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.

(Materials Data)

• Cast copper alloy C96300 (Copper-Nickel)
• Cast copper alloy C96400 (70-30 Copper-Nickel)
• Cast copper alloy C97300 (Nickel-Silver 12% Ni)
• Cast copper alloy C97600 (Nickel-Silver 20% Ni)
• Cast copper alloy C97800 (Nickel-Silver 25% Ni)

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• Cast Coppers and high copper alloys
• Cast brasses
• Cast manganese bronzes
• Cast silicon bronzes and silicon brasses
• Cast tin bronzes and leaded tin bronzes
• Cast aluminum bronzes
• Cast copper-lead alloys
• Cast copper special alloys
• Spinodal Bronzes

• Wrought copper-nickel alloys and Nickel Silvers
• Classification of copper alloys
• Temper designation of copper alloys
• Treatment of molten copper alloys

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