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Inconel 783(UNS R30783)
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Inconel 783(UNS R30783)1.Inconel 783 INTRODUCTION 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. 2.Inconel 783 STANDARD PRODUCT FORMS Sheet, round bar, wire and extruded section. 3.Inconel 783 MAJOR SPECIFICATIONS UNS R30783 SAE AMS 5940 4.Inconel 783 LIMITING CHEMICAL COMPOSITION, % Ni......26.0 – 30.0 Fe..... 24.0 – 27.0 Co......Remainder Al ...........5.0 – 6.0 Nb .........2.5 – 3.5 Cr ..........2.5 – 3.5 Ti ...........0.1 – 0.4 B...0.003 – 0.012 C............ 0.3 max. Cu........0.50 max. Mn.......0.50 max. P....... 0.015 max. S....... 0.005 max. Si.........0.50 max. 5.Inconel 783 PHYSICAL CONSTANTS AND THERMAL PROPERTIES Density, Ib/in3 (g/cm3)........................................... 0.282 (7.81) Melting Range, °F (°C).............2437 – 2565 (1336 – 1407) Specific Heat, Btu/lb•°F (J/kg•°C)......................0.109 (455) Coefficient of Expansion, 10-6 in/in•°F (μm/m•°C) 70-200°F (21–93°C)..................5.60 (10.08) 70-500°F (21–260°C) ...............5.74 (10.94) 70-800°F (21–427°C) ...............6.08 (10.67) 70-1000°F (21–538°C).............6.57 (11.83) 70-1200°F (21–650°C)............. 7.15 (12.87) Thermal ConductivityA , Btu•in/ft2•h•°F (W/m•°C)....70.9 (10.2) Electrical ResistivityA , ohm•circ mil/ft (μΩ•m)....615 (1.021) Young’s ModulusA , 106 psi (GPa)............................ 26.8 (185) Shear’s ModulusA , 106 psi (GPa)................................. 9.7 (67) Poisson’s RatioA...................................................................... 0.38 HardnessA , HRC ................................................................30 – 38 A Room temperature, as aged. 6.Inconel 783 TYPICAL MECHANICAL PROPERTIES
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