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Duplex Stainless Steel Tubes & Pipes



Duplex Stainless Steel Tubing

Duplex stainless steel (DSS) is featured with structure of two phases (α and γ) and has characteristics of both ferritic and austenitic stainless steel. It has good corrosion resistance and high strength. It is alloyed with 18%-28% Cr and 3%-10% Ni in the condition of low C. Some steels also contain the alloy elements such as Mo, Cu, Nb, Ti and N, etc. Comparing with ferritic stainless, duplex stainless steel has higher plasticity, ductility and better intergranular corrosion resistance and weldability. It keeps same 475℃ brittleness with ferritic stainless and high thermal conductivity. Duplex has improved yield strength, resistance to intergranular corrosion, stress corrosion, corrosion fatigue and abrasion & corrosion compared with austenitic stainless steel.

Alloy 2205 UNS S32305/S31803 is a 22% chromium, 3% molybdenum, 5-6% nickel, nitrogen alloyed duplex stainless steel with high general, localized, and stress corrosion resistance properties in addition to high strength and excellent impact toughness.

Alloy 2205 provides pitting and crevice corrosion resistance superior to 316L or 317L austenitic stainless steel tube in almost all corrosive media. It also has high corrosion and erosion fatigue properties as well as lower thermal expansion and higher thermal conductivity than austenitic.

2101 is a low nickel, lean duplex stainless steel possessing both superior strength and chloride stress-corrosion cracking resistance when compared to 300 series stainless steel.

2304 A lean austenitic-ferritic duplex stainless steel with general corrosion resistance similar to 316, but with yield strength nearly double that of austenitic stainless steel.

S31803 and S32205 are standard duplex stainless steel. A nitrogen, molybdenum enhanced austenitic-ferritic duplex stainless steel with general corrosion resistance similar to 904L, but with a yield strength nearly double that of austenitic stainless steel.

2507 (PREN 40-45), with 25-26 Cr and increased Mo and N compared with the 25Cr grades. A super austenitic-ferritic duplex stainless steel with exceptional strength and corrosion resistance ideal for chemical process, petrochemical, and seawater applications.

Duplex Stainless Steel Pipe Specifications:
ASTM A789 Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service
ASTM A790 (ASME SA790) Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe
ASTM A928 (ASME SA928) Standard Specification for Ferritic/Austenitic (Duplex) Stainless Steel Pipe Electric Fusion Welded with Addition of Filler Metal
GB/T 21832-2008 Austenitic--Ferritic(duplex) grade stainless steel welded tubes and pipes
GB/T 21833-2008 Austenitic-Ferritic (duplex) grade stainlee steel seamless tubes and pipes

Duplex Stainless Steel Pipe Features:


1.Superior resistance to general and local corrosion, especially to stress corrosion, pitting corrosion, crevice corrosion, corrosion fatigue and abrasion & corrosion.
2.Good weldability
3.Good mechanical properties
4.Excellent intergranular corrosion resistance
5.High cost-effectiveness, long life time

Duplex Stainless Steel Tube Duplex Stainless Steel Pipe
Main Testing Terms and Procedure:

  • 1. Heat Treatment and Solution Annealing / Bright Annealing
  • 2. Cutting to required length and deburring;
  • 3. Chemical Composition Analysis Test With 100% PMI and One tube from each heat by Direct Reading Spectrometer
  • 4. Visual Test and Endoscope Test for Surface Quality Test
  • 5. 100% Hydrostatic Test and 100% Eddy Current Test
  • 6. Ultrasonic Test subject to the MPS (Material Purchase Specification)
  • 7. Mechanical Tests includes Tension Test, Flattening Test, Flaring Test, Hardness Test
  • 8. Impact Test subject to Standard request
  • 9. Grain Size Test and Intergranular Corrosion Test
  • 10. Ultrasoic measuring of Wall Thickness
  • Marking & Packing

  • Marking according to MPS and Standard
  • Stainless Steel Tubes Ends with Caps according to PO
  • In Seaworthy Wooden Cases With Plastic Paper protect
  • In Plywood Cases With Plastic Paper Protect(Recommend, All Plywood Cases made by ourselves with lower cost.)
  • Steel Racks Package
  • Hexagonal packing in Bundles


  • Quality Control

  • Third Part Inspection Accepted according to EN 10204 3.2
  • ISO 9001 - 2008 issued by Lloyd's,
  • PED 97/23/EC By Lloyd's,
  • ASME Boiler and Pressure Vessel Code Certificated Certificate Issued by TUV

