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ASTM A790 S32750 Super Duplex Stainless Steel Welded Pipe PREN 42 High Strength Chloride Corrosion Resisting Service
| 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 S32750 super duplex stainless steel welded pipe for global EPC contractors, offshore engineers, chemical processors, and marine fabricators requiring ultra-high-strength piping with exceptional resistance to chloride-induced pitting, crevice corrosion, and stress corrosion cracking in the most aggressive environments. Produced to ASTM A790/A790M, this specification covers seamless and straight-seam welded ferritic/austenitic (duplex) steel pipe for general corrosive service, with particular emphasis on resistance to stress corrosion cracking.
ASTM A790 is the primary pipe specification for duplex stainless steel. S32750 (also known as 2507, UNS S32750, SAF™ 2507, EN 1.4410) is a super duplex grade with 24.0-26.0% chromium, 6.0-8.0% nickel, 3.0-5.0% molybdenum, and 0.24-0.32% nitrogen. This high-alloy composition delivers a PREN (Pitting Resistance Equivalent Number) above 42, significantly exceeding duplex 2205's ~35 PREN. The resulting dual-phase microstructure (approximately 50% ferrite and 50% austenite after proper heat treatment) provides yield strength 550 MPa (80 ksi) minimum—more than triple that of 316L. The pipe shall be made by an automatic welding process without the addition of filler metal and must be solution annealed and water quenched at 1025-1125°C to achieve the required microstructure.
| Dimension | Specification |
|---|---|
| Product Name | ASTM A790 S32750 Super Duplex Stainless Steel Welded Pipe |
| Product Alias | 2507 Welded Pipe / UNS S32750 Pipe / EN 1.4410 Pipe / SAF™ 2507 Pipe / Super Duplex Pipe |
| Material Type | Super Duplex Stainless Steel (Austenite-Ferrite, ~50% each) |
| Key Feature | PREN 42+; 550 MPa min yield; superior chloride resistance; solution annealed; autogenous welded no filler |
| UNS Number | UNS S32750 |
| EN Equivalent | EN 1.4410 (X2CrNiMoN25-7-4) |
| Chemical Composition | Cr 24.0-26.0% / Ni 6.0-8.0% / Mo 3.0-5.0% / N 0.24-0.32% / C ≤0.030% / Mn ≤1.20% / Si ≤0.80% / Fe Balance |
| Mechanical Properties | Tensile ≥795 MPa (116 ksi) / Yield ≥550 MPa (80 ksi) / Elongation ≥15% / Hardness ≤310 HBW |
| Heat Treatment | Solution annealed at 1025-1125°C + water quench or rapid cool |
| PREN | ≥42 |
| Critical Pitting Temp (CPT) | ~65°C in 6% FeCl3 (vs ~35°C for 2205) |
| Manufacturing Process | Plate/Coil Forming → Automatic Welding (No Filler Metal) → Solution Annealing → Quenching → Sizing → Hydro/NDE Testing |
| Primary Applications | Offshore Platforms / Subsea Piping / Chemical Processing / Desalination / Seawater Systems / Sour Service |
| Parameter | Available Options |
|---|---|
| Product Standard | ASTM A790/A790M, ASME SA-790 |
| UNS Equivalent | UNS S32750 |
| Nominal Pipe Size (NPS) | 1/2″ to 24″+ standard; larger on request |
| Wall Thickness | Schedule 5S, 10S, 40S, 80S per ASME B36.19; custom up to 50mm |
| Length | Single random, double random, or cut-to-length |
| Pipe End | Plain End (PE) / Beveled End (BE) / Threaded |
| Welding Process | Automatic welding, no filler metal added |
| Heat Treatment | Solution annealed at 1025-1125°C + quench (mandatory) |
| Inspection | Hydrostatic Test / Eddy Current or UT / Tension Test / Flattening Test / ASTM A923 Intermetallic Test (Method A, B, or C) |
| Recommended Filler Metal | ER2594 (for welded pipe applications with added filler) |
| Documents | MTC 3.1 / Inspection Reports / Packing List / Heat Number Traceability |
ASTM A790 S32750 super duplex welded pipe is specified for the most demanding corrosive environments where duplex 2205 (S32205) is insufficient. The PREN 42+ chemistry provides critical pitting temperature of ~65°C in 6% FeCl3, compared to ~35°C for 2205.
