C65620 is a special high strength silicon bronze; the addional iron content provides added strength in conjunction with the self lubricity of the silicon for excellent bearing and load properties. C65620 / AMS 4616 is easily machined into ball bearing cage assemblies!
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C65620 Silicon Bronze: Marine-Grade Corrosion Champion
(UNS C65620 | ASTM B96 | SAE 80C)
Cu 94-96% · Si 2.5-3.5% · Mn ≤1.5% · Saltwater Survivor · Zero-Galling Workhorse
Product Overview: The Seawater Specialist
Trusted by naval architects and offshore engineers since 1938. C65620 silicon bronze delivers unmatched corrosion resistance in marine environments. With 40% higher saltwater endurance than tin bronzes and zero dezincification risk, it powers critical components from submarine valves to offshore rig fittings. Certified to ASTM B96, MIL-C-15345, and NACE MR0175, this alloy withstands 10+ knot seawater flow while maintaining structural integrity at depths exceeding 3.000 meters.
Technical Parameters
| Property | C65620 Value | Naval Brass | 316 Stainless |
|---|---|---|---|
| Composition | Cu 94-96% | Cu 60% | Fe 70% |
| Si 2.5-3.5% | Zn 39% | Cr 18% | |
| Tensile Strength | 510 MPa | 380 MPa | 580 MPa |
| Corrosion Rate (SW) | 0.001 mm/yr | 0.025 mm/yr | 0.002 mm/yr |
| Thermal Conductivity | 45 W/m·K | 120 W/m·K | 16 W/m·K |
| Fatigue Strength | 240 MPa | 150 MPa | 260 MPa |
| Max Service Temp | 260°C (500°F) | 200°C | 800°C |
Certifications: ASTM B96. ASME SB96. EN 1982. DNVGL-CP-0091
Top 4 Competitive Advantages
Seawater Immunity
50x slower corrosion than brass (per ASTM G48)
Weldability
Autogenous TIG welding without filler metals
Biofouling Resistance
80% less barnacle adhesion vs. copper alloys
Lifecycle Economy
25-year service in splash zones (vs. 8-10 yrs for bronze)
Critical Performance Features
Non-Sparking: ATEX/IECEx Zone 1 certified
Stress Corrosion Immunity: 0% failure in 10.000-hr NaCl tests
High Damping Capacity: Absorbs 4x more vibration than steel
Cryogenic Toughness: Maintains impact strength at -196°C
Non-Magnetic: Permeability <1.05 μ
Continuous Casting Process
1 Vacuum Melting
Oxygen-free Cu + 99.99% Si @ 1080°C under argon
2 Continuous Casting
Directional solidification → ultra-dense grain structure
3 Homogenization
750°C × 8hr → eliminate dendritic segregation
4 Cold Working
40% reduction → 510 MPa tensile strength
5 Quality Validation
100% eddy current testing + ASTM E8 tension tests
Core Applications
| Industry | Critical Components | Standards |
|---|---|---|
| Marine Engineering | Propeller shafts, seawater valves | ABS 3. Lloyds LR 2.4 |
| Offshore Oil/Gas | ROV components, subsea manifolds | NACE MR0175. API 6A |
| Chemical Processing | Acid transfer pumps, heat exchangers | ASME B31.3. EN 10222 |
| Architecture | Coastal bridge fasteners, sculptures | ASTM A153. ISO 9223 |
| Aerospace | Hydraulic fittings, fuel lines | AMS 4616. MIL-B-24480 |
Top Search Keywords:
C65620 marine bronze | Silicon bronze seawater valves | Non-sparking bronze fittings | ASTM B96 rods
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