Thick-walled seamless steel pipe production and production process

　Manufacturing process of thick-walled steel pipe thick-walled steel pipe seamless steel pipe: 
　　hot-rolled (extruded seamless steel pipe) round billet → heating → perforation → three-roll cross-rolling, continuous rolling or extrusion → pipe removal → sizing (or reducing diameter) ) Cooling → Straightening → Hydraulic test (or flaw detection) mark → storage. 
　　The raw material for rolling the seamless pipe is a round tube blank. It is sent to the furnace for heating via a conveyor belt. The billet is fed into a furnace and heated to a temperature of approximately 1200 °C. The fuel is hydrogen or acetylene. Furnace temperature control is a critical issue. After the round tube blank is released, it is perforated through a pressure punch. 
　　The more common perforating machine is a conical roller punching machine. This perforating machine has high production efficiency, good product quality, large diameter of perforation and can wear a variety of steel types. After perforation, the round billet is successively rolled, rolled or extruded by three rolls. After extrusion, the tube should be sizing. The sizing machine is rotated at a high speed by a conical drill bit into a steel core to form a steel pipe. The inner diameter of the steel pipe is determined by the outer diameter of the sizing machine drill bit . After the steel pipe has been sized, it enters the cooling tower and is cooled by water spray. After the steel pipe is cooled, it is straightened. After the steel pipe is straightened, it is sent to a metal flaw detector (or water pressure test) by a conveyor belt for internal flaw detection. If there are cracks inside the steel pipe, bubbles and other problems will be detected. After the quality inspection of the steel pipe, it must be carefully selected by hand. After the quality inspection of the steel pipe, the paint is sprayed with the number, specification, production batch number, etc. It is hoisted into the warehouse by a crane.