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.
12.
Although sandblasting pipe internals to remove mill scale is one way to remove mill scale, it exposes the line surface to the atmosphere, which increases the corrosion rate during the initial hydrotest.
13.
Although sandblasting pipe internals to remove mill scale is one way to remove mill scale, it exposes the line surface to the atmosphere, which increases the corrosion rate during the initial hydrotest.
14.
Each roller brush spins against the steel at a speed of 900 to 1000 revolutions per minute, " scrubbing away " the outer layers of mill scale hematite and magnetite and most of the inner layer, wustite.
15.
In both cases, the objective of the process is to drive off the oxygen contained in various forms of iron ore ( sized ore, concentrates, pellets, mill scale, furnace dust etc . ), in order to convert the ore, without melting it ( below 1200 �C ), to metallic iron.
