Summary
Nimonic 75 is a sheet and fabrication alloy; 80A is a stronger age-hardened alloy for rotating and highly loaded parts. They share the same Ni-20Cr base, so the minor elements decide.
The titanium difference shows on a handheld XRF. Confirm aluminium with OES if the buyer needs it. See Nimonic 75 scrap and Nimonic 80A scrap.
Side by Side
| Nimonic 75 | Nimonic 80A | |
|---|---|---|
| Chromium | About 20% | About 19.5% |
| Titanium | About 0.4% | About 2.25% |
| Aluminium | Trace | About 1.4% |
| Strengthening | Solid solution | Precipitation (γ′) |
| Typical service | Turbine sheet parts, furnace fixtures | Turbine blades and rings, exhaust valves, bolts |
Composition Compared
Nominal compositions compared element by element. Values are the nominal figures from each grade page; change either grade to compare others.
On a handheld XRF: the clearest differences between Nimonic 75 and Nimonic 80A are titanium (0.4% vs 2.25%), iron (2.5% vs 0.75%) and nickel (77.1% vs 76.1%). Light elements such as aluminium, silicon, carbon and nitrogen need a light-element instrument, OES or a laboratory.
On the XRF
Switch the grade to see how the fingerprint changes. See how XRF sorts nickel alloys.
FAQ
What is the main difference between Nimonic 75 and Nimonic 80A?
Both are nickel with about 20% chromium. Nimonic 80A adds about 2.25% titanium and 1.4% aluminium for age hardening; Nimonic 75 has only about 0.4% titanium.
Can Nimonic 75 and Nimonic 80A scrap be mixed?
No. Keep them separate. A melt shop buying Nimonic 75 expects Nimonic 75 chemistry, so a few pieces of Nimonic 80a can push a heat out of limits and lead to a re-sort or a lower offer.
What are the UNS numbers of Nimonic 75 and Nimonic 80A?
Nimonic 75 is UNS N06075 and Nimonic 80A is UNS N07080.
Which has more nickel, Nimonic 75 or Nimonic 80A?
Nimonic 75, with about 77.1% nickel against about 76.1% in Nimonic 80A, using the nominal values on this site.
Sources and Review
Composition figures on this page are the nominal values from each grade's own page on this site, where the producer datasheet or standard is named in full. The comparison widget reads the same values. The sources behind the grades are listed below.
- Special Metals Corporation, NIMONIC alloy 75 (SMC-058, 2004): Nimonic 75 Buyer, Importer and Exporter
- Special Metals Corporation, NIMONIC alloy 80A (SMC-099, 2004): Nimonic 80a Buyer, Importer and Exporter
Published by Mipra Steel, Khetwadi, Mumbai · Last updated