| 摘要 |
<p>The invention provides a cast iron alloy comprising 3.0 - 3.8 % carbon, 0.6 - 2.5 % silicon, 0.2 - 0.65 % manganese, 0.01 - 0.1 % tin, <0.025 % sulfur, 0.001 - 0.020 % magnesium, 0.1 - 1.2 % copper, 0.04 - 0.2 % chromium, and balance up to 100 % of iron and incidental impurities. The matrix structure is a continuously variable ferrite/pearlite mixture and the content of carbides is less than 1 %. The graphite shape of the alloy is 1 - 50 % flake graphite, 50 - 99 % compacted graphite and at most 10 % spheroidal graphite. Such an alloy is easier to machine and less prone to shrinkage than an ordinary compacted graphite cast iron.</p> |
