用扫描电镜、大型金相显微镜观察分析高碳钢盘条的缩径，结果表明：造成缩径的主要原因是盘条中的非金属夹杂物超标、方坯偏析和缩孔。
The results showed that the major cause of reducing diameter was more non-metallic inclusion in the steel than standard value, billet segregation and shrinkage void.
由于钢锭内部不可避免地存在偏析、疏松、缩孔及微裂纹等冶金缺陷。
Owing to both physical and chemical properties of metal material, there are inevitably shrinkage cavities, porosity and segregation in ingots.
进行了连铸工业试验，效果明显：铸坯中心缩孔和中心裂纹被消除，中心偏析和中间裂纹也得到降低。
When high frequency pulse current is applied to CC billet, the centerline pipe and centerline crack in the billet are eliminated, and the central segregation and central crack are reduced.
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