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随着工业技术的不断发展,对灰铸铁的使用性能和工艺性能要求愈来愈高。我厂自1984年以来采取调整硅碳比值和严格炉前孕育处理,对提高灰铸铁的强度、改善铸造性能和切削加工性能,收到一定效果。一、调整硅碳比值多年来,我厂用HT20-40材质生产牛头刨床零件,其硅碳比值(Si/C)控制在0.5左右,生产中经常碰到“边白”、“白口”、“料硬”、缩松、缩孔、裂纹、导轨硬度不合格等
With the continuous development of industrial technology, the requirements for the performance and process performance of gray cast iron are getting higher and higher. I plant since 1984 to adjust the ratio of silicon and carbon and strict furnace precautionary treatment, to improve the strength of gray iron, improve casting performance and cutting performance, and received some results. First, to adjust the ratio of silicon to carbon Over the years, I plant with HT20-40 material production shaper parts, the silicon carbon ratio (Si / C) control at about 0.5, production often encounter “white side”, “white” “Material hard”, shrinkage, shrinkage, cracks, rail hardness unqualified