The properties of the casting itself directly affect the quality of the processing, and the hardness value is an important indicator for determining the casting processing.
1. Brinell hardness: mainly used to determine the hardness of castings, forgings, non-ferrous metal parts, hot-rolled billets and annealed parts, the measurement range is ≯HB450.
2. Rockwell hardness: HRA is mainly used for high hardness test pieces, and the hardness and surface hardness of HRC67 or higher, such as cemented carbide and nitrided steel, are measured. The measurement range is HRA>70. HRC is mainly used for the hardness measurement of steel parts (such as carbon steel, tool steel, alloy steel, etc.) after quenching or tempering, and the measurement range is HRC20~67.
3. Vickers hardness: used to determine the hardness of thin and steel parts, can also be used to determine the hardness of surface hardened parts such as carburizing, cyanidation and nitriding.
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