The hardness of stainless steel tube is usually measured by brinell, lowe's and vickers.
In the standard of stainless steel tube, brinell hardness is the most widely used.
However, it is not suitable for steel pipes of harder or thinner steel.
The rockwell hardness test of stainless steel tube is the same as the brinell hardness test.
The difference is that it measures the depth of the indentation.
Rockwell hardness test is a widely used method at present, among which HRC is only second to brinell hardness HB in steel pipe standard.
Rockwell hardness can be used to measure metal materials from extremely soft to extremely hard.
However, due to its small indentation, the hardness value is not as accurate as brinell method.
Vickers hardness test of stainless steel tube is also a indentation test method, which can be used to measure the hardness of very thin metal material and surface layer.
It has the main advantages of bushi and luo's method, and overcomes their basic disadvantages, but is not as simple as luo's method.
The annealed stainless steel pipe with inner diameter of 6.0mm and wall thickness of 13mm can be tested by w-b75 wechsler hardness tester, which is very fast and convenient, and is suitable for rapid and non-destructive inspection of stainless steel pipe.
The inner diameter of stainless steel pipe is greater than 30mm and the wall thickness is greater than 1.2mm.
Stainless steel tubes with an inner diameter of more than 30mm and a wall thickness of less than 1.2mm were used to test HRT or HRN hardness using a surface rockwell hardness tester.
Stainless steel tubes with an inner diameter of less than 0mm and larger than 4.8mm are used to test HR15T hardness using a special rockwell hardness tester.
When the inner diameter of the stainless steel pipe is greater than 26mm, the hardness of the inner wall of the pipe can be tested by using rockwell or surface rockwell hardness tester.