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我厂铸造球墨铸铁件,四年多以来夹渣问题一直没有得到很好的解决。过去大家一致认为。造成夹渣的主要原因是铁水中含硫量高(原铁水含硫量0.1％左右),因而产生了一些硫化物,造成夹渣,到后来将原有酸性冲天爐改为碱性冲天爐,虽然原铁水含硫量已降低到0.5％以下,但铸件夹渣问题仍然存在。一般夹渣现象都发生在铸件上表面层2～5公厘厚的地方,唯一的解决办法只有把加工量加大,如曲轴加工量达到7～10公厘。但在不加工的地方仍无法挽救。经过和科学研究部门研究,从苏联资料中得到:在处理好的铁水中,加入冰
I plant casting ductile iron pieces, slag problems over the past four years has not been well resolved. In the past everyone agreed. The main cause of slag inclusions is the high sulfur content in molten iron (the original molten iron has a sulfur content of about 0.1%), resulting in some sulfides, resulting in slag inclusions. Later, the original acidic cupola was changed to an alkaline cupola, Although the original molten iron sulfur content has been reduced to below 0.5%, but the casting slag problem still exists. Common slag inclusions occur in the casting surface layer 2 to 5 cm thick, the only solution to increase the processing volume, such as crankshaft processing capacity reached 7 to 10 mm. But still can not be salvaged in the unprocessed place. After research and scientific research department, obtained from the Soviet Union data: in dealing with the hot metal, add ice