Abstract
The vacuum treatment is now a necessary process especially for high grade steel. In our works, the stream degassing of ingot had been applied for producing seamless pipe with heavy wall and large diameter. However our vacuum degassing process had not enough capacity to be applied for all necessary heats. Thus, we have newly installed 50 t Elo-Vac Unit of the ladle degassing process, called Witten process which is possible to treat both normal degassing for all heats and vacuum oxygen decarburization for stainless steel. Our 50t Elo-Vac Unit has been operated since October, 1972.
At present, operations have been performed satisfactorily and we have produced approximately 49000 t stainless steel by V. O. D. process and 45000t carbon and alloy steel by normal degassing till December, 1974. This unit is making a great contribution toward keeping high quality as well as saving production cost in manufacturing stainless steel. This paper describes the outline and operations of the Elo-Vac Unit, especially vacuum refining process of stainless steel.
