UNS C97800 Leaded Nickel Bronze - Copper Casting Alloy

Topics Covered

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

Introduction

UNS C97800 alloy is a leaded nickel bronze copper alloy. Other types of bronze alloys include phosphor bronze, tin bronze, aluminum bronze, silicon bronze, architectural bronze and manganese bronze.

The datasheet given below provides an overview of UNS C97800 alloy.

Chemical Composition

The chemical composition of the UNS C97800 alloy is outlined in the following table.

Element Content (%)
Cu 64.0-67.0%
Ni 24.0-27.0%
Sn 4.0-5.50%
Fe 1.50%
Zn 1.0-4.0%
Pb 1.0-2.50%
Mn 1.0%
Sb 0.20%
Si 0.15%
S 0.080%
P 0.050%
Al 0.0050%

Physical Properties

The following table shows the physical properties of UNS C97800 alloy.

Properties Metric Imperial
Density 8.86 g/cm3 0.320 lb/in³

Mechanical Properties

The mechanical properties of UNS C97800 alloy are displayed in the following table.

Properties Metric Imperial
Hardness, Brinell (3000 kg) 130 130
Tensile strength 380 MPa 55100 psi
Yield strength (@strain 0.500 %) 205 MPa 29700 psi
Elongation at break (in 50 mm) 15.00% 15.00%
Machinability (UNS C36000 (free-cutting brass) = 100) 60 60
Poisson's ratio 0.34 0.34
Elastic modulus 117 GPa 16969 ksi

Thermal Properties

The thermal properties of UNS C97800 alloy are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@20-260°C/68-500°F) 17.5 µm/m°C 9.72 µin/in°F
Thermal conductivity (@20°C/68°F) 25.4 W/mK 176 BTU in/hr.ft².°F

Other Designations

Equivalent materials to UNS C97800 alloy are:

  • ASTM B271
  • ASTM B30
  • ASTM B505
  • ASTM B584
  • ASTM B763
  • MIL V-18436

Fabrication and Heat Treatment

Welding

Welding processes suitable for UNS C97800 alloy include brazing and soldering. Welding processes not suitable for this alloy include coated metal arc welding, gas shielded arc welding, oxyacetylene welding and carbon arc welding is rated.

Machinability

The machinability rating of UNS C97800 alloy is 60.

Heat Treatment

UNS C97800 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 C97800 alloy is used for musical instrument components, valve seats, sanitary and ornamental castings and valves.

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