| 摘要 |
PURPOSE:To easily produce a high strength casting of spheroidal graphite cast iron by taking a casting of spheroidal graphite cast iron having restricted Ni, Cu and Mo contents out of a casting mold, heating the casting to the austenitizing temp., and cooling it to a specified temp. by forced air cooling. CONSTITUTION:Molten spheroidal graphite cast iron contg. 0.5-2.0wt% Ni, 1.0-3.0wt% Cu and 0.3-2.0wt% Mo is poured into a casting mold. The resulting casting is taken out of the mold and heated to the austenitizing temp. The casting is then cooled to the Ms point - 400 deg.C by forced air cooling and allowed to cool. Thus, the matrix structure of the casting is easily converted into a bainite structure without using an austempering furnace, so the strength of the casting of spheroidal graphite cast iron is increased.
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