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Glossary

The Kallanish Glossary aims to be a useful resource for complex industry specific terminology. We are constantly adding to our glossary, so if you have a suggestion or amendment please do get in touch.

Mill Scale

Steel

Mill scale forms on the surface of steel when oxygen reacts with very hot metal to form iron oxides. This occurs immediately after casting, and during reheating and hot rolling. The scale, which can range in size from a few microns to several centimetres across, has to be removed, otherwise it will damage the surface finish of the steel during any subsequent rolling. High pressure water jets are used to blast away the scale, and on a hot strip mill this occurs as the steel passes down the run-out table from the roughing mill.

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