What is ASTM A928 material?
ASTM A928 is a standard specification for electric-fusion-welded (EFW) ferritic/austenitic (duplex) stainless steel pipes, intended for high-temperature and highly corrosive service. It covers various grades, such as UNS S31803 and S32750, with added filler metal, making it suitable for industries like oil and gas, chemical processing, and petrochemicals.
ASTM A928 UNS S32750 EFW Pipe Supplier
ASTM A928 UNS S32750 EFW (Electric Fusion Welded) pipe is a super duplex stainless steel welded pipe specifically designed for extreme corrosive environments. It features a duplex microstructure with approximately 25% chromium, 7% nickel, 4% molybdenum, and 0.3% nitrogen, combining high strength with excellent corrosion resistance. The material offers a minimum yield strength of 550 MPa, a minimum tensile strength of 795 MPa, and a hardness limit of 310 HBW or 32 HRC. It is widely used in seawater, desalination, and chemical processing environments.
Our 2507 stainless steel EFW pipes are manufactured using double-sided welding with filler metal. The use of filler metal helps better control the ferrite/austenite phase balance in the weld seam. Solution annealing is typically required; however, under certain conditions (such as when using pre-annealed base material), heat treatment may be exempted, provided that additional corrosion testing is performed.
GNEE can supply UNS S32750 EFW welded pipes with outside diameters ranging from 1/2" to 24" (12.7–610 mm), wall thickness from 1.6 to 25.4 mm, and lengths up to 6 meters or customized sizes. We mainly provide ASTM A928 Class 1 grade (double welding with filler metal and 100% radiographic inspection), ensuring a weld efficiency of 1.0. We also offer Class 2 to Class 5 grades to meet different project requirements. In addition, we support cutting, beveling, bending, and other advanced processing services.
Classes of ASTM A928 S32750 Duplex Steel Electric Fusion Welded / EFW Pipe
| Class type | Welding | Filler Metal | Radiography Test |
|---|---|---|---|
|
ASTM A928 |
Double welded with filler metal |
Yes | 100% |
|
ASTM A928 |
Double welded with filler metal |
Yes | NA |
|
ASTM A928 |
Single welded with filler metal |
Yes | 100% |
|
ASTM A928 |
Single Welded without addition filler metal |
Without filler (Root pass to be done) | 100% |
|
ASTM A928 |
Double welded with filler metal |
Yes | Spot |
Chemical Composition of A928 S32750 Duplex Steel Electric Fusion Welded / EFW Pipe
| UNS Number Duplex Grades |
Si | Mn | P | Typeb | N | Cu | Other | S | Cr | Ni | C | Mo |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| S32750 | 0.80 | 1.20 | 0.035 | 2507 | 0.24-0.32 | 0.50 | 0.020 | 24.0-26.0 | 6.0-8.0 | 0.030 | 3.0-5.0 |
Tensile & Yield strength of A928 S32750 Duplex Steel Electric Fusion Welded / EFW Pipe
| UNS | Yield Strength | Tensile Strength |
|---|---|---|
|
ASTM A928 UNS S32750 |
80 Ksi 550 Mpa |
116 Ksi 800 Mpa |
Heat treatment of A928 UNS S32750 Duplex Steel Electric Fusion Welded / EFW Pipe
| UNS | Temperature range |
|---|---|
|
ASTM A928 UNS S32750 |
1880-2060 °F 1025-1125 °C |
ASTM A928 S32750 EFW SAW pipe pressure rating
Pressure rating of UNS S32750 pipe As per EN 13480-3 European standard
Dimensions: wall tolerance: ± 10%, OD 6mm x 1mm
| Grade |
Maximum internal pressure, bar |
||||||||
|---|---|---|---|---|---|---|---|---|---|
| 20°C | 50°C | 100°C | 150°C | 200°C | 250°C | 300°C | 350°C | 400°C | |
| 1.4410 (SAF 2507) |
1176 | 1176 | 1129 | 1047 | 988 | 952 | - | - | - |
Tolerance chart of SA 928 UNS S32750 EFW pipe
| Out diameter | Tolerance of pipe end | Tolerance of pipe body |
|
219.1～273.1 |
+1.6mm, -0.4mm | ±0.75% |
| 274.0～320 | +2.4mm, -0.8mm | ±0.75% |
| 323.9～457 | +2.4mm, -0.8mm | ±0.75% |
| 508 | +2.4mm, -0.8mm | ±0.75% |
| 559～610 | +2.4mm, -0.8mm | ±0.75% |
At GNEE, buyers of UNS S30400 pipes can compare dimensions, data sheets, and price lists from renowned 2507 stainless steel pipe manufacturers in China and Europe. Get a free quote today!
A928 UNS S32750 EFW pipe HS Code
| Category | (HS Code) | (Description) |
| outer diameter ≤ 406.4mm | 7306.40.00 | Tubes, pipes and hollow profiles, welded, of circular cross-section, of stainless steel. |
| outer diameter > 406.4mm | 7305.11.00 | Other tubes and pipes, having circular cross-sections, external diameter > 406.4mm, of iron or steel, longitudinally arc welded. |
Why use ASTM A928 instead of A790 for S32750?
ASTM A928 is specifically for EFW (Electric Fusion Welded) pipes with filler metal, typically used for large diameters where seamless pipes are unavailable or too expensive. A790 covers both seamless and automatic welded (usually without filler) pipes.
Quality Control & Testing
| Test Type | Standard/Method |
| Radiographic Test (RT) | ASME BPVC Section V |
| Hydrostatic Test | ASTM A999 |
| Ferrite Content Test | ASTM E562 / FischerScope |
| Corrosion Test | ASTM G48 Method A |
| Microstructure | ASTM E112 |
Packaging and Shipping
Packaging: Each tube is wrapped in moisture-proof paper, lined with plastic film, and secured with steel bands. The outer layer is protected by wooden pallets or wooden crates to ensure safety during international transit.
Marking: Each package includes information regarding the heat number, grade, dimensions, and applicable standards.
Delivery Time: Typically within 7–15 business days after receipt of the advance payment.
