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
| Trademark | GB | GOST | ASTM | UNS | DIN | W.Nr. | NF | BS | JIS | SS |
| Nimonic 91 | – | – | – | – | – | – | – | – | – | – |
Chemical Composition, %
| Alloy | C | Si | Mn | P | S | Cr | Ni | Co | Nb | Al | Ti | Cu | Fe |
| Nimonic 91 | ≤0.10 | ≤1.00 | ≤1.00 | ≤0.020 | ≤0.015 | 27.0-30.0 | Bal | 19.0-21.0 | 0.4-1.1 | 0.9-1.5 | 1.9-2.7 | ≤0.50 | ≤1.00 |
Typical Physical and Mechanical Properties (RT, Annealed)
| Density, g/cm3 | Melting Point, ℃ | Tensile Strength, MPa | Yield Strength, MPa | ELongation, % | Hardness, HRB |
| 8.08 | 1300-1350 | 1190 | 680 | 30 | / |
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.
