C464 brass, very often referred to as Naval Brass, is a lead-free alternative to C485 brass. It contains 60% copper, 39.2% zinc, and 0.7% tin. Its level of zinc makes it a duplex brass containing both alpha and beta phases, so it’s both hard and tough.
Because of its small quantity of tin, C464 Naval Brass helps resist dezincification that causes brass to become weak and porous, making it a good choice for applications with exposure to mild acids and alkalis. C464 also has excellent resistance to both freshwater and saltwater.
C464 can be cold worked to raise hardness, and can also be hot worked, brazed, and soldered. Machinability is poor as it yields long chips and generates built-up-edge on the cutting tool, so smaller depths of cut and lower cutting speeds are recommended.
C464 is used in many marine applications, both for mechanical components like propeller shafts, and for fasteners and decorative hardware. Other uses are in pumps, valves, and other parts of water handling systems, as well as condenser tubes used with steam.
Source One Metals carries C464 in rod, sheet, and plate form.
| Property | Value | Notes |
|---|---|---|
| Material Type | Copper-zinc alloy | UNS C46400 |
| Composition | 60% Cu, 39.2% Zn, 0.7% Sn | |
| Density | 8.41 g/cm3 | 0.304 lb/in3 |
| Melting Point | ~ 888-899°C | ~ 1,630-1,650°F |
| Hardness (Brinell) | ~ 89-135 | Depends on temper |
| Tensile Strength | ~ 379-607 MPa | ~ 55,000-88,000 psi |
| Yield Strength | ~ 172-455 MPa | ~ 24,900-66,000 psi |
| Elongation at Break | ~ 20-50 % | Depends on temper |
| Modulus of Elasticity | ~ 117 GPa | ~ 17.0 x106 psi |
| Electrical Conductivity | 26% IACS at 68°F | |
| Thermal conductivity | 116 W/mK | 805 Btu in./hr.ft.² ° F at 68°F |
| Corrosion Resistance | Excellent resistance to sea and freshwater | Poor resistance to most acids and alkalis |
| Magnetism | No | |
| Heat Treatment | Harden through cold working, anneal to soften | |
| Machinability | Poor | Long chips |
| Weldability | Solders and brazes well; spot, oxyacetylene, and gas shielded arc welding are possible | Coated metal arc welding not recommended |
| DFARS Compliance | No | Not qualified as a specialty steel under DFARS |
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