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Duplex stainless steels were born and have been actively developed by European companies since 1935. In view of the continuous improvement of their properties and their growing availability, Duplex stainless steels will remain an attractive solution to the future needs of designers and users in mechanical engineering.
These are the most popular of the stainless steels because of their ductility, ease of working and good corrosion resistance; they are derived from the 18Cr-8Ni stainless steel Type 304. The other grades are developed to provide special corrosion resistance properties by adding Molybdenum, Chromium and/or decreasing Carbon content (L grades).