Piercing process

The cross roll piercing and pilger rolling process in the size range from approx. 250 to 660 mm outside diameter.

Piercing process

Generally the billet is plastically deformed at a certain temperature environment, through a dedicated mold, the metal to produce a continuous smooth flow of the process to achieve the deformed geometry requirements.

Perforation is to wear a circular cross-section billet deformation tube made of wool.

Technology links are:
billet heating - high pressure water descaling - Thermal Centering - perforation - blow borax.

Billet heating:
the blank optimum temperature plastic, it is the basis for the entire steel rolling.

High-pressure water descaling:
remove the heat of the blank outer oxide scale, reducing system wear resistance.

Thermal Centering:
improve low plasticity steel plasticity, effectively reduce the axial perforation resistance, reduce head loss.

Blow Borax:
remove the inner capillary surface oxide for reduced rolling resistance.



Seamless pipe Specification, standard and identification

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.