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Xinchang County Aoxiang heat treatment plant practice prove, for low carbon steel workpiece, if normal heating quenching temperature pore shrinkage, shrinkage quenching heating temperature raise greater, in order to reduce the contraction to reduce the quenching heating temperature; for medium carbon alloy steel workpiece, if a normal temperature quenching after hole swell, improve the quenching temperature expansion, in order to swell the hole cavity, but also need to reduce the quenching heating temperature. For Cr12 type high alloy die steel, the quenching heating temperature increases, the amount of residual austenite is increased, and the hole cavity tends to narrow.

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