C69430 Silicon Red Brass
C69430 silicon brass, also known as complex brass, is a high performance copper alloy material. Its unique composition and processing process allow it to show outstanding performance in many applications.
Volume: 0
C69430 silicon brass, also known as complex brass, is a high performance copper alloy material. Its unique composition and processing process allow it to show outstanding performance in many applications.
Volume: 0
When Victaulic designs fire sprinkler systems or Viking Yachts builds seawater pump housings, they swear by C69430. This lead-free marvel (86% Cu, 4% Zn, 10% Si) laughs off saltwater corrosion while delivering silicon bronze strength at brass prices. It’s the hidden backbone of NYC water tunnels and BP offshore rigs – where failure isn’t an option.
Technical Parameters
| Property | C69430 Value | C83600 (Leaded Red Brass) | C87300 (Silicon Bronze) |
|---|---|---|---|
| Composition | Cu 86%, Si 10% | Cu 85%, Zn 5%, Pb 5% | Cu 96%, Si 4% |
| Zn 4%, Pb≤0.09% | Sn 5% | ||
| Tensile Strength | 520 MPa | 275 MPa | 480 MPa |
| Dezincification Rating | RDA Class 1 | Class 3 | Class 1 |
| Machinability | 70% | 90% | 40% |
| Pressure Rating | 2.500 PSI | 1.200 PSI | 3.000 PSI |
| Thermal Conductivity | 45 W/m·K | 75 W/m·K | 39 W/m·K |
Certifications: NSF/ANSI 61. ASTM B584. RoHS/REACH Compliant, ASME B31.1
3 Dominant Advantages
Saltwater Immunity
Survives 20+ years in seawater (per ASTM G48) – dezincification resistance 5x better than C83600.
High-Pressure Hero
Holds 2.500 PSI at 150°C – certified for BP’s subsea valves at 3.000m depth.
Eco-Compliance
0.09% lead meets EU RoHS/US Safe Water Act – the reason NYC uses it in 90% of new water mains.
Critical Features
Zero Galvanic Corrosion: Electrochemical stability with stainless steel (critical for marine fittings).
Castability: Fills 0.5mm thin sections with no hot tears (Ideal for ornate architectural castings).
Biofouling Resistance: 80% less barnacle adhesion vs. bronze (tested at Scripps Institute).
Weldability: Gas-tight TIG welds without preheat (per AWS D18.1).
Production Process
1 Induction Melting
1.150°C under argon shield to control silicon oxidation.
2 Centrifugal Casting
Spin-cast in resin-bonded sand molds (±0.2mm tolerance).
3 Solution Annealing
750°C water quench for optimal silicon dispersion.
4 Precision Machining
Carbide tools at 120 m/min (continuous chips require chip breakers).
5 Passivation
Nitric acid dip for maximum corrosion resistance.
Core Applications
| Industry | Components | Validation |
|---|---|---|
| Marine | Seawater pump housings, prop shafts | 15-year warranty on Viking Yachts |
| Fire Protection | Sprinkler heads, valve bodies | Victaulic GrooveLock System certified |
| Water Infrastructure | Water main fittings, valve stems | 50M+ units in NYC water tunnels |
| Energy | Offshore rig flange gaskets | BP North Sea project approved |
| Architecture | Marine-grade hardware | Golden Gate Bridge restoration contract |
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