Since the founding of the People's Republic of China, the country has given priority to the development of the iron and steel industry, and the output has grown rapidly. Since 1978, my country's steel output has exceeded 30 million tons. In 1980, the steel output reached 37.12 million tons, ranking fifth in the world. Today, it has already exceeded 100 million tons, ranking first in the world. Old China could only produce 100 ordinary carbon steel grades, but now it can smelt more than 2,000 varieties; the steel products are complete. The layout of the iron and steel industry has also undergone tremendous changes, and a steel industry system combining large, medium and small enterprises has been established nationwide.
                                                                                                                                                       
     In order not to reduce the work efficiency of the pipeline or tank equipment of the steel mill enterprise in winter, it is necessary to increase the antifreeze and heat preservation, and at the same time, it also involves flame retardant, explosion-proof and other requirements. The special electric heating cable for steel mills is installed behind the pipeline or tank equipment, and the output power is automatically adjusted in reverse with the temperature gradient of the pipeline when it is powered on. Heat is supplied to the inside of the oil pipe through the outer wall of the oil pipe, and a certain constant temperature is maintained along the line to achieve the purpose of reducing viscosity, dewaxing, and increasing flow rate.
                                                                                                                                                       
   The self-limiting temperature electric heating cable uses electric heating equipment to convert electrical energy into heat energy, and through direct or indirect heat exchange, supplements the heat lost by the heating equipment through the insulation material. When the equipment needs accurate insulation, it can be controlled by a thermometer. The temperature controller can be omitted if not required.
                                                                                                                                                       
     Self-limiting temperature electric heating cable has the advantages of high heat conversion efficiency, energy saving, convenient construction and installation, no pollution, and long service life. It can be used in many fields such as petroleum, chemical industry, electric power, construction, food, ship and so on.