Seamless pipe manufacturing process

Seamless pipe is the strongest of all pipe types because it has a uniform structure over the entire length of the pipe.

► Seamless pipe is manufactured in the same size and schedule. However, the manufacture of large diameter pipe is limited. Seamless pipe is widely used in the manufacture of pipe fittings such as elbows, bends, and tees.

►A detailed explanation of the various manufacturing processes.

 

Mandrel mill process

In mandrel-rolled pipe manufacturing process, billets are heated to high temperatures in a rotary furnace. The cylindrical hollow, also known as the female hollow, is produced with the help of a rotary piercer and a set of roller devices that hold the piercer in the center of the billet.

The outer diameter of the perforator is approximately the inner diameter of the finished tube. With the help of this, the alignment of the outer diameter and thickness of the secondary rolls is achieved.

 

 

Mannesmann Plug Mill Pipe Manufacturing Process

Mannesmann was a German engineer who has invented this pipe manufacturing process. The only difference between the Plug mill process and the Mandrel mill process is that in the mandrel method inside diameter is achieved in a single pass whereas in Mannesmann multi-stage reduction is possible.

 

 

Forged seamless tube manufacturing process

In the forged tube manufacturing process, a heated billet is placed in a dolly with a diameter slightly larger than the finished tube. Cylindrical forgings are made using a forging hammer hydraulic press with matching inside diameters.

Once this forging is complete, the pipe is machined to its final size. The forged pipe manufacturing process is used to create large diameter seamless pipes that cannot be manufactured by conventional methods. Forged pipe is typically used for steam manifolds.

 

Extrusion Process 

In extruded pipe manufacturing, a heated billet is placed inside a die. A hydraulic plunger pushes the billet against a piercing mandrel and the material flows out of a cylindrical cavity between the die and the mandrel. This action produces the pipe from the billet.

Sometimes the manufactured pipe is produced in a high thickness pipe called a female hollow. Many manufactured secondary pipes use this mother hollow to produce pipes of different sizes.