Nimonic 91

Nimonic 91 is a wrought nickel-chromium-cobalt based alloy strengthened by additions of aluminum and titanium. This alloy is a modification of Nimonic alloy 90, but has an increased chromium content to improve corrosion resisistance in salt and sulfur contaminated environments.

Equivalent Grades

Nimonic 91

Chemical Composition, %

Nimonic 91≤0.10≤1.00≤1.00≤0.020≤0.01527.0-30.0Bal19.0-21.00.4-1.10.9-1.51.9-2.7≤0.50≤1.00

Typical Physical and Mechanical Properties (RT, Annealed)

Density, g/cm3Melting Point, ℃Tensile Strength, MPaYield Strength, MPaELongation, %Hardness, HRB

Available Products and Specifications

Rod, Bar, Wire and Forgings
Plate, Sheet and Strip
Pipe and Tube
Welding Product


Nimonic 91 is suitable for long service up to about 900°C. It combines good strength and ductility with stability of microstructure and excellent resistance to hot corrosion.


Nimonic 91 is intended for high-temperature stressed parts such as blades in gas turbines burning impure fuels or operating in marine environments.