| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.1 ( September 1980 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Recent Progress of OBM/Q-BOP Steelmaking at Kawasaki Steel Corporation Kyoji Nakanishi, Tsutomu Nozaki, Ryoji Uchimura, Toyohiko Ohta, Makoto Saigusa, Jun Nagai, Fumio Sudo |
| Synopsis : Kawasaki has succeeded in prolongation of the bottom life of the Q-BOP:2063 heats at the maximum and 1500 heats on an average. A newly developed method, "Panel AE Spalling Test", has shown the magnesia-carbon brick to be most preferable for bottom refractories. The OG gas recovered from the Q-BOP contains the latent heat exceeding 2700kcal/Nm3. Kawasaki has completed the dynamic control system called "SMART" which has contributed to a marked improvement of hit rate for both carbon and temperature at turn-down with the highest record of 98.8%. For a given temperature and slag composition, the steel made in the Q-BOP contains more manganese, less oxygen and less sulfur than that of the LD. The lowest carbon levels are 0.01% while blowing oxygen and 0.006% by rinsing with inert gas. Both are quite lower than those of the LD. To comprehensively interpret all the oxidizing furnaces such as the Q-BOP, the LD and the AOD, a new parameter ISCO has been proposed. ISCO stands for Index for Selective Carbon Oxidation, which consists of a chemical and a kinetic terms. The validity of ISCO has been shown in connection with the dephosphorization reaction and the chromium oxidation. |
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