铸态薄壁中小件高强韧球铁的研制
Development of Small and Medium-sized Pieces of As-cast Thin-walled High-strength Ductile Iron
李 蒙
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作者单位：焦作大学 机电工程学院，河南 焦作 454003
中文关键字：铸态球铁； 双联熔炼； 盖包法处理
英文关键字：as-cast ductile iron； double smelting； tundish-cover nodulizing process
中文摘要：为稳定生产铸态薄壁中小件高强韧球铁,采取了以下技术措施:①合理选用化学成分；②采用冲天炉与电炉双联熔炼工艺，进行两次脱硫获得高温、低氧化、低硫的优质铁液；③使用盖包法球化处理工艺，以获得较高的球化率；④选用低稀土球化剂FeSiMg8RE3；⑤用含Sb、Ba的多元微量复合孕育剂进行孕育处理，以获得恰当的珠光体和铁素体比例。
英文摘要：In order to increase high strength and toughness of as-cast ductile iron, the following measures were tried: ① selecting rational chemical composition; ② adopting the double smelting technology of the cupola and electric furnace,carrying out the two times desulphurization to obtain low sulphur and low oxide liquid iron with high temperature; ③ using tundish-cover nodulizing process to obtain higher spheroidization rate; ④ choosing low rare earth nodulizer FeSiMg8RE3; ⑤ adopting the rational inoculation technology with Sb, Ba elements to obtain right rate of pearlite and ferrite.