PURPOSE: To produce a grain-oriented silicon steel sheet excellent in surface characteristics with high productivity by subjecting a hot-rolled plate of a silicon steel containing specific amounts of C and Si and small amounts of inhibitor to cold rolling, process annealing, scarfing by grinding, and further cold rolling.
CONSTITUTION: A hot rolled plate of a silicon steel having a composition containing, by weight, 0.02-0.1% C, 2.5-4.0% Si, and small amounts of inhibitor is cold-rolled twice or more while process-annealed between the cold rolling stages so as to be formed into the final sheet thickness. Subsequently, the resulting cold-rolled sheet is subjected to decarburizing annealing and then to finish annealing, by which a grain-oriented silicon steel sheet is obtained. At this time, after the above process annealing, the surface of the steel sheet is scarfed by mechanical means, preferably, after oxide scales are removed by a mechanical or chemical method, and then, cold rolling is performed. Further, it is preferable to carry out at least the final pass in the cold rolling before decarburizing annealing by using work rolls of ≤0.30Ra surface roughness and rolling oil of 2-15cSt/50°C viscosity. By this method, high-speed rolling is made possible without deteriorating surface characteristics, and the productivity and manufacturing costs of the grain-oriented silicon steel sheet can be improved.
SUGANUMA NAMIO
NAITO TADASHI
ONO TOMOMUTSU
WAKABAYASHI KIYOSHI
MIZUKAMI SUSUMU
NAKANISHI TOSHINAGA
KURODA SHIGERU
SHIMADA KAZUO
SHITOMI MAKOTO
| JPS6059045A | 1985-04-05 | |||
| JPS6184326A | 1986-04-28 | |||
| JPS5775218A | 1982-05-11 | |||
| JPS589710A | 1983-01-20 | |||
| JPS5941482A | 1984-03-07 | |||
| JPS62252607A | 1987-11-04 | |||
| JPS60204832A | 1985-10-16 | |||
| JPS62254902A | 1987-11-06 |