ASTM A790 Duplex 2205 Pipe

 

ASTM A790 Duplex 2205 Pipe is a high-performance duplex stainless steel pipe manufactured in accordance with the ASTM A790/A790M standard. It is designed for applications requiring exceptional strength, superior corrosion resistance, and long-term reliability in harsh environments such as oil and gas, chemical processing, offshore engineering, power generation, and seawater desalination.
 

 

ASTM A790/A790M is the American Society for Testing and Materials (ASTM) specification titled:

ASTM A790/A790M – Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe

This standard covers the requirements for both seamless and welded duplex stainless steel pipes, including chemical composition, mechanical properties, dimensions, tolerances, heat treatment, and testing methods.
 

 

The chemical composition of ASTM A790 Duplex 2205 Pipe is carefully controlled to achieve an ideal balance between ferrite and austenite phases. This unique microstructure provides outstanding corrosion resistance, high mechanical strength, and excellent weldability.

The addition of approximately 22% chromium, 5–6% nickel, 3% molybdenum, and nitrogen significantly improves resistance to pitting, crevice corrosion, and chloride stress corrosion cracking (SCC). Compared with conventional austenitic stainless steels such as 304 and 316L, Duplex 2205 performs exceptionally well in aggressive environments containing chlorides and acidic media.

Typical chemical composition:
 

Element	Content (%)
Carbon (C)	≤0.030
Chromium (Cr)	22.0–23.0
Nickel (Ni)	4.5–6.5
Molybdenum (Mo)	3.0–3.5
Nitrogen (N)	0.14–0.20
Manganese (Mn)	≤2.00
Silicon (Si)	≤1.00
Phosphorus (P)	≤0.030
Sulfur (S)	≤0.020

 

ASTM A790 Duplex 2205 Pipe offers excellent mechanical performance, combining high strength with good ductility and toughness. Its yield strength is approximately twice that of standard 316L stainless steel, allowing engineers to reduce wall thickness without compromising structural integrity.

The superior mechanical properties make Duplex 2205 an ideal choice for pressure vessels, pipelines, offshore platforms, and other demanding industrial applications.

Typical mechanical properties include:
 

Property	Value
Yield Strength	≥450 MPa
Tensile Strength	≥620 MPa
Elongation	≥25%
Hardness	≤290 HB

 

 

ASTM A790 Duplex 2205 pipes are available in a wide range of sizes to meet various industrial requirements. Both seamless and welded pipes are manufactured with strict dimensional tolerances to ensure accurate installation and reliable performance.

Available specifications include:

Outside Diameter (OD): 1/8" to 48"

Wall Thickness: Schedule 10 to Schedule XXS

Length: 6 m, 12 m, Random Length, or Custom Cut Length

Dimensional tolerances comply with ASTM A790 and customer-specific requirements, ensuring:

 Accurate outside diameter

 Uniform wall thickness

 Straightness control

 Excellent roundness

 Consistent pipe quality

Precision manufacturing minimizes installation time while improving system safety and efficiency.
 

 

All ASTM A790 Duplex 2205 pipes undergo solution annealing followed by rapid water quenching to obtain the optimal duplex microstructure.

Proper heat treatment helps achieve:

Balanced ferrite and austenite structure

Improved corrosion resistance

Enhanced mechanical properties

Better toughness and ductility

Reduced residual stress

Typical heat treatment temperature:

1020°C–1100°C, followed by rapid water quenching.

Strict temperature control ensures compliance with ASTM A790 requirements and maintains consistent product quality.

 

 

Every ASTM A790 Duplex 2205 Pipe is subjected to comprehensive inspection and testing before delivery to ensure compliance with international quality standards.

Standard testing procedures include:

Chemical Composition Analysis

Mechanical Property Testing

Hydrostatic Pressure Test

Eddy Current Test

Ultrasonic Testing (UT)

Positive Material Identification (PMI)

Dimensional Inspection

Surface Quality Inspection

Flattening Test

Flaring Test

Intergranular Corrosion Test (when required)

Additional third-party inspections by SGS, BV, TÜV, ABS, DNV, and other internationally recognized organizations are available upon customer request.

Each pipe is supplied with a Mill Test Certificate (MTC EN 10204 3.1 or 3.2), providing complete traceability and quality assurance.

 

 

 

 

 

Fabrication Guidelines

When welding 2205 duplex pipes, maintain heat input between 0.5-2.5 kJ/mm. Use 2209 filler metal and purge with argon. Post-weld heat treatment is generally not required, but solution annealing at 1020-1100°C followed by rapid cooling is recommended for critical applications.

Corrosion Performance Data

Our ASTM A790 Duplex 2205 Pipe demonstrate excellent resistance in:

Chloride solutions up to 60°C at all concentrations

Sulfuric acid up to 20% at 20°C

Acetic acid in all concentrations at the boiling point

Seawater at velocities up to 5 m/s

Case Study: Offshore Platform Application

A North Sea operator replaced 316L piping with our 2205 duplex pipes in seawater cooling systems, achieving:

Service life extension from 3 to 15+ years

35% weight reduction due to thinner walls

Total cost savings of $2.8M over 10 years
 

 

 

Looking for a reliable ASTM A790 Duplex 2205 Pipe Manufacturer?

We provide factory-direct pricing, strict quality control, custom fabrication, and fast worldwide delivery. Whether you need super duplex pipes for offshore platforms, chemical plants, desalination systems, or marine engineering, our experienced team is ready to support your project.

Contact us today for:

Free Technical Consultation

Competitive Factory Prices

OEM & Custom Manufacturing

Fast Global Shipping

24-Hour Quotation Service
 

 

 

 

Frequently Asked Questions

Q: What's the maximum operating temperature for 2205 duplex pipes?

A: Continuous service up to 300°C is recommended. Short-term exposure up to 550°C is possible but may affect corrosion resistance.

 

Q: How does 2205 compare to carbon steel for high-pressure applications?

A: 2205 offers 2-3x higher yield strength, allowing thinner walls and weight savings, while providing complete corrosion protection without additional coatings.

 

Q: Can you provide material traceability documentation?

A: Yes, all pipes include full EN 10204 3.1 certification with heat number traceability and complete mill test reports.

 

Q: What surface finishes are available?

A: Standard mill finish (2B), polished (up to #320 grit), pickled, or sandblasted surfaces can be supplied.

 

Ready to Specify or Purchase ASTM A790 Duplex 2205 Pipe?

Request Technical Datasheet Get Instant Pricing Order Material Samples

Our metallurgy experts are available to assist with material selection and application engineering.

Whatsapp: +86-19033681875
Email: judesteel@juqing.hk

Hot Tags: astm a790 duplex 2205 pipe, China astm a790 duplex 2205 pipe manufacturers, suppliers, factory, Coiled Stainless Steel Tube, ASTM A409 Welded Large Diameter Stainless Steel Pipe, Stainless Steel Boiler Pipe JIS G3463, 904L Stainless Steel Pipe, Annealed Stainless Steel Tube, stainless steel