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Method for lowering consumption of tundish covering agent

A covering agent and tundish technology, applied in the field of metallurgy, can solve the problems of large consumption of covering agent, high manufacturing cost, crusting, etc., and achieve the effect of avoiding the problem of slag inclusion in billets, preventing crusting, and reducing manufacturing costs

Inactive Publication Date: 2018-02-13
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the disadvantages of the above-mentioned prior art that the alkaline tundish covering agent is easy to form a shell around the stopper rod in the later stage of casting during the continuous casting process, and the consumption of the covering agent is large and the manufacturing cost is high. Provides a method of reducing tundish covering agent consumption

Method used

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  • Method for lowering consumption of tundish covering agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: Inject molten steel into the tundish. After the liquid level of the molten steel is greater than 400 mm, add the lower covering agent to the tundish for the first time, and the addition amount is 250 kg; Add the lower covering agent in an amount of 100kg, so that the lower covering agent is evenly dispersed on the molten steel surface; add carbonized rice husks on the surface of the lower covering agent, the addition amount is 120kg, and the carbonized rice husks are evenly dispersed on the surface of the lower covering agent. The amount of carbonized rice husk added is 25% of the total covering agent. Comparing the control elements in the refined outbound molten steel and the molten steel after continuous casting, as shown in Table 2, the control amounts of carbon and silicon meet the standards of H08A steel, and the amount of carbon added is less than 0.01%. Crusts appeared around the rod. The lower covering agent effectively prevents the carbonized ric...

Embodiment 2

[0040]Embodiment 2: Inject molten steel into the tundish. After the liquid level of the molten steel is greater than 400mm, add the lower covering agent to the tundish for the first time, and the addition amount is 270kg; Add the lower covering agent in an amount of 120kg, so that the lower covering agent is evenly dispersed on the molten steel surface; add carbonized rice husks on the surface of the lower covering agent, the addition amount is 170kg, and the carbonized rice husk is evenly dispersed on the surface of the lower covering agent. The amount of carbonized rice husk added is 30% of the total covering agent. Comparing the control elements in the refined outbound molten steel and the continuous casting molten steel, as shown in Table 3, the control amounts of carbon and silicon are in line with the standard of H08A steel, and the amount of carbon added is less than 0.01%. There is no encrustation phenomenon around. The lower covering agent effectively prevents the ca...

Embodiment 3

[0043] Embodiment 3: Inject molten steel into the tundish. After the liquid level of the molten steel is greater than 400 mm, add the lower covering agent to the tundish for the first time, and the addition amount is 290 kg; Add the lower covering agent in an amount of 140kg, so that the lower covering agent is evenly dispersed on the molten steel surface; add carbonized rice husks on the surface of the lower covering agent, the addition amount is 190kg, and the carbonized rice husks are evenly dispersed on the surface of the lower covering agent. The amount of carbonized rice husk added is 30% of the total covering agent. Comparing the control elements in the refined outbound molten steel and the molten steel after continuous casting, as shown in Table 4, the controlled amounts of carbon and silicon meet the standards of H08A steel, and the amount of carbon added is less than 0.01%. There is no encrustation phenomenon around. The lower covering agent effectively prevents the...

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Abstract

The invention relates to a method for lowering the consumption of a tundish covering agent and belongs to the technical field of metallurgy. The method comprises the steps that 1), molten steel is injected into tundish; 2), a lower covering agent is added to the tundish to keep the temperature of the molten steel so as to prevent secondary oxidation of the molten steel; and 3), an upper covering agent is added to the tundish to keep the temperature of the lower covering agent so as to prevent the surface of the lower covering agent from crusting. In the low-carbon low-silicon steel productionprocess, the upper covering agent such as low-cost carbonized rice hulls covers the high-cost lower cover agent, the surface of the lower covering agent can be prevented from generating crusting phenomenon, the casting blank slag inclusion problem caused by crusting of the lower covering agent is avoided, the consumption of the high-cost lower covering agent is lowered, and the manufacturing costis lowered.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for reducing the consumption of a tundish covering agent. Background technique [0002] In the continuous casting process, in order to reduce the temperature drop of the molten steel in the tundish and prevent secondary oxidation of the molten steel, it is necessary to add a covering agent in the tundish to protect the molten steel in the tundish. The tundish covering agent can play the role of heat insulation and heat preservation to prevent heat dissipation, and can isolate the air, prevent oxygen in the air from entering the molten steel, and prevent secondary oxidation of the molten steel. In particular, the alkaline tundish covering agent can absorb the non-metallic inclusions floating to the molten steel surface to purify the molten steel, and the covering agent does not react with the molten steel to avoid polluting the molten steel. However, during the castin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 李亚厚康毅梁新维胡心光贾元海靳刚强
Owner HEBEI IRON AND STEEL
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