Inconel 625 (UNS N06625 / W.Nr. 2.4856)

Inconel 625 (UNS N06625 / W.Nr. 2.4856) is a nickel-chromium-molybdenum alloy with an addition of niobium that acts with the molybdenum to stiffen the alloy’s matrix and thereby provide high strength without a strengthening heat treatment. The alloy resists a wide range of severely corrosive environments and is especially resistant to pitting and crevice corrosion. Used in chemical processing, aerospace and marine engineering, pollution-control equipment, and nuclear reactors.

Equivalent Grades

TrademarkGBGOSTASTMUNSDINW.Nr.NFBSJISSS
Inconel 625GH3625
NS3306
NS336
Inconel 625N06625NiCr22Mo9Nb2.4856NiCr22Mo9NbNiCr22Mo9Nb
NA21
NA43
NCF 625

Chemical Composition, %

AlloyCSiMnPSCrNiCoMoAlTiFe
Inconel 625≤0.10≤0.50≤0.50≤0.020≤0.01520.0-23.0≥58.0≤1.08.0-10.0≤0.40≤0.40Bal

Typical Physical and Mechanical Properties (RT, Annealed)

Density, g/cm3Melting Point, ℃Tensile Strength, MPaYield Strength, MPaELongation, %Hardness, HRB
8.441290-1350827-1034414-65530-60/

Available Products and Specifications

Rod, Bar, Wire and ForgingsASTM B446/ASME SB446(Rod, Bar), ASTM B564/ASME SB564(Forgings), DIN 17752(Rod, Bar)/17753(Wire)/17754(Forgings), ISO 9723(Rod, Bar)/9724(Wire)/9725(Forgings)
Plate, Sheet and StripASTM B443/ASME SB443(Plate, Sheet, Strip), DIN 17750(Plate, Strip, Sheet), ISO 6208(Plate, Sheet, Strip), EN10095(Plate, Sheet, Strip), DIN 17750(Plate, Sheet, Strip)
Pipe and TubeASTM B444/ASME SB444/ASTM B829/ASME SB829(Pipe, Tube), ASTM B704/ASME SB704/ASTM B751/ASME SB751/ASTM B705/ASME SB705/ASTM B775/ASME SB775(Welded Tube), DIN 17751(Tube), ISO 6207(Tube)
Welding ProductInconel Filler Metal 625-AWS A5.14/ERNiCrMo-3
OthersASTM B366/ASME SB366(Fittings), DIN17744

Features

  • High creep-rupture strength
  • Oxidation resistant to 1800°F
  • Good fatigue resistance
  • Excellent weldability
  • Outstanding resistance to chloride pitting and crevice corrosion
  • Immune to chloride ion stress corrosion cracking
  • Resistant to seawater under both flowing and stagnant conditions and under fouling

Applications

  • Aircraft ducting systems
  • Jet engine exhaust systems
  • Engine thrust-reverser systems
  • Bellows and expansion joints
  • Turbine shroud rings
  • Flare stacks
  • Seawater components
  • Chemical process equipment handling mixed acids both oxidizing and reducing