F44 Steel ( UNS S31254 / 1.4547 )

Short Introduction:

  • F44 ( UNS S31254 / 1.4547 ) super austenitic steel combines moderate tensile strength and high ductility with excellent corrosion resistance in seawater and variety of industrial environment. Typically the alloy has PREN of 42 – 44, which ensure that the resistance to pitting corrosion is high and it also has a hight resistance to crevice corrosion.


    F44 Steel ( UNS S31254 / 1.4547 )

    Material grades and equivalents:UNS S31254 / 1.4547 / F44 / 254SMO / 00Cr20Ni18Mo6CuN

    Special properties:

    Material to F44 Steel ( UNS S31254 / 1.4547 ) is described as a 6% Mo super austenitic stainless steel. The steel combines moderate mechanical strength (typically over 300 MPa yield strength) and high ductility with excellent corrosion resistance in seawater and a variety of industrial environments. Typically the alloy has a PREn (Pitting Resistance Equivalent) of 42-44 which ensures that the resistance to pitting corrosion is high. In addition, the steel provides good resistance to crevice corrosion. Ambient and subzero temperature notch ductility is very good. These attributes mean that this high molybdenum stainless steel can be used successfully as an alternative to 300 series austenitic stainless steels (such as type 316) in applications where higher mechanical strength and/or enhanced resistance to pitting and crevice corrosion is required. This alloy possesses a lower yield strength than that of duplex stainless steel (and much lower than that of super duplex steel) and pitting resistance which is comparable to super duplex stainless steel (such as UNS S32760 / S32750).

    F44 Duplex Stainless Steel Chemical composition:

    Weight %




























    F44 Duplex Stainless Steel Mechanical Properties:

    UNS S31254



    Yield strength Rp0.2,

    Tensile strength Rm,



    Impact, Charpy-V, -46ºC







     ≥ 310

     655 – 850

     ≥ 35

     ≤ 310

     ≥ 45

     ≥ 40

    F44 Duplex StainlessSteel Physical properties:

    Modulus Elasticity

    Thermal Conductivity

    Specific Heat


    Melting Range













    F44 Duplex Stainless Steel ASTM Specifications:

    Product Form


    Plate, Sheet, Strip

    ASTM A240,A480

    Bar, Billet

    ASTM A276, A479

    Seamless and Welded Pipe

    ASTM A312, A358, A409, A813, A814

    Seamless and Welded Tube

    ASTM A249, A269, A270

    Fittings, Forgings

    ASTM A182, A403, A473

    Bolting, Nuts

    ASTM A193, A194


    ASTM A351, A743, A744

    *F44 is designated differently in different product forms: for wrought pipe fittings, it is ASTM A403 WPS31254; for forgings, it is ASTM A182 F44; for castings, it should be CK3MCuN or UNS J932

    Corrosion Resistance

    F44 Super Austenitic Stainless Steel offers higher resistance to abrasion, erosion and cavitation erosion than other austenitic stainless grades such as 316. F44 Super Austenitic Stainless Steel has excellent resistance to corrosion in sea water and concentrated halide environments, with good resistance to crevice corrosion in seawater.


    F44 Super Austenitic Stainless Steel is readily weldeable with welding procedures used for other austenitic stainless steel specifications. Welding should be carried out at the lowest heat possible as due to its austenite structure it can be prone to hot cracking.

    Mill′s test certificate

    EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.

    F44 Steel ( UNS S31254 / 1.4547 ) Duplex Stainless Steel Applications

    • F44 Steel ( UNS S31254 / 1.4547 ) is mainly used in medium environments that are prone to pitting and crevice corrosion. In the bleaching section of pulp production, it is used to manufacture filters, reactors, ventilation devices, etc.; in nonferrous metallurgy, coal-fired power stations and pulp production, it is used to manufacture cleaning equipment components; it is used to manufacture containers, pipelines, etc. in seawater treatment environments ; In petrochemical and other chemical processing industries, it is used to make reactors, pipelines, pumps, valves, etc. for handling halogen-containing compound media.

    Shanghai HY Industry Co., Ltd has international first-class material production equipment such as high temperature alloy isothermal forging production line, CONSARC vacuum melting furnace, VAR vacuum arc remelting furnace etc., with strong professional ability and highly responsible management team. We are a member of China Application of nuclear energy materials, Member of the International Council of the Aeronautical Sciences,China Electronic Materials Industry Association Magnetic Materials Branch. Years of experience in special alloy. When you have superalloy material inquiry, please contact us without hesitation. Shanghai HY Industry Co., Ltd is Corrosion & fatigue nickel alloy professional manufacturer,We will provide you with sincere and thoughtful service.

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