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在真空感应炉中冶炼低碳高氧高硫易切削钢,其中氧含量的控制是一个难点。本文设计四种不同的冶炼方案,研究氧化铁皮的加入量、炉内真空度、合金加入顺序以及炉内保护气体种类等因素对钢液中氧含量的影响。结果表明,在真空度为0.1 MPa时,炉内气氛为5000 Pa氧气和96000 Pa氩气的混合气体,加入240 g氧化铁皮,同时石墨碳在合金化末期加入,钢锭中总氧含量达到250 ppm,收得率达到34.7%。实验通过合理控制合金化结束后的钢水保温时间,钢锭内部质量良好,无缩孔疏松。
Smelting low-carbon high-sulfur high-sulfur free-cutting steel in a vacuum induction furnace, in which the control of oxygen content is a difficult point. In this paper, four different smelting schemes were designed to study the effects of factors such as the amount of scale on the scale, the degree of vacuum in the furnace, the sequence of alloy addition and the kind of protective gas in the furnace on the oxygen content in the molten steel. The results show that when the degree of vacuum is 0.1 MPa, the atmosphere in the furnace is a mixture of 5000 Pa oxygen and 96000 Pa argon, and 240 g scale is added. At the same time, the graphite carbon is added at the end of alloying and the total oxygen content in the ingot reaches 250 ppm , The yield rate reached 34.7%. Through reasonable control of the alloying after the end of the steel holding time, the internal quality of the ingot, no shrinkage porosity.