| 摘要 |
A novel spheroidal graphite alloy cast iron for high temperature engine parts has the composition 2.7-3.4 (preferably 2.9-3.2)% C, 4.4-5.4 (preferably 4.6-4.9)% Si, 0.4-1.2 (preferably 1.0-1.2)% Ni, /}0.5% Cr, 0.7-1.4 (preferably 0.8-0.9)% Mo, /}0.5% Mn, 0.03-0.08% Mg, balance Fe and usual trace elements. Preferably, the sum of Si, Ni and Mo is 5.8-7.0%. The cast iron is produced by the usual process for grey cast iron with spheroidal graphite, but inoculation is preferably carried out at several points, i.e. inoculation with 0.3-0.4% FeSi 75 in the casting equipment and inoculation with 0.2% FeSi 75 in the mould, to give reproducible quality with finely distributed graphite spheroids of 6-8 size.
|
