Alloy 625 is a member of Inconel alloys. Inconel alloys are superalloys of chromium and nickel. They perform well under elevated temperatures and high pressure environments. They are very much corrosion resistant. They are resistant to oxidation and reduction, most acids, dry gases under room temperature and are very strong materials in general. There are different grades of the alloy such as the Alloy 625 Grade 1 and the Alloy 625 Grade 2 which could be used interchangeably. The alloy 625 is very much corrosion resistant inside water and outside the aqueous solutions. This property makes it used in nuclear and sea water applications as well. It is much creep resistant than its counterparts. For this reason, the Alloy 625 applications can use heavy welding and yet be pitting and creep corrosion resistant.
The material can withstand cryogenic temperatures and very high temperatures. This fluctuation of temperature tolerance is useful in power plants, nuclear facilities and in heat exchangers. The material is solid solution annealed. And therefore remains very strong after production. Cold working and machining are possible on the material but are very hard to perform. There are Alloy 625 equivalent grades which could be used in place of this material.The Alloy 625 machinability is less compared to other metal products but it could be machined slowly with power tools. The lower the number of passes in machining, the better the performance of 625 Inconel material.
Niobium content above includes tantalum. A nickel-chromium-molybdenum alloy with an addition of niobium that acts with the molybdenum to stiffen the alloy’s matrix and thereby provide high strength without a strengthening heat treatment. The alloy resists a wide range of severely corrosive environments and is especially resistant to pitting and crevice corrosion. Used in chemical processing, aerospace and marine engineering, pollution-control equipment, and nuclear reactors.
