Inconel 718

Steelun Steel Standards of Inconel 718:

UNS N07718

Equivalent standards of Inconel 718:

DIN EN 2.4668 – NiCr19Fe19Nb5Mo3,ISO NiCr19Nb5Mo3
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Steelun Description of  Inconel 718:

Inconel 718 is an age hardenable nickel-chrome-iron-molybdenum alloy. The age hardening is achieved by specific additions of niobium, titanium and aluminum. It can be delivered in solution annealed or hardened condition. Inconel 718 is characterized by: Good processing properties in the solution-annealed condition, good mechanical short and long-term properties, and great fatigue strength in the age hardened condition, good creep resistance up to 700°C, good oxidation resistance up to approx. 1100°C, excellent mechanical properties in low temperatures.

Chemical composition of Inconel 718:

Element Weight %
Ni 50.0 — 55.0
Cr 17.0 — 21.0
Nb 4.75 — 5.5
Mo 2.8 — 3.3
Ti 0.65 — 1.15
Co 1.0
Al 0.2 — 0.8
Mn 0.35
Si 0.35
Cu 0.3
C 0.08
Ta 0.05
S 0.015
P 0.015
B 0.006
Pb 5.0E-4
Bi 3.0E-4
Se 3.0E-5

Steelun Properties of Inconel 718:


General information

Density [ ρ ] 8.26 g/cm³
Relative magnetic permeability [ μrel ] 1.00


Melting point [ Tm ] 1257—1342 °C
All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.

Technological properties of Inconel 718:

Application areas
Based on its high-temperature resistance up to 700 °C, its excellent oxidation and corrosion resistance, and its good workability, Inconel 718 is used in many demanding applications. Originally, it was developed and used for static and rotating components in aircraft turbines such as housings, mounting elements and turbine disks, where tough requirements apply for creep resistance and fatigue behavior, in particular for the rotating applications. Due to its properties, its good workability and efficiency, the material is additionally widely used for static and rotating components in stationary gas turbines, rocket drives and spacecraft, motor vehicle turbo chargers, high-strength screws, springs and mounting elements, and for heat-resistant tools in forgeries, extruders and separating shearers. The variant Inconel 718 CTP, which is laid out specifically for the requirements of the oil and gas industry, finds increasing uses in drilling equipment and pump shafts. The components used must ensure an efficient and safe oil and gas extraction with increasing drilling hole depth and pressures and temperatures becoming more critical, and withstand the acid gas environment (H₂S, CO₂, chloride) that is prevalent there (see special data sheet Inconel 718 CTP).
Corrosion properties
Based on the high chrome and molybdenum concentrations, Inconel 718 has a good resistance in many media against abrasive and local corrosion such as pitting. By virtue of its high nickel content, Inconel 718 also has good resistance against stress corrosion cracking.
While Inconel 718 in the solution annealed condition is easier to process and the strain on tools is less, better surface quality is achieved in the hardened condition. The best results in terms of the surface quality of the finished product are achieved by pre-treatment before hardening and by finishing in the hardened condition. As the alloy is more prone to work-hardening than other low alloyed materials, low cutting speeds and appropriate feed rates should be used and the tool should stay engaged at all times. Sufficient chip depths are important to get below the work-hardened surface layer.
Inconel 718 has an austenitic structure; multiple phases can be precipitated. By means of different heat treatments, graduated mechanical properties of the material can be reached. The excellent mechanical properties of Inconel 718 result from the γ’’-formation during the precipitation hardening.

Steelun Applications of Inconel 718 :
Extraction & Processing of Petroleum & Natural Gas, Aerospace Engines & Propulsion, Equipment for Chemical Industry, Materials for Aerospace Construction, Gas & Steam Turbines, Drilling Equipment, Industrial Machinery.

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