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Zirconium Copper (CuZr)
Product Overview
Zirconium Copper (CuZr) is a high-performance copper alloy engineered for applications that demand a rare combination of high electrical/thermal conductivity and better softening resistance at elevated temperatures compared to pure copper. R V Metal Corporation supplies CuZr in multiple product forms including sheets, plates, rods, and bars, suitable for precision components, heavy-duty current carrying parts, and high-heat industrial tooling.
CuZr is widely selected where standard ETP/DHP copper loses strength due to heat exposure. Typical uses include resistance welding parts (electrodes, holders, arms), busbar and switchgear components, spot-welding shanks, heat-sink and thermal blocks, and high-load electrical contacts. It also offers good machinability and fabrication performance when processed under the correct temper and heat treatment.
We can offer CuZr products in custom sizes, cut-to-length, and project-specific specifications with test certification, ensuring consistent chemistry, conductivity, and mechanical properties for OEM and EPC requirements.
Technical Specifications
| Parameter | Specification |
|---|---|
| Material Type | Zirconium Copper Alloy (CuZr) |
| UNS Designation | C15000 / C15100 (Grade dependent) |
| Alloying Element | Zirconium (Zr) |
| Available Product Forms | Sheets, Plates, Rods, Bars |
| Manufacturing Process | Hot Rolled, Cold Rolled, Extruded, Drawn |
| Thickness / Diameter Range | Sheets & Plates: 0.5 mm to 100 mm Rods & Bars: 6 mm to 250 mm |
| Standard Lengths | 3000 mm, 6000 mm or Cut-to-Length |
| Temper / Condition | Annealed (O), Solution Treated, Aged (HT) |
| Electrical Conductivity | 75–90 % IACS (Typical) |
| Thermal Conductivity | ≈ 300–330 W/m·K |
| Density | 8.89 g/cm³ |
| Melting Range | 1080 °C – 1090 °C |
| Heat Resistance | Excellent resistance to softening at elevated temperatures |
| Machinability | Good (Better than pure copper) |
| Formability | Good (Best in Annealed condition) |
| Weldability | Excellent (Resistance & Spot Welding) |
| Surface Finish | Mill Finish, Bright Drawn, Polished |
| Standards | ASTM, EN, DIN, JIS (as applicable) |
| Testing & Certification | Mill Test Certificate (EN 10204 3.1), Chemical & Mechanical Tested |
| Applications | Resistance Welding Electrodes, Busbars, Switchgear Parts, Heat Sinks, Electrical Contacts |
Chemical Composition
| Element | Symbol | Composition (% by Weight) |
|---|---|---|
| Copper | Cu | ≥ 99.85 |
| Zirconium | Zr | 0.05 – 0.15 |
| Iron | Fe | ≤ 0.05 |
| Lead | Pb | ≤ 0.02 |
| Oxygen | O | ≤ 0.02 |
| Other Impurities | — | ≤ 0.10 (Total) |
UNS Codes & Grades
| UNS Code | Common Designation | International Grade | Standard / Specification | Typical Product Forms |
|---|---|---|---|---|
| C15000 | Zirconium Copper | CuZr | ASTM B224, ASTM B152, ASTM B370 | Sheets, Plates, Rods, Bars |
| C15100 | Zirconium Copper (Deoxidized) | CuZr-DHP | ASTM B224, ASTM B152 | Sheets, Plates, Rods |
| — | CuZr | CW120C | EN 12163, EN 12164, EN 12165 | Rods, Bars, Forged Sections |
| — | CuZr | 2.1580 | DIN EN Standards | Sheets, Plates, Bars |
| — | Zirconium Copper | GB/T CuZr | GB/T 5231 (China) | Sheets, Rods, Plates |
Mechanical, Physical & Fabrication Properties
| Property | Typical Value / Range | Unit | Remarks |
|---|---|---|---|
| Density | 8.89 | g/cm³ | Similar to pure copper |
| Melting Point | 1080 – 1085 | °C | Slightly higher than ETP copper due to Zr addition |
| Tensile Strength | 380 – 620 | MPa | Depends on temper (solution treated vs aged) |
| Yield Strength (0.2%) | 250 – 520 | MPa | High after precipitation hardening |
