Nov 12 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesOther DesignationsFabrication and Heat Treatment Machinability Welding Heat Treatment
Introduction
Leaded nickel-tin bronze UNS C92900 is a cast alloy of copper-tin-lead. The addition of nickel in the alloy enhances the strength and ductility. UNS C92900 copper alloy is resistant to corrosion and biofouling.
The following datasheet provides the chemical composition and properties of UNS C92900.
Chemical Composition
The chemical composition of UNS C92900 copper alloy is given in the following table.
Element |
Content (%) |
Cu |
84 |
Pb |
2.5 |
Sn |
10 |
Ni |
3.5 |
Physical Properties
The following table details the physical properties of UNS C92900.
Properties |
Metric |
Imperial |
Density |
8.79 g/cc |
0.318 lb/in³ |
Mechanical Properties
The mechanical properties of UNS C92900 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 |
80 |
80 |
Tensile strength |
325 MPa |
47100 psi |
Yield strength |
180 MPa |
26100 psi |
Elongation at break |
20.0% |
20.0% |
Machinability |
40 |
40 |
Izod impact |
16.0 J |
11.8 ft.lb |
Thermal Properties
The following table outlines the thermal properties of UNS C92900.
Properties |
Metric |
Imperial |
Thermal expansion co-efficient (@20.0 – 200°C/68 - 392°F) |
17.0 µm/m°C |
9.44 µin/in°F |
Thermal conductivity (@20°C/68°F) |
58.2 W/mK |
404 BTU in/hr.ft²°F |
Other Designations
Equivalent designations to UNS C92900 copper alloy include:
- ASTM B30
- ASTM B427
- ASTM B505
- SAE J461
- SAE J462
Fabrication and Heat Treatment
Machinability
UNS C92900 has a machinability rating of 40.
Welding
The preferred welding techniques for UNS C92900 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 the UNS C92900 alloy is 260°C (500°F). The alloy does not respond to heat treatment.