Duplex Stainless Steel Seamless Pipe China Manufacturer
UNS S32205 | For Extreme Environments
22% Cr, 5% Ni duplex pipes delivering 2x yield strength vs 316L. Perfect for offshore risers handling H₂S-containing media (-30°C to 250°C). Pitting Resistance Equivalent >40. Buy duplex stainless steel pipe from China manufacturer Guangxin PipeTech. Duplex 2507 pipe with H₂S resistance for oil & gas. Get competitive prices!
Duplex Stainless Steel Pipe Classifications and Applications
By Material
A... moreDuplex Stainless Steel Seamless Pipe China Manufacturer
UNS S32205 | For Extreme Environments
22% Cr, 5% Ni duplex pipes delivering 2x yield strength vs 316L. Perfect for offshore risers handling H₂S-containing media (-30°C to 250°C). Pitting Resistance Equivalent >40. Buy duplex stainless steel pipe from China manufacturer Guangxin PipeTech. Duplex 2507 pipe with H₂S resistance for oil & gas. Get competitive prices!
Duplex Stainless Steel Pipe Classifications and Applications
By Material
Austenitic Stainless Steel: 304, 316L, 321, 317L
Duplex Stainless Steel: 2205, 2507
Nickel Alloys: Monel 400, Inconel 600/625, Incoloy 825, Hastelloy C-276, etc.
By Pipe Shape & End Type
Round Seamless Pipes (most common)
Square and Rectangular Seamless Tubes (available upon request)
Plain End (PE), Beveled End (BE), or Threaded End (TE)
By Size Range
Outer Diameter (OD): from 6mm to 630mm
Wall Thickness: from 0.5mm to 50mm
Length: fixed length or random length (up to 12 meters or as per customer specification)
By Application
Application Area Typical Material Key Features
Chemical & Petrochemical 316L, 317L, Alloy 825 Acid and corrosion resistance
Marine & Offshore 2205, 2507, Alloy 625 Chloride resistance and high strength
Power & Heat Exchangers 321, Inconel 600 Thermal stability and pressure resistance
Oil & Gas (Sour Service) Alloy 400, Alloy 825 Resistance to H₂S and CO₂ environments
Pharmaceutical & Sanitary 304L, 316L Clean surfaces and hygienic performance
Duplex Stainless Steel Seamless Pipe Specification
Technical Specifications
PREN Value ≥35
Phase Balance Ferrite 40-55%
Impact Toughness 100J @ -46°C
Chloride Resistance ≤15,000ppm @80°C
Certification NORSOK M-630
Guangxin PipeTech’s duplex stainless steel pipe, including duplex 2507 pipe, offers PREN≥35, ideal for duplex stainless steel pipe applications in LNG cryogenic systems (-165°C). Buy duplex seamless pipe with NORSOK M-630 certification for offshore projects at competitive duplex pipe prices.
Features of Duplex Stainless Steel Seamless Pipe
Duplex UNS S32205 Seamless Pipes
Phase-Balanced Chemistry:
UNS S32205 (22Cr-5Ni-3Mo-0.15N) requires ferrite-austenite phase equilibrium (40-55% ferrite) per ASTM A182. The PREN (Pitting Resistance Equivalent Number) exceeds 35, calculated as %Cr + 3.3x%Mo + 16x%N. Critical copper impurity is controlled at <0.5% to avoid sigma phase precipitation.
Mechanical Superiority:
Yield Strength: 450-550 MPa (2x 316L)
Fatigue Endurance: 380 MPa at 10⁶ cycles (DNV-OS-F101)
Thermal Conductivity: 15 W/m·K @100°C (25% higher than 316L)
CTE: 13 µm/m°C (20-100°C) avoiding thermal stress cracking
Offshore-Grade Production:
Billets solution-treated at 1080°C with accelerated water quenching achieves ASTM grain size 7-8. Automatic ultrasonic testing detects imperfections >5% wall thickness. Hardness is maintained at 250-290 HV30 to meet NACE standards.
Oil & Gas Applications:
Subsea Christmas tree components (API 6A specification)
Seawater-cooled heat exchangers handling H₂S at 50 ppm
Geothermal brine injection systems at 150°C
LNG cryogenic transfer pipes (-165°C service)
Certification Suite:
NORSOK M650-S1 • ASTM A790 • ISO 15156-3 (Material Class 3c)
#duplex #seamless #pipe
https://www.gxpipetech.com/products/duplex-stainless-steel-seamless-pipe/
