CW717R

CW717R is a naval brass alloy known for its high ductility, excellent electrical and thermal conductivity, strong impact resistance, good creep resistance, and ease of welding. It also has low volatility under high vacuum.

Chemical Composition

• Copper (Cu): 59.00 – 62.00%

• Tin (Sn): 0.50 – 1.00%

• Arsenic (As): 0.02 – 0.06%

• Lead (Pb): Up to 0.20%

• Iron (Fe): Up to 0.10%

• Nickel (Ni): Up to 0.20%

• Zinc (Zn): Balance

• Total others: Up to 0.20%

Mechanical Properties (As per temper R320)

• Tensile Strength (UTS): Minimum 320 MPa

• Proof Stress (PS): Minimum 100 MPa

• Elongation: Minimum 30%

• Hardness: Varies depending on shape and form

Physical Properties

• Melting Point: Solidus ~1630°F, Liquidus ~1650°F

• Density: 8.41 g/cm³ (0.304 lb/cu in at 68°F)

• Electrical Conductivity: 26% IACS at 68°F

• Thermal Conductivity: 67 BTU/(ft²·hr·°F)

• Coefficient of Thermal Expansion: 11.8 × 10⁻⁶ per °F

• Modulus of Elasticity: 15000 ksi

• Modulus of Rigidity: 5600 ksi

Fabrication Properties

• Excellent soldering and brazing

• Good oxyacetylene welding

• Fair gas shielded arc welding

• Not recommended for coated metal arc welding

• Good spot and butt welding

• Fair cold workability and excellent hot workability

• Forgeability rating: 90

• Machinability rating: 30 (relative scale)

Applications

• Marine hardware

• Structural components exposed to seawater

• Valves and pump parts

• Heat exchangers and condensers