要获得无缩孔无缩松的球墨铸铁件,必须选择合适的化学成份、铸型工艺、球化剂的种类以及处理工艺,其中关系最大的还是化学成份和铸型工艺。也就是说所选择的化学成份和铸型工艺必须有利于石墨膨胀和有足够的铁水能通过一定的通道来弥补铸型位移以及液态收缩后余下的空间,才能获得组织致密的铸件。 To obtain non-shrinkage non-shrinking ductile iron castings, we must select the appropriate chemical composition, casting process, the type of nodulizer and treatment process, of which the relationship between the chemical composition and the most important casting process. In other words, the selected chemical composition and the mold process must be conducive to graphite expansion and sufficient hot metal through a certain channel to make up for the mold displacement and the remaining space after liquid contraction in order to obtain dense tissue castings.