About Smiths

We are a world-class supplier of engineering raw materials. Our objective is to provide all our customers, from the small machine shop to the large multi-national corporation, a supply path that continuously delivers the highest levels of service, quality and value.

DEF STAN 02 780 (NES 780)

Copper Nickel Alloy

NES 780 Copper Nickel Alloy

DEF STAN 02-780 (NES780) is a cupronickel alloy (copper-nickel) which contains 70% copper and 30% nickel; this alloy was formally known as CN107.

Subsea Applications

The alloy includes small additions of iron and manganese to improve resistance to high-velocity seawater. DEF STAN 02-780 (NES780) can be used in more demanding applications than DEF STAN 02-779 (NES779) as it has higher strength once annealed. The alloy naturally produces a protective oxide film (or patina) which prevents marine growth in subsea service. DEF STAN 02-780 (NES780) is easily formed, easily welded and easy to fabricate with good hot and cold working properties.


DEF STAN 02-780 (NES780) Copper Nickel Alloy is a 70/30 copper-nickel with small additions of iron and manganese to improve resistance to high-velocity seawater. It has higher strength and better corrosion resistance when compared with 90/10 alloy but has slightly reduced anti-fouling properties. We offer this material in Grade 1, and it is ultrasonically tested to DEF STAN 02-729 Part 5 Issue 3, supplied with 3.2 certification as standard and to NDE02-05 latest revision.

Typical Applications

Commercial applications for this engineering material include:

  • Seawater service applications
  • Marine hardware
  • Above sea and subsea fittings
  • Heat exchangers
  • Condensers
  • Desalination units
  • Pipework
  • Submarine components

We stock NES 780 in round bar.

Technical Assistance

Our knowledgeable staff and resident metallurgists will be pleased to assist you further on any technical topic. Smiths Metal Centres Limited also boasts an in-house UKAS Accredited Testing Laboratory which is unique within the multi-metal and plastic stockholding sector. We believe this underlines our total commitment to quality and our ethos of being the complete service provider.

Additional Info

A technical datasheet for NES 780 is available in PDF file format. To view and download, please click here.

We offer in-house processing options - for more information, please refer to our processing services.

Read our corporate brochure by clicking here.

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