What is NES835?

NES835 is commonly used to describe the alloy better-known as Hiduron 191 (UNS C72420).

The Hiduron family of alloys were developed by Langley Alloys from 1939 onwards and immediately adopted for naval applications. Hiduron 130 (DIN 2.1504, DTD4805/4805) is most widely used on account of its very high-strength. Hiduron 191 was developed subsequently to improve the level of impact strength, substituting a small amount of the original grades yield strength in return for greater toughness.

NES stands for Naval Engineering Standard, originally produced by the UK’s Ministry of Defence. It has been replaced by Def Stan 02-835, where Def Stan is shorthand for Defence Standard. Therefore, Hiduron 191 is also referred to as Def Stan 02-835, where this standard covers the “Requirements for High Strength Copper Nickel Manganese Alloy Forgings, Forging Stock Rods and Sections”.

Copper Nickel alloys, also known as Cupronickels, improve upon the strength of copper, but retain the favourable physical properties such as resistance to corrosion and fouling.

Langley Alloys carries stock of Hiduron 130 and Hiduron 191 as round bar. Hidruon 130 is most popular and can usually be satisfied from stock, whereas Hiduron 191 (NES835) is more typically used for projects that are supplied from production, often with bespoke forged blocks.

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