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Cast copper-nickel alloys and Nickel Silvers

Dr. Dmitri Kopeliovich

According to the Unified Numbering System (UNS):

Cast Copper-Nickel Alloys (Copper-Nickels, Cupro-Nickels) are copper alloys, containing 9-31% of nickel (Ni) as the major alloying element. Cast Copper-Nickel alloys are designated with the numbers from C96000 through C96999.

Cast Copper-Nickel alloys may contain up to 8% of tin (Sn), up to 1.4% of iron (Fe) , up to 1% of manganese (Mn), up to 1% of niobium (Nb) and up to 1.1% of beryllium (Be)as additional alloying elements.

Cast Copper-nickel-zinc alloys form a separate group called nickel silvers.

Cast Copper-Nickel-Zinc Alloys (Nickel Silvers) are copper alloys containing 12.5-25.5% of nickel (Ni) and 2.5-21% of zinc (Zn) as the major alloying elements. Cast Copper-Nickel-Zinc alloys are designated with the numbers from C97000 through C97999.

Wrought Copper-Nickel-Zinc alloys may contain 2.5-5% of tin (Sn) and 2-9.5% of lead (Pb) as additional alloying elements.

Cast Copper-Nickel alloys and most of cast Copper-Nickel-Zinc alloys have mono-phase structure (α-phase).

Cast Copper-Nickel and cast Copper-Nickel-Zinc alloys have moderate mechanical strength and high ductility combined with very good corrosion resistance (particularly in sea water).

Iron, manganese and niobium are added to the cast Copper-Nickel alloys for increasing their hardness and strength.

Separate group of copper-nickel alloys is Spinodal Bronzes: copper-nickel-tin alloys possessing high mechanical strength due to a controlled heat treatment called Spinodal decomposition.

Cast Copper-Nickel alloys are used for manufacturing pump bodies, bearings, bushings, steam fittings, boat part, valves and fittings resistant to corrosion in sea water, plastic molds tooling.

Cast Copper-Nickel alloys (Nickel Silvers) are used in decorative applications and for manufacturing marine furniture, sanitary fittings, fittings for food processing, valves, pumps, window hardware, components of musical instruments.

Chemical compositions of some cast copper-nickel alloys and Nickel Silvers

UNS Designation Trade mark Ni,% Fe,% Zn,% Sn,% Others,% Cu,%
C96300 Copper-Nickel 18.0-22.0 0.5-1.5 - - Nb0.5-1.5Mn 0.25-1.5 balance
C96400 70-30 Copper-Nickel 28.0-32.0 0.25-1.5 - - Nb0.5-1.5 balance
C96970 Copper-Nickel 8.5-9.5 0.5 max. - 5.5-6.5 - balance
C97300 Nickel Silver (12% Ni) 11.0-14.0 1.5 max. 17.0-25.0 1.5-3.0 Pb8.0-11.0 balance
C97600 Nickel Silver (20% Ni) 19.0-21.5 1.5 max. 3.0-9.0 3.5-4.5 Pb3.0-5.0 balance
C97800 Nickel Silver (25% Ni) 24.0-27.0 1.5 max. 1.0-4.0 4.0-5.5 Pb1.0-2.5 balance

Properties of some cast copper-nickel alloys and Nickel Silvers

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cast_copper-nickel_alloys_and_nickel_silvers.txt · Last modified: 2013/04/06 by dmitri_kopeliovich
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