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Detailed size range
Standard size range of C17200 copper rod:
Diameter range:
Conventional rods: 3 mm to 300 mm, some suppliers can provide bright rods with smaller diameters (such as 1.5 mm) or annealed black rods with larger diameters (such as 320 mm).
Custom rods: Some manufacturers support customized rods with diameters of 1.0 mm to 200 mm.
Length range:
Standard lengths of straight bars are usually 500 mm to 5000 mm, and some suppliers provide cutting services to meet specific needs.
International standards
The production and inspection of C17200 copper rods follow the following international standards:
ASTM B196/B196M:
Core standard, which specifies the chemical composition, mechanical properties, heat treatment requirements, etc. of copper-beryllium alloy rods.
Covering three alloys (C17000, C17200, C17300), the default alloy is C17200.
ASTM B194:
Supplementary standard covering copper-beryllium alloy sheet and strip, with some performance requirements related to bars.
SAE J463:
Standard for processing and application of copper alloy materials, complementary to ASTM standards.
ISO standard
ISO 428 (drawn bars of copper and copper alloys)
Dimensional tolerances refer to ISO 1829 (h11 grade precision tolerances).
Hardness requirements: Aged state HV 350-420 (≈HRC 37-42).
EN standard
EN 12163:2016 (copper and copper alloy bars)
Grade: CuBe2 (equivalent to C17200).
Elongation requirement: Aged state ≥5% (gauge length 50mm)
JIS standard
JIS H3270 (beryllium copper rod and wire)
Grade: C1720, Be content 1.6-2.0%.
Aging hardness: HRC 36-42 (TH04 state).
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/℃.
The production process and product advantages of C17200 beryllium copper rod can be analyzed based on multiple pieces of evidence as follows:
Production process:
Hot processing performance
C17200 alloy has superplasticity in the temperature range of 530-500℃, and can be hot extruded, hot rolled and forged. The hot-processed material can obtain a uniform supersaturated solid solution through solution treatment (such as 930℃ softening temperature).
Cold processing performance
Under quenching and intermediate softening annealing, the alloy has excellent cold processing performance, and the total processing rate can reach more than 50%, supporting cold rolling, stamping, bending, spinning and other processes. Cold drawing treatment further improves the strength and dimensional accuracy of the material.
Aging treatment
After aging treatment at 320℃, the alloy undergoes amplitude modulation decomposition and γ′ phase precipitation, significantly improving hardness and conductivity. The typical aging process is 320℃ insulation for 1 hour, which makes the tensile strength reach 1105MPa and the hardness reach HRC 38-44.
Welding and Forming
The alloy is easy to braze and melt weld (such as laser welding and electron beam welding), and supports precision processing (such as drilling, turning, bending), and can manufacture parts with complex shapes.
Product advantages:
High strength and high hardness
C17200 is one of the strongest materials among all copper alloys, with a tensile strength of 1105MPa, a yield strength of 1035MPa, and a hardness of HRC 38-44, far exceeding ordinary copper alloys. Its fatigue strength, wear resistance and creep resistance are close to the level of special steels.
Excellent electrical and thermal conductivity
The electrical conductivity is 18-24% IACS, and the thermal conductivity is 105W/m·K, which is 2-3 times higher than that of steel. It is suitable for molds and electronic components with rapid heat dissipation.
Corrosion resistance
It has high chemical stability in the atmosphere, fresh water, seawater and organic acids (such as dilute hydrochloric acid and acetic acid), and has a low tendency to intergranular corrosion, but it needs to avoid contact with moist ammonia or nitric acid solutions.
Special functional characteristics
Non-magnetic and spark-free: suitable for explosion-proof tools such as oil and mining.
Anti-adhesion: Reduce material adhesion in the mold and extend service life.
High dimensional stability: high surface accuracy after polishing, suitable for precision molds and mirror processing.
Wide processing adaptability
Supports a variety of processes such as hot/cold processing, welding, and EDM, with various supply forms (bars, plates, pipes, etc.), and specifications covering diameters from 1mm to 300mm to meet customized needs.
Main application areas:
Mold manufacturing: injection mold inserts, hot runner systems, injection heads, etc., significantly shortening the injection cycle.
Electronic appliances: connectors, relays, antenna shrapnel, etc., with both conductivity and fatigue resistance.
Explosion-proof tools: oil equipment, mining tools, using their spark-free characteristics to improve safety.
Marine engineering: corrosion-resistant parts such as submarine cable repeaters.
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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