Zirconium Copper (C15000 / CuCrZr / CW106C)
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Zirconium Copper (C15000 / CuCrZr / CW106C) Brochure
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Descriptions
Navkar Metal Syndicate supplies premium-grade Zirconium Copper (C15000 / CuCrZr / CW106C), a high-performance copper alloy engineered for applications demanding exceptional electrical and thermal conductivity combined with superior strength and wear resistance. Known for its ability to retain mechanical properties at elevated temperatures, CuCrZr is one of the most versatile alloys for high-current, high-stress environments.
The addition of small amounts of chromium (Cr) and zirconium (Zr) to pure copper enables controlled precipitation hardening, resulting in a material that achieves up to 80–90% IACS conductivity while maintaining excellent hardness, creep resistance, and fatigue strength. These characteristics make Zirconium Copper ideal for spot welding electrodes, electrical connectors, switchgear parts, heat sinks, and mold components.
Every batch from Navkar Metal Syndicate undergoes precise metallurgical control and is supplied with Mill Test Certificates (MTCs) conforming to ASTM B441 / B747 / EN CW106C standards. Available in rods, bars, plates, and custom-machined components, our CuCrZr products are designed to deliver outstanding durability, low maintenance, and consistent performance in demanding industrial and electrical applications.
Chemical Composition
Zirconium Copper (CuCrZr) is a precipitation-hardened copper alloy containing small additions of chromium (Cr) and zirconium (Zr). These elements enhance its mechanical strength, softening resistance, and wear performance while retaining high electrical and thermal conductivity.
| Element | Composition (% by Weight) | Typical Alloy Grades |
|---|---|---|
| Copper (Cu) | Balance (typically ≥ 99.0%) |
UNS C15000 CuCrZr EN CW106C ASTM B441 / B747 |
| Chromium (Cr) | 0.4 – 1.2 | |
| Zirconium (Zr) | 0.05 – 0.20 | |
| Other Elements (Total) | ≤ 0.10 | |
| Impurities (Each) | ≤ 0.05 |
The carefully controlled balance of chromium and zirconium in C15000 improves precipitation hardening, allowing for excellent strength, hardness, and conductivity stability during prolonged exposure to elevated temperatures.
Mechanical, Physical & Fabrication Properties
Zirconium Copper (CuCrZr / C15000) is a heat-treatable alloy that offers a superior combination of high strength, excellent electrical and thermal conductivity, and outstanding resistance to softening at elevated temperatures. Its balance of hardness and ductility makes it ideal for welding electrodes, switchgear parts, and heavy-duty electrical connectors.
| Property | Condition / Temper | Typical Values |
|---|---|---|
| Tensile Strength (UTS) | Solution Treated & Aged (Heat Treated) | 450 – 550 MPa |
| Yield Strength (0.2% Proof) | Heat Treated | 300 – 450 MPa |
| Elongation (% in 50 mm) | Heat Treated | 10 – 20% |
| Hardness (HV) | After Aging | 120 – 150 HV |
| Electrical Conductivity | At 20°C | 75 – 90 % IACS |
| Thermal Conductivity | At 20°C | 320 – 340 W/m·K |
| Density | — | 8.9 g/cm³ |
| Coefficient of Thermal Expansion | 20–300°C | 16.9 × 10⁻⁶ /°C |
| Softening Temperature | — | ≥ 500°C |
| Fabrication Properties | Machinability Formability Weldability Brazing |
Good Good Excellent (with inert gas) Excellent |
Note: Actual values may vary depending on processing method, temper condition, and form (rod, plate, tube, or wire). Heat-treated CuCrZr maintains excellent hardness and conductivity stability even after prolonged thermal cycling, making it a preferred alloy for demanding electrical and tooling applications.
Applications
Zirconium Copper (CuCrZr / C15000) is selected for applications that demand a unique combination of high electrical and thermal conductivity, mechanical strength, and resistance to softening under heat or electrical loading. It performs exceptionally well in high-temperature, high-current, or wear-intensive environments.
- Resistance welding electrodes, seam welding wheels, and caps
- Switchgear, circuit breaker, and contact components
- Heat sinks, thermal plates, and electrical bus bars
- Mold cores, liners, and inserts for plastic injection or casting dies
- Electrode holders and welding fixtures in automated manufacturing
- High-current connectors, transformer parts, and commutator segments
- Vacuum and aerospace components requiring conductivity with strength
- Induction coil parts and furnace components exposed to cyclic heating
With its excellent balance of strength, conductivity, and oxidation resistance, CuCrZr is the alloy of choice for manufacturers across electrical, automotive, aerospace, and tooling industries. Its durability and low maintenance requirements ensure extended component life in both industrial and high-performance applications.
