About Alloy
NIMONIC alloy 75 is an 80/20 nickel-chromium alloy with controlled additions of titanium and carbon. First introduced in the 1940s for turbine blades in the prototype Whittle jet engines, it is now mostly used for sheet applications calling for oxidation and scaling resistance coupled with medium strength at high operating temperatures. It is still used in gas turbine engineering and also for industrial thermal processing, furnace components and heat-treatment equipment. It is readily fabricated and welded.
Product Form
Bar, rod and wire rod: BS HR 5, BS HR 504, DIN 17752,
Plate, strip, sheet: BS HR 203, DIN 17750
Pipe and tube: BS HR 403, DIN 17751
Chemical Composition
| Ni | Cr | Ti | C | Si | Cu | Fe | Mn | Ni | Cr |
| Bal | 18.9-21 | 0.2-0.6 | 0.08-0.15 | 1.0 max | 0.5 max | 5.0 max | 1.0 max | Bal | 18.9-21 |
Property
| Test Temp ℉ | Tensile Strength (Ksi) | Yield Strength (Ksi) 0.2% | Elongation in 2” |
| Room | 114.4 max | 59.4 | 31 |
| 1000 | 105.6 max | 51.9 | 27 |
| 1200 | 69.3 max | 40 | 32 |
| 1400 | 41.4 max | 22 | 75 |
| 1600 | 20.2 max | 9.9 | 90 |
| 1800 | 9.7 max | 4.4 | 91 |
Application
Aerospace industry: The alloy is utilized in aerospace applications, including aircraft engines, where its high-temperature strength and resistance to thermal fatigue are beneficial.
Industrial heating elements: Alloy 75 is used in the manufacturing of industrial heating elements and furnace components due to its ability to withstand high temperatures and oxidation.
High-temperature fasteners: The alloy is employed in the production of high-temperature fasteners, such as bolts and nuts, for applications in extreme environments.
Springs and seals: Alloy 75 is used in the manufacturing of springs and seals for high-temperature and corrosive environments, such as in chemical processing and petrochemical industries.
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