C92900 Leaded Nickel Tin Bronze

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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.

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