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Method for deoxidizing in RH (Relative Humidity) vacuum furnace

A vacuum furnace and vacuum treatment technology, used in the production of low carbon aluminum killed steel and ultra-low carbon steel, deoxidized in RH vacuum furnace, and in the field of deoxidation in RH vacuum furnace, to improve purity, reduce production costs, and reduce inclusions Effect

Active Publication Date: 2014-02-26
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

Therefore, even if the carbon content in molten steel is used for deoxidation under vacuum conditions, the excess oxygen content before alloying is still high and cannot meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method of deoxidizing in RH vacuum furnace, its steps:

[0032] 1) After smelting in the converter, the molten steel directly enters the RH vacuum furnace for vacuum treatment, and the tapping temperature is increased by 10°C compared with the conventional tapping temperature.

[0033] ) Add the recarburizer to the RH vacuum furnace for deoxidation: the vacuum in the furnace is 5KPa; 6 minutes before the vacuum treatment, all the recarburizers to be added have been added; the temperature drop of the recarburizer is 3℃ Per minute; the amount of recarburizer added is calculated according to the following formula: Known: T0= 1622℃, T rise=13℃, T fall=35℃, T target=1590℃, O arrival=610ppm,

[0034] O before alloying = 230ppm, C arrival = 355 ppm into the following formula respectively,

[0035] m=(T0+ T up-T down-T target) ×0.02 kg / t or

[0036] m=[(O arrives at the station-O before alloying +200)÷133-C arrives at the station]×0.0012 kg / t

[0037] After calculation, under 20...

Embodiment 2

[0042] A method of deoxidizing in RH vacuum furnace, its steps:

[0043] 1) After being smelted in the converter, the molten steel directly enters the RH vacuum furnace for vacuum treatment, and the tapping temperature is increased by 15°C compared with the conventional tapping temperature;

[0044] 2) Add the recarburizer to the RH vacuum furnace for deoxidation: the vacuum in the furnace is 6KPa; 6 minutes before the vacuum treatment, all the recarburizers to be added have been added; the deoxidizing temperature drop of the recarburizer is 4kg / ℃; the amount of recarburizer added is calculated according to the following formula: Known: T0= 1627℃, T rise=17.5℃, T fall=35℃, T target=1590℃, O arrival=720ppm,

[0045] O before alloying = 230ppm, C arrival = 305ppm into the following formula respectively,

[0046] m=(T0+ T up-T down-T target) ×0.02 kg / t or

[0047] m=[(O arrives at the station-O before alloying +200)÷133-C arrives at the station]×0.0012 kg / t

[0048] After calculati...

Embodiment 3

[0053] A method of deoxidizing in RH vacuum furnace, its steps:

[0054] 1) After being smelted in the converter, the molten steel directly enters the RH vacuum furnace for vacuum treatment, and the tapping temperature is increased by 12°C compared with the conventional tapping temperature;

[0055] 2) Add the recarburizer to the RH vacuum furnace for deoxidation: the vacuum in the furnace is 6KPa; 6 minutes before the vacuum treatment, all the recarburizers to be added have been added; the deoxidizing temperature drop of the recarburizer is 4kg / ℃; the amount of recarburizer added is calculated according to the following formula: Known: T0= 1625℃, T rise=17℃, T fall=35℃, T target=1590℃, O arrival=690ppm,

[0056] O before alloying = 230ppm, C arrival = 300ppm into the following formula respectively,

[0057] m=(T0+ T up-T down-T target) ×0.02 kg / t or

[0058] m=[(O arrives at the station-O before alloying +200)÷133-C arrives at the station]×0.0012 kg / t

[0059] After calculation...

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Abstract

The invention discloses a method for deoxidizing in an RH (Relative Humidity) vacuum furnace. The method comprises the steps of smelting in a converter, and then, directly treating molten steel in the RH vacuum furnace; adding a carburant for deoxidizing into the vacuum furnace, wherein the addition amount of the carburant is calculated according to the formula: m=(T0+Tascend-Tdescend-Ttarget)*0.02kg / ton steel or m=[(Odestination-Obefore alloying+200) / 1.33-Cdestination]*0.0012kg / t, the addition amounts are respectively calculated according to the both formulas, and finally, the smaller value is considered as the addition amount; when the calculated m value does not exceed 20kg, finishing adding at one step; when the m value exceeds 20kg, adding in batches, wherein the highest addition amount in each batch is 20kg, the adding time interval is not shorter than 10s, and the adding process is finished within 6min; carrying out the following processes as usual. According to the invention, the sharp reaction spray can not be generated because the carburant is added under a vacuum condition, thus the oxygen content before the molten steel is alloyed can be reduced through subjecting the carburant and oxygen in the molten steel to reaction, the purity of the molten steel can be increased, and the consumption of aluminum cut wire shots in every ton of steel can be reduced to below 1.1kg.

Description

technical field [0001] The invention relates to a method for removing harmful elements in molten steel smelting, in particular to a method for deoxidizing in an RH vacuum furnace, and is especially suitable for deoxidizing in an RH vacuum furnace when producing low-carbon aluminum-killed steel and ultra-low-carbon steel method. Background technique [0002] When the converter produces low-carbon aluminum-killed steel and ultra-low carbon steel, the tapping carbon is usually controlled at 0.03%~0.06%, and the oxygen content corresponding to tapping is generally 400~800ppm, and the tapping oxygen is higher in the case of operating errors. In the process mode without pre-deoxidation for tapping, the oxygen content in the vacuum furnace is usually greater than 400ppm. Under the traditional RH vacuum refining process, the carbon-oxygen reaction during the vacuum cycle can obtain a lower carbon content level, but the oxygen content of the molten steel with high oxygen content bef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/10
Inventor 许成英李海洋张春胜杨文军宋泽啓林利平肖汉波沈武邓品团彭长波
Owner 武汉钢铁有限公司
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