Inconel 625 oxidation resistance is higher than that of other alloys. It is one of the many reasons that this alloy is purchased so commonly within the industries of chemical process and aerospace.
Oxidation is reliant mainly on the oxygen level of the atmosphere, with gases such as carbon dioxide and steam supporting the reaction.
Other properties of alloy 625 include resistance to pitting, crevice corrosion and resistance to nonoxidizing atmospheres, thanks to the added Nickel and molybdenum present within the material.
Inconel 625 Oxidation Resistance Charts
Comparative burner rig oxidation resistance tests at 1000 Hours were carried out by Haynes International. Samples included 9mm x 64mm x thickness) in a rotating holder with x2 types of fuel oils.
Burned at a ratio of air to fuel 50:1 for 1000 hours of testing. Please note: Samples used were removed from the gas stream every 30 minutes, in which they would be fan cooled to a ambient temperature – allowing reinsertion into the tunnel.
Burned at a ratio of air to fuel 50:1 for 1000 hours of testing. Please note: Samples used were removed from the gas stream every 30 minutes, in which they would be fan cooled to a ambient temperature – allowing reinsertion into the tunnel.
1800F (980C)
Metal Loss
mils – 4.9
µm – 124
Average Metal Affected
mils – 7.1
µm – 180
Maximum Metal Affected
mils – 7.6
µm – 193
Two other oxidation test results were also recorded for Flowing Air resistance of 1008 Hours and cont. Oxidation resistance tests for 360 days (8.640 Hours.) See the full results in the PDF below:
For more information on the application of alloy 625, speak to one of our engineers at technical@waverleybrownall.co.uk
Helpful links:
- Inconel 625 Special Metals – Waverley Brownall
- Oxidation Resistance of Alloy 625 – SandMeyerSteel
- Alloy 625 FactSheet – California Metal
- Oxidation Resistance – Corrosion Source
