Hardness testing of stainless steel pipes

Annealed stainless steel pipes with an inner diameter of 6.0mm or more and a wall thickness of 13mm or less can be tested using the W-B75 Vickers hardness tester, which is very fast and simple, suitable for rapid non-destructive qualification inspection of stainless steel pipes. Stainless steel pipes with an inner diameter greater than 30mm and a wall thickness greater than 1.2mm shall be tested for HRB and HRC hardness using a Rockwell hardness tester. Stainless steel pipes with an inner diameter greater than 30mm and a wall thickness less than 1.2mm shall be tested for HRT or HRN hardness using a surface Rockwell hardness tester. Stainless steel pipes with an inner diameter less than 0mm and greater than 4.8mm are tested for HR15T hardness using a specialized Rockwell hardness tester for pipes. When the inner diameter of stainless steel pipes is greater than 26mm, Rockwell or surface Rockwell hardness testers can also be used to test the hardness of the inner wall of the pipe.