Project Description

Inconel 625 (UNS N06625)

Inconel 625 (UNS N06625) 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

Inconel 625GH3652
NCF 625Inconel 625N06625NiCr22Mo9Nb2.4856NiCr22Mo9Nb
NA21 NA 43

Product Forms

Pipe, Tube, Sheet, Strip, Plate, Round Bar, Flat Bar, Forgings, Hexagon, Wire

Chemical Composition,%


Typical Physical & Mechanical Properties (RT, Solution Annealed)

Density, g/cm3Melting Point, ℃Tensile Strength, MPaYield Strength, MPaElongation,%
Density, g/cm3Melting Point, ℃Tensile Strength, MPaYield Strength, MPaElongation,%


Rod, Bar, Wire, 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, 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, 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)
OthersASTM B366/ASME SB366(Fittings), DIN17744
Welding ProductsInconel Filler Metal 625-AWS A5.14/ERNiCrMo-3


  • 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


  • 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