Products Description
Product Specifications
| Standards | ASTM A790 / ASME SA790 |
| Steel Grades | S31200 S31260 S31500 S31803 S32003 S32101 S32202 S32205 S32304 S32506 S32520 S32550 S32707 S32750 S32760 S32808 S32900 S32906 S32950 S33207 |
| Equivalent Standards | ASTM A789, ASTM A928,EN 10216-5 |
| Outer Diameter (OD) | 6 mm – 1219 mm |
| Wall Thickness (WT) | 0.5 mm – 55 mm |
| Length | Up to 18 m, customized |
| Surface Treatment | Annealed & Pickled |
| Production Process | Hot Extruded, Cold Drawn, Cold Rolled; HFW, LW, SAW. |
| Condition | Solution Annealed |
The tensile strength and yield strength of UNS S32750 S32760 Super Duplex pipe far exceed those of conventional stainless steels such as 316L and 304. With a Pitting Resistance Equivalent Number (PREN) generally ≥ 40, these pipes are ideally suited for environments involving complex chemical media-including those characterized by high chloride concentrations, alternating acidic and alkaline conditions, and reducing acids.
Duplex stainless steel pipes are suitable for an operating temperature range of -50°C to 300°C; they exhibit no intergranular corrosion at high temperatures and remain free from brittle fracture at low temperatures. Consequently, they are well-suited for chemical processes involving alternating hot and cold cycles, the conveyance of cryogenic refrigerants, and high-temperature steam tracing applications.
Customized Services
- TORICH is able to supply custom piping-manufactured in accordance with client drawings-that extends beyond the standard dimensional ranges defined by ANSI B36.19 and B36.10. Our capabilities cover seamless pipes with outer diameters ranging from 6 mm to 1219 mm, and welded pipes from 5.0 mm to 1219 mm.
- We offer customizable end-finishing services, including beveling, plain ends, threading, socket ends, and integral flanging. Furthermore, we support a range of deep processing operations, such as pipe bending, flaring, swaging, hole cutting, and end-cap welding.
Chemical Composition
| Element | C (%) | Cr (%) | Ni (%) | Mo (%) | N (%) | W (%) | Fe (%) |
| UNS S32750 | ≤ 0.03 | 24.0 – 26.0 | 6.0 – 8.0 | 3.0 – 5.0 | 0.24 – 0.32 | – | Balance |
| UNS S32760 | ≤ 0.03 | 24.0 – 26.0 | 6.0 – 8.0 | 3.0 – 4.0 | 0.20 – 0.30 | 0.5 – 1.0 | Balance |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
| UNS S32750 | ≥ 800 | ≥ 550 | ≥ 25 | ≤ 293 |
| UNS S32760 | ≥ 750 | ≥ 550 | ≥ 25 | ≤ 293 |
Possible Alternative Grades
- For moderately corrosive environments-such as those involving low concentrations of chlorides or organic acids-S31803 / S32205 (2205 duplex stainless steel) is a suitable choice. Priced lower than super duplex stainless steels, it is widely utilized in non-critical process piping within chemical processing plants, as well as in water treatment systems.
- For extremely corrosive environments-such as those involving high temperatures, strong acids, or high concentrations of halides-Alloy 625 or Alloy C276 may be selected; however, these options come at a higher cost.
- For auxiliary chemical pipelines operating at ambient temperature and pressure, free of chloride ions, and subject to only mild corrosion, 304 or 316 stainless steel is a viable option. While offering the lowest cost, its service life is less than one-third that of super duplex stainless steel.
application areas
ASTM A790 UNS S32750 / S32760 Super Duplex stainless steel pipes are widely utilized in the following chemical processing applications:
- Pipelines for the conveyance of highly corrosive chemicals (sulfuric acid, hydrochloric acid, hydrofluoric acid, phosphoric acid, and organic acids)
- Chemical reactors and process piping systems
- Applications involving chloride-containing media (e.g., pipelines for brine and salt solution processing)
- Heat exchangers and condensers for acidic media
- High-temperature and high-pressure process piping
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: What is the operating temperature range for Super Duplex steel pipes?
A: Both S32750 and S32760 are suitable for long-term use within the temperature range of -50°C to +300°C. However, they should not be subjected to prolonged use at temperatures exceeding 300°C (570°F), as this can easily lead to material embrittlement and a degradation of corrosion resistance.
Q: What testing and certifications do you provide?
A: We provide 100% hydrostatic testing, eddy current testing (ET), ultrasonic testing (UT), and PMI spectroscopic analysis. Each batch of products is accompanied by an EN 10204 3.1 or 3.2 material certificate.
Q: Do you support the customization of non-standard dimensions and special surface treatments?
A: We offer customization for any non-standard outer diameters, wall thicknesses, and fixed lengths. Additionally, we provide various surface treatment options, including pickling and passivation, internal and external mirror polishing, and bright annealing.
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