Duplex Stainless Steel
What is Duplex Stainless Steel?
Duplex stainless steels refer to a family of stainless steels that include a carbide mixture. Their metallurgical structure: austenite (face-centered cubic lattice) and ferrite (body-centered cubic lattice). They are called duplex (or austenitic-ferritic) grades due to the mechanical configuration.
How is Duplex Stainless Steel made?
Duplex stainless steel contracts after being heated to between 1470 and 1550°C (3000 to 3000 degrees Fahrenheit), 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 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 Duplex Stainless Steel?
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.
Countries We Supply Duplex Steel To
Steelco Metal & Alloys supply and distribute Duplex Steel products to countries like:
United States
Europe
Middle East
Africa
and more…
Duplex Stainless Steel Grades
| Grade | EN No/UNS | Type | Approx Composition | ||||||
|---|---|---|---|---|---|---|---|---|---|
|
- |
- |
- |
Cr |
Ni |
Mo |
N |
Mn |
W |
Cu |
|
2101 LDX |
1.4162/
S32101
|
Lean |
21.5 |
1.5 |
0.3 |
0.22 |
5 |
- |
- |
|
DX2202 |
1.4062/ S32202 |
Lean |
23 |
2.5 |
0.3 |
0.2 |
1.5 |
- |
- |
|
RDN 903 |
1.4482/
S32001
|
Lean |
20 |
1.8 |
0.2 |
0.11 |
4.2 |
- |
- |
|
2304 |
1.4362/
S32304
|
Lean |
23 |
4.8 |
0.3 |
0.10 |
- |
- |
- |
|
2205 |
1.4462/
S31803/
S32205
|
Standard |
22 |
5.7 |
3.1 |
0.17 |
- |
- |
- |
|
2507 |
1.4410/
S32750
|
Super |
25 |
7 |
4 |
0.27 |
- |
- |
- |
|
Zeron 100 |
1.4501/
S32760
|
Super |
25 |
7 |
3.2 |
0.5 |
- |
0.7 |
0.7 |
Mechanical Properties of Duplex stainless steel
| Grade | 2205 | UR52N+ |
|---|---|---|
|
Tensile Strength (MPa) |
620 |
770
|
|
Proof Stress 0.2% (MPa) |
450 |
550 |
|
Elongation A5 (%) |
25 |
25 |
Industrial Application of Duplex Steel
- Power generation
- Aerospace gas turbines
- Turbines in nuclear power plants
- Chemical Industries
- Oil & Gas Industries
- Automotive & Transportation Industries.
Physical Properties of Duplex stainless steel
| Property | 2205 | UR52N+ |
|---|---|---|
|
Density (g.cm3) |
7.805 |
7.810 |
|
Modulus of Elasticity (GPa) |
200 |
205 |
|
Elongation A5 (%) |
25 |
25 |
|
Electrical Resistivity (Ω.m) |
0.85 x 10-6 |
0.85 x 10-6 |
|
Thermal Conductivity (W/m.K) |
19 at 100 °C |
17 at 100 °C |
|
Thermal Expansion (m/m.K) |
13.7 x 10-6 to 100 °C |
13.5 x 10-6 to 200 °C |
Benefits of 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.
Welding
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.
Competitive Advantage of Steelco Metal & Alloys
- Quality Control System
- 100% Satisfaction Guarantee
- Highly Professional Staff
- Accurate Testing Processes
FAQ
Duplex steels contain approximately 50% austenite and 50% ferrite, making them ideal for use in a wide range of environments.
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, duplex stainless steels display properties similar to those of ferritic and austenitic stainless steels and it is available in grades – S31500, S32304, S32404 and so on.
The price of 1kg Duplex Steel in India is around Rs 500/-* To know more about price contact us
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