NIMONIC alloy 80A 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.
Weight % | C | Cr | Si | Cu | Fe | Mn | Ti | Al | Co | B | Zr | Pb | S | Ni |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Minimum | — | 18.0 | — | — | — | — | 1.8 | 1.0 | — | — | — | — | — | Bal |
Maximum | 0.10 | 21.0 | 1.0 | 0.2 | 3.0 | 1.0 | 2.7 | 1.8 | 2.0 | 0.008 | 0.15 | 0.0025 | 0.015 |
Characteristics | English | Metric | |
---|---|---|---|
Nominal density | 20°C / 68°F | 0.296 lbs/in3 | 8.19 g/cm3 |
Melting range | 2410-2490 °F | 1320-1365 °C | |
Specific heat | 21°C / 70°F | 0.107 BTU/lb – °F | 448 J/KG- °K |
Average coefficient of thermal expansion
From 70°F to temperature, heat treated 8 hours/ 1080°C (1976°F)/ air cooled + 16 hours / 700°C (1292°F)/ air cooled. |
100°C / 212°F | 7.31 micro in/in- °F | 13.2 micro m/m- °K |
300°C / 572°F | 7.53 micro in/in- °F | 13.6 micro m/m- °K | |
500°C / 932°F | 7.74 micro in/in- °F | 13.9 micro m/m- °K | |
700°C /1292°F | 7.97 micro in/in- °F | 14.3 micro m/m- °K | |
900°C /1652°F | 8.39 micro in/in- °F | 15.1 micro m/m- °K | |
Thermal conductivity | 100°C / 212°F | 6.71 BTU/ft- hr – °F | 11.6 W/m – °K |
300°C / 572°F | 9.31 BTU/ft- hr – °F | 16.1 W/m – °K | |
500°C / 932°F | 11.2 BTU/ft- hr – °F | 19.4 W/m – °K | |
700°C /1292°F | 12.9 BTU/ft- hr – °F | 22.3 W/m – °K | |
900°C /1652°F | 15.3 BTU/ft- hr – °F | 26.5 W/m – °K |
Condition | Tensile | ||||
---|---|---|---|---|---|
Ultimate | Yield | Elongation in 50 mm (2 in.) | |||
KSI | MPa | KSI | MPa | % | |
Precipitation Hardened.
Value at room temperature |
181 | 1250 | 113 | 780 | 30 |
Precipitation Hardened prior to
test 650°C (1200°F) |
149 | 1030 | 103 | 710 | 30 |