Beryllium Copper Alloy

C17200 C17300 Copper Beryllium Material

Beryllium copper is a premium copper alloy with exceptional strength, fatigue resistance, electrical conductivity and non-magnetic performance for demanding precision applications.

What is Beryllium Copper?

Beryllium copper, also known as copper beryllium or CuBe alloy, is a high-performance copper alloy containing beryllium as the main alloying element. It combines the excellent electrical and thermal conductivity of copper with exceptional strength, elasticity, fatigue resistance and wear resistance.

Unlike ordinary copper alloys, beryllium copper can achieve very high mechanical strength after solution treatment and aging treatment. Its strength can approach that of some alloy steels while maintaining good electrical conductivity and non-magnetic properties.

Due to its unique combination of properties, beryllium copper is widely used in precision springs, electrical connectors, switches, aerospace components, molds, sensors and explosion-proof tools.

Common beryllium copper grades include C17200 and C17300. These alloys are available in various product forms including sheets, plates, strips, rods, bars, tubes, wires and customized precision components.

Key Features of Beryllium Copper Alloy

Beryllium copper provides a unique balance of mechanical, electrical and physical properties, making it suitable for demanding engineering applications:

  • Ultra-high strength: After aging treatment, beryllium copper provides strength comparable to many steels.
  • Excellent elasticity: Maintains stable spring performance under repeated loading conditions.
  • Good electrical conductivity: Provides reliable electrical performance while maintaining high strength.
  • Non-magnetic property: Suitable for sensitive electronic and precision applications.
  • Excellent fatigue resistance: Performs well under cyclic stress and vibration conditions.
  • Superior wear resistance: Suitable for moving contact parts and precision mechanisms.
  • Good corrosion resistance: Provides long service life in industrial and marine environments.
  • Excellent dimensional stability: Maintains accuracy in precision components and tooling applications.

Chemical Composition of Beryllium Copper

The properties of beryllium copper are mainly determined by beryllium content and additional alloying elements. Small amounts of beryllium significantly improve precipitation hardening capability and mechanical strength.

Grade Copper (Cu) Beryllium (Be) Other Elements
C17200 Balance 1.8 - 2.0% Co / Ni / Fe ≤ 0.6%
C17300 Balance 1.8 - 2.0% Lead (Pb) for improved machinability
C17510 Balance 0.4 - 0.8% Nickel / Cobalt

Physical Properties of Beryllium Copper

Beryllium copper maintains good conductivity while providing significantly improved mechanical properties compared with pure copper.

Property Typical Value
Density 8.25 - 8.30 g/cm³
Melting Temperature Approximately 870 - 980°C
Electrical Conductivity 15 - 30% IACS
Thermal Conductivity 60 - 120 W/m·K
Magnetic Property Non-magnetic

Mechanical Properties of Beryllium Copper

The outstanding mechanical properties of beryllium copper are mainly achieved through solution treatment and precipitation aging treatment.

Property Typical Range
Tensile Strength 900 - 1400 MPa
Yield Strength 600 - 1200 MPa
Elongation 1 - 20%
Hardness 250 - 420 HV
Fatigue Resistance Excellent

Heat Treatment of Beryllium Copper

Heat treatment is an essential process for achieving the high strength characteristics of beryllium copper alloys.

  1. Solution treatment: Heating dissolves beryllium into the copper matrix to create a supersaturated solid solution.
  2. Rapid cooling: Quenching preserves the supersaturated structure for subsequent aging treatment.
  3. Aging treatment: Controlled heating allows beryllium-rich phases to precipitate and significantly increase hardness and strength.
  4. Stress relief: Removes residual stress after machining or forming to improve dimensional stability.
Beryllium Copper Rods

BeCu Major Grades

Six principal beryllium copper grades covering high-strength, high-conductivity and free-machining variants.

UNS Grade Cu Be Ni Co Co+Ni+Fe Al Pb
C17200 CuBe2 Rem 1.8–2.0 — — ≥0.2 — ≤0.005
C17300 CuBe2Pb Rem 1.8–2.0 — — ≥0.2 — 0.2–0.6
C17000 CuBe1.7 Rem 1.6–1.8 — — ≥0.2 — ≤0.005
C17510 CuCo2Be Rem 0.2–0.6 — 2.4–2.7 — — ≤0.005
C17500 CuCo2Be Rem 0.4–0.7 — 2.4–2.7 — — ≤0.005
C17530 CuNi2Be Rem 0.2–0.4 1.4–2.2 — — 0.05–0.15 ≤0.005

Grade Selection Notes

  • C17200 / C17300: Maximum strength grades (Be ~2%). C17300 adds Pb for free machining.
  • C17000: Slightly lower Be (1.7%) for improved formability with high strength.
  • C17510 / C17500: High-conductivity grades with Co+Be precipitation hardening; C17510 offers the best conductivity.
  • C17530: Ni-Be variant with added Al for elevated temperature stability and corrosion resistance.

