GB/T 4340.2-2025: Metallic materials - Vickers hardness test - Part 2: Verification and calibration of testing machines

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Scope

This document specifies the verification and calibration methods for Vickers hardness tester
and diagonal measurement system used to determine Vickers hardness in accordance with GB/T
4340.1.
The direct verification method specified in this document applies to the verification and
calibration of the hardness tester, indenter and diagonal measurement system. The indirect
verification method applies to the verification of the entire Vickers hardness tester using a
standard block.
If the Vickers hardness tester is also used for hardness testing by other methods, then, the
Vickers hardness tester shall be respectively verified in accordance with the corresponding
methods.
This document also applies to the verification and calibration of portable Vickers hardness
testers.
This document does not apply to hardness testers that measure hardness using other different
principles (for example, ultrasonic impedance method).

Basic Data

Standard ID	GB/T 4340.2-2025 (GB/T4340.2-2025)
Description (Translated English)	Metallic materials - Vickers hardness test - Part 2: Verification and calibration of testing machines
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	N71
Classification of International Standard	19.060; 77.040.10
Word Count Estimation	22,226
Date of Issue	2025-03-28
Date of Implementation	2025-10-01
Older Standard (superseded by this standard)	GB/T 4340.2-2012
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration