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Method for reducing temperature of molten steel of casting furnace

A heat and molten steel technology, applied in the field of metallurgy, can solve problems such as unfavorable upgrading of old equipment, increased energy consumption due to corrosion of refractory materials, and breakout of mold shells, so as to avoid increased energy consumption and reduce casting defects. , the effect of improving quality

Pending Publication Date: 2022-02-25
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Raising the temperature of the molten steel can effectively avoid the cold steel at the nozzle of the tundish, but the temperature of the molten steel in the pouring furnace is too high, which will inevitably lead to intensified erosion of refractory materials and a large amount of energy consumption, which will increase production costs
At the same time, if the temperature of molten steel is too high, it will also cause slab defects such as slab bulging and center segregation, and may even cause steel breakout accidents due to the thin shell of the mold.
Compensating the temperature of the molten steel through the temperature compensation device can also effectively prevent the nozzle from being blocked by the sub-cooled steel in the casting furnace. However, the temperature compensation device has a large investment in equipment, high operating costs, and a large volume of equipment. For old equipment, there is still a space limitation. It is not conducive to upgrading and transformation, and cannot be widely used in the actual production of continuous casting

Method used

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  • Method for reducing temperature of molten steel of casting furnace
  • Method for reducing temperature of molten steel of casting furnace
  • Method for reducing temperature of molten steel of casting furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The type of steel used is HRB400, the theoretical solidification temperature of HRB400 is 1502°C, and the composition of the molten steel is shown in Table 1 below.

[0014] Table 1. Composition of HRB400 molten steel

[0015]

[0016] In the process of continuously pouring molten steel into the tundish during continuous casting, when the first furnace of molten steel reaches the pouring level of the tundish, the seamless calcium wire is drawn from the center of the nozzle center of the tundish within a diameter of 10cm to 11.4 Feed into the tundish at a speed of m / min. Under this feeding line speed, the molten steel level in the tundish fluctuates slightly, and the small bubbles in the feeding area blow away a circular range of about 20-25cm in diameter from the molten steel level. When the furnace molten steel is poured into the tundish to the middle stage, stop feeding the seamless calcium wire into the tundish. The feeding of the calcium wire can make the local t...

Embodiment 2

[0024] The type of steel used is 65#, and the theoretical solidification temperature of 65# is 1490°C. The composition of the molten steel is shown in Table 3 below.

[0025] Table 3. Composition of 65# molten steel

[0026]

[0027] In the process of continuously pouring molten steel into the tundish during continuous casting, when the first furnace of molten steel reaches the pouring level of the tundish, the seamless calcium wire is drawn from the center of the nozzle center of the tundish within 10cm in diameter by 8.8 Feed into the tundish at a speed of m / min. It is advisable that the molten steel level fluctuates slightly. When the second furnace molten steel is poured into the tundish to the middle stage, stop feeding the seamless calcium wire into the tundish and pass through the calcium wire. The feeding can make the local temperature of the molten steel directly above the tundish nozzle block rise, and the molten steel flow is more active, avoiding the blockage of...

Embodiment 3

[0035] The experimental steel type used is ER70S-6X, the theoretical solidification temperature of ER70S-6X is 1515°C, and the molten steel composition is shown in Table 5 below.

[0036] Table 5. ER70S-6X molten steel composition

[0037]

[0038] In the process of continuously pouring molten steel into the tundish during continuous casting, when the first furnace of molten steel reaches the pouring level of the tundish, the seamless calcium wire is drawn from the center of the nozzle center of the tundish within 10cm in diameter by 10.3 Feed into the tundish at a speed of m / min. It is advisable that the molten steel level fluctuates slightly. When the second furnace molten steel is poured into the tundish to the middle stage, stop feeding the seamless calcium wire into the tundish and pass through the calcium wire. The feeding can make the local temperature of the molten steel directly above the tundish nozzle block rise, and the molten steel flow is more active, avoiding...

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Abstract

The invention provides a method for reducing the temperature of molten steel in a casting furnace. According to the method, a seamless calcium line is fed into a tundish in the continuous casting process, and after calcium is gasified, many tiny bubbles can be formed in the molten steel above a tundish water gap and rapidly float upwards, so that a molten steel flow field above the tundish water gap becomes more active. Meanwhile, since the calcium element has high metallicity, the calcium element is quickly oxidized by oxygen in the molten steel and releases heat, the temperature of local molten steel can be increased, an active local high-temperature area can be formed right above the tundish through the operation, the phenomenon that a water gap of the tundish is blocked due to cold steel bonding during casting is avoided, low tundish temperature and low superheat degree pouring of a continuous casting casting furnace is realized, and the quality of a continuous casting billet is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a method for reducing the temperature of a tundish of a continuous casting furnace. Background technique [0002] The tundish plays a link role in the continuous casting process of molten steel. In order to avoid the situation that the molten steel solidifies due to the large amount of heat absorbed by the tundish during the casting process and cannot be used for continuous casting production, it must be baked before casting. , limited by the baking process conditions and equipment, the temperature of the tundish after baking can never reach the same level as the molten steel temperature. After the pouring molten steel enters the tundish, the lining of the tundish will still absorb a large amount of heat, so that the temperature of the molten steel close to the tundish wall is too low and the phenomenon of cold steel will appear. Because the inner wall structure at the nozzle o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/108B22D11/18
CPCB22D11/108B22D11/18
Inventor 胡明王立洲范伟翟有有张伟李晓燕陈开锋黄文胜
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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