Smelting method of dual-phase steel P980DP for cold-rolled coating substrate

The invention discloses a smelting method of dual-phase steel P980DP for a cold-rolled coating substrate. The smelting method comprises the following steps: S1, carrying out vanadium extraction and desulfurization pretreatment on raw material molten iron to obtain semi-steel; s2, the semi-steel is a...

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Hauptverfasser: WANG JIAN, YU CANSHENG, ZHOU WEI, LI LONG, CHANG ZHIYUAN
Format: Patent
Sprache:chi ; eng
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Beschreibung
Zusammenfassung:The invention discloses a smelting method of dual-phase steel P980DP for a cold-rolled coating substrate. The smelting method comprises the following steps: S1, carrying out vanadium extraction and desulfurization pretreatment on raw material molten iron to obtain semi-steel; s2, the semi-steel is added into a top-bottom combined blowing converter for decarburization treatment, the semi-steel is primarily smelted into molten steel and then tapped into a steel ladle, semi-deoxidation is conducted in the tapping process, and intermediate alloy is added according to the sequence of aluminum, silicon, manganese and chromium; s3, after 2/3 of tapping, adding 2-4kg/t of active lime into the steel ladle in a mixed flushing manner, and after tapping, adding 4-6kg/t of a steel calcium-series top slag modifier to the slag surface; s4, an Al wire is fed into the molten steel for deoxidation; s5, the LF procedure and the RH procedure are executed in sequence, alloy fine adjustment treatment is conducted, and temperature