Leaded Nickel Bronze- Copper Alloy UNS C97600

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
     Heat Treatment


UNS C97600 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 C97600 alloy.

Chemical Composition

The chemical composition of UNS C97600 alloy is outlined in the following table.

Element Content (%)
Cu 63.0-67.0
Ni 19.0-21.5
Sn 3.50-4.50
Zn 3.0-9.0
Pb 3.0-5.0
Fe 1.50
Mn 1.0
Sb 0.25
Si 0.15
S 0.080
P 0.050
Al 0.0050

Physical Properties

The following table shows the physical properties of UNS C97600 alloy.

Properties Metric Imperial
Density 8.90 g/cm3 0.322 lb/in³

Mechanical Properties

The mechanical properties of UNS C97600 alloy are displayed in the following table.

Properties Metric Imperial
Hardness, Brinell (500 kg) 80 80
Tensile strength 310 MPa 45000 psi
Yield strength (@strain 0.500 %) 165 MPa 23900 psi
Elongation at break (in 50 mm) 20.00% 20.00%
Creep strength (for 10E-5%/h, at 290°C) 153 MPa 22200 psi
Creep strength (for 10E-5%/h, at 230°C) 224 MPa 32500 psi
Compressive strength (at permanent set of 1%) 205 MPa 29700 psi
Compressive strength (at permanent set of 10%) 395 MPa 57300 psi
Charpy impact (V-notch) 15.0 J 11.1 ft-lb
Fatigue strength (@# of cycles 1.00e+8/reverse bending) 107 MPa 15500 psi
Machinability (UNS C36000 (free-cutting brass) = 100) 70% 70%
Poisson's ratio 0.34 0.34
Elastic modulus 117 GPa 16969 ksi

Thermal Properties

The thermal properties of UNS C97600 alloy are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@20-300°C/68-572°F) 17.0 µm/m°C 9.44 µin/in°F
Thermal conductivity (@20°C/68°F) 22.0 W/mK 153 BTU in/hr.ft².°F

Other Designations

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Equivalent materials to UNS C97600 alloy are:

  • ASME SB584
  • ASTM B271
  • ASTM B30
  • ASTM B505
  • ASTM B584
  • ASTM B763
  • MIL V-18436
  • SAE J461
  • SAE J462

Fabrication and Heat Treatment


Welding processes suitable for UNS C97600 are brazing and soldering. Welding processes not suitable for this alloy include coated metal arc welding, oxyacetylene welding, gas shielded arc welding and carbon arc welding.


The machinability rating of UNS C97600 alloy is 70.

Heat Treatment

UNS C97600 alloy has stress relieving temperature of 500 F or 260 C. This alloy does not react to heat treatment. The time at temperature for this alloy is one hour per inch of section thickness.


UNS C97600 alloy is used in pumps, marine castings, valves, ornamental hardware and sanitary fittings.

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