High-Leaded Tin Bronze - Copper Casting Alloy UNS C93900

Topics Covered

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

Introduction

The UNS C93900 alloy is a high-leaded tin bronze copper casting alloy. Other types of bronze alloys include phosphor bronze, tin bronze, aluminum bronze, silicon bronze, architectural bronze and manganese bronze.

The following datasheet provides an overview the UNS C93900 alloy.

Chemical Composition

The chemical composition of the UNS C93900 alloy is outlined in the following table.

Element Content (%)
Cu 76.5-79.5
Pb 14.0-18.0
Sn 5.0-7.0
Zn 1.50
Ni 0.80
Fe 0.40
P 0.050

Physical Properties

The following table shows the physical properties of the UNS C93900 alloy.

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

Mechanical Properties

The mechanical properties of UNS C93900 alloy are displayed in the following table.

Properties Metric Imperial
Hardness, Brinell (typically) 63 63
Tensile strength 220 MPa 31900 psi
Yield strength (@strain 0.500 %) 150 MPa 21800 psi
Elongation at break (in 50 mm) 7.00% 7.00%
Machinability (UNS C36000 (free-cutting brass) = 100) 80 80
Poisson's ratio 0.34 0.34
Elastic modulus 117 GPa 16969 ksi

Thermal Properties

The thermal properties of UNS C93900 alloy are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@20-204°C/68-399°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 materials to UNS C93900 alloy are:

  • ASTM B30
  • ASTM B505
  • QQ C390

Fabrication and Heat Treatment

Welding

Soldering is suitable for UNS C93900 alloy. Welding processes not recommended for this alloy include brazing, gas shielded arc welding, carbon arc welding, coated metal arc welding and oxyacetylene welding.

Machinability

The machinability rating of UNS C93900 alloy is 80.

Heat Treatment

UNS C93900 alloy has stress relieving temperature of 260°C (500°F). This alloy does not react to heat treatment. The time at temperature for this alloy is one hour per inch of section thickness.

Applications

UNS C93900 alloy is used for pump bodies, bearings, mine water impellers and continuous castings.

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