What is Alloy 625 called?

Alloy 625 is more frequently referred to as Inconel 625, where Inconel is a registered trademark of Special Metals Corporation. Alloy 625 is also referenced by the unified numbering system code UNS N06625 and the caption DIN 2.4856. AMS5666 is the aerospace-related specification against which Alloy 625 can also be supplied.

Alloy 625 is not considered particularly high strength, especially if compared with other grades 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.

Alloy 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.

Langley Alloys stocks Alloy 625 as round bars up to 10” (254mm) in diameter.

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