Aluminum-free titanium-containing steel anti-flocculation-flow operation method

Abstract

The invention relates to an operation method of an aluminum-free titanium-containing steel anti-flocculation-flow operation method comprising the steps that: (1) after converter tapping, slagging is carried out, and molten steel is added into a lime cover tank; (2) fluorite, bauxite and lime are added, and stirring is carried out; (3) silicon-calcium-barium powder is added; (4) when slag is formed, rest lime is supplemented; during an LF furnace final-stage, slag thickening lime is added; (5) a titanium component is regulated and qualified in one time in an early-stage; (6) other components are refined, and it is required that regulation should be successful within a maximum of twice; (7) LF furnace treatment final-stage weak stirring and argon bottom blowing are carried out; (8) a soft sealing ring is adopted at a long nozzle before a continuous casting machine; (9) middle-ladle upper nozzle argon blowing is carried out; (10) middle-ladle molten steel casting level is stabilized; (11) middle-ladle level covering effect is ensured; and (12) large-pot weak argon blowing is carried out before the machine. Compared with prior art, the method provided by the invention has the advantages that: molten steel flocculation phenomenon is effectively reduced; square billet or slab continuous-casting no-flocculation-flow production is realized; production stability is ensured; production capacity and product quality are improved; and more economic benefit is provided for enterprises.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to an operation method for preventing flocculation of aluminum-free and titanium-containing steel. Background technique [0002] With the development of the steel industry, the continuous casting ratio of more and more enterprises has been improved, and many iron and steel enterprises have realized full continuous casting production. As we know, in the production process of aluminum-free and titanium-containing steel, because a large amount of titanium is used to remove oxygen in the steel, the aluminum content in the steel is very low, and it completely depends on titanium and silicon for deoxidation. Improper easy to cause TiO in steel 2 The content is high, and titanium is relatively active, which can easily cause secondary oxidation of molten steel to form TiO 2 Flocs, which reduce the fluidity of molten steel during the pouring process and are easily attached to the submer...

AI Technical Summary

Problems solved by technology

[0002] With the development of the steel industry, the continuous casting ratio of more and more enterprises has been improved, and many iron and steel enterprises have realized full continuous casting production. As we know, in the production process of aluminum-free and titanium-containing steel, because a large amount of titanium is used to remove oxygen in the steel, the aluminum content in the steel is very low, and it completely depends on titanium and silicon for deoxidation. Improper easy to cause TiO in steel 2 The content is high, and titanium is relatively active, which can easily cause secondary oxidation of molten steel to form TiO 2 Flocs, which reduce the fluidity of molten steel during the pouring process and are easily attached to the submerged nozzle, causing flocculation at the nozzle. Flocculation also occurs at the nozzle of large tanks in individual furnaces, which seriously affects the production of the continuous casting machine and cannot pass through the flow. To solve the problem of flocculation, which may cause pouring failure in severe cases, it is necessary to reduce the content of titanium in steel products or reduce TiO by forming complexes 2 melting point