Hot Piercing Workshop
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.
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.
improve low plasticity steel plasticity, effectively reduce the axial perforation resistance, reduce head loss.
remove the inner capillary surface oxide for reduced rolling resistance.