The crack sensitivity of hypo-peritectic steel, its formation mechanism and factors are discussed, and on the analysis, the reasons and factors on longitudinal surface crack are found out.

• 为改善亚包晶钢高速浇铸时的表面质量,从过热度、锰硫比、拉速、铜板温度、平均热流和保护渣几个方面进行讨论。