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Dimensional Specifications for C65620 Rods
C65620 rods are typically supplied as solid round bars with tolerances and dimensions adhering to general copper alloy standards. Critical parameters include:
Diameter and Tolerance
- Diameter Range: Commonly available in 2–100 mm, with forged rods extending up to 100 mm and drawn rods as thin as 0.8 mm .
- Tolerances:
- Standard Round Rods:
- Diameter ≤20 mm: ±0.1 mm
- 20 mm < Diameter ≤52 mm: ±0.2 mm
- Diameter >52 mm: ±0.3 mm .
- Precision-Ground Rods: Tighter tolerances (e.g., ±0.1 mm for diameters ≤60 mm) for high-accuracy applications .
Length and Straightness
- Length Range: Up to 2,500 mm for forged rods, with standard lengths often capped at 800–1,500 mm .
- Straightness Tolerance:
- For rods ≥10 mm diameter and ≥1,000 mm length: Maximum curvature deviation of 1.5 mm/m .
Form and Roundness
Deviation from Circularity: Must not exceed 50% of the diameter tolerance (e.g., ±0.05 mm for a ±0.1 mm diameter tolerance) .
Key International Standards
C65620 complies with the following standards, ensuring material consistency and performance:
Material and Composition Standards
- AMS 4616: Directly specifies C65620’s chemical composition, mechanical properties, and processing requirements for aerospace applications .
- ASTM B249: Covers general requirements for copper alloy rods, including dimensional tolerances and testing protocols .
Dimensional and Tolerance Standards
- EN 12163/EN 12164: European standards for copper alloy rods, defining diameter, straightness, and length tolerances for free-machining and general-purpose applications .
- JIS H 3250: Japanese Industrial Standard for copper alloy rods, specifying mechanical properties, preferred dimensions, and roundness limits .
- EN 13601: Addresses electrical-purpose copper rods, relevant for C65620’s use in conductive components (e.g., waveguides, busbars) .
Specialized Performance Standards
- MIL-T-16420: U.S. military specifications for high-strength copper alloys in defense systems, aligning with C65620’s aerospace applications .
Chemical Composition
C65620 (UNS designation) is a high-strength silicon bronze alloy primarily composed of copper (Cu) with controlled additions of silicon (Si), iron (Fe), and zinc (Zn). Based on its designation and metallurgical behavior, the approximate chemical composition is as follows:
- Copper (Cu): Balance (primary constituent, ensuring electrical conductivity and corrosion resistance).
- Silicon (Si): ~3% (enhances strength, wear resistance, and contributes to self-lubricating properties).
- Iron (Fe): ~2% (improves mechanical strength and grain refinement).
- Zinc (Zn): ~3% (promotes phase stability and corrosion resistance).
Minor elements may include trace impurities (e.g., lead, phosphorus) within allowable limits, but the alloy is explicitly noted for being free of hazardous elements like lead (Pb) and beryllium (Be) in its refined form .
Mechanical Properties
C65620 exhibits a unique combination of strength, ductility, and wear resistance, making it suitable for demanding applications in aerospace, marine, and industrial sectors. Key mechanical properties include:
- Tensile Strength: ~450–600 MPa (dependent on processing conditions such as hot forging and annealing).
- Yield Strength: ~300–400 MPa (providing excellent load-bearing capacity).
- Elongation: >25% (exceptional ductility, enabling complex cold-forming operations without cracking).
- Hardness: ~150–200 HB (Brinell hardness, ensuring resistance to mechanical wear and galling).
- Fatigue Resistance: High cyclic load tolerance, ideal for components like bearing cages and fasteners.
- Non-Magnetic Properties: Critical for applications in sensitive electronic and aerospace systems.
- Corrosion Resistance: Moderate resistance to atmospheric and marine environments, though Zn-rich phases may slightly reduce performance in aggressive conditions.
Additional Characteristics
- Machinability: Excellent, with smooth chip formation and low tool wear, suitable for precision machining into components like ball bearing cages .
- Cold Workability: Superior elongation allows for intricate shaping without intermediate annealing.
- Environmental Safety: Compliant with eco-friendly standards due to the absence of toxic elements.
Production process and product advantages of C65620 copper rod:
Production process
As a high-strength silicon bronze alloy, the production process of C65620 copper rod combines the general process of copper alloy with the smelting control of specific alloy components:
Raw material processing and smelting: High-purity copper is used as the basic raw material, and alloy elements such as silicon and iron are added. The addition of iron can improve the strength of the alloy, while silicon gives the material self-lubricating properties. The smelting temperature is usually controlled at 1000℃–1100℃, and a slag remover (such as borax) is added to remove impurities to ensure the purity of the molten liquid.
Forming process: Continuous casting (such as upward continuous casting) or continuous extrusion technology is used to continuously form the molten copper into a rod blank through a crystallizer, and then it is pulled out and cut into a blank by a traction machine. Some processes are combined with rolling or stretching to further optimize the density and dimensional accuracy of the rod.
Subsequent processing: The blank rod is stretched, straightened, polished, etc. to improve the surface finish and straightness. Annealing treatment is performed when necessary to eliminate internal stress and improve mechanical properties.
Finishing and testing: After passing quality tests such as chemical analysis and hardness testing, it is cut into standard lengths and packaged.
Product advantages
C65620 copper rod has the following core advantages due to its unique alloy composition and process optimization:
High strength and wear resistance: The strengthening effect of iron elements enables the material to maintain the self-lubricating properties of silicon bronze while significantly improving the wear resistance and load performance, which is suitable for high-stress scenarios such as aviation valve components, missile rack connection devices, etc.
Excellent processing performance: It is easy to process into precision parts (such as ball bearing cages) through stamping, turning, stretching and other processes, and the surface can be polished or pickled to meet different needs.
High temperature and conductivity: The high conductivity of silicon bronze makes it suitable for electrical fields (such as waveguides, coaxial cables), and its high temperature resistance supports use in high-heat environments such as aircraft engines.
Environmental protection and efficient production: The use of short-process processes (such as continuous extrusion) reduces energy consumption, combined with the recycling of scrap copper, in line with the trend of green manufacturing.
Diversified application scenarios: from automotive rectifiers to marine ship bushings to precision instrument parts, its comprehensive performance covers multiple fields such as industry, military, and civil use.
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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