CorTen steel is corrosion resistant steel or weathering steel and is popular for use outdoors due to its rust coloured apperance. When left uncoated and exposed to an outside wet-dry atmosphere it develops an initial layer of oxidation, which as well as giving it its dark brown or 'rust' coloured appearance over time helps to protect the base metal.
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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