It is stipulated that cemented carbide balls with different diameters shall be used as test balls, and steel balls shall not be used as test balls. The upper limit of Brinell hardness test can reach 650 HBW. Generally, it can be used to test the hardness of annealed, normalized and quenched and tempered parts. Under special conditions, it can also be used to test the hardness value of other heat treatment of steel parts. For iron castings, the diameter of cemented carbide is generally 2.5 mm, 5 mm and 10 mm hammer type hardness tester, but Brinell hardness measurement method should not be used for finished products.