Piercing process

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

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.