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由西德施罗曼-西马克公司为生产棒材而开发的一种大压下量轧机——三辊行星轧机(PSW),经过连续的开发和三年的试验以后,已用于生产无缝钢管。目前有两台三辊行星轧机投入了生产,一台在德意志联邦共和国,一台在美国。 采用三辊行星轧机轧制无缝钢管的车间主要由加热炉、穿孔机、三辊行星轧机、定径或张力减径机组成。圆管还由料场或直接由连铸机周期地送入加热炉。圆管坏经加热以后,再周期地从炉内送出,进入穿孔机轧成空心管坯,且将其套在出口芯棒上。
A three-roll planetary mill (PSW), developed by West German Schroedermann and SMS Siemag for the production of bars, has been used in the production of seamless after continuous development and three years of testing Steel Pipe. There are currently two three-roll planetary mills in production, one in the Federal Republic of Germany and one in the United States. The mill with the three-roller planet rolling mill seamless steel pipe is mainly composed of a heating furnace, a piercing mill, a three-roller planet rolling mill, a sizing or stretch reducing mill. The pipe is also periodically fed into the furnace by the stockyard or directly from the caster. After the tube is badly heated, it is periodically sent out of the furnace, rolled into a hollow tube by a piercer, and placed over the exit mandrel.