Copper plate: a metal plate with both high functionality and decorative properties

Copper sheet is made from pure copper (≥99.5%) or copper alloys (with added elements such as zinc, tin, and nickel) through hot rolling, cold rolling, and annealing processes. Its core value lies in its "dual excellence in functionality and aesthetics"—it combines copper's excellent electrical conductivity, thermal conductivity, and ductility with the decorative texture of a metallic luster. It is widely used in electronics, heat dissipation, architectural decoration, and machinery manufacturing. It represents a mid- to high-end functional sheet material, distinct from carbon steel (which focuses on structural properties) and stainless steel (which focuses on corrosion resistance).

Based on its core properties, it can be further categorized into pure copper sheet and alloy copper sheet, depending on its material composition. Pure copper sheet (such as grades T2 and T3) contains ≥99.9% copper and offers excellent electrical and thermal conductivity (approximately 98% IACS, far exceeding carbon steel and stainless steel). However, this comes at the expense of lower strength and higher cost, making it suitable for applications requiring high electrical and thermal conductivity. Alloy copper sheet can be further categorized by composition: brass sheet (a copper-zinc alloy, such as H62, containing 62% copper) boasts greater strength than pure copper, is easier to process, and offers a reasonable cost, making it the most widely used type. Bronze sheet (a copper-tin alloy, such as QSn6.5-0.1) offers excellent wear and corrosion resistance, making it suitable for wear-resistant mechanical components. White copper sheet (a copper-nickel alloy, such as B10, containing 10% nickel) offers excellent seawater resistance and low-temperature performance, making it suitable for use in marine engineering and cryogenic equipment. Based on the processing technology, copper sheet can be divided into hot-rolled copper sheet (3-50mm thick, with a rough surface and good toughness, suitable for rough machining) and cold-rolled copper sheet (0.2-10mm thick, with a smooth surface and high dimensional accuracy, used for precision components). Its core features focus on "functional adaptability": First, it offers exceptional electrical and thermal conductivity. Pure copper sheet boasts a thermal conductivity of approximately 401W/(m·K), five times that of carbon steel and ten times that of stainless steel, making it suitable for high-performance heat sinks. Its electrical conductivity is second only to silver, making it a core conductive material in the electronics industry, irreplaceable by carbon steel and stainless steel. Second, it boasts excellent ductility. Pure copper sheet can be cold-bent and stretched into extremely thin foil (thickness ≤ 0.01mm) or stamped into complex shapes (such as electrical terminals), offering processing flexibility far exceeding that of high-carbon steel. Third, it offers a balanced balance between decorative and corrosion resistance. Pure copper sheet exhibits a rose gold surface, which, upon oxidation, forms a stable patina (basic copper carbonate), creating a vintage aesthetic. Brass sheet exhibits a golden yellow color and can be used directly as a decoration without painting. Cupronickel sheet offers corrosion resistance close to that of stainless steel, but at a lower cost, making it suitable for mid- to high-end corrosion-resistant applications. Fourth, it offers a balanced price-performance ratio. The unit price of pure copper sheet is 8-10 times that of carbon steel and 3-4 times that of stainless steel. Brass plate costs only 1/2-2/3 of pure copper plate, meeting most low- and mid-range functional requirements.

Applications cover both functional and decorative fields: In the electronics and electrical sector, pure copper plate is used to make electrical busbars, transformer windings, and the conductive layer of circuit boards. In the thermal conductivity and heat dissipation sector, pure copper and brass plates are used in LED heat sinks, computer CPU heat sinks, and automotive radiator fins. In architectural decoration, brass plates are used in hotel lobby curtain walls and elevator door frames, while pure copper plates, after oxidation, are used in retro-style building roofs and handicrafts. In machinery manufacturing, bronze plates are used to make machine tool bushings and bearing bushings (wear-resistant), while white copper plates are used in pipes and valves on marine vessels (resistant to seawater corrosion). Furthermore, pure copper plates are used in the new energy sector to make lithium battery tabs (highly conductive), and in the musical instrument industry, brass plates are used to make the cavity of instruments such as trumpets and trombones (excellent acoustic performance). There are four key points to consider when using this product: First, choose the right material. For high electrical and thermal conductivity, choose pure copper (T2); for general-purpose applications, choose brass (H62); for wear resistance, choose bronze (QSn6.5-0.1); and for seawater resistance, choose white copper (B10). Avoid over-selection of materials. Second, consider proper processing. The surface of cold-rolled copper is easily scratched, so use a soft cloth during processing to avoid direct contact with sharp tools. For welding, use copper-specific welding wire (such as pure copper wire SCu-1 or brass wire SCuZn-3). Clean the welding slag after welding to prevent it from affecting electrical and thermal conductivity. Thermal conductivity); third, storage and oxidation prevention. Pure copper and brass plates need to be stored in a dry and sealed environment. They can be coated with anti-rust oil or wrapped with moisture-proof film (to prevent oxidation and discoloration), and avoid contact with acidic substances (such as acetic acid and hydrochloric acid) (to prevent corrosion); fourth, maintenance. If the surface shows slight oxidation and discoloration, it can be wiped with a copper-specific cleaner (such as a cleaner containing citric acid). It is forbidden to polish with a steel wire ball (to avoid damaging the surface gloss); if decorative copper plates need to maintain their original color, they can be regularly coated with copper protective agent (to form a transparent protective film).