In the copper processing industry, copper coils are a key intermediate product connecting copper smelting and downstream end-use manufacturing. Existing in continuous roll form, they combine copper's natural properties (electrical conductivity, thermal conductivity, and ductility) with the processing advantages of coils (continuous production and low loss). Through processes such as slitting, flattening, stamping, and stretching, they can be transformed into end-use materials such as copper strips, copper sheets, copper foil, and custom-shaped parts. From precision conductive components in electronic devices to artistic panels for architectural decoration, from efficient automotive heat dissipation components to antibacterial medical devices, copper coils, with their advantages of "bulk supply, efficient conversion, and controllable performance," have become a core raw material supporting modern manufacturing and consumer goods, serving as a "value converter" within the copper processing industry chain. I. Basic Understanding of Copper Coil: Definition, Production Process, and Core Characteristics
1. Definition and Form Characteristics
Copper coil, also known as "copper and copper alloy coil," is made from electrolytic copper (purity ≥99.95%) or copper alloy ingots. After continuous hot rolling, cold rolling, and annealing, it is wound into a long coil (a single coil can reach hundreds of meters in length, typically 300mm-2000mm wide, and weigh 5-30 tons). Its core form advantage lies in its "continuous" nature. Compared to single copper sheets, copper coils can be adapted for automated continuous processing lines (such as continuous slitting and continuous stamping), significantly improving production efficiency (by over 40%) and reducing scrap waste (scrap rates down to less than 2%). It also meets the manufacturing needs of large-scale end products (such as wide-width architectural decorative panels and automotive battery foil substrates). 2. Core Production Process
Copper coil production involves three major steps: melting, rolling, and finishing. Based on downstream demand, the process is divided into two main paths: hot-rolled and cold-rolled. The differences between the two directly determine the copper coil's precision and application scenarios:

Hot-rolled copper coil production: Electrolytic copper or copper alloy ingots are first melted in a reverberatory or induction furnace (pure copper melting temperature is approximately 1083°C) and cast into copper billets with a thickness of 100-300mm. The billets are then heated to 800-900°C (the recrystallization temperature range for copper) and rolled into thick plates with a thickness of 10-30mm in a roughing mill. The plates are then further thinned to 2-12mm in a finishing mill before being coiled on a coiler to form hot-rolled copper coil. This process offers short production cycles and low costs, making it suitable for producing thick copper coils with low precision requirements. Cold-rolled copper coil production uses hot-rolled copper coil as the base material. It undergoes pickling (to remove the oxide scale on the hot-rolled surface, preventing it from interfering with subsequent processing). It then passes through a cold rolling mill multiple times at room temperature (cold rolling deformation can reach 50%-80%), reducing the thickness to 0.1-3mm (ultra-thin specifications can reach 0.01mm, close to copper foil). During the rolling process, it undergoes multiple annealing steps (pure copper annealing temperature 350-400°C) to eliminate cold-rolling internal stresses and restore plasticity. Finally, it passes through a flattening mill to adjust the surface finish and shape before being coiled into cold-rolled copper coil. This process improves the copper coil's dimensional accuracy (thickness tolerance ±0.005mm) and surface quality, making it a core raw material for high-end manufacturing. 3. Core Characteristics: Copper's Natural Advantages and Coil Processing Capabilities
The performance of copper coils is essentially a combination of copper's metallic properties and the rolling process, making them irreplaceable in a wide range of applications:

Excellent Electrical and Thermal Conductivity: Pure copper coils have electrical conductivity (58 S/m at 20°C) and thermal conductivity (386 W/(m・K)), second only to silver. Cold-rolled pure copper coils (such as T2 grade) are the preferred choice for electrical and thermal conductivity in the electronics and power sectors. Applications such as copper foil substrates for circuit boards and heat sinks rely on this property.

Excellent Ductility: Copper can be easily stretched and bent at room temperature. Cold-rolled copper coils can achieve an elongation of over 40%, allowing them to be stamped into complex, custom-shaped parts (such as automotive connector clips and medical catheters) without cracking.

Natural Antibacterial Properties: Copper ions can destroy bacterial cell membranes. Pure copper and brass coils have an antibacterial rate of over 99% against Escherichia coli and Staphylococcus aureus, making them suitable for hygiene-sensitive applications such as medical and food applications.

