Patent ID: 8486205

Claim:
A high-strength hot-rolled steel sheet containing (% in terms of % by weight): C: 0.02 to 0.10%, Si: no more than 1.50% (excluding 0%), Mn: 0.5 to 2.0%, P: no more than 0.025% (excluding 0%), S: no more than 0.01% (including 0%), Al: 0.020 to 0.15%, Ni: 0.1 to 1%, Cr: 0.1 to 1%, Nb: 0.01 to 0.08%, and Ti: 0.05 to 0.2%, with the remainder comprising Fe and inevitable impurities; which high-strength hot-rolled steel sheet is characterized in that its metallographic structure comprises ferrite of 90% by area or more, its fracture appearance transition temperature (vTrs) is no higher than 0° C. as obtained by impact tests, and its tensile strength is 780 MPa or more.