Large diameter heavy wall pipe is a capillary tube made of round steel through perforation, and then made by hot rolling, cold rolling or cold drawing. It has an important position in China's steel pipe industry. Large diameter heavy wall pipe is divided into two types: hot-rolled and cold-rolled (dial) seamless steel pipes.

The raw material of the Large diameter heavy wall pipe is round tube blanks. The round tube blanks are cut by a cutting machine into a blank of about 1 meter in length, and then sent to the furnace for heating via a conveyor belt. The billet is fed into the furnace and heated at a temperature of approximately 1200 degrees Celsius. The fuel is hydrogen or acetylene. The temperature control in the furnace is a key issue. After the round tube is out of the furnace, it must be pierced through a pressure punching machine.
The manufacturer of Large diameter heavy wall pipe tells you that the most common piercing machine is the tapered roller piercing machine. This type of piercing machine has high production efficiency, good product quality, large perforation diameter expansion, and can wear a variety of steel types. After piercing, the round tube billet is successively cross-rolled, continuous rolled or extruded by three rolls. After squeezing, take off the tube and calibrate. The sizing machine uses a tapered drill bit to rotate at a high speed into the steel blank to punch holes to form a steel pipe. The inner diameter of the steel pipe is determined by the length of the outer diameter of the drill bit of the sizing machine. After the steel pipe is sized, it enters the cooling tower and is cooled by spraying water. After the steel pipe is cooled, it will be straightened. After straightening, the steel pipe is sent to the metal flaw detector (or hydraulic test) by the conveyor belt for internal flaw detection. If there are cracks, bubbles, etc. inside the steel pipe, it will be detected. The manufacturer of Large diameter heavy wall pipe tells you that steel pipes must be selected strictly by hand after quality inspection. After the quality inspection of the steel pipe, paint the serial number, specification, production batch number, etc. with paint. It is hoisted into the warehouse by a crane.
The above is the production process of Large diameter heavy wall pipe, I hope to help you.