The hardness of seamless steel tube inspection tools

The inner diameter of the seamless steel tube above 6.0 mm, 13 mm thickness in the following annealing seamless steel pipe, can be used W - type B75 Webster hardness tester, test is very quick, easy, it is suitable for the seamless steel pipe to do fast nondestructive inspection qualified. Seamless steel pipe diameter greater than 30 mm, wall thickness of seamless steel tube is greater than 1.2 mm, using rockwell hardness tester, HRB, HRC hardness test. Seamless steel tube diameter greater than 30 mm, wall thickness less than 1.2 mm of seamless steel tube, using surface rockwell hardness tester, HRT or HRN hardness test. Is greater than 4.8 mm in diameter less than 0 mm, seamless steel pipe, pipe use special rockwell hardness tester, testing HR15T hardness. When seamless steel tube diameter greater than 26 mm, can also use the rockwell or surface rockwell hardness tester to test the hardness of tube wall.