NIMONIC alloy 80A (UNS N07080/W. Nr. 2.4952 &
2.4631) is a wrought, age-hardenable nickel-chromium
alloy, strengthened by additions of titanium, aluminum
and carbon, developed for service at temperatures up to
815°C (1500°F). It is produced by high-frequency
melting and casting in air for forms to be extruded.
Electroslag refined material is used for forms to be
forged. Vacuum refined versions are also available.
NIMONIC alloy 80A is currently used for gas turbine
components (blades, rings and discs), bolts, nuclear
boiler tube supports, die casting inserts and cores, and
for automobile exhaust valves.
Table 1 - Limiting Chemical Composition, % Nickel (+ Cobalt) ..........................................................70.0 min. Chromium....................................................................14.0-17.0 Iron ..................................................................................5.0-9.0 Titanium...........................................................................2.0-2.6 Aluminum ........................................................................0.9-1.5 Niobium (+ Tantalum) ......................................................0.7-1.2 Manganese ...................................................................1.0 max. Silicon ...........................................................................0.5 max. Sulfur ..........................................................................0.01 max. Copper..........................................................................0.5 max. Carbon........................................................................0.10 max.
Physical Properties
The following table discusses the physical properties of NIMONIC alloy 80A.
Properties |
Metric |
Imperial |
| Density |
8.19 gm/cm3 |
0.296 lb/in3 |
Mechanical Properties
The mechanical properties of NIMONIC alloy 80A are tabulated below.
Properties |
Metric |
Imperial |
| Tensile strength(annealed) |
1250 MPa |
181 ksi |
| Yield strength(annealed) |
780 MPa |
113 ksi |
| Elongation at Break |
30% |
30% |
Other Designations
Some of the other designations that are used to denote NIMONIC alloy 80A are as below:-
UNS N07080
BS 3076
HR1
HR401
HR601
HR201
ASTM B637
DIN 17742
DIN17754
Fabrication
Machinability
The conventional machining techniques used on iron alloys may be used for this alloy. This alloy work-hardens during machining.
Welding
NIMONIC alloy 80A can be welded using common techniques, using a matching filler metal. A prerequisite for welding is that the metal should be solution treated. Fusion welding by tungsten inert gas welding and metal inert gas welding will be suitable for this alloy.
Hot working
NIMONIC alloy 80A can be hot worked at temperature ranges of 1050-1200°C (1920-2190°F).
Forging
NIMONIC alloy 80A can be hot forged at temperatures in the range of 982-1176°C (1800-2150°F).
Cold working
Cold working may be done on the alloy.
Annealing
NIMONIC alloy 80A should be annealed at 1079°C (1975°F) for about 8 hours and air cooled.
Applications
The NIMONIC alloy 80A is used in the following applications:
Gas turbine engineering
Automobile exhaust valves
Die-casting inserts and cores
Nuclear boiler tube parts.
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