GB/T 230.2-2022 "Metallic materials — Rockwell hardness test — Part 2: Verification and calibration of testing machines and indenters" was released in July 2022 and implemented in February 2023, replacing the 2012 version and adopting modifications based on international standards. This standard specifies the methods for direct and indirect verification of Rockwell hardness testing machines, as well as the requirements for the verification and calibration of indenters. Direct verification covers key parameters such as test force and depth measurement, while indirect verification uses calibrated standard hardness blocks to assess equipment performance. Compared to the previous version, it explicitly designates tungsten carbide hard alloy balls as the standard indenter and introduces new content such as hysteresis testing for hardness testing machines. The standard applies to both stationary and portable hardness testers, providing a unified basis for performance control of hardness testing equipment for metallic materials, thereby ensuring the accuracy and reliability of test results.