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高炉铁水含碳量高,属于过共晶铁水。饱和铁水中的碳通过扩散作用在铁水的自由表面上生成石墨。翻包浇铸由于铁水自由表面随浇铸过程不断变化,另外包嘴到铸件浇口处的液流很长,比底漏包高3~5倍,自由表面和液流直接与大气接触机会增加,因此,极易生成石墨夹渣缺陷。石墨夹渣是高炉铁水钢铁模的主要缺陷之一。而底漏包浇铸铁水上表面随浇铸过程平稳下降,并被厚厚一层渣子所覆盖,不与大气直接接触,铁水从包底部缓缓流出,且液流较短。因此不易生成石墨夹渣缺陷,从
High-carbon steel blast furnace hot metal, are hypereutectic hot metal. Carbon in saturated hot metal generates graphite on the free surface of molten iron by diffusion. Turn-casting Because the free surface of molten iron changes with the casting process, the other pouring nozzle to the casting liquid flow is very long, 3 to 5 times higher than the bottom leakage package, the free surface and the flow of direct contact with the atmosphere increases, so , Easy to generate graphite slag defects. Graphite slag is one of the main defects of blast furnace hot metal. However, the top surface of the bottom pouring ladle cast iron water drops steadily with the casting process and is covered by a thick layer of slag without direct contact with the atmosphere. The molten iron slowly flows out from the bottom of the bag and the liquid flow is short. So difficult to generate graphite slag defects, from