我们厂从1954年11月开始试用切屑代替废钢熔制CЧ21-40铸铁。两年来,用这种铸铁浇铸了仿苏262Γ臥式镗床的全部重要铸件,如重约3吨的床身、1.8吨的前支柱,要求较高的工作台和下拖板等。这些铸件加工后质量都很好。我们用切屑代替废钢来熔制高级铸铁,大致可分为三个阶段: Our factory from November 1954 began trial cutting chips instead of scrap melting CЧ 21-40 cast iron. In the past two years, all important castings of Imitsu-Su-262K horizontal boring machine have been cast with this kind of cast iron, such as a bed weighing about 3 tons, a 1.8-ton front pillar, a higher work bench and a lower pallet. These castings are of good quality after processing. We use the chip instead of scrap to melt high-grade cast iron, can be divided into three stages: