The seamless carbon steel pipe is created by perforating a steel ingot or a solid tube blank, and then hot rolled, cold rolled or cold drew. Seamless carbon steel pipe plays an important role in the steel pipe industry.
According to incomplete statistics, there are more than 240 seamless carbon steel pipe production enterprises in China, and there are more than 250 seamless carbon steel pipe units with an annual production capacity of more than 4.5 million tons.
The raw material of the seamless carbon steel pipe is a round tube blank, which is cut into a blank having a length of about 1 m by a cutting machine, and sent to a furnace for heating through a conveyor belt. The billet is fed into a furnace and heated to a temperature of approximately 1200 degrees celsius.
The fuel is hydrogen or acetylene. Furnace temperature control is a critical issue. After the round tube blank is released, it is subjected to a through-hole punching machine. The more common perforating machine is a conical roller punching machine. This perforating machine has high production efficiency, good product quality, a large diameter of perforation, and can wear a variety of steel types.
After perforation, the round billet is successively rolled or extruded by three rolls. After extrusion, the tube should be sized. 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.