Cold rolled pure copper plate
Cold-rolled pure copper sheet is a sheet product made from pure copper through a cold-rolling process. It exhibits excellent electrical and thermal conductivity, ductility, and corrosion resistance, making it an indispensable material for applications in electronics, electrical appliances, aerospace, architectural decoration, and other fields. While pure copper typically has a purity of over 99.5%, high-purity cold-rolled pure copper sheet can reach purity levels exceeding 99.9%. This results in excellent electrical conductivity, approaching the theoretical value for pure copper, making it an ideal choice for manufacturing conductive components. The cold-rolling process not only achieves precise thickness and uniform microstructure, but also enhances strength and hardness through work hardening, while maintaining excellent plasticity to meet the requirements of various processing methods, such as stamping, bending, and shearing.
The production process of cold-rolled pure copper sheet is complex and requires stringent technical requirements. It primarily involves smelting, ingot casting, hot rolling, cold rolling, annealing, and surface treatment. First, raw materials, including electrolytic copper, are placed in a furnace for smelting. The smelting temperature and time are strictly controlled to ensure the purity and uniformity of the molten copper and remove impurities and gases. After smelting, the molten copper is cast into ingots, which undergo a homogenization annealing treatment to eliminate internal stresses and structural defects, preparing them for subsequent rolling. The ingots are first hot-rolled to a desired thickness. During the hot-rolling process, the rolling temperature and reduction must be carefully controlled to avoid defects such as cracks. The hot-rolled sheet then enters the cold-rolling process, where the sheet thickness is gradually reduced to the desired size through multiple cold-rolling passes. The reduction in each cold-rolling pass must be carefully controlled to ensure dimensional accuracy and surface quality. Work hardening occurs during the cold-rolling process, necessitating intermediate annealing to restore the material’s plasticity and ensure a smooth cold-rolling process. Finally, the cold-rolled pure copper plate is subjected to finished product annealing, surface cleaning and quality inspection to ensure that its performance and appearance meet the standard requirements.
Cold-rolled pure copper sheet is widely used in the electronics and electrical industry and is a key material for making various conductive and thermally conductive components. In the electronics field, high-purity cold-rolled pure copper sheet is used to make lead frames and printed circuit boards for integrated circuits. Its excellent electrical conductivity ensures the rapid transmission of electronic signals, while its good thermal conductivity helps dissipate heat from the chip, improving the operational stability of electronic equipment. In the electrical industry, cold-rolled pure copper sheet is used to make windings, conductive bars and other components for transformers and motors. For example, the iron core of a transformer usually uses cold-rolled pure copper sheet as a conductive winding. Its high conductivity can reduce energy loss and improve the efficiency of the transformer. In addition, in the wire and cable industry, cold-rolled pure copper sheet can be made into copper wire through drawing and other processes, which is used to make conductors for wires and cables to meet the electrical conductivity needs of different occasions.
Cold-rolled pure copper sheet also plays an important role in the aerospace and architectural decoration fields. In the aerospace field, cold-rolled pure copper sheet is used to manufacture electrical system components and heat exchangers for aircraft and spacecraft due to its excellent electrical conductivity, thermal conductivity, and corrosion resistance. For example, cold-rolled pure copper sheet is used to manufacture heat sinks in aircraft engine cooling systems. Its excellent thermal conductivity quickly dissipates heat generated by the engine, ensuring its normal operation. In the field of architectural decoration, cold-rolled pure copper sheet is used to manufacture decorative components such as building roofs, walls, and curtain walls due to its unique metallic luster and good corrosion resistance. For example, the roofs of some high-end buildings are paved with cold-rolled pure copper sheet, which is not only beautiful and elegant, but also has a long service life. Over time, a dense oxide film will form on the surface of the copper sheet, presenting a simple patina and adding a more artistic touch.
With the continuous advancement of science and technology and the rapid development of industry, higher requirements are being placed on the performance and quality of cold-rolled pure copper sheet, driving continuous innovation in its production technology. To improve the strength and wear resistance of cold-rolled pure copper sheet, manufacturers are developing novel rolling processes, such as asynchronous rolling and cold rolling-annealing composite processes, to refine the grain structure and enhance the material’s mechanical properties. Regarding purity control, advanced melting and refining technologies are being employed to further reduce impurity levels in pure copper and improve its conductivity to meet the demands of high-end electronics. Furthermore, to meet the requirements of environmental protection and sustainable development, manufacturers are continuously optimizing production processes to reduce energy consumption and pollutant emissions and increase copper recovery rates. In the future, with the development of industries such as new energy, 5G communications, and high-end equipment manufacturing, market demand for cold-rolled pure copper sheet will continue to grow, and its application areas will continue to expand, providing strong material support for the development of various industries.
