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球墨铸铁的强度从350~400℃开始下降,为了提高它的强度,有必要用钼进行合金化。钼可以有效地提高球铁的淬透性,在这方面它超过了铜、镍、锰。铸铁中钼含量超过1%时,铸件获得难以加工的贝氏体组织,同时,钼含量大于0．8%会使球铁的抗氧化性变坏。但是,在被研究的铸铁中一般含有小于1%的镍。对于工作温度高于400℃的热机零件适当的钼含量和化学成分如表1所列。
The strength of ductile iron begins to decline from 350 to 400 ° C, and in order to increase its strength, it is necessary to alloy with molybdenum. Molybdenum can effectively improve the ductility of ductile iron, in which it exceeds copper, nickel and manganese. Cast iron in the molybdenum content of more than 1%, the casting bainitic hard to obtain the organization, at the same time, the molybdenum content of more than 0.8% of ductile iron oxidation resistance will deteriorate. However, less than 1% nickel is typically contained in the cast iron under study. Appropriate molybdenum content and chemical composition for heat engine parts above 400 ° C are listed in Table 1.