Calcium treatment-free production process of low-carbon silicon-containing killed clean steel

A production process, clean steel technology, applied in the field of calcium-free treatment of low-carbon silicon-containing killed clean steel production process, can solve the problems of limiting the production efficiency of thin slab continuous casting, affecting the forming performance of steel plates, CaS inclusions, etc., to meet the cleanliness requirements and pourability requirements, saving calcium treatment costs, and obvious adsorption effect

Active Publication Date: 2020-07-17
RIZHAO STEEL HLDG GROUP
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  • 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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  • Calcium treatment-free production process of low-carbon silicon-containing killed clean steel
  • Calcium treatment-free production process of low-carbon silicon-containing killed clean steel
  • Calcium treatment-free production process of low-carbon silicon-containing killed clean steel

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Experimental program
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Effect test

Embodiment 1

[0043] (1) Molten iron: reduce the sulfur content of the molten iron to less than 0.02% by means of pretreatment of the molten iron;

[0044] (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 to 2 o 3 The total amount of deoxygenated inclusions.

[0045] (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 2The 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 comp...

Embodiment 2

[0062] (1) Molten iron: reduce the sulfur content of the molten iron to less than 0.02% by means of pretreatment of the molten iron;

[0063] (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.

[0064] (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

[0078] (1) Molten iron: reduce the sulfur content of the molten iron to less than 0.02% by means of pretreatment of the molten iron;

[0079] (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.

[0080] (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; white slag is produced by refining; 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 perce...

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Abstract

The invention discloses a calcium treatment-free production process of low-carbon silicon-containing killed clean steel, and belongs to the technical field of iron and steel metallurgy. The process ischaracterized in that the production of the molded low-carbon low-aluminum killed clean steel is carried out under the condition that calcium treatment is not used, and the specific flow comprises the steps of processing molten iron, performing combined oxygen blowing to a converter from the top and the bottom, LF refining (adjusting the aluminum component of the molten steel, feeding aluminum for three times, and feeding aluminum-iron-rare earth core-spun yarn), performing argon soft blowing to the bottom of a ladle, continuous casting and continuous rolling. Compared with the prior art, a calcium treatment process is not adopted, so that the calcium treatment cost is saved, the problem that high-melting-point aluminate is prone to generate floccule flow is avoided, the forming performance of a steel sheet is improved, and the occurrence probability of cold bending cracking 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 field of iron and steel metallurgy technology, and in particular relates to the production process of formable low-carbon aluminum-killed clean steel without calcium treatment. Background technique [0002] At present, in the process of producing low-carbon silicon-containing aluminum-killed steel, calcium treatment is the core link. 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 soft blowing at the bottom of the ladle Process flow of blowing → thin slab continuous casting → continuous rolling. Among them, the calcium treatment process is specifically as follows: feeding molten steel into metallic...

Claims

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Application Information

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