Method for producing ultra-low phosphorus steel in argon blowing station by using premelted calcium ferrite to refine molten steel outdoors

A technology for refining ultra-low phosphorus steel outside the furnace, which is applied in the field of metallurgy, which can solve the problems of insufficient utilization of converter productivity, long smelting time, and reduced scrap steel volume, achieve dephosphorization efficiency and stability, reduce smelting intensity, and reduce oxygen. consumption effect

Inactive Publication Date: 2013-01-16
LIAONING TIANHE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most steel mills adopt the "double slag method", that is, two slag making methods are used in the converter smelting; or the "duplex method", that is, the molten iron is smelted in one converter for half the time and then poured into another converter to continue smelting. The disadvantages of these two methods are that the process is complex, the smelting time is long, and the productivity of the converter cannot be fully utilized.
Another way is to carry out "three removals" on molten iron in advance, that is, desiliconization, desulfurization, and dephosphorization. For example, Japanese iron and steel enterprises have the disadvantages of requiring more equipment, large investment, complicated process, and large heat loss. The temperature of molten iron after "three removals" is low, which greatly reduces the amount of steel scrap added during converter smelting
Therefore, in order to produce these low-phosphorus and ultra-low-phosphorus steels, conventional converter smelting methods can no longer meet the phosphorus requirements of these steel types, so it is necessary to study the method of assisting dephosphorization by refining outside the furnace, so as to realize the production of ultra-low phosphorus steels

Method used

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Examples

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Effect test

Embodiment 1

[0033] After the converter smelting is completed, the phosphorus content at the end of the converter is controlled below 0.03%, the tapping temperature is controlled at about 1580°C, the molten steel is not deoxidized during the tapping process, and slag blocking treatment is used during the tapping process; Add pre-melted calcium ferrite to the ladle twice with the steel flow, add half of the pre-melted calcium ferrite when the tapping is 1 / 3, add the remaining half of the pre-melted iron when the tapping is 2 / 3 The amount of calcium ferrite and pre-melted calcium ferrite is controlled at 5Kg tons of steel, and the particle size is controlled at 0.1mm~100mm; 30 ~ 50NL / min, the processing time is controlled at 12 ~ 15min; use the slag remover to remove the slag on the surface of the molten steel after dephosphorization, and then add a ladle covering agent of 2Kg / ton of steel; Temperature adjustment treatment, the temperature of molten steel should be controlled at 1570 ° C ~ 1...

Embodiment 2

[0035] After the converter smelting is completed, the phosphorus content at the end of the converter is controlled below 0.03%, the tapping temperature is controlled at about 1620°C, the molten steel is not deoxidized during the tapping process, and the slag blocking treatment is adopted during the tapping process; Add pre-melted calcium ferrite to the ladle twice with the steel flow, add half of the pre-melted calcium ferrite when the tapping is 1 / 3, add the remaining half of the pre-melted iron when the tapping is 2 / 3 The amount of calcium ferrite and pre-melted calcium ferrite is controlled at 8Kg / ton of steel, and the particle size is controlled at 0.1mm~100mm; after the steel is tapped, the ladle is transported to the argon blowing station, and the molten steel is blown and stirred with argon, and the flow of argon is controlled At 80-100NL / min, the processing time is controlled at 9-12min; use the slag remover to remove the slag on the surface of the molten steel after de...

Embodiment 3

[0037]After the converter smelting is completed, the phosphorus content at the end of the converter is controlled below 0.03%, the tapping temperature is controlled at about 1650°C, the molten steel is not deoxidized during the tapping process, and the slag blocking treatment is adopted during the tapping process; Add pre-melted calcium ferrite to the ladle twice with the steel flow, add half of the pre-melted calcium ferrite when the tapping is 1 / 3, add the remaining half of the pre-melted iron when the tapping is 2 / 3 The amount of calcium ferrite and pre-melted calcium ferrite is controlled at 10Kg ton of steel, and the particle size is controlled at 0.1mm~100mm; 150-200NL / min, the processing time is controlled at 7-9min; use the slag remover to remove the slag on the surface of the molten steel after dephosphorization, and then add 5Kg tons of steel ladle covering agent; adjust the molten steel in the refining furnace Temperature treatment, the temperature of molten steel s...

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Abstract

The invention provides a method for producing ultra-low phosphorus steel in an argon blowing station by using the premelted calcium ferrite to refine the molten steel outdoors, mainly comprising the following steps: tapping steel from a converter, refining in the argon blowing station to dephosphorize deeply, slagging, adjusting temperature, stirring, deoxidizing, refining, alloying and casting continuously. By using the method to dephosphorize deeply, the dephosphorization rate can be more than 80%, the content of phosphorus in the molten steel is controlled below 0.003% stably, the dephosphorization efficiency is high and stable, the smelting intensity of the converter is reduced, the service life of the converter is prolonged, the consumption of lime, oxygen and iron and steel materials is reduced, the electric energy is saved, and the metal yield is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and is used for removing phosphorus in steel by using pre-melted calcium ferrite in the process of refining outside the furnace, especially in the process of refining molten steel outside the furnace using pre-melted calcium ferrite in an argon blowing station. Method for producing ultra-low phosphorus steel. Background technique [0002] Phosphorus is usually a harmful element in steel, because the segregation of phosphorus in steel is relatively serious, which deteriorates the toughness of steel and produces "cold brittleness", especially at low temperature conditions, it is more likely to occur "cold brittleness". Phosphorus segregation can also cause anisotropy of steel, reduce welding performance, and cause corrosion fatigue of stainless steel, so it should be strictly controlled. In traditional technology, the phosphorus in steel is generally required to be controlled below 0.02%. Howeve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064
CPCY02P40/40
Inventor 陈云天
Owner LIAONING TIANHE TECH
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