C69430

C69430, known as silicon red brass, is a preferred choice for underground service lines due to its exceptional corrosion resistance in various potable water conditions. This brass alloy possesses moderate strength and maintains excellent spring properties over time. It falls within the category of high-strength brasses. Silicon brasses like C69430 contain less than 20% zinc and less than 6% silicon. They are solid solution strengthened, making them a reliable option for applications that demand both high strength and reasonably high corrosion resistance.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu80.0083.00
Pb0.30
Fe0.20
Si3.504.50
Total Others0.50
ZnRemainder
MECHANICAL PROPERTIES ACCORDING TO ASTM B371 (AS PER TEMPER HO2)
Range (Inch) From To UTS Min (ksi) PS Min (ksi) Elongation Min (%) Hardness Min Hardness Max
Round (Dia)0.0591.000804015
1.0002.0007535 15
2.0002.953653515
Hex (A/F)0.1181.000804015
1.0002.000753515
2.0002.755653515
Square (A/F)0.1181.000804015
1.0002.000753515
2.0002.362653515
Range (mm) From To UTS Min (MPa) PS Min (MPa) Elongation Min (%) Hardness Min Hardness Max
Round (Dia)1.52555025015
255051524015
507545024015
Hex (A/F)32555025015
255051524015
507045024015
Square (A/F)3 2555025015
255051524015
506045024015
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 Rating 70

C69430

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