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EnglishC17200 Beryllium Copper: Composition, Physical Properties, and Key Applications
Publish:
2026-01-24 09:40
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C17200 beryllium copper is a high-performance alloy primarily composed of copper, beryllium, and cobalt or nickel, known for its exceptional strength, conductivity, and corrosion resistance. Key physical properties include high hardness (up to 42 HRC after heat treatment), good electrical conductivity (22-28% IACS), and thermal stability. Main applications span electronics (connectors and springs), aerospace (bearings and bushings), and industrial tools (molds and safety equipment), making it vital for demanding environments. This article details its composition, properties, and uses based on ASTM standards.
C17200 beryllium copper, classified under ASTM B196, is a precipitation-hardening copper alloy renowned for its unique combination of mechanical and electrical properties. It is widely used in industries requiring high reliability under stress, corrosion, or thermal conditions. Below, we explore its composition, physical properties, and primary applications in detail.
Composition
The chemical composition of C17200 is tightly controlled to ensure optimal performance, with key elements including:
- Copper (Cu): Approximately 97.0–98.5%, forming the base matrix for ductility and conductivity.
- Beryllium (Be): 1.80–2.00%, the primary hardening agent that enhances strength through precipitation.
- Cobalt (Co) or Nickel (Ni): 0.20–0.60%, added to refine grain structure and improve workability.
- Iron (Fe): ≤0.15%, and other trace elements like silicon (Si) ≤0.20%, to minimize impurities and ensure consistency.
This composition allows C17200 to achieve superior properties after heat treatment, such as solution annealing and aging, which precipitates beryllium particles for increased hardness.
Physical Properties
C17200 exhibits outstanding physical characteristics, making it suitable for high-stress applications:
- Density: Approximately 8.25 g/cm³, similar to other copper alloys, facilitating lightweight designs.
- Hardness: Ranges from 30–45HRC (Rockwell C scale) after aging, providing excellent wear resistance.
- Electrical Conductivity: 22–28% IACS (International Annealed Copper Standard), enabling efficient use in electrical components.
- Thermal Properties:
- Thermal conductivity: 105–120 W/m·K, supporting heat dissipation.
- Coefficient of thermal expansion: 17.8 × 10⁻⁶ /°C, ensuring dimensional stability.
- Mechanical Strength:
- Tensile strength: 1,000–1,400 MPa (145,000–203,000 psi) in aged condition.
- Yield strength: 800–1,200 MPa (116,000–174,000 psi).
- Elongation: 1–10%, depending on temper, balancing ductility with rigidity.
- Corrosion Resistance: Excellent resistance to atmospheric, marine, and chemical exposures due to a protective oxide layer.
These properties are achieved through precise heat treatment, where solution annealing at 760–790°C followed by aging at 315–345°C optimizes microstructure.
Main Applications
C17200 is favored in sectors demanding high performance, reliability, and longevity:
- Electronics and Electrical:
- Used in connectors, switches, and relays due to high conductivity and spring properties.
- Ideal for battery contacts and semiconductor test probes, where low resistance and durability are critical.
- Aerospace and Defense:
- Employed in bearings, bushings, and fasteners for aircraft engines, benefiting from fatigue resistance and thermal stability.
- Applied in missile components and radar systems for its non-sparking nature.
- Industrial Tools:
- Common in injection molds, die-casting tools, and plastic molding dies, leveraging high hardness to withstand abrasion.
- Used for safety tools like wrenches and hammers in explosive environments, as it minimizes spark risks.
- Other Uses:
- Springs and bellows in automotive and medical devices, where cyclic loading resistance is essential.
- Oil and gas equipment, such as valves and seals, due to corrosion resistance in harsh conditions.
In summary, C17200 beryllium copper's tailored composition and enhanced properties make it indispensable for advanced engineering applications. Its versatility and performance underpin innovations across multiple industries, ensuring efficiency and safety.
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