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Description
Chemical Composition and Mechanical Properties of A2205 (S32205) Duplex Stainless Steel
A2205 (S32205) is a nitrogen-enhanced duplex stainless steel with the following composition and properties:Chemical Composition:
| Element | Percentage |
|---|---|
| Chromium | 22.0-23.0% |
| Nickel | 4.5-6.5% |
| Molybdenum | 3.0-3.5% |
| Nitrogen | 0.14-0.20% |
| Carbon (max) | 0.03% |
Mechanical Properties:
| Property | Value |
|---|---|
| Yield Strength (min) | 450 MPa (65,000 psi) |
| Tensile Strength | 620-850 MPa (90,000-123,000 psi) |
| Elongation (min) | 25% |
| Hardness (max) | 290 Brinell |
Applications and Industries Using A2205 Duplex Stainless Steel
A2205 is widely used in various industries due to its excellent combination of strength and corrosion resistance:
- Oil and gas: Pipelines, pressure vessels, heat exchangers
- Chemical processing: Storage tanks, reactors, piping systems
- Pulp and paper: Digesters, bleach washers, chip pre-steaming vessels
- Marine applications: Propeller shafts, pumps, valves
- Food and beverage: Processing equipment, storage tanks
- Desalination plants: Piping, heat exchangers
Corrosion Resistance and Performance Benefits
A2205 offers superior corrosion resistance compared to austenitic stainless steels like 316L:
- Excellent resistance to pitting and crevice corrosion
- High resistance to stress corrosion cracking in chloride environments
- Good general corrosion resistance in various media
- Superior erosion and fatigue resistance
The duplex microstructure provides a combination of strength and toughness, making it suitable for demanding applications.
Manufacturing Process and Available Dimensions
A2205 is typically produced through controlled rolling processes. Available dimensions for plates and coils include:
| Product Type | Thickness (mm) | Width (mm) | Length (mm) |
|---|---|---|---|
| Plate | 4 – 100 | 1000 – 3500 | 2000 – 12000 |
| Coil | 1 – 12 | 1000 – 1500 | Continuous |
Welding and Fabrication Considerations
A2205 has good weldability using common methods such as GTAW, GMAW, and SAW. Key considerations include:
- Proper heat input control to maintain phase balance
- Use of matching or over-alloyed filler metals
- Post-weld heat treatment generally not required
- Attention to interpass temperature to avoid excessive ferrite formation
Comparison of A2205 with Other Stainless Steel Grades
| Grade | Yield Strength (MPa) | Pitting Resistance Equivalent (PRE) |
|---|---|---|
| A2205 | 450 | 35-36 |
| 316L | 170 | 24-26 |
| 904L | 220 | 34-36 |
| 2507 Super Duplex | 550 | 40-43 |
A2205 offers a balance of strength and corrosion resistance, making it a cost-effective choice for many applications where austenitic grades may be insufficient.
At HL Steel Company, we offer high-quality A2205 (S32205) duplex stainless steel plates and coils tailored for various industrial applications, ensuring optimal performance and cost-effectiveness for your projects.
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