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A method for the production of grain oriented electromagnetic steel sheet metal plates by means of rapid quenching and solidification
A method for the production of grain oriented electromagnetic steel sheet metal plates by means of rapid quenching and solidification
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机译：一种快速淬火固化的晶粒取向电磁钢板的生产方法
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摘要
The present invention concerns a process for producing a grain-oriented electrical steel sheets by means of a rapid quench-solidification process, for example, a continuous casting by a twin roll strip caster. The feature of the present invention resides in quenching to solidify molten steels into a thin cast sheet of 0.7 to 3.0 mm thickness, at a cooling rate of greater than 50°C/sec. in the central portion along the direction of thickness of the thin cast sheet, cooling the sheet at a cooling rate of greater than 10°C/sec. in a temperature range between 1300 to 900°C and then applying cold rolling for once or twice or more including intermediate annealing under a final cold rolling reduction rate of not less than 80%. In the present invention, precipitate that function as an inhibitor can finely be dispersed by adding 0.02 to 0.2% of Nb into the molten steel ingredients thereby stably produce a grain-oriented electrical steel sheet of high magnetic flux density by means of a rapid quench-solidification process. Further, since thin cast sheet of desired thickness within a range from 0.7 to 3.0 mm can be produced by the rapid quench-solidification process, thin cast sheet can be cold rolled to a final thickness of less than 150 µm by applying a cold rolling at a reduction rate optimum to magnetic properties, as well as an extremely thin grain-oriented electrical steel sheet of less than 150 µm (0.15 mm) thickness can be produced in a simple production process and at a reduced cost, which has been remarkably difficult to produce and required expensive cost so far.
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