Medium Leaded Brass-Copper Alloy UNS C48200

Topics Covered

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

Introduction

Copper can be formed into alloys more easily than most metals. It can also be combined with a wide range of alloying elements. Copper possesses excellent electrical and thermal conductivity of any commercial metal. There are 400 types of copper alloys with each comprising many properties that are suitable for various applications, manufacturing processes, and environments.

UNS C44500 alloys are a type of brass-copper alloys with medium leaded property. It is also known as naval brass. These alloys have good corrosion resistance and hot forgeability, and free-cutting features. The following datasheet will provide details about UNS C48200 medium leaded brass-copper alloys

Chemical Composition

The following table shows the chemical composition of the UNS C48200 medium leaded brass-copper alloys.

Element Content (%)
Cu, Copper 60.5
Pb, Lead 0.7
Sn, Tin 0.8
Zn, Zinc 38

Physical Properties

The physical properties of UNS C48200 medium leaded brass-copper alloys are outlined in the following table.

Properties Metric Imperial
Density 8.44 g/cm3 0.305 lb/in³
Melting point 888°C 1630°F

Mechanical Properties

The mechanical properties the UNS C48200 medium leaded brass-copper alloys are tabulated below.

Properties Metric Imperial
Tensile strength 386-517 MPa 56000-75000 psi
Yield strength (depending on temper) 172-365 MPa 24900-52900 psi
Elongation at break (in 381 mm) 43.00% 43.00%
Elastic modulus 117 GPa 17000 ksi
Poisson’s ratio 0.34 0.34
Machinability (UNS C36000 (free-cutting brass) = 100) 50 50
Shear modulus 39.0 GPa 5660 ksi

Thermal Properties

The thermal properties of the UNS C48200 medium leaded brass-copper alloys are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (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 UNS C48200 medium leaded brass-copper alloys are:

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

Fabrication and Heat Treatment

Machinability

The machinability rate of UNS C48200 medium leaded brass-copper alloys are 50.

Welding

Soldering, brazing, and butt welding are considered as suitable welding processes, whereas processes such as oxyacetylene welding, gas shielded arc welding, coated metal arc welding, spot welding, seam welding are not recommended for UNS C48200 alloys.

Forging

UNS C48200 alloys have a hot forgeability rating of 90 with the recommended hot working temperature being between 649 and 760°C (1200 and 1400°F).

Hot Working

The hot working capacity of UNS C48200 alloys is good.

Cold Working

The cold working capacity of UNS C48200 alloys is poor.

Annealing

The annealing temperature of UNS C48200 alloys is between and 427 and 593°C (800 and 1100°F).

Applications

UNS C48200 medium leaded brass-copper alloys are used in fasteners, hardware requiring corrosion resistant service, and marine applications. It is also used for high strength cold headed products.

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