钢管定径与减径是热轧无缝钢管的主要工序之一。为保证成品尺寸公差,钢管必须进行定径。 我国60年代设计、70年代安装投产的φ100自动轧管机组中,都是五机架的定径机。从这几年的使用情况看,感到五机架定径能力不够。由于五机架定径,减径量太少,仅起控制尺寸公差的作用。因而不同外径的钢管,几乎都要用相应规格的坯料来生产。坯料的规格多,给提高产量,降低成 Steel sizing and reducing the diameter of the hot-rolled seamless steel pipe is one of the main processes. In order to ensure the dimensional tolerance of the finished product, the steel pipe must be calibrated. China’s 60’s design, 70’s put into operation in φ100 automatic pipe rolling unit, are five-rack sizing machine. Judging from the use of these years, five-frame sizing is not enough. As the five-rack diameter, reducing the amount is too small, only control the size of the role of tolerance. Therefore, different diameter steel pipe, almost all with the corresponding specifications of the blank to produce. Billets and more specifications to improve production and reduce into