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Steelmaking method of sulfur and aluminum-containing steel

Active Publication Date: 2019-01-04
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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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
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