Duplex S31803 (2205) Round Bars
SS Duplex UNS S31803 alloys have Ferritic / Austenitic properties, giving these materials superior strength and excellent resistance to oxidation. While the Duplex Grade family includes a wide range of specific formulations, Duplex S31803 (2205) and Super Duplex S32750 (2507) / S32760 Stainless Steel are two of the most common. These stainless steel products are extremely versatile, with many applications in the oil and gas, petrochemical, and chemical processing industries.
Duplex UNS S31803, also known as stainless steel grade 2205, is a standardized formulation that conforms to UNS specification regulations. Its temperature range is typically listed as -50° to 300° C (-58° to 572° F); outside of this range, its performance characteristics degrade. Specifically, Duplex S31803's micro-components experience precipitation with prolonged exposure to high temperatures, and ductility suffers with immersion in extremely cold environments.
Duplex stainless steels are in most cases, tougher than ferritic stainless steels. Strengths of duplex stainless steels can in some cases be double that for austenitic stainless steels.
Whilst duplex stainless steels are considered resistant to stress corrosion cracking, they are not as resistant to this form of attack as ferritic stainless steels. However, the corrosion resistance of the least resistant duplex stainless steels is greater than that for the most commonly used grades of stainless steels, i.e. 304 and 316.
Duplex steels are also magnetic, a property that can be used to easily differentiate them from common austenitic grades of stainless.
Stock Range :
Round Bar - 14 mm Dia to 350 mm Dia
UNS S32205 / EN 1.4462 is the most common Duplex stainless steel, Also known as :
- 1.4462
- F51
- F60
- 4462
- X2CrNiMoN22-5-3
- S31803
- S32205
- SUS329J3L
- 4462-318-03-I
- Z2CND22.05.03
- 318S13
- 2377
- Duplex
- Duplex SS
- SAF 2205
- 2205
UNS S31803 Duplex Chemical Composition of 2205 :
| Elements | Min | Max |
| Carbon (C) | - | 0.030 |
| Manganese (Mn) | - | 2.00 |
| Phosphorus (P) | - | 0.030 |
| Sulpher (S) | - | 0.020 |
| Silicon (Si) | - | 1.00 |
| Chrome (Cr) | 21.00 | 23.00 |
| Nickel (Ni) | 4.50 | 6.50 |
| Nitrogen (N) | 0.08 | 0.20 |
| Molybdenum(Mo) | 2.50 | 3.50 |
Mechanical Properties of Duplex UNS S31803 Round Bars :
| Grade | Duplex |
| UNS Number | S31803 |
| Tensile Min (psi) | 90,000 |
| Yield Min (psi) | 65,000 |
| Elongation Min % | 25 |
| Reductions Min % | 50 |
| Hardness BHN | 290 Max |
Supplied Forms
- Fittings & Flanges
- Pipe
- Plate
- Sheet
- Tube
- Bar
Features of Duplex Round Bars :
- Excellent oxidation resistance
- Outstanding performance in marine/sea water environments
- Low thermal expansion coefficients
- High heat conductivity
Applications of 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
- Flue gas filters
- Chemical tanks
- Heat exchangers
- Acetic acid distillation components
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°C.
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°C.
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.
Heat Treatment :
Duplex stainless steels cannot be hardened by heat treatment. They can however be work hardened.
Solution treatment or annealing can be done by rapid cooling after heating to around 1100°C.
Weldability :
Duplex stainless steels have good weldability. All standard welding processes can be used. They are not quite as easily welded as the austenitic grades but low thermal expansion in duplex grades reduces distortion and residual stresses after welding. The recommended filler material for 2205 stainless steel is 2209.
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