GB/T 230.1-2009 specifies the rockwell hardness test method for metal materials. Part 1 covers 11 kinds of scales such as A, B, C, etc., detailing the scope of application, test principle and equipment requirements of each ruler. Clarify the preparation specification of the sample, and explain in detail the steps of applying, maintaining and removing the test force, as well as the measurement and calculation method of Hardness value. This standard helps the metal material industry to accurately use different rulers to carry out rockwell hardness testing, providing a reliable basis for evaluating material performance and controlling product mass, ensuring that the test results are accurate and comparable.