Nimonic Alloy 75

Chemical Analysis
C Carbon
0.08 – 0.15
Mn Manganese
1.00 max
Si Silicon
1.00 max
Fe Iron
5.00 max
Cr Chromium
18.00 – 21.00
Ni Nickel
Ti Titanium
0.20 – 0.60
Cu Copper
0.50 max

General characteristics of Nimonic Alloy 75

Nimonic alloy 75 is an 80/20 Nickel -Chromium alloy with controlled carbon and titanium additions. It is used where scaling resistance at high temperatures, together with medium strength, is of primary importance. The alloy is easily fabricated and welded.


This alloy was first used in the 1940s in the prototype Whittle jet engine. It is now mostly used in sheet applications calling for scaling resistance at high temperatures, but is still used in gas-turbine engineering and for industrial thermal processing, furnace components and heat-treatment equipment.


The alloy may be forged between 2230 and 1750ºF (1220 and 950ºC.) followed by air cooling.

Heat treatment

For bar products, heat for 30-60 minutes to 1920ºF (1050ºC) followed by air cooling.
For sheet products, 5-10 minutes at 1920ºF (1050ºC) followed by air cooling, or, before welding, 5-10 minutes at 1920ºF (1050ºC) and air cool, plus an optional 10 minutes at the same temperature followed by air cooling.


The alloy shows the normal machining characteristics of an austenitic type alloy and as such the normal positive feeds and speeds should be used.


The alloy should preferably be welded in the annealed condition, and post-weld treatment is not normally necessary unless corrosion conditions are severe. MMA, TIG, MIG and submerged-arc processes may be used, as may electron beam, oxy-acetylene and resistance welding.


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