我厂用鋼屑代替廢鋼直接投入冲天爐来熔制高級鑄铁,已經使用兩年了。使用鋼屑以后,鑄件質量一直很稳定,从廢品率来看由3.87％(1955年全年平均数)降低到2.66％(1956年全年平均数)。鋼層对熔化过程的影响我們采用在普通氧化性爐气中重熔,由于鋼屑是零散加入的,鋼屑的表面积较大,部分的鋼屑受到爐气的氧化作用,产生下列反应: I plant with steel scrap instead of directly into the cupola furnace to melt high-grade cast iron, has been in use for two years. After using steel shavings, the quality of the castings has been very stable, from 3.87% (the annual average for 1955) to 2.66% (the 1956 whole-year averages) from the scrap rate. The impact of steel on the melting process We use the re-melting in ordinary oxidizing furnace gas, the scrap is fragmented to join the larger surface area of ​​steel scrap, the part of the steel by gas furnace oxidation, resulting in the following reaction: