Home / Products / Stainless Steel Pipe / ASTM A790 Welded Duplex Stainless Steel Pipe Grade 2205 2507 2304
Quality ASTM A790 Welded Duplex Stainless Steel Pipe Grade 2205 2507 2304 factory
Quality ASTM A790 Welded Duplex Stainless Steel Pipe Grade 2205 2507 2304 factory

ASTM A790 Welded Duplex Stainless Steel Pipe Grade 2205 2507 2304

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
Tags

Molybdenum Alloy Stainless Steel Pipe

Stainless Steel Pipe Chloride Resistance

Welded Duplex Stainless Steel Pipe
Product Summary
Welded duplex stainless steel pipe is manufactured by forming a flat strip of duplex stainless steel into a cylindrical shape and welding the longitudinal seam. This process produces a pipe with excellent dimensional accuracy, consistent wall thickness, and a cost-effective solution for corrosive ...

Product Details

Highlight:

Welded Duplex Stainless Steel Pipe

,

ASTM A790 Duplex Stainless Steel Pipe

,

Welded Stainless Steel Pipe 2205
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

Welded duplex stainless steel pipe is manufactured by forming a flat strip of duplex stainless steel into a cylindrical shape and welding the longitudinal seam. This process produces a pipe with excellent dimensional accuracy, consistent wall thickness, and a cost-effective solution for corrosive service applications.

Our welded duplex pipes are produced using advanced welding techniques including ERW (Electric Resistance Welding), EFW (Electric Fusion Welding), and DSAW (Double Submerged Arc Welding). They offer the same high strength and corrosion resistance as seamless pipes at a more economical price point for many applications.

Product Specifications
Parameter Details
Standard ASTM A790, A928, ASME SA790, EN 10217-7, ISO 13628
Grades 2205 (UNS S31803, S32205), 2507 (UNS S32750, S32760), 2304 (UNS S32304)
Size (OD) 6.0 mm – 1829 mm (1/8" – 72")
Wall Thickness 1.0 mm – 50.0 mm (Schedule 5S through XXS)
Length 3000 mm, 6000 mm, random lengths 6m – 12m (custom cut available)
Welding Process ERW (up to 24"), EFW (16" – 72"), DSAW (24" – 72")
Surface Finish Mill finish, Annealed and pickled, Mechanically polished
End Finish Plain ends, Beveled ends, Threaded, Grooved
Welding Processes for Duplex Pipe
Process Size Range Description Best For
ERW (Electric Resistance Welding) 6 mm – 610 mm (1/8" – 24") High frequency current welds the seam without filler metal Small to medium diameters, high volume
EFW (Electric Fusion Welding) 406 mm – 1829 mm (16" – 72") TIG or plasma arc welding with filler metal Large diameters, critical service
DSAW (Double Submerged Arc Welding) 610 mm – 1829 mm (24" – 72") Welded from both inside and outside Heavy wall, large diameter pipelines
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
Mechanical Properties by Grade
Grade Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Hardness (HB)
2205 (S31803) ≥ 620 ≥ 450 ≥ 25 ≤ 290
2205 (S32205) ≥ 620 ≥ 450 ≥ 25 ≤ 290
2507 (S32750) ≥ 730 ≥ 550 ≥ 20 ≤ 310
2304 (S32304) ≥ 600 ≥ 400 ≥ 25 ≤ 290

*Note: The values above are minimum requirements per ASTM A790/A928. Please refer to the mill test certificate for actual data.*

Key Features
  • Cost Effective – Lower cost than seamless duplex pipe for equivalent performance
  • Long Lengths – Can be produced in very long continuous lengths
  • Consistent Dimensions – Uniform OD, ID, and wall thickness
  • High Strength – Yield strength twice that of austenitic grades
  • Excellent Corrosion Resistance – Superior pitting and SCC resistance
  • Large Diameter Capability – Available up to 72" (1829 mm) OD
  • Full Heat Treatment – Solution annealed and pickled after welding
Welded vs. Seamless Duplex Pipe Comparison
Feature Welded Pipe Seamless Pipe
Weld Seam Present None
Size Range 6 mm – 1829 mm 6 mm – 610 mm
Maximum Wall Thickness Up to 50 mm Up to 25 mm
Length Availability Very long coils / lengths Shorter typical lengths
Cost Lower Higher (30-50% more)
Lead Time Shorter Longer
Dimensional Consistency Excellent Very good
Pressure Rating Good (with proper weld) Higher
Sour Service (H₂S) Yes (with NACE qualification) Preferred
Best For General corrosive service, pipelines, large diameters Critical high pressure, small diameters
Applications

