Efficient ladle furnace refining method based on thin-slab casting and rolling production of high-strength steel

• Main Authors: LIU ZHIYONG, QI JIANGHUA, TAO WENZHE, PENG ZHUGANG, HUANG DAWEI, CHEN JIQING
• Format: Patent
• Language: Chinese; English
• Published: 15.02.2017
• 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 an efficient ladle furnace refining method based on thin-slab casting and rolling production of high-strength steel. The efficient ladle furnace refining method is characterized in that in a converter tapping stage, the converter tapping temperature ranges from 1,680 DEG C to 1,700 DEG C; quick oxygen probing is performed on molten steel in an argon station, and the addition of aluminum is determined according to the oxygen content; the ingredients and the alkalinity of an appropriate slag system are determined in the ladle furnace slagging stage; in the ladle furnace heating stage, after molten steel arrives at a station, a lower electrode heats up the molten steel, the heating power is controlled in a segmented manner, crusting on the slag surface is realized in the earlier stage, and slugging is performed at low gear; and after melting of slag, the slag surface is uniformly coated, heating is performed at high gear, point heating is adopted in the later stage, and one-time heating i