Patent ID: 6062055
Filing Date: 2000-05-16
Classification: B21B,C21D

Abstract:
Rolling method for thin flat products, used in the production of flat rolled products, such as strip or sheet, with a final thickness in the range of 0.6-3.0 mm, in a plant suitable to work thicknesses of up to 25.4 mm, the method being applied to slabs with a thickness of between 50 mm and 90 mm if arriving directly from the continuous casting machine or on slabs with a greater thickness, of between 80 and 250 mm, if fed from a furnace to accumulate and heat the slabs, the method comprising conducting at least a first heat treatment to heat the slabs, then conducting a roughing or pre-finishing pass comprising one or more passes to reduce the thickness of the slabs to provide a reduced thickness product in the austenitic state, then conducting a temperature equalisation treatment, conducting a finishing pass in a finishing train comprising at least three reduction passes, controlling the temperature of the reduced thickness product in a single temperature conditioning and adjustment system either immediately before conducting the finishing pass or at an intermediate position of the finishing train to keep the reduced thickness product in the austenitic state or to transform the reduced thickness product to the ferritic state, conducting a cooling process after the finishing pass to form finished flat product, and winding the finished flat product.