HOT-ROLLED STEEL SHEET AND METHOD FOR PRODUCING SAME

摘要

A hot-rolled steel sheet satisfies that average pole density of orientation group of {100}<011> to {223}<110> is 1.0 to 5.0 and pole density of crystal orientation {332}<113> is 1.0 to 4Ø Moreover, the hot-rolled steel sheet includes, as a metallographic structure, by area%, ferrite and bainite of 30% to 99% in total and martensite of 1% to 70%. Moreover, the hot-rolled steel sheet satisfies following Expressions 1 and 2 when area fraction of the martensite is defined as fM in unit of area%, average size of the martensite is defined as dia in unit of µm, average distance between the martensite is defined as dis in unit of µm, and tensile strength of the steel sheet is defined as TS in unit of MPa. dia <= µm ... (Expression 1) TS / fM x dis / dia >= 500 ... (Expression 2)