编辑同志:去年我们用两次处理的方法试制球墨铸铁,曾获得一些成绩,制造的零件寿命延长很多,尤其是经过焖火的曲柄轴,品质非常好。最近学习了“铸工”和“机械制造”,也进行了一次处理的试验,原料是本溪3号生铁,本溪焦炭,用含镁9O%的镁块0．7%和含矽75%的矽铁1%的合金处理,成品做好后打断看,断面非常 Editor’s Comrade: Last year we tried the ductile iron with two treatments last year. We have achieved some results and the life span of the manufactured parts has been greatly prolonged. In particular, the quality of the crankshaft after stewing fire is very good. Recently learned “Casting” and “Machinery”, also conducted a treatment test, the raw material is Benxi No. 3 pig iron, Benxi coke, with magnesium 9O% of the magnesium 0.7% and 75% of silicon containing silicon 1% of the alloy processing finished finished look after the break, very cross-section