Processing Flexibility: The coiled form allows for "One-shot rolling, multiple processing steps" allows for slitting into narrow strips (up to 5mm in width), flattening into flat sheets, and direct continuous stamping, meeting the full range of manufacturing needs, from micro-components to large structural parts.

Recyclability: The copper recycling rate exceeds 95%, and scrap copper coils can be remelted into new coils without loss of performance, aligning with the "dual carbon" and sustainable development trends.

II. Core Classification of Copper Coil: Classification by Process, Composition, and Surface Condition

Copper coil classification must be centered around three key dimensions: "production process," "alloy composition," and "surface condition." Different categories vary significantly in performance, cost, and application scenarios, directly determining downstream processing options and end-user compatibility. 1. Classification by rolling process: hot-rolled copper coil vs. cold-rolled copper coil
This is the most core classification of copper coils, covering almost all application scenarios. The performance differences brought about by process differences are as follows:
(1) Hot-rolled copper coil
Specifications: thickness 2-12mm (some thick specifications can reach 20mm), width 500-2000mm, surface roughness Ra 1.6-6.3μm (with oxide scale, need to be pickled before use);
Performance characteristics: high strength (pure copper hot-rolled coil tensile strength is about 220MPa), medium plasticity, corrosion resistance is slightly weak due to surface oxide scale, suitable for heavy processing (such as welding and forging after cutting);
Cost and efficiency: short production process, cost is 35%-55% lower than cold-rolled coil of the same material, large output (accounting for 30% of the total copper coil output) Suitable for bulk supply of large-scale projects.
Typical Applications: Thick copper plate for architectural decoration (such as brass curtain wall base), structural blanks for mechanical manufacturing (such as copper alloy gear bases), and thick-walled copper tubes for large heat exchangers.
Limitations: Low dimensional accuracy (thickness tolerance ±0.1mm) and rough surface make it unsuitable for precision electronics or decorative applications. (2) Cold-rolled copper coil
Specifications: Thickness 0.1-3mm (ultra-thin specifications 0.01-0.1mm, called "thin copper coil", close to copper foil), width 300-2000mm, surface roughness Ra 0.1-1.6μm (can be processed into a mirror finish);
Performance characteristics: high dimensional accuracy (thickness tolerance ±0.005mm), smooth surface, excellent ductility (elongation ≥40%), hardness can be adjusted by annealing after cold rolling (soft, semi-hard, hard), adaptable to different processing requirements;
Cost and efficiency: The production process is long (requires multiple cold rolling + annealing), the cost is high, but the processing yield is high (≥95%), and it is the main raw material for high-end manufacturing (accounting for 10% of the total copper coil production). 70%;
Typical Applications: Electronics (circuit board copper foil substrate, connector shrapnel raw materials), precision instruments (medical scalpel handles, watch cases), and decoration (mirror brass ceilings, high-end home appliance panels).
Advantageous Applications: Applications requiring precision machining, high surface quality, or complex forming, such as stamping materials for mobile phone midframes and tab substrates for new energy vehicle batteries. 2. Classification by alloy composition: pure copper coil and alloy copper coil
Composition difference is the core determinant of copper coil performance. Different alloy copper coils precisely match the functional requirements of different fields:
(1) Pure copper coil (red copper coil)
Composition: Copper purity ≥99.5%, common grades are T2 (purity 99.90%, general type), T1 (purity 99.95%, high purity), TP2 (phosphorus deoxidized copper, no pores when welded);
Performance characteristics: optimal electrical and thermal conductivity (T2 conductivity 57S/m), good ductility, good weldability, but low strength (soft state T2 tensile strength is about 190MPa), medium corrosion resistance (easy to corrode in strong acid);
Typical applications: electronics and electrical (circuit board copper foil substrate, transformer busbar raw materials), thermal conductive components (CPU Radiator materials, heat exchanger copper tube base material), medical food (infusion tube materials, food equipment liner base material);

