Special Metallurgy In718 is used in jet engine and high-speed airframe parts such as wheels, buckets and spacers, and high-temperature bolts and fasteners. Inconel 718 is also used in the oil and gas drilling and production industries due to its high strength and resistance to chlorides, stress corrosion and sulfide stress cracking. Within these industries the alloy has been used for valves, pump shafts and wellhead components.
Special Metallurgy Alloy 718 should be forged from a maximum furnace temperature of 2050ºF (1120ºC) and should not be soaked for an overly long time at this temperature. Uniform reductions during forging will prevent the formation of a duplex grain structure. Working in the range 1700/1850ºF (925/1010ºC) will improve the forging’s strength if its subsequent service temperature is below 1100ºF (595ºC.)
| CHEMICAL ANALYSIS | |
|---|---|
| C | Carbon 0.08 max |
| Mn | Manganese 0.35 max |
| P and S | Phosphorus and Sulfur 0.015 maxx |
| Si | Silicon 0.35 max |
| Ni(+Co) | Nickel Colbalt 50.0/55.0 |
| Cr | Chromium 17/21 |
| Co | Cobalt 1.00 max |
| Cu | Copper 0.15 max/td> |
| Al | Aluminium 0.35/0.80 |
| Mo | Molybdenum 2.80/3.30 |
| Ti | Titanium 0.65/1.15 |
| Cb + Ta | Columbium + Tantalum 4.75/5.50 |
| B | Boron 0.001/0.006 |
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