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SPHEROIDAL GRAPHITE CAST IRON, CAST ARTICLE AND AUTOMOBILE STRUCTURE PART MADE THEREOF, AND METHOD FOR PRODUCING SPHEROIDAL GRAPHITE CAST IRON ARTICLE
SPHEROIDAL GRAPHITE CAST IRON, CAST ARTICLE AND AUTOMOBILE STRUCTURE PART MADE THEREOF, AND METHOD FOR PRODUCING SPHEROIDAL GRAPHITE CAST IRON ARTICLE
A spheroidal graphite cast iron meeting N(5-)≥250, N(5-20)/N(5-)≥0.6, and N(30-)/N(5-)≤0.2, wherein N(5-) represents the number (/mm2) of graphite particles having equivalent-circle diameters of 5 μm or more, N(5-20) represents the number (/mm2) of graphite particles having equivalent-circle diameters of 5 μm or more and less than 20 μm, and N(30-) represents the number (/mm2) of graphite particles having equivalent-circle diameters of 30 μm or more, among graphite particles observed in an arbitrary cross section of at least 1 mm2.
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机译：满足N （5-）≥250，N （5-20） / N （5-）≥0.6的球墨铸铁，和N （30-） / N （5-）≤0.2，其中N （5-）表示数字（/ mm 2 ）的等效圆直径为5μm或更大的石墨颗粒，N （5-20）表示碳原子数（/ mm 2 ）当量圆直径为5μm以上且小于20μm的石墨颗粒，N （30-）表示具有以下值的石墨颗粒数（/ mm 2 ）在任意横截面至少为1 mm 2 的石墨颗粒中，当量圆直径为30μm或更大。
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