| 摘要 |
The present invention provides a hot-rolled steel sheet having high strength and excellent ductility and stretch flangeability, and good uniformity of material in which the variation in strength in a coil is small, and a method for manufacturing the same. A slab having a steel composition including 0.020% to 0.065% of C, 0.1% or less of Si, 0.40% to less than 0.80% of Mn, 0.030% or less of P, 0.005% or less of S, 0.08% to 0.16% of Ti, 0.005% to 0.1% of Al, 0.005% or less of N, and the balance being Fe and incidental impurities, in which Ti* (= Ti - (48/14) x N) satisfies [TiC* ‰¥ 0.08] and [0.300 ‰¤ C/Ti* ‰¤ 0.375], is subjected to hot rolling to obtain a hot-rolled steel sheet in which the steel microstructure includes, in terms of area fraction, 95% or more of a ferrite phase; the average ferrite grain size is 10 µm or less; the average grain size of Ti carbides precipitated in steel is 10 nm or less; and Ti in the amount of 80% or more of Ti* is precipitated as Ti carbides. |
