| 摘要 |
Provided are: a high-tensile-strength hot-rolled plated steel sheet provided with both strength and workability (stretch flangeability and bending workability); and a method for producing same. The plated steel sheet has a plating film on at least one surface of a hot-rolled steel sheet that is the substrate, wherein the high-tensile-strength hot-rolled plated steel sheet having a tensile strength of at least 590 MPa and superior workability results by causing the hot-rolled steel sheet to have: a composition containing, by mass%, 0.010%-0.050% inclusive of C, no greater than 0.2% of Si, 0.10-0.80% inclusive of Mn, no greater than 0.025% of P, no greater than 0.01% of S, no greater than 0.01% of N, no greater than 0.1% of Al, and 0.05-0.10% inclusive of Ti in a manner so that C, S, N, and Ti satisfy Ti*/48 < C/12 (where Ti* = Ti - (N/14×48 + S/32×48), and C, S, N, and Ti represent the amount contained (mass%) of the respective elements), the remainder comprising Fe and unavoidable impurities; a matrix such that there is at least 95% by area ratio of ferrite phase with respect to the structure as a whole; and a structure such that minute carbides containing Ti and having an average grain size of less than 10 nm are dispersed/precipitated. |
