METHOD OF HEAT TREATMENT OF ROLLED PRODUCTS Russian patent published in 1997 - IPC

FIELD: heat treatment of reinforcing bars with utilization of heat of rolling heating; applicable in metallurgical industry in heat reinforcing of rolled products in flow of small-section mills. SUBSTANCE: the offered method of heat treatment of steel with utilization of heat of rolling heating including hot rolling, cyclic cooling of surface in two cycles with intermediate and final heating of surface up to temperature below point Acl and final cooling. In this case, the first cycle of overcooling is carried out for time (0.04-0.10)D s, intermediate heating for 1.0-1.8 s, and the second cycle of overcooling is carried out under conditions of equalizing for the time of (0.0150-0.05)D s, where D is diameter of feed in millimeters. EFFECT: provision of production of steels featuring high strength and ductility characteristics and containing no expansive or difficulty available alloying elements, such as manganese, nickel and the like. 1 tbl