In this design, the core and cavity of the soap box are made of Cr12MoV steel, because it has high hardenability, and its cross section can be completely hardened below 300 ~ 400㎜, and it can still maintain good hardness and wear resistance at 300 ~ 400℃. The toughness of Cr12MoV steel is stronger than that of Cr12, and the volume change of Cr12MoV steel is the smallest when quenching, so it can be used to manufacture large cross section and complex shape. Therefore, it is more suitable to choose Cr12MoV steel.
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