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The size range and international standards of C14500 copper strip/coil are as follows:
Size range
Thickness range:
According to the general copper strip specifications (such as copper strip for transformers), the thickness of C14500 copper strip is usually 0.075-5.00mm, and the common thickness in specific applications is 0.15-1.5mm.
The upper limit of the thickness of copper strip for cable is 0.80mm (according to the revision of Chinese national standards).
Width range:
The standard width is 8-1250mm
The width range of copper strip for cable is adjusted to 15-305mm.
Inner diameter of coil:
The inner diameter of the coil of copper coil is commonly 80-500mm (such as 80mm, 100mm, 150mm, etc.), depending on the supplier's specifications.
International standards
C14500 copper alloy complies with the following international and national standards:
ASTM standards:
ASTM B301/B301M (Specifications for drawn bars and rectangular bars).
ASTM B249 (General requirements for rolled bars).
Chinese standards:
GB/T 5231-2001 (processed copper and copper alloy grades).
GB4423, GB14955 (specific performance requirements).
Japanese standards:
JIS H3250 (standard for copper and copper alloy bars), corresponding to grade C1450.
European standards:
German DIN 17672, British BS 2874 (specifications for copper alloy bars and profiles).
ISO 1637 (general requirements for copper alloy processed materials).
Other countries:
Russian GOST 18175, French NF A51-101, etc.
Chemical composition (mass percentage)
Copper (Cu): ≥99.90%
Tellurium (Te): 0.40–0.70%
Phosphorus (P): 0.004–0.012%
Mechanical properties
Mechanical properties vary depending on the material state (such as annealed state, cold worked state):
General properties
Tensile strength:
Annealed state: 221–386 MPa
Cold worked state (H04 full hard state): 330–380 MPa
Some literatures mark the minimum value of 38 MPa as a typesetting error, which should actually be 380 MPa.
Yield strength:
Annealed state: 69–352 MPa
Cold worked state (H04): 260–340 MPa
Elongation:
Annealed state: ≥50%
Cold worked state (H04): 8–12%
Hardness:
Brinell hardness: 76 HB (annealed state)
Vickers hardness: 85–100 HV (cold worked state)
Shear strength: 170–190 MPa (H02 semi-hard state to H04 full hard state).
Physical properties
Density: 8.94 g/cm³ (20°C)
Melting point:
Liquidus: 1080°C (1976°F)
Solidus: 1051°C (1924°F)
Electrical conductivity: 93% IACS (annealed), drops to 85% IACS after cold working
Thermal conductivity: 355 W/(m·K) (20°C)
Coefficient of thermal expansion: 17.6×10⁻⁶/K (20–300°C)
Modulus of elasticity: 117 GPa
Key features
Processability:
Machinability rating is 85% (brass is 100% benchmark), far exceeding pure copper (20%).
Suitable for high-speed automatic lathe processing, with excellent cold heading and forging performance.
Electrical/thermal conductivity:
The electrical conductivity is close to pure copper (93% IACS), suitable for electrical connectors, welding electrodes, etc.
Corrosion resistance:
Resistant to hydrogen embrittlement in reducing atmosphere, suitable for furnace brazing.
C14500 copper strip/coil production process and product advantages:
1. Production process
Raw materials and alloying: Pure copper is used as the matrix, and 0.4%-0.7% tellurium (Te) and trace phosphorus (P) are added to form an alloy to improve cutting performance and conductivity.
Melting and processing:
Hot processing: Forming by extrusion, forging and other methods, such as continuous extrusion deformation and cooling of Φ20 copper rod to form a blank.
Cold processing: Including drawing, rolling, stamping and molding, etc., which can be made into a variety of profiles such as plates, strips, rods, wires, etc.
Heat treatment and sintering: Optimize material properties and enhance structural stability through high-temperature sintering (such as two sintering steps).
Surface treatment: Support polishing, electroplating and other processes to improve surface finish and functionality.
2. Product advantages
High electrical and thermal conductivity:
Electrical conductivity ≥85%IACS, high-quality materials can reach more than 95%, thermal conductivity 355W/(m·K), suitable for electrical components and heat dissipation scenarios.
Excellent cutting processability:
Tellurium element makes the chips easy to break, and the cutting efficiency score reaches 85%, reducing tool wear and maintenance costs.
Excellent mechanical properties:
Tensile strength ≥350MPa, hardness above HV120, elongation 8%-12%, with both high strength and ductility.
Environmental resistance:
Corrosion resistance and electrical ablation resistance, stable performance in acid, salt spray and arc environment, and extended service life.
Low temperature rise characteristics:
Low working temperature rise, reducing overheating risks, and improving system safety and reliability.
Wide processing adaptability:
Supports hot and cold processing (forging, casting, extrusion, etc.) and a variety of molding processes to meet the needs of complex parts.
Wide application fields:
Used in high-end fields such as new energy vehicle high-current connectors, electronic connectors, and welding and cutting equipment nozzles.
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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