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) |
Balance |
|
Physical Property |
Value |
|
Density |
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
Pipe
Plate
Sheet
Tube
Bar
Applications
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
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.
Machinability
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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