ISO TR 20172-2021 PDF

Full title and description

ISO/TR 20172:2021 — Welding — Grouping systems for materials — European materials. This technical report defines a European grouping system for materials used in welding and related processes, aligning classifications with the ISO grouping system described in ISO/TR 15608.

Abstract

The report establishes grouping systems for standardized European materials to support welding, and is also applicable to heat treatment, forming and non-destructive testing. It covers grouping schemes for steels; aluminium and its alloys; copper and its alloys; cast irons; and nickel and nickel alloys. For materials not assigned a group in this report, the criteria of ISO/TR 15608 apply.

General information

• Status: Published.
• Publication date: April 2021 (ISO official publication).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 25.160.20 (Welding).
• Edition / version: Edition 3 (2021).
• Number of pages: 33 (ISO English edition — note some national/adopted publications show different page counts due to formatting).

Scope

Provides a European material-grouping system for welding purposes, classified in accordance with ISO/TR 15608. The report applies to grouping of standard materials used in welding and, where relevant, to related activities such as heat treatment, forming and non-destructive testing. Material families explicitly covered include steels, aluminium and its alloys, copper and its alloys, cast irons and nickel and nickel alloys; materials not listed are to be assigned following ISO/TR 15608 criteria.

Key topics and requirements

• European grouping scheme for welding materials mapped to the ISO/TR 15608 classification principles.
• Defined material groups for: steels; aluminium and alloys; copper and alloys; cast irons; nickel and nickel alloys.
• Guidance for using grouping information for welding procedures, heat treatment, forming and non-destructive testing.
• Instructions for materials not directly listed — use ISO/TR 15608 criteria to determine appropriate grouping.
• Alignment and revision history that replaces earlier ISO/TR 20172 editions (2009 and earlier).

Typical use and users

Used by welding engineers, materials engineers, quality and inspection personnel, standards committees, technical authors of welding procedure specifications (WPS), and organizations performing heat treatment, forming or non‑destructive testing where grouped material information is required for procedure qualification, selection of consumables, or conformity assessment.

Related standards

Primary related documents include ISO/TR 15608 (guidelines/criteria for metallic materials grouping) and earlier editions of ISO/TR 20172 (2009, 2006) which this 2021 edition revises. The report is produced under ISO/TC 44/SC 10 (Welding and allied processes).

Keywords

welding; materials grouping; European materials; steels; aluminium; copper; cast iron; nickel alloys; ISO/TR 20172; ISO/TR 15608; welding procedure qualification; heat treatment; non-destructive testing.

FAQ

Q: What is this standard?

A: ISO/TR 20172:2021 is a technical report that establishes a European grouping system for materials relevant to welding and related processes.

Q: What does it cover?

A: It covers classification/grouping schemes for steels; aluminium and its alloys; copper and its alloys; cast irons; and nickel and nickel alloys, and gives guidance on applying those groupings for welding, heat treatment, forming and NDT. For materials not assigned in the report, ISO/TR 15608 criteria apply.

Q: Who typically uses it?

A: Welding and materials engineers, quality/inspection staff, standards committees, document authors of welding procedures and organizations involved in welding qualification, heat treatment, forming and non-destructive testing.

Q: Is it current or superseded?

A: Current — ISO/TR 20172:2021 is the published (Edition 3, April 2021) version and replaces earlier editions such as ISO/TR 20172:2009 and ISO/TR 20172:2006.

Q: Is it part of a series?

A: Yes — it is part of the ISO welding grouping guidance suite and is linked to ISO/TR 15608 (the ISO grouping/criteria document). It is maintained under ISO technical committees responsible for welding (ISO/TC 44/SC 10).

Q: What are the key keywords?

A: Welding, material grouping, European materials, steels, aluminium, copper, cast iron, nickel alloys, ISO/TR 15608, procedure qualification.