| 摘要 |
PURPOSE:To obtain a titled steel plate having uniform material quality in longitudinal and width directions by ingoting steel contg. specific contents of C, SolAl, N and contg. C, N at contents having a specific relation to a slab, subjecting the slab to finish rolling at temp. higher than Ar3 and coiling the plate at high temp. higher than specific temp. CONSTITUTION:The steel contg., by weight %, 0.005-0.06 C, 0.015-0.065 SolAl, and 0.001-0.085N, and contg. C and N at the contents satisfying the relation of the inequality is ingotted to a slab. The slab is subjected to finish rolling at temp. higher than Ar3 in a hot rolling stage; then the plate is coiled at high temp. above 620 deg.C, whereby the Al killed steel plate for continuous annealing is obtained. If such steel plate is annealed continuously, the steel plate has the uniform material quality in its longitudinal and width directions. |
