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Slagging method for preventing high-silicon-aluminum deoxidized steel bale from adhering slag

A deoxidized steel and high-silicon-aluminum technology, applied in the field of metallurgy, can solve the problems of increasing production costs, inability to remove slag, and uneven addition, so as to reduce production costs, reduce aluminum deoxidation products, and avoid sticky slag problems Effect

Pending Publication Date: 2022-07-12
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding slagging agent not only increases the production cost, but also cannot play the role of slag removal due to uneven addition, and there is still capping phenomenon in production. Adding slagging agent cannot fundamentally solve the problem of high silicon aluminum steel slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 200t converter-argon station-RH process to produce high silicon aluminum deoxidized steel:

[0036] The end temperature of converter blowing is 1665℃, the end point [O] is 0.066%, and aluminum alloy is added for deoxidation when the tapping reaches 1 / 5, and the addition amount is 0.60kg / t steel; one third of the tapping is added with silicon-manganese alloy for further removal. partial oxygen. When two-thirds of the converter is tapping, lime is added through the high-level silo, and the amount of lime added is 2.4kg / t steel. After adding lime, the bottom of the ladle is stirred with large argon gas, and the flow rate of argon blowing is 800L / min. Continue stirring with argon for 3 min. The slag blocking plate is used for tapping, and the measured slag thickness at the argon station is 40mm. After the ladle is transported to the argon station, in order to reduce the oxidation item of the top slag, aluminum-iron alloy is not added to the slag surface, and aluminum wire...

Embodiment 2

[0038] 200t converter-argon station-RH process to produce high silicon aluminum deoxidized steel:

[0039] The end temperature of converter blowing is 1655℃, the end point [O] is 0.060%, and aluminum alloy is added for deoxidation when the tapping reaches 1 / 5, and the addition amount is 0.40kg / t steel; one third of the tapping is added with silicon-manganese alloy for further removal. partial oxygen. When two-thirds of the steel is tapped in the converter, lime is added through the high-level silo, and the amount of lime added is 2.0kg / t steel. After adding lime, the bottom of the ladle is stirred with large argon gas, and the flow rate of argon blowing is 500L / min. Continue stirring with argon for 4 min. The slag blocking plate is used for tapping, and the measured slag thickness at the argon station is 35mm. After the ladle is transported to the argon station, in order to reduce the oxidation term of the top slag, aluminum-iron alloy is not added to the slag surface, and a...

Embodiment 3

[0041] 200t converter-argon station-RH process to produce high silicon aluminum deoxidized steel:

[0042] The end temperature of converter blowing is 1645℃, the end point [O] is 0.055%, and aluminum alloy is added for deoxidation when the tapping reaches 1 / 5, and the addition amount is 0.25kg / t steel; one third of the tapping is added with silicon-manganese alloy for further removal. partial oxygen. When two-thirds of the steel is tapped in the converter, lime is added through the high-level silo, and the amount of lime added is 1.5kg / t steel. After adding lime, the bottom of the ladle is stirred with large argon gas, and the flow rate of argon blowing is 400L / min. Continue stirring with argon for 5 min. The slag blocking plate is used for tapping, and the measured slag thickness at the argon station is 40mm. After the ladle is transported to the argon station, in order to reduce the oxidation item of the top slag, aluminum-iron alloy is not added to the slag surface, and a...

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PUM

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Abstract

The invention discloses a slagging method for preventing a ladle of high-silicon-aluminum deoxidized steel from adhering slag, which comprises the following steps: controlling the tapping temperature of a converter to be 1625-1665 DEG C, and adding 0.25-0.60 kg of aluminum alloy to carry out semi-deoxidation after one fifth of the tapping; adding silicon-manganese alloy to further remove part of oxygen after one third of tapping; lime is added after two thirds of converter tapping, and the adding amount of the lime is 1.2-2.4 kg / t steel; after lime is added, argon is adopted for stirring at the bottom of a steel ladle, and argon blowing stirring continues to be conducted after tapping is finished; after the steel ladle is conveyed to an argon station, aluminum wires are fed into the molten steel for deoxidation alloying, and the addition amount of the aluminum wires is 0.4-0.7 kg / t steel; after aluminum feeding is finished, stirring by adopting moderate-strength argon quantity to promote slag steel interface reaction; according to the method, the content of Al2O3 in the high-silicon-aluminum deoxidized top slag can be reduced, the slag bonding problem caused by the high content of Al2O3 in the top slag is avoided, meanwhile, the consumption of deoxidized aluminum alloy and the consumption of slagging lime are reduced, the requirements for smooth production and molten steel quality are met, and the production cost is obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a slag-making method for preventing slag sticking in large ladles of high-silicon-aluminum deoxidized steel. Background technique [0002] The composition of the top slag has a great influence on the cleanliness of molten steel and the control of inclusions, especially the oxidization of the top slag (FeO+MnO). Since (FeO) and (MnO) are unstable oxides, it is easy to supply oxygen to molten steel during refining or casting, resulting in secondary oxidation of molten steel. Therefore, in order to reduce the top slag to molten steel, generally in the tapping process or refining process, the slag (FeO+MnO) is controlled at a low level by adding a deoxidizing alloy (or deoxidizing agent). For aluminum deoxidized steel, it is mainly to add aluminum alloy to remove oxygen in slag. At the same time, in order to adsorb inclusions, high basicity reducing refining slag is ...

Claims

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Application Information

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IPC IPC(8): C21C5/36C21C7/06
CPCC21C5/36C21C7/06C21C7/0006C21C7/0056Y02P10/20
Inventor 朱万军林利平欧阳德刚孔勇江蒋兴平孙伟沈继胜张军刘婳
Owner 武汉钢铁有限公司
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