Super Duplex Steel

Super Duplex Steel

What is Super Duplex Stainless Steel?

Super duplex stainless is the same material as duplex, but the mix is 50/50 stainless steel made of ferritic and austenite. Super duplex has a higher Molybdenum and Chromium content, which makes this material more corrosion-resistant.

How is Super Duplex Stainless Steel made?

Super duplex stainless steel contracts after being heated to between 1470 and 1550°C, transforming it into an alloy known as annealing. In annealing, duplex undergoes a slight change in the texture of its crystal structure, making its surface thicker and more ductile. After the process of producing super duplex stainless steel is complete, it must be annealed (heat-treated) and pickled (treated to prevent corrosion) before it is ready for use.

What are the advantages of Super Duplex Stainless Steel?

Super duplex stainless steel has a microstructure that contains both ferrite and austenite. When this material is heated to the point of melting, it solidifies from a liquid state to a pure austenitic structure. As it cools, approximately half of its structure changes to a ferrite phase. This results in an alloy with the structure of around half ferrite and half austenite. Duplex alloys have higher strength and greater corrosion-cracking resistance than ferritic alloys and a higher strength at low temperatures.

Super Duplex Stainless Steel Grades

Standard Symbol
ASTM B 111
C 70600
BS 2871 Part 3
CN 102
EN 12451
CuNi10 Fe 1Mn
NFA51 102
C 7060
EEMUA Pub 144 1987
NES 779 Part 3
90/10 CuNi

Mechanical Properties of Super Duplex stainless steel

Grade Heat Treatment Temperature σb (Mpa) σs(Mpa) δ% Brinell Hardness Rockwell Hardness
S32750 (SAF 2507)
1025 - 1125
S31803(SAF 2205)
1020 - 1100
980 - 1040

Countries We Supply Super Duplex Steel To

Steelco Metal & Alloys supply and distribute Super Duplex Steel products to countries like:

US United States

Europe Europe

Middle East Middle East

Africa Africa

and more…


Benefits of Super Duplex Stainless Steel

Corrosion Resistance

Duplex stainless steel is exceptionally resistant to intergranular corrosion. In chloride and sulfide environments, Duplex stainless steel has exceptional resistance to stress-corrosion cracking.

Heat Resistance

High chromium content allows Duplex stainless steel to withstand corrosion, resulting in brittleness at temperatures over approximately 300° C. Duplex stainless steels exhibit higher ductility at low temperatures. Alloys of this grade can be readily used down to approximately -50° C.


Duplex stainless steel has excellent weldability. All standard welding techniques can be applied. They are not quite as strong as the austenitic grades but low thermal expansion of the duplex grades reduces distortion and residual stresses after welding. Recommended filler material for 2205 stainless steel is 2209.


Industrial Application of Duplex Steel

Super Duplex Steel is highly versatile and has excellent resistance to heat and corrosion properties. As a result, it can be used across a wide range of industries, such as:

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Super duplex steels contain approximately 50% austenites and 50% ferrites, making them ideal for use in a wide range of environments.

Super duplex steel contains alloys that make it highly resistant to corrosion, thereby making it best suitable for wide-range of industries like automotive and aerospace applications, manufacturing, chemical industries and more.

Their microstructures contain a mixture of austenite and ferrite phases. As a result, super duplex stainless steels display properties similar to those of ferritic and austenitic stainless steels and it is available in grades – 2507 and 4501.

The price of 1kg Super Duplex Steel in India is around Rs 500/-* To know more about price contact us.

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    Explore our Super Duplex Stainless Steel Products

    At Steelco metal and alloy we offer Duplex Stainless Steel Products. Which are being used in many different industries.

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