| 摘要 |
PURPOSE:To increase the fatigue strength of high-Si ferritic spheroidal graphite cast iron at high temp. and to make the cast iron suitable for use at high temp. by regulating the P content to the required value and varying the Si content in the required range in accordance with the service temp. CONSTITUTION:The composition of high-Si ferritic spheroidal graphite cast iron is composed of, by weight, 2.6-3.6% C, <0.5% Mn, <0.6% Mo, 0.03-0.1% P, 3.8-6% Si, <0.15% graphite spheroidizing element and the balance Fe with inevitable impurities. The Si content is made higher than Si% calculated by substituting the service temp. for the Ac1 transformation point in the equation. |
