Medium Leaded Brass UNS C34000

Topics Covered

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

Introduction

UNS C34000 medium leaded brass is alloy of copper, zinc and lead. It has good corrosion resistance and formability. It is produced by the processes such as blanking, heading, upsetting, machining, piercing, punching, roll threading, knurling and stamping.

The following section will discuss in detail about the UNS C34000 medium leaded brass alloy.

Chemical Composition

The following table shows the chemical composition of UNS C34000 brass alloys.

Element Content (%)
Cu 62.5 - 66.5
Fe  0.10
Pb 0.80-1.40
Zn 34
Other  0.50

Physical Properties

The physical properties of UNS C34000 brass alloys are given in the following table.

Properties Metric Imperial
Density 8.47 g/cm3 0.306 lb/in³
Melting point 888°C 1630°F

Mechanical Properties

The mechanical properties of UNS C34000 brass alloys are tabulated below.

Properties Conditions
T (°C) Treatment
Poisson's ratio 0.34 25 -
Elastic modulus 117 GPa 25 -
Tensile strength 324-607 MPa - -
Yield strength 103-414 MPa 25 (flat products, wire)
Elongation 60% - -

Thermal Properties

The thermal properties of UNS C34000 brass alloys are tabulated below.

Properties Metric Imperial
Thermal expansion coefficient (@20-300°C/68-572°F) 20.3 µm/m°C 11.3 µin/in°F
Thermal conductivity (@20°C/68°F) 115 W/mK 798 BTU in/hr.ft².°F

Other Designations

Other designations that are equivalent to UNS C34000 brass alloys include:

  • ASTM B121
  • ASTM B453

Fabrication and Heat Treatment

Machinability

The machinability rating of C34000 brass alloys is 70.

Welding

Welding methods such as soldering, brazing and butt welding are preferred for C34000 brass alloys. Oxyacetylene welding, gas shielded arc welding, coated metal arc welding, seam welding and spot welding are not preferred for this type of alloys.

Hot Working

C34000 brass alloys have good poor working property.

Cold Working

C34000 brass alloys have good cold working property.

Annealing

Annealing of C34000 brass alloys is performed at temperatures ranging from 427 to 649°C (800 to 1200°F).

Applications

The following are the major applications of UNS C34000 brass alloys:

  • Hose fittings
  • Watch
  • Clock and lock parts
  • Bicycle spoke nipples
  • Plumbing valve components

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