Suitable applications: Applications requiring efficient electrical and thermal conductivity, hygienic safety, or precision welding, such as wiring harness materials for new energy vehicles and air conditioning refrigeration tube base material (TP2 cold-rolled coil). (2) Brass Coil
Composition: Copper + Zinc (Zn content 10%-45%), some contain lead (Pb, such as H62Pb, to improve machinability), common grades H62 (Cu62%, Zn38%, general purpose), H65 (Cu65%, Zn35%, high plasticity);
Performance characteristics: lower cost than pure copper coil (zinc price is only 1/5 of copper), higher strength (H62 tensile strength is about 300MPa), easy to cut and polish, but electrical and thermal conductivity is only 40%-60% of pure copper, poor resistance to seawater/ammonia corrosion;
Typical applications: architectural decoration (brass curtain wall, furniture handle raw materials), machinery manufacturing (valve spool, bearing bushing raw materials), daily necessities (brass tableware, lamp base raw materials);
Applicable scenarios: cost-sensitive scenarios that require medium strength or decorative features, such as decorative panel raw materials for ordinary home appliances (H65 cold-rolled coil). (3) Bronze Coil
Composition: Copper + Tin (Sn, such as QSn4-3, Tin Bronze), Copper + Aluminum (Al, such as QAl9-4, Aluminum Bronze), Copper + Silicon (Si, such as QSi3-1, Silicon Bronze), does not contain zinc;
Performance characteristics:
Tin Bronze Coil: Excellent wear resistance and fatigue resistance (the wear rate of QSn4-3 is only 1/3 of pure copper), suitable for reciprocating friction scenarios;
Aluminum Bronze Coil: High strength (QAl9-4 tensile strength ≥600MPa), strong corrosion resistance (can withstand seawater and weak acid), is a representative of "high-strength corrosion-resistant copper alloy";
Typical applications: Aerospace (aircraft landing gear bushing materials, engine bearing substrates), marine engineering (ship propeller materials, seawater valve substrates), precision machinery (machine tool guide rail materials);
Applicable scenarios: Severe industrial scenarios with wear resistance, high pressure, and strong corrosion, such as the stirring shaft material of chemical reactors (aluminum bronze hot-rolled coils). (4) White copper coil (copper-nickel alloy coil)
Composition: Copper + nickel (Ni content 10%-50%), some contain Fe and Mn (such as BFe10-1-1, to improve strength), common grades B10 (Cu90%, Ni10%), B30 (Cu70%, Ni30%);
Performance characteristics: extremely strong corrosion resistance (especially resistant to seawater, chlorine, and organic acid corrosion), good low-temperature toughness (no brittle cracking at -196℃), silvery white appearance (good decorative effect), but high cost (nickel price is 3-4 times that of copper);
Typical applications: marine engineering (seawater cooler tube sheet raw materials, marine platform guardrail base materials), chemical industry (acid and alkali storage tank lining raw materials, chlorine gas transmission pipeline base materials), high-end decoration (luxury product packaging box raw materials, hotel wall decoration panels);
Applicable scenarios: strong corrosion, low temperature or high-end decoration scenarios, it is the "corrosion resistance first choice" that cannot be replaced by other copper coils, such as the acid and alkali transmission pipe raw materials of nuclear power plants (B30 cold-rolled coil). 3. Classification by Surface Condition: Determines the appearance and functionality of the end product.
The surface condition of copper coil directly impacts the aesthetics and usage scenarios of downstream products. Common types and characteristics are as follows:

Pickled Surface: The surface of hot-rolled copper coil, after pickling to remove scale, is off-white with a roughness of Ra 1.6-6.3μm. It is suitable for subsequent processing such as welding and painting, but is not directly used for decoration.

2B Surface: After cold rolling, annealing, and flattening, it has a matte finish with a roughness of Ra 0.4-1.6μm. This is the most versatile surface, suitable for appliance housings and equipment linings.

Mirror Finish (BA Surface): After cold rolling, it is brightly annealed or polished, achieving a gloss of ≥800 GU (gloss units) and a roughness of Ra ≤0.1μm. It is suitable for high-end decoration (such as hotel walls and elevator cabins).

Brushed Surface: The surface is produced by a wire drawing machine on a 2B surface. The surface is processed to create parallel textures (straight and random) for both aesthetics and fingerprint resistance, making it suitable for furniture panels and electronic device casings.
Passivated Surface: Chemical passivation (such as chromate passivation) forms a protective film on the surface, improving corrosion resistance (extending salt spray test time by more than three times), making it suitable for copper coils used in outdoor decoration and marine engineering.

