搞清楚主要强化因素和合金元素的作用,就能比较容易地生产出优质高强度灰铸铁。不同的合金元素具有不同的优缺点,当要以最低的成本生产出优质铸件时,必须考虑到这些优缺点。许多工厂发现,在保持机械加工性能的同时,生产具有28～42kg/mm~2抗拉强度的试棒是比较容易 To figure out the main strengthening factors and the role of alloying elements, we can relatively easily produce high-quality, high-strength gray cast iron. Different alloying elements have different advantages and disadvantages. These advantages and disadvantages must be taken into account when producing high quality castings at the lowest cost. Many found that it is easier to produce test bars with a tensile strength of 28-42 kg / mm2 while maintaining machinability