C14700 Copper Alloy

C14700 copper alloy is a high-performance copper based alloy widely used in industrial fields due to its excellent mechanical properties, corrosion resistance, and conductivity. This alloy belongs to precipitation hardening copper alloy, which can significantly improve strength through specific heat treatment processes while maintaining good ductility and toughness.

 

C14700 also is a sulfur-bearing copper alloy known for its excellent combination of high electrical conductivity and superior machinability . It belongs to the "free-machining copper" family, where sulfur is intentionally added to act as a chip breaker during high-speed machining operations.

 

 

 

The main component of C14700 is high-purity copper (Cu ≥ 99.5%), with trace amounts of sulfur (S) added as a free cutting element. The typical components are as follows:

• Copper (Cu): ≥ 99.5%
• Sulfur (S): 0.2%~0.5%
• Other impurities: ≤ 0.1% (such as lead, iron, etc.)

The addition of sulfur significantly improves the cutting performance of the material while maintaining the conductivity of copper above 90% IACS, making it suitable for scenarios that require a balance between processing efficiency and electrical performance.

• Conductivity: C14700 copper alloy maintains a conductivity of over 90% of pure copper, indicating its excellent conductivity and suitability for electrical and electronic applications.
• Thermal conductivity: This alloy also exhibits excellent thermal conductivity, facilitating rapid heat transfer.
• Strength: Tensile strength: ≥ 250 MPa (hard state) This alloy has high strength, reaching over 300 megapascals. After aging strengthening, the strength can be further increased to 400-550 megapascals.
• Elongation rate: ≥ 10% (annealed state)
• Hardness: HB 60~100 (adjustable)
• Corrosion resistance: The addition of sulfur makes C14700 copper alloy exhibit good corrosion resistance in environments containing ammonia, hydrogen sulfide, and other corrosive gases.

Machinability

• Cold Working and Hot Working: C14700 (KS2) high-conductivity copper alloy exhibits excellent performance in both cold and hot working processes, making it easy to machine and weld, and capable of meeting the requirements for various complex shapes and dimensions.
• Formability: The alloy exhibits excellent formability and can be processed and shaped through various methods, including rolling, stretching, forging, and more

 

 

Adopting the vacuum melting continuous casting and rolling process, the nanoscale uniform distribution of sulfur particles is achieved through precise sulfur control technology. After multiple cold rolling processes, bright annealing is used to eliminate internal stress, and precision straightening is used to ensure a dimensional tolerance of ± 0.02mm.

 

 

Form	Typical Availability
Rod / Bar	Round, hex, square; various diameters
Wire	Various gauges
Custom Shapes	Per customer specifications

 

Copper rod: available in various diameters (such as Φ 5mm~Φ 100mm), supporting customized lengths, suitable for machining such as turning and milling.
Copper plate: thickness range of 0.5mm~50mm, width up to 600mm, surface can be provided with rolled or polished treatment.

 

 

Alloy	Machinability	Conductivity (% IACS)	Key Difference
C14700 (Sulfur Copper)	85%	85-96%	Lowest cost; sulfur addition
C14500 (Tellurium Copper)	85%	85-94%	Better hot workability
C17300 (Beryllium Copper)	60%	15-23%	Much higher strength

 

 

C14700 is primarily available as rod, bar, and wire – plate and sheet forms are less common

• The sulfur addition slightly reduces electrical conductivity compared to pure copper (from ~100% to 85-96% IACS)
• For applications requiring maximum electrical conductivity, pure copper (C11000) may be preferred
• For applications requiring even higher machinability with similar conductivity, leaded copper (C18700) may be considered, though environmental regulations increasingly restrict lead use

For specific size, temper, or quantity requirements, please provide your detailed specifications.

 

 

 

 

 

• Electrical and Electronics: C14700 (KS2) high conductivity copper alloy is mainly used to manufacture spring electrical contacts, lamps, plug-in electrical components, etc. with high conductivity and light load. Its excellent performance makes these devices more stable and reliable during operation, and also improves the overall performance and service life of the devices.
• Aerospace: In the aerospace field, the excellent physical and processing properties of this alloy make it an ideal material for manufacturing high-precision components.
• Automobile: In the automotive field, C14700 (KS2) high conductivity copper alloy is used to manufacture key components such as engines and transmission systems to improve the performance and reliability of automobiles.
• Other fields: This alloy also plays an important role in communication, computer and other fields, such as manufacturing connectors, connectors, etc.

 

According to Mordor Intelligence's forecast, the global high conductivity copper alloy market will experience a compound annual growth rate of 5.2% from 2023 to 2028.

 

With the acceleration of 5G base station construction (single base station copper consumption reaches 60kg), the upgrade of new energy vehicle three electric systems (single vehicle copper consumption increases to 83kg), and the trend towards precision in intelligent manufacturing equipment, the demand for C14700 applications in micro connectors, heat dissipation modules, micro motors, and other fields will continue to grow.

 

Under the promotion of environmental policies, its lead-free environmental characteristics are more in line with the RoHS 2.0 standard, gradually replacing traditional lead containing free cutting copper alloys.

 

 

Q1: What are the main components of C14700 Copper Alloy?
A: The main components of C14700 Copper Alloy are Copper (Cu) and Sulfur (S), with trace amounts of Phosphorus (P) added as a deoxidizer.Cu 99.4% – 99.9% (Remainder),S:0.20% – 0.50%,P:0.002% – 0.013% (Trace),Ag:≤ 0.1% (Trace)

 

Q2: Does the electrical conductivity of C14700 Copper Alloy decrease due to processing?
A: No, the electrical conductivity of C14700 copper alloy does not decrease due to processing. It remains stable regardless of the processing method or temper condition

 

Q3: What surface treatments is C14700 Copper Alloy suitable for?
A:C14700 copper alloy is well-suited for several standard surface treatments, largely due to its high copper content and ability to achieve a smooth surface finish. Support Electroplating, Coating (e.g., painting, lacquering),Brazing & Soldering etc.

 

Q4: How to distinguish C14700 Copper Alloy from copper chromium zirconium?
A: Identifying C14700 (sulfur copper) and Copper Chromium Zirconium (CuCrZr, also known as C18150) requires focusing on their distinct mechanical properties, heat resistance, and magnetic behavior. While both are high-conductivity copper alloys, they are engineered for completely different applications.

 

Q5: What is the corrosion resistance of C14700 Copper Alloy?
A: C14700 copper alloy is widely recognized for having good to excellent corrosion resistance, making it a strong choice for applications in challenging environments.

 

Q6: What parameters are required when ordering C14700 Copper Alloy?
A: It is necessary to specify the alloy grade (such as C14700), Product Form & Dimensions,Mechanical Properties,Physical Properties, Temper Condition, Surface Finish,dimensional tolerance and testing standard (ASTM/GB).

 

 

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