我厂在稀土镁球墨铸铁投产初期,球铁质量不稳定,经常产生球化不良、球化衰退、皮下气孔、石墨飘浮等铸造缺陷,废品率较高,有时高达50～60%,甚至整炉报废。针对这种情况,在厂党委的领导下,组成了以工人为主体的三结合试验小组,猛攻球铁质量关,对球铁件上述缺陷的形成原因和 I plant in the initial production of rare earth magnesium ductile iron, ductile iron quality is unstable, often produce bad ball, ball decline, subcutaneous stomatal, graphite floating defects such as casting defects, high rejection rate, sometimes as high as 50 to 60%, and even the whole furnace scrapped. In response to this situation, under the leadership of the factory party committee, composed of the workers as the mainstay of the three combined test group, fierce attack on the quality of ductile iron, ductile iron pieces of the above-mentioned reasons for the formation of defects and