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ASTM A790 2507 Super Duplex Stainless Steel Seamless Pipe with Superior Chloride and Pitting 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/A,D/P,T/T,Western Union |
| Supply Capacity: | Stock supply, regular production and custom manufacturing available. |
Shaanxi Shangyou Stainless Steel Co., Ltd. supplies ASTM A790 2507 super duplex stainless steel seamless pipe for global distributors, EPC contractors, fabricators and project procurement teams. Manufactured to ASTM A790/A790M and ASME SA790 standards, 2507 seamless pipe delivers ultra-high mechanical strength and exceptional corrosion resistance for offshore platforms, subsea systems, chemical processing and seawater handling applications.
UNS S32750, commonly known as 2507, is a super duplex stainless steel with higher chromium (24-26%), molybdenum (3-5%) and nitrogen (0.24-0.32%) content compared to standard 2205 duplex grades. This 25% chromium super duplex microstructure provides a PREN (Pitting Resistance Equivalent Number) of 42 or higher, making it one of the most corrosion-resistant stainless steel pipe materials available for severe chloride service. With minimum yield strength of 550 MPa, 2507 offers more than three times the yield strength of 316L stainless steel, enabling substantial wall thickness reduction and significant weight savings in critical piping systems.
| Parameter | Specification |
|---|---|
| UNS Designation | S32750 (2507) |
| Common Name | 2507, Super Duplex 2507 |
| 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 | S32750 (2507) |
|---|---|
| Chromium (Cr) | 24.0 – 26.0% |
| Nickel (Ni) | 6.0 – 8.0% |
| Molybdenum (Mo) | 3.0 – 5.0% |
| Nitrogen (N) | 0.24 – 0.32% |
| PREN | ≥ 42 |
| Tensile Strength (min) | 800 MPa |
| Yield Strength (min) | 550 MPa |
| Elongation (min) | 15% |
| Hardness (max) | 310 HBW |
ASTM A790 2507 super duplex seamless pipe is specified for the most demanding service conditions where standard duplex and austenitic grades are inadequate.
Typical applications include:
- Offshore topside and subsea piping systems
- Seawater intake, brine outfall and firewater systems
- Chemical processing with aggressive chlorides and acids
- Desalination plant high-pressure piping
- Sour service (H2S-containing) environments
- Heat exchangers and condenser tubing
- Umbilical cable and hydraulic tubing systems
When selecting 2507 super duplex seamless pipe, buyers should consider:
Corrosive Environment: 2507 (PREN ≥42) provides superior resistance to chloride-induced pitting and stress corrosion cracking, making it ideal for seawater, brine and aggressive chemical service. For less severe environments where PREN 36 is sufficient, 2205 may offer a more cost-effective solution.
Temperature Range: Design temperature typically ranges from -50°C to 300°C. Above 300°C, the risk of intermetallic phase formation increases significantly. 2507 maintains excellent impact toughness at low temperatures.
Welding Requirements: 2507 is weldable with controlled heat input (typically ≤1.5 kJ/mm) and matching super duplex filler metal. Post-weld heat treatment is generally not required, but preheating is not recommended. Filler metal selection and heat input control are critical to maintain the required phase balance and corrosion resistance.
Strength and Weight Savings: With yield strength more than three times that of 316L (550 MPa vs 170 MPa) and significantly higher than 2205 (550 MPa vs 450 MPa), 2507 allows the greatest wall thickness reduction among duplex pipe products.
Cost Consideration: 2507 carries a premium over standard 2205 duplex. Full lifecycle cost analysis—including material cost, fabrication, maintenance, and service life—is recommended. Select 2507 when 2205 cannot meet the corrosion or strength requirements.
ASTM A790 2507 super 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 2507 super duplex stainless steel seamless pipe?
ASTM A790 2507 is a seamless ferritic/austenitic (super duplex) stainless steel pipe with 25% chromium content, PREN ≥42, and minimum yield strength of 550 MPa, designed for the most severe corrosive environments.
2. What is the difference between 2205 and 2507 duplex pipe?
2507 contains higher chromium (24-26% vs 22-23%), molybdenum (3-5% vs 3.0-3.5%) and nitrogen (0.24-0.32% vs 0.14-0.20%), providing higher PREN (≥42 vs ≥36) and yield strength (550 vs 450 MPa). 2507 is specified for more aggressive seawater and chemical service conditions.
3. What does PREN mean for 2507 super duplex pipe?
PREN (Pitting Resistance Equivalent Number) is calculated as Cr% + 3.3(Mo%) + 16(N%). For 2507 S32750, PREN is 42 or higher, indicating superior resistance to pitting and crevice corrosion in chloride-containing environments.
4. What is the minimum yield strength of ASTM A790 S32750?
The minimum yield strength for S32750 is 550 MPa (80 ksi), more than three times that of 316L stainless steel (approximately 170 MPa).
5. Does ASTM A790 2507 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 2507 super duplex pipe be used in seawater applications?
Yes, 2507 is specifically designed for seawater and high-chloride applications. With PREN ≥42, it provides superior resistance to pitting, crevice corrosion and stress corrosion cracking in marine environments.
7. What welding considerations are required for 2507 pipe?
2507 requires controlled heat input (typically ≤1.5 kJ/mm), matching super duplex filler metal, and careful interpass temperature control. Preheating is generally not recommended.
8. What is the maximum service temperature for 2507 super 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 2507 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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