C4641

Naval Brass comprises a copper-zinc alloy in a 60:40 proportion, enriched with around 1% tin to enhance its resistance against corrosion, particularly dezincification. This alloy adopts a dual-phase alpha-beta composition, resulting in a commendable strength profile albeit exhibiting lower ductility compared to the single-phase 70:30 or alpha brass. Its applications encompass structural contexts and forgings, especially in environments where exposure to seawater might induce corrosion. The mechanical characteristics bear a striking resemblance to those of 60:40 brass C4641, although the inclusion of tin generally imparts slightly elevated strength. CW619N can be effectively subjected to hot working and is also amenable to cold working, albeit not as seamlessly as the single-phase alpha brasses.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu59.0062.00
Pb0.50
Sn0.501.00
Fe0.20
ZnRemainder
MECHANICAL PROPERTIES ACCORDING TO EN 12165 (AS PER TEMPER H080)
Range (mm) From To UTS Min (MPa) PS Min Elongation Min (%) Hardness Min (HRB) Hardness Max (HRB)
Round (Dia)1.57537510
Hex (A/F)37037510
Square (A/F)36037510
Rectangle (Thickness)35037510
PHYSICAL PROPERTIES
Melting Points – Liquidus 0F1650
Melting Points – Solidus 0F1630
Density lb/cu in. at 68 0F0.304
Specific Gravity8.41
Electrical Conductivity % IACS at 68 0F26
Thermal conductivity Btu/ Sq ft / ft hr / 0F at 680F67
Coefficient of Thermal Expansion 68-57210 -6 Per 0F (68-5720F)11.8
Specific Heat capacity Btu/ lb /0F at 680F0.09
Modulus of Elasticity in Tension ksi15000
Modulus of Rigidity ksi5600
FABRICATION PROPERTIES
TechniqueSuitability
SolderingExcellent
BrazingExcellent
Oxyacetylene WeldingGood
Gas shielded Are WeldingFair
Coated Metal Are WeldingNot Recommended
Spot WeldGood
Seam WeldFair
Butt WeldGood
Capacity for Being Cold WorkedFair
Capacity for Being Hot FormedExcellent
Forgeability Rating90
Machinability Rating30

C4641

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