Products Description
Product Specifications
| Standards | |
| Steel Grades | |
| Equivalent Standards | |
| Outer Diameter (OD) | 3 mm – 630 mm |
| Wall Thickness (WT) | 0.5 mm – 55 mm |
| Length | 6/9/12m, customized |
| Surface Treatment | |
| Production Process | Cold drawn / cold rolled |
| Condition |
UNS S32750 has a PREN value above 42, providing excellent resistance to pitting and crevice corrosion in chloride-containing environments; it withstands exposure to high-chloride seawater spray, wave action, and H₂S/CO₂ acidic media found in oil and gas applications.
Manufactured via a cold-drawing process, ASTM A815 UNS S32750 duplex stainless steel tube exhibits ultra-high mechanical strength and maintains good impact toughness at cryogenic temperatures below -50°C, making it suitable for low-temperature operating conditions on offshore platforms.
Customized Services
- TORICH offers customizable end configurations-including plain, V-bevel, U-bevel, threaded, and integrated flange ends-compatible with various installation methods such as flat welding, flange connections, and quick-connect fittings.
- We also customize specialized fittings in the same material, including bends, tees, reducers, caps, and nipples.
- We accommodate a full range of pipe diameters compliant with Chinese (GB), American (ASTM/ANSI), and European (EN/DIN) standards, and can manufacture special seamless pipes with extra-large or ultra-fine diameters, as well as ultra-thin or ultra-thick walls.
- Surface treatment services-such as pickling and passivation, electropolishing (Ra ≤ 0.3 μm), and sandblasting-are available based on specific application requirements.
Chemical Composition
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | N |
|---|---|---|---|---|---|---|---|---|---|
| UNS S32750 | ≤0.030 | ≤0.80 | ≤1.20 | ≤0.035 | ≤0.020 | 24.0–26.0 | 6.0–8.0 | 3.0–5.0 | 0.24–0.32 |
Mechanical Properties
| Property | Tensile Strength | Yield Strength (0.2%) | Elongation | Hardness | Structure |
|---|---|---|---|---|---|
| UNS S32750 | ≥795 MPa | ≥550 MPa | ≥15% | ≤32 HRC | Austenitic-Ferritic Duplex |
Possible Alternative Grades
- 2205 duplex stainless steel (UNS S31803/S32205) is a common material for firewater and ballast water systems on offshore platforms; however, its performance under high-temperature, high-chloride conditions is inferior to that of S32750, and it has limited tolerance for H₂S environments.
- UNS S32760 (F55) is the closest alternative grade to S32750, also boasting a PREN value exceeding 40. S32760 has a minimum yield strength of 550 MPa and a tensile strength of ≥750 MPa; the two grades are interchangeable in most offshore applications.
- 254SMO is a high-molybdenum austenitic stainless steel with resistance to chloride pitting comparable to that of S32750 and excellent resistance to salt spray corrosion. However, due to its limited pressure-bearing capacity, it is suitable only for low-pressure, highly corrosive applications on offshore platforms, such as seawater desalination systems, atmospheric-pressure cooling pipelines, and auxiliary anti-corrosion systems.
application areas
- Offshore Oil & Gas Platforms: Process piping, high-pressure injection lines, and wellhead piping systems
- FPSO/FSO Systems: Process piping, seawater systems, and fire-fighting systems for Floating Production, Storage, and Offloading (FPSO) or Floating Storage and Offloading (FSO) units
- Subsea Pipelines and Manifolds: Subsea production lines, injection lines, and manifold systems
- Seawater Cooling and Fire-fighting Systems: Seawater cooling piping and fire-water piping networks
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Polishing equipment
Cold drawing equipment
Products Package
FAQ
Q: What is the maximum operating temperature for S32750 seamless pipes?
A: It is recommended that the continuous operating temperature not exceed 250°C. Prolonged exposure to temperatures above 600°F (316°C) can reduce the material's toughness and corrosion resistance.
Q: What are the main differences between S32750 and 2205 duplex stainless steel?
A: S32750 has higher chromium, molybdenum, and nitrogen content than 2205; its PREN value increases from approximately 35 (for 2205) to over 42, and its yield strength rises from 450 MPa to 550 MPa. S32750 is suitable for more severe corrosive environments, though its cost is approximately 1.3 to 1.8 times that of 2205.
Q: Can non-standard sizes be customized?
A: Yes. We support non-standard customization for pipe diameters ranging from 6 to 2500 mm and wall thicknesses from 0.3 to 50 mm. We offer welded pipes, as well as services such as cut-to-length (up to 18 m) and end processing (beveling, threading, etc.).
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