高炉铁液经变质处理后,原生铁中粗大片状石墨成为球状或蠕团状,从而使其抗拉强度由～10kg/mm~2提高至35～63kg/mm~2,用它制取铸件是一种节能的生产方式。但变质高炉铁液直接用于生产遇到的首要障碍是:由于生铁含碳量高(1.0～1.8%)所以起的石墨漂浮缺陷。本文从分析铸铁凝固特点出发对高碳铸铁件中石墨漂浮的形成机理提出了新的看法,并通过工艺试验提出了一些防止措施。 After the blast furnace molten iron metamorphic treatment, the coarse flake graphite in the primary iron becomes spherical or vermiform, so that its tensile strength is increased from ~ 10kg / mm ~ 2 to 35 ~ 63kg / mm ~ 2, Is a way of saving energy. However, the first major obstacle encountered in the production of metamorphic blast furnace molten iron is that it has graphite floating defects due to the high carbon content of pig iron (1.0-1.8%). Based on the analysis of the characteristics of cast iron solidification, this paper puts forward a new view on the formation mechanism of graphite floating in high-carbon cast iron parts and puts forward some preventive measures through the process test.