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CW717R
CW717R
CW717R (metallurgical designation CuZn38Sn1As) is a specialized high-performance brass alloy defined under European standards EN 12164 (rods for free machining), EN 12165 (forging stock), and EN 12167 (profiles and rectangular bars). Engineered for severe fluid-handling conditions, it combines the marine seawater durability of Naval Brass with the anti-dezincification protection of DZR Brass. By pairing approximately 1% Tin (Sn) with a controlled micro-addition of Arsenic (0.02% - 0.15% As) in a duplex (Α + Β) matrix, CW717R creates a dual-layer defense against selective zinc leaching in both saline marine environments and aggressive, chlorinated hot-water systems.
Chemical Composition
Elements | Min (%) | Max (%) |
Cu | 59.00 | 62.00 |
Pb | – | 0.20 |
Sn | 0.5 | 1.00 |
Fe | – | 0.10 |
Ni | – | 0.20 |
As | 0.02 | 0.06 |
Total Others | – | 0.20 |
Zn | Remainder | |
Mechanical Properties According To EN 1653 (As Per Temper R320)
Range (mm) |
From |
To |
UTS Min (MPa) |
PS Min (MPa) |
Elongation Min (%) |
Hardness Min |
Hardness Max |
| Round (Dia) | 1.5 | 75 | 320 | 100 | 30 | – | – |
| Hex (A/F) | 3 | 70 | 320 | 100 | 30 | – | – |
| Square (A/F) | 3 | 60 | 320 | 100 | 30 | – | – |
| Rectangle (Thickness) | 3 | 50 | 320 | 100 | 30 | – | – |
PHYSICAL PROPERTIES |
|
| Melting Point – Liquidus°F | 1650 |
| Melting Point – Solidus°F | 1630 |
| Densitylb/cu in. at 68°F | 0.304 |
| Specific Gravity | 8.41 |
| Electrical Conductivity% IACS at 68°F | 26 |
| Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F | 67 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11.8 |
| Specific Heat CapacityBtu/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tensionksi | 15000 |
| Modulus of Rigidityksi | 5600 |
FABRICATION PROPERTIES |
|
| Technique | Suitability |
| Soldering | Excellent |
| Brazing | Excellent |
| Oxyacetylene Welding | Good |
| Gas Shielded Arc Welding | Fair |
| Coated Metal Arc 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 |
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