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DIN1.4462 Stainless Steel

DIN 1.4462 Stainless Steel


Stainless steel S31803(Alloy2205,F51,DIN1.4462) is a ferritic-austenitic duplex stainless steel . It provides a valuable combination of high strength, excellent corrosion resistance and stress-corrosion cracking resistance as well as very good pitting resistance. In addition, it is highly resistant to stress and provides a low level of thermal expansion.  These materials have a variety of applications that include heat exchangers, piping, pressure vessels, tanks, fans, rotors, pulp and paper production equipment, oilfield equipment and press rolls.



Chemical Element

% Present

Carbon (C)

0.0 - 0.03

Chromium (Cr)

21.00 - 23.00

Manganese (Mn)

0.0 - 2.00

Silicon (Si)

0.0 - 1.00

Phosphorous (P)

0.0 - 0.03

Sulphur (S)

0.0 - 0.02

Nickel (Ni)

4.50 - 6.50

Nitrogen (N)

0.10 - 0.22

Molybdenum (Mo)

2.50 - 3.50

Iron (Fe)



Physical Property



7.805 g/cm3

Thermal Expansion

13.7 x10^-6 /K

Modulus of Elasticity

200 GPa

Thermal Conductivity

19.0 W/m.K

Grade 1.4462/2205 is equivalent to:

UNS S31803

UNS S32205

BS 318S13


Supplied Forms

Fittings & Flanges




Duplex stainless steels are typically used in:

Chemical processing, transport and storage

Oil and gas exploration and offshore rigs

Oil and gas refining

Marine environments

Pollution control equipment

Pulp & paper manufacturing

Chemical process plant

Corrosion Resistance


Corrosion Resistance

Duplex stainless steels are extremely corrosion resistant. They have high resistance to intergranular corrosion. Even in chloride and sulphide environments, duplex stainless steels exhibit very high resistance to stress corrosion cracking.

The super duplex grades are even more resistant to corrosion.


Heat Resistance


The high chromium content of duplex stainless steels that protects against corrosion, causes embrittlement at temperatures over about 300 centigrade degree.

At low temperatures duplex stainless steels have better ductility than the ferritic and martensitic grades. Duplex grades can readily  be used down to at least -50 centigrade degree.



Fabrication of all stainless steels should be done only with tools dedicated to stainless steel materials. Tooling and work surfaces must be thoroughly cleaned before use. These precautions are necessary to avoid cross contamination of stainless steel by easily corroded metals that may discolour the surface of the fabricated product.


Although machinable, the high strengths of duplex stainless steels makes machining difficult. As an example, machining of 2205 is around 20% slower than for 304.



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