III. Core Advantages and Limitations of Copper Coil
The value of copper coil lies not only in the natural properties of copper, but also in the processing efficiency and adaptability brought by its "rolled form." However, it is also limited by cost and performance, and its scope of application requires objective evaluation. 1. Core Advantage: Irreplaceable Industrial Value
Irreplaceable Electrical and Thermal Conductivity: In the electronics and power sectors, pure copper coils offer superior electrical and thermal conductivity (second only to silver) that is unmatched by steel and aluminum coils. For example, copper foil for circuit boards and transformer busbars require pure copper coils, otherwise efficiency will be significantly reduced.
High Continuous Processing Efficiency: The coiled form adapts to automated production lines (such as continuous slitting, continuous stamping, and continuous electroplating). Compared to single copper sheets, processing time is reduced by over 50% and scrap waste is reduced by 80%, making it particularly suitable for mass production (such as large-scale production of mobile phone connectors).
Processing flexibility covers all scenarios: from hot-rolled coils as thick as 12mm (for structural components) to as thin as 0.01mm. Cold-rolled coils (for copper foil) range from pure copper coils (conductive) to cupronickel coils (corrosion-resistant). Copper coils can be formed using nearly any metalworking process, meeting the needs of a wide range of sectors, from consumer goods to high-end industry.

Combining functionality and aesthetics: The golden yellow of brass coils, the silvery white of cupronickel coils, and the purplish red of pure copper coils, when paired with mirrored or brushed finishes, can be used directly as decorative materials (such as building curtain walls and furniture panels) without the need for additional coating, ensuring both aesthetics and durability (a service life of 20-50 years).

Bacteriostatic properties make them suitable for specialized applications: The medical and food industries have extremely high hygiene requirements. Copper coils' natural antibacterial properties reduce bacterial growth (e.g., on medical device surfaces and in food processing equipment). They offer superior hygiene advantages over stainless steel coils and eliminate the risk of heavy metal leaching. 2. Major Limitations: Application Shortcomings to Be Avoided

Cost is significantly higher than traditional metal coils: Pure copper coils are 5-8 times more expensive than steel coils and 3-4 times more expensive than aluminum coils. Even the lower-cost brass coils are 2-3 times more expensive than galvanized steel coils. This leads some cost-sensitive applications (such as ordinary residential building exterior walls) to prefer lower-priced metal coils.

Insufficient Strength (Pure Copper Coil): The tensile strength of pure copper coils is only 190-220 MPa, far lower than that of steel coils (Q235 steel coils are approximately 190-220 MPa). 375MPa), making it unsuitable for load-bearing structural components (such as building beams). It requires alloying (e.g., bronze coils) or cladding (copper-steel composite coils) to enhance its strength.

Susceptible to oxidation and discoloration: Pure copper and brass coils are susceptible to oxidation in humid or high-temperature environments (pure copper turns green, brass turns black). While this does not affect mechanical properties, it can damage the decorative effect. Surface treatments such as passivation and painting are required to slow oxidation, adding additional costs.

Limited corrosion resistance: Pure copper and brass coils are susceptible to corrosion in strong acids (e.g., hydrochloric acid), seawater, and ammonia. Upgrading to bronze or white copper coils (with a 2-3 times increase in cost) will shorten their service life.

High density (inadequate lightweighting): Copper's density (8.96g/cm³) is three times that of aluminum and 1.1 times that of steel. In sectors such as aerospace and new energy vehicles, where lightweighting is paramount, the use of copper coils must be strictly controlled (for example, copper in new energy vehicles should only account for 1%-2% of the vehicle's weight) to avoid increasing overall weight.

