Nickel Silver 55-18 – Copper Alloy UNS C77000

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
     Machinability
     Welding
     Hot Working
     Cold Working
     Annealing

Introduction

Pure copper has good electrical and thermal conductivity. Alloys can be freely formed by copper than most metals. More than 400 varieties of copper alloys are available. The UNS nickel silver 55-18 copper alloy is available as wire, rod, and flat products.

The following datasheet gives an overview of the UNS C77000 copper alloy.

Chemical Composition

The following table shows the chemical composition of UNS C77000 copper alloy.

Element Content (%)
Cu 55
Zn 27
Ni 18

Physical Properties

The physical properties of UNS C77000 copper alloy are tabulated below.

Properties Metric Imperial
Density 8.70 g/cm3 0.314 lb/in³

Mechanical Properties

The mechanical properties of the UNS C77000 copper alloy are outlined in the following table.

Properties Metric Imperial
Tensile strength 414-1000 MPa 60000-145000 psi
Yield strength (depending on temper) 186-621 MPa 27000-90100 psi
Elongation at break (in 50.8 mm) 40.00% 40.00%
Elastic modulus 117 GPa 17000 ksi
Poisson’s ratio 0.34 0.34
Machinability (UNS C36000 (free-cutting brass) = 100) 30 30
Shear modulus 47 GPa 6820 ksi

Thermal Properties

The thermal properties of UNS C77000 copper alloy are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@ 20-300°C/68-572°F) 16.7 µm/m°C 9.28 µin/in°F
Thermal conductivity (@ 20°C/68°F) 29 W/mK 201 BTU in/hr.ft.°F

Other Designations

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Other designations that are equivalent to UNS C77000 copper alloy include:

  • ASTM B122
  • ASTM B151
  • QQ W321
  • SAE J461
  • SAE J463

Fabrication and Heat Treatment

Machinability

The machinability rating of UNS C77000 copper alloy is 30.

Welding

Brazing, soldering, gas shielded arc welding, seam welding, spot welding, butt welding, and oxyacetylene welding techniques are used for welding UNS C77000 copper alloy. Coated metal arc welding method is not suitable for welding this alloy.

Hot Working

UNS C77000 copper alloy has poor hot forming capacity.

Cold Working

UNS C77000 copper alloy has good cold working capacity.

Annealing

UNS C77000 copper alloy can be annealed at 594 to 816°C (1100 to 1500°F).

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