ASTM A790 Grade UNS S32760 duplex stainless steel pipe is a high-performance super duplex stainless steel pipe designed for extreme corrosion and high-strength applications. This grade features a balanced ferritic-austenitic microstructure (approximately 40–50% ferrite / 50–60% austenite) with added tungsten and copper, which further enhance its resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) in aggressive environments. UNS S32760 is available in seamless and welded constructions, offering superior performance compared to standard duplex grades like S31803 and S32205.
Key Features:
1) Superior corrosion resistance, PREN (Pitting Resistance Equivalent Number) typically ≥ 40, significantly higher than standard duplex grades
2) Minimum yield strength ≥ 550 MPa (80 ksi) – approximately 2.5 times that of 316L
3) Outstanding resistance to stress corrosion cracking (SCC)
4) Suitable for high-pressure and high-chloride applications
ASTM A790 Gr. UNS S32760 Chemical Composition & Mechanical Property:
Chemical Composition, max, % |
Chemical Composition, % | UNS S31803 | UNS S32205 | UNS S32750 | UNS S32760 |
C, max | 0.030 | 0.030 | 0.030 | 0.030 |
Mn, max | 2.00 | 2.00 | 1.20 | 1.00 |
P, max | 0.030 | 0.030 | 0.035 | 0.030 |
S, max | 0.020 | 0.020 | 0.020 | 0.010 |
Si, max | 1.00 | 1.00 | 0.80 | 1.00 |
Ni | 4.5-6.5 | 4.5-6.5 | 6.0-8.0 | 6.0-8.0 |
Cr | 21.0-23.0 | 22.0-23.0 | 24.0-26.0 | 24.0-26.0 |
Mo | 2.5-3.5 | 3.0-3.5 | 3.0-5.0 | 3.0-4.0 |
N | 0.08-0.20 | 0.14-0.20 | 0.24-0.32 | 0.20-0.30 |
Cu | / | / | 0.5 | 0.50-1.00 |
W | / | / | | 0.50-1.00 |
Tensile Requirements | UNS S31803 | UNS S32205 | UNS S32750 | UNS S32760 |
Yield Strength (min)
MPa (psi) | 450 (65,300) | 450 (65,300) | 550 (79,800) | 550 (79,800) |
Tensile Strength (min)
MPa (psi) | 620 (89,900) | 655 (95,000) | 800 (116,000) | 750 (108,800) |
General information:
Standard: ASTM A790
Grade: UNS S32760
Size: OD: 21.3-914mm; WT: Schedule 10, 40, STD, XS, to XXS; L: SRL / DRL / Cut to length
Ends:
1) Beveled ends
2) Plain ends
3) Threaded ends
Available Finishing: solution annealed & pickled (AP); pickled & passivated (P&P); oiled
Package: Hexagonal bundled with steel strips for small or medium sizes, loose packing for large diameter pipes, plastic caps on both ends, waterproof material wrapped, wooden cases or crates for small sizes or special requirements
Shipment: Land transportation by truck or train, sea transportation by container shipment or bulk vessel.
Hebei K-Steel Pipe Industry Our advantage:
Flexible Project Customization
We provide tailored manufacturing solutions to meet diverse project requirements, including customized outer diameter, wall thickness, and length specifications. In addition, we offer precision end preparation and a full range of anti-corrosion coating options to ensure optimal performance in various operating environments. This flexibility enables us to deliver line pipe solutions that align seamlessly with your technical and application needs.
Fast & Reliable Lead Time
With strong mill partnerships and readily available inventory resources, we are able to shorten production cycles and respond quickly to urgent project demands. Our integrated supply network ensures stable material availability, efficient scheduling, and on-time delivery — helping clients keep their projects on track without delay.
Advanced Technical & Quality Assurance
Equipped with our own metallurgical laboratories and supported by trusted third-party inspection agencies, we ensure every line pipe meets international standards and project specifications. Comprehensive testing and verification guarantee consistent mechanical properties, chemical composition, and coating integrity, providing clients with reliable, high-quality pipeline solutions.
Rapid Delivery & Complete Logistics
Leveraging fast supply capabilities and a well-established logistics network, we ensure timely delivery of line pipes to any project location. Our streamlined transportation and warehousing system minimize lead time, helping clients maintain smooth operations and meet critical project schedules.
