Products Description
Product Specifications
| Standards | ASTM A928 / A928M |
| Steel Grades | UNS S32750 / 2507 |
| Equivalent Grades | EN 1.4410;X2CrNiMoN25-7-4;DIN 1.4410;SAF 2507;UR 2507 |
| Outer Diameter (OD) | 8 mm - 1800 mm |
| Wall Thickness (WT) | 1 mm - 60 mm |
| Length | 6/12m, or customized |
| Surface Treatment | Pickled & passivated; polished finish available |
| Production Process | EFW |
| Condition | Solution annealed and pickled/passivated |
UNS S32750 has a PREN value of ≥40, offering superior corrosion resistance compared to conventional stainless steels; it maintains excellent resistance to pitting corrosion at 60°C in media containing 70,000 ppm chloride, thereby meeting the corrosion resistance requirements for ultra-deepwater oil and gas extraction.
Compared to standard duplex stainless steel 2205, S32750 exhibits significantly improved resistance to stress corrosion cracking in H₂S-containing sour environments and can withstand complex corrosive conditions characterized by high H₂S and CO₂ partial pressures and high chloride concentrations. ASTM A928 UNS S32750 tubing complies with NACE MR0175/ISO 15156 standards and is suitable for use in production tubing and casing for sour gas wells.
Customized Services
- Customized Dimensions: Non-standard outer diameters and wall thicknesses can be customized to meet specific design requirements; outer diameters range from 8 mm to 1800 mm, and wall thicknesses from 1 mm to 60 mm.
- Surface Treatment: Options include pickling and passivation, internal surface polishing (roughness ≤ Ra 0.4 μm), and external surface sandblasting.
- Customized Pipe End Processing: Plain End (PE), Beveled End (BE), and Threaded End; bevel angles can be machined according to ASME B16.25 standards or specific customer requirements.
Chemical Composition
| Element | C (%) | Mn (%) | Si (%) | P (%) | S (%) | Cr (%) | Ni (%) | Mo (%) | N (%) | Fe (%) |
|---|---|---|---|---|---|---|---|---|---|---|
| UNS S32750 | ≤ 0.03 | ≤ 1.20 | ≤ 0.80 | ≤ 0.035 | ≤ 0.020 | 24.0 – 26.0 | 6.0 – 8.0 | 3.0 – 5.0 | 0.24 – 0.32 | Balance |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB/ HRC) | Impact Energy (J, RT) |
| UNS S32750 | ≥ 800 (116 ksi) | ≥ 550 (80 ksi) | ≥ 25 | ≤ 310 HB / ≤ 32 HRC | ≥ 60 |
Possible Alternative Grades
- For operating conditions characterized by low chloride ion concentrations, moderate temperatures (<60°C), and limited H₂S content, 2205 duplex stainless steel is a suitable choice, offering lower costs than 2507.
- For applications such as acidic chemical injection lines in oil and gas production-where high-chloride conditions are not present-904L super austenitic stainless steel is a viable option; it performs exceptionally well in reducing acid environments, such as those involving sulfuric or phosphoric acid.
- 254SMO super austenitic stainless steel offers pitting corrosion resistance comparable to or even slightly better than that of S32750; it is well-suited for applications with restricted welding conditions, as its weldability is superior to that of 2507.
application areas
- Downhole equipment: downhole production tubing and casing, liners and tie-back strings, downhole instrumentation tubing and control lines, etc.
- Surface oil and gas facilities: wellhead equipment and Christmas tree piping, oil and gas gathering and transportation pipelines, process piping for natural gas processing units, etc.
- Offshore engineering: offshore platform fire-fighting and ballast water systems, FPSO seawater cooling lines, seawater heat exchanger tube bundles, etc.
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: Can S32750 welded pipe be used in sour gas environments containing H₂S?
A: Yes. S32750 complies with NACE MR0175/ISO 15156 standards and is suitable for sour gas environments containing H₂S. Its resistance to H₂S stress corrosion cracking exceeds that of standard duplex stainless steel 2205.
Q: What is the maximum service temperature for S32750 welded pipe?
A: The maximum recommended service temperature for S32750 is 300°C. Exceeding this temperature poses a risk of sigma (σ) phase precipitation and 475°C embrittlement, leading to a significant reduction in toughness and corrosion resistance.
Q: Can the weld seam strength match that of the base metal?
A: Yes. When ASTM A928 UNS S32750 pipe is welded strictly in accordance with ASTM A928 requirements using filler metal (ER2594 is recommended), the Class 1 designation mandates 100% radiographic testing of the weld quality.
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