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  • ASTM A790 UNS S31803 Duplex Steel Pipe
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    ASTM A790 UNS S31803  Duplex Stainless Steel Pipe
    Standard Specification for
    Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe
    ASTM A790 UNS  S31803 Steel Pipe covers seamless and straight-seam welded ferritic/austenitic steel pipe intended for general corrosive service, with particular emphasis on resistance to stress corrosion cracking. 
    ASTM A790 UNS  S31803  Duplex Stainless Steel Pipe Quick Details
    Company Name: Beite steel pipe
    Country/Region: China
    Product Name:ASTM A790 UNS  S31803  Duplex Stainless Steel Pipe
    Manufacture:seamless or an automatic welding
    Outside Diameter:12.7mm——219mm
    Wall thickness:0.9mm——20mm
    Length:6000mm、12000m or specified length as require
    Port of Shipment:Tianjin,China
    Payment:L/C or T/T
    Delivery: 7-15 days after payment
    Package: Bundles (hexagonal),Wooden Boxes,Crates (steel/wooden)
    Materials and Manufacture
    The pipes are made by the seamless or an automatic welding process, with no addition of filler metal in the welding operation.
    pipe may be either hot-finished or cold-finished.
    The pipes are pickled free of scale. When bright annealing is used, pickling is not necessary.
    all pipe are furnished in the heat-treated condition as shown in Table 1.
    TABLE 1 Heat Treatment

    Temperature °F [°C] Quench
    S31803 1870–2010
    Rapid cooling in air or water
    Chemical Composition
    C Mn P S Si Ni Cr Mo N
    S31803 0.030 2.00 0.030 0.020 1.00 4.5–6.5 21.0–23.0 2.5–3.5 0.08–0.20

    Mechanical Properties
    Type A Tensile Strength,
    min, ksi[MPa]
    min,ksi [MPa]
    in 2 in. or 50 mm,min, %
    Hardness, max 
    S31803   90 [620] 65 [450] 25 290 30

    Workmanship, Finish, and Appearance
    The finished pipes shall be reasonably straight and shall have a workmanlike finish. 
    Mechanical Tests Required
    Transverse or Longitudinal Tension Test
    Mechanical Testing Lot Definition
    Flattening Tes
    Hardness Test
    Hydrostatic or Nondestructive Electric Test
    Product Marking
    the marking include the manufacturer’s private identifying mark and whether the pipe is seamless or welded. If specified in the purchase order, the marking for pipe larger than NPS 4 shall include the weight.
    Ordering Information
    1.1 Quantity (feet, [metres], or number of lengths),
    1.2 Name of material (ferritic/austenitic steel pipe),
    1.3 Process (seamless or welded),
    1.4 Grade (UNS S31803),
    1.5 Size (NPS designator or outside diameter and schedule number of average wall thickness),
    1.6 Length (specific or random) ,
    1.7 End finish (section on ends of Specification A999/A999M),
    1.8 Test report required (section on certification of Specification A999/A999M),
    1.9 Specification designation, and


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