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ASTM A928 Ferritic/Austenitic Duplex Stainless Steel EFW Pipe S31803/S32205/S32750 Class 1 Double-Welded with Filler Metal
Place of Origin:
China
Brand Name:
Shangyou
Certification:
ISO9001
Minimum Order Quantity:
5Ton
Price:
Based on grade, size, surface, processing, quantity and current raw material market price.
Packaging Details:
Standard seaworthy export packing with bundles, waterproof wrapping, pallets or wooden cases.
Delivery Time:
7-15
Payment Terms:
L/C,D/A,D/P,T/T,Western Union
Supply Ability:
Stock supply, regular production and custom manufacturing available.
Inquiry Now
Get A Quote
Specifications
Product Name:
ASTM A928 Duplex Stainless Steel EFW Pipe
Product Alias:
EFW Duplex Pipe / Filler Metal Welded Duplex / A928 EFW Pipe / 2205 EFW Pipe / 2507 EFW Pipe
Material Type:
Ferritic-Austenitic (Duplex) Stainless Steel (EFW With Filler Metal)
Key Feature:
Electric Fusion Welded With Filler Metal; Five Classes With RT Options; Enhanced Weld Seam Corrosion Resistance; Corrosive Service
Common Grades:
S31803 (2205), S32205 (Improved 2205), S32750 (2507 Super Duplex), S32760, S32304 (2304 Lean Duplex)
Chemical Composition (S32205):
Cr 21.0-23.0% / Ni 4.5-6.5% / Mo 2.5-3.5% / N 0.14-0.20% / C ≤ 0.030% / Fe Balance
Chemical Composition (S32750):
Cr 24.0-26.0% / Ni 6.0-8.0% / Mo 3.0-5.0% / N 0.24-0.32% / C ≤ 0.030% / Fe Balance
Manufacturing Process:
Plate Forming → EFW Welding With Filler Metal (SAW/GTAW) → Heat Treatment → Sizing → RT/Hydro Testing
Product Description
ASTM A928 Ferritic/Austenitic Duplex Stainless Steel EFW Pipe S31803/S32205/S32750 Class 1 Double-Welded with Filler Metal
Shaanxi Shangyou Stainless Steel Co., Ltd. supplies ASTM A928 electric fusion welded (EFW) duplex stainless steel pipe with filler metal for global EPC contractors, oil and gas operators, chemical processors, and marine fabricators requiring high-integrity welded duplex piping with enhanced weld seam corrosion resistance. Produced to ASTM A928/A928M, this specification covers electric-fusion-welded ferritic/austenitic (duplex) steel pipe made with addition of filler metal for corrosive service.
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 enables controlled weld chemistry and microstructure, delivering superior weld seam corrosion resistance and mechanical integrity in highly aggressive environments. The specification includes five classes (Class 1 through Class 5) that define welding passes and radiographic examination requirements. Heat treatment shall be performed after welding in accordance with specified temperature and quench conditions.
Custom Attributes
| Dimension | Specification |
|---|---|
| Product Name | ASTM A928 Duplex Stainless Steel EFW Pipe |
| Product Alias | EFW Duplex Pipe / Filler Metal Welded Duplex / A928 EFW Pipe / 2205 EFW Pipe / 2507 EFW Pipe |
| Material Type | Ferritic-Austenitic (Duplex) Stainless Steel (EFW with Filler Metal) |
| Key Feature | Electric fusion welded with filler metal; five classes with RT options; enhanced weld seam corrosion resistance; corrosive service |
| Common Grades | S31803 (2205), S32205 (Improved 2205), S32750 (2507 Super Duplex), S32760, S32304 (2304 Lean Duplex) |
| Chemical Composition (S32205) | Cr 21.0-23.0% / Ni 4.5-6.5% / Mo 2.5-3.5% / N 0.14-0.20% / C ≤ 0.030% / Fe Balance |
| Chemical Composition (S32750) | Cr 24.0-26.0% / Ni 6.0-8.0% / Mo 3.0-5.0% / N 0.24-0.32% / C ≤ 0.030% / Fe Balance |
| Manufacturing Process | Plate Forming → EFW Welding with Filler Metal (SAW/GTAW) → Heat Treatment → Sizing → RT/Hydro Testing |
| Primary Applications | Oil & Gas / Offshore Platforms / Chemical Processing / Desalination / Marine Environments / Pulp & Paper |
Core Specifications
| Parameter | Available Options |
|---|---|
| Product Standard | ASTM A928/A928M, ASME SA-928 |
| Grade Equivalents | S31803 (2205), S32205 (Improved 2205), S32750 (2507 Super Duplex), S32760, S32304 (2304) |
| Class System | Class 1: Double-welded, filler metal all passes, 100% RT; Class 2: Double-welded, no RT; Class 3: Single-welded, filler metal all passes, 100% RT; Class 4: Single-welded, inside pass may be without filler, 100% RT; Class 5: Double-welded, spot RT |
| Nominal Pipe Size (NPS) | 1/8″ to 48″+ (DN6 to DN1200+) per ASTM A999 |
| Wall Thickness | Per Schedule 5S/10S/40S/80S; custom thickness available |
| Length | Single random, double random, or cut-to-length |
| Pipe End | Plain End (PE) / Beveled End (BE) |
| Welding Process | Electric fusion welding (SAW/GTAW) with filler metal addition |
| Heat Treatment | Solution annealing + quenching per purchaser discretion |
| Inspection | Transverse Tension / Transverse Guided-Bend / Hydrostatic / NDE / Radiography (per Class) |
| Documents | MTC 3.1 / Inspection Reports / Packing List / Heat Number Traceability |
Applications and Material Selection Guide
ASTM A928 duplex EFW pipe is specified for large-diameter corrosive service applications where filler metal addition is required to ensure weld seam integrity and corrosion resistance.
