Hardness testing of cemented carbide mainly adopts Rockwell hardness tester to test HRA hardness value. Phr Series Portable Rockwell hardness tester is very suitable for testing the hardness of cemented carbide. The weight accuracy of the instrument is the same as that of the bench Rockwell hardness tester, which is very convenient to use and carry. Cemented carbide is a kind of metal. The hardness test can reflect the differences of mechanical properties of cemented carbide materials under different chemical composition, microstructure and heat treatment process conditions. Therefore, hardness test is widely used to test the properties of cemented carbide, supervise the correctness of heat treatment process and study new materials. It belongs to non-destructive test, and the test method is relatively simple. The hardness test of cemented carbide has strong adaptability to the shape and size of its test pieces and high test efficiency. In addition, there is a certain corresponding relationship between the hardness of cemented carbide materials and other physical properties. For example, the hardness test and tensile test of cemented carbide are basically to test the ability of metals to resist plastic deformation. To some extent, these two tests are to test the similar characteristics of metals. Therefore, the test results can be compared with each other. Cemented carbide tensile test equipment is huge, complex to operate, sample preparation is required, and the test efficiency is low. For many metal materials, there is a conversion table for hardness test and tensile test. Therefore, when testing the mechanical properties of cemented carbide materials, more and more hardness tests are used, and less tensile tests are used.