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    • 26. 发明授权
    • Method for manufacturing non-oriented electrical steel sheet showing
superior adherence of insulating coated layer
    • 制造无取向电工钢板的方法,其表现出优异的绝缘涂层粘附性
    • US5803988A
    • 1998-09-08
    • US894394
    • 1997-08-18
    • Byung Keun BaeSam Kyu ChangJong Soo WooWun Gul Lee
    • Byung Keun BaeSam Kyu ChangJong Soo WooWun Gul Lee
    • C21D3/04C21D8/12C22C38/02H01F1/147H01F1/18
    • C21D8/1288C21D8/1272C21D8/1277H01F1/147H01F1/18C21D3/04
    • The annealing conditions of a cold rolled steel sheet are properly controlled so as to form a dense surface oxide layer, thereby improving the adherence strength of the insulating layer on non-oriented electrical steel sheet. The method includes the following steps. A steel slab is prepared which is composed of in weight %: 0.05% or less of C, 3.5% or less of Si, 1.5% or less of Mn, 0.15% or less of P, 0.015% or less of S, 1.0% or less of Al, one or more elements selected from a group consisting of 0.03-0.30% of Sn, 0.03-0.3% of Sb, 0.03-1.0% of Ni and 0.03-0.50% of Cu, the balance of Fe and unavoidable impurities. The steel slab is reheated, hot rolled, pickled after annealing or without annealing and cold-rolled. A low temperature annealing is carried out on the cold rolled steel sheet at a temperature of 750.degree.-850.degree. C. for 30 seconds to 5 minutes under a humid atmosphere having a dew point of 25.degree.-65.degree. C. A high temperature annealing is carried out on the low-temperature-annealed cold rolled steel sheet at a temperature of 800.degree.-1070.degree. C. for 10 seconds to 3 minutes under a dry atmosphere having a dew point of 0.degree. C. or below. Insulating layers are coated on the surfaces of the high-temperature-annealed steel sheet, and a hardening heat treatment is carried out on the steel sheet.
    • PCT No.PCT / KR96 / 00078 Sec。 371日期:1997年8月18日 102(e)1997年8月18日PCT PCT 1996年6月1日PCT公布。 公开号WO97 / 22723 日期1996年6月26日冷轧钢板的退火条件被适当地控制,以形成致密的表面氧化物层,从而提高无取向电工钢板上的绝缘层的粘附强度。 该方法包括以下步骤。 制备钢板,其重量%:C:0.05%以下,Si:3.5%以下,Mn:1.5%以下,P:0.15%以下,S:0.015%以下,1.0% 或更少的Al,一种或多种选自Sn,0.03-0.30%的Sn,0.03-0.3%的Sb,0.03-1.0%的Ni和0.03-0.50%的Cu,其余的Fe和不可避免的杂质 。 再次加热,热轧,退火或不退火冷轧后酸洗。 在露点为25〜-65℃的潮湿气氛下,在750〜-850℃的温度下对冷轧钢板进行低温退火30秒〜5分钟。高温退火 在露点为0℃以下的干燥气氛下,在800〜-1070℃的温度下在低温退火冷轧钢板上进行10秒钟〜3分钟。 在高温退火钢板的表面上涂布绝缘层,对钢板进行硬化热处理。