采用中频无芯感应电炉熔炼工艺,选用低稀土球化剂进行盖包法球化处理以及复合孕育处理等关键工艺,稳定生产出合格的球墨铸铁件。生产结果:铸件抗拉强度σb≥550 MPa,伸长率δ≥6%,基体为铁素体和珠光体混合基体,球化级别2~3级,石墨球大小6~7级,达到或超过国家标准。并且进行了批量生产,取得了良好的社会经济效益。 IF coreless induction furnace smelting process, the selection of low rare earth nodulizer for the cover of the ball processing and compound inoculation and other key processes, stable production of qualified ductile iron pieces. Production results: Castings tensile strength σb ≥ 550 MPa, elongation δ ≥ 6%, the matrix of ferrite and pearlite matrix, the ball level 2 to 3, graphite ball size 6 to 7, to meet or exceed National standard. And carried out mass production, and achieved good social and economic benefits.