GB/T 231.2-2022: Metallic materials - Brinell hardness test - Part 2: Verification and calibration of testing machines

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Scope

This document specifies methods of direct and indirect verification of testing machines
used for determining Brinell hardness in accordance with GB/T 231.1 and also specifies
when these two types of verification have to be performed.
The direct verification involves checking that individual machine performance
parameters fall within specified limits whereas the indirect verification utilizes hardness
measurements of reference blocks, calibrated in accordance with GB/T 231.3, to check
the machine’s overall performance.
If a testing machine is also to be used for other methods of hardness testing, it has to be
verified independently for each method.
This document is applicable to both fixed location and portable hardness testing
machines. For machines that are incapable of satisfying the specified force-time profile,
the direct verification of force and testing cycle can be modified by the use of Annex B.

Basic Data

Standard ID	GB/T 231.2-2022 (GB/T231.2-2022)
Description (Translated English)	Metallic materials - Brinell hardness test - Part 2: Verification and calibration of testing machines
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	N71
Word Count Estimation	20,242
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration