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Process for low-carbon silicon-controlled aluminum killed clean steel

一种洁净钢、镇静的技术，应用在低成本生产高成型性低碳铝镇静洁净钢的生产领域，能够解决限制薄板坯连铸生产效率、影响钢板成型性能、CaS夹杂等问题，达到满足洁净度和可浇性要求、省却钙处理成本、吸附效果明显的效果

Active Publication Date: 2020-07-24
RIZHAO STEEL HLDG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Process for low-carbon silicon-controlled aluminum killed clean steel
  • Process for low-carbon silicon-controlled aluminum killed clean steel
  • Process for low-carbon silicon-controlled aluminum killed clean steel

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 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.

[0044] (3) LF refining: Refining incoming molten steel [Al] 0.020-0.03%, 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 percentage of molten steel composition is controlled as follows: C: 0.038-0.045%, Si: 0.15-0.25%, Mn: 0.50-0.60%, P≤0.015%, S≤0.003...

Embodiment 2

[0050] (1) Molten iron: reduce the sulfur content of the molten iron to less than 0.02% by means of pretreatment of the molten iron;

[0051] (2) Oxygen top-bottom combined blowing converter: adopt sub-lance technology, bottom blowing argon technology, control the molten steel [O] at the end of the converter 2 o 3 The total amount of deoxygenated inclusions.

[0052] (3) LF refining: Refining incoming molten steel [Al] 0.035-0.050%, molten steel temperature 1550-1650°C; adding lime at 6-7Kg / ton, controlling slag composition to CaO 54-58%; Al 2 o 3 26-28%; SiO 2 7~8%; MgO 5~6%, alkalinity CaO / SiO 2 The value is 6-8; refining produces white slag; the aluminum composition of molten steel is adjusted, and aluminum is fed 3 times, and the aluminum-iron rare earth cored wire is fed; the silicon content of molten steel is 0.15-0.25%; : C: 0.038~0.045%, Si: 0.15~0.25%, Mn: 0.50~0.60%, P≤0.015%, S≤0.003%, Alt: 0.008~0.020%, the balance is iron and trace unavoidable impurities . T...

Embodiment 3

[0057] (1) Molten iron: reduce the sulfur content of the molten iron to less than 0.02% by means of pretreatment of the molten iron;

[0058] (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.

[0059] (3) LF Refining: Adjust refining incoming molten steel [Al] 0.02-0.04%, molten steel temperature ≥ 1550°C; add lime at 6-7Kg / ton, control slag composition to be CaO 54-56%, Al 2 o 3 25-30%; SiO 2 6~7%; MgO 5~7%, alkalinity CaO / SiO 2 The value is 8-9; white slag is produced by refining; the aluminum composition of molten steel is adjusted, the number of times of aluminum blending is 2 times, and the limestone cored wire is fed 400 meters; the silicon content of molten steel is 0.15-0.25%; the mass percentage of molten steel composition out of refining is controlled as: C : 0.038~0.045%, Si: 0.15~0.25%, Mn:...

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Abstract

The invention discloses a process for low-carbon silicon-controlled aluminum killed clean steel and belongs to the field of steel preparation. The production process comprises the following steps: (1)reducing the sulfur content of molten iron to 0.02% or below by means of molten iron pretreatment and the like; (2) an oxygen top-bottom combined blown converter is adopted, specifically, slag stop and tapping are carried out, and the end-point molten steel [O] of the converter is less than 600 ppm; (3) LF refining is carried out, specifically, the slag is controlled to comprise 55-60% of CaO, 35-40% of Al2O3, 2-4% of SiO2 and 5-7% of MgO, specifically, the alkalinity value of CaO / SiO2 is 20-26, refining is carried out to make white slag, the aluminum component of the molten steel is adjusted, and aluminum is dosed twice; (4) soft blowing and calming argon at the bottom of a steel ladle; (5) continuous casting is carried out; and (6) rolling steel. Compared with the prior art, the methodhas the advantages that the calcium treatment cost is saved, the problems that high-melting point aluminate is prone to flocculation and nitrogen increase are avoided, the forming performance of a steel plate 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 Thin Slab Continuous Casting Low-Cost High Formability Low-Carbon Aluminum Killed Clean Steel Process" (Application No.: 2018100961312). It specifically relates to the field of iron and steel metallurgy technology, especially a production technology for producing low-carbon aluminum-killed clean steel with high formability at low cost. Background technique [0002] Currently producing low-carbon (silicon-containing or silicon-controlled) aluminum-killed steel, the production process generally adopts molten iron→oxygen top-bottom combined blowing converter→LF refining→soft blowing of argon gas at the bottom of the ladle→calcium treatment→soft blowing of argon gas at the bottom of the ladle→thin plate Billet continuous casting→continuous rolling process. Among them, the calcium treatment process is specifically: feeding molten steel into metallic calcium solid cored...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C7/00C21C7/072C22C38/02C22C38/04C22C38/06
CPCC21C7/0006C21C7/0056C21C7/072C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06
Inventor 乔继纲
Owner RIZHAO STEEL HLDG GROUP
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