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hardness
Stainless steel tube commonly used brinell, Rockwell, Vickers three hardness indicators to measure its hardness.
Brinell hardness
In the stainless steel tube standard, brinell hardness is the most widely used, often to indentation diameter to express the hardness of the material, both intuitive and convenient. However, it is not suitable for hard or thin steel pipes.
Rockwell hardness
The Rockwell hardness test of stainless steel tube is the same as brinell hardness test, which is the indentation test method. 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 second only to Brinell hardness HB in steel pipe standard. Rockwell hardness can be applied to determine from very soft to very hard metal materials, it makes up for the Brinell method is not, is simpler than brinell method, can be directly from the hardness machine dial read hardness value. However, due to the small indentation, the hardness value is not as accurate as buchwald method.
Vickers hardness
Stainless steel tube Vickers hardness test is also an indentation test method, can be used to determine the hardness of very thin metal materials and surface layer. It has the main advantages of Brinell and Rockwell methods and overcomes their basic disadvantages, but it is not as simple as Rockwell methods and is seldom used in steel pipe standards.
Hardness testing