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A control method of oxide inclusions in ultra-low carbon steel

A technology of ultra-low carbon steel and control method, which is applied in the direction of manufacturing converters, etc., to achieve the effect of remarkable and improved quality of finished products

Active Publication Date: 2020-11-17
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this stage, the LD-RH-CC process is widely used to produce ultra-low carbon steel. The oxygen in the finished product can be controlled to less than 20ppm or even lower. The total amount of inclusions in the corresponding steel has reached an extremely low level, but there are still a large number of cold-rolled finished products. Residual Al from steel 2 o 3 Steel blockage caused by inclusions

Method used

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  • A control method of oxide inclusions in ultra-low carbon steel
  • A control method of oxide inclusions in ultra-low carbon steel

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Embodiment 1

[0044] Converter blowing ends, [C] = 280ppm, [O] = 550ppm; slag blocking tapping, lime 3.32kg / t steel is added at the beginning of tapping, and aluminum slag 0.87kg / t steel is added at the end; ladle top slag composition before vacuum treatment (wt%FeO)+(wt%MnO)≤7.40, [(wt%CaO)+(wt%MgO)] / (wt%Al 2 o 3 )=1.72, the slag thickness is 118mm. After the vacuum decarburization is completed, Al is added to the molten steel for deoxidation and alloying, and the composition of the molten steel is adjusted to the specification range, [C]=20ppm, [Si]=0.01, [Mn]=0.65, [S]=120ppm, [Al ]=0.045, [Ti]=0.004, the molten steel circulates for 6.8 minutes; after the rare earth is added, the molten steel circulates for 4.2 minutes, the refining is completed, continuous casting, followed by hot rolling, pickling and cold rolling. Apex-Utral55 scanning electron microscope was used to count the inclusions in the slab, REM / T.O=1.75.

[0045] Embodiment 1 Process effect: For the judgment of the final ...

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Abstract

A method for controlling oxide inclusions in ultra-low carbon steel, comprising the steps of: 1) smelting, converter smelting, ensuring molten steel [O]=450-600ppm, [C]=0.01-0.05% when blowing is stopped; tapping Ensure that the ladle slag thickness is ≤50mm, add lime 2.0-5.0kg / t steel in the early stage of tapping, and use Al-based modifier 0.5-2kg / t steel in the final stage to modify and deoxidize the ladle top slag, so that the ladle top slag [( wt%CaO)+(wt%MgO)] / (wt%Al 2 o 3 ) = 1.4‑1.9, oxidizing components (wt% FeO) + (wt% MnO) ≤ 8; 2) vacuum decarburization treatment, vacuum decarburization treatment in RH furnace; after vacuum decarburization treatment, add Al to molten steel Deoxidation and alloying are carried out, and the pure circulation time of the molten steel is longer than 6 minutes; then the rare earth metal Ce is added, the pure circulation of the molten steel is 2-10 minutes, and the vacuum treatment is completed. The control method of the invention reduces the harm of residual inclusions in steel, improves the surface quality of cold-rolled finished products, and increases the sealing rate of cold-rolled finished steel.

Description

technical field [0001] The invention relates to a steelmaking process, in particular to a method for controlling oxide inclusions in ultra-low carbon steel. Background technique [0002] With the advancement of technology, users have higher and higher requirements for steel quality. For ultra-low carbon steel, there has been a demand for cold-rolled finished plates as thin as 0.05mm. From the point of view of smelting, it is necessary to reduce the total amount of inclusions in the steel to an extremely low level and control the presence of no large particle inclusions in the matrix. From the point of view of inclusion characteristics control, the hazards of inclusions remaining in steel must be reduced as much as possible. At this stage, the LD-RH-CC process is widely used to produce ultra-low carbon steel. The oxygen in the finished product can be controlled to less than 20ppm or even lower. The total amount of inclusions in the corresponding steel has reached an extreme...

Claims

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Application Information

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IPC IPC(8): C21C5/35C21C7/10C21C7/068
CPCC21C5/35C21C7/068C21C7/10C21C7/0006C21C7/06
Inventor 胡汉涛马志刚王俊凯薛菲林顺财
Owner BAOSHAN IRON & STEEL CO LTD
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