GB/T 231.2-2022 "Metallic materials - Brinell hardness test - Part 2: Verification and calibration of testing machines" specifies the methods and intervals for direct and indirect verification of Brinell hardness testing machines. Direct verification involves testing hardware parameters such as test force, ball indenter, and measuring devices, with the test force required to be measured multiple times at different positions of the indenter. Indirect verification assesses the overall performance of the system through standardized hardness test blocks, requiring that the repeatability of the indicated values complies with the standard. Tolerances are set according to the F/D² ratio classification, and additional content related to the verification of non-conventional hardness testing machines has been introduced. This standard is applicable to the routine verification and calibration of Brinell hardness testing machines.