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Stainless Steel - Grade ER2209/1.4462
Description
ER2209/1.4462 is a duplex stainless steel filler metal designed for welding austenitic-ferritic stainless steel alloys containing approximately 22% chromium, 5% nickel, and 3% molybdenum. It exhibits high tensile strength, resistance to stress corrosion cracking, and improved weldability compared to the base metal.
Chemical Composition
| Element | Weight % |
|---|---|
| Carbon (C) | 0.03 max |
| Manganese (Mn) | 0.50-2.0 |
| Silicon (Si) | 0.90 max |
| Chromium (Cr) | 21.5-23.5 |
| Nickel (Ni) | 7.5-9.5 |
| Sulfur (S) | 0.03 max |
| Phosphorus (P) | 0.03 max |
| Molybdenum (Mo) | 2.5-3.5 |
| Copper (Cu) | 0.75 max |
| Nitrogen (N) | 0.08-0.20 |
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Mechanical Properties
Duplex 2205 exhibits superior mechanical properties compared to standard austenitic stainless steels:
- Ultimate Tensile Strength: 104,400 psi (720 MPa)
- Yield Strength (0.2% offset): 81,200 psi (560 MPa)
- Elongation: 26%
Thermal & Physical Properties
- Coefficient of Thermal Expansion (20-100°C): 13.5 x 10^-6 /°C
- Thermal Conductivity (20°C): 15 W/m•K
- Density: 7.8 g/cm³
Other Designations
- UNS Number: S39209
- AWS Classification: ER2209
- DIN Number: 1.4462
Fabrication and Heat Treatment
- Welding: GTAW, GMAW, SAW
- Shielding Gas: 100% Argon for GTAW, Argon + 2% Oxygen for GMAW
- Flux: Agglomerated or fused for SAW
- Heat Treatment: Solution annealing at 1040-1100°C followed by water quenching
Applications
- Welding of duplex stainless steel pipes and fabrications in the offshore oil and gas, chemical processing, and pulp and paper industries
- Cladding of carbon and low-alloy steels to obtain corrosion-resistant layers
Supplied Forms
- Solid wire for GTAW, GMAW, and SAW processes
- Available in various diameters and spool/coil sizes
Features
- High tensile strength and resistance to stress corrosion cracking
- Improved resistance to pitting and intergranular corrosion in chloride and hydrogen sulfide-containing environments
- Suitable for welding duplex stainless steels with 22% chromium, such as UNS S31803 and S32205