GB/T 231.2-2022 specifies the inspection and calibrate specifications for hardness gauge in brinell hardness test of metal materials. The standard specifies inspection calibrate items, such as hardness gauge force value accuracy, indenter geometric size accuracy, indication Repeatability, etc. There are strict requirements for the accuracy of standard Hardness blocks and other equipment used for inspection calibrate, and the operation process is explained in detail, covering equipment Appearance inspection, different load testing and data processing methods. Through the implementation of the specification, ensure the reliable performance of Brinell hardness tester, provide guarantee for the accuracy of brinell hardness measurement of metal materials, and support the mass inspection work in the metal industry.