减少连铸异型坯表面纵裂纹的工艺研究
吴坚
马钢第三钢轧总厂
Technique Study pf Reducing Longitudinal Surface Crack of Beam Blank
James Wu
摘要 研究了马钢连铸异型坯表面纵裂纹的成因和对应措施。由于异型坯形状的特殊性，结晶器传热存在严重的不均匀性，连铸坯表面温度差异很大，热应力导致纵裂纹。从改善结晶器传热，改进保护渣性能，稳定的浇注条件等方面开展工作。改进措施实施后，裂纹废品率下降80%。
Abstract ：Studied the reason and the countermeasure of longitudinal surface crack of Ma-Steel beam blank. Because of the special shape, there were strong non-uniformity of heat transfer in the mould. there were strong variations in surface temperature of beam blank. So that, Thermal stress induce the crack. Heat transfer in the mould and the performance of casting powder were improved. the stabilization of casting conditions were enhanced. Finally, the ratio of crack defect have been decreased 80%.
收稿日期: 2008-08-19
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2009, Vol. 44 
