ASTM A928 UNS S32750 Super Duplex EFW Welded Pipe
Jan 15, 2026
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What is the ASTM A928 standard?
ASTM A928 is a standard developed by the American Society for Testing and Materials (ASTM) for electric fusion welded (EFW) duplex stainless steel pipes (ferritic/austenitic), specifically for use in corrosive environments. This standard requires the addition of filler metal during the welding process, which distinguishes it from the seamless/welded pipe standard ASTM A790, which does not require the addition of filler metal.
The ASTM A928 Grade 1 S32750 super duplex stainless steel welded pipe we offer is an electric fusion welded (EFW) pipe made from S32750 grade super duplex stainless steel. "Grade 1" indicates that the pipe is double-welded with filler metal, with welding performed on all weld passes, followed by comprehensive radiographic testing to ensure weld integrity. It is suitable for demanding applications in industries such as offshore oil and gas, power generation, and chemical processing.
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 |
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% |
What is the difference between ASTM A790 and ASTM A928?
ASTM A790 specifies the elements and requirements for the manufacture of seamless and welded pipes, while ASTM A928 covers only electric fusion welded pipes. ASTM A790 requires that duplex and super duplex steel pipes be welded without the addition of any filler metal.
Application
Chemical Processing Plants
Refinery and Petrochemical Industries
Desalination Plants
Marine Applications
Power Generation
Water Treatment Facilities
Pharmaceutical Industry
Food Processing
Heat-treatment Option of A928 S32750 electric welding pipe
+NT: Normalized and tempered
+A: Annealed (full/soft/spheroidizing)
+N: Normalized
+P: Precipitation hardened
+QT: Quenched and tempered (water/oil)
+AT: Solution annealed
Refer sizes and price list of ASTM A928M S32750 EFW pipe
If you have project requirements for UNS S32750 stainless steel pipes, we welcome your order. GNEE has a large inventory of popular products for you to choose from. Available in both seamless and welded forms, please contact our factory immediately for detailed chemical composition information and free samples. We offer competitive prices and excellent service.
The pipes are packaged with waterproof paper and steel straps, meeting standard export sea freight packaging requirements, suitable for various transportation methods, or customized according to customer requirements.Email: sales@gneestainless.com
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