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ALLOY 625

Alloy 625 is a nickel-chromium alloy which gains its stiffening effect through molybdenum and niobium additions, therefore eliminating the need for this alloy to be aged. It has superior resistance to a wide range of corrosive environments as well as the high temperature effects of oxidation and carburisation.




Alloy 625 is excellent for sea-water applications, having freedom from pitting and crevice corrosion, high corrosion fatigue strength and resistance to chloride-ion stress corrosion cracking.




This alloy also has high tensile, creep and rupture strength, fatigue and thermal fatigue strength and oxidation resistance, making it suitable for aircraft engine exhaust systems, housing engine controls and aircraft ducting systems. It is also used in the nuclear field for reactor cores, control rod components in nuclear water reactors.


Characteristic :

  •  Nickel Chromium alloy
  •  Available in hot worked and annealed condition
  •  High strength and outstanding corrosion resistance
  •  Range of service temperatures from cryogenic to 980°C
  •  Excellent weldability
  •  Commonly referred to as Inconel® 625


Specification :

  •  ASTM B164/564 (2019)
  •  BS 3076 NA21 (1989)
  •  UNS N06625
  •  AMS 5666 (Currently Rev J)
  •  NACE MR0175/ISO15156
  •  Werkstoff Nr. 2.4856


Chemical Analysis :


C Mn Si P S Cr Ni Co Ti Ai Mo Nb + Ta Fe -
Min - - - - - 20.0 58.0 - - - 8.0 3.15 - %
Max 0.10 0.50 0.50 0.15 0.15 23.0 - 1.0 0.40 0.40 10.0 4.15 5.0 %


Mechanical Properties :


Typical properties for Annealed Grade 1 up to 100mm section:

Tensile (PSI (MPA)) Yield (0.2% offset), (PSI (MPA) Min) Elongation in 2" or 4D min% Reduction of Area Rockwell Hardness HRC Max Charpy Impacts at - 70◦C Joules (ftlb) min
120,000(827) 60,000(413) 30 35 35 Average 42 (31) Single 33(25)


APPLICATION :


  • Transition liners
  • Propeller blades
  • Seals
  • Fasteners
  • Pumps
  • Turbine shroud rings
  • Heat exchanger tubing
  • Reaction vessels
  • Distillation columns
  • Heat exchangers
  • Valves
Work Process

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