Stainless steel is no stranger to everyone. It can be seen everywhere in life. Stainless steel thermos cups, stainless steel bowls, etc. In fact, stainless steel pipe fittings are widely used in food and medical, metal products, machinery and equipment industries. According to different specific uses, people have different requirements for the hardness of stainless steel pipe fittings, so what parameters are used to express the hardness of stainless steel pipe fittings? In fact, there are mainly Brinell, Rockwell and Vickers indicators commonly used to measure the hardness of stainless steel pipe fittings. Different methods have the following differences:

1. Vickers hardness (HV)

The Vickers hardness test of stainless steel pipe fittings is an indentation test method that can be used to measure the hardness of very thin metal materials and surface layers. It has the main advantages of the Brinell and Rockwell test methods, but it is not as simple as the Rockwell method, and the Vickers method is rarely used in stainless steel pipe fitting standards. However, the Vickers hardness tester has a wide measurement range and can measure almost all metallic materials currently used in industry.

2. Brinell hardness (HB)

Among the stainless steel pipe fitting standards, the 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 harder or thinner steel and steel pipes.

3. Rockwell hardness (HR)

Rockwell hardness is the same as the Brinell hardness test using the indentation test method. But it measures the depth of the indentation. Rockwell hardness testing is the most widely used method today, but there are three Rockwell hardness scales: A, B, and C, usually denoted as HRA, HRB, and HRC. The representation is hardness data hardness notation. Among them, HRC is second only to Brinell hardness HB in steel pipe standards. Rockwell hardness can be used to measure metal materials from very soft to very hard, and the hardness value can be read directly from the dial of the hardness tester. However, hardness values are not as precise as the Brinell method. When the test sample is too small or the Brinell hardness (HB) is greater than 450, the Rockwell hardness measurement is used.