High-Leaded Tin Bronze UNS C93800 Copper Casting Alloy

Sep 18 2012

Topics Covered

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

Introduction

High-leaded tin bronze UNS C93800 copper casting alloy is an alloy of copper-tin-lead. The addition of nickel in the alloy enhances the strength and ductility. UNS C93800 copper alloy is resistant to biofouling and corrosion.

The following datasheet provides the chemical composition and properties of UNS C93800 alloy.

Chemical Composition

The chemical composition of UNS C93800 copper alloy is given in the following table.

Element Content (%)
Cu 75.0 - 79.0
Pb 13.0 - 16.0
Sn 6.30 - 7.50
Fe 0.15
Ni 0.70
P 0.050
Si 0.0030
Zn 0.70

Physical Properties

The following table details the physical properties of UNS C93800 alloy.

Properties Metric Imperial
Density 9.25 g/cm3 0.334 lb/in³

Mechanical Properties

The mechanical properties of UNS C93800 copper alloy are shown in the following table.

Properties Metric Imperial
Elastic modulus 117 GPa 16969 ksi
Poisson's ratio 0.34 0.34
Hardness, Brinell 55 55
Elongation at break 18.0% 18.0%
Machinability 80 80
Izod impact 7.00 J 5.16 ft.lb
Compressive strength 83.0 MPa 12000 psi
Fatigue strength 69.0 MPa 10000 psi

Thermal Properties

The following table outlines the thermal properties of UNS C93800 alloy.

Properties Metric Imperial
Thermal expansion co-efficient (@20.0 - 205°C/68.0 - 401°F) 18.5 µm/m°C 10.3 µin/in°F
Thermal conductivity (@20°C/68°F) 52.0 W/mK 361 BTU in/hr.ft²°F

Other Designations

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Equivalent designations to UNS C93800 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

UNS C93800 has a machinability rating of 80.

Welding

The preferred welding technique for UNS C93800 copper alloy is soldering. Brazing, carbon arc welding, oxyacetylene welding, gas shielded arc welding and coated metal arc welding are not recommended for this alloy.

Heat Treatment

The stress relieving temperature of UNS C93800 alloy is 260°C (500°F). It does not respond to heat treatment.


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