详细介绍了各种穿孔机、轧管机、定径机、微张力战径机、张力减径机的优缺点,并介绍了有关上述设备的技术参数,提出了无缝钢管轧机选型的建议. The advantages and disadvantages of various punching machines, pipe rolling machines, sizing machines, micro-tensioned warhead machines and tension reducing machines are introduced in detail. The technical parameters of the above equipment are introduced, and the suggestions for the selection of seamless steel pipe mills are put forward .