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[304 stainless steel pipe] What determines the hardness of 304 stainless steel pipe?

by:HHGG     2021-04-29
[304 stainless steel pipe] What determines the hardness and softness? 2019-09-06    When some users buy 304 stainless steel pipe, they often judge the quality of 304 stainless steel pipe according to the hardness of the pipe. This approach can be said to be right or wrong. It is impossible to judge the quality of the 304 stainless steel tube solely by its hardness. Today I will give you an analysis: What is the hardness of stainless steel pipes, and what is the difference?    There are three main indicators for measuring the hardness of stainless steel pipes: Brinell, Rockwell, and Vickers. The differences are as follows: 1. Vickers hardness (code HV)    stainless steel pipe Vickers hardness test is an indentation test method, which can be used to determine the hardness of very thin metal materials and surface layers. It has the main advantages of Brinell and Rockwell test methods, but overcomes their basic shortcomings, but is not as simple as Rockwell method, and Vickers method is rarely used in steel pipe standards. However, the Vickers hardness tester has a wide measuring range and can measure almost all metal materials currently used in the industry.  2, Brinell hardness (code HB)    In the stainless steel pipe standard, Brinell hardness is widely used, and the hardness of the material is often expressed by the indentation diameter, which is intuitive and convenient. But it is not suitable for harder or thinner steel and steel pipes.  3, Rockwell hardness (code HR)    is the same as the Brinell hardness test, both are indentation test methods. But it measures the depth of the indentation. Rockwell hardness test is a widely used method at present, but the Rockwell hardness scale has three standards: A, B, and C, usually denoted as HRA, HRB, and HRC, and the representation method is hardness data + hardness symbol, such as 50HRC. 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 machine. But the hardness value is not as accurate as the Brinell method. When the tested sample is too small or the Brinell hardness (HB) is greater than 450, use Rockwell hardness measurement instead.   The two commonly used stainless steel decorative pipe materials are 201 stainless steel pipe and 304 stainless steel pipe. The main factor affecting the hardness of the two is the carbon content in the raw material. The carbon element in the stainless steel tube is mainly to increase its hardness, but it is not that the higher the hardness, the better. The higher the carbon content, the lower the plasticity of the stainless steel tube and the easier it is to rust. . In the 201 stainless steel pipe, another factor that affects its hardness is the content of copper in it. The 201 stainless steel pipe with high copper content has better toughness, enhanced plasticity, and softer pipe.   Therefore, it is inaccurate to judge the quality of stainless steel pipes solely based on the softness and hardness of 304 stainless steel pipes or 201 stainless steel pipes. The editor recommends that you still choose a stainless steel pipe manufacturer with guaranteed quality when purchasing.  
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