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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
Elements | Min (%) | Max (%) |
Cu | 59.00 | 61.00 |
Pb | – | 0.20 |
Sn | 0.50 | 1.00 |
Fe | – | 0.10 |
Ni | – | 0.20 |
Total Others | – | 0.50 |
Zn | Remainder |
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 0F | 1650 |
Melting Points – Solidus 0F | 1630 |
Density lb/cu in. at 68 0F | 0.304 |
Specific Gravity | 8.41 |
Electrical Conductivity % IACS at 68 0F | 26 |
Thermal conductivity Btu/ Sq ft / ft hr / 0F at 680F | 67 |
Coefficient of Thermal Expansion 68-57210 -6 Per 0F (68-5720F) | 11.8 |
Specific Heat capacity Btu/ lb /0F at 680F | 0.09 |
Modulus of Elasticity in Tension ksi | 15000 |
Modulus of Rigidity ksi | 5600 |
FABRICATION PROPERTIES | |
Technique | Suitability |
Soldering | Excellent |
Brazing | Excellent |
Oxyacetylene Welding | Good |
Gas shielded Are Welding | Fair |
Coated Metal Are Welding | Not Recommended |
Spot Weld | Good |
Seam Weld | Fair |
Butt Weld | Good |
Capacity for Being Cold Worked | Fair |
Capacity for Being Hot Formed | Excellent |
Forgeability Rating | 90 |
Machinability Rating | 30 |