High Level Leaded Brass – Copper Alloy C48500

Topics Covered

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

Introduction

Brass is a specific term that refers to a variety of copper-zinc alloys having properties that include electrical and thermal conductivity, strength, hardness, wear-resistance, ductility and corrosion-resistance.

Brasses are available in a wide range of colors such as yellow, red, silver and gold etc. These colored brasses are used by designers and architects to improve the inside and outside appearances of buildings.

The UNS C48500 copper alloy is a high-leaded naval brass alloy with good corrosion resistance, hot forgeability and free-cutting properties.

The following datasheet provides an overview of the UNS C48500 high level leaded brass copper alloy.

Chemical Composition

The chemical composition of the UNS C48500 high level leaded brass copper alloy is outlined in the following table.

Element Content (%)
Cu 60.0
Pb 1.75
Zn 37.5
Sn 0.75

Physical Properties

The following table shows the physical properties of the UNS C48500 high level leaded brass copper alloy.

Properties Metric Imperial
Density 8.44 g/cc 0.305 lb/in³
Melting point 888°C 1630°F

Mechanical Properties

The mechanical properties of the UNS C48500 copper alloy are displayed in the following table.

Properties Metric Imperial
Tensile strength 379-531 MPa 55000-77000 psi
Yield  strength (depending on temper) 172-365 MPa 24900-52900 psi
Elongation at break (in 381 mm) 40% 40%
Machinability (UNS C36000 (free-cutting brass) = 100) 70 70
Shear modulus 39 GPa 5660 ksi
Poisson's ratio 0.34 0.34
Elastic modulus 117 GPa 16969 ksi

Thermal Properties

The thermal properties of the UNS C48500 copper alloy are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (at 20-300°C/ 68-572°F) 21.2 µm/m°C 11.8 µin/in°F
Thermal conductivity 116 W/mK 805 BTU in/hr.ft².°F

Other Designations

Equivalent materials to the UNS C48500 copper alloy are:

  • ASTM B124
  • ASTM B21
  • ASTM B283
  • QQ B639.

Fabrication and Heat Treatment

Annealing

The UNS C48500 copper alloy is annealed between 427 and 593°C (800 and 1100°F).

Cold Working

The UNS C48500 copper alloy is rated with poor cold working capacity.

Welding

Welding processes recommended for the UNS C48500 copper alloy include brazing, butt welding and soldering. Welding processes not recommended for this alloy include seam welding, oxyacetylene welding, coated metal arc welding, spot welding and gas shielded arc welding.

Forging

The UNS C48500 copper alloy is forged between 649 and 760°C (1200 and 1400°F). The hot forgeability rating of this alloy is 90.

Machinability

The machinability rating of the UNS C48500 copper alloy is 70.

Hot Working

The UNS C48500 copper alloy has good hot forming capacity.

Applications

The UNS C48500 copper alloy is used for marine applications, high strength cold headed products and hardware and fasteners for corrosion resistant service.

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