Beryllium Copper UNS C17200

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 C17200 beryllium copper alloys are ductile and produced in mill hardened and heat treatable tempers. These alloys are used for all applications, which require high strength, stiffness and good conductivity. The tensile strength of C17200 copper is over 1380 MPa (200 ksi).

The following datasheet will explain about UNS C17200 beryllium copper alloys.

Chemical Composition

The following table shows the chemical composition of UNS C17200 copper.

Element Content (%)
Cu 97.9
Be 1.9
Co 0.20

Physical Properties

The physical properties of UNS C17200 copper are given in the following table.

Properties Metric Imperial
Density (during age hardening, 2% max. decrease in length and 6% max. increase in density) 8.25 g/cm3 0.298 lb/in3
Melting point 866°C 1590°F

Mechanical Properties

The mechanical properties of UNS C17200 copper are tabulated below.

Properties Metric Imperial
Hardness, Rockwell B 80.0 - 85.0 80.0 - 85.0
Tensile strength, ultimate 1280 - 1480 MPa 186000 - 215000 psi
Tensile strength, yield 965 - 1205 MPa 140000 - 174800 psi
Elongation at break 15.0 - 30.0% 15.0 - 30.0%
Modulus of elasticity 125 - 130 GPa 18100 - 18900 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

Other designations that are equivalent to UNS C17200 copper include:

  • AMS 4651
  • AMS 4725
  • ASTM B194
  • ASTM B196
  • ASTM B197
  • ASTM B570
  • MIL C-21657
  • SAE J461
  • SAE J463

Fabrication and Heat Treatment

Machinability

The machinability rate of C17200 copper alloys is 20%.

Welding

Welding procedures such as butt welding, seam welding, spot welding, coated metal arc welding, gas shielded arc welding, brazing and soldering are recommended for C17200 copper alloys. For this type of alloys, oxyacetylene welding is not recommended.

Forging

Forging of C17200 copper alloys is carried out at temperature ranging from 649 to 816°C (1200 to 1500°F).

Hot Working

C17200 copper alloys have good hot working property.

Cold Working

C17200 copper alloys have excellent cold working property.

Annealing

C17200 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 C17200 copper:

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

Comments

  1. Tom Chandler Tom Chandler United States says:

    Someone goofed here! The hardness, and tensile strength for C17200 as presented  here are GROSSLY understated, actually incorrect, by at least a factor of X2 for UTS UTS for TH04 tempered rod is closer to 200 KSI with hardness at Rockwell C of 40 - 42.

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of AZoM.com.

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