(see 5.5)
307 NO 0,13 3,30 to 4,75 1,0 0,04 0,03 19,5 to 22,0 9,0 to 10,5 0,5 to 1,5 — 0,75 0,50 — —
308 NO 0,08 0,5 to 2,5 1,0 0,04 0,03 19,5 to 22,0 9,0 to 11,0 0,75 — 0,75 0,50 — —
308L NO 0,04 0,5 to 2,5 1,0 0,04 0,03 19,5 to 22,0 9,0 to 12,0 0,75 — 0,75 0,50 — —
0,04 to
308H NO 0,5 to 2,5 1,0 0,04 0,03 19,5 to 22,0 9,0 to 11,0 0,75 — 0,75 0,50 — —
0,08
308Mo NO 0,08 0,5 to 2,5 1,0 0,04 0,03 18,0 to 21,0 9,0 to 11,0 2,0 to 3,0 — 0,75 0,50 — —
308LMo NO 0,04 0,5 to 2,5 1,0 0,04 0,03 18,0 to 21,0 9,0 to 12,0 2,0 to 3,0 — 0,75 0,50 — —
0,07 to 0,25 to
308HMo NO 1,25 to 2,25 0,04 0,03 19,0 to 21,5 9,0 to 10,7 1,8 to 2,4 — 0,75 0,50 — —
0,12 0,80
309 NO 0,10 0,5 to 2,5 1,0 0,04 0,03 23,0 to 25,5 12,0 to 14,0 0,75 — 0,75 0,50 — —
309L NO 0,04 0,5 to 2,5 1,0 0,04 0,03 23,0 to 25,5 12,0 to 14,0 0,75 — 0,75 0,50 — —
309Mo NO 0,12 0,5 to 2,5 1,0 0,04 0,03 21,0 to 25,0 12,0 to 16,0 2,0 to 3,0 — 0,75 0,50 — —
309LMo NO 0,04 0,5 to 2,5 1,0 0,04 0,03 21,0 to 25,0 12,0 to 16,0 2,0 to 3,0 — 0,75 0,50 — —
309LNb NO 0,04 0,5 to 2,5 1,0 0,04 0,03 23,0 to 25,5 12,0 to 14,0 0,75 0,70 to 1,00 0,75 0,50 — —
310 NO 0,20 1,0 to 2,5 1,0 0,03 0,03 25,0 to 28,0 20,0 to 22,5 0,75 — 0,75 0,50 — —
312 NO 0,15 0,5 to 2,5 1,0 0,04 0,03 28,0 to 32,0 8,0 to 10,5 0,75 — 0,75 0,50 — —
316 NO 0,08 0,5 to 2,5 1,0 0,04 0,03 18,0 to 20,5 11,0 to 14,0 2,0 to 3,0 — 0,75 0,50 — —
316L NO 0,04 0,5 to 2,5 1,0 0,04 0,03 18,0 to 20,5 11,0 to 14,0 2,0 to 3,0 — 0,75 0,50 — —
316LK NO 0,04 0,5 to 2,5 1,0 0,04 0,3 17,0 to 20,0 11,0 to 14,0 2,0 to 3,0 — 0,75 0,50 — —
0,04 to
316H NO 0,5 to 2,5 1,0 0,04 0,03 18,0 to 20,5 11,0 to 14,0 2,0 to 3,0 — 0,75 0,50 — —
0,08
316LCu NO 0,03 0,5 to 2,5 1,0 0,04 0,03 18,0 to 20,5 11,0 to 16,0 1,25 to 2,75 — 1,0 to 2,5 0,50 — —
317 NO 0,08 0,5 to 2,5 1,0 0,04 0,03 18,5 to 21,0 13,0 to 15,0 3,0 to 4,0 — 0,75 0,50 — —
317L NO 0,04 0,5 to 2,5 1,0 0,04 0,03 18,5 to 21,0 13,0 to 15,0 3,0 to 4,0 — 0,75 0,50 — —
318 NO 0,08 0,5 to 2,5 1,0 0,04 0,03 18,0 to 20,5 11,0 to 14,0 2,0 to 3,0 8 × C to 1,0 0,75 0,50 — —
a
Single values are maximum values.
b
“No requirement for analysis” is indicated by a dash.
c
For certain specialized applications, including but not limited to medical and nuclear power applications, a significantly lower Co limit than 0,50 % may be necessary. A lower limit should be specified in the purchase order in
accordance with ISO 14344.
d
For alloys intended for high temperature, Bi should be restricted to 20 ppm maximum.
e
Consumables for which the chemical composition is not listed shall be symbolized by the letter G. The chemical composition ranges are not specified, and it is possible that two products with the same G classification are not
interchangeable.
ISO 17633:2025(en)
Table 4 (continued)
a,b
Chemical composition, % (by mass)
Alloy
designation
Typical
according
shielding
c d
C Mn Si P S Cr Ni Mo Nb + Ta Cu Co N Others
to alloy
gas
type
(see 5.5)
347 NO 0,08 0,5 to 2,5 1,0 0,04 0,03 19,0 to 21,5 9,0 to 11,0 0,75 8 × C to 1,0 0,75 0,50 — —
347L NO 0,04 0,5 to 2,5 1,0 0,04 0,03 19,0 to 21,5 9,0 to 11,0 0,75 8 × C to 1,0 0,75 0,50 — —
Ti: 10 × C
409 NO 0,10 0,80 1,0 0,04 0,03 10,5 to 13,5 0,60 0,75 — 0,75 0,50 —
to 1,5
409Nb NO 0,12 1,0 1,0 0,04 0,03 10,5 to 14,0 0,6 0,75 8 × C to 1,5 0,75 0,50 — —
410 NO 0,12 1,0 1,0 0,04 0,03 11,0 to 13,5 0,60 0,75 — 0,75 0,50 — —
410NiMo NO 0,06 1,0 1,0 0,04 0,03 11,0 to 12,5 4,0 to 5,0 0,40 to 0,70 — 0,75 0,50 — —
430 NO 0,10 1,0 1,0 0,04 0,03 15,0 to 18,0 0,60 0,75 — 0,75 0,50 — —
430Nb NO 0,10 1,0 1,0 0,04 0,03 15,0 to 18,0 0,6 0,75 0,5 to 1,5 0,75 0,50 — —
Cr + Mo:
16–8-2 NO 0,10 0,5 to 2,5 0,75 0,04 0,03 14,5 to 17,5 7,5 to 9,5 1,0 to 2,0 — 0,75 0,50 —
18,5
2209 NO 0,04 0,5 to 2,0 1,0 0,04 0,03 21,0 to 24,0 7,5 to 10,0 2,5 to 4,0 — 0,75 0,50 0,08 to 0,20 —
2307 NO 0,04 2,0 1,0 0,03 0,02 22,5 to 25,5 6,5 to 10,0 0,8 — 0,50 0,50 0,10 to 0,20 —
2553 NO 0,04 0,5 to 1,5 0,75 0,04 0,03 24,0 to 27,0 8,5 to 10,5 2,9 to 3,9 — 1,5 to 2,5 0,50 0,10 to 0,25 —
2594 NO 0,04 0,5 to 2,5 1,0 0,04 0,03 24,0 to 27,0 8,0 to 10,5 2,5 to 4,5 — 1,5 0,50 0,20 to 0,30 W: 1,0
e
G NO Any other agreed composition
a
Single values are maximum values.
b
“No requirement for analysis” is indicated by a dash.
c
For certain specialized applications, including but not limited to medical and nuclear power applications, a significantly lower Co limit than 0,50 % may be necessary. A lower limit should be specified in the purchase order in
accorda
...
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