HAOMEI Aluminum CO., LTD.
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Super duplex stainless steel seamless pipe is designed for demanding service conditions where high strength and superior corrosion resistance are required. Compared with standard austenitic stainless steels, super duplex seamless pipe offers better resistance to pitting, crevice corrosion, and chloride stress corrosion cracking, making it an ideal choice for marine, offshore, oil and gas, desalination, and chemical processing applications.
Manufactured without a welded seam, this product is suitable for high-pressure and critical service systems where reliability, dimensional accuracy, and material integrity are essential.
Specifications of Super Duplex Stainless Steel Seamless Pipe:
Product Name | Super Duplex Stainless Steel Seamless Pipe |
Material Grades | UNS S32750 / UNS S32760 |
Manufacturing Type | Seamless |
Standards | ASTM A790, ASTM A789, EN standards available upon request |
Size Range | According to customer requirement |
Outer Diameter | 6 mm – 610 mm |
Wall Thickness | 1 mm – 40 mm |
Length | up to 12 m |
End Type | Plain end / Beveled end |
Surface Finish | Annealed and pickled |
Inspection Documents | EN 10204 3.1 / other documents upon request |
Grades of Super Duplex Seamless Pipe:
UNS S32750
UNS S32760 (if available)
The most common commercial grade is Super Duplex 2507 (UNS S32750), which combines high mechanical strength with excellent corrosion resistance in chloride-containing environments.
Super Duplex stainless steel is characterized by a balanced microstructure of austenite and ferrite, providing both high strength and excellent corrosion resistance.
Typical properties include:
High yield strength
Excellent chloride corrosion resistance
Good toughness
Improved resistance to stress corrosion cracking
Chemical Composition of Super Duplex Stainless Steel 2507:
Element | Content (%) |
Carbon (C) | Max 0.030 |
Chromium (Cr) | 24.0 – 26.0 |
Nickel (Ni) | 6.0 – 8.0 |
Molybdenum (Mo) | 3.0 – 5.0 |
Nitrogen (N) | 0.24 – 0.32 |
Manganese (Mn) | Max 1.20 |
Silicon (Si) | Max 0.80 |
Phosphorus (P) | Max 0.035 |
Sulfur (S) | Max 0.020 |
Copper (Cu) | Max 0.50 |
Mechanical Properties:
Property | Value |
Tensile Strength | ≥ 800 MPa |
Yield Strength (0.2% Offset) | ≥ 550 MPa |
Elongation | ≥ 15% |
Hardness | Max 310 HB |
Impact Toughness | Available upon request / according to standard |
Standards of Super Duplex Stainless Steel Seamless Pipe:
Common standards for Super Duplex Stainless Steel Seamless Pipe include:
ASTM A790 – Seamless and welded ferritic/austenitic stainless steel pipe
ASTM A789 – Seamless and welded ferritic/austenitic stainless steel tubing
EN 10216-5 – Seamless steel tubes for pressure purposes
Available standards may vary depending on size, grade, and project specification.
Features & Benefits of Super Duplex Stainless Steel Seamless Pipe:
Excellent resistance to pitting and crevice corrosion
High resistance to chloride stress corrosion cracking
Higher strength than 304, 316L, and duplex 2205
Suitable for seawater, offshore, and aggressive chemical environments
Good performance in high-pressure systems
Long service life with reduced maintenance cost
Seamless construction for critical applications
Applications of Super Duplex Stainless Steel Seamless Pipe:
Super Duplex Stainless Steel Seamless Pipe is widely used in:
Marine piping systems
Seawater handling systems
Offshore platforms
Oil and gas transmission
Heat exchangers
Desalination plants
Chemical processing plants
Pressure piping systems
Fire water and cooling water systems
Corrosion-sensitive industrial applications
Super duplex seamless pipe is often selected when standard stainless steel grades such as 316L are not sufficient for chloride-rich or highly corrosive conditions. Its high strength allows for thinner wall design in some applications, while its superior corrosion resistance helps improve service life and reduce maintenance costs.
For marine and offshore industries, super duplex pipe is a reliable solution for systems exposed to seawater, salt spray, and aggressive service media.
Quality Control & Certificates of Super Duplex Stainless Steel Seamless Pipe:
To ensure reliable performance, Super Duplex Stainless Steel Seamless Pipe can be supplied with strict quality control and inspection procedures, including:
Raw material verification
Chemical composition analysis
Mechanical property testing
PMI (Positive Material Identification)
Hydrostatic test
Dimensional inspection
Surface inspection
Non-destructive testing upon request
Available documents may include:
EN 10204 3.1 Mill Test Certificate
Chemical composition report
Mechanical test report
PMI report
Third-party inspection report upon request
If project-specific certification is required, please contact us before ordering.
Packaging of Super Duplex Stainless Steel Seamless Pipe:
The pipes are packed to ensure protection during storage and export transportation.
Common packing methods include:
Bundles with protective wrapping
Wooden cases or wooden boxes
End caps for pipe protection
Marking according to customer requirements
FAQ:
Super duplex stainless steel seamless pipe is a high-strength, corrosion-resistant stainless steel pipe made without a welded seam. It is commonly used in marine, offshore, and seawater applications.
Yes. Super duplex pipe offers excellent resistance to pitting, crevice corrosion, and chloride stress corrosion cracking, making it suitable for seawater systems.
2205 is a duplex stainless steel grade for general corrosion-resistant service, while 2507 is a super duplex grade with higher strength and better corrosion resistance in aggressive chloride environments.
Common standards include ASTM A790, ASTM A928, ASTM A999, and EN 10216-5, depending on project and application requirements
Typical certificates include MTC, EN 10204 3.1 / 3.2, PMI reports, chemical and mechanical test reports, hydro test reports, and third-party inspection documents.
Please provide the material grade, standard, outside diameter, wall thickness, length, quantity, application, certificate requirements, and destination port.
