CW719N

Naval Brass, a copper-zinc alloy in a 60:40 ratio, incorporates approximately 1% tin to enhance its corrosion resistance, especially against dezincification. This alloy adopts a dual-phase alpha-beta structure, imparting a notable strength profile albeit with diminished ductility in comparison to the single-phase 70:30 or alpha brass. Its utilization finds a stronghold in structural applications and forgings, particularly in environments where exposure to seawater may induce corrosion. The mechanical attributes closely resemble those of 60:40 brass C28000, with the tin addition contributing to slightly elevated strength. CW719N displays favorable responsiveness to hot working and can also be subjected to cold working, although not with the same ease as the single-phase alpha brasses.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu59.0061.00
Pb0.20
Sn0.501.00
Fe0.10
Ni0.20
Total Others0.50
ZnRemainder
MECHANICAL PROPERTIES ACCORDING TO EN 12165 (AS PER TEMPER H080)
Range (mm) From To UTS Min PS Min Elongation Min (%) Hardness Min (HRB) Hardness Max (HRB)
Round (Dia) 8 75 80 150
Hex (A/F) 8 70 80 150
Square (A/F) 8 60 80 150
Rectangle (Thickness) 8 50 80 150
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

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