Products Description
Product Specifications
| Standards | ASTM A790 / ASME SA-790 |
| Steel Grades | UNS S31803 / UNS S32205 (Duplex 2205) |
| Equivalent Standards | EN 1.4462; JIS SUS 329J3L; GB 022Cr22Ni5Mo3N |
| Outer Diameter (OD) | 5mm-630mm |
| Wall Thickness (WT) | 0.5mm-55mm |
| Length | 6/12m, or customized |
| Surface Treatment |
Pickled & Passivated |
| Production Process | Hot rolling/extrusion, cold finishing (optional) |
| Condition | Solution annealed |
2205 duplex stainless steel is a composite alloy composed of 22% chromium, 3% molybdenum, and 4.5% nickel-nitrogen. This duplex steel is particularly well-suited for applications within the temperature range of -50°F to +600°F.
Duplex 2205 stainless steel pipe exhibits excellent resistance to chloride stress corrosion cracking, making it ideal for applications such as seawater cooling systems and ballast tanks on offshore platforms.
The yield strength of 2205 duplex stainless steel reaches 400–550 MPa-twice that of standard austenitic stainless steel. Under identical design pressures and operating conditions on offshore platforms, the use of 2205 stainless steel allows for a significant reduction in pipe weight and material consumption; this makes it highly suitable for installation scenarios on offshore platforms that present logistical challenges, such as those involving high-altitude or deep-sea environments.
Customized Services
- TORICH offers custom sizing services, designed in accordance with pressure ratings (based on ANSI/ASME B36.10/B36.19 standards or specific project requirements).
- In addition to Grade 2205 stainless steel, we supply a wide range of other duplex stainless steel grades, including S31200, S31260, S31500, S32003, S32101, S32202, S32304, S32506, S32520, S32550, S32707, S32750, and S32760.
- We also provide various end-finishing services, such as beveling, threading, plain/grooved ends, and the fabrication of spool pieces.
Chemical Composition
| Element | C (max) | Mn (max) | Si (max) | P (max) | S (max) | Cr | Ni | Mo | N |
| 2205 | 0.03 | 2.0 | 1.0 | 0.030 | 0.020 | 21–23 | 4.5–6.5 | 2.5–3.5 | 0.14–0.20 |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
| Value | ≥ 620 MPa | ≥ 450 MPa | ≥ 25% | ≤ 290 |
Possible Alternative Grades
- For extreme marine environments, S32750 super duplex stainless steel-characterized by a PREN of ≥ 40–45-is a suitable choice, offering high resistance to chlorides and being applicable for operating temperatures of approximately 300°C.
- For operating environments with chloride levels below 1,000 ppm, S32304 duplex stainless steel is a viable option; it is cost-effective and offers superior corrosion resistance compared to 304L.
- For extreme corrosive environments involving higher operating temperatures, nickel-based alloys such as Alloy 625 are recommended, as they can withstand high-temperature conditions exceeding 600°C.
application areas
ASTM A790 Duplex 2205 Stainless Steel Pipe is designed to withstand the rigorous operating conditions of offshore platforms and is widely utilized across various core piping systems on offshore oil and gas installations. Specific applications include:
- Oil and Gas Transport Systems: Offshore platform crude oil and natural gas transmission pipelines, wellhead equipment connection lines, and oil-gas separation system piping.
- Seawater Treatment Systems: Seawater cooling lines, desalination system piping, ballast tank intake and discharge lines, etc.
- Fire Protection Systems: Offshore platform firewater lines and foam fire suppression system piping.
- Desulfurization and Denitrification Systems: Offshore platform Flue Gas Desulfurization (FGD) system piping and denitrification medium transport lines.
- Deep-Sea Operations Equipment: Deep-sea drilling platform piping, subsea pipeline connection sections, etc.
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: Why are ASTM A790 Duplex 2205 pipes suitable for offshore platforms?
A: They offer excellent resistance to high salinity, humidity, pressure, and corrosion. Their service life is typically 3–5× longer than 316L, reducing maintenance costs and minimizing downtime risks.
Q: Are there special welding requirements?
A: Yes. Use matching consumables (e.g., ER2209), keep interpass temperature below 150°C, and control heat input to maintain proper duplex structure. Post-weld heat treatment may be required.
Q: Is the packaging suitable for offshore transport?
A: Yes. Pipes are wrapped with plastic film, covered with woven bags, and secured on wooden pallets to protect against moisture and salt spray during transit.
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