Copper Alloy (UNS C99700)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication
     Machinability
     Welding
     Heat Treatment

Introduction

Brass is an alloy mainly consisting of copper and zinc. Brass alloys can be easily shaped and are available in various colors. They are used in several applications such as bearings, gears, doorknobs, locks, ammunition casings and valves as well as for plumbing and electrical applications.

The following datasheet gives an overview of UNS C99700 copper alloy.

Chemical Composition

The following table shows the chemical composition of UNS C99700 copper alloy.

Element Content (%)
Copper, Cu ≥ 54
Zinc, Zn 19 - 25
Manganese, Mn 11 - 15
Nickel, Ni 4 - 6
Lead, Pb ≤ 2
Tin, Sn ≤ 1
Iron, Fe ≤ 1
Aluminum, Al 0.50 - 3

Physical Properties

The physical properties of UNS C99700 copper alloy are tabulated below.

Properties Metric Imperial
Density 8.19 g/cm3 0.296 lb/in3

Mechanical Properties

The mechanical properties of UNS C99700 copper alloy are outlined in the following table.

Properties Metric Imperial
Hardness, Brinell (3000 kg, sand cast) 110 110
Hardness, Brinell (3000 kg, die cast) 125 125
Tensile strength ( sand cast) 380 MPa 55100 psi
Tensile strength (die cast) 450 MPa 65300 psi
Yield strength (@ 0.5%, sand cast) 170 MPa 24700 psi
Yield strength (@ 0.5%, die cast) 185 MPa 26800 psi
Poisson's ratio 0.34 0.34
Modulus of elasticity 1147 GPa 17000 ksi
Elongation at break (in 50 mm, die cast) 15% 15%
Elongation at break (in 50 mm, sand cast) 25% 25%
Machinability (UNS C36000 (free-cutting brass) = 100) 80 80

Other Designations

Other designations that are equivalent to UNS C99700 copper alloy include:

  • ASTM B176
  • ASTM B30

Fabrication

Machinability

The machinability rate of UNS C99700 copper alloy is 80.

Welding

UNS C99700 copper alloy can be welded using brazing, soldering, and oxyacetylene welding processes.

Heat Treatment

UNS C99700 copper alloy can be stress relieved at a temperature of about 370°C (700°F). The time taken for stress relieving is about 1 h/in. of section thickness. They do not respond to heat treatment.

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