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Ultra-low carbon IF steel complex deoxidation method

A compound deoxidation and ultra-low carbon technology, applied in the field of molten steel deoxidation, can solve the problems of increased inclusion defects, increased inclusions, and affecting product quality, and achieve the effects of low cost, improved product quality, and reduced inclusion scrap rate

Inactive Publication Date: 2017-03-29
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, for the control of the oxygen content of IF steel at home and abroad, the method of adding aluminum particles to the molten steel for deoxidation is mainly used, and the deoxidation product is Al 2 o 3 , but because the aluminum is sometimes adjusted multiple times in the RH process, it directly affects the Al 2 o 3 The floating of inclusions, if the floating of impurities is not complete, it will lead to Al in molten steel such as automobile sheet steel 2 o 3 Increased inclusions, increased inclusion defects, affecting product quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this example, a 185-ton molten steel tank is used to refine and produce ultra-low carbon IF steel in RH.

[0027] After the RH vacuum decarburization and degassing treatment, the oxygen content of the molten steel was measured once to be 450ppm. According to the silicon content requirement of the finished steel Si≤0.02%, 40kg of silicon calcium barium iron was added; after 3 minutes of circulation, the oxygen was fixed at 361ppm, and 110kg of aluminum was added according to the oxygen content. The particles undergo final deoxygenation.

[0028] After adopting the above process, the molten steel is poured smoothly in the tundish without flocculation phenomenon, the total oxygen in the tundish is 0.0011%, and no inclusion defect is found.

Embodiment 2

[0030] In this example, a 250-ton molten steel tank is used to refine and produce ultra-low carbon IF steel in RH.

[0031] After the RH vacuum decarburization and degassing treatment, the oxygen content of the molten steel was determined to be 402ppm once. According to the silicon content requirements of the finished steel Si≤0.03%, 65kg of silicon calcium barium iron was added; after 3 minutes of circulation, the oxygen was fixed at 317ppm, and 130kg of aluminum was added according to the oxygen content. The particles undergo final deoxygenation.

[0032] After adopting the above process, the molten steel is poured smoothly in the tundish without flocculation phenomenon, and the total oxygen in the tundish is 0.0013%; no inclusion defect is found.

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Abstract

The invention relates to an ultra-low carbon IF steel complex deoxidation method. The method includes the following steps that (1) after RH vacuum decarburization and degassing treatment are completed, the complex deoxidizer Si-Ca-Ba-Fe is added for preliminary deoxidation according to the weight percentage content requirement of silicon in finished product IF steel; and (2) after the Si-Ca-Ba-Fe is added, RH clean circulation lasts for 3-5min, the molten steel oxygen content is measured, and then aluminum particles are added for final deoxidation according to the molten steel oxygen content based on a conventional deoxidation technology. Compared with the prior art, the ultra-low carbon IF steel complex deoxidation method has the beneficial effects that (1) Al2O3 impurities in molten steel can be reduced, and floating elimination of the Al2O3 impurities is facilitated; (2) the composite deoxidation product mainly refers to a composite occluded foreign substance of BaO, CaO, Al2O3 and the like, the occluded foreign substance can float easily, the size is small, water gaps cannot be blocked, and smooth pouring is guaranteed; (3) the cleanliness of the molten steel is improved obviously, the quality of automobile body sheets and other products with high surface quality requirements is effectively improved, the included ejection rate is lowered, and the whole performance of IF steel is improved; and (4) operation is simple and easy to implement, and cost is low.

Description

technical field [0001] The invention relates to a method for deoxidizing molten steel, in particular to a method for composite deoxidizing ultra-low carbon IF steel using RH vacuum treatment. Background technique [0002] At present, for the control of the oxygen content of IF steel at home and abroad, the method of adding aluminum particles to the molten steel for deoxidation is mainly used, and the deoxidation product is Al 2 o 3 , but because the aluminum is sometimes adjusted multiple times in the RH process, it directly affects the Al 2 o 3 The floating of inclusions, if the floating of impurities is not complete, it will lead to Al in molten steel such as automobile sheet steel 2 o 3 Increased inclusions and inclusion defects will affect product quality. Contents of the invention [0003] The invention provides a method for composite deoxidation of ultra-low carbon IF steel. Before adding aluminum particles for deoxidation, a composite deoxidizer, silicon calciu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/06C21C7/068
Inventor 王军吴春杰林洋于守巍孙涛崔丽丽李西岱舒耀程科兵
Owner ANGANG STEEL CO LTD
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