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Products Standard

Steel Tube Process - Threading

Tube threading must have a certain thread form, dimension precision and roughness, so that it can realize tight junction after adopting high-class thread compound and tightened by the fasten machine. Pipe threading should be in right-handed rotation and be in accordance with API Spec 5B dimension and tolerance requirements. There are tube threading and non-threading for tube. The former one adopts joint connection while the latter one uses butt welding method to connect with the toll joint. Pipe threading is widely used to convey water, gas, oil and other fluids.

Production Line LST tube threading production line is configured with two advanced QK1319-G CNC casing threading lathes and three sets of Q1334H CNC tubing threading lathes. They are featured with high precision and high stiffness. This pipe threading production line is also equipped with three advanced domestic hydrostatic pressure equipment. They are with the test specification of φ60 mm to 406 mm and with the maximum test pressure reaching 120 MPa. There are also two sets of pipe end magnetic particle inspection machines for tube threading. They can test crack defects on the inside and outside surface that are 500 mm far away from the pipe end. We process 180,000 tons of casings and 70,000 tons of tubings every year.

Technological Process of Pipe Threading Feeding-Threading (Female Thread End)-Thread Inspection-Upper Coupling (Pre-twisting Machine)-Screw-on Machine-Drift Diameter-Tube Threading (Male Thread End)-Thread Inspection-Install Outer Protection Ring- Install Inner Protection Ring-Length Measuring and Weighing-Spray Mark-Spray Paint-Brush Paint on Coupling Stock-Brush Color Ring-Collection-Packaging.