How are seamless steel pipes produced?
2014-11-21
According to different production methods, it can be divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes, extruded pipes, etc. 1.1 Hot-rolled seamless pipes are generally produced on automatic pipe rolling units. The solid pipe blank is inspected and surface defects are removed, cut to the required length, centered on the end face of the pipe blank at the perforation end, and then sent to the heating furnace for heating before being perforated on the perforating machine. During perforation, it continuously rotates and advances; under the action of rollers and a mandrel, a cavity gradually forms inside the pipe blank, called a mother tube. It is then sent to an automatic pipe rolling machine for further rolling. Finally, it is equalized in wall thickness by an equalizing machine and sized by a sizing machine to meet specification requirements. Using continuous pipe rolling units to produce hot-rolled seamless steel pipes is a more advanced method.
1.2 If smaller dimensions and better quality seamless pipes are desired, cold rolling or cold drawing or a combination of both methods must be used. Cold rolling is usually carried out on two-roll mills where steel pipes are rolled in an annular hole formed by variable cross-section round hole grooves and stationary conical mandrels. Cold drawing typically occurs on single-chain or double-chain cold drawing machines with capacities ranging from 0.5 to 100 tons.
1.3 The extrusion method involves placing heated pipe blanks inside a closed extrusion cylinder where a piercing rod moves together with an extrusion rod to extrude the material through smaller die holes. This method can produce steel pipes with smaller diameters.
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Shenyang Tengfei Iron Corporation
Shenyang Tengfei Steel Pipe Co., Ltd.
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