| Elongation | 10 – 30 | % | Lower in peak-aged condition |
| Hardness | 110 – 180 | HB | Can exceed phosphor bronze in aged state |
| Electrical Conductivity | 75 – 90 | % IACS | Key advantage over CuCr and BeCu |
| Thermal Conductivity | 320 – 350 | W/m·K | Excellent heat dissipation |
| Coefficient of Thermal Expansion | 16.5 – 17.0 | µm/m·K | Stable under thermal cycling |
| Elastic Modulus | 120 – 130 | GPa | Comparable to copper alloys |
| Softening Temperature | > 500 | °C | Much higher than pure copper |
| Machinability | Good | — | Better than BeCu, worse than free-cutting brass |
| Formability | Good | — | Excellent in solution-annealed condition |
| Weldability | Excellent | — | Superior to CuCr and BeCu |
| Hot Workability | Excellent | — | Suitable for extrusion and forging |
| Cold Workability | Good | — | Recommended before aging |
| Corrosion Resistance | Excellent | — | Resistant to oxidation and industrial atmospheres |
Common Names & International Identifiers
| Region / Standard System | Grade / Designation | Common Name | Notes |
|---|---|---|---|
| UNS (USA) | C15100 | Zirconium Copper | Most widely specified CuZr grade globally |
| ASTM (USA) | ASTM B224 / B552 | Zirconium Copper Alloy | Used for rods, bars, plates, welding components |
| EN (Europe) | CW120C | CuZr | EN 12163 / 12164 / 12165 compliant |
| DIN (Germany) | 2.1580 | CuZr | Legacy DIN designation still referenced |
| ISO | CuZr | Copper Zirconium Alloy | Generic ISO naming convention |
| JIS (Japan) | CZ120 | Zirconium Copper | Used in electrical and welding applications |
| GB (China) | QZr0.15 | Zirconium Copper Alloy | Common Chinese export-grade designation |
| BS (United Kingdom) | BS C151 | CuZr | Aligned with UNS C15100 |
| IS (India) | IS 613 (Cu-Zr Type) | Zirconium Copper | Often supplied against UNS / EN equivalence |
| Trade / Industry Name | — | High Conductivity Zirconium Copper | Used in resistance welding and electrodes |
| Commercial Name | — | CuZr Welding Copper | Non-standard but common in RFQs |
Standards & International Equivalents
| Country / Region | Standard | Grade / Designation | Product Forms Covered | Equivalent To |
|---|---|---|---|---|
| USA | ASTM B224 | C15100 | Rods, Bars | EN CW120C, DIN 2.1580 |
| USA | ASTM B552 | C15100 | Plates, Sheets | EN CW120C |
| USA | UNS | C15100 | Sheets, Rods, Bars, Plates | Global reference grade |
| Europe | EN 12163 | CW120C | Rods, Bars | UNS C15100 |
| Europe | EN 12164 | CW120C | Extruded Rods & Profiles | UNS C15100 |
| Europe | EN 12165 | CW120C | Plates, Sheets, Strips | ASTM B552 C15100 |
| Germany | DIN | 2.1580 | Sheets, Rods, Plates | EN CW120C / UNS C15100 |
| ISO | ISO 431 | CuZr | General wrought products | UNS C15100 |
| Japan | JIS H3250 | CZ120 | Rods, Bars | UNS C15100 |
| China | GB / T 5231 | QZr0.15 | Sheets, Rods, Plates | EN CW120C |
| United Kingdom | BS | CZ120 / C151 | Wrought Products | UNS C15100 |
| India | IS 613 | Cu-Zr Alloy | Sheets, Rods, Bars | UNS C15100 (by equivalence) |
Applications
| Industry / Sector | Application | Preferred Product Form | Why Zirconium Copper (CuZr) is Used |
|---|---|---|---|
| Electrical & Power | High-current contacts, bus bars | Plates, Bars | High electrical conductivity with improved strength and thermal stability |
| Welding Industry | Resistance welding electrodes & holders | Rods, Bars | Excellent softening resistance at elevated temperatures |
| Automotive | Spot welding tips, contact components | Rods | Maintains hardness and conductivity under repeated thermal cycling |
| Electrical Equipment | Switchgear components | Sheets, Plates | High wear resistance with good electrical performance |
