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ASTM A790 2205 Duplex Stainless Steel Seamless Pipe with High Strength and Chloride Resistance
| MOQ: | 5Ton |
| Price: | Based on grade, size, surface, processing, quantity and current raw material market price. |
| Standard Packaging: | Standard seaworthy export packing with bundles, waterproof wrapping, pallets or wooden cases. |
| Delivery Period: | 7-15 |
| Payment Method: | L/C,D/P,D/A,T/T,Western Union |
| Supply Capacity: | Stock supply, regular production and custom manufacturing available. |
Shaanxi Shangyou Stainless Steel Co., Ltd. supplies ASTM A790 2205 duplex stainless steel seamless pipe for global distributors, EPC contractors, fabricators and project procurement teams. Manufactured to ASTM A790/A790M and ASME SA790 standards, 2205 seamless pipe delivers exceptional mechanical strength and corrosion resistance for oil & gas, chemical processing, marine and desalination applications.
UNS S32205 is an improved version of the original S31803 grade, featuring tighter composition control with higher chromium (22-23%), molybdenum (3.0-3.5%) and nitrogen (0.14-0.20%) content. This dual-phase microstructure of approximately equal austenite and ferrite provides the strength of ferritic grades combined with the toughness and corrosion resistance of austenitic grades. The material offers more than double the yield strength of 316L stainless steel, enabling lighter wall sections and significant weight savings in structural and piping applications.
| Parameter | Specification |
|---|---|
| UNS Designation | S32205 (preferred), S31803 |
| Common Name | 2205, Duplex 2205 |
| Product Standard | ASTM A790/A790M, ASME SA790 |
| Dimensional Standard | ASME B36.19M |
| OD Range | NPS 1/4" to NPS 30+ (13.7 mm to 762+ mm) |
| Wall Thickness | Schedules 5S, 10S, 40S, 80S, XXS |
| Length | Standard 6m or Customized |
| End Types | Plain End, Beveled End |
| Surface Finish | Pickled, Bright Annealed |
| Heat Treatment | Solution Annealed + Water Quenched |
| Inspection Tests | Hydrostatic, Eddy Current, UT (optional), ASTM A923 |
| Documents | MTC 3.1, Inspection Reports, Packing List |
| Property | S32205 (2205) |
|---|---|
| Chromium (Cr) | 22.0 – 23.0% |
| Nickel (Ni) | 4.5 – 6.5% |
| Molybdenum (Mo) | 3.0 – 3.5% |
| Nitrogen (N) | 0.14 – 0.20% |
| PREN | ≥ 36 |
| Tensile Strength (min) | 655 MPa |
| Yield Strength (min) | 450 MPa |
| Elongation (min) | 25% |
| Hardness (max) | 290 HBW |
ASTM A790 2205 duplex seamless pipe is specified for demanding service conditions where standard austenitic grades are inadequate.
Typical applications include:
- Offshore topside and subsea piping systems
- Chemical processing and organic acid handling
- Seawater intake and desalination plant piping
- Heat exchangers and condenser tubing
- Sour service (H2S-containing) environments
- Oil and gas production facilities
When selecting 2205 duplex seamless pipe, buyers should consider:
Corrosive Environment: 2205 (PREN ≥36) provides excellent resistance to chloride-induced pitting and stress corrosion cracking. For severe seawater conditions with crevices or stagnant zones, consider super duplex S32750/S32760 with PREN ≥40.
Temperature Range: Design temperature typically ranges from -50°C to 300°C. Above 300°C, the risk of embrittlement increases due to intermetallic phase formation. Below -40°C, 2205 maintains good impact toughness (≥100J) for most applications.
Welding Requirements: 2205 is weldable with controlled heat input and matching filler metal (typically 2209). Post-weld heat treatment is generally not required for properly welded joints, but may be specified for critical applications.
Strength and Weight Savings: With yield strength more than double that of 316L (450 MPa vs 170 MPa), 2205 allows significantly thinner wall sections, reducing overall weight and material costs while maintaining structural integrity.
ASTM A790 2205 duplex seamless pipes are packed with export-standard protection including plastic wrapping, edge protection, steel strapping and wooden cases or steel frames. Packaging can be adjusted according to pipe size, weight and shipping requirements.
Quality documents may include MTC 3.1, inspection reports, packing lists and other agreed certificates. PMI/OES (XRF) can identify Cr, Ni, Mo, but cannot independently confirm L/H carbon level differences—refer to MTC for complete verification.
For quality evaluation, customers should provide heat number, package identification, inspection records and product photos. Technical solutions will be provided according to specifications and contract requirements.
1. What is ASTM A790 2205 duplex stainless steel seamless pipe?
ASTM A790 2205 is a seamless ferritic/austenitic (duplex) stainless steel pipe with approximately equal austenite and ferrite microstructure, providing high strength and excellent chloride corrosion resistance.
2. What is the difference between S31803 and S32205?
S32205 has tighter composition control (22-23% Cr, 3.0-3.5% Mo, 0.14-0.20% N) compared to S31803, providing higher PREN (~36 vs ~34) and improved corrosion resistance. S32205 is the preferred "2205" grade for most modern specifications.
3. What does PREN mean for 2205 duplex pipe?
PREN (Pitting Resistance Equivalent Number) is calculated as Cr% + 3.3(Mo%) + 16(N%). For 2205 S32205, PREN is 36 or higher, indicating excellent resistance to pitting and crevice corrosion.
4. What is the minimum yield strength of ASTM A790 S32205?
The minimum yield strength for S32205 is 450 MPa (65 ksi), more than double that of 316L stainless steel (approximately 170 MPa).
5. Does ASTM A790 2205 pipe require heat treatment?
Yes. All ASTM A790 pipe must be solution annealed and rapidly quenched to achieve the target phase balance and avoid harmful intermetallic phase precipitation.
6. Can 2205 duplex pipe be used in seawater applications?
Yes, 2205 is commonly specified for seawater applications, particularly in offshore platforms and marine systems. For more severe conditions with crevices or stagnant seawater zones, S32750 (super duplex) is typically recommended.
7. How does 2205 duplex compare to 316L stainless steel?
2205 offers more than double the yield strength (450 vs 170 MPa), superior stress corrosion cracking resistance, and significantly higher pitting resistance (PREN 36 vs 24-26). This allows for lighter designs, longer service life and reduced lifecycle costs.
8. What is the maximum service temperature for 2205 duplex pipe?
The recommended design temperature range is -50°C to 300°C. Above 300°C, intermetallic phases (sigma, chi) may form, reducing toughness and corrosion resistance.
9. What tests are required by ASTM A790 for 2205 pipe?
Hydrostatic test (or Eddy Current), tensile test, and ASTM A923 intermetallic detection test are required. Additional tests (UT, PMI) may be specified by project requirements.
10. What documents are provided with delivery?
Typical documents include MTC 3.1, inspection reports, packing list, and heat number traceability for all material supplied. Third-party inspection (SGS, TUV, BV) is available upon request.
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