High-Leaded Tin Bronze, UNS C93700, Copper Casting Alloy (SAE 64)

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 C93700 copper casting alloy is an alloy of copper-tin-lead. The addition of nickel in the alloy enhances the strength and ductility. UNS C93700 copper alloy is resistant to biofouling and corrosion.

The following datasheet provides the chemical composition and properties of UNS C93700 alloy.

Chemical Composition

The chemical composition of UNS C93700 copper alloy is given in the following table.

Element Content (%)
Cu 80
Pb 10
Sn 10

Physical Properties

The following table details the physical properties of UNS C93700 alloy.

Properties Metric Imperial
Density 8.95 g/cm3 0.323 lb/in³

Mechanical Properties

The mechanical properties of UNS C93700 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 60 60
Elongation at break 20.0% 20.0%
Machinability 80 80
Izod impact 7.00 J 5.16 ft.lb
Compressive strength 90.0 MPa 13100 psi
Fatigue strength 90.0 MPa 13100 psi
Charpy impact 15.0 J 11.1 ft.lb

Thermal Properties

The following table outlines the thermal properties of UNS C93700 alloy.

Properties Metric Imperial
Thermal expansion co-efficient (@ 100°C/212°F) 17.8 µm/m°C 9.89 µin/in°F
Thermal conductivity (@20°C/68°F) 46.9 W/mK 325 BTU in/hr.ft²°F

Other Designations

Equivalent designations to UNS C93700 copper alloy include:

  • AMS 4827
  • AMS 4842
  • ASME SB584
  • ASTM B271
  • ASTM B30
  • ASTM B505
  • ASTM B584
  • ASTM B763
  • QQ C390
  • SAE J461
  • SAE J462

Fabrication and Heat Treatment

Machinability

UNS C93700 alloy has a machinability rating of 80.

Welding

The preferred welding techniques for UNS C93700 copper alloy are soldering and 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 C93700 alloy is 260°C (500°F). UNS C93700 copper alloy does not respond to heat treatment.


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