The quantity of each layer depends on the storing of rod coil at different temperatures and atmosphere. Generally the rods with good mechanical de-scalability, scale proportion shall be in between 0.6% to 1% of rod weight. The rod coils less than the above proportion shall be with more elastic oxides and difficult to remove by Mechanical De-scaling.
The following process classification with respect to the relative scale thickness shall be used as guideline for processing the rod coils.
- Mechanical De-scaling for scale thickness above 15 microns.
- Both Mechanical de-scaling and chemical cleaning for scale thickness 10 to 15 microns.
- Chemical cleaning / pickling for scale thickness less than 10microns.