About copper

Copper is one of the earliest metals discovered and used by humans, purple-red, specific gravity 8.89, melting point 1083.4℃. Copper and its alloys are widely used because of their good electrical conductivity and thermal conductivity, strong corrosion resistance, easy processing, good tensile strength and fatigue strength, second only to steel and aluminum in metal material consumption, and have become indispensable basic materials and strategic materials in the national economy and people's livelihood, national defense projects and even high-tech fields. It is widely used in electrical industry, machinery industry, chemical industry, national defense industry and other departments. Copper fine powder is a concentrate made of low-grade copper-bearing raw ore which has reached a certain quality index through beneficiation process and can be directly supplied to smelters for copper smelting.

Copper is a heavy metal, its melting point is 1083 degrees Celsius, boiling point is 2310 degrees, pure copper is purple-red. Copper metal has good electrical and thermal conductivity, and its electrical conductivity ranks second in all metals, second only to silver. Its thermal conductivity ranks third, second to silver and gold. Pure copper is extremely malleable, the size of a drop of water, can be drawn into a 2,000 meter long filament, or rolled into an almost transparent foil wider than the bed surface.

 

"White phosphor copper plating" should mean "phosphor copper with white coating on the surface". "White plating" and "phosphor copper" should be understood separately.

White plating -- The appearance color of the coating is white. The plating material is different or the passivation film is different, the appearance color of the coating is also different. Phosphor copper tinning for electrical appliances is white without passivation.

 

Phosphorus copper - copper containing phosphorus. Phosphorus copper is easy to solder and has good elasticity, and is commonly used in electrical appliances.

 

Red copper is copper. It gets its name from its purple color. See copper for various properties.

Red copper is industrial pure copper, its melting point is 1083 °C, no isomerism transformation, and its relative density is 8.9, five times that of magnesium. About 15% heavier than normal steel. It has rose red, purple after the formation of oxide film on the surface, so it is generally called copper. It is copper containing a certain amount of oxygen, so it is also called oxygen-containing copper.

Red copper is named for its purplish red color. It is not necessarily pure copper, and sometimes a small amount of deoxidation elements or other elements are added to improve the material and performance, so it is also classified as copper alloy. Chinese copper processing materials can be divided into four categories according to composition: ordinary copper (T1, T2, T3, T4), oxygen-free copper (TU1, TU2 and high-purity, vacuum oxygen-free copper), deoxidized copper (TUP, TUMn), and special copper (arsenic copper, tellurium copper, silver copper) with a small amount of alloying elements. The electrical and thermal conductivity of copper is second only to silver, and it is widely used in the production of conductive and thermal equipment. Copper in the atmosphere, seawater and some non-oxidizing acids (hydrochloric acid, dilute sulfuric acid), alkali, salt solution and a variety of organic acids (acetic acid, citric acid), has good corrosion resistance, used in the chemical industry. In addition, copper has good weldability and can be made into various semi-finished products and finished products by cold and thermoplastic processing. In the 1970s, the production of red copper exceeded the total production of all other copper alloys.