METHOD FOR MANUFACTURING HOT-ROLLED STEEL HAVING EXCELLENT CORROSION RESISTANCE PROPERTY AND THE HOT-ROLLED STEEL BY THE SAME METHOD

摘要

PURPOSE: A method for manufacturing a high-strength hot rolled steel sheet with superior workability and corrosion resistance and a hot rolled steel sheet manufactured by the same are provided to obtain platability of a hot rolled steel sheet and prevent a working fail such as fluting. CONSTITUTION: A method for manufacturing a high-strength hot rolled steel sheet with superior workability and corrosion resistance comprises a step of shot blasting on the surface of a hot rolled steel sheet using shot balls of 0.1-0.4mm at a shot speed of 40-65m/sec. The hot rolled steel sheet comprises carbon of 0.01-0.10 weight%, manganese of 0.05-0.3 weight%, phosphorus of 0.001-0.020 weight%, sulfur of 0.020 weight% or less, aluminum of 0.01-0.07 weight%, nitrogen of 0.001-0.004 weight%, boron of 0.001-0.003 weight%, copper of 0.05-0.5 weight%, chrome of 0.1-0.5 weight%, and iron and inevitable impurities of the remaining amount, satisfying 0.5 (B(%)/11)/(N(%)/14) 1.5 and 7 (Cu(%)/64)/(S(%)/32) 25.