Foreword

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This document was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee SC 1, Uniaxial testing, in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 459/SC 1, Test methods for steel (other than chemical analysis), in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This third edition cancels and replaces the second edition (ISO 6892-2:2018), which has been technically revised.

The main changes are as follows:

revision of 9.3;
wording in 10.3;
wording in 10.4;
revision of Clause 12;
wording in Annex A;
update of references, especially to ISO 6892-1, specific clauses, figures and annexes;
editorial modifications.

A list of all parts in the ISO 6892 series can be found on the ISO website.

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

In this document, two methods of testing speeds are described. The first, Method A, is based on strain rates (including crosshead separation rate) with narrow tolerances (±20 %) and the second, Method B, is based on conventional strain rate ranges and tolerances (strain rates from former editions). Method A is intended to minimize the variation of the test rates during the moment when strain rate-sensitive parameters are determined and to minimize the measurement uncertainty of the test results.

The influence of the testing speed on the mechanical properties, determined by the tensile test, is normally greater at an elevated temperature than at room temperature.

Traditionally, mechanical properties determined by tensile tests at elevated temperatures have been determined at a slower strain or stressing rate than at room temperature. This document recommends the use of slow strain rates but, in addition, higher strain rates are permitted for particular applications, such as comparison with room temperature properties at the same strain rate.

1 Scope

This document specifies a method of tensile testing of metallic materials at temperatures higher than room temperature.

2 Normative references

3 Terms and definitions

4 Symbols

5 Principle

6 Test piece

7 Determination of original cross-sectional area (S_o)

8 Marking the original gauge length (L_o)

9 Apparatus

9.1

9.2

9.3

10 Test conditions

10.1 Setting the force zero point

10.2 Gripping of the test piece, fixing of the extensometer and heating of the test piece, not necessarily in the following sequence

10.3 Testing rate based on strain rate control (Method A)

10.4 Method of testing with expanded strain rate ranges (Method B)

10.5 Choice of the method and rates

10.6 Documentation of the chosen testing conditions

11 Determination or calculation of the properties

12 Test report

13 Measurement uncertainty

14 Figures

15 Annexes

Bibliography

ISO 6892-2:2026

Metallic materials. Tensile testing - Method of test at elevated temperature

Current

Published:

3 Aug 2026

1 Scope