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Due to the limitation of economic strength and technical level, the construction of urban rail transit in my country started late. The quality characteristics of various paper-covered wires are different, but they all have four major properties: mechanical properties, chemical properties, electrical properties, and thermal properties. Enameled wire is the main and key raw material for electromagnetic windings of motors, electrical appliances and household appliances, telecommunications, and electronic instruments. Before 2000, only Beijing, Shanghai and Guangzhou had rail transit lines in the country. It is composed of a conductor and an insulating layer. After the bare wire is softened by annealing, it is painted and baked many times. With industrial electrical appliances and entering the 21st century, with the rapid development of China's economy and the acceleration of urbanization, urban rail transit has also entered a period of great development. At present, more than 40 cities in my country have formulated large-scale rail transit development plans. At present, 10 cities in my country have opened 31 urban rail transit lines with an operating mileage of 835km. It is estimated that by 2016, my country will build 89 urban rail transits totaling 2500km. my country's urban rail transit industry has entered a new stage of leapfrog development, and my country has become the world's largest urban rail transit market. According to forecasts, during the "Twelfth Five-Year Plan" period, rail transit cables for trains and trailers will be approximately 25,000 to 30,000 kilometers. The rapid development of household appliances, telecommunications, and electronic products will bring a broader application field and market to enameled wires. The annual volume of signal cables for urban rail transit is about 15,000 to 20,000 kilometers.

my country has become the world's paper-covered wire manufacturing center and processing base, and is the world's largest paper-covered wire production and sales country, accounting for about 30% of the world's total output. China's enameled wire production volume in the past two decades, the rail transit special cable market is mainly occupied by three cable companies, namely Haoxun, Nexans and Chaohu Haixing Cable Factory. Among them, Haoxun and Nexans are both global high-end special wire and cable manufacturers, and have established production bases in China. In the rapidly developing high-speed rail field, the two foreign-funded enterprises together occupy more than 90% of the market share. The field also occupies about 60% of the market. Chaohu Haixing Cable is the largest rail transit cable manufacturer in China, increasing at an annual rate of over 10%. It is expected to increase to about 50% by 2015, reaching a scale of 1.6 million t/a, becoming a veritable enameled wire production country and power. It is a designated professional wire manufacturer by the Ministry of Railways, occupying about 35% of the market share in urban rail transit and about 10% in the field of high-speed rail.

The rail transit field is also the same as the civil aviation field. After long-term development, China has become a large producer and user country of electronic components such as relays, micro-motors, and electronic transformers. However, due to the process, technology, and equipment However, the supply of high-performance special cables has to rely on imports. Fortunately, companies such as Chaohu Haixing have emerged in this field that can partially replace imports. I believe that with the amount of cables used in rail transit With the continuous expansion and deepening of the research and development process of the company, more and more similar companies will come to the fore. The domestic production capacity of fine enameled wire is far from being able to meet the demand. Occupy a place in this high-end market.