Leaded Yellow Brass – Copper Casting Alloy UNS C85400

Aug 21 2012

Topics Covered

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

Introduction

Leaded yellow brass – copper casting alloy UNS C85400 has high machinability due to the presence of lead in the alloy. Lead works as a lubricant and microscopic chip breaker. UNS C85400 has good strength and resistance to corrosion. UNS C85400 copper alloy is an alloy of copper, zinc and lead which belongs to the cast alloys category.

The following datasheet provides chemical composition and properties of UNS C85400.

Chemical Composition

The chemical composition of UNS C85400 copper alloy is given in the following table.

Element Content (%)
Copper, Cu 65.0-70.0
Zinc, Zn 24.0-32.0
Lead, Pb 1.50-3.50
Tin, Sn 0.5-1.50
Iron, Fe ≤0.70
Aluminium, Al ≤0.35
Nickel, Ni ≤1.0
Silicon, Si ≤0.05

Physical Properties

The following table details the physical properties of UNS C85400.

Properties Metric Imperial
Density 8.45 g/cc 0.305 lb/in³

Mechanical Properties

The mechanical properties of UNS C85400 copper alloy are shown in the following table.

Properties Metric Imperial
Elastic modulus 117 GPa 16969 ksi
Poisson's ratio 0.34 0.34
Hardness, Brinell 50 50
Tensile strength 235 MPa 34100 psi
Yield strength 83.0 MPa 12000 psi
Elongation at break 35.00% 35.00%
Machinability 80 80

Thermal properties

The following table discusses the thermal properties of UNS C85400.

Properties Metric Imperial
Thermal expansion co-efficient (@20-100°C/68-212°F) 20.2 µm/m°C 11.2 µin/in°F
Thermal conductivity (@20°C/68°F) 88.0 W/mK 611 BTUin/hr.ft².°F

Other Designations

Equivalent designations to UNS C85400 copper alloy include:

  • ASTM B271
  • ASTM B30
  • ASTM B584
  • ASTM B763
  • QQ C390
  • SAE J461
  • SAE J462

Fabrication and Heat Treatment

Machinability

UNS C85400 has a machinability rating of 80.

Welding

The preferred welding techniques for UNS C85400 copper alloy are soldering, brazing and oxyacetylene welding. Gas shielded arc welding, coated metal arc welding and carbon arc welding are not recommended for this alloy.

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