Methods of seamless steel pipe hardness testing
Hardness testing of seamless steel pipe need to take into account its mechanical properties, performance and quality of this is related to the deformation of stainless steel as raw materials, stamping, cutting and other processing. Therefore, all seamless steel tubes for mechanical properties testing.Mechanical properties of the test method is mainly divided into two categories, a tensile test, hardness test.
The tensile test is the seamless steel tubes made of samples, sample in the tensile test machine will pull to fracture, then the determination of one or several mechanical properties, usually only the determination of tensile strength, yield strength, percentage elongation and section shrinkage. The tensile test the mechanical properties of metal materials, the basic test methods, almost all metallic materials, as long as the mechanical properties required to provide a tensile test. Especially those who shape is not easy material hardness test, tensile test to become only the mechanical properties testing means.
The hardness test is a hard indenter prescribed conditions slowly pressed into the surface of the sample, and then test the indentation depth or size, in order to determine the size of the material hardness. The hardness test is the mechanical performance test is the easiest, fastest and most easy to implement. Hardness test is non-destructive, the approximate conversion relationship between hardness and tensile strength values. The material's hardness value can be converted into the tensile strength values,it has great practical significance.
Tensile test is not easy to test and the strength is very convenient, so people are increasingly test hardness and less test its strength, and hardness conversion. Hardness manufacturing technology continues to progress and innovation, the original can not directly test the hardness of materials, such as seamless steel pipe, stainless steel plate and stainless steel bands, now may directly test the hardness of the Therefore, there is a hardness test is gradually replaced by the trend of the tensile test.