Inconel is a superalloy containing iron, nickel chromium.  It is generally used in high temperature applications.  Inconel can resist oxidation and corrosion, which makes it suitable for applications in extreme environments.  At high temperatures, a passivating layer of oxide is formed by initial oxidation.  This layer prevents further oxidation.  Inconel is non magnetic.

Inconel is a difficult alloy to shape.  It gets hardened during the working process itself (work hardening).  Special manufacturing techniques are thus required. 

Inconel is a trademark of Special Metals Corporation. 

Inconel finds application in cryogenic tanks, jet engines, gas turbines, etc.