Stainless steel pipe is commonly used to measure the hardness of Brinell, Rockwell, Vickers hardness indicators.
In the stainless steel pipe standard, Brinell hardness is the most widely used, and the indentation diameter is often used to express the hardness of the material, which is intuitive and convenient. However, it is not suitable for steel pipes with harder or thinner steel materials.
The Rockwell hardness test of a stainless steel tube is the same as the Brinell hardness test. It is an indentation test method. The difference is that it measures the depth of the indentation. The Rockwell hardness test is a widely used method at present, in which HRC is used only in the steel pipe standard after the Brinell hardness HB. Rockwell hardness can be applied to the determination of very soft to extremely hard metal materials, it makes up for the Brookfield method is not, simpler than the Brookfield method, can read the hardness value directly from the dial of the hardness machine. However, due to its small indentation, the hardness value is not as accurate as the Brookfield method.
The stainless steel Vickers hardness test is also an indentation test method that can be used to determine very thin metallic materials and surface layer hardness. It has the main advantages of the Brinell and Rockwell methods, and overcomes their basic disadvantages, but it is not as easy as the Rockwell method. The Vickers method is rarely used in steel pipe standards.