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Material of stainless steel pipe fittings |
Publisher: Jiangsu Yushan Metal Technology Co., Ltd | Hits: 838 | Published on: 2024-1-29 13:36:36 | Close |
| Material analysis of stainless steel pipe fittings hardness Stainless steel pipes are generally measured by three hardness indicators: Brinell, Rockwell, and Vickers. Brinell hardness In the standard for stainless steel pipes, Brinell hardness is the most widely used and is often represented by the diameter of the indentation, which is both intuitive and convenient. However, it is not suitable for steel pipes made of harder or thinner steel. Rockwell hardness The Rockwell hardness test for stainless steel pipes, like the Brinell hardness test, is an indentation test method. The difference is that it measures the depth of the indentation. The Rockwell hardness test is currently a widely used method, with HRC being second only to the Brinell hardness HB in steel pipe standards. Rockwell hardness is suitable for measuring metal materials from extremely soft to extremely hard. It compensates for the shortcomings of the Brinell method and is simpler than the Brinell method. It can directly read the hardness value from the dial of the hardness machine. However, due to its small indentation, the hardness value is not as accurate as the Brinell method. Vickers hardness The Vickers hardness test for stainless steel pipes is also an indentation test method that can be used to determine the hardness of very thin metal materials and surface layers. It has the main advantages of the Brinell and Rockwell methods and overcomes their basic disadvantages, but it is not as simple as the Rockwell method, and the Vickers method is rarely used in steel pipe standards. Hardness testing 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. |
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