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对材质为20钢的无缝管内折缺陷进行了扫描电镜以及金相显微镜检测分析,经检测分析,该折叠缺陷产生原因为钢坯内部疏松严重并有硫化物聚集,在穿管过程中暴露在管内壁,这种伴随有夹杂的组织缺陷在轧制过程中无法焊合从而形成内壁折叠缺陷。
The internal defects of the seamless tube made of 20 steel were examined by scanning electron microscopy (SEM) and metallographic microscope. The results showed that the internal defects of the billet were loose and had sulfide accumulation and were exposed in the tube Walls, such inclusions accompanied by inclusions in the rolling process can not be welded to form the inner wall folding defects.