stainless steel pipeIt is a hollow, elongated circular steel material widely used in industrial transportation pipelines and mechanical structural components such as petroleum, chemical, food, light industry, and mechanical instruments. In addition, when the bending and torsional strength are the same, the weight is relatively light, so it is also widely used in the manufacturing of mechanical parts and engineering structures. It is also commonly used as furniture and kitchenware.

In the standard for stainless steel pipes, Brinell hardness is widely used and is often represented by the indentation diameter to indicate the hardness of the material, which is both intuitive and convenient. But it is not suitable for steel pipes made of harder or thinner steel.

The Rockwell hardness test for stainless steel pipes, like the Brinell hardness test, is an indentation test method. Differently, it measures the depth of the indentation. The Rockwell hardness test is currently a widely used method, with HRC being second only to Brinell hardness HB in steel pipe standards. Rockwell hardness can be used to determine metal materials ranging from extremely soft to extremely hard, and it compensates for the shortcomings of the Brinell method. It is simpler than the Brinell method and 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.