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

TrademarkGBGOSTASTMUNSDINW.Nr.NFBSJISSS
Nimonic 91

Chemical Composition, %

AlloyCSiMnPSCrNiCoNbAlTiCuFe
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
8.081300-1350119068030/

Available Products and Specifications

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

Features

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.

Applications

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