Blog feature Image - INCOLOY alloy 825 – Corrosion Resistant Properties

Even in the most aggressive of environments, there is a super alloy that can withstand corrosion from a wide spectrum of attacking media, giving it an exceptional versatility. Meet INCOLOY alloy 825

INCOLOY alloy 825 is made up of a precise combination of elements that impart exceptional corrosion resistance upon the material, making it an incredibly useful product for extreme environments.

It is a nickel-chromium-iron alloy that adds in molybdenum, copper and titanium. Each part of the compositional makeup helps to combat a different type of corrosion, and they work together perfectly, which is why this alloy is a popular and reliable choice among design engineers.

Composition

The nickel content of around 38-46% is high enough that the material can withstand chloride-ion stress-corrosion cracking. The nickel also works with both the molybdenum and the copper to give outstanding resistance to reducing environments, including the presence of sulfuric and phosphoric acids.

Molybdenum is a useful addition to alloys, as it lends a great deal of strength, but it also helps to resist against both pitting and crevice corrosion. We looked more in detail at the benefits of molybdenum in a dedicated article on our blog earlier in the year. The alloy’s substantial chromium content (19.5-23.5%) – another element that we have covered in more detail – helps the material with resistance to oxidising elements, such as nitric acid, nitrates and oxidising salt.

Finally, the addition of titanium (0.6-1.2%) is balanced in the composition and, with the right heat treatment, stabilises the alloy and helps to prevent against sensitisation to intergranular corrosion.

All of these different elements work together in harmony to offer a broad spectrum of corrosion resistance, making INCOLOY alloy 825 useful in so many environments.

Applications

There are quite a few industries where INCOLOY alloy 825 is employed due to its impressive corrosion-resistant properties. For example, it is often utilised in chemical processing, pollution control, oil and gas recovery, acid production, pickling operations nuclear fuels reprocessing and handling of radioactive wastes.

It can be found within the mining industry, where it is used in the screening wires that are employed to size mineral particles. Because of its particular resistance to sulphuric and phosphoric acids, it can often be found as a material of choice in oil and gas well piping.

It is used broadly across the whole of the industry of oil and gas extraction, where materials are subject to extremely corrosive media and high temperatures. As well as the extraction plants themselves, INCOLOY alloy 825 can be used in the processing equipment for liquefied natural gas production, for the separation of extracted fluids.

Other areas in which this alloy excels are in environments that contain sulphur-containing flue gases, sour gas and sea water, all challenging conditions that present different corrosive issues.

If you would like to find out more about INCOLOY alloy 825, please see our product specific page. If you’re interested in finding out more about this material for your next project, then Contact Us to discuss your requirements.

Topics: Corrotherm News

Sign up for our blog