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UNS C17500 Beryllium Copper Alloy, also known as CuCo2Be or Alloy 10, is a high-performance copper-cobalt-beryllium alloy offering an excellent balance between high strength, electrical conductivity, and thermal stability. It provides higher hardness than pure copper while retaining superior conductivity, making it ideal for welding electrodes, electrical connectors, resistance welding parts, and precision components.
Manufactured according to ASTM B441, B534, RWMA Class 4, and ISO 1634, C17500 Alloy exhibits outstanding wear resistance, fatigue life, and non-sparking characteristics, suitable for demanding applications in aerospace, automotive, and heavy electrical industries.
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Product Specifications
| Property | Specification |
|---|---|
| Alloy Designation | UNS C17500 / CuCo2Be / Alloy 10 |
| Standards | ASTM B441, ASTM B534, RWMA Class 4 |
| Density | 8.85 g/cm³ |
| Electrical Conductivity | 18 – 25% IACS |
| Thermal Conductivity | 210 W/m·K |
| Melting Range | 870 – 980°C |
| Temper Conditions | AT (Aged), HT (Heat Treated), H (Hard), Spring Temper |
| Forms Available | Rod, Bar, Plate, Sheet, Strip, Wire, Tube |
| Surface Finish | Bright, Polished, Machined, Mill Finish |
| Packaging | Standard seaworthy export package (wooden box & plastic film) |
Chemical Composition (Typical %)
| Element | Content (%) |
|---|---|
| Copper (Cu) | Balance |
| Beryllium (Be) | 0.35 – 0.60 |
| Cobalt (Co) | 1.80 – 2.70 |
| Nickel (Ni) | ≤ 0.30 |
| Iron (Fe) | ≤ 0.15 |
| Lead (Pb) | ≤ 0.05 |
| Others (Total) | ≤ 0.10 |
Mechanical Properties
| Condition | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HRB) | Conductivity (% IACS) |
|---|---|---|---|---|---|
| Annealed (O) | 480 – 600 | 320 – 400 | 20 – 25 | 70 – 80 | 25 – 30 |
| Aged (AT) | 930 – 1080 | 800 – 950 | 3 – 8 | 95 – 105 | 18 – 25 |
| Heat Treated (HT) | 1100 – 1250 | 900 – 1050 | 2 – 5 | 105 – 110 | 18 – 22 |
International Standard Size Chart (Metric & Imperial)
| Form | Size Range (Metric) | Size Range (Imperial) | Wall Thickness / Class | Dimensional Tolerance |
|---|---|---|---|---|
| Rod & Bar | Ø 6 – 250 mm | 1/4" – 10" | H / HT | ±0.10 mm |
| Plate | 2 – 60 mm thick | 0.08" – 2.36" | Standard / Precision | ±0.20 mm |
| Sheet | 0.3 – 6.0 mm | 0.012" – 0.24" | H / 1/2H / AT | ±0.05 mm |
| Strip | 0.1 – 3.0 mm | 0.004" – 0.12" | H / HT | ±0.03 mm |
| Tube | OD 6 – 150 mm | 1/4" – 6" | 0.5 – 5.0 mm WT | OD ±0.10 mm, WT ±10% |
| Wire | 0.5 – 8 mm | 0.02" – 0.31" | Spring Temper | ±0.02 mm |
Features & Advantages
✅ High Strength with Conductivity – Excellent balance of hardness and electrical performance.
✅ Outstanding Fatigue Resistance – Ideal for repeated mechanical loading.
✅ Non-Sparking & Non-Magnetic – Safe for hazardous or explosive environments.
✅ Excellent Thermal Stability – Maintains strength up to 315°C (600°F).
✅ High Wear Resistance – Suitable for welding electrodes and tooling.
✅ Good Machinability & Polishing Properties – Enables fine surface finish.
✅ RWMA Class 4 Certified Material.
Applications
Resistance welding electrodes and holders (RWMA Class 4)
Electrical connectors, switches, and relay components
Oil & gas drilling tools (non-sparking parts)
Mold inserts and die-casting components
Aerospace fasteners and precision bushings
Heavy-duty contact tips and mechanical springs
FAQ (Frequently Asked Questions)
Q1: What's the difference between C17500 and C17510 Beryllium Copper?
A1: C17500 contains cobalt for higher hardness, while C17510 contains nickel for improved conductivity.
Q2: What standard applies to C17500?
A2: It conforms to ASTM B441, ASTM B534, and RWMA Class 4.
Q3: Can it be heat-treated to improve strength?
A3: Yes, C17500 is age-hardenable-heat treatment at ~315°C enhances strength and hardness.
Q4: What is the electrical conductivity range?
A4: Typically between 18–25% IACS, depending on condition and aging.
Q5: Is it magnetic?
A5: No, C17500 is non-magnetic and non-sparking.
Q6: Can it be used for welding electrodes?
A6: Yes, it's the preferred alloy for RWMA Class 4 welding electrodes due to its strength and wear resistance.
Q7: What surface finishes are available?
A7: Mill finish, bright polished, ground, and machined surfaces are available.
Q8: What's the density and melting point?
A8: Density is 8.85 g/cm³, and melting range is 870–980°C.
Q9: Is C17500 easy to machine?
A9: Yes, especially in the annealed or aged temper.
Q10: What certifications are provided?
A10: EN 10204 3.1 Mill Test Certificate, and third-party inspection reports from SGS, BV, or TUV.
Inspection & Quality Assurance
To guarantee the highest product quality, all C17500 Beryllium Copper products undergo a comprehensive inspection and testing program under ISO 9001:2015 and ASTM B441/B534 standards.
Quality Control Procedures
Raw Material Verification: Spectrometer testing for Be and Co content.
Mechanical Testing: Tensile, yield, elongation, and hardness tests.
Electrical Conductivity Measurement: IACS value confirmed per batch.
Dimensional Inspection: OD, wall thickness, and straightness checked for all rods and tubes.
Nondestructive Testing: Eddy current and ultrasonic testing for internal defects.
Microstructure Analysis: Ensures correct aging and uniform grain structure.
Third-Party Verification
Independent inspections by SGS, BV, TUV, Intertek are available upon request.
All shipments accompanied by Mill Test Certificate (EN 10204 3.1/3.2).
Documentation Supplied
Mill Test Certificate
Heat Treatment Record
Dimensional Report
Packing List & Certificate of Origin
Looking for a reliable C17500 Beryllium Copper Alloy manufacturer and exporter?
We supply bars, rods, sheets, strips, and tubes with guaranteed mechanical performance and global certifications.
Our address
Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province
Phone Number
+86 15769214734
office@dongmjd.com
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