Process for the improved heat treatment of steels using...

Details Process for the improved heat treatment of steels using... Process for the improved heat treatment of steels using...

C - Chemistry, Metallurgy

21

D

148/28

C21D 1/40 (2006.01) C21D 1/18 (2006.01) C21D 9/52 (2006.01)

Patent

CA 1177369

PROCESS FOR THE IMPROVED HEAT TREATMENT OF STEELS USING DIRECT ELECTRICAL RESISTANCE HEATING ABSTRACT OF THE DISCLOSURE A process for the energy efficient heat treatment of steels wherein a steel workpiece is rapidly heated to a temperature above the A3 temperature of the steel to convert the steel to austenite, the workpiece is then rapidly quenched in a liquid quench medium to convert the austenite to a predominantly martensitic microstructure, and the steel is then tempered by rapid heating while the workpiece is under tension, the tempering serving to convert the steel to a tempered martensitic form. The present invention virtually eliminates the problem of quench cracking and minimizes quench distortion as well as providing a finished product with improved uniformity, improved surface quality, and improved mechanical properties.

390652

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