The properties of casting itself directly affect the quality of processing, the hardness value is decided an important indicator of casting processing.
Brinell hardness: mainly used for determination of casting, forging, non-ferrous metal parts, the hardness of hot rolled billet and annealing, measurement range ≯ HB450.
2. Rockwell hardness: HRA is mainly used for high hardness of the specimen, determine the materials and surface hardness hardness is higher than HRC67 above, such as cemented carbide and nitride steel, measurement range HRA > 70. HRC is mainly used for steel parts (such as carbon steel, tool steel, alloy steel, etc.) after quenching and tempering hardness measurement, measurement range HRC20 ~ 67.
3. The vickers hardness: used to determine the hardness and steel parts of the thin, also can be used to determination of carburizing, cyaniding, nitriding, etc. The hardness of surface hardening.
