ASTM A928 Grade 1 S32750 duplex stainless steel welded pipe is a welded pipe compliant with the ASTM A928 specification, manufactured from S32750 (Super Duplex 2507) alloy, featuring exceptional corrosion resistance and high strength. Grade 1 specifies that the pipe is double-welded with filler metal and undergoes full radiographic inspection to ensure weld integrity, making it suitable for high-demand applications such as offshore platforms, seawater systems, and chemical processing.
GNEE provides ASTM A928 S32750 duplex stainless steel welded pipes with standard outer diameters ranging from 1/2 inch to 24 inches (or DN15–DN600), wall thicknesses from 1.6–25.4 mm, manufactured via arc welding processes and optimized for microstructural stability through post-weld heat treatment (e.g., annealing at 1020–1100°C). The pipes are available with pickled, polished, or rolled surface finishes, with multiple specifications stocked as ready inventory, and offered at factory-direct pricing along with complete certification documentation (including material test certificates and third-party inspection reports).
ASTM A928 Class 1 S32750 Duplex Stainless Steel Pipe Manufacturing Process
Electric Fusion Welding (EFW): The electric arc welding process using filler metal ensures that the properties of the weld seam are consistent with those of the base metal.
Solution treatment: After welding, water quenching should be carried out at 1050-1150 ℃ to eliminate residual stress and balance the dual phase structure.
Non destructive testing: 100% radiographic testing (RT) or ultrasonic testing (UT) to ensure that the weld is defect free.
ASTM A928 S32750 Duplex Stainless Steel Pipe Dimensions and tolerances
Outer diameter: typically ranging from 1/2 "to 24" (12.7-610 mm).
Wall thickness: According to ASME B36.19M standard, the allowable tolerance is ± 10%.
Length: Random length or cut to length.
ASTM A928 Class 1 S32750 Duplex Stainless Steel Chemical Composition
|
UNS GRA. |
ASTM A928 Class 1 S32750 DUPLEX STEEL CHEMICAL COMPOSITION % MAXIMUM | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| C | MN | P | S | SI | CR | NI | MO | CU | N | |
| S32202 | 0.03 | 2.0 | 0.040 | 0.01 | 1.0 | 21.5-24.0 | 1.0-2.8 | 0.45 | --- | 0.18-0.26 |
| S32750 | 0.03 | 1.2 | 0.035 | 0.02 | 0.8 | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.5 | 0.24-0.32 |
ASTM A928 S32750 Duplex Stainless Steel Pipe Mechanical Properties
| GRADE | Tensile Strength, min ksi [MPa] | Yield Strength, min ksi [MPa] |
|---|---|---|
| S32750 | 116 [800] | 80 [550] |
ASTM A928 Class 1 S32750 Duplex Stainless Steel Pipe Application
Oil and gas: S32750 duplex stainless steel pipe can be used as subsea pipelines and pipelines for transporting high sulfur media.
Chemical industry: S32750 duplex stainless steel pipe can be used as a pipeline for reactors and heat exchangers in strong acid (such as sulfuric acid, hydrochloric acid) and strong alkali environments.
Desalination of seawater: S32750 duplex stainless steel pipe can be applied to high-pressure reverse osmosis (RO) systems and seawater cooling systems.
Packaging and Marking:
Packaged in bales or laminated wooden crates, wrapped in plastic, and appropriately protected to ensure seaworthiness for transport, or as required.
Marking must comply with Specifications A928/A928M and include information on whether the pipe is hot-finished or cold-finished, including but not limited to: standard, grade, size, heat number, and batch number.
