production,methods,Small,diame technology production methods of Small diameter seamless steel tube
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According to the different production methods can be divided into hot rolling pipe, cold rolled, cold drawn tubes, extruded tube, etc., hot-rolled seamless pipe in automatic rolling on production unit. Solid billet through inspection and clear surface defects cut into the required length, centering on the tube billet perforation end face And then sent to the furnace heating Punch in the punch In perforated revolve and progress at the same time, under the action of roll and head, tube billet internal gradually formed cavity capillary, then sent to plug mill continue rolling finally after all the machine all the whole wall thickness, the sizing machine sizing (reducing), meet the specification requirements, the use of continuous rolling pipe unit production of hot-rolled seamless steel tube is more advanced methods, if you would like to get a smaller size and better quality seamless tube, must adopt the method of cold rolling cold drawn or both combined cold rolling is usually conducted on two-high rolling mill, steel pipe in variable cross section round hole groove and fixed cone in the head of the ring groove rolling, cold drawing usually on a single or double chain chain cold drawing machine extrusion method is heated tube billet in airtight extrusion cylinder hole rods and extrusion, extrusion from smaller extrusion die, this method can produce smaller diameter of steel pipe.