C16200 Cadmium Copper alloy offers a unique combination of high tensile strength and high electrical conductivity for an industry where these properties are generally considered incompatible. The nominal composition of 99.0% copper and 1.0% cadmium can lead to these unique properties.
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When Formula 1 teams need wiring that survives 200°C engine bays, or power grids demand crack-proof transmission hardware, C16200 delivers. This alloy fuses 99% copper with 0.7-1.2% cadmium – hitting 90% IACS conductivity while doubling pure copper’s strength. It’s the hidden backbone of NYC’s subway third rails and SpaceX’s rocket ignition systems.
Key Parameters
| Property | C16200 Value | Pure Copper (C11000) |
|---|---|---|
| Composition | Cu 98.8%, Cd 1.0% | Cu 99.9% |
| Tensile Strength | 380 MPa | 210 MPa |
| Electrical Conductivity | 90% IACS | 100% IACS |
| Thermal Conductivity | 350 W/m·K | 391 W/m·K |
| Annealed Hardness | 55 HRB | 40 HRB |
| Max Service Temp | 250°C | 150°C |
| Machinability | 60% | 20% |
Standards Compliance: ASTM B301. SAE J461. RoHS Exemption 6c, ISO 5182
3 Unbeatable Advantages
Strength + Conductivity Combo
380 MPa strength with 90% IACS – carries 20% more current than pure copper in identical busbars.
Heat & Wear Resistance
Maintains hardness at 250°C – outlasts C11000 by 5x in welding electrode holders.
Corrosion Defense
Survives 1.000+ hrs salt spray (ASTM B117) – critical for coastal power substations.
Critical Features
Work-Hardenable: Gains 120% hardness after cold working (ideal for stamped contacts)
Non-Sparking: ATEX/IECEx certified for explosive environments
Solderable & Brazeable: Seamless bonding to steel/brass components
Fatigue Resistance: Withstands 50M+ flex cycles in robotic cable carriers
Production Process
1 Controlled Atmosphere Melting
Argon-shielded induction furnaces prevent Cd oxidation.
2 Horizontal Continuous Casting
Near-net-shape billets cast with <0.01% porosity.
3 Cold Working
Reduction up to 80% via rolling/drawing to boost strength.
4 Stress Relief Annealing
400°C/60 mins treatment prevents stress cracking.
Applications
| Industry | Components | Validation |
|---|---|---|
| Transportation | Railway overhead lines | 30+ years on Amtrak’s Northeast Corridor |
| Energy | Transmission line clamps | 500kV hardware by ABB in typhoon zones |
| Welding | Resistance welding electrodes | 500k+ welds in Lincoln Electric systems |
| Aerospace | Rocket engine ignition wiring | NASA SLS Artemis launch system certified |
| Robotics | High-flex motor brushes | 10M+ cycles on KUKA assembly arms |
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