According to different production methods, Seamless pipe can be divided into hot-rolled pipe, cold-rolled pipe, cold drawn pipe, extruded pipe, etc.
1.1 the hot-rolled seamless pipe is generally produced on the automatic tube rolling unit. After the solid tube blank is inspected and the surface defects are removed, it is cut to the required length, centered on the end face of the piercing end of the tube blank, then sent to the heating furnace for heating, and perforated on the piercing machine. Under the action of the roller and the plug, a cavity is formed in the blank, which is called the blank. Then send it to the automatic tube rolling machine to continue rolling. Finally, the wall thickness of the whole machine is equalized and the diameter is calibrated by the sizing machine to meet the specification requirements. It is an advanced method to produce hot-rolled DIN2488 Sch160 Carbon Steel Seamless Pipe by continuous rolling mill.
1.2. In order to obtain the seamless pipe with smaller size and better quality, cold rolling, cold drawing or the combination of the two methods must be used. Cold rolling is usually carried out on a two high mill, and steel pipes are rolled in a circular pass composed of a variable cross-section circular groove and a fixed conical head. Cold drawing is usually carried out on single chain or double chain cold drawing machines of 0.5-100t.
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