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　　With the advancement of science and technology, the inorganic nonmetallic materials industry—whether in the production and casting of molten products, scientific research, or the testing of physical and mechanical properties—requires operations at high temperatures. Precise temperature control is essential under such conditions, and it is also necessary to carefully regulate the atmosphere and other process parameters. Flame furnaces, which rely on heat generated by fuel combustion for heating, suffer from drawbacks such as uneven temperature distribution within the kiln, difficulty in precise adjustment, and limitations on both firing temperature and atmospheric conditions. As a result, they cannot meet the aforementioned requirements. Therefore, there is a pressing need for new, high-performance thermal processing equipment. Casting electric furnace This goal can be achieved. This is because, compared to flame furnaces, induction casting furnaces have the following advantages:

　　(1) High thermal efficiency. Casting electric furnaces can heat products directly or indirectly without relying on combustion flue gases as a heat-transfer medium, thus eliminating heat losses caused by exhaust gases.

　　(2) The product quality is excellent. Casting electric furnaces do not require combustion air, produce no flue gas, and maintain a clean furnace chamber. Furnace temperature can be precisely controlled, and the specified heating system can be maintained with strict accuracy, ensuring a uniform temperature distribution throughout the furnace chamber. Typically, the baking temperature difference is kept within a range of ±5-10℃. Some casting electric furnaces have even narrower temperature fluctuation ranges, making them well-suited to meet the requirements of various heating systems. As a result, products baked in casting electric furnaces exhibit high quality and a high pass rate.

　　(3) It can control various atmospheres. While isolating the furnace from external air, desired gases such as H2 and N2 can be introduced into the furnace to precisely control the atmosphere required for the firing process.

　　(4) The equipment is simple and occupies a small footprint. A casting electric furnace does not require a combustion chamber, pipelines, flue gas exhaust systems, or chimneys. It also eliminates the need for fuel storage and slag disposal areas, and the furnace itself takes up even less space. As a result, it’s possible to reduce the area required for factories and workshops, thereby saving on equipment investment.

　　(5) The furnace lining has a long service life and a simple structure. Casting electric furnace Without a locally highly heated combustion zone (combustion chamber), the furnace lining will not be damaged by ash accumulation. Even if damage does occur, repairs are easy and inexpensive. As a result, the furnace lining boasts a long service life and a simple structure.

　　(6) The casting electric furnace is easy to operate, clean and hygienic, offers good working conditions, and can be equipped with automatic control systems.

　　The drawbacks of induction furnaces for casting include relatively complex auxiliary electrical equipment, high equipment costs, and expensive electricity bills. When firing under a reducing or neutral atmosphere, it is necessary to introduce the corresponding gases. Induction furnaces tend to produce molten iron with less-than-ideal properties, particularly when used for gray cast iron. However, this issue does not arise with ductile iron or compacted graphite iron, since both types of iron are produced by adding spheroidizing agents or vermicularizing agents, followed by inoculants. In fact, induction furnaces have distinct advantages when processing ductile iron and compacted graphite iron. For instance, low sulfur content can help reduce the amount of spheroidizing agent required. Thus, some of the challenges associated with induction furnaces are primarily relevant to gray cast iron—especially high-grade gray cast iron. Of course, gray cast iron still accounts for a significant portion of China’s total cast iron production, representing about 60%. Therefore, it is crucial to address the specific issues related to induction furnaces in the production of gray cast iron. Although induction furnaces have certain inherent limitations in terms of molten iron quality, these challenges can indeed be overcome through appropriate measures.