Copper is one of the earliest metals discovered and used by mankind. It is purplish red in color, with a specific gravity of 8.89 and a melting point of 1083.4°C. Copper and its alloys are widely used because of their good electrical and thermal conductivity, easy processing, good tensile strength and fatigue strength. Copper and its alloys due to good electrical and thermal conductivity, corrosion resistance, easy processing, tensile strength and fatigue strength and is widely used in the consumption of metal materials, second only to iron and steel and aluminum, and has become an indispensable basic material and strategic materials in the field of national economy and national defense projects and even high-tech.
In the electrical industry, mechanical industry, chemical industry, defense industry and other sectors have a wide range of uses. Copper concentrate is made of low-grade copper-bearing ore through the beneficiation process to achieve a certain quality index of the concentrate, can be directly for the smelter refining copper.
Copper is a heavy metal, its melting point is 1083 degrees Celsius, boiling point is 2310 degrees Celsius, pure copper is purple-red. Copper metal has good electrical and thermal conductivity, its electrical conductivity in all metals in the second place, second only to silver; its thermal conductivity in every third place, second to silver and gold. The ductility of pure copper is excellent, a drop of water-sized pure copper, can be drawn up to 2000 meters of filaments, or be calendered into a wider than the bed almost transparent foil.
The term "white-plated copper phosphorus" should be taken to mean "copper phosphorus with a white coating on the surface". The terms "white plated" and "phosphor bronze" are to be understood separately.
White plating --- The color of the plating is white in appearance. The color of the coating varies depending on the plating material or passivation film. Phosphorus copper for electrical appliances plated with tin without passivation is white.
Phosphorus copper - copper containing phosphorus. Phosphorus copper is easy to solder and has good elasticity, and is commonly used in electrical appliances.
Copper is copper alone. Named for its purple-red color, various properties see copper.
Categories of Copper
Copper is industrial pure copper, its melting point of 1083 ℃, no isotopic transformation, the relative density of 8.9, for the magnesium five times. About 15% heavier than ordinary steel. It has a rose-red color, the surface of the formation of oxide film is purple, so it is generally known as purple copper. It is a copper containing a certain amount of oxygen, and therefore also known as oxygenated copper.
Purple copper is named for its purple color. It is not necessarily pure copper, sometimes also add a small amount of deoxygenated elements or other elements to improve the material and performance, so also categorized as copper alloy.
China copper processing material according to the composition can be divided into: ordinary copper (T1, T2, T3, T4), oxygen-free copper (TU1, TU2 and high purity, vacuum oxygen-free copper), deoxidized copper (TUP, TUMn), add a small amount of alloying elements of the special copper (arsenic copper, tellurium copper, silver copper) four categories.
The electrical and thermal conductivity of copper violet is second only to silver, widely used in the production of electrical and thermal conductivity equipment. Copper in the atmosphere, seawater and some non-oxidizing acid (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, can be cold, thermoplastic processing made of a variety of semi-finished and finished products. 1970s, the production of copper exceeded the total output of other types of copper alloys.
