Production control method for ultra-low limit sulfur in low-carbon low-phosphorus clean steel

• Main Authors: GUAN LIUHUI, SUN TUO, ZHANG LEI, LI YONG, ZHANG ZHENSHEN, WANG HAIYAN, WANG ZHONGQI, XIA ZHISHENG, TIAN YUNSHENG, HUANG ZHONG, WANG XINZHI, SUN YUQIANG, WANG FEIRI, WU YUPU, LIU HAIQIANG, KONG DENAN, LI ZHIGUANG
• Format: Patent
• Language: Chinese; English
• Published: 22.11.2019
• 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 provides a production control method for ultra-low limit sulfur in low-carbon low-phosphorus clean steel, and belongs to the technical field of metallurgical steelmaking. The method comprises the steps that molten iron pretreatment is specifically used for providing low-sulfur molten iron for a converter; low-temperature mid-term process deslagging in the early stage of the double-blown converter is carried out to achieve low-phosphorus control of the converter; middle and later period secondary slagging of the double-blown converter, the last phase post stirring function and high temperature tapping are carried out, so that high temperature, low carbon and low sulfur and phosphorus tapping of the converter are achieved; an argon blowing station is used for ladle pre-slaggingto create favorable conditions for rapid deep desulfurization of LF refining and inhabitation of recarburization and nitrogen increase; LF refining is used for achieving accurate deep desulfurization; and VD vacuum degassing