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The Duplex Steel Seamless Pipe is a premium engineering material celebrated for its unique microstructural composition, blending austenitic and ferritic phases to create a robust, high-performance solution for challenging environments. This pipe type is manufactured through a seamless process, ensuring a homogenous structure free from welding defects, which is critical for maintaining consistent mechanical and corrosion-resistant properties across the entire length.
Enhanced Mechanical Properties: With a minimum yield strength of 450 MPa (depending on grade), duplex steel pipes offer superior tensile strength compared to standard stainless steels, making them suitable for high-pressure applications. Their ductile nature also allows for deformation without brittle failure, enhancing safety in dynamic loading conditions.
Tailored Corrosion Resistance: The balanced phase structure provides excellent resistance to a wide range of corrosive media, including chloride ions, which are notorious for causing SCC in conventional steels. Grades like 2205 excel in moderate chloride environments, while super duplex grades like 2507 handle highly aggressive chloride-laden fluids, such as those found in desalination plants.
Thermal and Fatigue Resistance: These pipes maintain their mechanical properties at elevated temperatures up to 300°C and exhibit good resistance to thermal cycling, making them suitable for applications involving frequent temperature fluctuations, such as heat exchangers and coker units in refineries.
Precision Manufacturing: The seamless production process ensures tight dimensional tolerances, smooth internal surfaces to reduce fluid friction, and consistent wall thickness, meeting the strictest quality standards for critical applications.
Duplex steel seamless pipes are indispensable in industries where both strength and corrosion resistance are non-negotiable. In the marine sector, they are used for seawater intake systems, ship hull structures, and offshore rig components exposed to relentless saltwater corrosion. The chemical and petrochemical industries rely on these pipes for transporting aggressive chemicals, such as sulfuric acid and sodium hypochlorite, in refineries and petrochemical plants. Additionally, they are employed in the food and beverage industry for hygienic pipelines requiring resistance to cleaning agents, and in the renewable energy sector for geothermal systems and solar thermal plants, where harsh fluids and high pressures are common.
Our pipe factory has 296 employees ,including 4 senior engineers,18 engineers and 38 professional technicians.
We can produces 30,000tons of austenitic steel and duplex steel pipes annually with 18 seamless production lines and 3 perforation production lines.
Our pipe factory has been certified to the ISO9001:2015 quality management system and certified by various classification societies (such as BV, ABS,CCS,DNV/GL,TUV,LR,KR etc).
Chemical Composition | ||||||||||
Grade | C | Si | Mn | P | S | Cr | Ni | Mo | N | Cu |
Max | Max | Max | Max | Max | Max | Max | ||||
S32205 | 0.03 | 1.00 | 2.00 | 0.03 | 0.02 | 22.0-23.0 | 4.5-6.5 | 3.0-3.5 | 0.14-0.20 | 0.50 |
S31803 | 0.03 | 1.00 | 2.00 | 0.03 | 0.02 | 21.0-23.0 | 4.5-6.5 | 3.0-3.5 | 0.14-0.20 | 0.50 |
S32750 | 0.03 | 0.80 | 1.20 | 0.035 | 0.02 | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.24-0.32 | 0.50 |
Mechanical Properties | |||||||
Grade | Density | Temperature | Coefficient Of Thermal Expansion | Annealing Temperature | Tensile Strength | Yield Strength | Elongation |
g/cm | ℃ | mm/m℃ | ℃ | >nPm(Mpa)Min | Rp0.2(>Mpa)Min | Min% | |
S32205 | 7.8 | 20-100 | 13.7 | 1025-1100 | 655 | 485 | 25 |
S31803 | 7.8 | 20-100 | 13.7 | 1025-1100 | 655 | 485 | 25 |
S32750 | 7.8 | 20-100 | 11.5 | 1025-1125 | 800 | 50 | 15 |
Specifications Of Duplex Steel Seamless Pipe |
OD: 6mm-325mm
WALL THICKNESS: 0.5mm-20mm
Max Length:12m (Special specifications are available as required)
STANDARD: ASTM A789,ASTM A790
Material: S31500, S32101, S32003, S32304, S31803, S32205, S32750, S32760
Production Processes |
Duplex steel has a mixed microstructure of austenite and ferrite, combining the advantages of ferritic and austenitic steels. Its seamless pipe is manufactured through a seamless process, free from welding defects, with uniform structure, superior mechanical properties and corrosion resistance.
Our main grades include S31500, S32101, S32003, S32304, S31803, S32205, S32750, S32760, meeting ASTM A789 and ASTM A790 standards.
They feature enhanced mechanical properties (min. yield strength ≥450MPa), excellent chloride stress corrosion cracking resistance, good thermal and fatigue resistance up to 300°C, and precise dimensional control.
They are widely used in marine, chemical & petrochemical, food & beverage, and renewable energy industries, especially for seawater systems, corrosive fluid transportation, and high-pressure applications.
Outer Diameter: 6mm–325mm; Wall Thickness: 0.5mm–20mm; Max Length: 12m; special specifications can be customized as required.
