Copper Alloy (UNS C94300)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
     Machinability
     Welding
     Heat Treatment
Applications

Introduction

Nearly 400 different kinds of copper alloys are available. Pure copper has high thermal and electrical conductivity. Tin bronze has high corrosion resistance. It is more ductile and stronger when compared to red and semi red brasses.

The following datasheet gives an overview of UNS C94300 copper alloy.

Chemical Composition

The following table shows chemical composition of UNS C94300 copper alloy.

Element Content (%)
Copper, Cu 68.5 - 73.5
Lead, Pb 22- 25
Tin. Sn 4.50 - 6
Antimony, Sb ≤ 0.70
Nickel, Ni ≤ 0.70
Zinc, Zn ≤ 0.50
Iron, Fe ≤ 0.15
Sulfur, S ≤ 0.080
Phosphorus, P ≤ 0.050

Physical Properties

The physical properties of UNS C94300 copper alloy are tabulated below.

Properties Metric Imperial
Density 9.29 g/cm3 0.336 lb/in3

Mechanical Properties

The mechanical properties of UNS C94300 copper alloy are outlined in the following table.

Properties Metric Imperial
Tensile strength 185 MPa 26800 psi
Yield strength (@ 0.500%) 90.0 MPa 13100 psi
Poisson's ratio 0.34 0.34
Elongation at break (in 50 mm) 10% 10%
Reduction of area 8% 8%
Elastic modulus 117 GPa 17000 ksi
Izod impact 7.00 J 5.16 ft-lb
Hardness, Brinell 48 48
Machinability (UNS C36000 (free-cutting brass) = 100) 80 80

Thermal Properties

The thermal properties of UNS C94300 copper alloy are given in the following table.

Properties Metric Imperial
Thermal conductivity (@ 20°C/68°F) 62.7 W/mK 435 BTU in/hr.ft2.°F

Other Designations

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Other designations that are equivalent to UNS C94300 copper alloy include:

  • ASTM B271
  • ASTM B30
  • ASTM B505
  • ASTM B584
  • ASTM B66
  • ASTM B763
  • QQ C390
  • SAE J461
  • SAE J462

Fabrication and Heat Treatment

Machinability

The machinability rate of UNS C94300 copper alloy is 80.

Welding

UNS C94300 copper alloy can be welded using soldering and brazing processes. Carbon arc welding, oxyacetylene welding, coated metal arc welding, and gas shielded arc welding techniques are not recommended for welding this alloy.

Heat Treatment

UNS C94300 copper alloy can be stress relieved at 260°C (500°F). The time taken for stress relieving is about 1 hr/ in. of section thickness. It does not respond to heat treatment.

Applications

UNS C94300 copper alloy can be used in high-speed bearings for light loads.

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