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Method for smelting ultra-low-carbon steel by using single-nozzle refining furnace

A single nozzle refining furnace and ultra-low carbon steel technology, applied in the field of ultra-low carbon steel smelting, can solve the problems of short service life of dip tube refractory, serious nodulation of dip tube, long processing time of molten steel, etc., and achieve short processing time , corrosion is not serious, and the effect of smelting time is short

Active Publication Date: 2012-10-03
北京北科三泰科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly solves the technical problems existing in the prior art, such as the double-suction-nozzle type dipping tube, the small circulating flow rate of which causes long molten steel treatment time, serious nodulation of the dipping tube, and short service life of the dipping tube refractory material; it provides A method for smelting ultra-low carbon steel in a single-nozzle refining furnace with short molten steel treatment time, low refractory material consumption, and less nodulation in dipped tubes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Under the initial conditions of controlling the thickness of the tapping slag = 30mm, the temperature of the molten steel arriving at the station at 1570°C, and the carbon content at the station C = 0.051%, the following steps are carried out:

[0024] Step 1: Deslagging the molten steel by blowing argon or nitrogen at first, the flow of argon or nitrogen is 5.5Nl / min per ton of steel, and when the exposed area of ​​molten steel reaches 50%, reduce the flow of argon or nitrogen to 0.6Nl / min ton of steel;

[0025] Step 2: Then insert the dipping tube of the single-nozzle furnace into the molten steel in step 1. The depth of the dipping tube of the single-nozzle furnace inserted into the molten steel is 400mm. At the same time, adjust the position of the oxygen lance to 3300mm;

[0026] Step 3: Vacuumize for 4 minutes to reach a vacuum degree of 78Pa. During the vacuuming process, argon blowing is carried out at the bottom of the ladle at the same time. The flow rate of ...

Embodiment 2

[0028] Under the initial conditions of controlling the thickness of the tapping slag = 50mm, the temperature of the molten steel at the arrival station at 1615°C, and the carbon content at the arrival station C = 0.041%, the following steps are carried out:

[0029] Step 1: Deslagging the molten steel by bottom blowing argon or nitrogen first, the flow rate of argon or nitrogen is 6Nl / min per ton of steel, when the exposed area of ​​molten steel reaches 40%, reduce the flow rate of argon or nitrogen to 0.8 Nl / min tons of steel;

[0030] Step 2: Then insert the dipping tube of the single-nozzle furnace into the molten steel in step 1. The depth of the dipping tube of the single-nozzle furnace inserted into the molten steel is 350mm. At the same time, adjust the position of the oxygen lance to 2500mm;

[0031] Step 3: Vacuumize for 5 minutes to reach a vacuum degree of 68pa. During the vacuuming process, argon blowing is carried out at the bottom of the ladle at the same time. ...

Embodiment 3

[0033] Under the initial conditions of controlling the thickness of the tapping slag = 50mm, the temperature of the molten steel at the arrival station at 1615°C, and the carbon content at the arrival station C = 0.07%, the following steps are carried out:

[0034] Step 1: Deslag the molten steel by bottom blowing argon or nitrogen first, the flow rate of argon or nitrogen is 7Nl / min ton of steel, when the exposed area of ​​molten steel reaches 60%, reduce the flow rate of argon or nitrogen to 0.7 Nl / min tons of steel;

[0035] Step 2: Then insert the dipping tube of the single-nozzle furnace into the molten steel in step 1. The depth of the dipping tube of the single-nozzle furnace inserted into the molten steel is 350mm. At the same time, adjust the position of the oxygen lance to 2500mm;

[0036] Step 3: Vacuumize for 6 minutes to reach a vacuum degree of 68pa. During the vacuuming process, argon blowing is carried out at the bottom of the ladle at the same time. The flow ...

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Abstract

The invention relates to a smelting method of ultra-low-carbon steel, which is an operating method for decarburizing by using a single-nozzle refining furnace. The invention is a smelting method for smelting ultra-low-carbon steel by using the single-nozzle refining furnace. The method is used for smelting the ultra-low-carbon steel with C of being less than or equal to 20ppm, and adjusts the inserting depth of a single-nozzle furnace dipping pipe, lance position of an oxygen lance, vacuum degree, oxygen supplying flow and eccentric bottom-blown argon of a steel ladle to stir molten steel under the vacuum condition by controlling the initial conditions of the thickness of a tapping slag layer, the temperature of arrived molten steel, the content of arrived carbon and the like so as to achieve the purpose of decarburization. The method has the following advantages that: 1. the treatment time of the molten steel is short, the refractory material consumption is low, and the scaffolding of the dipping pipe is little; and 2. the smelting time is short, the splashing is little, the consumption of sealing rings is less, the corrosion of the steel ladle is not serious, the cost is low andthe operation is simple.

Description

technical field [0001] The invention relates to a method for smelting ultra-low carbon steel, which is a decarburization operation method using a single nozzle refining furnace. Background technique [0002] At present, the methods of large-scale production of ultra-low carbon steel are mainly RH and VOD smelting methods. [0003] ① RH (developed by Ruhrstahl and Heraeus by vacuum circulation degassing method) adopts a double-nozzle type dipping tube, the molten steel in the ladle is inserted into the dipping tube and then vacuumed, and the method of oxygen supply under vacuum and argon supply by side blowing on the tube wall is used to smelt ultra-low carbon steel. Due to the adoption of double-suction-nozzle type dipping tubes in this method, the small circulating flow rate causes the problems of long processing time of molten steel, serious nodulation of dipping tubes, and short service life of dipping tube refractory materials. [0004] ②VOD (vacuum oxygen decarburizat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/068
Inventor 郭汉杰张鉴成国光刘良田杨学民赵元庆刘志龙
Owner 北京北科三泰科技发展有限公司
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