Is Alloy 825 stainless steel?

Alloy 825 is a nickel-based alloy, which means that the largest element present is nickel at 38-46% of the total. It also contains iron, chromium and molybdenum, but at lower proportions.

A stainless steel is a type of steel that resists corrosion. The composition of a steel product is based upon iron, and a stainless steel needs at least 11.5% chromium in order to resist general corrosion. Increasing the level of chromium will increase the resistance to corrosion, whilst additions of nickel, molybdenum and other elements will improve mechanical properties and corrosion resistance further.

Therefore, although both Alloy 825 and stainless steels contain iron, chromium and nickel, they do so in quite different proportions. Nickel is an expensive alloying addition; therefore Alloy 825 is more expensive than most stainless steel grades. However, the higher content of nickel means that it resists oxidation when exposed to higher temperatures and has excellent resistance to many acids. Compared with a lot of other nickel-based alloys, such as Inconel and Monel grades, the level of nickel and the price are not as high.

Langley Alloys stocks Alloy 825 as round bars from 5/8”-10” diameter (15.87-254mm), with pipes and hollow bar also available. We also stock an extensive range of the higher-performing stainless steel grades, such as Ferralium 255, S32750, S32760, S32205, Nit50 and Nit60. These are available ex-stock in much larger diameters up to 16” (406.4mm) dependent upon the specific product, plus plates, pipes, flanges and fittings.

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For more information about our range of alloys, please contact Langley Alloys today.