What is N08825?

N08825 is the Unified Numbering System (UNS) designation for a nickel-based alloy most commonly known as Incoloy 825. The UNS system was created by a number of trade groups working together in the 1970’s, to reduce confusion from the same alloy being called different things or vice-versa. Each metal is indicated by a letter followed by five numbers, where the letter indicates the family of metals i.e. N for nickel-based alloys.

Incoloy^® 825 (UNS N08825/W.Nr. 2.4858) is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. Incoloy 825 was primarily developed in order to better resist sulphuric acid. Copper additions are well-known to improve resistance to reducing environments, such as sulphuric acid. This property is also exploited in Ferralium 255 (containing 2% copper additions) and the much more highly alloyed Alloy 20 (3-4% copper) to great effect.

The mechanical properties of Incoloy 825 are relatively constant from very low temperatures (considered cryogenic i.e. -150degC) up to 540degC (100degF). Above this temperature, there is the possibility of undesirable microstructural phase changes that significantly reduce impact toughness and elongation. Incoloy is a registered trademark of Special Metals Corporation.

Langley Alloys carries a significant stock of Alloy 825 solid bar, from ¾” up to 10” in a large number of incremental sizes.  Popular applications currently served by our customers include valve components, thermowells and sensors, fasteners and also some downhole tooling which make use of its non-magnetic properties.

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For more information about nickel-based alloys, please don’t hesitate to contact us today. We would be happy to answer any questions that you may have regarding specifications and common applications.