Cross roll piercing and Pelger rolling process have a size range from approx. The outer diameter is 250 to 660 millimeters.
In general, the plastic deformation of the steel billet in a certain temperature environment, through the special mold, make the metal continuous smooth flow process, in order to achieve the requirements of deformation geometry.
Perforation is a circular cross section deformed 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.
