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CorTen steel is corrosion resistant steel or weathering steel. When left uncoated and exposed to an outside wet-dry atmosphere it develops a layer of oxidation, which as well as giving it its dark brown or 'rust' coloured appearance over time, creates a protective layer which ‘sticks’ to the base metal to help protect the steel from additional corrosion. Can also be painted in the same way as ordinary mild steel.
Please note that the colour of the CorTen sheet supplied is 'silver' and changes to the 'rust colour' over time when it is exposed to an outside wet-dry atmosphere.
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