公开(公告)号：US20230304110A1

公开(公告)日：2023-09-28

申请号：US18022791

申请日：2021-08-23

Applicant: JFE STEEL CORPORATION

Inventor： Nobuhiko ODA ,  Futoshi OGASAWARA ,  Kentaro KAKIGI ,  Takayoshi FUKUYAMA

IPC: C21C7/00 ,  C21C5/28 ,  C21C7/068

CPC classification number: C21C7/0025 ,  C21C5/28 ,  C21C7/068

Abstract: A method for producing chromium-containing molten steel from a raw material including a chromium-containing raw material includes a first step in which a slag basicity before rough decarburization by oxygen blowing is adjusted to be not less than 1.5 and not more than 3.0, a slag basicity after rough decarburization by oxygen blowing is adjusted to be not less than 2.0 and not more than 3.5, and then tapping is performed while slag containing a chromium oxide generated by the oxygen blowing is made to remain in the furnace, and a second step in which the slag containing a chromium oxide made to remain is reduced by using a carbon source or a metal source newly added into the same furnace so that chromium is recovered into molten steel. The slag basicity is determined by dividing a CaO concentration by an SiO2 concentration on a mass basis in the slag.