Pickling Line & Cold Rolling Mill

Selection criteria

Automatic gauge control, flatness, surface quality.

Supply chain

Cold rolling and pickling lines come from global metallurgical suppliers and Chinese engineering groups. Thickness uniformity achieved here is what lets your stamping house hold stack height; ask mills for transverse thickness data when qualifying a grade.

Buyer FAQ

Why does strip thickness variation matter for my cores?

Gauge variation and crown (a thicker centre than edges) make stacks with the same lamination count differ in height and lower the stacking factor. Standard thickness tolerances are fairly wide, several percent of nominal, but mills with good automatic gauge control deliver much tighter coils. Ask for actual longitudinal and transverse thickness data, not just compliance with the standard.

What flatness and surface defects should I check on incoming coil?

Edge wave, centre buckle and coil set cause misfeeds and poor stacking in high-speed progressive dies. Flatness is commonly specified as a wave factor of ≤ 1.5 %. Also inspect for scratches, roll marks, rust and coating damage, and agree a defect-marking and claims procedure with the mill or service centre.

0.50, 0.35 or 0.20 mm: how do I choose the gauge?

Eddy-current loss scales roughly with thickness squared, so thinner steel pays off at higher frequencies, typically above about 200 Hz as in high-speed BLDC and EV traction motors. Thinner strip costs more per tonne, reduces stacking factor and increases die wear and stroke count per core. For 50/60 Hz induction motors, 0.50 mm is usually the economic choice.

Where it is used