| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.35 ( November 1996 ) Steel Structure, and Continuous Casting of Steel ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Separation of Inclusions from Molten Steel
in a Tundish by Use of a Rotating Electromagnetic
Field Yuji Miki, Sigeru Ogura, Tetsuya Fujii |
| Synopsis: A new process was devised for promoting inclusion separation in a tundish. The process utilizes electromagnetic force to rotate molten steel in a cylindrical tundish. The centrifugal force caused by the rotational flow promotes separation of inclusions from the molten steel. This tundish is referred to as the centrifugal flow tundish (CF tundish). Industrial plant tests carried out at Chiba Works showed that the CF tundish has excellent deoxidation performance estimated at 0.17-0.25min-1 as a deoxidation rate constant. The mechanism of inclusion separation in the CF tundish is also discussed. The centripetal force and large amount of turbulent energy caused by the rotational flow accelerates inclusion separation. Furthermore, the residence time distribution of the molten steel in the tundish is improved, and slag removal during the ladle exchange is promoted. The process is successfully used in the commercial production of high-quality stainless steel slabs. |
| TextiPDF: 7P/303kbj |