大挤压比管坯热挤压内表面缺陷分析及工艺改进

Analysis on internal surface defects and technological improvement of hot extruded tube blanks with large extrusion ratio

挤压管管坯生产时内部易出现表面凹坑、白点、横向拉伸裂纹等缺陷。本文对管坯内表面缺陷管坯试样进行了分析,提出了管坯内表面缺陷的工艺改进和预防措施。

The surface hollow,white points and horizontal tensile crack often appear in the internal tube blank. The paper analyses the internal surface defects of tube blanks and puts forward related process improving measures and preventive measures.