Hunan Steel Industrial Zone, No.9 Xiangfu Road, Yuhua District, Changsha, China
Production process: round tube perforation → heating → three-roll rolling, rolling or extrusion → detached → sizing (or reducing) → cooling → straightening → hydrostatic test (or testing) → mark → storage
According to the different production methods, the seamless steel pipe can be divided into hot-rolled pipes, cold-rolled, cold drawn tubes, squeeze tubes, hot-rolled seamless pipe, it is generally automatic pipe mill production and solid tube inspection and removal of surface defects are cut into required length. End to end in the perforated tube surface-centering and then sent to the furnace heating, punch in the punch, while continuing to rotate and advance the perforation under the action of the roll and the head. The tube gradually formed within the cavity, it said capillary and then sent Auto continue rolling the pipe rolling mill and finally by the machine are both whole wall thickness, the sizing mill sizing, to specifications. Continuous to use of hot-rolled seamless pipe mill production is more advanced methods. The smaller size and better quality seamless must be cold-drawn or cold rolled combination of the two is usually carried out on a two-roll mill, steel pipe in the hole becomes a sectional groove and the cone does not move ring-shaped plug hole formed in rolling, drawing generally single chain or double chain drawing machine for tube extrusion method is about to be placed in closed heating good extrusion cylinder perforated rod and extruded move with the rod, so that the smaller extrusion extruded from the die hole, this method can produce smaller diameter steel pipe.