Patent ID: 8038809

Claim:
A high-strength hot-rolled steel sheet comprising Fe and inevitable impurities and C: 0.05 to 0.15%, Si: no more than 1.50% (excluding 0%), Mn: 0.5 to 2.5%, P: no more than 0.035% (excluding 0%), S: no more than 0.01% (including 0%), Al: 0.02 to 0.15%, and Ti: 0.12 to 0.2%, wherein a metallographic structure of the steel comprises bainite of from 80 to 88 vol. % and solid solution-hardened or precipitation-hardened ferrite (or ferrite and martensite) and wherein a fracture appearance transition temperature (vTrs) of the steel is no higher than −30° C. when the temperature is obtained by an impact test (% in terms of % by weight), and the steel has a hole expandability (λ) of not less than 70%.