Ferroalloys

Copper Alloys

Copper and copper alloys have been used for many years to handle water and seawater.  The addition of nickel to copper improves the strength, wear resistance, erosion resistance and corrosion resistance.  Copper-nickel alloys with 10% and 30% nickel are used widely for seawater pipe work and heat exchangers.  They also retain the resistance to marine fouling which is displayed by copper.  A related alloy is nickel- 35% copper which has a precipitation hard enable variant.  They are used for seawater handling and in chemical plants.

•    1265  CA-706 Copper-Nickel Alloy Hulls: The Copper Mariner's Experience and Economics
•    12003  Guidelines for the Use of Copper Alloys in Seawater
•    12007  Copper-Nickel Alloys - Properties and Applications
•    12014  Copper-Nickel Fabrication
The Copper Development Association has developed a series of five video presentations covering the welding of copper-nickel alloys:
•    Cleaning and Preparation for Welding of Copper Nickel Alloy Part 1 of 5
•    TIG Welding Copper Nickel Alloy Part 2 of 5
•    Pipe Welding Copper Nickel Alloy Part 3 of 5
•    Shielded Metal Arc Welding Copper Nickel Alloy Part 4 of 5
•    Pulsed MIG Welding Copper Nickel Alloy Part 5 of 5
Copper-nickel alloys are also widely used for coinage because of their combination of wear and corrosion resistance, physical properties and ability to be coined.
Nickel aluminium bronze is used for ships’ propellers where a combination of mechanical strength, corrosion resistance and erosion resistance is needed.

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