Leaded Tin Bronze – Copper Casting Alloy UNS C92300

Topics Covered

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

Introduction

Pure copper has good electrical and thermal conductivity. More than 400 varieties of copper alloys are available. Alloys can be freely formed by copper than most metals.

The following datasheet gives an overview of the UNS C92300 copper casting alloy.

Chemical Composition

The chemical composition of the UNS C92300 copper alloy is outlined in the following table.

Element Content (%)
Cu 85.0-89.0
Sn 7.0-9.0
Zn 2.50-5.0
Pb 1.0
Ni 1.0
Sb 0.25
Fe 0.25
P 0.050
S 0.050
Si 0.0050
Al 0.0050

Physical Properties

The following table shows physical properties of the UNS C92300 copper alloy.

Properties Metric Imperial
Density 8.80 g/cm3 0.318 lb/in³

Mechanical Properties

The mechanical properties of the UNS C92300 copper alloy are tabulated below.

Properties Metric Imperial
Hardness, Brinell 70 70
Tensile strength 275 MPa 39900 psi
Yield strength (@ 0.500%) 138 MPa 20000 psi
Elongation at break (in 50 mm) 25% 25%
Modulus of elasticity 117 GPa 17000 ksi
Compressive strength (at permanent set of 0.1%) 69.0 MPa 10000 psi
Compressive strength (at permanent set of 10%) 240 MPa 34800 psi
Izod impact 18.3 J 13.5 ft-lb
Machinability (UNS C36000 (free-cutting brass) = 100) 42 42
Poisson's ratio 0.34 0.34

Thermal Properties

The thermal properties of the UNS C92300 copper alloy are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@ 20-177°C/68-351°F) 18 µm/m°C 10 µin/in°F
Thermal conductivity 75 W/mK 521 BTU in/hr.ft².°F

Other Designations

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Other designations that are equivalent to the UNS C92300 copper alloy include:

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

Fabrication and Heat Treatment

Machinability

The machinability rating of the UNS C92300 copper alloy is 42.

Welding

The UNS C92300 copper alloy can be welded using brazing and soldering processes. Carbon arc welding, oxyacetylene welding, coated metal arc welding, and gas shielded arc welding methods

Heat Treatment

The UNS C92300 copper alloy can be stress relieved at 260°C (500°F). The time taken for stress relieving is about 1 hr/ in. section thickness. It does not respond to heat treatment.

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