| Electronics | Connector pins, conductive frames | Rods, Bars | Good machinability combined with stable conductivity |
| Power Distribution | Transformer terminals & connectors | Plates, Bars | Low contact resistance and high mechanical integrity |
| Aerospace | Electrical grounding components | Sheets, Bars | High fatigue resistance and thermal stability |
| Industrial Machinery | Conductive wear parts | Plates, Bars | Better wear resistance than pure copper |
| Railways | Overhead line fittings & connectors | Bars, Plates | High conductivity with enhanced mechanical strength |
| Renewable Energy | Solar & wind power electrical contacts | Sheets, Bars | Long service life under high current loads |
| Heavy Electrical Fabrication | High-duty electrical assemblies | Plates | Superior heat resistance compared to ETP copper |
Common Zirconium Copper (CuZr) Forms & Dimensions Chart
| Product Form | Typical Supply Condition | Standard Size Range (Indicative) | Typical Length / Sheet Size | Notes (What Buyers Expect) |
|---|---|---|---|---|
| Sheets | Annealed / Cold Rolled / Heat Treated (as required) | Thickness: 0.20–10.00 mm Width: 1000–1500 mm |
Length: 2000–6000 mm (cut-to-size) | Used for fabricated parts, contact plates, EDM/weld fixtures |
| Plates | Hot Rolled / Solution Treated & Aged (as required) | Thickness: 10–100 mm Width: 600–2000 mm |
Length: 1000–6000 mm (cut-to-size) | Used where rigidity + heat resistance matters |
| Round Rods | Drawn / Turned / Ground | Dia: 6–200 mm | Standard: 3 m / 6 m Custom: cut lengths |
Welding electrodes, high-current parts, machined components |
| Flat Bars | Rolled / Milled edges (optional) | Thickness: 3–100 mm Width: 10–300 mm |
Standard: 3 m / 6 m Custom: cut lengths |
Busbar-style parts, fixtures, electrical fabrication |
| Square Bars | Drawn / Machined | AF (Across Flats): 8–100 mm | Standard: 3 m / 6 m | Good for machining blocks, conductive tooling |
| Form | Weight Formula | Units / Inputs | Quick Notes |
|---|---|---|---|
| Round Rod | kg/m = 0.006981 × D² | D in mm | Based on density ≈ 8.89 g/cm³ (Cu alloy typical) |
| Square / Flat / Rectangular Bar | kg/m = 0.00889 × (W × T) | W, T in mm | For square bar: W = T = side (mm) |
| Sheet / Plate | kg/m² = 8.89 × t | t in mm | Multiply by area (m²) for total weight |
| Rod Dia (mm) | Theoretical Weight (kg/m) | Rod Dia (mm) | Theoretical Weight (kg/m) |
|---|---|---|---|
| 6 | 0.251 | 25 | 4.363 |
| 8 | 0.447 | 30 | 6.283 |
| 10 | 0.698 | 40 | 11.170 |
| 12 | 1.005 | 50 | 17.453 |
| 16 | 1.787 | 60 | 25.132 |
| 20 | 2.792 | 80 | 44.678 |
| Flat Bar Size (W × T, mm) | Theoretical Weight (kg/m) | Flat Bar Size (W × T, mm) | Theoretical Weight (kg/m) |
|---|---|---|---|
| 20 × 3 | 0.533 | 50 × 6 | 2.667 |
| 25 × 3 | 0.667 | 60 × 6 | 3.200 |
| 25 × 5 | 1.111 | 80 × 8 | 5.689 |
| 30 × 5 | 1.333 | 100 × 10 | 8.890 |
| 40 × 5 | 1.778 | 120 × 12 | 12.802 |
| 50 × 5 | 2.223 | 150 × 15 | 20.003 |
| Thickness (mm) | Theoretical Weight (kg/m²) | Thickness (mm) | Theoretical Weight (kg/m²) |
|---|---|---|---|
| 0.50 | 4.445 | 6 | 53.340 |
| 1.00 | 8.890 | 8 | 71.120 |
| 2.00 | 17.780 | 10 | 88.900 |
| 3.00 | 26.670 | 12 | 106.680 |
| 4.00 | 35.560 | 20 | 177.800 |
| 5.00 | 44.450 | 25 | 222.250 |
| Product | Size (mm) | Area (m²) | Thickness (mm) | Theoretical Weight (kg) | How Weight is Calculated |
|---|---|---|---|---|---|
| Sheet | 1000 × 2000 | 2.00 | 1.0 | 17.780 | kg = (Area × (8.89 × t)) |
| Sheet | 1250 × 2500 | 3.125 | 2.0 | 111.125 | 3.125 × (8.89 × 2) |
| Plate | 1000 × 2000 | 2.00 | 10.0 | 177.800 | 2.00 × (8.89 × 10) |
| Plate | 1500 × 3000 | 4.50 | 12.0 | 576.090 | 4.50 × (8.89 × 12) |
