Aluminum content control method

A control method, a technology of aluminum content, applied in the field of steelmaking and refining, to achieve the effect of increasing production costs, simple control method, and easy implementation

Active Publication Date: 2020-12-18
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a control method of aluminum content, which is used to reduce the aluminum content in steel of the number of inclusions in ultra-low sulfur

Method used

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  • Aluminum content control method

Examples

Experimental program
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Effect test

Embodiment 1

[0043] The steel type is X70 pipeline steel, the tapping volume is 213t, and the production process is "converter + LF refining + VD refining + wire feeding + soft blowing".

[0044] (1) The content of dissolved aluminum [Al]s in molten steel at the end of LF refining is controlled at 0.071%, and the mass percentage of refining slag components after LF refining slag is: CaO%: 56.68%, Al 2 o 3 %: 26.79%, MgO %: 6.72%, SiO 2 %: 4.59%, (FeO%+MnO%): 0.66%, the amount of slag is 12.52Kg / t steel, the flow rate of bottom blowing argon gas is 2.50NL / (min·t steel) strong stirring desulfurization, LF refining is finished in molten steel The sulfur content of the product is reduced to 14ppm;

[0045] (2) Aluminum is not added to molten steel throughout the VD vacuum refining process. After VD refining, the dissolved aluminum [Al]s content in molten steel is controlled at 0.039%, and the deep vacuum stage of VD vacuum refining process is 2.00NL / (min· t steel) the amount of argon is blo...

Embodiment 2

[0049] The steel grade is E36-Z35, the tapping volume is 301t, and the production process is "converter + LF refining + VD refining + wire feeding + soft blowing".

[0050] (1) The content of dissolved aluminum [Al]s in molten steel at the end of LF refining is controlled at 0.082%, and the mass percentage of refining slag components after slagging is: CaO%: 53.64%, Al 2 o 3 %: 27.32%, MgO %: 7.32%, SiO 2 %: 7.14%, (FeO%+MnO%): 0.69%, the amount of slag is 10.49Kg / t steel, the flow rate of bottom blowing argon gas is 3.50NL / (min·t steel) strong stirring desulfurization, LF refining is finished in molten steel The sulfur content of the product is reduced to 20ppm;

[0051] (2) Aluminum is not added to the molten steel during the VD vacuum refining process. After the VD refining process, the dissolved aluminum [Al]s content in the molten steel is controlled at 0.035%, and the deep vacuum stage of the VD vacuum refining process is 2.00NL / (min· t steel) the amount of argon is b...

Embodiment 3

[0055] The steel grade is 45Mn2V, the tapping amount is 100t, and the production process is "electric furnace + LF refining + VD refining + wire feeding + soft blowing".

[0056] (1) The content of dissolved aluminum [Al]s in molten steel at the end of LF refining is controlled at 0.065%, and the mass percentage of refining slag components after slagging is: CaO%: 53.75%, Al 2 o 3 %: 28.23%, MgO %: 7.56%, SiO 2 %: 6.74%, (FeO%+MnO%): 0.66%, the amount of slag is 13.23Kg / t steel, the flow rate of bottom blowing argon gas is 3.50NL / (min·t steel) strong stirring desulfurization, LF refining is finished in molten steel The sulfur content is reduced to 15ppm;

[0057] (2) Aluminum is not added to molten steel throughout the VD vacuum refining process. After VD refining, the dissolved aluminum [Al]s content in molten steel is controlled at 0.022%, and the deep vacuum stage of VD vacuum refining process is 2.00NL / (min· t steel) the amount of argon is blown and stirred at the botto...

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Abstract

The invention discloses an aluminum content control method. The aluminum content control method is used for reducing the quantity of inclusions in ultra-low sulfur steel and controlling the aluminum content in the steel, and comprises the following steps that the slag amount is controlled in a primary smelting furnace and the slag adding amount is controlled in an LF; a refining reducing slag system is selected in the LF refining process so as to keep high dissolved aluminum content control in the LF refining process and at the end of the LF refining process; in the whole VD refining process,aluminum is forbidden to be supplemented into molten steel; under the LF refining and VD refining deep vacuum state, steel slag large bottom blowing flow stirring is carried out, it is guaranteed thatmolten steel, refining slag and inclusions react sufficiently, and after VD vacuum breaking, Ca line feeding treatment and soft blowing are carried out; and after the molten steel is rolled, the maximum inclusions are less than 20 microns, and the distribution density of various inclusions of 5-20 microns is 0.2-0.8/mm < 2 >.

Description

technical field [0001] The present application relates to the technical field of steelmaking and refining, in particular to a method for controlling aluminum content. Background technique [0002] Non-metallic inclusions in steel have an important impact on the performance and service life of steel. For example, aluminum oxide inclusions can cause surface defects in thin steel plates for automobiles and electrical products. For medium and thick plate products, non-metallic inclusions in steel The size, composition and distribution of inclusions mainly affect the toughness, Z-direction performance and hydrogen-induced crack resistance of the steel plate. Therefore, the number of non-metallic inclusions in steel should be reduced as much as possible to improve the performance and service life of steel. [0003] In the VD vacuum refining process, in order to promote the gas dissolved in the molten steel to quickly leave the molten steel, good kinetic conditions must be provide...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C7/076C21C7/072C21C7/064C21C7/10
CPCC21C7/0056C21C7/076C21C7/072C21C7/064C21C7/10Y02P10/20
Inventor 郝宁刘金刚朱国森朱志远杨荣光季晨曦李海波王国连高庞光胡显堂初仁生李战军杨赵军王宏宇周磊
Owner SHOUGANG CORPORATION
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