Hot-rolled seamless pipe mill in general on automatically produced. Solid tube inspection and removal of surface defects, cut into desired length, end to end in the perforated tube surface-centering, and then sent to the furnace heating, punch a hole. In the hole while continuing to rotate and move forward in the roll and the role of the head, gradually formed within the tube cavity, called the capillary. And then sent to the automatic rolling machine rolling inheritance. Finally after all the whole entire wall thickness are, after sizing mill sizing, to specifications. Use of continuous production of hot-rolled seamless steel pipe mill is older than the raise method.
If you wish to get smaller and better quality seamless steel tube, must be cold-rolled, drawn or a combination of methods. Usually in the two-roll cold rolling mill for long, pipe hole in the variable section tapered slot and does not move the head of the circular hole formed in the rolling. Drawing is usually 0.5 ~ 100T single chain or double chain drawing captain proceed.
Heating tube extrusion method is about good squeeze on the closed cylinder, perforated extruded rod rod and move together, so that extrusion from the smaller hole in the extrusion die. This method can produce a smaller diameter pipe.
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