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

FIELD: ferrous metallurgy, in particular, heat treatment of reinforcing bars with utilization of heat of rolled product heating; applicable in heat hardening in flow of small-section mills. SUBSTANCE: to obtain the required strength and ductility characteristics, with high impact strength at subzero temperatures, technology of heat treatment of steel is offered with utilization of heat of rolling heating, including hot rolling, preliminary cooling of feed to temperature of Ar3+(20-50) C with holding for (0.025-0.115)D s, cyclic cooling of surface for (0.015-0.035)D s to temperature Mn+(20-100) C in each cycle with, at least, two cycles and intermediate and final heating of surface to temperature below temperature Acl and final cooling; where D is feed diameter. EFFECT: higher efficiency. 1 cl, 1 tbl