Slitting Line

Selection criteria

Width tolerance, burr, camber.

Supply chain

Slitting lines are made by many Chinese and international suppliers and are usually run by steel service centres rather than motor makers. When buying slit coil, specify width tolerance, burr and camber, as these feed directly into die life and lamination quality.

Buyer FAQ

What tolerances should I specify for slit electrical-steel coil?

For progressive-die feeding, typical requirements are width within ±0.05–0.10 mm, burr height ≤ 0.02–0.03 mm on 0.35–0.50 mm strip, and camber of about 1 mm or less per 2 m length. Also specify coil inner diameter (often 508 mm), maximum outer diameter and weight to suit your decoiler.

What causes burr and camber in slitting?

Burr comes mainly from worn knives and incorrect horizontal clearance, commonly set at about 5–10 % of strip thickness for electrical steel. Camber comes from residual stress in the master coil, uneven strip tension and poor knife setup. Ask the slitter for knife regrind records and setup sheets per thickness.

Should I slit in house or buy slit coil?

Most motor makers buy slit coil from steel service centres, which spread line and knife costs across many customers. In-house slitting makes sense only with large, steady volumes of a few grades and widths. Either way, specify edge protection, rust-preventive packaging and coil labelling that traces back to the mill coil number.

Where it is used