| 摘要 |
PURPOSE:To stably manufacture a high-silicon hot-rolled steel plate excellent in cold workability, by using a hot rolling machine with a specific roll diameter so as to form a structure which is uniform in the direction of plate thickness, at the time of subjecting a silicon steel plate with a specific composition to continuous finish hot rolling. CONSTITUTION:An alloy consisting of, by weight, <=1% C, 4.0-7.0% Si, <=0.5% Mn, <=2% Al, and the balance Fe with inevitable impurities is refined. This alloy is subjected to ingot-making or continuous casting and then to slabbing and hot roughing or to roughing and finish hot rolling. At the time of this finish hot rolling, rolling is carried out by the use of rolls having a diameter 20 times the thickness of the plate to be inserted or more. It is preferable that temp. range is regulated to 500-1,100 deg.C. After finish hot rolling, a surface oxide film is removed, and then cold rolling and annealing are applied. In this way, the control of hot-rolled structure at the time of finish hot rolling is facilitated, so that high-silicon steel plate excellent in cold workability can be efficiently manufactured. |
