UNS C17300 Beryllium Copper Alloy, also known as CuBe2Pb, CDA 173, or Alloy 173, is a high-strength, free-machining copper-beryllium alloy that combines excellent mechanical strength, good electrical and thermal conductivity, and superior machinability.
With a small addition of lead (~0.2%), C17300 offers better machinability than C17200, while maintaining comparable hardness and conductivity-making it ideal for precision connectors, electronic components, injection mold inserts, and aerospace parts.
Manufactured according to ASTM B196 / B197 / B194, C17300 is widely used where high reliability, fatigue resistance, and dimensional accuracy are required.
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Product Specifications
| Property | Specification |
|---|---|
| Alloy Designation | UNS C17300 / CDA 173 / CuBe2Pb / Alloy 173 |
| Standards | ASTM B196, ASTM B197, ASTM B194, RWMA Class 3 |
| Density | 8.26 g/cm³ |
| Electrical Conductivity | 20 – 30% IACS |
| Thermal Conductivity | 105 – 130 W/m·K |
| Melting Range | 865 – 985°C |
| Temper Conditions | A (Annealed), AT (Aged), HT (Heat Treated) |
| Available Forms | Rod, Bar, Plate, Sheet, Strip, Wire, Tube |
| Surface Finish | Bright, Polished, Ground, Machined |
| Packaging | Seaworthy wooden cases, anti-corrosion film wrapped |
Chemical Composition (Typical %)
| Element | Content (%) |
|---|---|
| Copper (Cu) | Balance |
| Beryllium (Be) | 1.80 – 2.00 |
| Lead (Pb) | 0.15 – 0.40 |
| Nickel (Ni) | ≤ 0.25 |
| Iron (Fe) | ≤ 0.15 |
| Cobalt (Co) | ≤ 0.25 |
| Others (Total) | ≤ 0.10 |
Mechanical Properties
| Condition | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HRB) | Conductivity (% IACS) |
|---|---|---|---|---|---|
| Annealed (A) | 480 – 600 | 320 – 400 | 25 – 30 | 70 – 80 | 30 – 35 |
| Aged (AT) | 1100 – 1250 | 900 – 1100 | 2 – 6 | 100 – 110 | 20 – 25 |
| Heat Treated (HT) | 1150 – 1250 | 950 – 1050 | 2 – 4 | 105 – 115 | 18 – 25 |
International Standard Size Chart (Metric & Imperial)
| Form | Size Range (Metric) | Size Range (Imperial) | Wall Thickness / Class | Dimensional Tolerance |
|---|---|---|---|---|
| Rod & Bar | Ø 5 – 200 mm | 3/16" – 8" | H / HT | ±0.05 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
⚙️ Free-Cutting Machinability – Contains lead for smoother machining performance.
⚡ High Strength & Conductivity – Combines hardness up to 1100 MPa with 20–30% IACS.
🔩 Excellent Dimensional Stability – Minimal distortion after heat treatment.
🔥 High Fatigue & Wear Resistance – Ideal for high-load and cyclic stress applications.
🧲 Non-Sparking & Non-Magnetic – Safe for explosive or magnetic-sensitive environments.
🧰 High Polishability – Perfect for mold inserts and precision tooling.
Applications
Electrical connectors, relays, and switch contacts
Mold inserts and precision tooling
Aerospace bearings, bushings, and fasteners
Electronic connectors and spring contacts
Resistance welding components (RWMA Class 3)
High-reliability mechanical parts requiring tight tolerances
FAQ (Frequently Asked Questions)
Q1: What is the difference between C17300 and C17200?
A1: C17300 includes 0.2–0.4% lead for better machinability, while C17200 is lead-free but slightly stronger.
Q2: What standards apply to C17300?
A2: C17300 complies with ASTM B196 (rod/bar), ASTM B197 (wire), and ASTM B194 (strip/sheet).
Q3: Is it safe to machine Beryllium Copper?
A3: Yes, when proper ventilation and dust control are used. Machining fumes or dust should not be inhaled.
Q4: What hardness can be achieved after aging?
A4: Typically 100–115 HRB, equivalent to 350–400 HV.
Q5: Can it be heat treated after machining?
A5: Yes, C17300 can be aged after machining to reach full hardness and strength.
Q6: What is the electrical conductivity range?
A6: Around 20–30% IACS, depending on temper.
Q7: Is it magnetic?
A7: No, it's non-magnetic and non-sparking.
Q8: What surface finishes are available?
A8: Mill finish, polished, ground, or bright finish.
Q9: What certifications are provided?
A9: EN 10204 3.1 MTC, SGS/BV third-party reports, and heat treatment certificates.
Q10: Can it be exported worldwide?
A10: Yes, standard export packaging ensures safe shipment to North America, Europe, and Asia.
Inspection & Quality Assurance
All UNS C17300 Beryllium Copper products are strictly tested under ISO 9001:2015 and ASTM B196/B197 standards to ensure consistent quality and traceability.
Quality Control Process
Raw Material Inspection: Spectrochemical analysis for Be and Pb content.
Dimensional Testing: Diameter, straightness, and wall thickness verification.
Mechanical Testing: Tensile, yield, elongation, and hardness tests per batch.
Electrical Conductivity Test: Verified using IACS standard equipment.
Non-Destructive Testing: Eddy current and ultrasonic testing to detect surface/internal flaws.
Aging Uniformity Check: Ensures optimal hardness and grain structure after heat treatment.
Third-Party Verification
Inspection services available from SGS, BV, TUV, or Intertek.
Mill Test Certificates issued to EN 10204 3.1/3.2 standard.
Documents Supplied
Mill Test Certificate
Dimensional Report
Heat Treatment & Conductivity Report
Certificate of Origin
Packing List & Invoice
Looking for a reliable C17300 Beryllium Copper Alloy supplier?
We provide high-precision rods, bars, strips, and sheets for electronic, aerospace, and precision tooling industries.
Our address
Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province
Phone Number
+86 15769214734
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