A METHOD FOR MANUFACTURING GRAIN-ORIENTED ELECTRICAL STEEL SHEET WITHOUT HOT BAND ANNEALING

摘要

The present invention oriented electrical steel used in transformers, motors, generators, and other core materials of the electronics It relates to, and an object thereof is to provide a method for producing a hot-rolled sheet annealing grain-oriented electrical steel sheet by controlling a product without the addition of Al and N wt% and also controlling the cooling rate after hot rolling to the coiling section. ; The present invention for achieving the above object is, by weight%, Si: 2.9 ~ 3.4%, C: 0.01 ~ 0.06%, P: 0.015 ~ 0.035%, S: 0.001 ~ 0.010%, Mn : 0.008 ~ 0.12%, Al: 0.01 ~ 0.05%, N: 0.002 ~ 0.01%, and balance of Fe and other unavoidable impurities in the composition, the product of Al and 0.0002% by weight of the N-the steel satisfying 0.0004 1100 ~ 1200 In the re-heating and hot rolling, and then, 1 ~ 100 / sec cooling rate cooling to winding the next winding section, and then, cold rolling, and then to 850 ~ 910 in a simultaneous or separate process after the decarburization and nitriding annealing, final annealing to be made that relates to a process for the manufacture of hot-rolled sheet annealing grain-oriented electrical steel sheet according to the technical subject matter, including the omission.