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Quality Stainless Steel Duplex Pipe 2205 2507 Cold Drawn Seamless Tubing factory
Quality Stainless Steel Duplex Pipe 2205 2507 Cold Drawn Seamless Tubing factory

Stainless Steel Duplex Pipe 2205 2507 Cold Drawn Seamless Tubing

Basic Properties
Place of Origin: MADE IN CHAINA
Brand Name: Baosteel，TISCO
Certification: EN 10204 Type 3.1 / 3.2 available
Model Number: 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507
Trading Properties
Minimum Order Quantity: 100kg
Price: Negotiable (Request a Quote)
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Ability: 10000tons
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Molybdenum Alloy Stainless Steel Pipe

Stainless Steel Pipe Chloride Resistance

Stainless Steel Duplex Pipe Seamless
Product Summary
Seamless duplex stainless steel tube is manufactured without any weld seam, produced by extruding a solid billet of duplex stainless steel into a hollow tube through a piercing and rolling process. The absence of a weld seam provides superior strength, uniform wall thickness, and excellent ...

Product Details

Highlight:

Stainless Steel Duplex Pipe Seamless

,

2205 Cold Drawn Seamless Tubing

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2507 Cold Drawn Seamless Tubing
Country Of Origin: MADE IN CHAINA
Brand: Baosteel，TISCO
Certifications: ISO/EN 10204 Type 3.1 / 3.2 Available
Grade: 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507 / 630 (17-4PH)
MOQ: 100kg
Price: Negotiable (Request A Quote)
Packaging: Wooden Case / Wooden Pallet / Steel Frame / Carton / Woven Bag
Delivery Time: 15-25days
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Capacity: 10000tons
Product Description

Seamless duplex stainless steel tube is manufactured without any weld seam, produced by extruding a solid billet of duplex stainless steel into a hollow tube through a piercing and rolling process. The absence of a weld seam provides superior strength, uniform wall thickness, and excellent performance under high pressure, high temperature, and corrosive conditions.

Our seamless duplex tubes offer the unique combination of high strength (approximately twice that of austenitic grades) and outstanding corrosion resistance, making them ideal for critical applications where welded tubes may present a risk of failure.

Product Specifications
Parameter Details
Standard ASTM A789, A790, A269, EN 10216-5, ISO 13628
Grades 2205 (UNS S31803, S32205), 2507 (UNS S32750, S32760), 2304 (UNS S32304)
Size (OD) 1.6 mm – 254 mm (1/16" – 10")
Wall Thickness 0.5 mm – 12.5 mm
Length Random lengths 3m – 12m (custom cut available, coil lengths for small diameters)
Production Process Cold drawn seamless (CDS) or Cold rolled seamless (CRS)
Surface Finish Annealed and pickled, Bright annealed (BA), Polished, Mechanically descaled
End Finish Plain ends, Beveled ends, Threaded
Chemical Composition by Grade (Reference %)
Element 2205 (S31803) 2205 (S32205) 2507 (S32750) 2304 (S32304)
Carbon (C) ≤ 0.030 0.030 0.030 0.030
Silicon (Si) ≤ 1.00 1.00 0.80 1.00
Manganese (Mn) ≤ 2.00 2.00 1.20 2.50
Phosphorus (P) ≤ 0.030 0.030 0.035 0.035
Sulfur (S) ≤ 0.020 0.020 0.020 0.020
Chromium (Cr) 21.0 – 23.0 22.0 – 23.0 24.0 – 26.0 21.5 – 24.5
Nickel (Ni) 4.5 – 6.5 4.5 – 6.5 6.0 – 8.0 3.0 – 5.5
Molybdenum (Mo) 2.5 – 3.5 3.0 – 3.5 3.0 – 5.0 0.05 – 0.60
Nitrogen (N) 0.08 – 0.20 0.14 – 0.20 0.24 – 0.32 0.05 – 0.20
Copper (Cu) ≤ — — 0.50 —
Tungsten (W) — — — —
Mechanical Properties by Grade
Grade Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Hardness (HB) Hardness (HRC)
2205 (S31803) ≥ 620 ≥ 450 ≥ 25 ≤ 290 ≤ 30
2205 (S32205) ≥ 620 ≥ 450 ≥ 25 ≤ 290 ≤ 30
2507 (S32750) ≥ 730 ≥ 550 ≥ 20 ≤ 310 ≤ 32
2304 (S32304) ≥ 600 ≥ 400 ≥ 25 ≤ 290 ≤ 30

Note: The values above are minimum requirements per ASTM A789/A790. Please refer to the mill test certificate for actual data.

