ISO 21952:2025 溶接消耗品 — 耐クリープ鋼のガスシールドアーク溶接用ワイヤ電極、ワイヤ、ロッドおよびデポジット — 分類 | ページ 2

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 ).

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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 third edition cancels and replaces the second edition (ISO 21952:2012), 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;
• normative references have been updated;
• 5.4.2 additional text was added at the end of the subclause;
• Table 3, new compositions 9C1MV3 and 9C1MV4 were added and footnote b was revised;
• Table 3, the Mn + Ni for 9C1MV was revised;
• Table 3, footnotes f and g were revised;
• Table 4, X62X 9C1MV3 was added to reflect the addition in Table 3;
• Table 6 has been revised;
• Clause 10 was updated to match the rounding procedure used in other current standards;
• Clause 13 examples were revised, and new examples added.

Introduction

This document was prepared in collaboration with the International Institute of Welding. It recognizes that there are two somewhat different approaches in the global market to classifying a given wire electrode, wire, rod or deposit, 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 12070:1999 which has been withdrawn and replaced by this document. The classification in accordance with system B is mainly based upon standards used around the Pacific Rim.

This document proposes a classification system for wire electrodes, wires and rods in terms of their chemical composition and ここで, required, in terms of the yield strength, tensile strength and elongation of the all-weld metal deposit. The ratio of yield to tensile strength of weld metal is generally higher than that of parent metal. 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. Where the application requires matching tensile strength, selection of the consumable should be made by reference to column 4 of Table 4.

It should be noted that the mechanical properties of all-weld metal test pieces used to classify the electrodes, wires and rods vary from those obtained in production joints because of differences in welding procedure such as electrode size, width of weave, welding position and material composition.

1 Scope

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.

2 Normative references

The following referenced documents are indispensable for the application 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.

3 Terms and definitions

No terms and definitions are listed in this document.

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

Bibliography