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Steelmaking method of sulfur-containing and aluminum-containing steel

A technology of aluminum steel and sulfur content, which is applied in the steelmaking field of sulfur-containing and aluminum-containing steel, can solve the problems of continuous casting nozzle nodules, difficult control of sulfur content, and high oxygen content of molten steel, so as to avoid nodules, reduce oxygen content, Effect of stabilizing sulfur content

Active Publication Date: 2020-08-04
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

[0003] However, at present, sulfur-containing and aluminum-containing steels have been difficult to control the sulfur content in steelmaking production, high oxygen content in molten steel, and due to Al in the pouring process of molten steel. 2 o 3 Inclusions or CaS are prone to nodules in the continuous casting nozzle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A steelmaking method for sulfur-containing and aluminum-containing steel, comprising the steps of:

[0027] (1) Converter smelting: The molten iron pre-desulfurization process is not carried out before the converter smelting process, and the sulfur content of the molten iron entering the converter is 0.035%; then the converter smelting process is carried out, the carbon content at the end of the converter is 0.20%, the oxygen content at the end is 0.0400%, and the sulfur content at the end 0.030%;

[0028] (2) Tapping: After the converter smelting process is completed, aluminum nuggets or ferro-aluminum are added for deoxidation during the tapping process, and ferrosilicon and ferromanganese are added for alloying. The amount of aluminum nuggets or ferro-aluminum added is 1.5kg / ton of molten steel , Add ferrosilicon 300kg / ton molten steel and ferromanganese 1000kg / ton molten steel.

[0029] (3) Refining in LF furnace: LF furnace adopts the full bottom blowing argon mod...

Embodiment 2

[0035] A steelmaking method for sulfur-containing and aluminum-containing steel, comprising the steps of:

[0036] (1) Converter smelting: The molten iron pre-desulfurization process is not carried out before the converter smelting process, and the sulfur content of the molten iron entering the converter is 0.045%; then the converter smelting process is carried out, the carbon content at the end point of the converter is 0.10%, the oxygen content at the end point is 0.0300%, and the sulfur content at the end point 0.035%;

[0037] (2) Tapping: After the converter smelting process is completed, aluminum nuggets or ferro-aluminum are added for deoxidation during the tapping process, and ferrosilicon and ferromanganese are added for alloying. The amount of aluminum nuggets or ferro-aluminum added is 2.0kg / ton of molten steel , Add ferrosilicon 310kg / ton molten steel and ferromanganese 900kg / ton molten steel.

[0038] (3) Refining in LF furnace: The LF furnace adopts the full bot...

Embodiment 3

[0044] A steelmaking method for sulfur-containing and aluminum-containing steel, comprising the steps of:

[0045] (1) Converter smelting: The molten iron pre-desulfurization process is not carried out before the converter smelting process, and the sulfur content of the molten iron entering the converter is 0.040%; then the converter smelting process is carried out, the carbon content at the end point of the converter is 0.20%, the oxygen content at the end point is 0.0350%, and the sulfur content at the end point 0.040%;

[0046] (2) Tapping: After the converter smelting process is completed, aluminum nuggets or ferro-aluminum are added for deoxidation during the tapping process, and ferrosilicon and ferromanganese are added for alloying. The amount of aluminum nuggets or ferro-aluminum added is 1.8kg / ton of molten steel , Add ferrosilicon 305kg / ton molten steel and ferromanganese 980kg / ton molten steel.

[0047] (3) Refining in LF furnace: The LF furnace adopts the full bot...

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PUM

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Abstract

The invention relates to the technical field of steelmaking, in particular to a steelmaking method of sulfur and aluminum-containing steel. The steelmaking method of the sulfur and aluminum-containingsteel comprises the following steps: (1) converter smelting: prohibiting the molten iron pre-desulfurization process before the converter smelting process, controlling the sulfur content of molten iron entering a converter not to be less than 0.035 percent and then performing the converter smelting process; (2) steel tapping: adding an aluminum block or aluminum iron for deoxidization and addingferrosilicon and ferromanganese for alloying; (3) LF furnace refining: adding active lime, fluorite and aluminum pellets to make refining slag, feeding a silicon-calcium wire of 0.8-1.2 m / ton into molten steel at the LF refining later stage and prohibiting the addition of aluminum at the LF refining later stage; (4) RH vacuum: (5) sulfur addition: adding FeS in the molten steel, so that the content of S in the steel is that the required standard sulfur percentage content deducts 0.002 percent; (6) soft blowing. The steelmaking method provided by the invention has the benefits that not only canthe content of the sulfur in the sulfur and aluminum-containing steel be controlled stably, but also the nozzle nodulation phenomenon is avoided, and further the pourability of the molten steel is enhanced.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a steelmaking method for sulfur-containing and aluminum-containing steel. Background technique [0002] Sulfur-containing aluminum-containing steel is more and more used in mechanical parts due to its good cutting performance and toughness. With the rapid development of the automobile industry, the demand for sulfur-containing aluminum-containing steel is also increasing . [0003] However, at present, sulfur-containing and aluminum-containing steels have been difficult to control the sulfur content in steelmaking production, high oxygen content in molten steel, and due to Al in the pouring process of molten steel. 2 o 3 Inclusions or CaS are prone to nodulation at the continuous casting nozzle. Contents of the invention [0004] In order to solve the above problems, the object of the present invention is to provide a steelmaking method for sulfur-containing and aluminum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C21C7/06C22C33/04C22C38/02C22C38/04C22C38/06
CPCC21C7/0006C21C7/06C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06
Inventor 张贤忠任安超丁礼权张帆夏艳花鲁修宇李建华仇东丽桂江兵周勇
Owner 武汉钢铁有限公司