The mechanical properties of stainless steel carbon steel storage tanks are very important, which is related to the performance and quality of deformation, stamping, cutting and other processing using stainless steel as raw material. Therefore, almost all stainless steel storage tanks require mechanical property testing. Mechanical property testing methods are mainly divided into two categories, one is tensile test and the other is hardness test.
       The tensile test is to make a stainless steel carbon steel storage tank into a specimen, pull the specimen until it breaks on a tensile testing machine, and then measure one or several mechanical properties. Usually only tensile strength, yield strength, elongation after fracture and shrinkage of area are measured.
       The hardness test is to slowly press a hard indenter into the surface of the sample under specified conditions, and then test the depth or size of the indentation to determine the hardness of the tank. Hardness test is a simple, rapid and easy-to-implement method in the mechanical performance test of storage tanks. The hardness test is non-destructive, and there is an approximate conversion relationship between the tank hardness value and the tensile strength value.
       Since the tensile test is inconvenient to test and it is convenient to convert hardness to strength, people are increasingly testing only the hardness of storage tanks and less often their strength. Especially due to the continuous advancement and innovation of hardness tester manufacturing technology Newly, it is now possible to directly test the hardness of some storage tanks that could not be directly tested for hardness, such as stainless steel pipes, stainless steel wires, thin stainless steel plates and stainless steel strips. Therefore, there is a trend that hardness testing gradually replaces tensile testing.
       Most of the national standards for stainless steel carbon steel storage tanks stipulate both tensile testing and hardness testing. For those tanks where hardness testing is inconvenient, such as stainless steel pipes and wires, only tensile testing is specified. In stainless steel standards, three hardness testing methods, including Bu, Luo and Wei, are generally specified.hb,hrb(orhrc)andhvThe hardness value stipulates that only one of the three hardness values ​​can be measured to detect the hardness of stainless steel.