| 摘要 |
PURPOSE:To obtain a product reduced in iron loss by specifying temp. rise rate at the time of heating a continuously cast slab of steel with specific composition and also specifying aging temp. and aging time in interpass at the time of cold rolling. CONSTITUTION:A continuously cast slab, consisting of, by weight, 0.015-0.100% C, 2.0-4.0% Si, 0.03-0.12% Mn, 0.010-0.065% sol.Al, 0.0040-0.0100% N, 0.005-0.050% S and/or Se, further 0.003-0.3% of one or more elements among Sb, Sn, Cu, Mo, Ge, B, Te, As, and Bi, and the balance Fe, is used. This slab is heated and soaked to and at 1320-1450 deg.C, hot-rolled, preliminarily cold-rolled, precipitation-annealed, subjected to final cold rolling consisting of plural passes, and subjected to decarburizing and primary recrystallization annealing and then to final finish annealing, by which the grain oriented silicon steel sheet can be produced. In this method, heating for the slab in a high temp. region of >=1200 deg.C is done at >=5 deg.C/min temp. rise rate, and the steel sheet is held at 150-350 deg.C for >=1min at least in one interpass in the final cold rolling stage. |
