脱りん銑を用いた転炉操業技術
1990 年 76 巻 11 号 p. 1908-1915
詳細
1990 年 76 巻 11 号 p. 1908-1915
A new process of hot metal pretreatment has been in operation since April 1984 at Kure Works. The process has made the mass-production of low phosphorous steels possible.
Until now, investigations of metallurgical characteristics in a top and bottom blowing converter using dephosphorized hot metal have been carried out, and the efficient operational techniques have been established. The results obtained are as follows ;
1) The oxygen utilization efficiency for decarburization at the last stage of oxygen blowing and Fe yield in the converter are increased by use of dephosphorized hot metal.
2) The OG dust is mainly composed of iron fume, the dust can be reduced by decreasing the area of hot spot by top blowing oxygen.
3) Manganese yield and chromium yield are increased and the life of refractories is developed by use of dephosphorized hot metal.
4) The continuous use of dephosphorized hot metal makes the slag basicity in the converter decreased. Consequently the refining cost of special steels was able to be reduced considerably.
