UNS N07725 (Inconel 725)

Short Introduction:

  • Inconel 725  / UNS N07725 is highly resistant to corrosion and is age hardenable for extremely high strength. The strength of this alloy is developed by heat treatment to achieve high ductility and toughness. The alloy is resistant to hydrogen embrittlement and stress-corrosion cracking.

    Category:

    Description

    UNS N07725/Inconel 725

     Inconel 725 Material grades and equivalents Trademark Inconel 725 /UNS N07725

     

    UNS N07725/Inconel 725 is a nickelchromium-molybdenum-niobium alloy that is highly resistant to corrosion and is age hardenable for extremely high strength. It has essentially the same corrosion resistance as INCONEL alloy 625, which is widely used in a broad range of severely corrosive environments. The strength of age-hardened INCONEL alloy 725 is of the order of twice that of annealed alloy 625. Because the strength of alloy 725 is developed by heat treatment, not by cold work, ductility and toughness remain high. Also, strength can be imparted to large or non-uniform sections that cannot be strengthened by cold work.  High levels of nickel and chromium provide corrosion resistance in reducing and oxidizing environments. The substantial molybdenum content enhances resistance to reducing media and provides a high degree of resistance to pitting and crevice corrosion. Additionally, the combination of elements makes the alloy resistant to hydrogen embrittlement and stresscorrosion cracking. The properties of INCONEL alloy 725 are useful for a range of applications that require outstanding corrosion resistance along with high strength. The alloy is used for hangers, landing nipples, side pocket mandrels and polished bore receptacles in sour gas service, where it resists the effects of hydrogen sulfide, chlorides and carbon dioxide. The alloy is also attractive for high strength fasteners in marine applications, where it resists corrosion, pitting and crevice attack in sea water.

    Inconel725 Chemical composition:

    Alloy

    %

    Ni

    Cr

    Mo

    Al

    Ti

    Fe

    Nb

     Inconel 725

    Min.

    55

    19

    7

    1

     balance

    2.75

    Max.

    59

    22.5

    9.5

    0.35

    1.7

    4

     

    Inconel725 Characteristic as below:

    A nickel-chromium-molybdenum-niobium alloy that is highly resistant to corrosion and is age hardenable for extremely high strength. The strength of this alloy is developed by heat treatment to achieve high ductility and toughness. The alloy is resistant to hydrogen embrittlement and stress-corrosion cracking.

    Inconel 725 Application field :

    Used for hangers, landing nipples, side pocket mandrels and polished bore receptacles in sour gas service. Also used for high-strength fasteners in marine applications.

    Specifications:

    ASTM B 805 /ASME Code Case 2217

    Bar and wire: