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Method for smelting low-phosphorous molten steel by utilizing semisteel

A technology of steel smelting and molten steel, which is applied in the direction of improving process efficiency and manufacturing converters, etc. It can solve problems such as complex formula, insufficient dephosphorization depth, poor control of end-point phosphorus return, etc., and achieves the effect of easy control and reduction of phosphorus content

Inactive Publication Date: 2011-02-02
PANZHIHUA IRON AND STEEL +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dephosphorization and sulfur formulation of this method are complex and the depth of dephosphorization is not enough, and the situation of rephosphorization at the end point is not easy to control
[0011] It can be seen from the above that the above-mentioned prior art still has deficiencies for the deep dephosphorization of molten iron and even semi-steel (phosphorus content is less than 0.010%, or even lower) and the control of end-point rephosphorization of molten steel. Dephosphorized low-phosphorus steel production method

Method used

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  • Method for smelting low-phosphorous molten steel by utilizing semisteel

Examples

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Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 uses the method of the present invention to smelt low-phosphorus molten steel

[0035] Prepare to extract vanadium semi-steel after desulfurization and slag removal, its composition is: C 3.7%, Mn 0.032%, V 0.03%, S 0.008%, P 0.067%, the balance is Fe, the above are weight percentages, and the sum of percentages is 100%; then add 140t of the semi-steel into the converter, add the first batch of slagging agents (lime 3500kg, high magnesium lime 2000kg, composite slag 3050kg) into the converter after the semi-steel is mixed into the converter, and the alkalinity in the converter is controlled At 2.3~2.8, blowing for 5 minutes (oxygen supply intensity: 3.5~3.8m 3 / min.t -1 Semi-steel, bottom blowing argon or nitrogen intensity 0.05~0.08m 3 / min.t -1 Stirring effect), then shake the converter for slagging, and then add the second batch of slagging agent (lime 4000kg, high magnesium lime 2500kg, composite slag 1910kg) for oxygen blowing (oxygen supply intensi...

Embodiment 2

[0036] Embodiment 2 uses the method of the present invention to smelt low-phosphorus molten steel

[0037] Prepare the vanadium-extracted semi-steel after desulfurization and slag removal, its composition is: C 3.7%, Mn 0.032%, V 0.03%, S 0.008%, P0.067%, the balance is Fe, and the above are weight percentages, percentages The sum is 100%; then 140t of the semi-steel is blended into the converter, and after the semi-steel is blended into the converter, the first batch of slag-forming agents (3200kg of lime, 1800kg of high-magnesia lime, and 2770kg of composite slag) are added to the converter. The temperature is controlled at about 2.5 (2.3~2.8), blowing for 5 minutes (oxygen supply intensity: 3.5~3.8m 3 / min.t -1 Semi-steel, bottom blowing argon or nitrogen intensity 0.05~0.08m 3 / min.t -1 Stirring effect), shake the converter for slagging, and then add the second batch of slagging agent (lime 3800kg, high magnesium lime 2300kg, composite slag 1800kg) for oxygen blowing (o...

Embodiment 3

[0038] Embodiment 3 uses the method of the present invention to smelt low-phosphorus molten steel

[0039] Prepare the vanadium-extracted semi-steel after desulfurization and slag removal, its composition is: C 3.7%, Mn 0.032%, V 0.03%, S 0.008%, P0.067%, the balance is Fe, and the above are weight percentages, percentages The sum is 100%; then 140t of the semi-steel is blended into the converter, and after the semi-steel is blended into the converter, the first batch of slagging agents (lime 3000kg, high-magnesia lime 1500kg, and composite slag 2520kg) are added to the converter. Controlled at 2.3-2.8, blowing for 5 minutes (oxygen supply intensity: 3.5-3.8m 3 / min.t -1 Semi-steel, bottom blowing argon or nitrogen intensity 0.05~0.08m 3 / min.t -1 Stirring effect), shake the converter for slagging, and then add the second batch of slagging agent (lime 3500kg, high magnesium lime 2000kg, composite slag 1670kg) for oxygen blowing (oxygen supply intensity: 3.5 ~ 3.8m 3 / min.t...

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PUM

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Abstract

The invention belongs to the metallurgical field, particularly relating to a method for smelting low-phosphorous molten steel by utilizing semisteel. The technical problem solved by the invention is to lower the phosphorus content of the final molten steel so as to be beneficial for producing the low phosphorus steel on the premise of ensuring converter decarburization effect. The technical scheme for solving the technical problem in the invention is to provide the method for smelting the low-phosphorous molten steel by utilizing the semisteel. The method comprises the following steps: mixing the semisteel subjected to desulfuration and vanadium extraction into a converter; adding the first batch of steelmaking slagging agent; converting for 4-6 minutes in the converter; slagging; and adding the second batch of slagging agent for converting. By adopting the method of the invention, the final molten steel can be obtained, wherein, the phosphorus content is less than or equal to 0.006%; and the dephosphorization rate of the converter achieves over 92.5%. On the premise of not influencing steelmaking dephosphorization and decarburization tasks, the method of the invention lowers the phosphorus content of the final molten steel, and provides important technical support for producing the low phosphorus steel.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for smelting low-phosphorus molten steel by using semi-steel. Background technique [0002] Phosphorus is a harmful impurity in steel, which is easy to segregate at the grain boundary, causing the steel to be "cold and brittle", and significantly reducing the low temperature impact toughness of the steel. In recent years, as users have more and more stringent requirements on steel properties, higher requirements have been put forward for the phosphorus content of many steel types; 1. Tinplate requires phosphorus to be less than 0.010%; some aviation, atomic energy, and corrosion-resistant pipeline steels require finished phosphorus to be less than 0.005%. At present, the main existing technologies for smelting low-phosphorus steel grades and semi-steel smelting low-phosphorus steel grades by using molten iron are as follows: [0003] (1) CN1995403 converter proces...

Claims

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Application Information

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IPC IPC(8): C21C7/076C21C5/28C21C7/00
CPCY02P10/20
Inventor 蒋龙奎何为戈文荪李桂军陈永杨素波李青春张彦恒梁新腾曾耀先
Owner PANZHIHUA IRON AND STEEL
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