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| PRODUCT DATA of Inconel 718 |
| Material | Inconel 718 |
| Product Datasheet | Inconel 718 Inconel 718 L718DE |
| General Information | Inconel 718 is a vacuum-melted, precipitation-hardened nickel-base alloy. It can be welded easily and excels in its resistance to strain-age cracking. It is also readily formable. Depending on choice of heat treatments, this alloy finds applications requiring either (1) high resistance to creep and stress rupture to 700 C or (2) high strength at cryogenic temperatures. It also has good oxidation resistance up to 980 C. |
| Precautions | Typical data. Not for design. |
| Chemical Composition | Ni-19Fe-19Cr-5Nb-3Mo-1Ti |
| ELASTIC PROPERTIES |
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| Tensile Modulus | 208 GPa |
| ELECTRICAL PROPERTIES |
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| Electrical Volume Resistivity | 0.00000121 ohm.m |
| THERMAL PROPERTIES |
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| Thermal Conductivity | 11.4 W/m.K |
| Thermal Expansion Coefficient | 12.8 μstrain/°C Remark:CTE given as total CTE between RT and listed temperature |
| Melting Range | 1260 to 1340 °C |
| Specific Heat | 0.432 J/g.K |
| RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY |
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| General Corrosion Status | No specific corrosion protection required |
| Stress Corrosion Status | High Resistance to SCC: Table 1 Remark:Including weldments Data Quality: Design Data |
| Bimetallic Corrosion | Can be connected without any restriction to: 400 series Stainless steel
Can be connected in a non-controlled environment to the above and 300 series stainless steel, Ti and Ti-alloys, Cr, Cu, brasses, Cu-Ni, Al-bronzes, Si-bronzes, Can be connected in a clean room environment to above and Ag, SnPb alloys, Sn, Pb, low C steel, Al-Cu alloys, Cd, Au Needs specific measures: All others Test:ECSS-Q-ST-70C Rev.1 Table 5.1 Data Quality: Design Data |
| Machinability | The alloy can be readily machined in either the annealed or the age-hardened condition |
| Welding | The alloy can be welded in either the annealed or the aged condition. Welding in the aged condition will cause the formation of a softened heat-affected zone. |
| FLUID SYSTEMS COMPATIBILITY |
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| Gaseous Oxygen (GOX) | Meets the mechanical impact requirements. No batch test required. |
| Liquid Oxygen (LOX) | Meets the mechanical impact requirements. No batch test required. |
| Nitrogen Tetroxide (N2O4) | SCC susceptibility is low and no fluid decomposition |
| Hydrazine (HDZE) | SCC susceptibility is low and no fluid decomposition |
| Low Pressure Hydrogen (LOH2) | Meets the mechanical impact requirements. No batch test required |
| High Pressure Hydrogen (HIH2) | Fails mechanical impact |