| 摘要 |
A spheroidal graphite cast iron having (a) a composition comprising by mass 3.4-4% of C, 1.9-2.8% of Si, 0.02-0.06% ofMg, 0.2-1% ofMn, 0.2-2% of Cu, 0-0.1% of Sn, 0.85-3% of (Mn + Cu + 10 x Sn), 0.05% or less of P, and 0.02% or less of S, the balance being Fe and inevitable impurities, and (b) a duplex matrix structure comprising by area 2-40% of fine ferrite phases and 60-98% of fine pearlite phases, the maximum length of the ferrite phases being 300 µm or less, and (c) the pearlite phases being formed around graphite particles dispersed in the duplex matrix structure. |
