This standard specifies the terms and definitions, test principles, sample cups, test devices, test procedures, accuracy of test results and test reports for steel plate secondary processing embrittlement test methods. This standard is applicable to the secondary processing embrittlement test of interstitial-free steel and phosphorus-strengthened steel sheets for stamping forming of auto parts with a thickness of 0.45 mm to 2.50 mm, and other steel sheets for stamping forming with secondary processing embrittlement characteristics.