What are the key factors and supporting technologies for achieving low superheat casting

 　　The key to achieving low superheat casting is: (1) controlling inclusions in the steel to prevent nozzle nodules during the low superheat casting process; (2) Accurately control the temperature stability of the molten steel in the tundish during the continuous casting process; (3) Stable control of production rhythm from steelmaking to continuous casting.

　　To control the composition of inclusions in steel, calcium treatment technology is commonly used. However, when the sulfur content in the steel is high, CaS inclusions can easily form, leading to nozzle nodulation, and the point like inclusions formed by calcium treatment are very harmful to some steels. The use of low aluminum clean steel technology can achieve the dual goals of improving cleanliness and optimizing inclusions. At present, secondary refining can control the temperature of molten steel within a very narrow range. In addition, the adoption of intermediate ladle insulation technology and steel inclusion control technology has created conditions for low superheat casting. Research has shown that the most effective way to control the stable temperature of molten steel in the tundish is to use a plasma heating device to supplement stable and reliable neutral heat energy to the tundish. In addition, reducing the superheat of steel liquid can also consider using water-cooled nozzles or using conical lossless condensers on the meniscus of steel liquid for auxiliary cooling.



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