Seamless Welded 2205 Duplex Stainless Steel Tubing ASTM A790
2205 duplex stainless steel pipe offers a balanced combination of high strength and excellent corrosion resistance, making it the preferred choice for industries such as oil & gas, chemical processing, marine engineering, and desalination plants.
With a duplex microstructure (approximately 50% austenite + 50% ferrite), 2205 provides nearly twice the yield strength of common austenitic stainless steels like 304 or 316L, while maintaining good weldability and fabricability.
| Feature | Description |
|---|---|
| High Yield Strength | Minimum 450 MPa (65 ksi) – approximately 2x stronger than 316L |
| Outstanding Corrosion Resistance | Excellent resistance to stress corrosion cracking (SCC), pitting, and crevice corrosion |
| Chloride Resistance | Ideal for seawater, brackish water, and high-chloride environments |
| Good Weldability | Suitable for GTAW, SMAW, and GMAW processes with proper filler metal (e.g., 2209) |
| Cost-Effective Alternative | Lower cost than nickel-based alloys while offering comparable performance |
| Wide Temperature Range | Serviceable from -50°C to 300°C depending on application |
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 2.00 |
| Chromium (Cr) | 21.0 – 23.0 |
| Nickel (Ni) | 4.5 – 6.5 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Nitrogen (N) | 0.08 – 0.20 |
| Iron (Fe) | Balance |
| Property | Value |
|---|---|
| Tensile Strength | ≥ 620 MPa |
| Yield Strength (0.2% offset) | ≥ 450 MPa |
| Elongation | ≥ 25% |
| Hardness (HRC) | ≤ 30 |
| Density | 7.8 g/cm³ |
ASTM A789 – Seamless and welded ferritic/austenitic stainless steel tubing for general service
ASTM A790 – Seamless and welded ferritic/austenitic stainless steel pipe
ASME SA789 / SA790 – Boiler and pressure vessel code
EN 10216-5 / EN 10217-7 – European standards for duplex steel pipes
NACE MR0175 / ISO 15156 – Suitable for sour service environments
| Parameter | Range |
|---|---|
| Outer Diameter (OD) | 6.0 mm – 610 mm (1/4″ – 24″) |
| Wall Thickness (WT) | 0.5 mm – 50 mm |
| Length | Customized (up to 12 meters or as required) |
| Type | Seamless / Welded |
| Industry | Typical Applications |
|---|---|
| Oil & Gas | Offshore platforms, subsea pipelines, flowlines, and process piping |
| Chemical & Petrochemical | Heat exchangers, pressure vessels, and reaction tanks |
| Marine & Shipbuilding | Seawater cooling systems, ballast water treatment, and desalination plants |
| Pulp & Paper | Digesters and bleaching systems |
| Water Treatment | Reverse osmosis (RO) plants, high-pressure piping |
| Construction | Bridges, structural components in coastal areas |
Q: What is the difference between 2205 and 316L stainless steel?
A: 2205 offers approximately twice the yield strength of 316L and significantly better resistance to chloride stress corrosion cracking, making it more suitable for marine and chemical applications.
Q: Can 2205 duplex pipe be welded to 316L?
A: Yes, but requires proper filler metal (e.g., 309L or 2209) and qualified welding procedures. We recommend consulting our technical team for specific cases.
Q: Is 2205 duplex stainless steel magnetic?
A: Yes, due to its ferrite phase, 2205 is slightly magnetic – unlike fully austenitic grades like 304 or 316.
Q: Do you provide cutting and threading services?
A: Yes, we offer custom cutting, beveling, threading, and grooving to meet your installation requirements.
Tell us your required size, quantity, standard, and delivery port, and we will reply within 24 hours with a competitive price.
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