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C46200 Naval Brass is a high-strength, low-leaded copper-zinc alloy known for its excellent resistance to corrosion, particularly in marine environments, making it a popular choice for components such as propellers, valves, and fittings that require both durability and resistance to saltwater.
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When General Dynamics builds submarine valves or ExxonMobil outfits offshore rigs, they deploy C46200. This tin-enhanced brass laughs at salt spray, resists dezincification, and shrugs off 10-knot currents. It’s the reason USS Theodore Roosevelt’s cooling systems last 25+ years without failure – outperforming stainless steel in 80% of marine environments.
Technical Parameters
| Property | C46200 Value | C46400 (Naval Brass) | C48500 (High-Silicon Brass) |
|---|---|---|---|
| Composition | Cu 59–62% | Cu 60–63% | Cu 80%, Zn 16%, Si 4% |
| Zn 38–41%, Sn 0.7–1.1% | Sn 0.5–1.0% | ||
| Tensile Strength | 380 MPa | 400 MPa | 550 MPa |
| Dezincification Depth | <50 μm | <75 μm | <20 μm |
| Corrosion Rate (Seawater) | 0.025 mm/yr | 0.030 mm/yr | 0.015 mm/yr |
| Thermal Expansion | 21.2 μm/m·°C | 20.8 μm/m·°C | 18.1 μm/m·°C |
| Standard Forms | Rods, Forgings, Tubes | Sheets, Plates | Castings |
Certifications: ASTM B21. MIL-B-20080B, NACE MR0175. RoHS/REACH
3 Battle-Ready Advantages
Seawater Immunity
0.025mm/yr corrosion in salt spray (ASTM B117) – lasts 4x longer than bronze in tidal zones.
Impact Resistance
Absorbs 45 Joules impact energy (ASTM E23) – survives iceberg collisions in Arctic pipelines.
Machining Ease
70% machinability rating – cuts CNC time by 25% vs. Monel 400.
Mission-Critical Features
Biofouling Resistance: Tin content repels barnacles & algae (DNV-GL certified).
Stress-Corrosion Proof: Immune to SCC in chloride-rich environments (per NACE TM0177).
Thermal Conductivity: 105 W/m·K for rapid heat dissipation in condensers.
Non-Sparking: Safe for oil/gas hazardous areas (OSHA 1910.269 compliant).
Forging Excellence Process
1 Induction Melting
1.150°C controlled atmosphere to prevent tin oxidation.
2 Extrusion
Hot-pressed at 700°C for grain-aligned strength.
3 Solution Annealing
600°C quench to lock corrosion resistance.
4 Precision Machining
CNC-turned to ±0.01mm tolerance for valve seats.
5 Passivation
Chromate-free coating for saltwater activation.
Defense & Industrial Applications
| Industry | Components | Certification |
|---|---|---|
| Marine Engineering | Propeller shafts, stern tubes | ABS, DNV, Lloyd’s Register approval |
| Oil & Gas | Subsea valve bodies, wellhead parts | API 6A, NACE MR0103 |
| Power Generation | Condenser plates, turbine blades | ASME Section VIII Div. 1 |
| Defense | Torpedo tubes, deck hardware | MIL-STD-753. DFARS Compliant |
| Desalination | Heat exchanger tubes | WHO drinking water standards |
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