Tube embryo to be cut by cutting machine length of about 1 meters of billet, the diameter of the pipe and wall thickness of less than 20 steel pipe called thick-walled steel pipe.
Thick-walled steel pipe is mainly used as petroleum geology drilling pipe, petrochemical cracking pipe, boiler pipe, bearing tube, as well as automobile, tractor, aviation high-precision structure pipe.
Manufacturing process of thick-walled steel pipe with thick wall steel tube:
Hot-rolled (extruded seamless steel tube) round tube billet → heating → perforation → three-roll skew rolling, continuous rolling or extrusion → removing pipe → sizing (or reducing) cooling → straightening → hydrostatic test (or flaw detection) Mark → warehousing. The raw material for rolling seamless pipe is round tube billet. and the conveyor belt is sent to the furnace for heating. The billet is heated in a furnace and is about 1200 ℃ in temperature. The fuel is hydrogen or acetylene. Temperature control in furnace is a key problem.
When the Tube billet is released, it will be perforated by pressure piercing. Generally more common punch is the cone-shaped roller piercing machine, this type of piercing machine production efficiency, product quality, perforation expansion is large, can wear a variety of steel. After perforation, the round tube billet has been three-roll skew rolling, continuous rolling or extrusion. After extrusion to remove the tube sizing. The sizing machine rotates into the steel embryo punch through the conical bit at high speed, forming the steel pipe. The inner diameter of the pipe is determined by the diameter of the drill bit. After the steel tube is fixed, it enters the cooling tower and cools through the water spray, and the steel tube is straightened after cooling. After straightening, the steel tube is sent to the crack detection machine (or hydrostatic test) for internal flaw detection. If there are cracks inside the steel pipe, bubbles and other problems, will be detected. Steel pipe After quality inspection also through strict manual selection. After quality inspection, the paint is sprayed with the number, specifications, production batches and so on. And the crane is hoisted into the warehouse.