When complex valve bodies demand buttery-smooth machining or seawater threatens bearing surfaces, C66100 Leaded Silicon Bronze delivers. This copper-tin-silicon alloy (95.5% Cu, 3% Si, 1.5% Pb) cuts like butter while laughing off salt spray. RoHS-exempt per Annex III 6c – it’s the go-to for corrosion-resistant, high-precision components.
TECH SPECS: ENGINEERED FOR PRECISION
(ASTM B98 / UNS C66100 / RoHS Annex III Exempt)
| Property | C66100 Bronze | C65500 (High-Si) | C93200 (SAE 660) |
|---|
| Composition | 95.5% Cu, 3% Si, 1.5% Pb | 97% Cu, 3% Si | 83% Cu, 7% Sn, 7% Pb |
| Tensile Strength | 380 MPa | 550 MPa | 330 MPa |
| Machinability | 5 star (85% vs. free-cutting brass) | 65% | 80% |
| Corrosion Resistance | 5 star (Seawater) | 5 star | 3 star |
| Thermal Conductivity | 45 W/m·K | 42 W/m·K | 50 W/m·K |
| Lead Content | 1.5% (RoHS Exempt) | <0.1% | 7% |
Certifications: ASTM B98. ASME SB98. RoHS Annex III Exemption 6c, DFARS
5 REASONS FACTORIES CHOOSE C66100
Effortless Machining
“Cuts at 300 SFM with HSS tools – produces silver-like chips without built-up edge. Saves 35% CNC time vs. nickel alloys.”
Marine-Grade Toughness
“Survives 15+ years in tidal zones – dezincification-proof for boat bushings and pump impellers.”
Bearing Brilliance
“Embedded lead pockets reduce friction (μ=0.08) – ideal for stern tube bearings without external lube.”
Thermal Stability
“Holds ±0.01mm tolerances from -40°C to 200°C – perfect for cryogenic valve seats.”
Cost Efficiency
“30% cheaper than monel for seawater systems – RoHS-exempt with full compliance docs.”
KEY FEATURES: BEYOND THE ALLOY
Vibration Damping: Lead particles absorb harmonics in high-RPM machinery
Weldability: TIG welds without preheat – minimal HAZ cracking
Non-Sparking: Safe for oil/gas valve components (MSHA approved)
Chip Control: Breaks chips into C-shaped curls – no bird-nesting in CNC lathes
PRECISION PROCESSING: FROM INGOT TO FINISH
1 Controlled Alloying
"Vacuum-degassed Cu-Si melt with 1.5% Pb addition – eliminates porosity for uniform lead distribution."
2 Extrusion & Drawing
"Hot-extruded at 700°C into rods, then cold-drawn to H02 temper (Rockwell B 75)."
3 Stress Relieving
"Annealed at 425°C to stabilize dimensions for tight-tolerance machining."
4 Quality Assurance
"Eddy-current tested for defects; hardness-mapped per ASTM E10."
WHERE IT EXCELS: CRITICAL APPLICATIONS
| Industry | Key Components | Why C66100? |
|---|
| Marine | Propeller shafts, rudder bearings | Immune to saltwater pitting & cavitation |
| Oil & Gas | Valve stems, wellhead seals | Non-sparking, H₂S-resistant |
| HVAC | Pump impellers, compressor rings | Handles glycol mixtures without corrosion |
| Industrial | Gears, bushings, hydraulic flanges | Self-lubricating under heavy loads |
| Art & Architecture | Sculpture armatures, restoration fasteners | Patinas evenly, no stress cracks |
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