inconel material is an austenitic nickel-chromium-based alloy that is highly oxidation and corrosion resistant. It is also characterized by high strength and toughness.
The main factor that makes Inconel particularly resistant to oxidation is the complex intermetallic compound Ni3Nb, which forms in the gamma double prime (g') phase when exposed to high temperatures. This 'glue' prevents the grain boundaries from expanding, which improves both the physical properties of the alloy - ductility and toughness - and its resistance to corrosion.
In addition, the g' phase creates a layer of passivation that inhibits oxidation even at elevated temperatures. These properties make Inconel a good choice for applications from gas turbine blades to deep sea well drilling.
There are several types of Inconel. Typically, these alloys are formed from nickel and chromium in a range of concentrations. Each variant has specific properties that make it a good fit for particular applications.
Compared to other high-nickel superalloys, Inconel 625 is between those with higher nickel content – such as Inconel 330 and 600 – and those with lower nickel content – such as Inconel 710. It has excellent tensile and creep rupture strength, and it's easily welded by standard gas tungsten arc welding methods.
Oil and gas extraction industries need a superalloy that can withstand the extreme temperatures and volatile, corrosive gasses of natural gas production. The Inconel 625 variety is often used in the processing systems needed for this type of production.
