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Mill scale is iron oxide that forms on a surface during hot rolling of steel. During rolling, the high temperature involved causes oxide to form over the entire surface, which only increases in quantity as the rolling process progresses. The spots are often hard, but at the same time very brittle.
Apr 21, 2022 · Mill scale (also called scale) is the flaky surface that forms on hot-rolled steel. Its composition includes FeO (iron (II) oxide), Fe2O3 (iron (III) oxide), and Fe3O4 (iron (II,III) oxide). You will find mill scaling on steel sheets, plates, and profiles. It arises when you roll hot steel billets or iron in rolling mills.
Mill scale is the flaky surface of bluish-gray iron oxide that forms on hot steel as it cools after processing. While it might just seem like a cosmetic issue, mill scale can interfere with different industrial applications, especially welding, and painting.
First, what is mill scale? Mill scale is the thin layer of iron oxides that form on hot rolled steel. There are three distinct chemical compositions in mill scale, including FeO, Fe3O4, and Fe2O3. Mill scale can vary in thickness from 2 to 100 mils, depending on the quality of the steel and the rolling process. Mill scale is approximately 70% iron.
Feb 11, 2023 · Mill scale is a uniform layer of various iron oxides and other impurities that covers the surfaces of hot-rolled steel. When machinery rolls the hot steel to form it, the air’s oxygen reacts with the hot iron and creates these oxides. Mill scale has a black or black-blueish color and spreads evenly over the entire surface.
Apr 30, 2024 · This article will cover the source of mill scale, why it is an issue, and what you need to do to ensure that the coating you apply will achieve the life for which it was designed.
Oct 28, 2019 · Mill scale is a thin, flaky layer of iron oxide that forms on the surface of hot-rolled steel. It is used as a protective coating during storage and transport to prevent corrosion of the underlying steel. When welding, the mill scale must be removed from the surface of the to ensure a strong bond between the two pieces.
