| 摘要 |
PURPOSE:To provide the titled spheroidal graphite cast iron having improved wear resistance in addition to strength and toughness by adding slightly an adequate amt. of >=1 kind among Zr, V, Ti, W, B and Nb to the specifically composed basic component consisting of C, Si, Mn, Mg and Fe. CONSTITUTION:At least >=1 kind among 0.05-1.0% Zr, 0.05-0.3% V, 0.05- 0.3% Ti, 0.01-0.3% W, 0.002-0.015% B and 0.04-0.3% Nb are added to the basic component consisting of 3.0-4.5wt% C, 1.5-3.0% Si, 0.2-1.0% Mn, 0.02- 0.10% Mg and the balance substantially Fe, by which a spheroidal graphite cast iron for austempering having improved wear resistance in addition to strength and toughness is obtd. The Zr, V, Ti, W, B, Nb, etc. added to the spheroidal graphite cast iron are dispersed and precipitated as carbide and carbonitride by austempering and these fine and hard particles are held by the matrix having high strength and high toughness, by which the wear resistance of the above- mentioned cast iron is improved.
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