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无缝钢管生产中,自动轧管机、连续式轧管机、周期轧机、顶管机和三辊轧管机等一般可生产φ60～660mm的无缝钢管,但这些轧机用于生产更大或更小直径的无缝钢管就很不经济。更小直径的无缝钢管多以热轧无缝管作坯料,再经冷轧、冷拔加工获得;更大直径的无缝钢管,例如有些低压输送管道,一般都使用成本较低的焊管。但是大直径焊管性能满足不了石油、天燃气输送管道及工程结构用大直径管的要求,因此这种大直径无缝钢管便采用大型轧机
Seamless steel pipe production, automatic pipe mill, continuous pipe mill, periodic mill, pipe jacking machine and three-roll mill and other general φ60 ~ 660mm seamless steel pipe production, but these mills for the production of larger or Smaller diameter seamless pipe is very uneconomical. Smaller diameter seamless steel pipe is mostly made of hot rolled seamless pipe, which is obtained by cold rolling and cold drawing. Larger diameter seamless pipe, such as some low pressure conveying pipe, generally use lower cost welded pipe. However, the performance of large-diameter welded pipe can not meet the oil and gas pipelines and engineering structures with large-diameter pipe requirements, so the use of large-diameter seamless steel pipe rolling mill