CW708R

This high copper alloy exhibits outstanding mechanical properties and exceptional wear resistance, even when exposed to elevated temperatures. However, its decreased workability, particularly during chip removal processes, limits its applications to the production of items such as bearings, bushings, and mechanical components that endure heavy loads.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu66.0070.00
Pb0.80
Fe0.40
Ni0.50
 0.701.30
Total Others0.50
ZnRemainder
MECHANICAL PROPERTIES ACCORDING TO EN12163 CUZN31SI1 CW708R (AS PER TEMPER R460)
Range (Inch) From To UTS Min N/mm2 PS Min (ksi) Elongation Min (%) Hardness Min (HRB) Hardness Max(HRB)
Round (Dia)5.040.046024018
Hex (A/F) 5.0 40.0 460 240 18
Square (A/F) 5.0 40.0 460 240 18
Octagon (A/F) 5.0 40.0 460 240 18
PHYSICAL PROPERTIES
Melting Point – Liquidus°C880-915
Density Kg/cm2. at 68°F8.40
Specific Gravity8.5
Electrical Conductivity% IACS at 68°F15
Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F71
Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F)19.4
Specific Heat Capacity J/ (Kg K)377
Modulus of Elasticity in GPa 108
FABRICATION PROPERTIES
Machinability 40%
Capacity of being cold worked good
Capacity of being hot worked Fair
Resistance welding Good
Arc welding goodGood
Gas weldingGood

CW708R

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