IV. Typical Applications of Copper Coil: Empowering the Whole Chain from Raw Materials to End Users
Copper coil is a multi-purpose raw material carrier whose application requires "processing and transformation." Different types of copper coil correspond to different downstream sectors, forming a clear "raw material - processing - end user" chain.
1. Electrical and Electronics: Core raw material for electrical and thermal conductivity
Circuit Board Manufacturing: T2 cold-rolled thin copper coil (thickness 0.01-0.1mm) is electrolytically thinned into copper foil, which serves as the conductive layer of printed circuit boards (PCBs), supporting chip signal transmission.
Power Equipment: T2 hot-rolled copper coil is flattened and made into busbars for transformers and reactors, leveraging its high conductivity to reduce current loss. TP2 cold-rolled copper coil is drawn into air conditioning refrigeration tubing, suitable for high-pressure refrigerant transmission.
Electronic Components: H65 cold-rolled copper coil is stamped into connector springs (such as those for mobile phone charging ports), offering both electrical conductivity and elasticity. QSi3-1 silicon bronze coil is made into corrosion-resistant housings for electronic devices, protecting against corrosion caused by hand sweat. 2. Architectural Decoration: Combining Functionality and Aesthetics
Decorative Panels: H62 hot-rolled copper coils are flattened and polished to create brass curtain wall panels. B30 white copper cold-rolled coils are processed into mirrored decorative panels for hotel lobby walls and shopping mall counters, offering both corrosion resistance and a high-end finish.
Architectural Hardware: H62Pb brass coils are stripped and made into door handles and hinges. The lead content enhances machinability and facilitates processing into complex shapes. T2 pure copper coils are used to create roof gutters, extending their service life through corrosion resistance.
Artistic Decoration: T1 high-purity copper coils are etched and bent into sculptures and murals. Their purplish-red appearance combines artistic appeal with durability, making them suitable for public spaces such as museums and plazas. 3. Automotive and Transportation: Balancing Lightweight and Performance
Traditional Automobiles: H62 brass coils are used to make radiator cores, leveraging thermal conductivity to improve heat dissipation efficiency; QSn4-3 tin bronze coils are used to make bearing bushings, meeting the wear resistance requirements of high-speed engine operation;
New Energy Vehicles: T2 cold-rolled thin copper coils are used to make battery tabs (thickness 0.05-0.1mm), providing current conduction; B10 white copper coils are used to make battery cooling pipes, resistant to electrolyte corrosion;
Shipbuilding and Aviation: QAl9-4 aluminum bronze hot-rolled coils are used to make ship propellers, offering high strength and resistance to seawater corrosion; B30 white copper cold-rolled coils are used to make aircraft hydraulic system piping, offering excellent low-temperature toughness (no brittle cracking at -50°C). 4. Medical and Food Industries: The "First Line of Defense" for Health and Safety
Medical Devices: T2 cold-rolled copper coils are used to make surgical knife handles and sterilization equipment liners, offering natural antibacterial properties that reduce bacterial growth. Ultra-thin pure copper coils (0.03-0.05mm thick) are used to make medical catheters (such as gastroscopy catheters), offering excellent flexibility and biocompatibility.
Food Processing: TP2 cold-rolled copper coils are welded into food storage tanks and conveyor belts. They are resistant to acid and alkali corrosion (for juice and dairy products), easy to clean and disinfect, and meet food-grade standards (GB 4806.2).
Tableware: H65 cold-rolled copper coils are stretched into the copper core of stainless steel composite pot bottoms (improving thermal conductivity) or directly made into brass tableware, combining aesthetics with hygiene. 5. Machinery and Chemical Industry: Adapting to Wear and Corrosion Resistance Requirements
Machinery Manufacturing: QSn4-3 tin bronze hot-rolled coils are used in machine tool guides and gears, offering fatigue resistance. H62Pb brass coils are used in valve cores, offering easy cutting and excellent sealing.
Chemical Equipment: B30 white copper cold-rolled coils are used in acid and alkali storage tank linings and chlorine gas pipelines, offering resistance to highly corrosive media. QAl9-4 aluminum bronze coils are used in reactor agitator shafts, offering high strength and impact resistance, suitable for high-pressure applications.
