Hot rolling (extruded structural tube): round tube blank → heating → piercing → three-roll cross-rolling, continuous rolling or extrusion → stripping → sizing (or reducing diameter) → cooling → billet tube → straightening → hydraulic test (Or flaw detection) → mark → warehousing.
Hot-rolled structural tubes use continuous casting slabs or blooming slabs as raw materials, heated by a walking heating furnace, high-pressure water descaling, and then enter the rough rolling mill. The rough rolling material is cut head, tail, and then enters the finishing mill for computer control After rolling, after the final rolling, it is cooled by laminar flow and coiled by a coiler to become a straight hair coil. The head and tail of straight hair curlers are often tongue-shaped and fish-tail-shaped, with poor thickness and width accuracy, and the edges often have defects such as wave shape, hemming, and tower shape. The coil weight is heavier and the inner diameter of the steel coil is 760mm. (Generally used in the pipe making industry.) After the straight hair coil is processed by the head, tail, edge trim, multi-pass straightening, leveling and other finishing lines, then it is cut or recoiled to become: hot rolling Products such as steel plate, flat hot-rolled steel coil, slitting strip, etc. If the hot-rolled finished coil is pickled to remove the oxide scale and coated with oil, it becomes a hot-rolled pickled coil. This product has a tendency to partially replace cold-rolled structural pipes, and the price is moderate, and it is very popular among users.
