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ASTM A928 S32750 Super Duplex Stainless Steel EFW Pipe Class 1 for Extreme Chloride and Offshore 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 A928 S32750 super duplex stainless steel EFW pipe for global EPC contractors, offshore engineers, chemical processors, and marine fabricators requiring electric-fusion-welded super duplex piping with filler metal addition for the most demanding chloride and corrosive environments. Produced to ASTM A928/A928M, this specification covers electric-fusion-welded ferritic/austenitic (duplex) steel pipe made with addition of filler metal.
ASTM A928 is the standard specification specifically for duplex stainless steel pipe welded with filler metal——a critical distinction from ASTM A790, which requires autogenous welding without filler metal. The addition of filler metal is essential for achieving proper weld chemistry and mechanical properties in thicker-wall and larger-diameter super duplex piping. S32750 (also known as 2507, SAF™ 2507, UNS S32750, 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 40, providing exceptional resistance to chloride pitting, crevice corrosion, and stress corrosion cracking. The specification covers five classes (Class 1 through Class 5) that define welding passes and radiographic examination requirements. Class 1 requires double welding with filler metal in all passes and 100% radiography, making it the standard for critical process piping. Heat treatment shall be performed after welding in accordance with specified temperature and quench conditions.
| Dimension | Specification |
|---|---|
| Product Name | ASTM A928 S32750 Super Duplex Stainless Steel EFW Pipe |
| Product Alias | 2507 EFW Pipe / SAF 2507 Pipe / UNS S32750 Pipe / EN 1.4410 Pipe / Super Duplex Pipe |
| Material Type | Super Duplex Stainless Steel (Ferritic-Austenitic, EFW with Filler Metal) |
| Key Feature | PREN 40+; filler metal added; Class 1/3/5; 25% Cr, 3-5% Mo, N alloyed; 550 MPa yield; extreme chloride resistance |
| 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% / Cu ≤0.50% / Fe Balance |
| Mechanical Properties | Tensile ≥795 MPa (116 ksi) / Yield ≥550 MPa (80 ksi) / Elongation ≥15% |
| Heat Treatment | Solution annealed at 1050-1150°C + water quench |
| PREN | ≥40 |
| Manufacturing Process | Plate Forming → EFW Double/Single Welding with Filler Metal (SAW/GTAW/TIG/Plasma) → Solution Annealing → Sizing → 100% RT/Hydro Testing |
| Recommended Filler Metal | ER2594 (AWS A5.9) |
| Primary Applications | Offshore Platforms / Subsea Piping / Chemical Processing / Desalination / Seawater Systems / Sour Service |
| Parameter | Available Options |
|---|---|
| Product Standard | ASTM A928/A928M, ASME SA-928 |
| UNS Equivalent | UNS S32750 |
| Nominal Pipe Size (NPS) | 1/8″ to 48″ (DN6 to DN1200) |
| Wall Thickness | Schedule 5S, 10S, 40S, 80S, XXS per ASME B36.19; custom up to 32mm |
| Length | Single random (4-7m), double random, or cut-to-length |
| Pipe End | Plain End (PE) / Beveled End (BE) |
| Class Options | Class 1: Double-welded, filler metal all passes, 100% RT; Class 2: Double-welded, no RT; Class 3: Single-welded, 100% RT; Class 4: Single-welded, inside pass without filler, 100% RT; Class 5: Double-welded, spot RT |
| Heat Treatment | Solution annealed at 1050-1150°C + water quench (mandatory) |
| Recommended Filler Metal | ER2594 (AWS A5.9) |
| Inspection | 100% Radiography (Class 1) / Hydrostatic Test / Transverse Tension / Guided-Bend Weld Test / PMI / Flange Test (welded tubes) |
| Documents | MTC 3.1 / Inspection Reports / Packing List / Heat Number Traceability |
ASTM A928 S32750 EFW pipe is specified for large-diameter super duplex piping in the most demanding chloride environments where duplex 2205 (S32205) is insufficient.
Typical applications include:
- Offshore topside and subsea piping systems
- Seawater handling systems at elevated temperatures
- Desalination plant high-pressure piping and brine systems
- Chemical processing with aggressive chlorides and acids
- Sour service per NACE MR0175
- Power generation cooling systems in marine environments
- Pollution control equipment
Key selection considerations: Choose Class 1 for critical process piping requiring maximum weld seam integrity—double-welded with filler metal and 100% radiography. S32750 super duplex is specified when the environment exceeds duplex 2205 capabilities—direct seawater service, high-chloride produced water, and subsea components. The addition of filler metal in ASTM A928 ensures consistent weld properties with the base metal. Recommended filler metal is ER2594. Heat input must be controlled to maintain the 40-60% ferrite balance in the weld zone. Solution annealing at 1050-1150°C is critical to prevent detrimental intermetallic phases (sigma, chi) that severely degrade toughness and corrosion resistance.
Shangyou Stainless Steel provides value-added processing including custom cutting, beveling, and end protection. 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 A928 S32750?
ASTM A928 S32750 is a super duplex stainless steel pipe grade covered under the electric-fusion-welded pipe standard, requiring filler metal addition during welding, with UNS S32750 composition.
2. What is the difference between ASTM A928 and ASTM A790?
ASTM A928 requires filler metal addition during welding; ASTM A790 requires autogenous welding without filler metal.
3. What is the UNS number for 2507?
UNS S32750.
4. What is the EN equivalent?
EN 1.4410 (X2CrNiMoN25-7-4).
5. What mechanical properties does S32750 have?
Tensile ≥795 MPa (116 ksi), Yield ≥550 MPa (80 ksi), Elongation ≥15%.
6. What is Class 1 under ASTM A928?
Class 1 requires double welding with filler metal in all passes and 100% radiography—the highest weld quality level.
7. What are the five classes under ASTM A928?
Class 1: Double-welded, filler metal, 100% RT; Class 2: Double-welded, no RT; Class 3: Single-welded, 100% RT; Class 4: Single-welded, inside pass without filler, 100% RT; Class 5: Double-welded, spot RT.
8. What is the PREN of S32750?
≥40, indicating exceptional pitting resistance.
9. What filler metal is recommended for S32750 welding?
ER2594 (AWS A5.9).
10. What are typical applications for A928 S32750 pipe?
Offshore platforms, subsea piping, desalination, chemical processing, and seawater systems.
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