摘要 |
<p>A steel annealable at low temperature and suitable for use as the material of cold-rolled steel sheet having an excellent formability consists essentially, by weight, of not greater than 0.005% of C, not greater than 0.5% of Mn, not greater than 0.1% of P, not greater than 0.005% of N, 0.016 to 0.035% of O, with the balance being Fe and inevitable impurities, the O and at least a part of the Mn existing in the form of fine oxides dispersed substantially uniformly which oxide brings about a structure which imparts the good formability to the steel. A steel sheet may be produced by a method comprising the steps of forming a steel slab from the above-mentioned components by continuous casting, subjecting the steel slab to hot rolling to form a steel sheet, subjecting the hot-rolled steel sheet to cold rolling after pickling, and subjecting the cold-rolled steel sheet to continuous annealing at a low temperature of from 600 to 770 DEG C or to box annealing at a low temperature of from 550 to 680 DEG C.</p> |