Mill Scale


Mill scale, often shortened to just 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. It is composed of iron oxides mostly ferric and is bluish black in color and 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.


Origin: Pakistan


Specifications a) Fe 65%, SiO2 4.00% Max, CaO 1% Max, Moisture 1% Max

b) Fe 66%, SiO2 3.60 % Max, CaO 1% Max, Moisture 1% Max

c) Fe 67%, SiO2 3.50 % Max, CaO 1% Max, Moisture 1% Max

d) Fe 68%, SiO2 3.40 % Max, CaO 1% Max, Moisture 1% Max