Copper-Nickel Alloy (UNS C72900)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication

Introduction

Copper alloys are of many types. The addition of various other elements provides each alloy its distinct characteristics. The addition of nickel to a copper alloy improves strength and corrosion resistance. Copper nickel alloys are also called cupronickel alloys.

The following datasheet discusses the chemical composition and properties of copper UNS C72900.

Chemical Composition

The chemical composition of UNS C72900 copper alloy is outlined in the following table.

Element Content (%)
Nickel, Ni 14.5-15.5
Tin, Sn 7.5-8.5
Iron, Fe 0.5
Zinc, Zn 0.5
Manganese, Mn 0.3
Magnesium, Mg 0.15
Niobium, Nb 0.1
Lead, Pb 0.02
Copper, Cu Balance

Physical Properties

The following table discusses the physical properties of copper UNS C72900.

Properties Metric Imperial
Density 8.8 g/cm3 0.321 lb/in3

Mechanical Properties

The mechanical properties of UNS C72900 copper wire (TF00–temper) are tabulated below.

Properties Metric Imperial
Tensile strength 1103 MPa 160 ksi

Other Designations

Equivalent material to UNS C72900 copper alloy is ASTM B740.

Fabrication

Welding - Soldering, seam welding, spot welding, butt welding, coated metal arc welding, brazing, gas shielded arc welding are all excellent methods. Oxyacetylene welding can also be used.

Forging - The hot forging temperature for copper UNS C72900 alloy ranges between 649 and 871°C (1200 and 1600°F).

Hot working - Copper UNS C72900 alloy has good hot working abilities.

Cold working - Copper UNS C72900 alloy has excellent cold working properties.

Annealing - Copper UNS C72900 alloy is annealed at temperatures 824ºC (1515ºF).

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