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Preparation process of slag-stopping wire-feeding low-carbon aluminum killed clean steel

A preparation process and low-carbon aluminum technology, applied in the field of low-carbon aluminum-killed clean steel preparation technology for slag blocking and feeding lines, can solve the problems of limiting the production efficiency of thin slab continuous casting, affecting the formability of steel plates, CaS inclusions, etc., to meet the requirements of cleanliness It can meet the requirements of degree and pourability, save the cost of calcium treatment, and have obvious adsorption effect.

Pending Publication Date: 2020-06-02
RIZHAO STEEL HLDG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in actual production, using the above-mentioned calcium treatment process, the yield of calcium is often about 20%. At the smelting temperature, most of the calcium remains in the metal molten pool. The main forms are as follows (1) oxide inclusions, solid calcium aluminum (C.6A, C.2A, C.A); (2) CaS inclusions in molten steel, and the existence of these calcium forms can easily cause nozzle blockage, affecting and limiting the production efficiency of thin slab continuous casting; and, high melting point aluminum in molten steel Calcium acid inclusions affect the formability of the steel plate and are prone to cold bending cracking

Method used

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  • Preparation process of slag-stopping wire-feeding low-carbon aluminum killed clean steel
  • Preparation process of slag-stopping wire-feeding low-carbon aluminum killed clean steel
  • Preparation process of slag-stopping wire-feeding low-carbon aluminum killed clean steel

Examples

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Effect test

Embodiment 1

[0039] (1) Molten iron: reduce the sulfur content of the molten iron to less than 0.02% by means of pretreatment of the molten iron;

[0040] (2) Oxygen top-bottom combined blowing converter: adopt sub-lance technology and bottom blowing argon technology to control the molten steel [O] at the end of the converter 2 o 3 The total amount of deoxygenated inclusions.

[0041] (3) LF Refining: Adjust refining incoming molten steel [Al] 0.030-0.060%, molten steel temperature ≥ 1550°C; add lime at 8-12Kg / ton, control slag composition to be CaO 55-60%, Al 2 o 3 35-40%; SiO 2 3~4%; MgO 5~7%, alkalinity CaO / SiO 2 The value is 20-26; white slag is produced by refining; the aluminum composition of molten steel is adjusted, and the number of times of aluminum mixing is less than 3 times, specifically twice in this embodiment; 500 meters of limestone cored wire is fed; the silicon content of molten steel is 0.025-0.035%; refining out of the station The mass percentage of molten steel co...

Embodiment 2

[0058] (1) Molten iron: reduce the sulfur content of the molten iron to less than 0.02% by means of pretreatment of the molten iron;

[0059] (2) Oxygen top-bottom double-blown converter: adopt sub-lance technology and bottom-blown argon technology to control the molten steel at the end point of the converter [O] 2 o 3 The total amount of deoxygenated inclusions.

[0060] (3) LF Refining: Adjust refining incoming molten steel [Al] 0.04-0.06%, molten steel temperature ≥ 1550°C; add lime at 9Kg / ton, control slag composition to be CaO 57-60%, Al 2 o 3 35-40%; SiO 2 2~3.5%; MgO 5~7%, alkalinity CaO / SiO 2 The value is 22~25; white slag is produced by refining; the aluminum composition of molten steel is adjusted, and the number of times of aluminum blending is 2 times; the silicon content of molten steel is 0.025~0.035%; 0.025-0.035%, Mn: 0.08-0.20%, P≤0.015%, S≤0.003%, Alt: 0.015-0.040%, and the balance is iron and trace unavoidable impurities. Adjust the content of acid-solu...

Embodiment 3

[0074] (1) Molten iron: reduce the sulfur content of the molten iron to less than 0.02% by means of pretreatment of the molten iron;

[0075] (2) Oxygen top-bottom double-blown converter: adopt sub-lance technology and bottom-blown argon technology to control the molten steel [O] at the end of the converter 2 o 3 The total amount of deoxygenated inclusions. The end point of the converter and the tapping operation are important links in nitrogen control in the present invention.

[0076] (3) LF refining: Refining incoming molten steel [Al] 0.020-0.030%, molten steel temperature ≥ 1550°C; adding lime at 6-7Kg / ton, controlling slag composition to be CaO 55-60%; Al 2 o 3 25-30%; SiO 2 7~8%; MgO 5~7%, alkalinity CaO / SiO 2 The value is 7-8; refining produces white slag; the aluminum composition of molten steel is adjusted, and the number of times of aluminum distribution is strictly controlled to be less than 3 times, specifically twice in this embodiment; the mass percentage of...

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Abstract

The invention discloses a preparation process of slag-stopping wire-feeding low-carbon aluminum killed clean steel, belonging to the technical field of ferrous metallurgy. The preparation process is characterized in that the production of the formed low-carbon aluminum killed clean steel is carried out without calcium treatment, and comprises the following steps of: adjusting 0.02-0.04% of refinedincoming molten steel [ Al ] in an LF (ladle furnace) refining step, wherein the temperature of the molten steel is not less than 1550 DEG C; adding lime according to 6-7 Kg / ton, controlling the slagcomposition, wherein the alkalinity CaO / SiO2 value is 8-9; refining to prepare white slag; adjusting the aluminum component of the molten steel, adding aluminum twice, and feeding a limestone cored wire; and controlling the mass percent of the refined outgoing molten steel component. Compared with the prior art, the preparation process has the advantages that a calcium treatment process is not adopted, the calcium treatment cost is saved, the problem that high-melting-point aluminate is easy to generate flocculation flow is avoided, the forming performance of a steel plate is improved, and the cold bending cracking occurrence probability is reduced.

Description

technical field [0001] The present invention is a divisional application of the invention patent application "A Production Process for Calcium-free Killed Clean Steel" (Application No.: 2018100948303). It specifically relates to the technical field of iron and steel metallurgy, in particular to the production process of formable low-carbon aluminum-killed clean steel in the field of thin slab continuous casting without calcium treatment. Background technique [0002] At present, the process of producing low-carbon (silicon-containing) aluminum-killed steel, calcium treatment is the core link, and the specific production process generally adopts molten iron→oxygen top-bottom combined blowing converter→LF refining→argon soft blowing at the bottom of the ladle→calcium treatment→argon at the bottom of the ladle Air soft blowing → thin slab continuous casting → continuous rolling process. Among them, the calcium treatment process is specifically: feeding molten steel into metall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C33/04C21C7/00C21C7/064C21C7/06
CPCC21C7/0006C21C7/06C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06
Inventor 乔继纲
Owner RIZHAO STEEL HLDG GROUP
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