Controlled rolling process for dual phase steels and...

Details Controlled rolling process for dual phase steels and... Controlled rolling process for dual phase steels and...

C - Chemistry, Metallurgy

21

D

148/34

C21D 8/00 (2006.01) C21D 8/02 (2006.01) C21D 8/06 (2006.01) C21D 1/18 (2006.01)

Patent

CA 1249207

ABSTRACT An improved, energy efficient, hot rolling method for direct production of cold formable dual-phase steel is provided. The steel is heated to completely austenitize it and then continuously hot rolled and cooled down into the ferrite-austenite two phase region to a temperature which is just below the effective Ar3 temperature. The hot rolled steel is then rapidly quenched to provide an alloy containing strong, tough lath martensite (fibers) in a ductile soft ferrite matrix. The method is particularly useful for providing rods in which form the alloy is capable of being drawn into high strength wire or the like in a cold drawing operation without any intermediate annealing or patenting, and has excellent strength, ductility and fatigue characteristics.

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