球化处理后w(C)量降低原因分析

Analysis of Reason Causing Carbon Content Decrease after Nodularizing Treatment

采用冲入法在500 kg的堤坝包中进行球化处理,用RESiFeMg合金作球化剂,球化反应时间>40 s;用SiBa合金作孕育剂,在180 kg的浇包内进行孕育处理;用直读光谱仪分析球化处理前后铁液的激冷试样。发现:(1)球化处理后w(C)量比原铁液的w(C)量低;(2)石墨漂浮是导致球化处理后w(C)量降低的主要原因。

The nodularizing treatment was conducted by adopting pour-over process in a ladle with dam-formed pit and by using RESiFeMg alloy as nodularizing alloy.The alloy reaction duration was more than 40 s.The inoculation was conducted in a 180 kg pouring ladle with SiBa alloy as the inoculant.The carbon contents before and after nodualrizing treatment was analyzed with spectro-analyzer by using chilled-specimens cast in the cast iron mould.Investigation revealed：（1） the carbon content after nodularizing was lower than that before nodularizing;（2） graphite floatation was the main reason causing carbon content decrease.