Welded duplex stainless steel pipe is widely used across demanding industries:

Oil & Gas
  • Onshore and offshore flow lines
  • Pipeline systems
  • Platform topside piping
  • Gathering lines
  • Water injection lines
Chemical & Petrochemical
  • Process piping
  • Chemical transfer lines
  • Heat exchanger shell and tube
  • Storage tank piping
Marine & Desalination
  • Seawater intake and discharge lines
  • Desalination plant piping
  • Ballast water systems
  • Firewater systems
Pulp & Paper
  • Bleach plant piping
  • Process liquor lines
  • Effluent treatment systems
Power Generation
  • Cooling water systems
  • Flue gas desulfurization (FGD) piping
  • Condenser water lines
Mining
  • Slurry pipelines
  • Process water lines
  • Tailings lines
Water Treatment
  • Reverse osmosis piping
  • High pressure brine lines
  • Wastewater treatment
Sour Service

For applications containing hydrogen sulfide (H₂S), welded duplex pipe can be supplied in accordance with NACE MR0175 / ISO 15156.

Requirement Detail
Applicable Grades 2205, 2507
Hardness Limit ≤ 28 HRC (for sour service)
Weld Seam Hardness ≤ 28 HRC
Certification NACE MR0175 compliance certificate
Testing HIC and SSC testing available
Large Diameter Welded Duplex Pipe (EFW / DSAW)
OD (inches) OD (mm) Typical Wall Thickness (mm) Typical Application
16" – 24" 406 – 610 6.0 – 12.7 Process piping
26" – 36" 660 – 914 8.0 – 15.9 Seawater intake
38" – 48" 965 – 1219 9.5 – 19.1 Large diameter pipelines
50" – 72" 1270 – 1829 12.7 – 25.4 Penstocks, large headers
Contact Us

Need welded duplex pipe for your next project? We are ready to help.

Related Products
  • Quality Precision 301 304 316 430 Cold Rolled Stainless Steel Strip 2B BA No.4 Finish factory

    Precision 301 304 316 430 Cold Rolled Stainless Steel Strip 2B BA No.4 Finish
    Precision cold rolled stainless steel strip is a narrow, thin-gauge stainless steel product manufactured to significantly tighter thickness and width tolerances than standard cold-rolled sheet. Unlike standard sheet (typically 1000mm or 1219mm wide), precision strip is produced in narrow widths — usually less than 600mm — and thin gauges from 0.05mm up to 3.0mm. The key differentiator is the tolerance : the precision strip holds thickness variations to as low as ±0.005mm,
  • Quality High Precision 304 Stainless Steel Seamless Pipe Cold Rolled Corrosion Resistance factory

    High Precision 304 Stainless Steel Seamless Pipe Cold Rolled Corrosion Resistance
    304 Stainless Steel Seamless Pipe The 304 stainless steel seamless pipe is a globally recognized standard grade in the stainless steel family. With a chemical composition of 18% chromium and 8% nickel, it offers excellent corrosion resistance, high toughness, and outstanding formability. Manufactured using precision seamless cold-rolling technology, this pipe delivers a superior surface finish, tight dimensional tolerances, and consistent mechanical properties — making it the
  • Quality UNS N06022 Hastelloy C-22 Alloy Corrosion Resistant ASTM B622 factory

    UNS N06022 Hastelloy C-22 Alloy Corrosion Resistant ASTM B622
    UNS N06022 is a nickel-chromium-molybdenum alloy renowned for its exceptional resistance to both oxidizing and reducing corrosive media. With a higher chromium content than C-276, plus controlled additions of tungsten, this alloy offers superior resistance to pitting, crevice corrosion, and stress-corrosion cracking in aggressive environments. UNS N06022 provides outstanding performance in wet chlorine, hydrochloric acid, sulfuric acid, and mixed acid solutions where many
  • Quality Austenitic Corrosion Resistant Hastelloy C-22 Nickel Alloy For Harsh Chemical Processing factory

    Austenitic Corrosion Resistant Hastelloy C-22 Nickel Alloy For Harsh Chemical Processing
    Hastelloy C-22: Ultimate Corrosion-Resistant Nickel Alloy Hastelloy C-22 is a fully austenitic, advanced corrosion-resistant nickel-chromium-molybdenum-tungsten alloy. It offers outstanding resistance to both uniform corrosion in oxidizing media and localized attack (pitting, crevice corrosion) in reducing environments. Unlike standard alloys, C-22 provides exceptional resistance to stress corrosion cracking (SCC), intergranular attack, and weld heat-affected zone (HAZ)

Send An Inquiry