Abstract：The present paper introduces the practice of improving the end point target-hitting by adoption of hot metal dephosphorizing pretreatment and direct steel-making process in 100t converter. Cold smelting charge ratio was respectively 20%,25%,28%, by optimizing slag making and oxygen blowing process of dephosphorizing pretreatment period and decarburizing period，oxygen consumption rate increased from 20～30% to 40～50% than conventional process in dephosphorizing pretreatment period and slag charge was controlled at 8～15kg.t-1 in decarburizing pretreatment period. Fifty heats industrial test results indicated that temperature controlling at first slag off achieve the level of conventional smelting process, the controlling levels of [C] and [P] were significantly better than conventional smelting process.
2010, Vol. 45 
