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苏联科洛姆纳内燃机车制造工厂已掌握制取蠕虫状石墨铸铁的工艺,它是在温度1480～1520℃时,在含硫量低于0.02%的3.0～5.0吨电炉铁水中添加稀土金属含量为30%的1号稀土中间合金0.5～0.7%、(稀土中间合金含有3～5%钇,40～50%硅)杂质和铁。中间合金放在铁水包的底部,处理时不会产生热效应和冒烟,静置6～10分钟后扒渣,浇注前在1390～1400℃时用1.0～1.2%的硅铁进行二次孕育处理。这种工艺能得到铁素体-珠光体基体、主要为蠕虫状石墨(5～20%球状
Soviet Union Kolomna diesel locomotive manufacturing plant has access to worm-like graphite cast iron process, which is at a temperature of 1480 ~ 1520 ℃, the sulfur content of less than 0.02% of the 3.0 ~ 5.0 tons of hot metal ladle add rare earth metal content 0.5% to 0.7% of No. 1 rare earth master alloy of 30%, 3 to 5% of yttrium, 40 to 50% of silicon, and iron. The middle alloy is placed on the bottom of the ladle and does not generate heat effect and smoke during the treatment. After 6 to 10 minutes of stand-in, the slag is slaked off and the secondary inoculation is carried out with 1.0 to 1.2% ferrosilicon at 1390 to 1400 ° C before pouring . This process can be ferrite - pearlite matrix, mainly worm-like graphite (5 ~ 20% spherical