How strong is Inconel 625?

Inconel 625 is not considered particularly high strength, especially if compared with other grades within the Inconel family of Special Metal Corporation such as Inconel 718. In bar form, Alloy 625 (UNS N06625, DIN 2.4856) has a minimum yield strength of 50ksi (345MPa) for larger diameter solid bars compared with 120ksi (827MPa) for Alloy 718.

Inconel 625 is usually selected for its excellent corrosion resistance rather than its strength. Inconel 625 is composed of at least 58% nickel, 20-23% nickel and 8-10% molybdenum. The high alloy content of Inconel 625 makes it able to withstand severe corrosive environment: the combination of nickel and chromium provides resistance to oxidizing chemicals, whilst nickel and molybdenum additions ensure resistance to non-oxidising environments. The high molybdenum content also makes this alloy very resistant to pitting and crevice corrosion. As such, it is widely used in Oil and Gas applications, marine, chemical processing industries, and aerospace.

Where the intended application requires the excellent physical properties of Inconel 625, but with far higher strength, then Inconel 725 may be used. It is very similar to the composition of Inconel 625, except that an addition of titanium is made that, when subject to an additional heat treatment process, result in significantly higher strength.

Langley Alloys stocks Alloy 625 as round bars up to 10” (254mm) in diameter, and Alloy 725 as round bars from 1”-4” diameter (25.4-101.6mm).

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