what is hot finished seamless tube

Hot finished seamless tube also be caled hot rolled seamless steel pipe,Hot-rolled seamless steel tubes are rolled at a temperature above the recrystallization temperature. Hot rolling is rolling performed above the recrystallization temperature.

Hot finished seamless tube delivery status
Generally, the hot-rolled state is delivered after heat treatment. Hot-rolled seamless steel pipes are subject to strict manual selection by the staff after quality inspection. After the quality inspection, the surface is oiled, followed by multiple cold-drawing experiments. After the hot-rolling treatment, a perforation experiment is performed. If the diameter of the perforation is too large, straightening correction is required. After straightening, it is transferred to the flaw detector by the conveying device for flaw detection experiments. Finally, the labels are labeled and the specifications are arranged and placed in the warehouse.

Production process of hot finished seamless pipe
Round pipe billet → heating → perforation → three-roll diagonal rolling, continuous rolling or extrusion → stripping → sizing (or reduction) → cooling → straightening → hydraulic test (or flaw detection) → marking → storage seamless steel pipe It is made of steel ingots or solid tube blanks through perforation to make capillaries, and then made by hot rolling, cold rolling or cold drawing.
The specifications of seamless steel pipes are expressed in millimeters of outer diameter * wall thickness.

hot rolled seamless steel pipe size
The outer diameter of hot-rolled seamless pipe is generally greater than 32mm, the wall thickness is 2.5-200mm, the outer diameter of cold-rolled seamless steel pipe can reach 6mm, the wall thickness can reach 0.25mm, the outer diameter of thin-walled pipe can reach 5mm, and the wall thickness is less than 0.25mm. Rolling has higher dimensional accuracy than hot rolling.