| 摘要 |
PURPOSE:To produce a blank plat for surface treatment suitable for soft and extra-thin tin plates and tin-free steel by subjecting a continuous casting slab of an extra-low-carbon steel to hot rolling then to cold rolling and continuous annealing in an ordinary stage then subjecting the rolled sheet to wet skin pass rolling. CONSTITUTION:The continuous casting slab of the steel contg., by wt%, <0.006% C, <0.6% Mn, 0.005-0.1% Sol, Al and <0.0050% N is heated to <=1,200 deg.C and is hot-rolled in such a manner that the hot rolling ends at <=800 deg.C to form a sheet material having the uniform material quality in the transverse direction thereof. After such sheet is pickled, the sheet is subjected to cold rolling to form a thin sheet having 0.25mm thickness. The sheet is subjected to continuous annealing at 750-800 deg.C to have <=42 hardness (HR30T). The sheet is finally subjected to wet temper rolling at >=5% draft and the blank plate for surface treatment which is soft and is suitable for tin plates and tin- free steel, etc., having a non-aging characteristic is produced.
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