合理地设计化学成分，适度地提高硅碳比，选用稀土镁硅铁与硅铁的混合孕育是稳定生产高牌号机床灰铸铁件的成功经验。该经验可操作性强，生产技术难度小，质量稳定，成本低廉。该经验对有关工厂有关产品有较大参考价值和显著经济效益。 Rational design of chemical composition, a modest increase in silicon-carbon ratio, the selection of rare earth ferrosilicon and ferrosilicon mixed inoculation is a stable production of high-grade machine gray iron castings of successful experience. The experience of maneuverability, production technology is difficult, stable quality and low cost. The experience of the factory-related products have greater reference value and significant economic benefits.