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Home Stainless Steel Tube & Pipe 2205 Duplex Stainless Steel Pipe​

2205 Duplex Stainless Steel Pipe​

In-stock availability for fast shipping | MTC certification included | Competitive bulk project pricing

High-Strength Duplex Steel Pipe, Combining Superior Chloride Stress Corrosion Cracking Resistance with Structural Strength, for Subsea Pipelines and Demanding Chemical Processes.

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  • High Strength

    Boost structural efficiency and cut pipe weight by 30% compared to 316L, saving on both material and transport costs.

  • Superior Corrosion Resistance

    Engineered for harsh subsea & chemical environments, significantly reducing maintenance downtime.

  • Fatigue Performance

    Endures ≥10⁷ fatigue cycles at 300 MPa, ideal for offshore pipelines subject to vibration.

Product Specifications

Chemical Composition (ASTM A789 Standard)
Element Content (%) Role in Duplex Steel
Cr 21.0–23.0 Forms passive film; Mo synergistically enhances corrosion resistance; duplex microstructure refines grains.
Ni 4.5–6.5 Stabilizes austenite; ~1:1 duplex ratio, balances strength and toughness.
Mo 2.5–3.5 Enhances pitting resistance; maintains passive film in chloride-rich crude oil.
Physical & Mechanical Properties

  • Physical: Density 7.8 g/cm³, Melting Point 1300–1390℃, Thermal Conductivity 25 W/(m·K) (50% higher than 304)

  • Mechanical: Impact energy at -40℃ ≥34 J; good weldability; welded joint strength ≥90% of base metal

Specifications & Supply Range

  • Outer Diameter: 25–325 mm

  • Wall Thickness: 3–20 mm

  • Length: 6–12 m (±10 mm)

  • Surface Treatment: Outer wall sandblasted (anti-slip), inner wall mechanically polished (Ra ≤1.6 μm), optional PE anti-corrosion layer

 

Pricing Calculation

Workshop & Manufacturing Machine

Stainless Steel Tubes Packed in Truck

Wooden Crate Packaging in Factory

Neo-Mac Machine with Stainless Steel Tubes

Factory Tube Packaging Process

Industrial Manufacturing Equipment

Stainless Steel Composition Analyzer

Product Applications

  • Subsea Oil Transport

    Specification: Φ168×8 mm

    Performance: Pressure resistance 12 MPa, H₂S corrosion resistant

    Case: Liwan Oilfield subsea pipelines used in shipbuilding yards.

  • High-Pressure Chemical Pipeline

    Specification: Φ89×6 mm

    Performance: Resistant to 10% HCl (60℃)

    Case: Sinopec Maoming ethylene project process pipelines used in chemical production workshops.

Why Choose Walmay for 2205 Duplex?

  • Engineering Advantage: 1.8x the yield strength of 316L, allowing for 30% reduction in structural weight and material costs.
  • Superior Corrosion Resistance: PREN ≥ 34, offering exceptional protection against chloride stress corrosion cracking in seawater and sour oil & gas service.
  • Performance Note: Optimized for high-pressure heat exchangers and chemical processing. Note: Not recommended for service temperatures exceeding 315°C to avoid potential embrittlement.

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Ready? Please provide your required specifications, grade, and expected quantity below. Our engineering team will review your project needs and provide a tailored quote.

Committed to Global Standards

  • Quality Traceability: Every order is backed by full documentation, including detailed chemical analysis and certified Mill Test Certificates (MTCs).

  • International Compliance: Our entire production process strictly adheres to ISO 9001 standards to maintain global manufacturing excellence.

  • Failure-Free Performance: We implement rigorous quality control protocols to ensure reliable, high-performance operation in your most critical pipeline systems.

FAQs

What is a duplex 2205 pipe?
A duplex 2205 pipe is a stainless steel pipe with a dual-phase microstructure (austenitic + ferritic). It delivers higher yield strength and exceptional resistance to stress corrosion cracking.
What standards cover this material?
It is produced under ASTM A789/A790 and ASME SA789/SA790, with equivalent designations UNS S31803, UNS S32205, and W.Nr. 1.4462.
Why choose duplex 2205 pipe instead of 316L?
This grade offers a better strength-to-weight ratio, improved pitting resistance (PREN ≥40), and lower subsea installation costs compared to 316L.
Can it be welded and fabricated?
Yes. With the correct filler metals and procedures, welds achieve ≥90% of base metal strength. The alloy also supports cold forming and machining.
Where is it commonly used?
Typical applications include offshore pipelines, chemical processing lines, heat exchangers, and desalination plants.
Are there service limitations?
Prolonged exposure above ~315 °C may lead to embrittlement, so high-temperature service is limited.
What sizes of duplex 2205 pipe are available?
Common dimensions include diameters 25–325 mm, wall thickness 3–20 mm, and lengths 6–12 m, with optional surface treatments.

Need more details on stainless steel products? Feel free to contact Walmay anytime.

Walmay will help match the right stainless product form and specification for your application, confirm quantities and packing needs, and provide requested documents based on order requirements.

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