Alloy 718: Premium Nickel-Chromium Alloy for High-Performance Applications

2.4668 (NiCr19NbMo) is a precipitation hardening nickel-chromium alloy that also contains additions of iron, niobium, molybdenum, aluminium and titanium, providing a unique combination of high strength and corrosion resistance together with excellent weldability. It shows the following features and properties:

Excellent tensile, fatigue, creep and rupture strengths across a wide temperature range from around -253ºC to 705ºC

Excellent oxidation resistance, up to temperatures of around 980ºC due to the high chromium content

Outstanding corrosion resistance in many environments including organic and inorganic acids, other than when strongly oxidising, hydrogen sulphide and sour gases

Especially resistant to chloride stress-corrosion cracking

Exceptional weldability

Properties

General

Property	Temperature	Value
Density	23.0 °C	8.22 g/cm³

Mechanical

Property	Temperature	Value
Elastic modulus	23.0 °C	204 GPa
Elongation	23.0 °C	12 - 17 %
Hardness, Brinell	23.0 °C	313 - 354 [-]
Reduction of area	23.0 °C	15 %
Tensile strength	23.0 °C	1034 - 1276 MPa
Yield strength Rp0.2	23.0 °C	827 - 1034 MPa

Thermal

Property	Temperature	Value	Comment
Coefficient of thermal expansion	23.0 °C	1.35E-5 1/K
Melting point		1260 - 1335 °C
Thermal conductivity	23.0 °C	14.2 W/(m·K)	for 0-200°C

Magnetic

Property	Temperature	Value
Relative magnetic permeability	23.0 °C	1 [-]

Chemical properties

Property	Value
Aluminium	0.5 %
Chromium	19 %
Iron	18 - 18.5 %
Molybdenum	3 %
Nickel	53 %
Niobium	5 %
Titanium	0.9 %

Technological properties

Property
Application areas	Offshore & marine: Fasteners, valves, choke stems, down-hole tooling, cryogenic storage tanks and pump bodies;Aerospace: Jet engine components, rocket motors and thrust reversers;Power generation: Nuclear reactor parts, gas turbine components, nuclear fuel element spacers, containment vessels and valves;Other: Hot extrusion tooling
Corrosion properties	Excellent corrosion resistance
Hot forming	It can be hot worked between 985-1150°C.

Alloy 625 Inconel®: Premium Nickel Alloy for High-Temperature, Corrosion-Resistant Aerospace & Offshore Applications SAE J1392 Grade 050AH Hot-Rolled Steel – Premium Low-Carbon Quality

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