Copper clad steel refers to a composite wire that is copper coated with steel wire, which is a copper layer wrapped around the steel wire. It utilizes the skin effect of low-voltage and high-frequency signals to walk along the surface in the high-frequency region. Therefore, as long as the thickness of the copper layer reaches a certain range, signals in a certain frequency range can be ensured to be transmitted. Copper plays a role in transmitting weak electrical signals, while steel wire plays a supporting role. According to the different methods of wrapping copper onto steel wires, they are mainly divided into electroplating, coating, hot casting/immersion, and electroforming. The copper clad steel on the market basically adopts the electroplating process, which uses the working principle of electrolytic batteries to "dissolve" block shaped copper plates and then guide them through current to cover the steel wire. Wrapping is the process of wrapping a copper strip around a steel wire and welding it with argon arc welding at the interface of the wrapping; Hot casting/immersion is the process of heating and melting copper into a liquid. After the steel wire is threaded, the copper liquid is brought out and then cooled and solidified; Electroforming is a special application of electroplating, which achieves the reduction and aggregation of copper in the negative mold. This type of process is still rare. According to data analysis, copper clad steel originated from the American company COPPERWELL. Similar American companies such as COPPERPLUS and COPPERHEAD can also be found online to have copper clad steel products. However, COPPERWELL moved to China and learned from some high-end users that COPPERWELL in the United States is already struggling to survive, so selling it to FUSHI is also a good thing. The veteran enterprise ILJIN of South Korea sold the copper clad steel project to its old customer SAMATRON and began to focus on fiber optic cable products, while ILKWANG is still struggling with high tensile strength. COPPERSTEEL in Brazil cannot meet the local needs. With the transfer of polluting industries from developed countries to China as a production factory, a large number of copper clad steel manufacturers have sprouted in Deqing, Zhejiang and Zhangjiagang, Jiangsu. Along with the coating process, the production base of copper clad steel in China is concentrated in the Yangtze River Delta region. According to data, Xiangtan Cable Factory was the only factory in China's Ministry of Machinery system to produce copper clad steel wires at that time, with a production capacity of 500 tons. In early 1992, Harbin Cable Factory successfully developed copper clad steel wire products using the hot dip coating method to produce oxygen free copper rods, and plans to develop and produce copper clad steel tram wires in the future. The original electronics department mainly has three radio material factories that use electroplating process to produce tinned copper clad steel wires. During the "7th Five Year Plan" period, Shantou Electric Wire Factory introduced the West German plating production process and main equipment, with an annual production capacity of 300 tons of tinned copper clad steel wire; During the "7th Five Year Plan" period, Zhongyuan Radio Material Factory introduced the electroplating production process and equipment from the United States, with an annual production capacity of 100 tons of tinned copper clad steel wire. Ma'anshan Radio Material Factory imported key equipment from abroad, using electroplating production, with an annual production capacity of 150 tons of tinned copper clad steel wire. From the information on the patent website, it can be seen that Jiangyin Metal Products Research Institute developed the production process of copper clad steel as early as 1994, which is somewhat related to Faersheng's project. Zhangjiagang Friendship and Mancheng Baoshan Group were established in 1995, while Zhejiang Baichuan was established in 1997, Shaoyang was established in 1998, and Zhangjiagang Jinxin and Zhejiang North Communication were established in 1999, all of which are leading enterprises