GB/T 5028-2025: Metallic materials - Sheet and strip - Determination of tensile strain hardening exponent (n)

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Scope

This document specifies the principle, test apparatus, test samples, test procedures and
test report for determining the tensile strain hardening exponent (n value) of metal sheet
and strip.
This method is only applicable to the part of the stress-strain curve that shows a
monotonically continuous increase within the plastic deformation range (see 8.4).
If the stress-strain curve of the material during the work hardening stage is saw-toothed
(such as the Portevin-Le Chatelier saw-tooth yield effect exhibited by some AlMg
alloys), in order to make the given results have a certain degree of repeatability, an
automatic measurement method is used (linear regression of the logarithm of the true
stress-true plastic strain, see 8.7).

Basic Data

Standard ID	GB/T 5028-2025 (GB/T5028-2025)
Description (Translated English)	Metallic materials - Sheet and strip - Determination of tensile strain hardening exponent (n)
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H23
Classification of International Standard	77.040.10
Word Count Estimation	13,163
Date of Issue	2025-06-30
Date of Implementation	2026-01-01
Older Standard (superseded by this standard)	GB/T 5028-2008
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration