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

A single-mouth refining furnace, ultra-low hydrogen technology, applied in the smelting field of ultra-low hydrogen steel, can solve the problems of low consumption of refractory material of dipping pipe, short service life of refractory material of dipping pipe, serious nodules in vacuum chamber, etc., and achieve smelting time The effect of short, short processing time and less nodules in the vacuum chamber

Active Publication Date: 2011-11-09
北京北科三泰科技发展有限公司
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Problems solved by technology

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

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

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Effect test

Embodiment 1

[0020] Under the initial conditions of controlling the thickness of tapping slag = 30mm, the temperature of molten steel arriving at the station at 1570°C, and the hydrogen content at the station at H = 0.0008%, the following steps are carried out:

[0021] Step 1: Deslagging the molten steel by blowing argon or nitrogen at the bottom, the flow rate of argon or nitrogen is 5NL / min / ton of steel, so that the exposed area of ​​molten steel reaches 50%;

[0022] 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.

[0023] Step 3: Vacuumize for 3 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 argon blowing is 3NL / min / ton of steel. Argon time is less than or equal to 18min.

Embodiment 2

[0025] Under the initial conditions of controlling the thickness of tapping slag = 50mm, the temperature of molten steel arriving at the station at 1615°C, and the hydrogen content at the station at H = 0.0004%, the following steps are carried out:

[0026] Step 1: Deslagging the molten steel by blowing argon or nitrogen at the bottom, the flow rate of argon or nitrogen is 4NL / min / ton of steel, so that the exposed area of ​​molten steel reaches 40%;

[0027] 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.

[0028] Step 3: Vacuumize for 2 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 rate of argon blowing is 2NL / min / ton of steel. Argon time was 16 min.

Embodiment 3

[0030] Under the initial conditions of controlling the thickness of tapping slag = 50mm, the temperature of molten steel arriving at the station at 1615°C, and the hydrogen content at the station at H = 0.0007%, the following steps are carried out:

[0031] Step 1: Deslagging the molten steel by bottom blowing argon or nitrogen, the flow rate of argon or nitrogen is 7NL / min / ton of steel, so that the exposed area of ​​molten steel reaches 60%

[0032] 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.

[0033] Step 3: Vacuumize for 4 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 rate of argon blowing is 3.7NL / min / ton of steel, and the flow rate of argon gas remains unchanged until the end of molten steel treatment. The total ...

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Abstract

The invention relates to a method for smelting ultra-low hydrogen steel, which is an operation method for dehydrogenizing by using a single-nozzle refining furnace, in particular to a method for smelting ultra-low hydrogen steel by using the single-nozzle refining furnace. By using the method, ultra-low hydrogen steel with the hydrogen content no more than 1.5 ppm can be smelted. In the invention, initial conditions such as the thickness of a tapping slag layer, the temperature of arrival molten steel, the arrival hydrogen content and the like are controlled, and under a vacuum condition, theinsertion depth of a single-nozzle furnace dip pipe, the vacuum degree and the ladle eccentric bottom-blown argon stirring molten steel are adjusted to achieve the purpose of dehydrogenization. Therefore, the invention has the advantages of short time for processing molten steel, low consumption of refractory material, small nodule of the dip pipe, short smelting time, little splash, less sealingring consumption, no serious corrosion of a ladle, low cost and simple operation.

Description

technical field [0001] The invention relates to a method for smelting ultra-low hydrogen steel, which is a dehydrogenation operation method using a single nozzle refining furnace. Background technique [0002] At present, the methods for large-scale production of ultra-low hydrogen steel are mainly RH and VD smelting methods. [0003] ①RH (developed by Ruhrstahl and Heraeus by vacuum cycle 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 hydrogen steel. Due to the adoption of double-suction-nozzle dipping tubes in this method, the circulating flow rate is small and the molten steel flow rate is fast, which causes the problems of long processing time of molten steel, serious nodules in the vacuum chamber, and short service life of the dipping tube refractory mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/072C21C7/10C21C7/068
Inventor 赵元庆郭汉杰刘良田张鉴成国光杨学民
Owner 北京北科三泰科技发展有限公司
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