Brass-Copper Alloy UNS C44400

Topics Covered

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

Introduction

Copper has the ability to be formed into alloys more freely than most metals. It can also be combined with a broad range of alloying elements. There are 400 types of copper alloys with each consisting of a variety of properties that are suitable for many applications, manufacturing processes, and environments.

UNS C44400 alloys are a type of brass-copper alloys, and are also known as admiralty and antimonial alloys. These alloys have good corrosion resistance and good cold workability for forming and bending. The following datasheet will provide details about UNS C44400 brass-copper alloys.

Chemical Composition

The following table shows the chemical composition of UNS C44400 brass-copper alloys.

Element Content (%)
Cu 71
Sn 1
Zn 28

Physical Properties

The physical properties of UNS C44400 brass-copper alloys are outlined in the following table.

Properties Metric Imperial
Density 8.53 g/cm3 0.308 lb/in³

Mechanical Properties

The mechanical properties UNS C44400 brass-copper alloys are tabulated below.

Properties Metric Imperial
Tensile strength 331-379 MPa 48000-55000 psi
Yield strength (depending on temper) 124-152 MPa 18000-22000 psi
Elongation at break (in 0 mm) 65% 65%
Creep strength (@425°C, time 3.60e+6 sec/797°F, time 1000 hr, 0.0001) 0.370 MPa 53.7 psi
Elastic modulus 117 GPa 17000 ksi
Poisson’s ratio 0.34 0.34
Charpy impact 82.4 J 60.8 ft lb
Fatigue strength (@# of cycles 1.00e+7, @# of cycles 1.00e+7, source does not state temper) 115-125 MPa 16700-18100 psi
Machinability (UNS C36000 (free cutting brass) = 100) 30 30
Shear modulus 40.0 GPa 5800 ksi

Thermal Properties

The thermal properties UNS C44400 brass-copper alloys are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (@20-300°C/68-572°F) 20.2 µm/m°C 11.2 µin/in°F
Thermal conductivity (@20°C/68°F) 110 W/mK 763 BTU in/hr.ft².°F

Other Designations

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Equivalent materials to UNS C44400 brass-copper alloys are:

  • ASME SB111
  • ASME SB171
  • ASME SB359
  • ASME SB395
  • ASME SB543
  • ASTM B111
  • ASTM B171
  • ASTM B359
  • ASTM B395
  • ASTM B432
  • ASTM B543

Fabrication and Heat Treatment

Machinability

The machinability rate of UNS C44400 brass-copper alloys are 30.

Welding

Soldering, brazing, oxyacetylene welding, butt welding, spot welding, and gas shielded arc welding are considered as suitable welding processes, whereas processes such as coated metal arc welding and seam welding are not recommended for the UNS C44400 alloys.

Hot Working

The hot working capacity of UNS C44400 is rated as fair with the suitable hot working temperature being between 649 and 788°C (1200 and 1450°F).

Cold Working

UNS C44400 alloys have excellent cold working capacity.

Annealing

The annealing temperature of UNS C44400 alloys is between and 427 and 593°C (800 and 1100°F).

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