What is 925 alloy?

Alloy 925 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.

Alloy 925 was developed by Special Metals Incorporated, who have promoted it under their trademark of Incoloy 925. There are more than ten different grades currently named within the Incoloy family, but the two most widely used Incoloy grades are Incoloy 825 and Incoloy 925.

The mechanical properties of Incoloy 925 are achieved through precipitation-strengthening. Small additions of titanium, aluminium and niobium combine to form fine precipitates throughout the metal when it is subjected to a secondary heat treatment process. These precipitates help to ‘pin’ the microstructure of the metal when it is subject to an external load, increasing its strength and toughness.

As a nickel-based grade, Alloy 925 has good corrosion resistance, and resists oxidation at elevated temperatures. It retains most of its room temperature strength and toughness at very low temperatures and high temperatures. It is also non-magnetic which can be important for some applications, such as measurement equipment utilised in downhole Oil and Gas applications.

Alloy 925 is less readily available in the smallest diameters, so our stock typically starts at 4”-10” (101.6-254mm) diameter.

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