DUPLEX STAINLESS STEELS
Duplex stainless steel have a shared microstucture of austenitic and ferritic. They contain the strengths of both groups, that is why this group is named as Duplex.
Duplex grades were developed in the 1930's, but typical Duplex grades were mastered in the 1970's.
Duplex stainless steels contain 16 - 28% Chromium (Cr) content, 4,5 - 8 % Nickel (Ni) content and 2,5 - 5% Molybdenum (Mo) content. For improved strength, Nitrogen (N) is added in some grades. And for Nickel (Ni) replacement, Manganese (Mn) is added in some Duplex grades.
Most widely used Duplex grades are 1.4462 and 1.4362 grades.
All Duplex grades are magnetic, due to the ferritic content in them. They can not be hardened by heat treatment.
Their dual phase allows them to have high mechanical properties and very high corrosion resistance at the same time. They are also resistant to stress corrosion cracking and corrosion fatigue.
For higher strength, higher ductility and higher hardness duplex grades are preferred.
Duplex grades have good weldability, low thermal expansion and good energy absorption.
In medium heat environments, they are widely used in petrochemical industry, oil and gas industry, mining industry, in chemical environments and seaside applications.
They are found in coil, sheet, round bar, flat bar and tube forms. You may find duplex coils, sheets and round bars in Teknik Metal's ready stocks.
Given data is based on theoritical vaules and intended as informative purposes only. Given data may be revised at any time without prior notice. Stainless steels may vary in performance under different circumstances. Teknik Metal Endustri Malz. Tic. Ve San. A.S. disclaims any and every liability, and will not be held responsible for any consequences derived from the end use or the application of the materials.