ASTM A928 Class 1 S32750 Duplex Stainless Steel Welded Pipe for Oil and Gas Industry
ASTM A928 is a standard developed by the American Society for Testing and Materials (ASTM), officially known as the "Standard Specification for Ferritic/Austrian (Duplex) Stainless Steel Pipe Electric Fusion Welded with Addition of Filler Metal". This standard covers the manufacturing requirements for duplex stainless steel welded steel pipes and is applicable to corrosive environments such as chemical, marine, oil and gas. S32750 is a grade of duplex stainless steel, corresponding to UNS S32750 (Unified Numbering System), also known as 2507 super duplex stainless steel.
The chemical composition of S32750 duplex stainless steel material is mainly composed of Cr, Ni, Mo, N, and Fe. Among them, Cr can improve the corrosion resistance and oxidation resistance of S32750, Ni can improve the stability and toughness of austenite, Mo helps S32750 resist pitting and crevice corrosion, and N can improve the strength and corrosion resistance of S32750.
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 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 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.
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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.
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Paper making and environmental protection: S32750 duplex stainless steel pipe can be used for bleaching equipment and wastewater treatment systems.
- Energy: S32750 duplex stainless steel pipe can be used for flue gas desulfurization (FGD) devices and auxiliary systems in nuclear power plants.
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