Inconel 690 flat rods

Inconel 690丨UNS N06690

Nickel alloy Inconel 690,  also known as UNS N06690, 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. In addition to its corrosion resistance, alloy 690 has high strength, good metallurgical stability, and favorable fabrication characteristics.

Inconel 690 / UNS N06690 / W.Nr 2.4642

Applications of Inconel 690:

Inconel 690 is used in a wide range of scenarios involving nitric or nitric/hydrofluoric acid solutions. Examples include tail-gas reheaters utilized in nitric acid production, heating coils, and tanks for nitric/hydrofluoric solutions used in the pickling of stainless steels and reprocessing of nuclear fuels. Additionally, it is employed in coal-gasification units, burners, and ducts for processing sulfuric acid, as well as furnaces for petrochemical processing. Other applications include its use in recuperators, incinerators, and glass vitrification equipment for the disposal of radioactive waste. Alloy 690 is extensively utilized in nuclear power generation for steam generator tubes, baffles, tube sheets, and hardware.

Normal product forms: rods, bars, wires, pipes, tubes, plates, sheets, strips, and forgings.

Specifications/Standard:  ASTM B 163, B 166 – B 168, B 564, B 829, ASME SB-163, SB-166 – SB-168, SB-564, SB-829

Chemical Composition:

  • Nickel (Ni) + Cobalt (Co): 58.0% min.

  • Chromium (Cr): 27.0-31.0%

  • Iron (Fe): 7.0-11.0%

  • Carbon (C): 0.05% max.

  • Silicon (Si): 0.50% max.

  • Manganese (Mn): 0.50% max.

  • Sulfur (S): 0.015% max.

  • Copper (Cu): 0.50% max.

Physical Constants and Thermal Properties

  • Density: 8.19 g/cm³

  • Thermal expansion coefficient (at 24-100°C/75.2-212°F): 14.06 µm/m°C

  • Thermal conductivity: 13.5 W/mK

Mechanical Property:

  • Tensile strength: 724 MPa

  • Yield strength (@strain 0.2%): 348 MPa

  • Modulus of elasticity: 211 GPa

  • Shear modulus: 81.8 GPa

  • Poisson’s ratio: 0.289

  • Elongation at break: 41%

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