| 摘要 |
PURPOSE:To obtain a delayed aging steel sheet for slight working having superior burning hardenability by regulating the composition of a steel and controlling the hot rolling, coiling and annealing temps. CONSTITUTION:The composition of a steel contg., by weight, 0.02-0.12% C, <=0.02% S and 0.002-0.006% N is regulated so that the amounts of Mn, S, O and Al in the steel satisfy formulae I, II. A slab of the steel is heated to >=1,100 deg.C, hot rolled, coiled at 300-600 deg.C and cold rolled. The resulting cold rolled steel sheet is continuously annealed by heating to the recrystallization temp. - 750 deg.C and soaking for <=1min.
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