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The effect of adding alloy elements in steel is to improve the performance of steel. For example, nickel can improve the strength and not reduce the toughness of steel; chromium can improve the hardness, high temperature strength, corrosion resistance and improve the wear resistance of high carbon steel, manganese can improve the wear resistance, strength and toughness of steel, aluminum is similar to manganese, the influence is greater; vanadium can improve toughness and strength; silicon can improve the elastic limit and wear resistance, but will reduce toughness. The effect of alloying elements on steel is very complex, especially when the performance of steel needs to be added to several alloy elements. It should be noted that the excellent properties of the alloy steel not only depend on the chemical composition, but also depend on the appropriate heat treatment.