Mold Manufacturing: T2 pure copper hot-rolled coils are used in mold heat sink inserts, leveraging their high thermal conductivity to quickly dissipate mold heat and improve molding efficiency.
V. Copper Coil Selection and Maintenance: Accurately Matching Requirements to Extend Raw Material Value
Copper coil selection directly determines the success rate of downstream processing and the quality of the end product. Maintenance, on the other hand, impacts the coil's storage life and processing performance. The following key points require special attention. 1. Core Selection Principles: Determine Suitable Copper Coil in Four Steps
Step 1: Identify Downstream Processing Methods and End-User Requirements
For precision stamping/drawing (e.g., electronic connectors, medical catheters): Choose cold-rolled copper coil (thickness 0.1-1mm), preferably pure copper coil (T2) or high-ductility brass coil (H65) for maximum ductility.
For welding/forging (e.g., mechanical structural parts, large pipelines): Choose hot-rolled copper coil (thickness 5-12mm), preferably bronze coil (QAl9-4) or brass coil (H62) for maximum strength.
For decorative applications (e.g., curtain walls, furniture panels): Choose cold-rolled copper coil (surface 2B/mirror), preferably brass coil (H62) or white copper coil (B30) for both aesthetics and corrosion resistance. Step 2: Confirm performance requirements (conductivity, corrosion resistance, and strength).
For applications requiring electrical and thermal conductivity (e.g., circuit boards and heat sinks): Choose pure copper coils (T2, TP2). The higher the purity, the better.
For applications requiring corrosion resistance (e.g., in seawater and chemical environments): Choose white copper coils (B10, B30) or aluminum bronze coils (QAl9-4).
For applications requiring strength and wear resistance (e.g., bearings and gears): Choose bronze coils (QSn4-3, QAl9-4).
For applications requiring cost (e.g., general decorative components and low-voltage components): Choose brass coils (H62), avoiding high-cost alloys. Step 3: Verify Standards and Quality
Common domestic standards: GB/T 2040 (pure copper and copper alloy sheets and strips, including copper coils), GB/T 13808 (brass sheets and strips), GB/T 2059 (copper and copper alloy strips);
Import standards: ASTM B152 (pure copper and copper alloy sheets and strips), ASTM B36 (brass sheets and strips), ASTM B140 (bronze sheets and strips);
Quality verification: Suppliers are required to provide a composition report (e.g., pure copper coil purity ≥ 99.90%), mechanical properties report (tensile strength, elongation), and surface quality report (free from scratches, oxidation, or pinholes).
Step 4: Consider the balance between processing cost and lifespan
For short-term use and low cost requirements: Choose H62 hot-rolled copper coil for simple processing and low cost.
For long-term use and high reliability requirements: Choose pure copper cold-rolled coil (T2) or white copper coil (B30). Although initially costly, they offer a long lifespan (20-50 years) and low long-term maintenance costs. 2. Storage and Maintenance Key Points: Avoiding Raw Material Loss
Transport Protection: Use dedicated coil transport racks (with non-slip mats) and separate copper coils with soft cloth to prevent collisions and surface scratches. Long-distance transportation requires covering with rainproof cloth to prevent rainwater from soaking and causing oxidation.
Storage Environment: Store in a dry, ventilated indoor warehouse, maintaining a temperature of 5-30°C and a relative humidity of ≤60%. Cold-rolled decorative copper coils (such as mirror-finish brass coils) should be sealed with plastic film and packaged with a desiccant (such as silica gel) to prevent moisture and dust.
Pre-Processing Inspection: Before use, inspect the copper coil surface for scratches, oxidation spots, and oil stains. Minor scratches can be repaired by polishing. Severe oxidation (e.g., incomplete pickling of hot-rolled coils) requires re-pickling before processing.
In-Process Protection: When stamping cold-rolled copper coils, apply a specialized copper lubricant (avoid using steel lubricants to prevent corrosion) between the die and the coil to prevent surface damage. Adjust the tool gap during slitting (typically 1.5 times the coil thickness). times), avoid excessive edge burrs (burrs ≤ 0.05mm).
Surface Maintenance (Decorative Coil): After processing, decorative copper coils can be coated with a clear varnish or a copper-specific care agent (such as copper oil) to delay oxidative discoloration. If green oxidative spots have appeared, gently sand with fine sandpaper and then apply a care agent to restore the gloss.

