A Calcium-Free Treatment Killed Clean Steel Production Process

A production process and technology for clean steel, applied in the field of iron and steel metallurgy, 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 and pourability, and to save the cost of calcium treatment , the adsorption effect is obvious

Active Publication Date: 2020-03-20
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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  • A Calcium-Free Treatment Killed Clean Steel Production Process
  • A Calcium-Free Treatment Killed Clean Steel Production Process
  • A Calcium-Free Treatment Killed Clean Steel Production Process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Molten iron: reduce the sulfur content of the molten iron to less than 0.02% by means of pretreatment of the molten iron;

[0043] (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.

[0044] (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 ...

Embodiment 2

[0061] (1) Molten iron: reduce the sulfur content of the molten iron to less than 0.02% by means of pretreatment of the molten iron;

[0062] (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.

[0063] (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-so...

Embodiment 3

[0077] (1) Molten iron: reduce the sulfur content of the molten iron to less than 0.02% by means of pretreatment of the molten iron;

[0078] (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.

[0079] (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 ...

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Abstract

The invention discloses a production process of calcium-free treated calm and clean steel, which belongs to the technical field of iron and steel metallurgy, and is characterized in that the production of formable low-carbon aluminum killed and clean steel is performed without calcium treatment, and the specific process is: molten iron→oxygen Top-bottom compound blowing converter → LF refining → soft argon blowing at the bottom of the ladle → continuous casting → continuous rolling. Compared with the existing technology, the calcium treatment process is not used, which saves the cost of calcium treatment, avoids the problem of flocculation of high melting point aluminate, improves the formability of the steel plate, and reduces the probability of cold bending cracking.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a production process for formable low-carbon aluminum-killed clean steel in the field of thin slab continuous casting without calcium treatment. Background technique [0002] The current process of thin slab production of low-carbon (silicon-containing or silicon-controlled) 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 → soft argon blowing at the bottom of the ladle → thin slab continuous casting → continuous rolling process. Among them, the calcium treatment process is specifically: feeding molten steel into metallic calcium solid-core cored wire, the purpose of which is to control the appropriate calcium-aluminum ratio and generate low melting point liquid 12CaO·7Al ...

Claims

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Application Information

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