【摘要】 无镁稀土球墨铸铁采用国内资源丰富的稀土作球化剂,完全不用主要靠进口的镁,工厂可直接用包钢一号稀土硅铁合金生产球铁,不需自行熔制稀土镁合金.由于采用了新的球化处理工艺——包底吹氮气法(此法可连续完成脱硫、球化与孕育处理.稀土吸收率高,劳动条件好),同时还试成了炉前准确控制残留稀土量的方法,因而球化稳定,机械性能良好;耐磨性比含镁球铁更佳;皮下气孔倾向比含镁球铁小.但大断面中石墨球的圆整度和大小均匀性似乎稍差.更多还原

【Abstract】 Rare-earth nodular iron uses the rich home sources of rare-earth elements as nodulizing agent instead of the mainly imported magnesium. Factories can use directly the rare-earth ferrosilicon No.1 of the Baotou Steel Plant to produce nodular iron without having to remelt the rare-earth-magnesium alloy. The spheroidization is reliable because of the application of a new nodulizing technique-blowing N₂ through the bottom of the ladle. （By this method desulfurization, nodulization and inoculation can be done continuously. The pick-up of rare-earth is good, and the working conditions for the workers improved）. In addition, a method for controlling accurately the residual rare-earth amount is develped. In consequence th（?） nodulizing effect is reliable, the mechanical properties of the iron are excellent, the wear resistance is better than that of iron containing Mg, and the tendency to form under-skin holes is lower than in the case of iron containing Mg. The perfectness of sphericity and the homogeneity of eize of the nodules seem to be rather poor.更多还原