Hardness

Stainless steel pipe commonly used Brinell, Rockwell, Vickers hardness of three indicators to measure its hardness.

Brinell hardness

In the stainless steel pipe standard, Brinell hardness is the most widely used, often to indentation diameter to indicate the hardness of the material, both intuitive and convenient. But for harder or thinner steel pipe does not apply.

Rockwell hardness

Stainless steel tube Rockwell hardness test with Brinell hardness test, are indentation test method. The difference is that it is to measure the depth of indentation. Rockwell hardness testing is a widely used method today, with HRC second only to Brinell hardness HB in the steel pipe standard. Rockwell hardness can be applied to the determination of extremely soft to very hard metal materials, which make up for the Brinell is not, compared with the Brinell method can be directly read from the hardness of the dial dial hardness value. However, due to its indentation, the hardness value is not as accurate as the Brinell method.

Vickers hardness

Stainless steel tube Vickers hardness test is also an indentation test method can be used to determine the thin metal material and the surface layer hardness. It has the main advantages of the Brinell and Rockwell method, and overcomes their basic shortcomings, but not as easy as the Rockwell method, Vickers method rarely used in the steel pipe standard.

Hardness testing

Stainless steel pipe diameter 6.0mm above the wall thickness of the annealed stainless steel pipe in the following 13mm, you can use the W-B75 type Webster hardness tester, it is very fast and easy to test, suitable for stainless steel pipe quickly and without loss of qualified inspection. Stainless steel tube diameter greater than 30mm, wall thickness greater than 1.2mm stainless steel tube, using Rockwell hardness tester, test HRB, HRC hardness. Stainless steel tube diameter greater than 30mm, wall thickness of less than 1.2mm stainless steel tube, the use of surface Rockwell hardness tester, test HRT or HRN hardness. Internal diameter of less than 0mm, greater than 4.8mm stainless steel pipe, using a special Rockwell hardness test HR15T hardness. When the stainless steel tube diameter greater than 26mm, you can also use Rockwell or Rockwell hardness test tube wall hardness.