按照冷拔無縫鋼管生產方法的不同.無縫鋼管可以分為熱軋管、冷軋管、冷拔管、擠壓管等。冷拔無縫鋼管一般在自動軋管機組上出產。實心管坯經檢查并清除表面缺陷，截成所需長度，在管坯穿孔端端面上定心，然后送往加熱爐加熱，在穿孔機上穿孔。在穿孔同時不斷旋轉和前進，在軋輥和頂頭的作用下，管坯內部逐漸形成空腔，稱毛管。再送至自動軋管機上繼承軋制。經均整機均整壁厚，經定徑機定徑，達到規格要求。利用連續式軋管機組出產熱軋無縫鋼管是比較好的方法。

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.

若欲獲得尺寸小和質量好的無縫鋼管，要采用冷軋、冷拔或者兩者聯合的方法。冷軋通常在二輥式軋機長進行，鋼管在變斷面圓孔槽和不動的錐形頂頭所組成的環形孔型中軋制。冷拔通常在0.5～100T的單鏈式或雙鏈式冷拔機長進行。

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.

擠壓法即將加熱好的管坯放在密閉的擠壓圓筒內，穿孔棒與擠壓桿一起運動，使擠壓件從較小的?？字袛D出。此法可出產直徑較小的鋼管。

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.