Everyone is no stranger to stainless steel. It can be seen everywhere in life, such as stainless steel vacuum cups, stainless steel bowls and so on. In fact, stainless steel pipe fittings are widely used in food and medical, metal products, machinery and equipment industries. People have different requirements for the hardness of stainless steel threaded pipe fittings according to their specific uses. Today, the editor of Hao Jun will give you a popular science: How does the hardness of stainless steel threaded pipe fittings represent? In fact, there are mainly Brinell, Rockwell and Vickers indicators that are often used for measurement.
The hardness of stainless steel threaded pipe fittings has the following differences in different methods:
1. Vickers hardness (HV)
The Vickers hardness test of stainless steel threaded 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 metal materials currently used in the industry.
2. Brinell hardness (HB)
Among the stainless steel threaded pipe fitting standards, Brinell hardness is the most widely used. The indentation diameter is commonly used to indicate 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)
The Rockwell hardness test uses the indentation test method the same as the Brinell hardness test. But it measures the depth of the indentation. Rockwell hardness test is currently a widely used method, but there are three standards for Rockwell hardness grades: A, B and C, usually recorded as HRA, HRB and HRC. Representation method is hardness data hardness symbol. Among them, HRC is second only to Brinell hardness HB in the steel pipe standard. 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, the hardness value is not as accurate 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.
