Hot varieties of copper processing materials, including calendered copper foil, lead frame copper strip, transformer strip... China has about 250 kinds of copper processing materials, nearly 1000 product varieties, and is one of the countries with the richest product varieties in the world. In the numerous varieties of copper processing materials, a large number of hot and internationally advanced products have emerged, which represent the mainstream direction of modern processing technology and application.

In recent years, great changes have taken place in the varieties of copper processing materials in China. In close combination with the market and scientific and technological development needs, significant achievements have been made in the development of new products and materials. In order to meet the various demands of national economy, science and technology for copper products, various copper processing enterprises have also formulated a number of internal supply technical standards.

(1) Calendered copper foil

Calendered copper foil is an important material for flexible printed circuit board (FPC).

With the promotion and popularization of high-end, miniaturized and portable electronic products such as mobile phones, laptops, digital cameras, video cameras, LCD displays, etc., the demand for flexible printed circuit boards has soared.

In addition to static deflection, flexible printed circuit boards can also be dynamically flexed and folded to achieve three-dimensional development, which can effectively improve the freedom and flexibility of circuit design and mechanical design, and improve the reliability and stability of the entire system of electronic equipment.

The copper foil used for flexible printed circuit board includes both rolled copper foil and electrolytic copper foil. The calendered copper foil is used more and more because of its high ductility and excellent mechanical properties, especially in many special occasions.

(2) Lead frame copper strip

Lead frame copper strip is the key material of integrated circuit. At present, lead frame packaging accounts for more than 80% of all IC packaging, and is used to manufacture integrated circuits and discrete device lead frames. On average, 100 tons of copper strip is required for 100 million pieces.

In 2005, the output of integrated circuits in China reached 26.5 billion pieces, increasing by 20% annually in recent years. Affected by the financial crisis in the second half of last year, the output decreased significantly. In 2006, the industrialization level of lead frame copper tape in China has been greatly improved, and Luotong Group and Ningbo Xingye have become their important production bases.

At present, the self-sufficiency rate of copper strips for discrete devices has been improved in China, while the lead frame copper strips for high integration still rely on imports. C194 alloy with medium strength and conductivity has been industrialized in China, while C7025 alloy with high strength and conductivity has been developed. The copper chromium zirconium alloy with higher strength is still blank. This project of Chinalco Luotong and Chinalco Daye focuses on lead frame and cable copper strip.

(3) Transformer copper strip

It is mainly used to make winding units of dry-type transformers, and has been widely used in oil immersed transformers, with great market potential.

It is resistant to impulse voltage, strong in short circuit and overload, high in efficiency, flame retardant, explosion-proof, low in noise, small in size, light in weight, maintenance free, low in operating cost, and has high use safety and environmental adaptability.

In the middle and late last century, dry-type transformers developed rapidly all over the world and entered China in the late 1980s. At present, China has become one of the largest dry transformation production and sales countries in the world. In 2005, the output has exceeded 50 million KVA. In general, 400KG copper tape is used for every 1000KVA capacity of dry transformer at low-voltage side. If the high and low voltage sides are all made of copper tape, 880KG copper tape shall be used for every 1000KVA capacity.

At present, all high and low voltage copper strips account for about 20% of the total output, and the rest are copper strips for low voltage and copper wires for high voltage. In 2006, the use of copper strips for transformers exceeded 60000 tons. The demand of this product is that the coil weight is larger, the precision is higher, the surface quality is better, the conductivity is higher, and the strip edge is free of burrs.

(4) Cable copper strip

It is mainly used for shielding communication cables, RF cables, electronic cables and leaky cables.

High frequency welding is divided into copper tube and outer winding.

1) Communication cables are cables that transmit telephone, telegraph, television, fax, data and other telecommunication signals;

2) RF cable is applicable to the cable used to transmit RF signals in radio communication, broadcasting and related electronic equipment, also known as "radio cable";

CATV cable is the representative product with the largest output among electronic cables. At present, 33 production lines have been introduced, and the output is more than 700000 kilometers.

Mobile communication is one of the fastest growing branches in the field of telecommunications in recent years. Radio frequency cables for base station antennas of mobile phones and leaky cables for mobile communications have developed rapidly. There are dozens of enterprises producing leaky cables, and the demand for cable copper tape has exceeded 50000 tons.

