How can a Rockwell hardness tester be used to test stainless steel?

Taiwan Nakazawa Co., Ltd. answers for you: Rockwell hardness testers can be used to inspect stainless steel materials, which are usually supplied in states such as annealed, quenched, tempered, or solution-treated. Standards specify the corresponding upper and lower hardness limit values, and hardness testing typically employs the HRC or HRB scales. For austenitic and ferritic stainless steels, the HRB scale is used; for martensitic and precipitation-hardening stainless steels, the HRC scale is used. For stainless steel thin-walled tubes and sheet materials with a thickness of 1~2mm or less, the N scale or T scale should be adopted.