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These are stainless steels containing relatively high
chromium (between 18% and 28%) and moderate amounts of
nickel (between 4.5% and 8%). The nickel content is sufficient
to generate a fully austenitic structure and the resulting
combination of ferritic and austenitic structures is
called duplex. Most duplex steels contain molybdenum
in a range of 2.5% to 4%.
Basic properties
Increased resistance to chloride ion attack.
Higher tensile and yeld strenth than austenitic and ferritic steels.
Good weldability and formability.
Common uses
Marine applications particularly at slightly elevated
temperatures.
Desalination plants.
Heat exchangers.
Petrochemical plants.
Common grades
2205 Superior corrosion resistance to 316L used
in heat exchangers and marine and refinery applications.
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