The hot rolling process refines the grain structure of the steel ingot, eliminates casting defects, and compacts the internal matrix, thereby enhancing the mechanical properties of the finished seamless steel tube. This improvement is directionally dependent, meaning the material loses full isotropy to a certain extent along the rolling axis. Meanwhile, any porosity, micro-cracks, or blowholes originating from solidification are effectively closed and welded under elevated temperature and compressive force. The subsequent production route for the seamless steel tube follows this sequence: billet preparation → surface inspection → skin peeling → re-inspection → reheating → rotary piercing → acid washing → defect grinding → lubrication and moisture elimination → end welding → cold drawing → solid solution treatment → acid immersion → passivation treatment → quality check → cold reducing → oil removal → end cropping → hot air drying → internal bore polishing.