ISO 26304:2025
(Main)Welding consumables — Solid wire electrodes, tubular cored electrodes and electrode-flux combinations for submerged arc welding of high strength steels — Classification
Welding consumables — Solid wire electrodes, tubular cored electrodes and electrode-flux combinations for submerged arc welding of high strength steels — Classification
This document specifies requirements for classification of solid wire electrodes, tubular cored electrodes, and electrode-flux combinations (the all-weld metal deposits) in the as-welded condition and in the post-weld heat-treated condition for submerged arc welding of high strength steels with a minimum yield strength greater than 500 MPa or a minimum tensile strength greater than 570 MPa. One flux can be tested and classified with different electrodes. One electrode can be tested and classified with different fluxes. The solid wire electrode is also classified separately based on its chemical composition. This document is a combined specification providing for classification utilizing a system based on the yield strength and average impact energy of 47 J for the all-weld metal, or utilizing a system based on the tensile strength and average impact energy of 27 J for the all-weld metal. a) Clauses, subclauses and tables which carry the suffix “system A” are applicable only to solid wire electrodes, tubular cored electrodes and the all-weld metal deposits classified to the system based on the yield strength and the average impact energy of 47 J for the all-weld metal obtained with electrode-flux combinations in accordance with this document. b) Clauses, subclauses and tables which carry the suffix “system B” are applicable only to solid wire electrodes, tubular cored electrodes and the all-weld metal deposits classified to the system based on the tensile strength and the average impact energy of 27 J for the all-weld metal obtained with electrode-flux combinations in accordance with this document. c) Clauses, subclauses and tables which do not have either the suffix “system A” or “system B” are applicable to all solid wire electrodes, tubular cored electrodes and electrode-flux combinations classified in accordance with this document. For comparison purposes, some tables include requirements for electrodes classified in accordance with both systems, placing individual electrodes from the two systems, which are similar in composition and properties, on adjacent lines in the particular table. In a particular line of the table that is mandatory in one system, the symbol for the similar electrode from the other system is indicated in parentheses. By appropriate restriction of the formulation of a particular electrode, it is often, but not always, possible to produce an electrode that can be classified in both systems, in which case the electrode, or its packaging, can be marked with the classification in either or both systems. For system B only, electrode flux combinations for the single-run and two-run techniques are classified on the basis of the two-run technique.
Produits consommables pour le soudage — Fils-électrodes pleins, fils-électrodes fourrés et couples électrodes-flux pour le soudage à l'arc sous flux des aciers à haute résistance — Classification
ISO 26304:2017 spécifie les exigences relatives à la classification des fils-électrodes pleins, des fils-électrodes fourrés et des couples fils-flux (dépôts en métal fondu hors dilution) à l'état brut de soudage ou après traitement thermique après soudage des aciers à haute résistance ayant une limite d'élasticité minimale supérieure à 500 MPa ou une résistance à la traction minimale supérieure à 570 MPa. Un flux peut être soumis à essai et être classifié avec différents fils-électrodes. Un fil-électrode peut être soumis à essai et être classifié avec différents flux. Le fil-électrode plein est également classifié séparément d'après sa composition chimique. La présente Norme internationale constitue une spécification mixte permettant une classification utilisant un système basé soit sur la limite d'élasticité et l'énergie de rupture moyenne de 47 J pour le métal fondu hors dilution, soit sur la résistance à la traction et l'énergie de rupture moyenne de 27 J pour le métal fondu hors dilution. a) Les articles, les paragraphes et les tableaux qui portent le suffixe «A» ne sont applicables qu'aux fils-électrodes pleins, aux fils-électrodes fourrés et dépôts en métal fondu hors dilution classifiés d'après le système basé sur la limite d'élasticité et l'énergie de rupture moyenne de 47 J pour le métal fondu hors dilution obtenu avec des couples fils-flux conformément à la présente Norme internationale. b) Les articles, les paragraphes et les tableaux qui portent le suffixe «B» ne sont applicables qu'aux fils-électrodes pleins, aux fils-électrodes fourrés et dépôts en métal fondu hors dilution classifiés d'après le système basé sur la résistance à la traction et l'énergie de rupture moyenne de 27 J pour le métal fondu hors dilution obtenu avec des couples fils-flux conformément à la présente Norme internationale. c) Les articles, les paragraphes et les tableaux qui ne portent ni le suffixe «A» ni le suffixe «B» sont applicables à tous les fils-électrodes pleins, fils-électrodes fourrés et couples fil-flux classifiés conformément à la présente Norme internationale. À des fins de comparaison, certains tableaux comportent des exigences pour des électrodes classifiées selon les deux systèmes, en plaçant des électrodes individuelles issues des deux systèmes, semblables en composition et en propriétés, sur des lignes adjacentes du tableau particulier. Sur une ligne particulière du tableau, obligatoire pour un système, le symbole pour l'électrode semblable dans l'autre système est indiqué entre parenthèses. Selon une restriction appropriée de la formulation d'une électrode particulière, il est souvent mais pas toujours possible de produire une électrode qui peut être classifiée selon les deux systèmes, auquel cas l'électrode, ou son emballage, peut être marquée avec la classification de l'un ou l'autre système.
