Ti-contained steel smelting method and AOD furnace

• Main Authors: YANG HUI, LU JIAN'ER, GAO YIBIN, WANG LI, JI JIANJUN, CHEN GENBAO, ZHANG JIAN, HUANG SHENSHEN, HUANG CHONGDE
• Format: Patent
• Language: Chinese; English
• Published: 24.10.2017
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; METALLURGY OF IRON; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS

The invention discloses a Ti-contained steel smelting method. All raw materials are prepared to Ti-contained steel by burdening, EAF furnace rough refining, AOD furnace fine refining and LF furnace fine refining; and the AOD furnace fine refining comprises the steps of: steel mixing, oxygen blowing, decarbonization and denitrification earlier stage, oxygen blowing, decarbonization and denitrification later stage, reduction, final slag production and component adjustment. Through increment of initial carbon content and prolonging of the decarbonization time, the N solubility is reduced, and the N content in AOD furnace tapping molten steel is reduced; the reduction procedure is improved; the content of B type inclusions using aluminum oxide as typical components in the AOD furnace tapping molten steel is reduced; the subsequent Ti element adding loss is reduced; the Ti utilization rate is increased; and the Ti steep tapping quality is improved. The invention further discloses an AOD furnace; the installation o