INCONEL 718

Inconel 718 Ni-Base Superalloy Bar

The strength benchmark below 650 °C

γ″(Ni₃Nb) precipitation-strengthened Ni-base superalloy retaining high strength, creep and fatigue resistance from cryogenic -253 °C up to 650 °C — the workhorse grade for HP/HT shaft parts and downhole tools.

Technical Data

Material category: Ni-Base Precipitation-Hardening Superalloy
Specification: ASTM B637 · AMS 5663 · NACE MR0175
Delivery condition: Cold-drawn + Aged
UNS: N07718
W.Nr.: 2.4668
Specification: Inconel 718 / GH4169 / UNS N07718 / W.Nr. 2.4668

Mechanical Properties

Tensile Rm	≥ 1462 MPa
Yield Rp0.2	≥ 1393 MPa
Elongation A	≥ 12 %
Reduction of Area	≥ 15 %
Hardness	34 – 49 HRC
Service Temp.	-253 ~ 650 °C
Density	8.24 g/cm³
Condition	Cold-drawn + Aged

Chemical Composition

Values in wt%, balance is the base element.

Nickel Ni	50.0 – 55.0
Chromium Cr	17.0 – 21.0
Iron Fe	余量 Bal.
Nb+Ta	4.75 – 5.50
Molybdenum Mo	2.80 – 3.30
Titanium Ti	0.65 – 1.15
Aluminium Al	0.20 – 0.80
Cobalt Co	≤ 1.00
Carbon C	≤ 0.08
Manganese Mn	≤ 0.35
Silicon Si	≤ 0.35
Phosphorus P	≤ 0.015
Sulfur S	≤ 0.015
Copper Cu	≤ 0.30
Boron B	≤ 0.006

Technical Data

Tensile strength Rm: 1462 MPa
Yield strength Rp0.2: 1393 MPa
Elongation A: 12 %
Reduction of area Z: ≥ 15 % %
Hardness: 34 – 49 HRC
Service temperature: -253 ~ 650 ℃
Density: 8.24 g/cm³

Material Characteristics

γ″(Ni₃Nb) precipitation strengthening — high strength, creep and fatigue resistance from -253 °C to 650 °C
Ni 50.0-55.0% with Cr 17.0-21.0% for high-temperature oxidation and corrosion resistance
Nb+Ta 4.75-5.50% and Mo 2.80-3.30% form the main strengthening phases
Equivalent Chinese grade GH4169 (GB/T 14992)

Typical Applications

High-temperature shaft partsGas turbine & compressor partsDownhole toolsPower & metallurgy parts

Inspection & Certification

UT to ASTM A388/A388M-2023, acceptance class AMS-STD-2154E, 0.8 mm FBH sensitivity (immersion line-focus probe); surface and dimensional inspection before release; EN 10204 3.1 certificate (3.2 available) with each lot.