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ISO 26304
Fourth edition
Welding consumables — Solid wire
2025-03
electrodes, tubular cored electrodes
and electrode-flux combinations
for submerged arc welding of high
strength steels — Classification
Produits consommables pour le soudage — Fils-électrodes pleins,
fils-électrodes fourrés et couples électrodes-flux pour le soudage à
l'arc sous flux des aciers à haute résistance — Classification
Reference number
© ISO 2025
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ii
Contents Page
Foreword .iv
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classification . 2
4.1 General .2
4.2 Classification systems .2
5 Symbols and requirements . 3
5.1 General .3
5.2 Symbol for the product or process .3
5.3 Symbols for the tensile properties of the all-weld metal deposit.4
5.3.1 Multi-run technique . .4
5.3.2 Two-run technique – system B only .5
5.4 Symbol for the impact properties of the multi-run or two-run technique .5
5.5 Symbol for the type of welding flux .6
5.6 Symbol for the chemical composition of solid wire electrodes and of the all-weld metal
from tubular cored electrode-flux combinations .6
5.7 Symbol for post-weld heat treatment . 12
5.8 Optional symbol for hydrogen content of deposited metal . 13
6 Mechanical tests . 14
6.1 Multi-run technique .14
6.1.2 Preheating and interpass temperature .14
6.1.3 Welding conditions and pass sequence . 15
6.2 Two-run technique – system B only .16
7 Chemical analysis . .16
8 Rounding procedure .16
9 Retests . 17
10 Technical delivery conditions . 17
11 Examples of designation . 17
11.1 General .17
11.2 Example 1 – Classification by yield strength and 47 J impact energy – system A .17
11.3 Example 2 – Classification by tensile strength and 27 J impact energy – system B .18
11.4 Example 3 – Classification by yield strength and 47 J impact energy – system A .18
11.5 Example 4 – Classification by tensile strength and 27 J impact energy – system B .18
11.6 Example 5 – Classification by yield strength and 47 J impact energy – system A .18
11.7 Example 6 – Classification by tensile strength and 27 J impact energy – system B .18
11.8 Example 7 – Classification by yield strength and 47 J impact energy – system A .19
11.9 Example 8 – Classification by tensile strength and 47 J impact energy – system B .19
Annex A (informative) Possible risk of weld metal hydrogen cracking .20
Bibliography .21
iii
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
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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)
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this may not represent the latest information, which may be obtained from the patent database available at
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Any trade name used in this document is information given for the convenience of users and does not
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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 26304:2017), which has been technically
revised.
The main changes are as follows:
— this document has been reformatted in single column showing System A and System B in tables and
separate clauses and subclauses, some which are new;
— a new paragraph has been added to the end of Clause 1, Scope;
— normative references updated;
— Table 1 was updated;
— Table 3 values for System B were revised to reflect those in ISO 18275 and ISO 18276
— Table 7 and Table 8 were revised and new footnotes added; header of the last column was revised;
— Table 11, H8 was added;
— Table 12, System B was revised;
— Subclause 5.3 was revised;
— Subclause 6.2 was revised;
— Clause 11, examples updated and expanded.
iv
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.
v
Introduction
This document recognizes that there are two somewhat different approaches in the global market to classifying
a given solid wire electrode, tubular cored electrode, and electrode-flux combination, 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 originally based on EN 14295 which has been withdrawn and replaced by
this document. The classification in accordance with system B is mainly based on standards used around the
Pacific Rim. Future revisions aim to merge the two approaches into a single classification system.
This document provides a classification for the designation of solid wire electrodes in terms of their
chemical composition, tubular cored electrodes in terms of the deposit composition obtained with a
particular submerged arc flux, and, where required, electrode-flux combinations in terms of the yield
strength, tensile strength, elongation, and impact properties of the all-weld metal deposit. The ratio of yield
to tensile strength of weld metal is generally higher than that of parent material. Users should note that
matching weld metal yield strength to parent metal yield strength does not necessarily ensure that the weld
metal tensile strength matches that of the parent material. Thus, where the application requires matching
tensile strength, selection of the consumable should be made by reference to columns 3 or 6 of Table 3, as
appropriate.
Although combinations of electrodes and fluxes supplied by individual companies can have the same system
A classification, it is possible that the combination of an electrode with a flux from one manufacturer and the
same electrode with a flux from another manufacturer, both fluxes having the same classification, may not
be interchangeable unless verified in accordance with this document. Two tubular cored wires of the same
classification can likewise produce different results with the same flux.
The mechanical properties of the all-weld metal test specimens used t
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