Description Of Inconel 718


Inconel 718 is a precipitation hardening nickel-chromium alloy containing a large amount of iron, niobium and molybdenum, and a relatively small amount of aluminum and titanium. Inconel 718 maintains high strength and good ductility at temperatures up to 1300 ° F (704 ° C). Compared with other precipitation hardening nickel alloys, the alloy has relatively good weldability, formability and excellent low temperature performance. The slow hardening response of the alloy makes it easy to weld without hardening or cracking.

How to machine inconel 718?

Description Of Inconel 718. -PTJ CNC MACHINING Shop

Inconel 718 Application

Inconel 718 has good corrosion resistance and yang resistance in jet engine and gas turbine applications. The alloy is used for parts that require high creep resistance and stress cracking up to 1300 ° F (704 ° C) and oxidation resistance up to 1800 ° F (982 ° C). Even at low temperatures, Machining Inconel 718 has excellent tensile and impact properties. AMS 5662 requires a yield strength ≥ 150,000 psi at room temperature.


Inconel 718 machinability

Inconel 718 is classified as a precipitation hardening alloy that can be age hardened by heat treatment. The grain structure maintains austenite at all temperatures. Various solutions and aging treatments are used during this level of heat treatment to optimize short-term or long-term high-temperature mechanical properties.


Chemical composition (wt%)

(Limited to ASTM B637)

Carbon: ≤0.08 Silicon: ≤0.35

Chrome: 17.00-21.00 Copper: ≤0.30

Nickel: 50.00-55.00 Phosphorus: ≤0.015

Molybdenum: 2.80-3.30 Sulfur: ≤0.015

Titanium: 0.65-1.15 Aluminum: 0.20-0.80

Cobalt: ≤1.0 Niobium + Tantalum 4.75-5.50

Manganese: ≤0.35 Boron: ≤0.006


Inconel 718 physical properties

Density, pounds / inch 3: 0.296

Modulus of elasticity, psi: 29 x 10 6

Coefficient of thermal expansion, 68-212? F, /? F: 7.1 x 10 -6

Thermal conductivity, Btu / fthr? F: 6.5

Specific heat, Btu / lb? F: 0.10

Resistivity, Microhm-in: 47.6


Chemical composition (wt%)

(Limited to ASTM B637)

Carbon: ≤0.08 Silicon: ≤0.35

Chrome: 17.00-21.00 Copper: ≤0.30

Nickel: 50.00-55.00 Phosphorus: ≤0.015

Molybdenum: 2.80-3.30 Sulfur: ≤0.015

Titanium: 0.65-1.15 Aluminum: 0.20-0.80

Cobalt: ≤1.0 Niobium + Tantalum 4.75-5.50

Manganese: ≤0.35 Boron: ≤0.006


Inconel 718 mechanical properties:

ASTM B637 specifies the mechanical properties of heat-treated products (solution + precipitation hardening)

Yield strength (KSI) ≥150

Tensile strength (KSI) ≥185

Elongation (%) ≥12

Brinell hardness≥331

Typical standards for Alloy 718:

ASTM B637

ASME SB637

AMS 5662

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