我们在气割球墨铸铁浇冒口时发现,虽然这种铸铁常用镁做球化剂进行变质处理,清除了片状石墨对基体的割裂作用,使其机械性能能与碳钢相媲美,但它的气割条件却远不如碳钢,常使气割工人感到棘手。其原因主要是: 1.球墨铸铁中含有较多的硅,硅与氧气流燃烧反应产生二氧化硅,其熔点高于铸铁的熔点。这些二氧化硅附在金属表面不易被氧气流吹开,使气割工作不能正常进行。 We gas cutting ductile iron pouring found that although this cast iron magnesium commonly used as a nodulizer for metamorphic treatment, clear the sheet of graphite on the substrate of the role of fragmentation, so that its mechanical properties comparable with the carbon steel, but its Gas cutting conditions are far less than carbon steel, gas cutter often feel thorny. The main reasons are: 1. Ductile iron contains more silicon, silicon and oxygen flow combustion reaction produces silicon dioxide, the melting point higher than the melting point of cast iron. These silica attached to the metal surface is not easy to be blown by the oxygen flow, the gas cutting work can not be normal.