Standards & International Equivalents:
Zirconium Copper (CuCrZr / C15000) conforms to several international standards that define its composition, mechanical properties, and manufacturing processes. These specifications ensure consistent quality and performance across industries such as aerospace, electrical, and resistance welding.
| Standard / Specification | Designation | Description / Region |
|---|---|---|
| UNS | C15000 | Unified Numbering System (USA) |
| ISO | CuCrZr | International Standard (General Use) |
| EN | CW106C | European Standard (EN 12163 / EN 12420) |
| DIN | 2.1293 / CuCr1Zr | German Industrial Standard |
| BS | CC102 / CuCrZr | British Standard (BS 2871 / BS 2872) |
| ASTM / ASME | B441 / B747 | American Standard for Rods, Bars, Plates & Forgings |
| RWMA | Class 2 / Class 3 | Resistance Welding Manufacturers Association (USA) |
| JIS | C15000 Equivalent | Japanese Industrial Standard (CuCrZr) |
Note: C15000 is commonly supplied under equivalent designations such as CuCr1Zr, CW106C, and RWMA Class 2. It meets or exceeds performance requirements across major international standards, ensuring interchangeability for global manufacturing and export projects.
Common Names & International Identifiers
Zirconium Copper (CuCrZr / C15000) is a high-conductivity, high-strength copper alloy known by several trade names and designations across different countries and standards. It is widely recognized for its excellent combination of electrical conductivity, thermal stability, and mechanical strength, making it a preferred material in welding, tooling, and high-performance electrical applications.
| Category | Designation / Identifier |
|---|---|
| Common / Trade Names | Zirconium Copper, CuCrZr, Copper-Chromium-Zirconium Alloy, RWMA Class 2 Copper, CuCr1Zr |
| UNS Number | C15000 |
| European EN Designation | CW106C (EN 12163 / EN 12420) |
| ISO Designation | CuCrZr |
| DIN / WNR Equivalent | 2.1293 / CuCr1Zr |
| BS (British Standard) | CC102 / CuCrZr |
| JIS (Japanese Standard) | C15000 Equivalent (CuCrZr) |
| RWMA Classification | Class 2 (for resistance welding electrodes) |
| Typical Applications Identifier | CuCrZr High Conductivity Copper Alloy |
Summary: Zirconium Copper is interchangeably known as CuCrZr, CW106C, and C15000 across international standards. Its combination of strength retention at elevated temperatures, high electrical conductivity, and wear resistance makes it one of the most versatile copper alloys in global industrial use.
Common Product Forms & Dimensions
Zirconium Copper (C15000 / CuCrZr / CW106C) is a high-performance alloy available in a wide range of semi-finished and finished forms. It combines superior electrical conductivity with high mechanical strength, making it ideal for precision components in electrical, thermal, and welding applications.
Available Forms
- Bars: Round, flat, square, hexagonal (hex), and rectangular bars
- Rods: Solid and precision-machined rods for electrical and mechanical use
- Plates & Sheets: Available in hot-rolled, cold-rolled, or polished finishes
- Tubes / Hollow Bars: Seamless and hollow sections for fluid and thermal transfer systems
- Wires: Round or profiled wire for electrical, welding, and connector applications
- Forged Blocks & Components: Including welding wheels, short-circuit rings, and custom machined parts
Products are supplied in various surface finishes — cold drawn, hot rolled, polished, smooth turned, and ground — to meet specific industrial and engineering requirements.
Typical Size Ranges
| Form | Typical Size Range (Metric) | Typical Size Range (Imperial) |
|---|---|---|
| Round Bars | Diameter: 3 mm – 800 mm | Diameter: 1/8" – 30"+ |
| Flat Bars | Thickness: 2 mm – 100 mm; Width: 10 mm – 500 mm | Thickness: ~3/16" – 4"; Width: ~3/8" – 20" |
| Square Bars | 4 mm – 100 mm (side length) | Varies |
| Hex Bars | 2 mm – 100 mm (A/F – across flats) | Varies |
| Plates / Sheets | Thickness: 3 mm – 44+ mm; Width: up to 1200 mm; Length: up to 2400 mm | Varies |
| Hollow Bars / Tubes | OD: 32 mm – 250 mm; ID: 16 mm – 200 mm | Varies |
Note: Actual size availability depends on the production method — hot rolled, cold drawn, or machined finish. Standard lengths generally range from 1 meter to 5 meters, with custom cuts and tolerances available upon request.
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