HOT-ROLLED STEEL SHEET FOR TAILORED ROLLED BLANK AND TAILORED ROLLED BLANK

摘要

A hot-rolled steel sheet has a chemical composition that contains, in mass %, C, Si, Mn, P, S, Al, N and Ti, and that satisfies Formula (1); and a microstructure containing bainite and ferrite. In the interior of the steel sheet an average value of pole densities of an orientation group {100}011 to {223}110 is 4 or less, and a pole density of a {332}113 crystal orientation is 4.8 or less. In an outer layer of the steel sheet, a pole density of a {110}001 crystal orientation is 2.5 or more. Furthermore, among Ti carbo-nitrides in the steel sheet, the number density of fine Ti carbo-nitrides having a particle diameter of 10 nm or less is 1.0×10¹⁷ per cm³ or less, and a bake hardening amount is 15 MPa or more.; [Ti]−48/14×[N]−48/32×[S]≥0  (1)