Abstract: Briefed in the paper are the features of design and manufacture of the Ф180 mm TCM 3-roll retained-mandrel pipe mill, and its manufacturing process.Also detailed are the structural characteristics, performance parameters and control system application, etc.of the main units of the mandrel mill line, i.e., the cone type piercer with guide shoes, the 5-stand retained-mandrel mill proper, the 3-stand extracting mill and the 24-stand stretch reducing mill.Moreover, a discussion is presented, involving the features of design, manufacture, installation and commissioning, and accuracy requirement of the equipment of the mill plant.