Lower-Cost Alternatives

While substitute alloys may reduce raw material cost, none match the unique performance profile of beryllium copper.

Performance Limitations of Substitutes

Extensive research into alternative copper alloys confirms that no other chemical element provides the same combination of ultra-high strength, fatigue resistance, and electrical/thermal conductivity offered by beryllium.

Application-Specific Considerations

  • Non-Critical Use: In certain low-stress applications (e.g., standard welding electrodes), alternative alloys may be considered to reduce material cost.
  • Safety-Critical Use: For high-performance or safety-critical components, uncontrolled substitution poses severe risks.

Regrettable Substitution

Substituting beryllium copper without rigorous engineering validation can lead to reduced technical performance, premature equipment failure, and significant reliability or safety hazards. This phenomenon is commonly referred to in materials engineering as “regrettable substitution.”

CNC Lathe Machining Metal Tube

CNC Lathe Machining Metal Tube

Why Choose

Beryllium Copper

High-performance copper alloy offering an unmatched combination of strength, conductivity and safety-critical properties.

The addition of up to 2% beryllium is the only method capable of dramatically increasing copper's tensile strength — from 200 MPa (electrolytic copper) to over 1500 MPa (CuBe2) — without compromising its thermal or electrical performance.

Balanced Performance

  • Conductivity: Maintains excellent electrical and thermal conductivity (typically 20–70% IACS depending on temper).
  • Fatigue Resistance: Superior resistance to cyclic loading, ideal for springs and flexible contacts.
  • Corrosion Resistance: Performs well in various industrial and marine environments.

Safety & Functional Properties

  • Non-Magnetic: Suitable for sensitive electronic and MRI equipment.
  • Non-Sparking: Critical for explosive atmospheres (oil & gas, mining, pyrotechnics).
  • Dimensional Stability: Excellent performance under high stress and temperature fluctuations.

Among the more than 200 types of copper alloys, beryllium copper offers the best combination of mechanical strength and electrical conductivity.

C17500 (CuCo2Be)

Precipitation-hardening beryllium cobalt copper. Higher strength than chrome copper / chrome zirconium copper, with slightly lower conductivity. Specified for mould inserts and resistance-welding electrodes.

Key Properties

  • Thermal Conductivity: ~3–4× higher than tool steel; enables rapid, uniform cooling of plastic moulds and reduces cycle time.
  • Mechanical Strength: Higher tensile strength and hardness than C18200 (Cr-Cu) and C15000 (Cr-Zr-Cu); suitable for high electrode pressure.
  • Conductivity Trade-off: Electrical and thermal conductivity lower than chrome copper / chrome zirconium copper, but still sufficient for welding duties.
  • Surface & Machining: Excellent polishability, wear resistance, anti-galling, corrosion resistance and machinability.
  • Weldability: Outstanding joinability; used as electrode, electrode arm, shank and insert.

Typical Applications

  • Plastic Injection Moulds: Inserts and cores in moulds; reduces hot-spot temperature, simplifies or eliminates water-line design.
  • Resistance Welding: Spot-welding electrodes for stainless steel and heat-resistant alloys; seam-welding wheel axles and bushings.
  • Electrode Hardware: Electrode shanks, arms, force-bearing holders, embedded electrodes.

Chemical Composition (ASTM B441)

