Copper - Nickel Silver Alloy (UNS C76400)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Applications

Introduction

Pure copper has the best electrical and thermal conductivity of any commercial metal. It forms alloys more freely than most of the metals. Copper UNSC76400 is a nickel silver alloy that has pleasing silver-like color, good corrosion and tarnish-resistance performance, and good formability.

The following datasheet discusses the chemical composition and properties of copper UNS C76400.

Chemical Composition

The chemical composition of copper UNS C76400 is given in the following table.

Element Content (%)
Copper, Cu 60-63
Nickel, Ni 17-19
Manganese, Mn 0.5
Iron, Fe 0.25
Lead, Pb 0.05
Zinc, Zn Balance

Physical Properties

The following table discusses the physical properties of copper UNS C76400.

Properties Metric Imperial
Density 8.7 g/cm3 0.314 lb/in3

Mechanical Properties

The mechanical properties of UNS C76400 copper wire (annealed) are tabulated below.

Properties Metric Imperial
Tensile strength 413 MPa 60 ksi
Modulus of elasticity 12500 kg/mm2 18000 ksi

Thermal Properties

The following table discusses the thermal properties of copper UNS C76400.

Properties Metric Imperial
Thermal conductivity 0.07 cal/cm2/cm/sec/°C 17 BTU/ft2/ft/hr/°F
Coefficient of thermal expansion 16.7µm/m°C 9.3 µin/in°F

Other Designations

Equivalent materials to UNS C76400 copper alloy are included in the following list:

  • ASTM B151
  • ASTM B206
  • QQ W321.

Applications

Copper UNS C76400 finds application in:

  • Camera parts
  • Optical instrument components
  • Radio dials
  • Costume jewelry
  • Zippers
  • Table flatware and hollowware
  • Musical instrument components.

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