A kind of high aluminum composite phase steel and its smelting method

Abstract

The invention discloses high-aluminum complex-phase steel and a smelting method thereof. The smelting method of the high-aluminum complex-phase steel comprises the following steps: adding desulfurized liquid iron into a dephosphorization converter and a decarburization converter for duplex smelting; performing deoxidation and tapping on liquid steel after blowing of the decarburization converter is ended, wherein the aluminum deoxidation yield of the deoxidation and tapping process is 88% to 92%, the aluminum alloying yield of the deoxidation and tapping process is 78% to 82%, and the target aluminum content of the deoxidation and tapping process is 1.4% to 1.5%; performing LF (Low-Frequency) refining on the deoxidized and tapped liquid steel; performing RH (Ruhrstahl Heraeus) refining on the LF-refined liquid steel at a vacuum condition; performing calcium treatment on the RH-refined liquid steel and feeding 450m to 550m of a wire into each furnace to finish the smelting; performing full-protective pouring on the smelted liquid steel. The high-aluminum complex-phase steel and the smelting method disclosed by the invention have the advantages of effectively solving the technical problems that the existing aluminum deoxidized steel is low in aluminum content and is incapable of containing target ingredients which are actually required by the high-aluminum complex-phase steel, realizing high aluminum alloying yield without reducing the production stability, and obtaining high-aluminum complex-phase steel of which the final aluminum content is 1.2% to 1.4% by smelting, wherein the high-aluminum complex-phase steel contains the target ingredients of an actual steel type required by a user.

Description

technical field [0001] The invention relates to the technical field of steelmaking technology, in particular to a high-alumina multi-phase steel and a smelting method thereof. Background technique [0002] In the composition design of high-strength steel, aluminum has the effect of stabilizing austenite, and obtains paraustenite structure, which transforms into martensite during the deformation process, which improves the strength and toughness of strip steel. The difficulty of aluminum alloying in the steelmaking process is greater than that of other elements, so the aluminum content in steel is below 0.1%. The high-alumina composite-phase steel described in this method has an aluminum content of more than 1%. The existing smelting process makes it difficult to alloy aluminum, and the loss of aluminum components in the smelting process is large, which cannot meet the actual needs of the high-alumina composite-phase steel. target ingredient. During the continuous casting p...

AI Technical Summary

Problems solved by technology

[0003] The embodiment of the present invention solves the technical problem that the aluminum content of the existing aluminum deoxidized steel is low, so that the target composition actually required by the high-alumina multi-phase steel cannot be achieved by providing a high-aluminum multi-phase steel and its smelting method

Images