| 摘要 |
<p>In a hot-rolled steel sheet, an average pole density of an orientation group {100}<011> to {223}<110>, which is represented by an arithmetic mean of pole densities of orientations {100}<011>, {116}<110>, {114}<110>, {112}<110>, and {223}<110> is 1.0 to 4.0 and a pole density of a crystal orientation {332}<113> is 1.0 to 4.8, in a thickness center portion which is a thickness range of 5/8 to 3/8 from the surface of the steel sheet; an average grain size in the thickness center portion is less than or equal to 10 mum and a grain size of cementite precipitating in a grain boundary of the steel sheet is less than or equal to 2 mum; and an average grain size of precipitates containing TiC in grains is less than or equal to 3 nm and a number density per unit volume is greater than or equal to 1×1016 grains/cm3.</p> |
