Inconel 690 (UNS N06690 / W.Nr. 2.4642)

Inconel 690 (UNS N06690 / W.Nr. 2.4642) is a high-chromium nickel alloy with excellent resistance to many corrosive aqueous media and high-temperature atmospheres. The alloy’s high chromium content gives it excellent resistance to aqueous corrosion by oxidizing acids (especially nitric acid) and salts, and to sulfidation at high-temperatures.

Equivalent Grades

Inconel 690NS3105
Inconel 690N06690NiCr29Fe2.4642NiCr29FeNiCr29Fe

Chemical Composition, %

Inconel 690≤0.05≤0.50≤0.50≤0.02≤0.01527.0-31.0≥58.0≤0.507.0-11.0

Typical Physical and Mechanical Properties (RT, Solution annealed)

Density, g/cm3Melting Point, ℃Tensile Strength, MPaYield Strength, MPaELongation, %Hardness, HRB

Available Products and Specifications

Rod, Bar, Wire and ForgingsASTM B166/ASME SB166, ASTM B564/ASME SB564, ISO 9723(Rod, Bar)
Plate, Sheet and StripASTM B168/ASME SB168, ASTM B906/ASME SB906, (Plate, Sheet, Strip), ISO 6208
Pipe and TubeASTM B163/ASME SB163/ASTM B167/ASME SB167/ASTM B829/ASME SB829, ISO 6207(Tube)
Welding ProductInconel Filler Metal 52-AWS A5.14/ERNiCrFe-3; Inconel Welding Electrode 152-AWS A5.11/ENiCrFe-7
OthersASTM B366/ASME SB366(Fittings), DIN17744


  • Excellent inoxidability in the high temperature.
  • Good resistance to carbonizing.
  • Good inoxidabilitiy in sulfur atmosphere
  • Good mechanical property in both room temperature and high temperature.
  • Good resistance to stress corrosion cracking, 690 have high creep rupture strength since it limits the carbon content and grain size, so recommend to use for above 500℃ environment.


  • The tray,basket and tool clamp in the heat treatment factory.
  • Steel shares at annealing and radiation control, high-speed gas burners, Industrial furnace silk screen.
  • Separate tank of ammonia reforming and catalytic support grid of nitric acid producing.
  • Exhaust system parts
  • Solid waste incinerator’s combustion chamber
  • Channel support and soot dealing parts.