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  • Preliminary heat treatment: the so-called preliminary heat treatment is relative to the final heat treatment, is before the final heat treatment to increase a preparatory role of the heat treatment step, this step can provide a good final heat treatment of mechanical properties or microstructure. Common preparatory heat treatment processes include annealing, normalizing and tempering.

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  • The choice of coolant is equally important. For alloy steel, using potassium nitrate and sodium nitrite hot bath isothermal quenching or graded quenching is an effective method to reduce the deformation, especially for the treatment of complex shape, precise size requirements of the die casting mold. Some porous mold parts have the characteristics of cooling shrinkage in oil and cooling expansion in nitrate. Rational use of two different media can also reduce the deformation of parts caused by quenching.

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