What is the melting point of Inconel 718?
What are the physical properties of Inconel 718?
Nickel Alloys
Inconel 718 (UNS N07718, DIN 2.4375) is a widely used nickel-based alloy with significant alloying additions. As a nickel-based alloy, it is virtually non-magnetic. Although it may contain up to 20% iron by weight, most people would consider it non-ferrous and describe it as a superalloy based on its performance at elevated temperatures.
History of Inconel 718
Inconel 718 was originally developed for steam power plants, but has found wider use in aerospace applications due to its resistance to oxidation at elevated temperatures. However, its ready availability, combined with high strength and excellent corrosion resistance in seawater, makes it a suitable candidate for emerging applications in the oil and gas industry.
Inconel 718 retains most of its mechanical properties at temperatures up to 650 degrees Celsius (1200 degrees Fahrenheit), although it also resists oxidation at higher temperatures. Inconel 718 has a melting point in the range of 1260-1340 degrees Celsius (2300-2440 degrees Fahrenheit).
Nickel-based alloys such as Inconel 718 harden during machining, drilling, and fabrication. Given that it is already a high-strength alloy when supplied in the aged state, careful selection of tools, coolants, and CNC machine settings is required. Inconel 718 is easily welded, though a matching filler metal is generally required if welded to itself.
Inconel 718 vs. Inconel 625
Comparing Inconel 718 to Inconel 625, Inconel 625 has a higher alloy content and therefore better corrosion resistance in most environments, albeit at a higher cost. However, Inconel 718 has a higher strength due to alloying additions combined with heat treatment, allowing it to be age-hardened.
