Mill scale is the flaky surface of hot rolled steel, iron oxides consisting of iron(II,III) oxide, hematite, and magnetite.

Mill scale is formed on the outer surfaces of plates, sheets or profiles when they are being produced by rolling red hot iron or steel billets in rolling mills. Mill scale is composed of iron oxides mostly ferric and is bluish black in color. It is usually less than 1 mm (0.039 in) thick and initially adheres to the steel surface and protects it from atmospheric corrosion provided no break occurs in this coating.

Mill scale generated in rolling mills will be collected and sent to sinter plant for recycling.

Minmets Ltd traded over 250,000MT of Mill scale materials from Middle East, Venezuela and Brazil in 2012.

Our Mill Scale typical Specification:

PRODUCT: Mill Scale

Specifications:

Fe-T               70% base

Si2O+CaO      2.99% max

P                  0.08% max

S                  0.08% max