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三、蠕墨铸铁的铸造性能和工艺特点 1.流动性同其他铸铁一样,蠕墨铸铁的流动性取决于碳当量和浇注温度。蠕墨铸铁由于它的碳当量高(4.3～4.6％),同时又由于稀土、镁、钙元素的脱氧、除气等净化铁水的作用。所以在相同浇注温度下,它具有良好的流动性(表3)。但是在蠕化处理中,蠕化剂的加入使铁水的温度降低,这时流动性反而比灰铸铁低。因此。为确保流动性,应该提高出铁温度(希望出铁温度在1420～1450℃)。 2.缩孔蠕墨铸铁的初期膨胀值介于球铁和灰铁之间,相应的体收缩也是如此(表4)。与高牌
Third, the compacted graphite cast iron casting performance and process characteristics 1. Mobility Like other cast iron, vermicular graphite cast iron mobility depends on the carbon equivalent and pouring temperature. Compacted graphite cast iron due to its high carbon equivalent (4.3 ~ 4.6%), but also due to rare earth, magnesium, calcium deoxidation, degassing, such as the role of purification of hot metal. So at the same pouring temperature, it has good fluidity (Table 3). However, in the vermicular treatment, the addition of the vermiculite reduces the temperature of the hot metal and the fluidity is lower than the gray cast iron. therefore. In order to ensure liquidity, the tapping temperature should be increased (the tapping temperature is desired to be in the range of 1420 to 1450 ° C). 2. Shrinkage Compacted graphite cast iron initial expansion between the ductile iron and gray iron, the corresponding body contraction as well (Table 4). With a high card