Heat treatment of steel

Metallurgical apparatus – Having means for contacting a solid metalliferous material...

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134199, C21D 162, C21D 182

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active

039892310

ABSTRACT:
A steel body at red heat or higher temperature is heat treated by sequentially carrying it through a descaling unit, where scale is removed by water jets at an impact force above 2.5 kg/cm.sup.2, and then into an accelerated cooling process such as a quench rig where it is cooled rapidly down through its transformation temperature. If the temperature is below transformation after descaling the steel body is reheated without new scale formation before passing to accelerated cooling. Cooling water and surface quality are thereby improved.

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patent: 3756869 (1973-09-01), Melloy et al.
patent: 3792844 (1974-02-01), Berry et al.

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