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目前,汽车排放系统零部件主要采用耐热铸铁,包括中硅(或中钼)耐热球墨铸铁、硅钼铬耐热球墨铸铁、高镍奥氏体球墨铸铁等。这些材料具有良好的高温强度和抗氧化性,可以满足在不同温度范围工作的使用要求,为汽车排放系统制造商广泛采用。这些耐热铸铁液态流动性差,浇注温度高,球化温度高达1600℃,容易引起球化和孕育衰退,因此球化剂和孕育剂的选用尤为重要,一般选用镁吸收率高、氧化镁含量低的球
At present, automotive exhaust system components are mainly made of heat-resistant cast iron, including heat-resistant ductile iron in silicon (or molybdenum), heat-resistant ductile iron in silicon molybdenum and chromium, and ductile iron in high-nickel austenitics. These materials have good high temperature strength and oxidation resistance, to meet the requirements of the work in different temperature ranges, widely used for automobile emission system manufacturers. These heat-resistant cast iron liquidity is poor, pouring temperature is high, the ball temperature up to 1600 ℃, easily lead to the ball and the recession, so nociceptive and inoculant selection is particularly important, the general choice of high magnesium absorption, low magnesium oxide content The ball