不锈钢毛细管在加工全过程中很有可能会出現边框线裂痕、结痂、参杂及其结痂等表层缺点，这种缺点大概是因为铸坯外弧皮下组织角出現了横裂，连铸结晶器中有细微的残渣渗入，铸轧时沒有清除整洁不锈钢毛细管表层的空气氧化渣，及其在冷轧解决中因为铸坯菱角向不锈钢毛细管表层翻车所导致的。这种缺点不仅减少了不锈钢毛细管的工艺性能，针对产品品质的提高也造成了影响，因此 搞好防止和妥善处理不锈钢毛细管表层缺点是十分关键的。

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