C48500 Naval Brass, also known as Muntz Metal, is a low-leaded copper-zinc alloy with enhanced corrosion resistance and strength, widely used in marine environments for propellers, condenser tubes, and other components due to its excellent resistance to saltwater corrosion and good mechanical properties.
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When Shell engineers needed valves for Arctic LNG carriers or Newport News Shipbuilding designed submarine condenser tubes, they chose C48500. This silicon-bronze hybrid laughs off 30.000 PSI pressures, shrugs at sand abrasion in seawater pumps, and laughs in the face of dezincification. It’s why Chevron’s Gulf of Mexico platforms use it for critical choke valves – outperforming standard naval brass by 15+ years in salt spray torture tests.
Technical Parameters
| Property | C48500 Value | C46400 (Naval Brass) | Aluminum Bronze C95400 |
|---|---|---|---|
| Composition | Cu 79–82% | Cu 60–63% | Cu 85%, Al 11% |
| Zn 14–17%, Si 3–4.5% | Zn 37%, Sn 0.7–1% | Fe 4% | |
| Tensile Strength | 550 MPa | 400 MPa | 620 MPa |
| Dezincification Depth | <20 μm | <75 μm | Immune |
| Corrosion Rate (Seawater) | 0.015 mm/yr | 0.030 mm/yr | 0.010 mm/yr |
| Max Working Pressure | 30.000 PSI | 12.000 PSI | 45.000 PSI |
| Hardness (Brinell) | 170 HB | 110 HB | 210 HB |
Certifications: ASTM B122. NACE MR0175. ABS Type 4. DNV-GL OS-C101
3 Unbeatable Advantages
Cavitation Erosion Shield
Withstands 40 m/s slurry flows (ASTM G32) – 10x longer lifespan than C46400 in pump impellers.
Gall-Resistant Sealing
0.001mm wear after 10k cycles (ASTM D3702) – eliminates valve stem leaks in subsea Christmas trees.
Total Cost Champion
30% cheaper than Monel K500 – saves $280k per offshore wellhead system.
Mission-Critical Features
Biofouling Immunity: Silicon oxide layer repels mussels/barnacles (DNV-RP-B401 certified).
Thermal Shock Resistance: Handles -196°C cryo to 400°C steam without cracking.
Non-Sparking: Safe for Class I Div 1 hazardous zones (OSHA 1910.269 compliant).
Welding Simplicity: No preheat required with ERCuSi-A filler.
Military-Grade Production
1 Vacuum Induction Melting
1.200°C under argon shield to prevent silicon loss.
2 Centrifugal Casting
Grain-refined microstructure for isotropic strength.
3 Hot Isostatic Pressing (HIP)
1.000°C @ 15.000 PSI to eliminate porosity.
4 CNC Machining
Hard-turning with PVD-coated carbide @ 120 m/min.
5 Electrochemical Passivation
Chromate-free cerium coating for instant seawater passivation.
Extreme Environment Applications
| Industry | Components | Certification |
|---|---|---|
| Subsea Oil & Gas | X-mas tree valves, choke bodies | API 6A/17D, NORSOK M-650 |
| Naval Defense | Submarine ballast valves, torpedo tubes | MIL-DTL-22214. DFARS Compliant |
| Power Generation | Geothermal brine heat exchangers | ASME Boiler & Pressure Vessel Code |
| Desalination | High-pressure RO membranes | ISO 24817 for erosion-corrosion |
| Cryogenic | LNG loading arms, cryo valves | BS EN 14620 (Design for -196°C) |
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