Element Cu Be Co Ni Fe Pb
Content (%) Rem 0.4–0.7 2.4–2.7 — — ≤0.005
Frequently Asked Questions
Beryllium copper is a high-performance copper alloy containing beryllium as the main alloying element. It combines the excellent conductivity of copper with high strength, elasticity, fatigue resistance and wear resistance.
The most common beryllium copper grades are C17200 and C17300. C17200 provides the highest strength and elasticity, while C17300 offers improved machinability due to lead addition.
C17200 beryllium copper is widely used for electrical connectors, precision springs, aerospace components, switches, relays and other applications requiring high strength and excellent fatigue resistance.
C17200 has maximum mechanical strength and elasticity, making it ideal for high-performance applications. C17300 contains lead to improve machining performance and is preferred for precision machined components.
Yes. Beryllium copper provides good electrical conductivity while maintaining much higher strength than pure copper, making it suitable for electrical connectors and contact components.
No. Beryllium copper is a non-magnetic material, which makes it suitable for aerospace, electronic and precision applications where magnetic interference must be avoided.
Beryllium copper is an excellent spring material because of its high elastic limit, superior fatigue resistance and ability to maintain stable spring force during repeated loading cycles.
Compared with pure copper, beryllium copper offers significantly higher strength, hardness, fatigue resistance and wear resistance while still maintaining good electrical conductivity.
Beryllium copper provides much higher strength, better elasticity and superior fatigue resistance than brass, making it suitable for precision electrical and mechanical applications.
Compared with traditional bronze alloys, beryllium copper offers higher strength, better spring performance and excellent electrical conductivity, although it is generally more expensive.
Yes. Heat treatment is essential for beryllium copper. Solution treatment followed by aging treatment significantly improves hardness, tensile strength and elastic performance.
The hardness of beryllium copper depends on grade and heat treatment condition. Aged C17200 material can typically reach approximately 250-420 HV.
Beryllium copper is commonly supplied as sheets, plates, strips, rods, bars, tubes, wires and customized precision components according to customer requirements.
Yes. Beryllium copper can be machined by CNC machining, turning, milling and stamping. C17300 is especially suitable for precision machining applications.
Beryllium copper is widely used in electronics, aerospace, automotive, telecommunications, medical equipment, precision machinery and oil and gas industries.
Beryllium copper maintains stable contact pressure, excellent fatigue resistance and reliable electrical conductivity, making it ideal for long-life electrical connectors.
Yes. Beryllium copper provides good corrosion resistance in many industrial environments and can maintain long service life when properly selected and processed.
Beryllium copper can operate at elevated temperatures depending on application conditions. Its excellent strength retention makes it suitable for demanding thermal environments.
Finished beryllium copper products are safe for normal industrial use. During machining or grinding, proper dust control and occupational safety procedures should be followed.
Yes. We provide customized beryllium copper sheets, rods, tubes and precision components according to drawings, dimensions, mechanical requirements and application conditions.

Electrical and Electronic Applications of Beryllium Copper

Beryllium copper is one of the most important materials for high-performance electrical contact components. It provides a unique balance between conductivity and mechanical strength that cannot be achieved by pure copper.

Compared with conventional copper materials, beryllium copper maintains contact pressure for a longer period, reducing electrical resistance changes caused by fatigue, vibration and repeated operation.

Component Advantages of Beryllium Copper
Electrical Connectors High contact reliability, excellent spring force retention
Switch Components Long service life under repeated switching cycles
Electronic Springs Excellent fatigue resistance and dimensional stability
RF Components Stable electrical performance and precision manufacturing capability

Beryllium Copper for Springs and Precision Components

Beryllium copper is widely recognized as one of the best spring materials because it provides high elastic limits, excellent fatigue resistance and stable mechanical performance.

Components manufactured from beryllium copper can withstand millions of operating cycles while maintaining their original shape and contact force.

Component Type Reason for Selection
Precision Springs High elastic limit and excellent fatigue resistance
Contact Springs Stable electrical contact pressure
Diaphragms Excellent flexibility and corrosion resistance
Precision Clips High strength with good formability

Comparison Between Beryllium Copper and Other Copper Alloys

Compared with pure copper, brass and bronze, beryllium copper provides significantly higher strength and fatigue resistance, making it suitable for more demanding applications.

Material Strength Conductivity Elasticity Main Applications
Pure Copper Low Excellent Moderate Electrical conductors
Brass Medium Medium Good Valves, fittings, decoration
Tin Bronze High Lower Good Bearings and wear parts
Beryllium Copper Very High Good Excellent Precision and electrical components

Machining and Fabrication of Beryllium Copper

Beryllium copper can be manufactured through various processes including machining, stamping, forming, welding and precision fabrication.

During processing, proper dust control measures should be applied because beryllium compounds require careful handling according to industrial safety requirements.

Iridium Unique Properties

A range of Beryllium Copper Alloy Shapes

Sunny Steel supplies Beryllium Copper Alloy materials in various forms to meet different industrial manufacturing requirements.

Beryllium Copper Alloy Tube

Beryllium Copper Alloy Rod

Beryllium Copper Alloy Plate

Beryllium Copper Alloy Coil

Beryllium Copper Alloy Foil

Beryllium Copper Alloy Sheet

Beryllium Copper Alloy Bar

Beryllium Copper Alloy Components

Beryllium Copper Alloy Wire

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