Inconel Alloy 690

  • Resistance to heated nitric acid with fluoride
  • Top-notch mechanical properties & high ductility
  • Resistance to sulphidation, oxidation, & metal dusting
  • Doesn’t crack from stress corrosion by alkalis
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Created from a unique combination of nickel-iron-chromium, the Inconel Alloy 690 is perfect to be used in different types of oxidizing media. It houses an approximate of 30% chromium, which caters it an excellent aqueous media resistance.

This alloy has amazing resistance to several variants of corrosive media when kept at high temperatures. It possesses excellent fabrication characteristics & high rupture strength. The presence of a high amount of nickel ensures there is minimal to zero cracking from stress-corrosion.

Common Names:

  • UNS N06690
  • Alloy 690
  • Nr.2.4642
  • ISO NW6690

Executive Standards:

Bar, Rod, Forging Stock, & Wire

  • ASTM B166
  • ASME SB 564
  • MIL-DTL-24801
  • ASME SB 166
  • ISO 9723
  • ASTM B 564
  • ASME Code Case N-525

Seamless Tube & Pipe

  • ASTM B 163
  • ASME SB 167
  • ASME SB 163
  • ASME SB 829
  • ASTM B 167
  • ISO 6207
  • MIL- DTL-24803
  • N- 20, N-525
  • ASTM B 829
  • ASME Code Cases 2083

Strip, Plate, & Sheet

  • ISO 6208
  • ASME SB 168
  • ASTM B168
  • ASME N-525
  • MIL-DTL-24802

Chemical Properties:

Chromium (%)27.0 to 31.0
Nickel (%)58.0 Minimum
Carbon (%) 0.05 Maximum
Iron (%)7.0 to 11.0
Silicon (%)0.50 Maximum
Sulfur (%)0.015 Maximum
Manganese (%)0.50 Maximum
Copper (%)0.50 Maximum

Mechanical Properties:

Yield StrengthKsi35 Minimum
MPa240 Minimum
Tensile StrengthKsi86 Minimum
MPa590 Minimum
Elongation %30 Maximum

Physical Properties:

Specific HeatBtu/lb-°F0.107
Melting Range°F2450 to 2510
°C1343 to 1377
Permeability200 Oersteds1.001
Electrical Resistivityohm-circ mil/f69.1
Young’s ModulusKsi30.6 x 103
Poisson’s Ratio0.289

Key Features:

  • Machinability: Inconel 690 is easily machinable with the use of conventional machining that is performed by bringing in commercial coolants.
  • Weldability: Inconel Alloy 690 is welded with the use of metal-arc, gas-tungsten arc, gas-metal arc, as well as submerged-arc.
  • Easy Hardening: Inconel 690 has been designed to be hardened easily for industrial usage. It generally requires the use of a cold working process to be hardened.

Product Forms Available:

  • Rod
  • Bar
  • Forging Stock
  • Wire
  • Tube
  • Pipe
  • Strip
  • Plate
  • Sheet


  • Furnaces
  • Duct Work
  • Burners (High Temperature)
  • Petrochemical Heaters

Possible Alternative Grades:

  • Incoloy 800:

When kept at elevated temperatures, Incoloy 800 offers oxidation resistance, sulfidation, as well as carburization.

  • Inconel 600:

When used at standard operating temperature, Inconel 60 is an optimum alternative for Inconel 690 with lower thermal conductivity.

  • Inconel 617:

This strengthened & solid solution alloy brings in exceptional oxidation resistance & strength in elevated temperatures.

Frequently Asked Questions:

  • How is Alloy 690 different from austenitic SS?

The Alloy 690 flaunts a higher rate for work hardening as compared to the austenitic SS, which is why it should always be cold worked post-annealing.

  • How does the Alloy 690 work in acidic mediums?

The Alloy 690 shows exceptional resistance to mixtures that include hydrofluoric and nitric acid.

  • How to ensure stable machining for Alloy 690?

Heat dissipation via the use of suitable quantity aqueous lubricants ensures highly-stable machining for the alloy 690.

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