Physical Properties
Property 2205 2507 2304
Density (g/cm³) 7.8 7.8 7.8
Modulus of Elasticity (GPa) 200 200 200
Thermal Conductivity (W/m·K at 20°C) 19 15 21
Specific Heat (J/kg·K at 20°C) 500 480 500
Electrical Resistivity (μΩ·m) 850 800 850
Magnetic Permeability Magnetic Magnetic Magnetic
PREN 33 – 35 ≥ 41 24 – 26
Key Features

No Weld Seam – Eliminates the potential weak point found in welded tubes

Uniform Wall Thickness – Consistent dimensions throughout the tube length

High Strength – Yield strength of 400-550 MPa minimum (2x austenitic grades)

Superior Corrosion Resistance – Excellent pitting, crevice, and SCC resistance

High Pressure Capability – Suitable for critical high pressure service

High Temperature Performance – Operates reliably up to 300°C

Full Traceability – Complete mill documentation from billet to final tube

Seamless vs. Welded Duplex Tube Comparison
Feature Seamless Tube Welded Tube
Weld Seam None Present
Wall Thickness Consistency Very consistent Consistent
Pressure Rating Higher Lower
Corrosion Resistance Uniform throughout Potential weld seam corrosion
Sour Service (H₂S) Preferred Acceptable with NACE qualification
Small Diameters (< 25mm) Yes Difficult / expensive
Length Availability Shorter typical Longer lengths available
Cost Higher Lower
Lead Time Longer Shorter
Best For High pressure, sour gas, heat exchangers, umbilical tubing General corrosive service, structural, lower pressure
Applications

Seamless duplex stainless steel tube is specified for critical applications where reliability cannot be compromised:

Oil & Gas

  • Downhole production tubing
  • Subsea control umbilicals
  • Instrumentation tubing
  • Hydraulic lines
  • Sour service (H₂S) flow lines
  • Christmas tree components
  • Wellhead control lines

Chemical & Petrochemical

  • High pressure chemical injection lines
  • Heat exchanger tubes
  • Reactor tubes
  • Corrosive fluid transfer
  • Process instrumentation lines

Marine & Offshore

  • Seawater hydraulic lines
  • Subsea control systems
  • ROV umbilicals
  • Offshore platform instrumentation
  • Desalination plant tubing

Power Generation

  • Nuclear power instrumentation lines
  • Geothermal production tubing
  • Condenser tubes (small diameter)
  • Steam sampling lines

Pharmaceutical & Food

  • High purity fluid transfer
  • Sanitary process lines
  • Brine handling systems

Aerospace & Defense

  • Hydraulic systems
  • Fuel lines
  • Instrumentation tubing
Small Diameter Seamless Duplex Tube (Umbilical / Instrumentation)
OD (mm) Wall Thickness (mm) Typical Application
6.35 (1/4") 0.89, 1.24, 1.65 Hydraulic lines, instrumentation
9.53 (3/8") 1.24, 1.65, 2.11 Control lines, umbilicals
12.70 (1/2") 1.65, 2.11, 2.77 Chemical injection, hydraulics
15.88 (5/8") 1.65, 2.11, 2.77 Umbilical tubes
19.05 (3/4") 1.65, 2.11, 2.77 Service lines
25.40 (1") 2.11, 2.77, 3.40 Flow lines
Fabrication Guidelines for Seamless Duplex Tube
Process Recommendation
Bending Cold bending with minimum radius of 3x OD. Use mandrel for tight radii.
Flaring / Swaging Acceptable with proper tooling. Annealed condition preferred.
Cutting Use abrasive saw, cold saw, or precision tube cutter. No thermal cutting.
Threading Possible on thicker walls. Use sharp tools and proper lubrication.
Welding (to fittings) Use matching filler metal (2209 for 2205, 2509 for 2507). Strict heat input control.
Heat Treatment Solution anneal after cold working. 1040-1120°C followed by water quench.
Contact Us

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