GB/T 231.1-2018 Specifies the test method for brinell hardness of metal materials. It explains the test principle and is suitable for a variety of metal materials. The requirements for the indenter and the accuracy of the loading device of the Brinell hardness tester are put forward, and the preparation points of the sample are described in detail, including size and surface mass. The standard also strictly stipulates the test process, such as the time for applying the test force, holding and removing, and the method for calculating the Hardness value based on the indentation diameter measurement. According to this standard, the metal brinell hardness can be accurately determined, providing key support for the performance detection and mass control of metal materials, and is widely used in metal processing, Quality control and other industries.