Leaded High Strength Yellow Brass – Copper Casting Alloy UNS C86400

Topics Covered

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

Introduction

Leaded high strength yellow brass – copper casting alloy UNS C86400 is a cast brass alloy of manganese bronze and leaded manganese bronze. The chocolate color of UNS C86400 can be attributed to the manganese present in the alloy. The leaded brass is commonly called as architectural bronze. The lead in the alloy enhances the longevity of the alloy and gives it an attractive golden lustre.

The following datasheet provides the chemical composition and properties of copper alloy UNS C86400.

Chemical Composition

The chemical composition of UNS C86400 is given in the following table.

Element Content (%)
Copper , Cu 56.0-62.0
Zinc, Zn 37.0-40.0
Lead, Pb 0.50-1.50
Iron ≤2.00
Manganese, Mn ≤1.50
Tin, Sn ≤1.50
Aluminium, Al ≤1.50
Nickel ≤1.00

Physical Properties

The following table details the physical properties of copper alloy UNS C86400.

Properties Metric Imperial
Density 8.32 g/cc 0.301 lb/in³

Mechanical Properties

The mechanical properties of UNS C86400 are shown in the following table.

Properties Metric Imperial
Elastic modulus 117 GPa 16969 ksi
Poisson's ratio 0.34 0.34
Hardness, Brinell 105 105
Tensile strength 450 MPa 65300 psi
Yield strength 170 MPa 24700 psi
Elongation at break 20.00% 20.00%
Machinability 60 60
Compressive strength 150 MPa 21800 psi
Charpy impact 34.0 J 25.1 ftlb
Izod impact 40.0 J 29.5 ftlb

Thermal Properties

The following table outlines the thermal properties of copper alloy UNS C86400.

Properties Metric Imperial
Thermal expansion co-efficient (@21.0 – 204°C/69.8-399°F) 20.0 µm/m°C 11.1 µin/in°F
Thermal conductivity (@20°C/68°F) 88.0 W/mK 611 BTU in/hr.ft².°F

Other Designations

Equivalent designations to UNS C86400 include:

  • ASTM B271
  • ASTM B30
  • ASTM B505
  • ASTM B584
  • ASTM B763
  • QQ C390
  • QQ C523

Fabrication and Heat Treatment

Machinability

Copper alloy UNS C86400 has a machinability rating of 65.

Welding

The preferred welding techniques for UNS C86400 are soldering and brazing. Carbon arc welding, oxyacetylene welding, gas shielded arc welding and coated metal arc welding are not recommended for this alloy.

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