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 Shock-resisting tool steels are designated as group S steels according to the AISI classification system. These steels include S1, S2, S5, S6, and S7 types. The hardenability of group S steels can be controlled by varying thier composition rather than adjusting the melting methods and grain size. They can obtain optimum hardness at higher austenitizing temperatures. The tempering resistance of group S steels can be enhanced by the addition of silicon, which also forms a microstructure to resist distortion in tempered conditions.