C48200 Naval Brass is a medium-leaded brass alloy with a unique combination of high strength, excellent corrosion resistance, and good casting and machining properties, making it ideal for applications in the naval and marine industries, including propellers, valve components, and various fittings.
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When propellers face barnacle battles and valve stems endure brine warfare, C48200 Naval Brass steps up. This 'Medium Lead' alloy (1.5-2.5% Pb) combines zinc’s salt-spitting grit with lead’s buttery machinability. Trusted by the U.S. Navy since WWII, it’s the unsung hero keeping ships sailing and pumps pumping.
TECH SPECS: MARINE-GRADE MUSCLE
(Compliant with ASTM B21 / MIL-B-17159 / UNS C48200)
| Property | C48200 Naval Brass | 316 Stainless | C46400 Brass |
|---|---|---|---|
| Composition | 60% Cu, 39% Zn, 2% Pb | 16% Cr, 10% Ni | 60% Cu, 39% Zn, 1% Sn |
| Tensile Strength | 380–550 MPa | 515 MPa | 380 MPa |
| Corrosion Rate | 0.003 mm/year (seawater) | 0.001 mm/year | 0.008 mm/year |
| Machinability | 5 star (85% vs. free-cutting brass) | 2 star | 3 star |
| Thermal Conductivity | 110 W/m·K | 16 W/m·K | 75 W/m·K |
| Lead Content | 1.5–2.5% (RoHS exempt) | 0% | 0% |
Certifications: ASTM B21. RoHS Annex III Exemption 6b, REACH, DFARS Compliant
4 REASONS SHIPYARDS DEMAND C48200
Seawater Slayer
“Resists dezincification like armored plating – proven in Panama Canal lock components surviving 40+ years.”
Machining Nirvana
“Cuts like butter at 150+ SFM without gumming tools – 50% faster than lead-free brass for complex valve bodies.”
Cost-Smart Durability
“30% cheaper than nickel-aluminum bronze with comparable corrosion resistance in splash zones.”
Fatigue Fighter
“Handles 10⁸ vibration cycles in tugboat propeller shafts – won’t crack under torque abuse.”
HOW WE FORGE MARINE-TOUGH BRASS
1 Precision Alloying
"60/40 Cu-Zn base vacuum-melted with 2% Pb – ensures uniform lead dispersion for chip-breaking magic."
2 Hot Rolling
"Heated to 680°C, rolled to ±0.1mm tolerance – ideal for 5–100mm thick marine plate."
3 Stress Relieving
"Annealed at 425°C to banish seasonal cracking demons."
4 Surface Perfection
"Pickled and passivated to MIL-C-15726 standards – ready for saltwater combat."
WHERE IT ANCHORS PERFORMANCE
| Industry | Battle-Tested Applications | Why C48200? |
|---|---|---|
| Marine | Propeller shafts, stern tubes | Immune to dezincification (ISO 6509) |
| Oil & Gas | Pump impellers, valve trim | Handles H₂S sour service (NACE MR0175) |
| Power | Condenser tubes, heat exchanger plates | 110 W/m·K thermal conductivity |
| Industrial | Hydraulic fittings, marine fasteners | Self-lubricating for high-vibration zones |
| Heritage | Restoration of historic vessels | Matches 1940s-era naval alloys metallurgically |
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