What’s the procedure of seamless carbon steel pipe?

The seamless carbon steel pipe is formed by perforating a steel ingot or a solid tube blank, and then hot rolled, cold rolled or cold drawn. Seamless carbon steel pipe plays an important role in steel pipe industry.

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. 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.

ASTM A106 Gr B seamless steel pipes

ASTM A106 Gr B seamless steel pipes

This perforating machine has high production efficiency, good product quality, and 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, a conveyor belt for internal flaw detection sends it to a metal flaw detector (or water pressure test). 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.

Haihao Group manufacture & supply seamless steel pipes in different materials,standards and dimensions.If you want to know more about our piping products,please email to us:sales@haihaogroup.com