  • Mechanical property

    Yield strength (MPa)  Tensile strength (MPa)  Elongation (%) 
    ≥500 ≥680 ≥30

    Physics Capability

    density: 7.85g/cm3

    Grade(UNS): Duplex Stainless Steel:
    S32001, S32003, S31500, 2205(1.4462); S32304,(1.4362);S31803,2507 (S32750), S32760(1.4501);S32101(1.4162);

    Super Austenitic Stainless Steel: 904L, S30432, S31042, 6Mo (S31254, N08367)

    Outside Diameter(OD): 6 - 323.8mm
    Wall Thickness(WT): 0.50 - 30mm
    Standards(Norm): EN 10216-5; DIN 17456, DIN 17458, DIN 2462, DIN 17455
    GB/T14975; T14976; T13296; GB5310;
    ASTM A213, A269, A312, A511, A789, A790, A928, A999, A1016, ASTM B161, ASTM B163, ASTM B165, ASTM B167, ASTM B338, ASTM B407, ASTM B423, ASTM B444,ASTM B619, ASTM B622, ASTM B626, ASTM B668, ASTM B677, ASTM B829
    JIS G3459, JIS G3463, JIS G3446, JIS G3447, JIS G3448, JIS G3468
    GOST 9940;GOST 9941;


    Related References:
    1. Duplex Stainless Steel Pipe
    2. Duplex Stainless Steel
    3. Super-Duplex Stainless Steel
    4. Principle of Duplex Stainless Steel
    5. How the Austenite Ferrite Balance Achieved
    6. Corrosion Resistance of Duplex Stainless Steel
    7. Stress Corrosion Cracking SCC of Duplex Stainless Steel
    8. Barrier to Using Duplex Stainless Steel
    9. Duplex Stainless Steel Grades Comparison Table
    10. S32101 | S32205/S31803 | S32304 | S32750 | S32760

    ASTM A789/A789M
    ASTM A 790/A 790M
    Duplex Stainless Steel Pipe
    Austenitic-Ferritic Stainless Steel Pipe
    Super-Duplex Stainless Steels and their characteristics
    2507 S32750(1.4410) Duplex Steel
    S32205 S31803(1.4462) Duplex Steel
    S32304(1.4362) Duplex Steel
    Use of stainless steel under high temperature condition refer table
    Corrosion Resistant Stainless Steel Tube
    Corrosion Resistance of Stainless Steel Tubes
    High Temperature Stainless Steel Tubes
    High Temperature Stainless Steel Tubes
    High Temperature Property Stainless Steel
    Welded Stainless Steel Pipe
    U-bend Stainless Steel Tubes
    Heat Exchanger Tubes
    Duplex Stainless Steel Tubes
    Boiler Tubes, Condenser Tubes
    Corrugated Seamless Stainless Steel Pipe Tube
    DIN 2391 Seamless Precision Steel Tubes
    DIN2391 Seamless Pricision Steel Tube Tubing Tubes
    Non Acid-resisting Stainless Steel Tube
    Bright Annealing Stainless Steel Tubes
    High Temperature-Tubes and Pipes Standards
    Heat Resistant Stainless Steels and Corrosion Resistant Stainless Steels-Valve Steels,Iron Baes Super alloys
    Compared with the ferritic stainless steel, duplex stainless steel vulnerable
    Compared with the austenitic stainless steel, duplex stainless steel strengths and vulnerable

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    Stainless Steel Tubing and Pipe:

    Heat Exchanger Tubes
    U Bend Stainless Steel Tubing
    Duplex Stainless Steel Pipe
    Boiler Tubes, Condenser Tubes
    Stainless Steel Seamless Pipes Corrugated Seamless Stainless Steel Pipe Tube
    Cold Drawn Bright Annealing Stainless Steel Tubes
    Heat resistant Stainless Steel Tubes
    Welded Stainless Steel Pipe
    Corrosion Resistant Stainless Steel Tube
    Corrosion Resistance of Stainless Steel Tubes
    Nickel Alloy Seamless Tubes:

    UNS N08020 2.4600 Nickel Alloy 20 Seamless Tubing
    UNS N02200 2.4066 200 Nickel Alloy Seamless Tubing
    UNS N04400 400 Nickel Alloy 2.4360 Nickel Alloy Tubing
    UNS N08800 800 Nickel Alloy Seamless Tubes
    UNS N08810 800H UNS N08810 Nickel Alloy Seamless Tubes
    UNS N08811 800HT Nickel Alloy Seamless Tubes
    UNS N08825 825 2.4858 Nickel Alloy Seamless Tubes
    UNS N06600 600 2.4816 Nickel Alloy Seamless Tubes
    UNS N06625 625 2.4856 Nickel Alloy Seamless Tubes
    UNS N10276 C-276 2.4819 Nickel Alloy Seamless Tubing
    Why Choose US?

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    E-mail:sales@tubingchina.com
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