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【据苏联《铸造生产》1986年第6期报导】在生产中研究了用稀土过滤法净化钢液的方法。稀土和氧、硫化合物,存在于凝固前的钢液中,并以非金属夹杂的形式析出。将钢水输入粒状过滤器,能较完全地净化稀土夹杂,从而进一步提高钢的质量。试验研究了20钢(作空气冷却设备盖壳用,0.02％C,0.02％S。比钢采用碱性电弧炉—3M_2冶炼。在溶液中用硅锰、硅铁、硅钙、硅钙合金和部分铝合金
According to the Soviet Union, “Casting Production” 1986 the sixth period reported in the production of rare earth filter with the method of purification of molten steel. Rare earths and oxygen, sulfur compounds, exist in the liquid steel before solidification and precipitation in the form of non-metallic inclusions. The molten steel into the granular filter, can more completely purify rare earth inclusions, so as to further improve the quality of steel. Experimental study of the 20 steel (for air cooling equipment cover with 0.02% C, 0.02% S. Than the steel using alkaline arc furnace -3M_2 smelting in solution with silicomanganese, ferrosilicon, calcium and calcium, calcium and silicon alloy and Part of the aluminum alloy