VI. Future Development Trends of Copper Coil: Adapting to High-End Manufacturing, Pushing the Boundaries of Performance
With the advancement of high-end manufacturing (such as chips and new energy) and the "dual carbon" goals, the copper coil industry is moving towards "high performance, functionality, low carbonization, and customization," further expanding its application boundaries. 1. High Performance: Adapting to the Demands of Strict Applications
Ultra-High Purity Copper Coil: Developing ultra-high purity copper coils with a purity of ≥99.999% for use in chip lead frames and superconducting materials, improving electrical stability (conductivity increased to over 59 S/m) and reducing signal loss.
High-Strength Copper Alloy Coil: Through microalloying (adding beryllium and titanium) and precision cold rolling, developing bronze and cupronickel coils with a tensile strength of ≥800 MPa. These coils are used in lightweight aerospace structural components (such as aircraft fuselage skins), reducing weight by over 25% compared to traditional copper coils.
Extreme Environment Resistant Copper Coil: Developing ultra-high temperature (above 500°C) resistant copper alloy coils (such as copper-chromium-zirconium alloy coils) for use in rocket engine heat sinks. Developing ultra-low temperature (-269°C) resistant cupronickel coils for use in superconducting equipment and liquefied natural gas (LNG) pipelines. 2. Functional Innovation: Empowering Copper Coils with New Properties
Antibacterial Enhanced Copper Coil: Silver and zinc are added to pure copper and brass coils to create copper coils with an antibacterial rate of ≥99.9%. These coils are used in medical implants (such as artificial joint surface materials) and decorative wall panels for food processing plants, further enhancing their hygienic advantages.
Self-Cleaning Copper Coil: A hydrophobic coating (such as a nano-silica coating) is applied to the surface of cold-rolled copper coils, creating a "self-cleaning" coil. Rainwater automatically washes away surface stains, eliminating the need for manual cleaning. These coils are suitable for building curtain walls and outdoor billboards.
Electrically Conductive and Thermally Enhanced Copper Coil: Graphene coating is applied to the surface of pure copper coils, improving thermal conductivity (over 30% higher than traditional pure copper coils). These coils are used in high-end chip heat sinks and battery cooling plates for new energy vehicles. 3. Low-Carbon Manufacturing: Responding to the Dual Carbon Goals
Short-Process Smelting-Rolling Integration: Promote the shortened process of "direct smelting of scrap copper - continuous rolling" to replace the traditional long process of "copper ore - electrolytic copper - rolling", reducing carbon emissions (the shortened process reduces carbon emissions by over 60% compared to the long process);
Green Processing: Develop acid-free passivation processes (such as chromium-free passivation) to replace traditional acid- and chromium-containing passivation processes, reducing pollutant emissions; Promote rolling waste heat recovery technology, using waste heat from cold and hot rolling for heating or power generation, reducing production energy consumption (energy consumption is reduced by 15%-20%);
Upgraded Recycling: Establish a closed-loop recycling system from "scrap copper coils to recycled copper coils". Using AI-powered intelligent sorting technology (which identifies the material and purity of the copper coils), this system improves recycling efficiency (recovery rate increased to 98%) and ensures that the performance of the recycled copper coils is consistent with that of the original coils (for example, the conductivity of recycled T2 copper coils is no less than 56S/m). 4. Customization and Precision: Meeting the Needs of Specific Applications
Ultra-thin Precision Custom Copper Coils: Targeting the needs of micro-components in electronics and medical applications, we offer customized ultra-thin copper coils with thicknesses of 0.005-0.01mm for applications such as microsensors and medical microcatheters, with a dimensional tolerance of ±0.001mm.
Customized Shaped Copper Coils: We develop custom-shaped products such as "asymmetric thickness copper coils" and "patterned copper coils" for applications such as special-shaped battery tabs for new energy vehicles and three-dimensional patterned panels for architectural decoration. This eliminates the need for downstream secondary processing and improves efficiency.
Integrated Solutions: We provide downstream companies with integrated services encompassing "copper coils + processing guidance + surface treatment." For example, we offer pre-painted copper coils to home appliance companies (eliminating the spray coating process) and pre-formed copper coils to electronics companies (eliminating the stamping and positioning process), shortening the supply chain cycle. Conclusion
Copper coils, as the "intermediate hub" of the copper processing industry chain, serve not only as a vehicle for the achievements of copper smelting technology but also as a valuable starting point for downstream end-use manufacturing. They transform copper's natural properties, such as electrical conductivity, thermal conductivity, and antibacterial properties, into a versatile raw material in a coiled form, supporting a wide range of products, from electronic chips to architectural decoration, from medical devices to aerospace. In the future, with the development of high-performance and functionalized copper coils and the advancement of low-carbon manufacturing, copper coils will continue to evolve towards greater precision, greener manufacturing, and greater functionality. They will not only become a solid foundation for high-end manufacturing but also provide crucial material support for sustainable development under the "dual carbon" goals.