公开(公告)号：US20230121123A1

公开(公告)日：2023-04-20

申请号：US17953832

申请日：2022-09-27

Applicant: University of Science and Technology Beijing

Inventor： Yanling ZHANG ,  Zheng ZHAO ,  Weifeng ZHANG ,  Zhonghua ZHAN

IPC: C21C7/064 ,  C21C1/02 ,  C21C7/068

Abstract: A method of making steel by deeply dephosphorization in a hot metal tank and decarburization using semi-steel with nearly zero phosphorus load in a converter includes the following steps: putting an efficient dephosphorization agent into the hot metal tank in advance, and conducting dephosphorization during blast furnace tapping and transportation of blast furnace hot metal by the hot metal tank to obtain semi-steel with [P] less than 0.04 wt. % and [C] greater than or equal to 3.5 wt. %; and removing dephosphorization slag, and pouring the semi-steel into the converter for decarburization to obtain molten steel. The efficient dephosphorization agent includes iron oxide scale, lime, and composite calcium ferrite. According to the method, a phosphorus content of the blast furnace hot metal is reduced to be less than or equal to 0.04 wt. % through the efficient dephosphorization agent.