The Development of Small Billet Continuous Casting Without Fluoride Protection Slag
Abstract
Fluoride protection slag technology is an important process for steel continuous casting, but it can cause the breakdown of the mold. In order to solve this problem, small billet continuous casting without fluoride protection slag is developed, which can solve the problem of incrustation of the launder and has solved the fluoride-free problem against the electric melter slag. This paper introduces the continuous casting process of small-billet steel without fluoride protection slag, the selection of flux and Refining method, the design of the tundish and the repairing of the mold. The rapid development of small-billet casting technology has accelerated the continuous development of the steel industry.
1. Introduction
The rapid development of modern industry and technology, the continuous improvement of steel production technology, and the development of continuous casting technology are very important. Especially the continuous casting process has been greatly improved. The continuous casting process is an important part of steel production, which includes the design and selection of flux and Refining method, control of tundish temperature, control of launder life, etc., among which the selection of flux and Refining method plays an important role in improving the steel quality. Especially in the continuous casting of small-billet steel,how to set the chemical composition of steel slag and to select suitable steel casting flux and Refining method are very important.
2. The process of the Development of Small-Billet Continuous Casting without Fluoride Protection Slag
In the continuous casting process of small-billet steel, fluoride protection slag technology is used to protect the slag due to its good effect on the prevention of oxidation and splashing of the steel liquid. However, this process has many disadvantages, such as easy sand slag, high return of steel liquid, incrustation of the launder, clogging of the launder and the production of electric melter slag. In order to solve this problem, small billet continuous casting without fluoride protection slag technology was developed. This process has many advantages, such as not producing electric slag, reducing the time of repairing the mold, and improving the working environment.
The process mainly includes the following aspects:
First, the selection of suitable steel Refining flux and method. In the continuous casting process of small-billet steel, a large amount of oxygen is introduced into the steel liquid to achieve the Refining of the steel liquid. The chemical composition of the steel slag must be ideal in order to achieve the purpose of Refining, so the selection of suitable steel Refining flux and method is very important.
Second, design of the tundish. The design of the tundish is also very important. The design of the tundish should be determined according to the working condition and design parameters of the continuous casting process. The temperature of the tundish should be controlled so that the cast steel can be cast smoothly.
Finally, the repair of the mold. The sand-making and incrustation of the launder caused by fluoride protection slag will reduce the life of the launder and result in higher repair costs. Small-billet casting without fluoride protection slag can solve the problem of incrustation of the launder, thus reducing the time and cost of repairing the mold.
3. Conclusion
The rapid development of small-billet casting technology has greatly accelerated the development of the steel industry. Small-billet casting without fluoride protection slag technology can solve the problem of incrustation of the launder, thus making the continuous casting of small-billet steel more efficient and simpler. The development of this technology will also promote the further development of the steel industry.
