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. Silicon brasses, including CW724R, belong to the high-strength brass subgroup. They are characterized by containing less than 20% zinc and less than 6% silicon. These brasses achieve their high strength through solid solution strengthening. They are commonly selected for applications requiring both high strength and reasonably high corrosion resistance, making them an ideal choice for underground service lines.

Chemical Composition

Elements
Min (%)
Max (%)
Cu
66.00
70.00
Pb
0.80
Fe
0.40
Ni
0.50
Si
0.70
1.30
Total Others
0.50
Zn
Remainder

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)
5.0
40.0
460
240
18
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°C
880-915
Density Kg/cm2. at 68°F
8.40
Specific Gravity
8.5
Electrical Conductivity% IACS at 68°F
15
Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F
71
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 good
Good
Gas welding
Good

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