Method for manufacturing high magnetic induction grain-oriented silicon steel through short-process medium and thin slab

一种短流程中薄板坯制备高磁感取向硅钢的方法

Abstract

本发明公开一种短流程中薄板坯制备高磁感取向硅钢的方法,包括铁水预处理→冶炼→LF炉外精炼→中薄板坯连铸连轧→常化酸洗→冷轧→脱碳退火及涂MgO→高温退火→热拉伸平整及涂绝缘层→重卷包装;钢的成分按重量百分比为C0.01~0.1,Si2.5~3.5,Mn0.05~0.20,P0.005~0.02,S0.005~0.03,Als0.005~0.02,N0.006~0.010,余量为Fe和不可避免杂质。热轧后工序综合成材率提高5%以上,磁感B8提高到1.88T以上,铁损P1.7降低至1.20W/kg以下。
The invention discloses a method for manufacturing high magnetic induction grain-oriented silicon steel through a short-process medium and thin slab. The method comprises hot metal pretreatment, smelting, LF furnace external refining, medium and thin slab continuous casting and rolling, normalizing acid pickling, cold rolling, decarburizing annealing and MgO coating, high-temperature annealing, hot stretching leveling and insulation layer coating and rewinding packaging. The steel comprises the following components according to the weight percent ratio: 0.01 to 0.1 of C, 2.5 to 3.5 of Si, 0.05 to 0.20 of Mn, 0.005 to 0.02 of P, 0.005 to 0.03 of S, 0.005 to 0.02 of Als, 0.006 to 0.10 of N, the balanced of Fe and inevitable impurities. The process overall finished product yield after hot rolling is improved by more than 5 percent, magnetic induction B8 is improved to be more than 1.88T, and the iron loss P1.7 is reduced to below 1.20W/kg.

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