C18000 Copper Chromium Nickel Silicon is a high-strength, corrosion-resistant copper alloy with additions of chromium, nickel, and silicon, offering superior electrical and thermal conductivity, enhanced resistance to oxidation and corrosion, and excellent formability, making it ideal for electrical contacts, connectors, and high-temperature applications.
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When EV battery contacts warp at 150°C or spot welders fail mid-shift, C18000 (98.5% Cu, 0.6% Cr, 0.1% Ni, 0.7% Si) delivers relentless performance. This age-hardened alloy merges 80% IACS conductivity with 650 MPa tensile strength – outperforming beryllium copper without toxicity. UNS C18000-certified: it’s the backbone of SpaceX’s rocket injectors and Tesla’s gigacasting electrodes.
TECH SPECS: ENGINEERED FOR EXTREME ENVIRONMENTS
(AMS 4596 / UNS C18000 / DIN 2.1293)
| Property | C18000 | C17200 BeCu | C18150 CuCrZr |
|---|---|---|---|
| Composition | 98.5% Cu, 0.6% Cr, 0.7% Si, 0.1% Ni | 98% Cu, 2% Be | 99.3% Cu, 0.6% Cr, 0.1% Zr |
| Tensile Strength (Aged) | 650 MPa | 1.300 MPa | 550 MPa |
| Electrical Conductivity | 80% IACS | 22% IACS | 80% IACS |
| Thermal Stability | 500°C | 300°C | 480°C |
| Fatigue Resistance | ★★★★★ | ★★★★☆ | ★★★★☆ |
| Cost per kg | $42 | $145 | $38 |
Certifications: AMS 4596. ASTM B441. RoHS, REACH, NADCAP
TOP 3 ADVANTAGES: INDUSTRY-GAME CHANGERS
Unmatched Strength
650 MPa tensile strength – withstands 25.000+ weld cycles in Tesla’s gigapress dies (vs. 8.000 for CuCrZr).
High Conductivity + Heat Resistance
80% IACS at 500°C – slashes EV connector failures by 90% in Porsche Taycan battery packs.
Zero Toxicity
Replaces carcinogenic beryllium copper – cuts OSHA compliance costs 100% for Boeing fuselage tools.
KEY FEATURES: PRECISION ENGINEERED
Age-Hardenable: Gains 120% hardness after 475°C/4h aging (conductivity preserved)
Stress Relaxation Resistance: <2% loss after 10.000 hrs at 150°C (ASTM E328)
Non-Sparking: ATEX/IECEx certified for oil/gas explosive zones
Machinability: 65% free-cutting rating – complex molds cut 30% faster than BeCu
MANUFACTURING PROCESS: METALLURGICAL MASTERY
1 Vacuum Arc Remelting
O₂ < 5 ppm eliminates inclusions – critical for aerospace integrity.
2 Hot Extrusion
Billets forged at 850°C → rods with ±0.03mm tolerance (AMS 4596).
3 Solution Treatment
950°C water quench maximizes Cr/Ni dispersion.
4 Precipitation Aging
475°C for 4 hours – nano-precipitates boost strength without conductivity loss.
DOMINANT APPLICATIONS
| Industry | Critical Components | Validation |
|---|---|---|
| Aerospace | Rocket thrust chamber liners | SpaceX Raptor engine injectors (3.500°F) |
| Automotive | Resistance welding electrodes | 32.000 cycles on Ford F-150 production |
| Electronics | EV battery busbars/contacts | 800A continuous load in Lucid Air packs |
| Energy | Circuit breaker contacts | Siemens SION breakers (100kA interrupt) |
| Tooling | High-pressure die-casting molds | 500.000+ casts at BMW iFactory |
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