Inconel 718 is a precipitation-hardenable nickel-based alloy. This alloy is designed for extremely high tensile strength, creep-rupture properties and yield strength at temperatures up to 705ºC/ 1300ºF. This nickel alloy boasts of having incredible weldability, especially in comparison to the nickel-base superalloys that are hardened by titanium and aluminum. The Alloy 718 additionally has quite a sluggish age-hardening response that permits welding and annealing without spontaneous hardening during cooling and heating. This alloy tends to be used for jet engine and high-speed airframe parts, including spacers, buckets, and wheels. High-temperature bolts and fasteners are also its common applications.
Inconel 718 Mechanical Properties
Typical room temperature properties, 1800°F annealed condition
|Ultimate Tensile Strength, psi||.2% Yield Strength psi||Elongation %||Hardness Rockwell B|
Inconel 718 boasts of having quite an exceptional corrosion resistance to diverse media. Its resistance capacity is similar to that of many other nickel-chromium alloys, as it’s a function of its core composition. Nickel is known to contribute to corrosion resistance in a variety of organic and inorganic compounds throughout expansive ranges of alkalinity and acidity. This alloy is known to be useful in efficiently combating chloride-ion stress-corrosion cracking. The chromium content present in Alloy 718 additionally provides it with the ability to withstand attack by sulfur compounds and oxidizing media, while on the other hand, molybdenum is famed for contributing to resistance to pitting in several media.
Heating and Pickling
When heating Inconel 718 it is important to make sure that both this nickel alloy and the furnace are being heated at the perfect correct temperatures. The fuels used for heating should be extremely low in sulfur. Before being charged into the furnace, the alloy should additionally be efficiently cleaned from all shop soil, paint, grease, and oil.
The furnace atmosphere for open annealing or forging should be reduced slightly, and contain at least 2% carbon monoxide. A bit of positive pressure also must be maintained in the furnace in order to prevent air infiltration. A thin, adherent green-black film of oxide ideally would be left on the surface of the material as alloy 718 is heated. In the case of oxidizing atmospheres, a certain heavy black scale is formed that is highly difficult to remove. Hence, it is important to be very cautious in the heating process of this alloy, so that just the green-black film is ultimately formed.
Machinability and Weldability
The Alloy 718 is extremely readily machined. It can be machined in either age-hardened or annealed conditions. These age-hardened conditions usually provide a superior surface finish, while annealed condition facilitates a longer tool life.
This nickel alloy can be welded in either annealed or aged conditions. Welding an age-hardened material would eventually lead to the formation of a softened heat-affected zone.
Alloy N07718 Melting Point
|Solution Treated||Solution Treated and Aged|
|Density||0.296 lb/in3 (8.192 g/cm3)||0.297 lb/in3 (8.22 g/cm3)|
Inconel 718 Equivalent
|Inconel 718||2.4668||N07718||NCF 718||–||–||–||–|
We are having largest inventory & ready stock of inconel 617 pipes in different size, grades & cuts. inconel 617 pipe Chemical Composition
|Manganese, Mn||= 1|
|Silicon, Si||= 1|
|Carbon, C||= 0.15|
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