At present, the hardness of stainless steel seamless pipe is generally measured by Brinell, Rockwell, Vickers three kinds of hardness indicators, so what is the specific situation?

1. For annealed stainless steel pipes with inner diameter above 6.0mm and wall thickness below 13mm, W-B75 Wechsler hardness tester can be used. It is very fast and simple to test, and is suitable for rapid and nondestructive qualification inspection of stainless steel pipes.

2. Stainless steel tubes with inner diameter greater than 30mm and wall thickness greater than 1.2mm are tested with Rockwell hardness tester for HRB and HRC hardness. For stainless steel tubes with inner diameter greater than 30mm and wall thickness less than 1.2mm, use surface Rockwell hardness tester to test HRT or HRN hardness.

3. Stainless steel pipes with inner diameter less than 0mm and greater than 4.8mm shall be tested with Rockwell hardness tester for HR15T. When the inner diameter is greater than 26mm, Rockwell or surface Rockwell hardness tester can also be used to test the hardness of the inner wall of the pipe.