| 摘要 |
PURPOSE:To increase the strength of a cylinder liner without deteriorating the service characteristics of the inside of the liner by combining an inner layer having a specified composition and showing superior wear resistance and seizing resistance with an outer layer of malleable cast iron having a specified composition and showing superior toughness and hardness so as to form the cylinder liner as a composite one. CONSTITUTION:An outer layer (a) of malleable cast iron consisting of, by weight, 2.0-2.8% C, 0.7-2.5% Si, 0.3-1.2% Mn, <=0.2% P, <=0.2% S, <=3.0% Ni, 0.1-1.0% Cr, <=0.7% Mo and the balance Fe is formed, and an inner layer (b) consisting of, by weight, 2.5-4.0% C, 0.8-2.5% Si, 0.3-1.5% Mn, 0.05-1.5% P, <=0.3% S, <=2.5% Ni, <=1.5% Cr, <=0.8% Mo, <=0.5 Sn, <=4.0% Cu, <=1.0% one or more among B, Ti, V, Nb and Zr, <=0.2% one or more among Al, Ca, Ba, Sr and a rare earth element, and the balance Fe is formed. The layers (a), (b) are then united to one body by melt bonding to obtain a composite cylinder liner.
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