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Special Metals Corporation

Special Metals Corporation
3200 Riverside Drive ,
Huntington ,
WV 25705
USA
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Nimonic - Model 80A - High Performance Alloys

- Model 80A - High Performance Alloys

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NTMONTC* 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. Electroslae refined material is used for forms to be forged. Vacuum refined versions are also available. NTMONIC 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. The alloy's limiting chemical composition is given in Table 1 (as in British Standard HR1, 201, 401 and 601).

Products Details

Physical Properties
Some physical properties for NTMONIC alloy 80A are given in Table 2. The density was determined on extruded bar, subsequently forged, and extruded section, subsequently cold rolled, given a heat treatment of 8 hours/1080°C (1976°F)/air cool - 16 hours.700°C (1292°F)/air cool.

The liquidus temperature was determined by inverse cooling techniques, and the solidus by metallographic examination. The accuracy of determination was ±5°C (9°F) for the liquidus temperature and +0, -10°C (18°F) for the solidus.

The magnetic property results were obtained from 4 casts of cold rolled sheet, heat treated 2-3 minutes'1150°C (2102°F)'fluidized bed quenched + 20 minutes'1040°C (1904°Fyair cooled + 4 hours/750°C (1382°F)/air cooled.

The specific heat data in Table 3 are calculated values, using the L.R. Jackson equation. The thermal conductivity data (Table 4) were calculated from electrical resistance measurements on 4 fully heat treated specimens using the modified Wiedermann-Franz equation obtained by R.W. Powell. The material was cold rolled sheet, heat treated 2-3 minutes'1150°C  (2102°F>fluidized bed quenched + 1 hour/925°C (1697°F)/air cooled - 4 hours'750°C (1382°F)/air cooled.

Linear thermal expansion data (Table 5) were obtained from 5 casts of as-extruded section, subsequently cold rolled.
The electrical resistivity data in Table 6 were obtained from 4 casts of cold rolled sheet, heat treated 2-3 minutes'1150°C (2102°F)/fluidized bed quenched + 1 hour/925°C (1697°F)/air cooled + 4 hours/750°C (1382°F)/air cooled.

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