CW724R

CW724R, a type of silicon red brass, is specifically chosen for use in underground service lines due to its exceptional corrosion resistance when exposed to various potable waters. This alloy also possesses moderate strength and retains good spring properties over time.

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
ElementsMin (%)Max (%)
Cu75.0077.00
Pb0.10
Fe0.30
Sn0.30
Ni0.20
Mn0.05
Al0.05
P0.020.10
Si2.703.50
Total Others0.15
ZnRemainder
MECHANICAL PROPERTIES ACCORDING TO CW724R EN12164 (AS PER TEMPER R500)
Range (mm) From To UTS Min (MPa) PS Min (MPa) Elongation Min (%) Hardness Min Hardness Max
Round (Dia)357550045015
Hex (A/F)357050045015
Square (A/F)356050045015
Rectangle (Thickness)355050045015
PHYSICAL PROPERTIES
Melting Point – Liquidus°F1685
Melting Point – Solidus°F1510
Density lb/cu in. at 68°F0.26
Specific Gravity8.19
Electrical Conductivity % IACS at 68°F6.2
Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F15
Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F)11.2
Specific Heat Capacity Btu/ lb /°F at 68°F0.09
Modulus of Elasticity in Tension ksi16000
FABRICATION PROPERTIES
TechniqueSuitability
SolderingExcellent
BrazingExcellent
Oxyacetylene WeldingGood
Spot WeldGood
Seam WeldGood
Butt WeldGood
Capacity for Being Cold WorkedGood
Capacity for Being Hot FormedExcellent
Forgeability Rating80
Machinability Rating80

CW724R

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