Method for smelting ultra-clean Cr-Ni-Mo-V molten steel by using CO2-Ar

• Main Authors: WANG XUYANG, MENG XINYU, LIU PENGYUN, XIAO FANGWEI, WANG YIPING, GAO CHUNLIANG, LI YAQIANG, HAN BAOCHEN, SUN XIAOYI
• Format: Patent
• Language: Chinese; English
• Published: 26.04.2024
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; METALLURGY OF IRON; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a method for smelting ultra-clean Cr-Ni-Mo-V series molten steel by using CO2-Ar, and belongs to the technical field of steelmaking processes. An intermediate frequency furnace smelting system is adopted in the smelting process, and the smelting process comprises an early-stage melting stage, a middle-stage mixing bottom blowing stage, a middle-stage feeding bottom blowing stage and a later-stage feeding bottom blowing stage. The method is suitable for the process of smelting high-alloy special steel in a 10kg-50t intermediate frequency furnace; cO2-Ar is adopted as bottom blowing stirring gas, alloy is added into a molten pool for smelting according to the sequence of the content of alloy elements and the oxidation property strength, the mixing proportion and flow of bottom blowing CO2-Ar are adjusted in real time according to the content, predicted by a computer and a control system, of different alloy elements in molten steel, a large number of CO bubbles are generated through the r