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    • 92. 发明授权
    • Method of producing spheroidal graphite cast iron article
    • 生产球墨铸铁制品的方法
    • US5186233A
    • 1993-02-16
    • US862230
    • 1992-04-02
    • Fumio ObataToshiaki TanakaHideaki Nagayoshi
    • Fumio ObataToshiaki TanakaHideaki Nagayoshi
    • C21C1/10C22C33/08
    • C22C33/08
    • A spheroidal graphite cast iron article having a thin portion and a thick portion, the number of spheroidal graphite particles having a diameter of 2 .mu.m or more being 600 /mm.sup.2 or more and less than 2000 /mm.sup.2 in the thin portion and 130 /mm.sup.2 or more and less than 600 /mm.sup.2 in the thick portion, and spheroidization percentage being 70% or more in the thick portion, is produced by a method comprising the steps of: (a) preparing an iron-base alloy melt having a composition consisting essentially by weight of 3.0-4.0% of C, 0.8-1.7% of Si, 1.0% or less of Mn, 0.2% or less of P, 0.01-0.2% of S, the balance being substantially Fe and inevitable impurities; (b) desulfurizing the iron-base alloy melt to control the sulfur content of the melt to less that 0.01% by weight; (c) adding a sulfur-containing material to the melt in such an amount that the sulfur content of the melt becomes 0.011-0.03% by weight; and (d) adding an Mg-containing material and a lanthanide element to the melt to conduct a spheroidizing treatment.
    • 具有薄壁部分和厚壁部分的球墨铸铁制品,薄壁部分的直径为2μm或更大的球形石墨颗粒的数量为600 / mm 2或更小且小于2000 / mm 2,而130 / mm 2 或更多且小于600 / mm 2的厚部分,并且厚部分中的球化百分比为70%以上,是通过包括以下步骤的方法制备的:(a)制备具有以下组成的铁基合金熔体: 基本上重量为3.0-4.0%的C,0.8-1.7%的Si,1.0%或更少的Mn,0.2%或更少的P,0.01-0.2%的S,余量基本上是Fe和不可避免的杂质; (b)将铁基合金熔体脱硫以将熔体的硫含量控制在0.01重量%以下; (c)将熔体中的含硫物质加入到熔体中,使得熔体的硫含量为0.011-0.03重量%; 和(d)向熔体中加入含Mg材料和镧系元素进行球化处理。