stainless steel Guallo hardness test, like the Brinell hardness test, are indentation test methods. The difference is that it is to measure the depth of indentation, Luo hardness test is currently widely used method, of which HRC in the steel pipe standard is second only to Brinell hardness HB, Luo hardness can be applied to the determination of metal materials from extremely soft to very hard, it makes up for the Brinell method is not, more simple than the Brinell method, can be directly from the Hardness machine dial to read the However, due to its small indentation, the hardness value is not as accurate as the Brinell method.
2, Brinell hardness
in the stainless steel pipe standard, Brinell hardness is the most widely used, often with indentation diameter to indicate the hardness of the material, both intuitive and convenient, but for the harder or thinner steel pipe is not applicable.
3, Vickers hardness stainless steel Tauvi hardness test is also a indentation test method, can be used to determine very thin metal materials and surface layer hardness, it has the main advantages of Brinell, Rockwell method, and overcome their basic shortcomings, but not as simple as Luo method, Vickers method is rarely used in steel pipe standards.
4, hardness testing stainless steel pipe inner diameter of more than 6.0mm, wall thickness under 13mm annealing stainless steel pipe, can be used w-b75 type Webster hardness meter, it testing is very fast, simple, suitable for stainless steel pipe to do fast non-destructive qualified inspection. Stainless steel tube diameter greater than 30mm, wall thickness greater than 1.2mm stainless steel pipe, the use of Luo hardness meter, test HRB, HRC hardness. Stainless steel tube diameter greater than 30mm, wall thickness less than 1.2mm stainless steel pipe, the use of surface Luo hardness meter, test HRT or hrn hardness, inner diameter less than 0mm, greater than 4.8mm stainless steel pipe, the use of pipe special Luo hardness meter, test hr15t hardness, when the diameter of stainless steel tube is greater than 26mm, The hardness of the inner wall of the pipe can also be tested with the Rockwell or surface Roche hardness meter.