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    Introduction of Alloy UNS S31254/1.4547/6MO/ F44 Corresponding Standards: UNS S31254, EN 1.4547, ASTM A182 Grade F44

    UNS S31254 is an austenitic stainless steel with low carbon content which reduces the possibility of precipitation of chromium carbides in the sensitization temperature range. The alloy stainless steel pipe.contains elevated nitrogen, chromium, nickel, and 6% to 6.5% molybdenum by weight. The nitrogen addition provides higher yield and tensile strengths, however the alloy is readily cold worked. S31254 exhibits excellent resistance to uniform corrosion and good resistance to pitting corrosion. The nickel and molybdenum contents of S31254 result in improved stress corrosion cracking resistance compared to other austenitic stainless pipe.

     Chemical Composition

    WEIGHT%

    C

    SI

    MN

    S

    P

    CR

    NI

    MO

    N

     CU

    MIN.




     19,50

     17,50

     6,00

     0,18

     0,50

    MAX

     0,020

     0,80

     1,00

     0,010

     0,030

     20,50

    18,50 6,50

     0,22

     1,00

    Mechanical Properties

    YIELD STRENGTH
    RP0.2
    MPA

    TENSILE STRENGTH
    RM
    MPA

    ELONGATION
    [%]

    HARDNESS
    [HB]

    IMPACT
    CHARPY-V, -46ºC
    [J]

    PRE

     

     ≥ 300

     650 – 850

     ≤ 260

     ≥ 35

      ≥ 45

     ≥ 40


     Heat Treatment

    Solution annealing at min 1150°C followed by water quenching

    Weldability

    Very good.

    Applications:

    • High resistance to general corrosion.
    •Typical applications: Pumps, valves, chokes, pipe work/flanges and manifolds in oil and gas industry.

    ss 304 seamless pipess 304 seamless pipe