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Alloy 718 is a high-strength, corrosion-resistant nickel chromium material used at -423° to 1300°F. The age-hardenable alloy can be readily fabricated, even into complex parts. Its welding characteristics, especially its resistance to post-weld cracking, are outstanding. The ease and economy with which INCONEL alloy 718 can be fabricated, combined with good tensile, fatigue, creep, and rupture strength, have resulted in its use in a wide range of applications. Examples of these are components for liquid fueled rockets, rings, casings and various formed sheet metal parts for aircraft and land-based gas turbine engines, and cryogenic tankage. It is also used for fasteners and instrumentation parts.
| Weight % | Ni +Co | Cr | Fe | Nb +Ta | Mo | Ti | Al | Co | C | Mn | Si | P | S | B | Cu |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Minimum | 50.0 | 17.0 | Bal | 4.75 | 2.80 | 0.65 | 0.20 | — | — | — | — | — | — | — | — |
| Maximum | 55.0 | 21.0 | 5.50 | 3.30 | 1.15 | 0.80 | 1.00 | 0.08 | 0.35 | 0.35 | .015 | .015 | .006 | 0.30 |
| Characteristics | English | Metric | |
|---|---|---|---|
| Nominal density | 20°C / 68°F | 0.296 lbs/in3 | 8.19 g/cm3 |
| Melting range | 2300-2437 °F | 1260-1336 °C | |
| Specific heat | 21°C / 70°F | 0.104 BTU/lb – °F | 435 J/KG- °K |
| Average coefficient of thermal expansion
from 70°F to temperature shown, Annealed 1750°F/1 hr and aged 1325°F/8 hr, F.C. to 1150°F/8 hr, A.C. |
93°C / 200°F | 7.31 micro in/in- °F | 13.2 micro m/m- °K |
| 204°C / 400°F | 7.53 micro in/in- °F | 13.6 micro m/m- °K | |
| 316°C / 600°F | 7.74 micro in/in- °F | 13.9 micro m/m- °K | |
| 427°C / 800°F | 7.97 micro in/in- °F | 14.3 micro m/m- °K | |
| 649°C /1200°F | 8.39 micro in/in- °F | 15.1 micro m/m- °K | |
| 760°C /1400°F | 8.91 micro in/in- °F | 16.0 micro m/m- °K | |
| Thermal conductivity
Annealing was 1800°F/1 hr. Conductivity calculated from resistivity values. |
93°C / 200°F | 7.17 BTU/ft- hr – °F | 12.4 W/m – °K |
| 204°C / 400°F | 8.17 BTU/ft- hr – °F | 14.1 W/m – °K | |
| 316°C / 600°F | 9.25 BTU/ft- hr – °F | 16.0 W/m – °K | |
| 427°C / 800°F | 10.30 BTU/ft- hr – °F | 17.8 W/m – °K | |
| 649°C /1200°F | 12.30 BTU/ft- hr – °F | 21.3 W/m – °K | |
| 760°C /1400°F | 13.30 BTU/ft- hr – °F | 23.0 W/m – °K | |
| Electrical resistivity
Annealing was 1800°F/1 hr |
93°C / 200°F | 1270 nΩ ∙ m | |
| 204°C / 400°F | 1280 nΩ ∙ m | ||
| 316°C / 600°F | 1290 nΩ ∙ m | ||
| 427°C / 800°F | 1300 nΩ ∙ m | ||
| 649°C /1200°F | 1340 nΩ ∙ m | ||
| 760°C /1400°F | 1330 nΩ ∙ m | ||
| Temperature | Tensile | Hardness | ||||||
|---|---|---|---|---|---|---|---|---|
| Ultimate | Yield | Elongation in
50 mm (2 in.) |
Reduction
of area |
Brinell | ||||
| 1700°-1850°F Anneal
and Age |
KSI | MPa | KSI | MPa | % | % | ||
| 20°C/ 70°F | Long’ | 185 | 1280 | 150 | 1030 | 12 | 15 | 331 |
| Long’-Trans’ | 180 | 1240 | 10 | 12 | ||||
| Trans’ | 180 | 1240 | 6 | 8 | ||||
| 649°C/ 1200°F
|
Long’ | 145 | 1000 | 125 | 862 | 12 | 15 | — |
| Long’-Trans’ | 140 | 965 | 10 | 12 | ||||
| Trans’ | 140 | 965 | 6 | 8 | ||||
| 1900°-1950°F Anneal
and Age |
||||||||
| 20°C/ 70°F | 180 | 1280 | 150 | 1030 | 10 | 12 | 341 | |
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