| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.8 ( September 1983 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Production of Ultra-Low Carbon Steel by Combined Process of Bottom-Blown Converter and RH Degasser Norio Sumida, Tetsuya Fujii, Yukio Oguchi, Hitoshi Morishita, Keisuke Yoshimura, Fumio Sudo |
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Synopsis : A method for producing ultra-low carbon steel with carbon content 20 ppm or less was investigated, and a highly efficient and yet economic manufacturing process using the combination of bottom-blown converter and RH vacuum degasser was established. First, the decarburizing reaction in the RH vacuum degasser was analyzed using a reaction model, and the relationship between operational conditions and the rate of decarburization was elucidated. On the basis of the analytic results, it was attempted to improve operational conditions for the decarburizartion under vacuum, and a technique to reduce the carbon concentration to 20 ppm or less within 10-15 min. of the decarburization treatment in RH was established. It is expected that the combination of the ultra-low carbon steel manufacturing process and the continuous annealing (KM-CAL) technique would greatly contribute to the production of cold rolled steel sheet having excellent mechanical properties such as of extra-deep drawing steel and deep drawing high strength steel. |
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