大断面QT600-3球铁件的生产应用技术
Production and Application of large section ductile iron QT600-3 castings
苏华,周惦武,邵斌,刘金水,张元
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作者单位：武汉武重铸锻有限公司,湖南大学
中文关键字：大断面球铁件；电炉熔炼；增碳剂；随流瞬时孕育
英文关键字： Large section ductile iron castings; melting in furnace; recarburizer ; instantaneous bred with the flow
中文摘要：为了稳定生产QT600-3大断面球铁件，通过生产试验与调整，控制化学成分(W)：C=3.3%～3.8％，Si=2.0%～2.2%，Mn＜0.4%， S＜0.03%， P＜0.05%，RE残=0.02%～0.04%，Mg残＜0.1%，Cu=0.5%～0.7%；电炉熔炼，采用优质晶体增碳剂增加铁液成核，混合稀土球化剂进行球化处理，含RE、Ba、Sb、Ca的长效复合孕育剂在包内、浮硅及随流等多次孕育，获得金相组织、力学性能、产品品质符合要求的大断面QT600-3球铁件。
英文摘要：In order to get stable production of section ductile iron QT600-3 castings, the production test and adjustment is conducted. The result indicated that the microstructure, mechanical properties and product quality meet the requirements of large section ductile iron QT600-3 castings under the condition that the percentage of C 3.3%～3.8％, Si 2.0%～2.2%，Mn less than 0.4%， S less than 0.03%， P less than 0.05%，RE residual 0.02%～0.04%，Mg residual less than 0.1%，Cu 0.5%～0.7% in the cast iron, melting in furnace, using crystal recarburizer which is used to increase the nucleation of liquid iron, using the mixed rare earth as spheroidizer, long life composite inoculant is gestated in ladle consist of RE, Ba, Sb, Ca elements, the style of gestation is made up of such type as taphole,floating silicon, metal-stream inoculation.