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Detailed size range
Wire diameter:
Standard range: 0.01mm to 0.60mm, specific specifications are divided according to application requirements.
High-precision applications: For example, the diameter of the micro connector wire spring jack can be refined to 0.03mm to 0.09mm, and the allowable deviation is strictly controlled within -0.003mm.
Regular supply: Common specifications of commercial wire are 0.05mm to 1.0mm, and they are supplied in coils or reels.
International standards
Material standards:
ASTM B197: Copper-beryllium alloy wire standard developed by the American Society for Testing and Materials, covering the chemical composition and mechanical property requirements of C17200.
GB/T 5231: Chinese national standard, which stipulates that the chemical composition of C17200 is consistent with ASTM B197.
YS/T XXX: China's nonferrous metal industry standard, which specifies the marking method (such as "YS/T XXX-C17200 TD03-0.03") and technical indicators of C17200 beryllium copper wire for connectors.
Performance standards:
Tensile strength: The strength of wire in TD03 state is 931-934.5MPa (diameter 0.01-0.20mm), and the strength of wire in TH03 state is higher.
Conductivity: The conductivity of TH03 state is ≥23% IACS, and that of other states is ≥17% IACS.
Chemical composition: Beryllium (Be) content is 1.85-2.1%, nickel (Ni) is 0.2-0.4%, copper (Cu) is the remainder, and the total amount of impurities is ≤0.5%.
Chemical composition (weight percentage)
Core elements:
Beryllium (Be): 1.80-2.15%
Cobalt (Co): 0.35-0.65%, or ≥0.20% when combined with nickel.
Nickel (Ni): 0.20-0.25%, or ≤0.6% when combined with cobalt.
Copper (Cu): Remainder, usually ≥99.5%.
Impurity limits:
Silicon (Si), iron (Fe), aluminum (Al) are all ≤0.15%.
Titanium (Ti): 0.10-0.25%
The performance indicators are significantly affected by the heat treatment state, mainly divided into age-hardened state and annealed state:
Age-hardened state (high-strength state):
Tensile strength: 1105-1520 MPa, up to 1520 MPa (220 ksi).
Yield strength (0.2% offset): 1035-1345 MPa.
Hardness: 38-44 HRC, up to HRC 45 after peak aging.
Elongation: 1-2%, low elongation is associated with high strength.
Annealed or soft state:
Tensile strength: 590-830 MPa.
Elongation: up to 24%.
Other key properties:
Elastic modulus: 128-185 GPa, different literatures have different values due to different test methods.
Fatigue limit: equivalent to special steel, with high fatigue resistance.
Impact toughness: at least 32 J.
Physical properties
Density: 8.25-8.36 g/cm³.
Thermal conductivity: 105 W/(m·K) (20℃), some literature gives higher values (324 W/(m·℃), the unit or test conditions may be different).
Electrical conductivity: 18-22% IACS, high conductivity is one of its core advantages.
Thermal expansion coefficient: 17-24.3×10⁻⁶/℃.
Production process and product advantages of C17200 copper wire:
1. Production process
Alloy preparation and forming
C17200 is a precipitation-strengthened beryllium copper alloy (beryllium content 1.8-2.1%), and its production process includes:
Hot processing: Preliminary forming by hot extrusion, hot rolling or forging, suitable for processing of complex shapes.
Cold processing: Cold forming processes such as cold rolling, stamping, bending, etc. can further improve the strength of the material.
Heat treatment process
Solution treatment: Solution treatment at 760-790°C to evenly distribute the alloy elements and improve processing performance.
Aging treatment: Aging treatment at 260-426°C to precipitate γ' strengthening phase, significantly improve hardness (>320HV) and tensile strength (up to 1400MPa).
Precision processing and quality control
Beryllium copper wire for connectors needs to strictly control diameter deviation (such as ±0.003mm) and mechanical property consistency to ensure plug-in life.
It adopts precision welding technologies such as electron beam welding and laser welding, and is suitable for high-pressure or vacuum environment components.
2. Product advantages
Excellent mechanical properties
High strength and high elasticity: tensile strength can reach 1400MPa, yield strength 1195MPa (after aging), far exceeding materials such as phosphor bronze, and is called the "king of elasticity".
High hardness and wear resistance: hardness reaches HRC 38-45, suitable for high-stress parts such as springs and mold inserts.
Excellent physical and chemical properties
Electrical and thermal conductivity: electrical conductivity 18-23% IACS, thermal conductivity 105W/m·K, suitable for electrical connectors and heat dissipation components.
Corrosion resistance: high stability in fresh water, sea water and dilute acid, but strong corrosive environments such as ammonia and nitric acid should be avoided.
Non-magnetic and spark-resistant: collision does not produce sparks, suitable for explosion-proof tools and precision instruments.
Processing and use advantages
Process compatibility: supports a variety of forming methods (stamping, stretching, welding), and the cutting performance can be improved after aging treatment.
Dimensional stability: High-precision beryllium copper wire (diameter 0.01-0.60mm) is used for micro connectors. A diameter deviation of 0.01mm can significantly affect the pin stiffness (up to 26%).
Wide application areas
Electronics and communications: micromotor brushes, 5G connectors, wire spring jacks, etc., to ensure plug-in life and signal stability.
Aerospace and automotive: navigation instruments, high thermal conductivity bearings, electric vehicle components, to adapt to extreme temperatures and high reliability requirements.
Mold manufacturing: injection mold inserts, hot runner nozzles, with both rapid cooling and wear resistance.
Q1:Do you provide samples? Is it free or extra?
A1:Yes, we can provide samples free of charge and the customer will pay the freight.
Q2:What if I don't have export experience ?
A2:We have reliable forwarder agent which can ship items to you by sea/air/Express to your doorstep. Any way, we will help you choose the most suitable shipping service.
Q3:How long is your lead time?
A3:If it is in stock, it is usually 5-10 days. Or, if there is no inventory, 15 days, depending on the quantity.
Q4:What are your terms of payment?
A4:30% T/T deposit in advance, 70% T/T balance within 5 days after B/L copy, 100%.Irrevocable L/C at sight, 100% Irrevocable L/C after receive B/L 30-120 days, O/A.
Q5:How is your technical support?
A5:We provide lifetime online support through Whatsapp/ Skype/ Wechat/ Email. Any problem after delivery, we will offer you call anytime.
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