The mechanism by which the cracks were produced was elucidated, and the relation of the formation of the cracks with residual aluminum present in the steel determined.

• 借助磁力探伤与显微观察等方法；对发纹的形貌和氧化物进行分析.；找出钢坯表面发纹形成的原因；揭示钢坯表面发纹生成与钢中残铝量的关系;