HIGH-STRENGTH HOT-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME

Provided are: a high-strength hot-rolled steel sheet which, while maintaining high strength including a tensile strength TS of 1180 MPa or greater, furthermore has excellent stretch-flange formability, bending formability, and low-temperature toughness; and a method for manufacturing the same. A high-strength hot-rolled steel sheet having: a specific component composition; and a steel structure having a lower bainite phase and/or a tempered martensite phase in a total area ratio of 90% or greater as a main phase, the average grain size of the main phase being 10.0 um or less, and the amount ofFe in Fe-based precipitates being 0.70% or less in terms of % by mass; the arithmetic mean roughness (Ra) of the surface of the high-strength hot-rolled steel sheet being 2.50 um or less, and the tensile strength TS thereof being 1180 MPa or greater. 本发明提供一种高强度热轧钢板及其制造方法，该高强度热轧钢板维持拉伸强度TS为1180MPa以上的高强度的同时具有优异的拉伸翻边成型性、折弯成型性和低温韧性。高强度热轧钢板具有特定的成分组成和下述的钢组织，即上述钢组织以按合计面积率计为90％以上的下贝氏体相和/或回火马氏体相作为主相且该主相的平均粒径为10.0μm以下、Fe系析出物中的Fe量以质