High-strength hot-rolled plated steel

摘要

A high-strength hot-rolled plated steel sheet having a TS of 980 MPa or more, excellent elongation formability and elongation flange formability, and excellent plating properties is provided. In terms of mass%, C: 0.03 to 0.09%, Si: 0.01 to 1.60%, Mn: 2.20 to 3.60%, P: 0.100% or less, S: 0.0100% or less, Ti: 0.05 to 0.18%, B: 0.0005 to 0.0050% , Al: 0.005 to 0.40% and N: 0.010% or less, the balance consisting of Fe and inevitable impurities, 33.8[%C][%Mn]+12.4[%Si]/[%Mn] On the surface of the steel plate and the steel structure containing a component composition satisfying the indicated CSM value of 3.3 to 12.0, bainite at an area ratio of 85% or more, and martensite at an area ratio of 2.0% or more and 15.0% or less, A high-strength hot-rolled plated steel sheet provided with a plated layer or an alloyed plated layer.