我厂采用铸态高韧性球铁制造一吨翻斗车前桥壳体等零件,其工艺简单、性能稳定,降低了成本,提高了效率,机械性能达到或超过了QT50—5的要求。一、对铸态高韧性球铁化学成分的选择1.碳、硅含量的确定碳和硅是对球铁的机械性能和铸造性能影响最大的两种元素。碳的含量高,析出的石墨球数就多、球径小、圆整度好;对球化剂的吸收率高,球化率也高;可以减少缩孔、疏松倾向及白口倾向;提高塑性和韧性。若含碳量太高,球化剂的残留量也应提高,才能保证球化。而残留镁量高 Our factory adopts cast high ductility ductile iron to make one tonne of front axle shell and other parts of dump truck. The process is simple, the performance is stable, the cost is reduced, the efficiency is improved, and the mechanical performance meets or exceeds the requirements of QT50-5. First, the casting of ductile iron ductile iron chemical composition of choice 1. Carbon, silicon content of carbon and silicon are determined on the ductile iron mechanical properties and casting properties of the two most influential elements. Carbon content is high, the number of graphite balls precipitated more, small diameter, good roundness; nodulizer absorption rate, ball rate is also high; can reduce shrinkage, loose tendency and white tendency; improve Plasticity and toughness. If the carbon content is too high, the amount of nodulizer should also be increased in order to ensure the ball. The residual magnesium content is high