Products Description
Product Specifications
| Standards | ASTM A789/A789M |
| Steel Grades | S32750 (2507) S32760 S32707 S32520 S32550 S32950 S32808 S33207 S39274 S39277 |
| Equivalent Standards |
EN 10216-5,ASTM A790,JIS SUS32750 |
| Outer Diameter (OD) | 5mm-630mm |
| Wall Thickness (WT) | 0.5mm-55mm |
| Length | up to 18m |
| Surface Treatment | Annealed & Pickled (AP), Bright Annealed (BA), Polished |
| Production Process | Cold Rolling / Cold Drawing |
| Condition | Solution Annealed & Water Quenched |
S32750/S32760 material has a PREN value ≥40, far exceeding those of 2205 duplex stainless steel (PREN≈35) and 316L stainless steel (PREN≈26), and exhibits extremely high corrosion resistance and long-term resistance to seawater chloride ions and salt spray corrosion.
Super Duplex Tubing 2507 has a minimum yield strength of 550 MPa and a minimum tensile strength of 795 MPa, more than three times that of 316L stainless steel, thus significantly reducing structural weight and costs in offshore platform applications.
Super duplex stainless steel has a maximum continuous service temperature of 300°C (approximately 572°F), which is higher than the 250°C upper limit of standard duplex stainless steel 2205, and it also possesses good weldability and machinability.
Customized Services
- TORICH offers custom sizing services covering an outer diameter range of 6 mm to 630 mm and a wall thickness range of 0.5 mm to 55 mm. These services meet the standard wall thickness requirements of ANSI/ASME B36.10M and B36.19M, and also support delivery based on either average wall thickness or minimum wall thickness specifications.
- Available surface finishes include: solution annealed and pickled, mechanical polished, bright annealed, 2B finish, brushed finish, mirror polished (8K), and others.
- Customization options for pipe ends include plain ends, bevels, threads, and flanged connections. Pipe ends feature deburring, chamfering, and precision machining of sealing grooves to facilitate on-site welding and rapid installation, ensuring compatibility with standard connection dimensions for offshore pipelines.
- We support custom lengths and the supply of coiled tubing; our coiled products can reach continuous lengths exceeding 10,000 meters, specifically designed to meet the continuous-length requirements of applications such as deep-sea umbilical cables.
Chemical Composition
| Element | Cr | Ni | Mo | N | W | Cu | PREN (Approx.) |
|---|---|---|---|---|---|---|---|
| S32750 | 24–26 | 6–8 | 3–5 | 0.24–0.32 | - | - | 40–45 |
| S32760 | 24–26 | 6–8 | 3–4 | 0.20–0.30 | 0.5–1.0 | 0.5–1.0 | 42–46 |
| S32707 | 25–28 | 6.5–9 | 3–4 | 0.35–0.45 | - | - | 48–50 |
| S32520 | 24–27 | 4–6 | 3–4 | 0.25–0.35 | - | 1.5–2.5 | 40–45 |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength 0.2% (MPa) | Elongation (%) | Hardness (HB) |
| S32750 | ≥ 795 | ≥ 550 | ≥ 25 | ≤ 310 |
| S32760 | ≥ 750 | ≥ 550 | ≥ 25 | ≤ 310 |
| S32707 | ≥ 850 | ≥ 550 | ≥ 25 | ≤ 310 |
| S32520 | ≥ 760 | ≥ 550 | ≥ 25 | ≤ 310 |
Possible Alternative Grades
- For service conditions involving low chloride concentrations and moderate operating temperatures (typically <80°C), Grade 2205 (UNS S31803/S32205) is a suitable choice; it offers lower costs and superior weldability compared to Grade 2507.
- In mildly corrosive environments-specifically those devoid of chloride ions or containing only trace amounts-the most cost-effective option, 316L stainless steel, may be considered.
- For extreme scenarios characterized by exceptionally high temperatures and high chloride concentrations, 254SMO is a viable option; while it boasts excellent corrosion resistance, its mechanical strength is significantly lower than that of super duplex stainless steels, and its cost is higher.
application areas
Our ASTM A789 Super Duplex Tubing is widely utilized in critical systems within the offshore oil and gas sector, specifically including:
- Subsea Production Systems: Umbilicals, subsea manifolds and valve piping, Christmas tree control lines, etc.
- Offshore Platforms and FPSOs: Topsides process piping, chemical injection lines, instrument air tubing, and hydraulic control lines.
- Critical Auxiliary Systems: Heat exchanger tubing, seawater cooling system piping, offshore platform potable water and utility lines, etc.
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: How does Super Duplex tubing perform in corrosive environments?
A: Super duplex stainless steel tubing conforming to ASTM A789 standards exhibits excellent resistance to chloride corrosion, including resistance to pitting, crevice corrosion, and stress corrosion cracking.
Q: What tests and quality control measures are required for ASTM A789 super duplex steel tubing?
A: TORICH super duplex steel tubing undergoes chemical composition analysis, mechanical property testing, hydrostatic testing, or non-destructive testing.
Q: Can ASTM A789 super duplex steel tubing be customized for specific projects?
A: Customization options include determining outer diameter, wall thickness, and length based on project requirements, specifying pickling and passivation or other surface treatments, and controlling length, straightness, and end preparation.
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