High Strength Yellow Brass – Copper Casting Alloy UNS C86500

Topics Covered

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

Introduction

High strength yellow brass – copper casting alloy UNS C86500 is a cast alloy consisting mainly if copper and zinc. UNS C86500 is preferred by architects for its color and longevity. The lead in the alloy gives it a golden color where as the manganese gives chocolate brown color.

The following datasheet provides chemical composition and properties of copper casting alloy UNS C86500.

Chemical Composition

The chemical composition of UNS C86500 is given in the following table.

Element Content (%)
Copper, Cu 55.0-60.0
Zinc, Zn 39.0
Manganese, Mn ≤1.50
Iron, Fe 0.4-2.0
Nickel, Ni ≤1.0
Tin, Sn ≤1.0
Lead, Pb ≤0.4
Aluminium, Al 0.5-1.5

Physical Properties

The following table details the physical properties of copper casting alloy UNS C86500.

Properties Metric Imperial
Density 8.30 g/cc 0.300 lb/in³

Mechanical Properties

The mechanical properties of UNS C86500 are shown in the following table.

Properties Metric Imperial
Elastic modulus 117 GPa 16969 ksi
Poisson's ratio 0.34 0.34
Hardness, Brinell 130 130
Tensile strength 490 MPa 71100 psi
Yeild strength 195 MPa 28300 psi
Elongation at break 30.00% 30.00%
Machinability 26 26
Reduction of area 26.00% 26.00%
Rupture strength 85.0 MPa 12300 psi
Creep strength 12.0 MPa 1740 psi
Compressive strength 165 MPa 23900 psi
Charpy impact 42.0 J 31.0 ftlb
Fatigue strength 130-150 MPa 18900-21800 psi

Thermal Properties

The following table outlines the thermal properties of copper casting alloy UNS C86500.

Properties Metric Imperial
Thermal expansion co-efficient (@105°C/221°F) 18.0 µm/m°C- 10.0 µin/in°F
Thermal conductivity (@20.0°C/68.0°F ) 87.0 W/m-K 604 BTUin/hr.ft².°F

Other Designations

Equivalent designations to copper alloy UNS C86500 include:

  • ASTM B176
  • ASTM B30
  • ASTM B505
  • ASTM B584
  • ASTM B763
  • QQ C390
  • QQ C523
  • SAE J461
  • SAE J462

Fabrication and Heat Treatment

Machinability

Copper casting alloy UNS C86500 has a machinability rating of 26.

Welding

The preferred welding techniques for UNS C86500 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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