UNS C31600 Leaded Nickel-Bearing Bronze

Topics Covered

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

Introduction

UNS C31600 leaded nickel-bearing bronze is an alloy containing copper, zinc and lead in specific amounts. It has excellent corrosion resistance and cold workability. C31600 alloy is generally stronger than C31400 alloy.

The following datasheet will discuss in detail about the UNS C31600 leaded nickel-bearing bronze.

Chemical Composition

The following table shows the chemical composition of UNS 31600 leaded bronze alloys.

Element Content (%)
Cu 89
Pb 1
Ni 1
Zn 8.1

Physical Properties

The physical properties of UNS C31600 leaded bronze alloys are given in the following table.

Properties Metric Imperial
Density 8.86 g/cm3 0.320 lb/in3
Melting point 1010°C 1850°F

Mechanical Properties

The mechanical properties of UNS C31600 leaded bronze alloys are tabulated below.

Properties Metric Imperial
Tensile strength 255-462 MPa 37000-67000 psi
Yield strength (depending on temper) 83.0-407 MPa 12000-59000 psi
Elongation at break 45.00% 45.00%
Modulus of elasticity (in 304.8 mm) 115 GPa 16700 ksi
Machinability (UNS C36000 (free-cutting brass) = 100%) 80% 80%

Thermal Properties

The thermal properties of UNS C31600 leaded bronze alloys are tabulated below.

Properties Metric Imperial
Thermal expansion coefficient (@20.0 - 300°C/ 68.0 - 572°F) 18.4 µm/m°C 10.2 µin/in°F
Thermal conductivity (@20.0°C/ 68.0°F) 140 W/mK 972 BTU-in/hr.ft².°F

Other Designations

Other designations that are equivalent to UNS C31600 leaded bronze alloys include:

  • ASTM B140
  • MIL V-18436

Fabrication and Heat Treatment

Machinability

The machinability rate of C31600 leaded bronze alloys is 80.

Welding

C31600 leaded bronze alloys can be welded using soldering, brazing and butt welding. For this type of alloys, oxyacetylene welding, gas shielded arc welding, coated metal arc welding, seam welding and spot welding are not preferred.

Hot Working

C31600 leaded bronze alloys have poor hot working property.

Cold Working

C31600 leaded bronze alloys have good cold working property.

Annealing

Annealing of C31600 leaded bronze alloys is performed at temperatures ranging from 427 to 649°C (800 to 1200°F).

Applications

The following are the major applications of UNS C31600 leaded bronze alloys:

  • Architectural hardware
  • Pole line hardware
  • Fasteners

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