Leaded High-Strength Yellow Brass UNS C86700

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 UNS C86700 is a cast alloy of manganese bronze and leaded manganese bronze. The lead in the alloy gives an attractive golden color where as the manganese in the alloy gives chocolate brown color. UNS C86700 alloy is preferred in architecture for its color and longevity.

The following datasheet provides chemical composition and properties of UNS C86700 alloy.

Chemical Composition

The chemical composition of UNS C86700 alloy is given in the following table.

Element Content (%)
Cu 58
Zn 41
Pb 1

Physical Properties

The following table details the physical properties of UNS C86700 alloy.

Properties Metric Imperial
Density 8.32 g/cm3 0.301 lb/in³

Mechanical Properties

The mechanical properties of UNS C86700 alloy are shown in the following table.

Properties Metric Imperial
Elastic modulus 117 GPa 16969 ksi
Poisson's ratio 0.34 0.34
Hardness, Rockwell B 155 155
Tensile strength 585 MPa 84800 psi
Yield strength 290 MPa 42100 psi
Elongation at break 20.00% 20.00%
Machinability 55 55

Thermal properties

The following table discusses the thermal properties of UNS C86700 alloy.

Properties Metric Imperial
Thermal expansion co-efficient (@20-200°C/68-392°F) 19.0 µm/m°C 10.6 µin/in°F

Other Designations

Equivalent designations to UNS C86700 alloy include:

  • ASTM B271
  • ASTM B30
  • ASTM B584
  • ASTM B763

Fabrication and Heat Treatment

Machinability

UNS C86700 alloy has a machinability rating of 55.

Welding

The preferred welding techniques for UNS C86700 alloy 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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