Beryllium Copper UNS C17000

Topics Covered

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

Introduction

UNS C17000 beryllium copper alloys are ductile, heat treatable and can be mill hardened. These alloys are used in applications, which require high strength and good conductivity. The following section will discuss in detail about UNS C17000 beryllium copper alloys.

Chemical Composition

The following table shows the chemical composition of UNS C17000 copper.

Element Content (%)
Cu 98.1
Be 1.7
Co 0.20

Physical Properties

The physical properties of UNS C17000 copper are given in the following table.

Properties Metric Imperial
Density 8.26 g/cm3 0.298 lb/in3
Melting point 866°C 1590°F

Mechanical Properties

The mechanical properties of UNS C17000 copper are tabulated below.

Properties Metric Imperial
Tensile strength, ultimate 483 - 810 MPa 70100 - 117000 psi
Tensile strength, yield (depending on temper) 221 - 1172 MPa 32100 - 170000 psi
Elongation at break (in 76.2 mm) 45.0% 45.0%
Modulus of elasticity 115 GPa 16700 ksi
Poissons ratio 0.300 0.300
Machinability (UNS C36000 (free-cutting brass) = 100%) 20% 20%
Shear modulus 50.0 GPa 7250 ksi

Other Designations

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Other designations that are equivalent to UNS C17000 copper include:

  • ASTM B194
  • ASTM B196
  • ASTM B570
  • SAE J461
  • SAE J463

Fabrication and Heat Treatment

Machinability

The machinability rating of C17000 copper alloys is 20%.

Welding

Welding methods such as soldering, brazing, gas shielded arc welding, coated metal arc welding, spot welding, seam welding and butt welding are preferred for C17000 copper alloys. Oxyacetylene welding is not recommended for this type of alloys.

Forging

C17000 copper alloys are forged at temperature ranging from 649 to 816°C (1200 to 1500°F).

Hot Working

C17000 copper alloys have good hot working property.

Cold Working

C17000 copper alloys have excellent cold working property.

Annealing

C17000 copper alloys are annealed at temperature ranging from 774 to 802°C (1425 to 1475°F).

Applications

The following are the major applications of the UNS C17000 copper:

  • Electrical/electronic connectors
  • Current-carrying springs
  • Precision screw machined parts
  • Welding electrodes
  • Bearings
  • Plastic molds
  • Corrosion resistant components

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