Method / Step
The first one: Rockwell hardness. The test of the cylinder tube on the Rockwell hardness is actually the same as the Brinell hardness test, which uses the indentation test method, but the difference is that Rockwell mainly measures the depth of the indentation, of which Rockwell The hardness test method is the most widely used, because Rockwell hardness is more suitable for testing soft metal materials, effectively making up for the lack of Brinell hardness test, and the method and method are relatively simple. But because the indentation is relatively small, the hardness value is not as accurate as the Brinell method.
The second kind: Brinell hardness. In the standard test of the entire cylinder tube, Brinell hardness is the most widely used, and its indentation is often used to indicate the main hardness of the material, which is not only intuitive but also very convenient. However, if it is hard or thin steel, the method is not suitable.
The third type: Vickers hardness. This kind of hardness test is still an indentation test method, which is more suitable for thinner metals or materials with higher hardness of the surface layer. It has the dual advantages of Rockwell and Brinell, but the shortcomings of the two hardness tests To overcome, but it is not as simple and convenient as Rockwell, so Vickers is less used in the case of high steel pipe standards.