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PRODUCT DATA of Inconel 718
MaterialInconel 718
Product DatasheetInconel 718
Inconel 718 L718DE
General InformationInconel 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.
PrecautionsTypical data. Not for design.
Chemical CompositionNi-19Fe-19Cr-5Nb-3Mo-1Ti
ELASTIC PROPERTIES
Tensile Modulus208 GPa
ELECTRICAL PROPERTIES
Electrical Volume Resistivity0.00000121 ohm.m
THERMAL PROPERTIES
Thermal Conductivity11.4 W/m.K
Thermal Expansion Coefficient12.8 μstrain/°C
Remark:CTE given as total CTE between RT and listed temperature
Melting Range1260 to 1340 °C
Specific Heat0.432 J/g.K
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
General Corrosion StatusNo specific corrosion protection required
Stress Corrosion StatusHigh Resistance to SCC: Table 1
Remark:Including weldments
Data Quality: Design Data
Bimetallic CorrosionCan 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
MachinabilityThe alloy can be readily machined in either the annealed or the age-hardened condition
WeldingThe 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
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