The newest of the high-performance superalloys invented by Special
Metals Corporation, INCONEL® alloy 783
(UNS R30783/U.S. Patent 5,478,417), is an oxidation-resistant, low
expansion, nickel-cobalt-iron alloy with
aluminum, chromium, and niobium additions.The new alloy is of
considerable interest to aircraft gas turbine engine
designers and materials engineers for containment and clearance
control components such as rings, casings, shrouds
and seals for compressors, turbines and exhaust systems. The
three-phase age hardenable alloy offers a range of
improvements for these applications over alternative alloys in
current use:
A coefficient of thermal expansion approximately 20% lower than
that of INCONEL alloy 718.
Excellent resistance to oxidation, demonstrated in cyclic tests, at
temperatures up to and beyond 1300°F (704°C).
Resistance to SAGBO (stress accelerated grain boundary oxidation)
comparable to that of INCONEL alloy 718,
and significantly better than that of INCOLOY alloy 909.
A density of 0.282 lb/in3(7.81 g/cm3), 5% less than INCONEL alloy
718 or INCOLOY® alloy 909,
contributing to an important potential improvement in
strength-to-weight ratios.
Manufacturing/processing characteristics comparable to those of
INCONEL alloy 718, and less limiting than
those of INCOLOY alloy 909.
Special Metals’ INCONEL alloy 783 is available as forging billet
(AMS 5940), rod and bar for machining,
extruded section, and wire rod. Sheet product is currently under
development.
Table 1 - Limiting Chemical Composition*, %
Chromium......................................................................
2.5-3.5
Nickel
.........................................................................26.0-30.0
Iron
..............................................................................24.0-27.0
Niobium...........................................................................2.5-3.5
Aluminum........................................................................5.0-6.0
Cobalt........................................................................Remainder
Boron.......................................................................0.003-0.012
Carbon........................................................................0.03
max.
Manganese.................................................................0.50
max.
Silicon.........................................................................0.50
max.
Phosphorus..............................................................0.015
max.
Sulfur
.........................................................................0.005
max
Titanium...........................................................................0.1-0.4
Copper.........................................................................0.50
max
Physical Properties
Table 2 - Physical Constants
Density,
g/cm3....................................................................7.81
lb/in3...................................................................0.282
Melting Range, °F
.....................................................2437-2565
°C ....................................................1336-1407
Specific Heat, Btu/lb•°F
(77°F)..........................................0.109
J/kg•°C (25°C)..............................................455
We can provide Inconel 783 material in the form of flange,
fittings, pipes, fasteners.
