Internal straight seams in the production process of drawn seamless tubes are a common defect that often occurs on automatic tube mills and are difficult to resolve (Emerson).Precision Drawn Seamless TubeA steel pipe with a hollow cross-section and seamless edges, it is produced by piercing ingots or solid billets into rough pipes, followed by hot rolling, cold rolling, or cold drawing. Precision drawn seamless steel pipes, with their hollow cross-section, are extensively used as fluid conveyance pipelines, such as those for transporting oil, natural gas, coal gas, water, and certain solid materials. From 2006 to 2008, the import of precision drawn seamless steel pipes from China to the United States increased by 131.52%, with the value reaching approximately $382 million. In most cases, the straightness is minor and does not render the pipes waste; however, it can be more severe, posing significant hazards during the production of aircraft tubes and alloy precision drawn seamless pipes, necessitating attention. Precision drawn seamless steel pipes are widely used as pipelines for conveying fluids, such as oil, natural gas, coal gas, water, and certain solid materials. From 2006 to 2008, the import of precision drawn seamless steel pipes from China to the United States increased by 131.52%, with the value reaching approximately $382 million. The cause of internal straightness defects in precision drawn seamless steel pipes is the presence of convex and concave defects on the surface of the rolling mandrel, such as fused iron oxide (Fe2O3) skin welded to the mandrel, as well as mandrel wear (a basic type of component failure) and shape distortion, which scratch the inner surface of the pipes. Due to the characteristics of longitudinal rolling, the scratches are linear, hence the term "internal straightness." Internal straightness primarily occurs in the thinning zone, with depths generally around 0.2 millimeters.