Jikitokuseinosuguretaichihokoseikeisokohannoseizohoho

摘要

PURPOSE:To obtain a titled unidirectional silicon steel plate by cooling a hot- rolled steel strip of a continuously cast slab of a blank steel for continuous casting of a silicon steel contg. C, Si, Mn, S or/and Se at a prescribed cooling rate after it leaves the final finishing stand then coiling the steel strip and allowing the same to cool. CONSTITUTION:A continuously cast slab of the silicon steel contg., by weight, 0.020-0.080% C, 2.5-4.0% Si, 0.02-0.10% Mn, 0.008-0.050% S or/and Se and contg. =0.1% Sb according to need is hot-rolled as follows: After said hot- rolled steel strip leaves the final stand, the steel strip is cooled down to the range of the temp. calculated from the equations I , II at 7-40 deg.C/sec cooling rate, whereafter it is coiled and is allowed to cool. If the cooling rate and coiling temp. after the hot rolling are adequately controlled, the uniform crystalline structure is effectively obtained after intermediate annealing by subjecting the hot-rolled strip to cold rolling and annealing even if it has coarse stretched grains. As a result, the perfect secondary crystal structure is formed and the uniform and excellent magnetic characteristics are obtd.