| 摘要 |
The present invention relates to a continuous-continuous casting method comprising: a step of measuring the initial discharge amount (D0) of molten steel transferred from a tundish to a mold and the initial height (H0) of a stopper inside the tundish at the beginning of the start of continuous casting; a step of calculating the theoretical height of the stopper against the discharge amount (D) of the molten metal, which is transferred from the tundish through the submerged nozzle in a normal state, using the initial discharge amount (D0) and the initial height (H0); a step of measuring multiple operation heights (Hw), which are the heights of the stopper when the molten steel is discharged as much as the discharge amounts (D) thereof, at multiple timings during the continuous casting; a step of obtaining multiple clogging indexes (IDc) of the submerged nozzle using the theoretical height (Hs) and the operation heights (Hw); a step of calculating a nozzle clogging velocity (Vc) using the clogging indexes (IDc) of the submerged nozzle and the timings; and a step of calculating continuous-continuous casting remaining time (RT) due to the submerged nozzle during operation by substituting a predetermined reference value, the clogging indexes (IDc) of the submerged nozzle, and the nozzle clogging velocity (Vc) in a relational formula below. [Reference numerals] (AA) Start; (BB) End; (S10) Measure the initial discharge amount of molten steel and the initial height of a stopper; (S20) Calculate the theoretical height of the stopper against the discharge amount of the molten steel; (S30) Measure multiple operation heights of the stopper in continuous casting; (S40) Obtain multiple clogging indexes of a submerged nozzle; (S50) Calculate nozzle clogging velocity; (S60) Calculate continuous-continuous casting remaining time (RT); (S61) Calculate continuous-continuous casting end timing |
