Method for controlling splashing in desiliconization period of smelting stainless steel

• Main Authors: HOU HAIBIN, FAN JUN, ZHAO XINMIAO, HUANG CHENHAO, ZHU YI
• Format: Patent
• Language: Chinese; English
• Published: 27.09.2022
• Subjects: CHEMISTRY; METALLURGY; METALLURGY OF IRON; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS

The invention relates to the field of steelmaking. A method for controlling splashing in the desiliconization period of stainless steel smelting comprises the following steps that (1) high-silicon pre-melting liquid is put into an AOD furnace, and temperature measurement and sampling are conducted; (2) calculating the cold charge adding amount, the lime adding amount and the oxygen blowing amount according to the charging conditions; (3) starting to observe the flame at the furnace mouth when the oxygen blowing amount reaches 80-90%; (4) after blowing is stopped, bottom blowing stirring is used; and (5) shaking the furnace to 85-90 DEG C, pouring the low-alkalinity slag into a slag pot, shaking the furnace to 0-4 DEG C, and starting normal smelting. According to the method, the oxidation of the alloy is reduced while the desilicication is ensured, the fluidity of the slag is ensured by reasonably controlling the physicochemical characteristics of the slag at the end point of the desilicication period, the suc