Superstrength cold-rolled weathering steel sheet and method of manufacturing same

Abstract

The present invention discloses a superstrength cold rolled weathering steel sheet, wherein the weight percentage of the chemical elements thereof are as follows: C: 0.05˜0.16%; Mn: 1.00˜2.20%; Al: 0.02˜0.06%; Cu: 0.20˜0.40%; Cr: 0.40˜0.60%; Ti: 0.015˜0.035%; P: less than 0.03%; and C+Mn/16 is more than 0.19% and less than 0.23%; the remainders thereof being Fe and other unavoidable impurities. The present invention also discloses a method of manufacturing said superstrength cold rolled weathering steel sheet, comprising the following stages: smelting, heating and preservation, hot rolling, coiling, pickling, cold rolling, continuous annealing and skin passing. The advantages of the superstrength cold rolled weathering steel sheet and the method of manufacturing the same are: high strength, i.e., the yield strength more than 700 MPa and the tensile strength more than 1000 MPa; excellent performance of atmosphere corrosion resistance; thin so as to meet the demand of reducing the thickness and weight thereof; good shape and surface quality.

Dependencies are inferred from the claim text.