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我国变压器硅钢在1955年投入工业生产。为了提高质量,我们和生产单位合作,对冶金因素的影响、钢液真空处理的作用和不同的退火方法进行了比较系统的试验和统计。熔炼试验是在装入量15和0.5吨电弧炉上进行的。熔炼成分(%)为:C~0.06,Si4.21～4.50,Mn~0.15,P~0.015,S~0.005。统计工作基于15吨炉子的生产数据。钢液真空处理的生产试验真空度在20～50毫米汞柱之间。不同退火方法的比较是在试验室中进行的。(一)冶金因素的影响很多研究结果提到硅钢片中碳含量愈低愈好。熔炼中如何把碳迅速地降低曾有过不少研究。生产的统计指出,氧化末期采用高温薄渣吹氧去碳的操作是值得推荐的。经济指标的比较见图1,图中班组П前期脱碳用矿石、末期在高温薄渣下吹氧,指标是优越的。
China’s silicon steel transformer in 1955 into industrial production. In order to improve the quality, we have cooperated with the production units and conducted systematic tests and statistics on the influence of the metallurgical factors, the role of the molten steel in vacuum treatment and different annealing methods. The melting test was carried out on 15 and 0.5 ton EAFs. The smelting composition (%) was: C~0.06, Si4.21~4.50, Mn~0.15, P~0.015, S~0.005. The statistical work is based on the production data of 15 tons of furnaces. Vacuum liquid steel production test vacuum degree of 20 to 50 mm Hg. Comparison of different annealing methods is carried out in the laboratory. (A) the impact of metallurgical factors Many studies mentioned that the lower the carbon content of silicon steel sheet the better. There have been quite a few studies on how to quickly reduce carbon in smelting. Production statistics indicate that the use of high temperature oxidation of thin slag blowing oxygen to the carbon operation is recommended. Comparison of economic indicators shown in Figure 1, Figure Figure pre-decal group Π decarbonization ore, blowing oxygen at the end of the high-temperature thin slag, the indicator is superior.