Specifications: a) Fe: 70% Min, P: 0.08 Max, S: 0.08 Max, Al2O3: ... iron (2, 3) oxide, hematite and magnetite. Mill scale is formed on the outer surfaces of plates, sheets ... chemically cathodic to steel, any break in the mill scale coating will cause accelerated corrosion of steel exposed at ... days most steelsmills can supply their produce with mill scale removed and steel coated with shop primers over ...