National foreword

This Published Document is the UK implementation of CEN ISO/TR 20172:2021. It is identical to ISO/TR 20172:2021. It supersedes PD CEN ISO/TR 20172:2009, which is withdrawn.

The UK participation in its preparation was entrusted to Technical Committee WEE/36, Qualification of welding personnel and welding procedures.

A list of organizations represented on this committee can be obtained on request to its committee manager.

Contractual and legal considerations

This publication has been prepared in good faith, however no representation, warranty, assurance or undertaking (express or implied) is or will be made, and no responsibility or liability is or will be accepted by BSI in relation to the adequacy, accuracy, completeness or reasonableness of this publication. All and any such responsibility and liability is expressly disclaimed to the full extent permitted by the law.

This publication is provided as is, and is to be used at the recipient’s own risk.

The recipient is advised to consider seeking professional guidance with respect to its use of this publication.

This publication is not intended to constitute a contract. Users are responsible for its correct application.

This publication is not to be regarded as a British Standard.

Compliance with a Published Document cannot confer immunity from legal obligations.

This Published Document was published under the authority of the Standards Policy and Strategy Committee on 31 May 2021.

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 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 10, Quality management in the field of welding, 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 20172:2009), which has been technically revised.

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

Tables 1 to 5 have been revised;
new Table 6 has been added for nickel and nickel alloys.

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.

Introduction

This document reflects the situation at the time of publication.

Lists of former designations can be found in the relevant European materials standards.

For the materials not listed in this document, ISO/TR 20173:2018 and ISO/TR 20174:2020 are applicable.

This Technical Report was approved by CEN on 20 March 2021. It has been drawn up by the Technical Committee CEN/TC 121.

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, Turkey and United Kingdom.

European foreword

This document (CEN ISO/TR 20172:2021) 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 DIN.

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 CEN ISO/TR 20172:2009.

Endorsement notice

The text of ISO/TR 20172:2021 has been approved by CEN as CEN ISO/TR 20172:2021 without any modification.

1 Scope

This document establishes a European grouping system for materials for welding purposes, classified in accordance with the grouping system of ISO/TR 15608.

It is also applicable for other purposes such as heat treatment, forming and non-destructive testing.

This document covers grouping systems for the following standardized materials:

steel;
aluminium and its alloys;
copper and its alloys;
cast irons;
nickel and nickel alloys.

For materials that are not assigned to a group in this document, the criteria of ISO/TR 15608 apply.

2 Normative references

3 Terms and definitions

4 International grouping system for European materials

4.1 Types of steel in accordance with the grouping system of ISO/TR 15608:2017, Table 1

4.2 Types of aluminium and aluminium alloy in accordance with the grouping system of ISO/TR 15608:2017, Table 2

4.3 Types of copper and copper alloy in accordance with the grouping system of

ISO/TR 15608:2017, Table 3

4.4 Types of cast iron in accordance with the grouping system of

ISO/TR 15608:2017, Table 7

4.5 Types of nickel and nickel alloy in accordance with the grouping system of

ISO/TR 15608:2017, Table 4

Bibliography

PD CEN ISO/TR 20172:2021

Welding - Grouping systems for materials - European materials (ISO/TR 20172:2021)

Current

Published:

31 May 2021