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Knowledge of hardness of stainless steel pipes

Release Time:

2023-05-25

Hardness testing of annealed stainless steel pipes. Materials with an inner diameter greater than 6mm and a wall thickness less than 13mm can use the W-B75 Vickers hardness tester, which is very fast and simple, and is suitable for rapid non-destructive qualification testing of stainless steel pipe materials. Stainless steel pipes with an inner diameter greater than 30 millimeters and a wall thickness greater than 1 or 2 millimeters should be subjected to HRB and HRC hardness testing using a Rockwell hardness tester. For stainless steel pipes with an inner diameter greater than 30 millimeters and a wall thickness less than 1 or 2 millimeters, a surface Rockwell hardness tester should be used to test HRT or HRN hardness. For stainless steel pipes with an inner diameter less than 0 millimeters and greater than 4 or 8 millimeters, a pipeline specific Rockwell hardness tester should be used to test HR15T hardness. When the inner diameter of stainless steel pipes is greater than 26 millimeters, Rockwell or surface Rockwell hardness testers can also be used to test the hardness of the inner walls of the pipes.

Knowledge of hardness of stainless steel pipes

1. Hardness testing of annealed stainless steel pipes. Materials with an inner diameter greater than 6mm and a wall thickness less than 13mm can use the W-B75 Vickers hardness tester, which is very fast and simple, and is suitable for rapid non-destructive qualification testing of stainless steel pipe materials. Stainless steel pipes with an inner diameter greater than 30 millimeters and a wall thickness greater than 1 or 2 millimeters should be subjected to HRB and HRC hardness testing using a Rockwell hardness tester. For stainless steel pipes with an inner diameter greater than 30 millimeters and a wall thickness less than 1 or 2 millimeters, a surface Rockwell hardness tester should be used to test HRT or HRN hardness. For stainless steel pipes with an inner diameter less than 0 millimeters and greater than 4 or 8 millimeters, a pipeline specific Rockwell hardness tester should be used to test HR15T hardness. When the inner diameter of stainless steel pipes is greater than 26 millimeters, Rockwell or surface Rockwell hardness testers can also be used to test the hardness of the inner walls of the pipes.

2. The Vickers hardness test for stainless steel pipes is also an indentation test method that can be used to measure the hardness of very thin metal materials and surface layers. It has the main advantages of the Brinell method and the Rockwell method, but overcomes their basic disadvantages, but is not as simple as the Rockwell method, and the Vickers method is rarely used in steel pipe standards.

3. The Rockwell scale for stainless steel pipes with Rockwell hardness is an indentation test method, just like the Brinell hardness hardness test. The difference is that it is used to measure the depth of the indentation. Rockwell scale is a widely used method at present. HRC is second only to Brinell hardness hardness HB in steel pipe standards. Rockwell hardness can be used to measure metal materials from soft to very hard, making up for the shortcomings of the Brinell method and being simpler than the Brinell method. The hardness value can be directly read from the dial of the hardness machine. However, due to the small indentation, the hardness value is not as accurate as the Brinell method.

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