Method for controlling ratio of calcium to aluminum of auto sheet ladle top slag to be 1.2-1.8

A technology of top slag calcium aluminum and automobile plate, which is applied in the field of iron and steel smelting, can solve the problem of unsatisfactory control of the top slag calcium aluminum ratio, and achieve the effect of reducing adverse effects and improving the qualified rate of finished products

Active Publication Date: 2017-05-10
BEIJING SHOUGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the process of realizing the technical solution of the invention in the embodiment of the application, the inventors of the present application found that the above-mentioned technology has at least the following technical problems: a considerable number of enterprises use pre-melted slag, composite slag modifier, etc. to adjust slag, but control the top slag The calcium-aluminum ratio of 1.2-1.8 is not ideal, therefore, it is necessary to find a method to control the calcium-aluminum ratio of the top slag of the automobile plate ladle to 1.2-1.8

Method used

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  • Method for controlling ratio of calcium to aluminum of auto sheet ladle top slag to be 1.2-1.8

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Embodiment 1

[0059] This embodiment provides a method for controlling the calcium-aluminum ratio of the top slag of the automobile plate ladle to 1.2-1.8, including:

[0060] Step S1: Control the oxygen activity at the end of the converter, control the carbon-oxygen product C-O in the whole furnace of the converter to an average of ≤0.0023%, and control the oxygen activity at the end of the converter to 450-650ppm;

[0061] Step S2: Control the basicity of the final slag of the converter, control the target basicity of the sub-lance model at 3.8, and control the CaO content of the final slag of the converter at 48.2%-51.3%;

[0062] Step S3: controlling the amount of slag discharged from the steel tapping of the converter;

[0063] Step S4: Controlling the amount of slag sticking to the steel ladle of the automobile sheet;

[0064] Step S5: Controlling the type, amount and method of the top slag modifier of the automobile sheet and ladle;

[0065] Step S6: Control the flow rate of the bo...

Embodiment 2

[0108] The difference between this embodiment and Embodiment 1 is that the number of bottom blowing elements described in step SA11 is changed from 12 in the prior art to 4. In step SA43, the post-furnace on-line auto sheet ladle baking is increased, and the proportion of auto sheet steel grades using the number of auto sheet ladles with a baking temperature ≥ 1050° C. is increased from 30% in the prior art to 79.8%. In step S51, the post-furnace slag modifier in the prior art is changed to bauxite, small lime, and high-calcium aluminum slag balls by adding materials such as pre-melted slag, small-grained lime, and high-calcium-aluminum slag balls to optimize the slag modifier materials. In step S52, the amount of slag modifier material added in the prior art is 500Kg of pre-melted slag, 100Kg of small-grained lime and 70Kg of high-calcium-aluminum slag balls, and changed to dynamically adjusted bauxite, small-grained lime and high-calcium-aluminum slag balls ,

[0109] The ...

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Abstract

The invention discloses a method for controlling the ratio of calcium to aluminum of auto sheet ladle top slag to be 1.2-1.8. The method comprises the following steps that terminal oxide activity of a convertor is controlled, and end slag basicity of the convertor is controlled; the steel tapping slag quantity of the convertor is controlled, and the ladle slag adhesion quantity of an auto sheet is controlled; the material type, the adding quantity and the mode of a modification agent of auto sheet ladle top slag are controlled, and the bottom blowing flow and gas closing time of auto sheet ladle are controlled; and finish of RH slag sampling operation is controlled, and the ratio of the calcium to aluminum of the auto sheet ladle top slag to be 1.2-1.8 is controlled. According to the embodiment, through the method for controlling the ratio of the calcium to aluminum of the auto sheet ladle top slag to be 1.2-1.8, the technical problem that in the prior art, the ratio of the calcium to aluminum of top slag cannot reach 1.2-1.8 is solved, the quantity of top slag TFe is lowered, and the qualification rate of finished products is improved.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a method for controlling the calcium-aluminum ratio of the top slag of an automobile plate ladle to 1.2-1.8. Background technique [0002] With the development of industrial technology, the quality requirements for steel are becoming more and more stringent, especially for the purity of steel. Especially for automobile sheet steel, because of its high strength and good deep drawing performance, it has high requirements on surface quality, so it is very necessary to control the size and quantity of inclusions in molten steel. The consensus reached in the smelting of automobile sheet steel at home and abroad: reasonable control of the calcium-aluminum ratio of the top slag is beneficial to the control of inclusions. Iron and steel company Thyssen believes that the reasonable range of calcium-aluminum ratio is 1.2-1.8 (that is, CaO / Al 2 o 3 ), the ratio of calcium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36C21C5/34C21C7/10C21C7/076
CPCC21C5/34C21C5/36C21C7/076C21C7/10Y02P10/20
Inventor 孙亮彭开玉胡卫东刘风刚郭玉明张勇王东
Owner BEIJING SHOUGANG CO LTD
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