Three kinds of hardness of stainless steel pipe

Stainless steel pipe is a hollow long round steel, are widely used in various industries, hardness is that we need to know about it, the paper simply introduces its three hardness:

 

1, rockwell hardness,

 

Stainless steel GuanLuo hardness test, like brinell hardness test, indentation test method. The difference is that it is measuring the depth of the indentation, rockwell hardness test is the method of the current application is very wide, including HRC in steel pipe used in standard after brinell hardness HB, rockwell hardness can be applied to determine the extremely soft to hard metal materials, it is not made up for brinell method, the brinell method is simple, can be read directly from the dial of the hardness machine hardness value. However, because of its small creasing, so, as brinell hardness value accurately.

 

2, brinell hardness

 

In stainless steel tube standard, the most versatile brinell hardness, is often expressed in creasing diameter to the hardness of the material, intuitive, and convenient, but for a hard or thinner steel pipe is not applicable.

 

3, vickers hardness

 

Stainless steel pipe vickers hardness test indentation test is also one of the ways that can be used for the determination of thin metal materials and surface hardness, it has the major advantages of brinell, rockwell method, and overcomes the drawback of their basic, but not as rockwell method is simple, vickers method is seldom used in the steel tube standard.

 

4, hardness test

 

Above 6.0 mm, inner diameter of stainless steel tube wall thickness under the 13 mm annealing stainless steel pipes, can use W - type B75 Webster hardness tester, its testing is very rapid, simple, suitable for to do fast nondestructive inspection of qualified stainless steel pipe. Stainless steel pipe diameter greater than 30 mm, wall thickness more than 1.2 mm stainless steel tube, using rockwell hardness tester, HRB, HRC hardness test. Stainless steel pipe diameter greater than 30 mm, wall thickness less than 1.2 mm of stainless steel pipe, the surface rockwell hardness tester, test the HRT or HRN hardness, diameter less than 0 mm, greater than 4.8 mm of stainless steel pipe, pipe use special rockwell hardness tester, hardness testing HR15T, when the stainless steel pipe diameter greater than 26 mm, can also use the rockwell or surface rockwell hardness tester to test the hardness of tube wall.