Duplex Pipe, Valves, Fittings & Flanges

U. S. Metals diverse inventory offers a full range of Duplex Pipe, Valves, Fittings & Flanges that is prominent in the process industry. Our support of the power & process industry is reflected in the specialty grades of material that we inventory to support outage & maintenance requirements.

Our ability to provide Duplex products on a project basis is one of our strongest capabilities and is unmatched in our industry.

Turnarounds or outages, planned retrofits or emergency situations, grassroots projects worldwide; U.S. Metals has the experienced staff to assist you on all of your specialty alloy requirements, no matter how detailed the specification, no matter how difficult the situation.

New industry requirements, not an issue. We work closely with agencies like EPRI along with our utility and refining clients to be on the cutting edge of new industry requirements that affect your high energy/high temperature piping systems.

Our inventory is evolving to meet the new specifications that prevent current issues as creep cracking and hardness problems.



  • Trade Name
    DUPLEX
    DUPLEX
    2205 DUPLEX
    SUPER DUPLEX FERRALIUM 225
    SUPER DUPLEX 2507
    SUPER DUPLEX ZERON 100
    UNS #
    S31200
    S31803
    S32205
    S32550
    S32750
    S32760
    Seamless & Welded Pipe
    (without Filler Metal)
    A/SA790
    A/SA790
    A/SA790
    A/SA790
    A/SA790
    A/SA790
    Welded Pipe
    (with Filler Metal)
    A928
    A928
    A928
    A928
    A928
    A928
    Seamless & Welded General Service Tubing
    (without Filler Metal)
    A/SA789
    A/SA789
    A/SA789
    A/SA789
    A/SA789
    A/SA789
    Sanitary Tubing
    -----
    A270
    A270
    -----
    A270
    -----
    Buttweld Fittings*
    -----
    A/SA815
    A/SA815
    A/SA815
    A/SA815
    A/SA815
    Forged Valves
    A/SA182
    F50
    A/SA182
    F51
    A/SA182
    F60
    A/SA182
    F61
    A/SA182
    F53
    A/SA182
    F55
    Forged Fittings
    A/SA182
    F50
    A/SA182
    F51
    A/SA182
    F60
    A/SA182
    F61
    A/SA182
    F53
    A/SA182
    F55
    Flanges
    A/SA182
    F50
    A/SA182
    F51
    A/SA182
    F60
    A/SA182
    F61
    A/SA182
    F53
    A/SA182
    F55
    Plate
    A/SA240
    A/SA240
    A/SA240
    A/SA240
    A/SA240
    A/SA240
    Bar
    -----
    A/SA479
    A/SA276
    A/SA479
    A/SA276
    A/SA479
    A/SA276
    A/SA479
    A/SA276
    A/SA479
    A/SA276
     
    Cast Steel Valves
    -----
    A890
    A/SA995
    A890
    A/SA995
    A890
    A/SA995
    A890
    A/SA995
    A890
    A/SA995
    ACI (A890 and A/SA995)
    -----
    CD3MN
    CD3MN
    CD4MCuN
    CE3MN
    CD3MWCuN
    Grade (A890 and A/SA995)
    -----
    4A
    4A
    1B
    5A
    6A
    UNS #
    -----
    J92205
    J92205
    J93372
    J93404
    J93380

    * The Following must be included with the ASTM designation and graded for the description to be complete:
    WP (S) = Seamless
    WP (W) = Welded
    WP (WX) = Welded with 100% x-ray
    WP (U) = Welded with 100% Ultrasonic examination
    CR = Corrosion resistant in acordance with MSS SP-43
  • The Duplex ferritic/austenitic alloys are intended for general service in corrosive environments. They exhibit strong resistance to stress corrosion cracking, filling the gap between austenitic stainless and the nickel alloys.

  • Duplex grades UNS S31803 and S32205 are the most common grades. The Chemical Process Industry uses them in sulfuric, nitric and phosphoric acid environments.

  • Several other industries, including oil and gas production, have uses for Duplex material.

  • S31803 and S32205 chemistries are very similar, having the same maximum contents of chrome, nickel, molybdenum and nitrogen. S32205 has higher minimum contents of chrome, molybdenum and nitrogen. Chrome contents are in the twenty one to twenty three per cent range.

  • The super Duplex grades listed have chromium contents ranging from twenty four to twenty seven per cent.

  • Duplex 2507 and Xeron 100 also have nickel contents increased one and one half per cent over S31803 and S32205.

  • Duplex S31200 has chrome and nickel contents in the super Duplex range, but the molybdenum content is significantly less than any of the other five grades.
Information provided in this page is in accordance with the 2013 Edition of the ANNUAL BOOK OF ASTM STANDARDS
Refer to ASME B & PV Code Section II for non-identical A/SA requirements.