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1. Reasonable combination of strength and toughness. Generally speaking, the strength and toughness of steel materials are against each other. For structural forgings, a impact toughness is often used as a security judgment. Pursuing high toughness indicators without sacrificing intensity, resulting in a huge volume of mechanical products and a short service life. On the contrary, for the industrial mold, in order to improve the abrasion resistance, the pursuit of high hardness and high intensity (anti-twist strength), it ignores the effects of toughness on reducing mold collapse and fracture, and the service life is not long. Therefore, the working conditions and failure forms of the forging should be surveyed, and the strong tough indicators should be determined according to the reasonable combination of strong toughness.