无缝钢管生产工艺由下列主要工序组成:圆钢切割成定尺长度的管坯,管坯的加热,管坯的定心,管坯在斜轧穿孔机上穿轧成厚壁荒管和将其辗轧成钢管。荒管和钢管前端壁厚不均的主要原因是,当芯棒插入管坯端部的瞬间,芯棒的中心线同管坯的中心线不吻合造成的。大多数研究者认为, Seamless steel pipe production process consists of the following main processes: Round steel cut into a length of the tube blank, the tube heating, tube centering, the tube piercing piercing mill piercing into thick wall and its Rolled into steel pipe. The main reason for the uneven wall thickness at the front end of the waste pipe and the steel pipe is that when the mandrel is inserted into the end of the pipe blank, the center line of the mandrel does not coincide with the center line of the pipe blank. Most researchers think,