Stainless steel tank hardness test: tensile test and hardness test

The mechanical properties of stainless steel materials such as stainless steel tanks are important, and it relates to the performance and quality of deformation, stamping, cutting and the like, which are made of stainless steel. Therefore, almost all of the stainless steel materials such as stainless steel tanks are required for mechanical performance testing. Mechanical performance testing methods are mainly divided into two categories, one is the tensile test, one is the hardness test.

Tensile test is made of stainless steel material, the tensile test machine to pull the specimen to break, and then determine one or several mechanical properties, usually only the determination of tensile strength, yield strength, elongation at break and cross-section Shrinkage.

Hardness test is a hard indentation according to the provisions of the conditions slowly pressed into the sample surface, and then test the depth or size of indentation, in order to determine the size of the material hardness. The hardness test is the simplest, fastest and easiest way to implement the mechanical properties test. Hardness test is non-destructive, the material hardness value and the tensile strength value between the approximate conversion relationship.

Since the tensile test is not easy to test and is easily converted from hardness to strength, it is increasingly difficult to test the hardness of the material and test its strength. In particular, due to the continuous improvement of hardness manufacturing technology and innovation, some of the original can not directly test the hardness of the material, such as stainless steel water tank, stainless steel wire, very thin stainless steel plate and stainless steel strip, etc., are now possible to directly test the hardness The Therefore, there is a tendency for a hardness test to gradually replace the tensile test.

Most of the national standards for stainless steel materials also specify tensile tests and hardness tests. For those materials that are not difficult to carry out hardness tests, such as stainless steel tubing and wire material, only tensile tests are specified. In the stainless steel standard, the general provisions of the cloth, Los, Victoria three hardness test method, the determination of hb, hrb (or hrc) and hv hardness value, the provisions of the three hardness values ​​only one can be measured stainless steel hardness test method

In the United States metal material standards, the hardness test, there is a prominent feature, is preferred to Rockwell hardness test, supplemented by Brinell hardness test, rarely used Vickers hardness test, the United States that the Vickers hardness test Mainly should be used for metal research and thin parts of the test.

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