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A method for lowering the temperature of molten steel in the first heat of ladle in the tundish

A technology of molten steel temperature and tundish, applied in the field of continuous casting of iron and steel, can solve the problems of reducing the molten steel temperature of the first ladle in the tundish pouring, high equipment renovation cost, large tundish renovation, etc. Simple, low cost effect

Active Publication Date: 2020-03-31
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires a large transformation of the tundish, and the cost of equipment transformation is high; after the first furnace of ladle molten steel is poured into the tundish, heating the molten steel in the tundish will also consume a lot of energy, and will greatly increase the production cost
At present, during the pouring process of the tundish in the iron and steel enterprises, there is no effective and economical method to reduce the temperature of the molten steel in the first furnace of the tundish.

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  • A method for lowering the temperature of molten steel in the first heat of ladle in the tundish

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Embodiment 1

[0025] A method for reducing the temperature of molten steel in the first heat of the tundish pouring process, such as figure 1 As shown, the tundish used in this embodiment is 30 tons.

[0026] Step 1: Before the tundish starts pouring, when the first furnace of molten steel is poured into the tundish, blow inert gas into the molten steel in the tundish through the vent block at the bottom of the tundish. Among them: the pressure of blowing inert gas is: 0.2MPa, the flow rate is 1~5Nm 3 / h;

[0027] Step 2: Continuously blowing inert gas to increase the temperature of the molten steel within 6cm directly above the block of the vent nozzle of the tundish by 5-8°C. It is advisable to control the gas flow during the blowing process, so that the molten steel level fluctuates slightly.

[0028] Step 3: When the molten steel level in the tundish reaches the specified height, and the tundish starts to pour normally, stop blowing inert gas.

[0029] In the present embodiment, the...

Embodiment 2

[0032] A method for reducing the temperature of molten steel in the first heat of the tundish pouring process, such as figure 1 As shown, the tundish used in this embodiment is 40 tons.

[0033] Step 1: Before the tundish starts pouring, when the first furnace of molten steel is poured into the tundish, blow inert gas into the molten steel in the tundish through the vent block at the bottom of the tundish. Among them: the pressure of blowing inert gas is: 0.3MPa, the flow rate is 8 ~ 12Nm 3 / h;

[0034] Step 2: Continuously blowing inert gas to increase the temperature of the molten steel within 6cm directly above the block of the vent nozzle of the tundish by 5-8°C. It is advisable to control the gas flow during the blowing process, so that the molten steel level fluctuates slightly.

[0035] Step 3: When the molten steel level in the tundish reaches the specified height, and the tundish starts to pour normally, stop blowing inert gas.

[0036] In the present embodiment, ...

Embodiment 3

[0039] A method for reducing the temperature of molten steel in the first heat of the tundish pouring process, such as figure 1 As shown, the tundish used in this embodiment is 50 tons.

[0040] Step 1: Before the tundish starts pouring, when the first furnace of molten steel is poured into the tundish, blow inert gas into the molten steel in the tundish through the vent block at the bottom of the tundish. Among them: the pressure of blowing inert gas is: 0.4MPa, the flow rate is 15~20Nm 3 / h;

[0041] Step 2: Continuously blowing inert gas to increase the temperature of the molten steel within 6cm directly above the block of the vent nozzle of the tundish by 5-8°C. It is advisable to control the gas flow during the blowing process, so that the molten steel level fluctuates slightly.

[0042] Step 3: When the molten steel level in the tundish reaches the specified height, and the tundish starts to pour normally, stop blowing inert gas.

[0043] In the present embodiment, t...

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Abstract

A method for reducing the temperature of the first batch of molten steel in the tundish, belonging to the technical field of steel continuous casting; the method is: 1) before the tundish is opened, when the first batch of molten steel is poured into the tundish, The breathable nozzle seat brick at the bottom of the tundish blows inert gas into the molten steel in the tundish; 2) Continuously blow in inert gas to increase the temperature of the molten steel within 6cm directly above the breathable nozzle seat brick of the tundish by 5 to 8°C, and make the temperature of the molten steel uniform; During the blowing process, within the pressure and flow range specified in step 1, adjust the blowing pressure and flow rate according to the height of the liquid level in the tundish, so that the molten steel level fluctuates slightly; 3) The molten steel level in the tundish reaches the specified height , after normal pouring starts, stop blowing inert gas; the method of the present invention starts blowing in argon gas when the first batch of molten steel is poured into the tundish, effectively reducing the temperature of the first batch of molten steel in the tundish and reducing production cost, improve economic benefits, and are more suitable for on-site applications.

Description

technical field [0001] The invention belongs to the technical field of iron and steel continuous casting, and in particular relates to a method for reducing the temperature of molten steel in the first furnace of a tundish. Background technique [0002] When the tundish is not poured, the temperature inside the tundish is relatively low because the temperature of the lining of the tundish belongs to the "cold" tundish. When the tundish is poured, high-temperature molten steel enters the tundish, and the lining of the tundish will absorb part of the heat, causing the temperature of the molten steel in the tundish to drop more than the temperature of the molten steel in normal pouring. The lower temperature of the molten steel will make the fluidity of the molten steel worse , Steel condensation is prone to occur at the nozzle of the tundish, causing blockage of the nozzle or even a stop pouring accident. In order to prevent the nozzle of the tundish from being blocked by col...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/11
CPCB22D11/11
Inventor 郑淑国邹琦朱苗勇
Owner NORTHEASTERN UNIV LIAONING