In recent years, the red copper oxygen free copper subsurface casting has been built to meet this need. The current development direction is heavy coil, high-precision and high-purity copper strip.

(5) Copper strip for connector (connector)

With the development of electronic industry, copper and its alloy connectors have become important basic materials. The modernization of connectors has put forward higher and newer requirements for copper alloy materials.

It not only has high conductivity, corrosion resistance, oxidation resistance, excellent stamping performance and good bending performance, but also requires materials with high yield ratio, excellent elasticity and stress relaxation resistance, and low cost.

Communication, computer and automobile are the three pillar markets of connectors. At present, the most commonly used copper alloy materials for making connectors are H65 brass, QSn6.5-0.1 tin bronze, and beryllium bronze used in high strength, high conductivity requirements and special occasions.

(6) The strip for welding is mainly used in the production of copper clad aluminum wire

This composite wire is used for the inner conductor of video cable, and its performance is superior to that of pure copper wire, with a typical specification of 0.38 * 132mm. This tape has high conductivity and strict width tolerance. The total domestic output has reached 35000 tons. With the development of copper aluminum composite materials, the demand for this tape is growing rapidly.

(7) The production capacity of ultra-fine, ultra-thin, high cleanliness, high-precision, complex tooth profile and heavy coil internal threaded copper tubes for air conditioning and refrigeration equipment has increased rapidly.

Compared with the bypass smooth tube, the heat transfer efficiency is increased by 2-3 times, and the copper material is saved by 30%. It can adapt to the new refrigerant with zero ozone layer destruction coefficient, thus contributing to environmental protection, energy saving, material saving, miniaturization and high efficiency of air conditioners.

The application proportion of internally ribbed copper tubes in domestic air conditioners in China has reached 80%, and is moving towards full threading. It has become an important variety of copper tubes for export, representing the level of internally ribbed copper tubes in the world.

High finned tube and external thread tube are another kind of high efficiency heat sink tube, which is three times of the heat transfer efficiency of smooth tube. They are expected to replace smooth tube products in seawater desalination and electric field main condenser.

Mosquito coil has become an important export product because of its convenient packaging, transportation and use, which rapidly replaces straight tube products.

(8) The spring of application of copper water pipe, air pipe and heating pipe for construction in China has come.

The production of copper pipe materials, copper pipe fittings and plastic copper clad pipes has been completed. Copper pipe material has become the only representative of modern building pipeline materials due to its outstanding characteristics of sterilization, non aging, corrosion resistance, good installation performance and complete recycling.

(9) Although copper alloy tubes for condensers are challenged by the application of welded stainless steel copper tubes, with the development of the electric power industry, the output of copper alloy condenser tubes is still growing gradually, and the application of copper alloy condenser tubes in marine engineering, ships, seawater desalination, chemical industry, paper making, sugar production and other aspects is expanding.

The application of high efficiency heat sink tube (external thread tube) in thermal power condenser shows that the heat transfer effect is three times that of the original smooth surface condenser tube, which can save one-third of the energy.

(10) The automobile synchronizer ring gear tube is used for the manufacture of automobile synchronous reliable speed change gears. This alloy is made of multi-element wear-resistant brass and is usually produced by hot extrusion.

The pipe diameter is 50~140mm, the wall thickness is 5~10mm, and the consumption of each car is 0.6KG. China's automobile industry has developed rapidly. In 2007, the total output reached 8.88 million, ranking the second in the world. In 2010, it reached 10 million, and the consumption in 2010 reached 6000~10000 tons.

(11) Copper pole and bar type wire.

Copper wire rod has become an important product as a copper wire blank. The chemical composition of domestic high-quality copper rod fully conforms to GB/3952-2008 T1 standard, and the conductivity reaches 100.5-101.6% IACS. Alloy wire is produced with copper rod by up drawing and horizontal continuous casting. The hot spots in the bar type wire include profiled wire, special enamelled wire, high-speed train wire, etc.

(12) The research and development of new metal materials and new products are very active, among which the production of high-strength and high conductivity materials, environment-friendly lead-free copper and alloy materials, various large length special-shaped copper processing materials, and efficient heat sink tubes (internal threads, external fins, external threads, etc.) have made significant progress.

Source: Tianke Intelligence