Typical applications include:
- Offshore topside and subsea piping systems (manifolds, trees, flowlines)
- Seawater handling systems at elevated temperatures (>20°C)
- High-chloride produced water (>50,000 ppm Cl-) at temperatures above 80°C
- Desalination plant high-pressure piping and seawater intake/brine systems
- Chemical processing with aggressive chlorides and acids
- Sour service per NACE MR0175 / ISO 15156
- Umbilical and control system tubing in subsea applications
- Heat exchangers in tropical marine environments
Key selection considerations: S32750 is specified when the environment exceeds duplex 2205 capabilities—direct seawater service, high-chloride produced water, subsea components, and sour service applications. The autogenous welding without filler metal is a key requirement of ASTM A790—for welded pipe with filler metal, ASTM A928 applies instead. Solution annealing and quenching are mandatory to prevent detrimental intermetallic phases (sigma, chi) that severely degrade toughness and corrosion resistance. The ASTM A923 intermetallic test is critical—many EPC specifications require Method C (ferric chloride corrosion test), the most stringent. Super duplex 2507 has about 22% higher yield strength than 2205 (550 vs 450 MPa), allowing thinner wall sections. The maximum service temperature is approximately 315°C; prolonged use above 570°C reduces toughness. Filler metal recommended for welding is ER2594.
Shangyou Stainless Steel provides value-added processing including custom cutting, beveling, and end protection for super duplex welded pipes. Welding requires strict heat input control (0.5-2.0 kJ/mm) and nitrogen-supplemented shielding gas to maintain the austenite-ferrite balance in the weld zone.
All pipes are packed with export-standard protection including protective end caps, steel strapping, waterproof wrapping, and wooden pallets or steel frames.
Quality documents include MTC 3.1, inspection reports, packing list, and heat number traceability. Third-party inspection (SGS, TUV, BV) can be arranged upon request.
1. What is ASTM A790 S32750?
ASTM A790 S32750 is a super duplex (ferritic/austenitic) stainless steel pipe grade with 25% chromium, high molybdenum, and high nitrogen, offering PREN 42+ and 550 MPa minimum yield strength.
2. What is the UNS number for 2507?
UNS S32750.
3. What is the EN equivalent?
EN 1.4410 (X2CrNiMoN25-7-4).
4. What is the difference between S32205 (2205) and S32750 (2507)?
S32750 has higher Cr (24-26% vs 22-23%), Mo (3-5% vs 3-3.5%), and N (0.24-0.32% vs 0.14-0.20%), delivering PREN 42+ vs ~35 and 550 MPa vs 450 MPa yield. Super duplex is specified for more aggressive chloride environments.
5. What mechanical properties does S32750 have?
Tensile ≥795 MPa, Yield ≥550 MPa, Elongation ≥15%, Hardness ≤310 HBW.
6. Is filler metal used in welding A790 pipe?
No. ASTM A790 requires automatic welding without the addition of filler metal.
7. Is heat treatment required for S32750?
Yes, solution annealing at 1025-1125°C followed by water quench is mandatory.
8. What is the PREN of S32750?
≥42.
9. What is the ASTM A923 test?
It detects detrimental intermetallic phases (sigma, chi) from improper heat treatment. Method C (ferric chloride corrosion test) is the most stringent.
10. What temperature range is S32750 suitable for?
Maximum service temperature ~315°C; prolonged use above 570°C reduces toughness.
11. What are typical applications for S32750 pipe?
Offshore/subsea piping, seawater systems, desalination, high-chloride chemical processing, and sour service.
12. What filler metal is recommended for super duplex welding?
ER2594.
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