Typical applications include:
- Oil and gas production and refining systems
- Chemical processing plants handling aggressive media
- Offshore platform topsides and subsea piping
- Desalination plants (seawater and brine systems)
- Marine and coastal infrastructure
- Pulp and paper manufacturing equipment
Key selection considerations: Choose ASTM A928 over ASTM A790 when filler metal addition is necessary for weld seam corrosion resistance—this is particularly important for thicker wall pipe (wall thickness > 4mm) and applications requiring enhanced weld integrity. Class 1 (double-welded, 100% RT) is standard for critical process piping in refineries and chemical plants. Class 3 is suitable for single-welded applications with full RT. Class 5 provides a cost-effective spot RT option for less critical service. Select S31803/S32205 for standard 22% Cr duplex service; S32750 for super duplex 25% Cr applications requiring higher strength and PREN.
Processing, Packaging and After-Sales
Shangyou Stainless Steel provides value-added processing including custom cutting, beveling, and end protection for duplex EFW pipes.
All pipes are packed with export-standard protection including protective end caps, steel strapping, waterproof wrapping, and steel frames or wooden pallets.
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.
Frequently Asked Questions
1. What is ASTM A928?
ASTM A928 is the standard specification for electric-fusion-welded ferritic/austenitic (duplex) stainless steel pipe made with addition of filler metal for corrosive service.
2. What is the difference between ASTM A928 and ASTM A790?
ASTM A790 requires autogenous welding without filler metal; ASTM A928 specifically requires filler metal addition during welding. A928 also has five classes with specific RT requirements.
3. What classes are available under ASTM A928?
Class 1: Double-welded, 100% RT; Class 2: Double-welded, no RT; Class 3: Single-welded, 100% RT; Class 4: Single-welded, inside pass may be without filler, 100% RT; Class 5: Double-welded, spot RT.
4. Which ASTM A928 class is most common?
Class 1 (double-welded with 100% RT) is standard for critical process piping.
5. What grades are available under ASTM A928?
S31803 (2205), S32205 (Improved 2205), S32750 (2507 Super Duplex), S32760, and S32304 (2304 Lean Duplex).
6. What is the benefit of filler metal addition?
Filler metal addition enables controlled weld chemistry, enhanced weld seam corrosion resistance, and improved mechanical integrity—particularly important for thicker wall pipes (WT > 4mm).
7. Is heat treatment required for ASTM A928 pipe?
Yes. Heat treatment shall be performed after welding in accordance with specified temperature and quench conditions, at the purchaser's discretion.
8. What size range does ASTM A928 cover?
NPS 1/8″ to 48″+ (DN6 to DN1200+) per ASTM A999.
9. What testing is required for ASTM A928?
Transverse tension test, transverse guided-bend test, hydrostatic or NDE test, and radiographic testing per class requirements.
10. What are typical applications for A928 duplex pipe?
Oil & gas, offshore platforms, chemical processing, desalination, marine, and pulp & paper.
Request a Quote
Need ASTM A928 EFW duplex stainless steel pipe with filler metal for oil & gas, chemical, offshore, or marine applications? Send requirements including grade (S31803/S32205/S32750), class (1/3/5), NPS/WT/length, end finish, quantity, and service conditions.
Shangyou Stainless Steel provides custom sizes, processing, and export solutions for global B2B customers.
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