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To create a high-quality surface for rolling, the broadest sides of a metal ingot are shaved by a machine with rotating blades, called a scalper. Scalping removes any irregularities or unwanted chemical compositions left on the surface of the ingot by the casting process.

The scalper uses large horizontal blades with a span of about five feet (1.5m), which rotate on a vertical axle. These blades mill the rolling faces – the widest faces – of the ingot, scalping one side then the other to produce the desired surface finish prior to rolling.

Manual inspection would be extremely hazardous close to the rotating blades, but an automated, real-time inspection system can verify the success of the scalping operation without affecting process speeds. It also allows the scalped ingot to progress to the next stage of the production process without a delay for visual inspection.
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