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INCONEL 925

Inconel 925 is a nickel-iron-chromium alloy with molybdenum, copper, titanium, and aluminium added. The chemical composition of the alloy is optimised to provide a balance of high strength and corrosion resistance. Nickel provides resistance to chloride-iron stress corrosion cracking and, when combined with molybdenum and copper, provides exceptional resistance to reducing chemicals.

Molybdenum helps prevent pitting and crevice corrosion, while chromium helps resist oxidising environments. Titanium and aluminium are both components of the precipitation hardening reaction, which significantly increases the alloy's hardness and strength.



Corrosion resistance is excellent, and the alloy is resistant to general corrosion, pitting, crevice corrosion, intergranular corrosion, and stress corrosion cracking. It is particularly useful in sour crude oil, natural gas, sulphuric acid, phosphoric acid, and seawater that contain hydrogen sulphide.




Characteristic :

  •  Age hardenable Nickel Iron Chromium alloy
  •  High strength and excellent corrosion resistance
  •  Hot worked, solution annealed and aged


Specification :

  •  UNS N09925
  •  NACE MR-0175/ISO1515
  •  Schlumberger Specification CMS-Z1KGK
    Material may also be supplied to Customer specifications, subject to enquiry.


Chemical Analysis :


C Mn P S Si Ni Cr Mo Ai Ti Nb Cu Fe -
Min - - - - - 42.0 19.5 2.5 0.1 1.9 - 22.0 1.5 %
Max 0.03 1.0 0.03 0.03 0.5 46.0 22.5 3.5 0.5 2.4 0.5 - 3.0 %


Mechanical Properties :


Tensile PSI (MPA) min Yield (0.2% offset), PSI (MPA) Min Elongation in 2" or 4D min% Reduction of Area min% Charpy Impacts at - 60◦C (-75◦F)J (ftlb) Rockwell hardness HRC
140,000 (965) 110,000 (758) 18 20 Single Min 43(32) Average min 47 (35) 30-38


APPLICATION :


    Incoloy 925 is ideally suited to down-hole and surface gas well components such as :

  • Valves
  • Hangers
  • Fasteners
  • Nipples
  • Tool joints
  • Packers
Work Process

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