| 摘要 |
PURPOSE:To produce inexpensively a titled steel sheet having good quality, by casting continuously a dead soft steel contg. Mn and Ti at the amt. of addition controlled in such a way that the effective Ti satisfies specific conditions and subjecting the steel to recrystallization annealing after hot rolling and cold rolling. CONSTITUTION:The steel contg., by weight %, 0.002-0.006% C and 0.01-0.10% Mn and is incorporated with Ti at the effective content content Ti* of Ti expressed by the formula I in a way as to satisfy the formula II is continuously cast to a continuous casting slab. The continuous casting slab is hot-rolled at <=780 deg.C finish hot rolling temp. The hot rolled steel sheet is cold-rolled in accordance with a conventional method and is then subjected to recrystallization annealing at the recrystallization temp. or above and <=1,000 deg.C as it is or after Ni plating is applied at 0.1-2.0g/m<2> on the surface of the cold-rolled steel sheet. |
