按照冷拔无缝钢管生产方法的不同.无缝钢管可以分为热轧管、冷轧管、冷拔管、挤压管等。冷拔无缝钢管一般在自动轧管机组上出产。实心管坯经检查并清除表面缺陷，截成所需长度，在管坯穿孔端端面上定心，然后送往加热炉加热，在穿孔机上穿孔。在穿孔同时不断旋转和前进，在轧辊和顶头的作用下，管坯内部逐渐形成空腔，称毛管。再送至自动轧管机上继承轧制。经均整机均整壁厚，经定径机定径，达到规格要求。利用连续式轧管机组出产热轧无缝钢管是比较好的方法。

According to the different production methods of cold-drawn seamless steel pipes, seamless steel pipes can be divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes, extruded pipes and so on. Cold-drawn seamless steel tubes are usually produced on automatic pipe rolling mills. The solid billet is checked and cleared of surface defects, cut into the required length, centered on the end face of the billet perforation, then sent to the heating furnace for heating, and perforated on the perforator. Under the action of the roll and the top, a cavity is gradually formed inside the billet, which is called capillary. It is then sent to the automatic pipe mill to inherit the rolling. The wall thickness of the whole machine is uniform, and the sizing machine is uniform, which meets the requirements of specifications. It is a better method to produce hot-rolled seamless steel pipe by continuous pipe rolling mill.

若欲获得尺寸小和质量好的无缝钢管，要采用冷轧、冷拔或者两者联合的方法。冷轧通常在二辊式轧机长进行，钢管在变断面圆孔槽和不动的锥形顶头所组成的环形孔型中轧制。冷拔通常在0.5～100T的单链式或双链式冷拔机长进行。

In order to obtain seamless steel tubes of small size and good quality, cold rolling, cold drawing or combination of the two methods should be adopted. Cold rolling usually takes place at the head of a two-roll mill. Steel tubes are rolled in a circular pass consisting of a variable cross-section circular groove and a fixed conical head.  Cold drawing is usually carried out by a single chain or double chain cold drawing machine captain of 0.5-100T.

挤压法即将加热好的管坯放在密闭的挤压圆筒内，穿孔棒与挤压杆一起运动，使挤压件从较小的模孔中挤出。此法可出产直径较小的钢管。

In extrusion method, the heated tube blank is placed in a closed extrusion cylinder, and the perforating rod moves with the extrusion rod to extrude the extruded part from a smaller die hole. This method can produce steel pipes with smaller diameter.