Process for strengthening of carbon steels

Details Process for strengthening of carbon steels Process for strengthening of carbon steels

C - Chemistry, Metallurgy

21

D

148/31

C21D 7/02 (2006.01) C21D 8/00 (2006.01)

Patent

CA 1083932

PROCESS FOR STRENGTHENING OF CARBON STEELS ABSTRACT OF THE DISCLOSURE A process for the strengthening of carbon steels wherein a hypoeutectoid carbon steel workpiece, preferably in the shape of a rod or a bar, is rapidly heated to a temperature completely within the austenite region at a rate sufficient to minimize grain growth of austenite grains, the resulting austenitized steel work- piece is quenched to transform the steel to a fine mixture of acicular pro-eutectoid ferrite and a finely divided eutectoid aggregate of ferrite and iron carbide, followed by working at a temperature ranging up to the critical lower temperature to strengthen the steel. The process of the invention provides a drastic increase in both strength and ductility as compared to untreated steels such as those obtained by hot rolling.

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