at high casting speed the negative strip time and the powder consumption were decreased making the oscillation mark bended, protruding, and even hook type.

• 高拉速下负滑脱时间偏小,保护渣耗量低,造成铸坯振痕弯曲、外凸、严重时出现钩形振痕现象的特点,对结晶器振动参数进行了优化。