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低碳高錳鋼大方坯表面裂紋原因分析

Analysis of the surface crack on casting bloom of low carbon and high manganese steel

  • 摘要: 通過電爐→LF→VD流程冶煉的低碳高錳鋼澆注成300mm×360mm大方坯后,在鑄坯表面發現裂紋.利用光學顯微鏡、掃描電鏡及能譜分析儀對鑄坯表面裂紋進行分析,發現裂紋的產生與鋼的化學成分、鋼中夾雜物、鋼水溫度、保護渣和析出物等因素有關.在實際生產中可以從鋼水窄成分控制,提高鋼水潔凈度,合理控制鋼水溫度,采用結晶器專用保護渣等方面來提高連鑄坯表面質量.

     

    Abstract: The surface cracks on the 300 mm×360 mm continuous casting bloom of low carbon and high manganese steel made by electric-arc furnace(EAF),ladle furnace(LF),and vacuum decarburization(VD) processes were found after cooling. The formation of surface crack was investigated by optical microscopy,scanning electron microscope(SEM) and energy dispersive spectrometer(EDS). The results indicated that surface crack was related to the chemical composition of the steel,the inclusions,the temperature of the steel,the mold fluxes,and the precipitates. Controlling the chemical composition of the steel,decreasing the amount of inclusions,controlling the temperature of the steel reasonably,and using special mold flux can promote the surface quality of the casting bloom in some degree.

     

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