The longitudinal cracking is promoted by uneven heat flux, the average heat flux and temperature of copper pates are important factors for cracking.

• 结晶器壁热流不均是纵裂纹产生的有利环境，铸坯表面产生裂纹和没有裂纹时，二者的平均热流和铜板温度存在明显的差异。