Brass – Copper Alloy UNS C46400

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 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 many properties that are suitable for various applications, manufacturing processes, and environments.

UNS C46400 alloys are a type of brass-copper alloys. It is also known as naval brass. These alloys have good corrosion resistance, hot workability, and hot forgeability. The following datasheet will provide details about UNS C44400 brass-copper alloys.

Chemical Composition

The following table shows the chemical composition of UNS C46400 brass-copper alloys.

Element Content (%)
Cu 60
Sn 0.75
Zn 39.25

Physical Properties

The physical properties of UNS C46400 brass-copper alloys are outlined in the following table.

Properties Metric Imperial
Density 8.41 g/cc 0.304 lb/in³
Melting point 888°C 1630°F

Mechanical Properties

The mechanical properties UNS C46400 brass-copper alloys are tabulated below.

Properties Metric Imperial
Tensile strength 379-607 MPa 55000-88000 psi
Yield strength (depending on temper) 172-455 MPa 24900-66000 psi
Elongation at break (in 431.8 mm) 50% 50%
Elastic modulus 117 GPa 17000 ksi
Poisson’s ratio 0.34 0.34
Machinability (UNS C36000 (free-cutting brass) = 100) 30 30
Shear modulus 39.0 GPa 5660 ksi

Thermal Properties

The thermal properties UNS C46400 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 (@20°C/68°F) 116 W/mK 805 BTU in/hr.ft².°F

Other Designations

Equivalent materials to UNS C46400 brass-copper alloys are:

  • ASME SB171
  • ASTM B124
  • ASTM B171
  • ASTM B21
  • ASTM B283
  • ASTM B432
  • ASTM F467
  • ASTM F468
  • MIL W-6712
  • QQ B639
  • SAE J461
  • SAE J463

Fabrication and Heat Treatment

Machinability

The machinability rate of UNS C46400 brass-copper alloys are 30.

Welding

Soldering, brazing, oxyacetylene welding, gas shielded arc welding, spot welding, seam welding, and butt welding are considered as suitable welding processes, whereas coated metal arc welding is not recommended for UNS C46400 alloys.

Forging

The hot forgeability rating of UNS C46400 is 90 with the preferred hot working temperature being between 649 and 816°C (1200 and 1500°F).

Hot Working

The hot working capacity of UNS C46400 alloys is rated as excellent.

Cold Working

The UNS C46400 alloys have fair cold working capacity.

Annealing

The annealing temperature of the UNS C46400 alloys is between and 427 and 593°C (800 and 1100°F).

Applications

The UNS C46400 brass-copper alloys are mainly used for fasteners, hardware that requires corrosion resistant service, and marine applications. They are also used for high strength cold headed products.

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