对双金属复合管衬层裂缝缺陷进行了宏观分析,对双金属复合管进行了基层和衬层理化分析、衬层壁厚分析及热挤压工艺分析。结果表明:该缺陷是不合理的热挤压工艺以及较大的衬层各截面壁厚差造成的。优化热挤压工艺后,双金属复合管成品率大大提高,有效保证了双金属复合管质量。 The bimetallic composite pipe lining crack defects were macroscopically analyzed. The bimetallic composite pipe was analyzed by physical and chemical analysis, lining wall thickness analysis and hot extrusion process. The results show that this defect is caused by the unreasonable hot extrusion process and the difference in wall thickness between sections of the larger lining. After optimization of the hot extrusion process, the yield of the bimetallic composite pipe is greatly improved, effectively ensuring the quality of the bimetallic composite pipe.