Inconel 783

Inconel 783 丨UNS R30783

Inconel 783 an oxidation-resistant low coefficient of thermal expansion (low CTE) superalloy developed for gas turbine applications. The alloy is strengthened by a precipitation-hardening heat treatment made possible by additions of niobium and aluminum. In addition, the aluminum content provides excellent resistance to oxidation at high temperatures. The alloy’s density is 5% less than those of superalloys such as INCONEL alloy 718. The combination of low expansion, high strength, and excellent resistance to oxidation makes the alloy especially useful for gas turbine and steam turbine components. The low expansion enables closer control of clearances and tolerances for greater power output and fuel efficiency.

Inconel 783 / Nickel Alloy 783 / UNS R30783

Applications of Inconel 783:

Nickel alloy-783 is commonly used in gas turbine engine components, such as turbine disks, blades, and fasteners, where high-temperature strength and creep resistance are critical. It finds applications in aerospace, power generation, and other high-temperature industrial environments.

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

Specifications/Standard: AMS 5940

Chemical Composition:

  • Chromium(Cr): 2.5-3.5%

  • Nickel(Ni): 26.0-30.0%

  • Iron(Fe): 24.0-27.0%

  • Niobium(Nb): 2.5-3.5%

  • Aluminum(Al): 5.0-6.0%

  • Cobalt(Co): Balance

  • Boron(B): 0.003-0.012%

  • Carbon(C): 0.03 max.

  • Manganese(Mg): 0.50 max.

  • Silicon(Si): 0.50 max.

  • Phosphorus(P): 0.015 max.

  • Sulfur(S): 0.005 max

  • Titanium(Ti): 0.1-0.4

  • Copper(Cu): 0.50 max

Physical Constants and Thermal Properties:

  • Density: 7.81 g/cm3 or 0.282 lb/in312.

  • Melting point: 1336-1407 °C or 2437-2565 °F2.

  • Thermal expansion co-efficient (at 93°C/200°F): 10.08 µm/m°C or 5.60 µin/in°F2.

  • Thermal conductivity (at 21°C/70°F): 10.1 W/m-°C or 71 BTU in/hr.ft².°F2.

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