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A tundish auxiliary slag removal agent and its application method

A technology of tundish and slagging agent, which is applied in the field of iron and steel smelting, can solve the problems of lower crystallizer control precision, achieve the effects of improving purity and surface quality, high fluidity, and improving flow control precision

Active Publication Date: 2017-12-26
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present invention provides a tundish auxiliary slagging agent and its use method to solve the technical problem in the prior art that the control accuracy of the crystallizer is likely to be reduced due to the use of a high-alkalinity tundish covering agent

Method used

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  • A tundish auxiliary slag removal agent and its application method
  • A tundish auxiliary slag removal agent and its application method
  • A tundish auxiliary slag removal agent and its application method

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Experimental program
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Effect test

Embodiment 1

[0039] After the refining, the temperature of the first furnace was set to 1608°C, and the sedation time of the first furnace was set to 37min; the temperatures of the continuous pouring furnaces were 1591 °C, 1599 °C, 1595 °C, 1599 °C, 1591 °C, 1599 °C, and the continuous pouring furnaces were The sedation time is 30min, 35min, 29min, 28min, 25min, 24min in sequence; the superheat degree of the tundish is set to 27~37℃; the pouring section is 1500mm, and the pulling speed is 1.3m / min; After the start of pouring, after the liquid level of the tundish rises to the normal liquid level, put 10kg of auxiliary slagging agent near the stopper rod.

[0040] Please refer to figure 2 , figure 2 The schematic diagram of the liquid level fluctuation of the continuous pouring furnace provided for the first embodiment, such as figure 2 As shown, the qualified rate of the liquid level fluctuation of this continuous pouring furnace is above 95%.

Embodiment 2

[0042] After refining, the temperature of the first furnace was set to 1603°C, and the sedation time of the first furnace was set to 29min; the temperatures of the continuous pouring furnaces were 1598 °C, 1592 °C, 1593 °C, 1592 °C, 1591 °C, 1590 °C, and the continuous pouring furnaces were in turn. The sedation time is 24min, 29min, 22min, 23min, 24min, 24min in sequence; the superheat degree of the tundish is set to 27~37℃; the pouring section is 1500mm, and the pulling speed is 1.3m / min; After the start of pouring, after the liquid level of the tundish rises to the normal liquid level, put 10kg of auxiliary slagging agent near the stopper rod.

[0043] Please refer to image 3 , image 3 The schematic diagram of the liquid level fluctuation of the continuous pouring furnace times provided for the second embodiment, such as figure 2 As shown, the qualified rate of the liquid level fluctuation of this continuous pouring furnace is above 95%.

Embodiment 3

[0045] After the refining, the temperature of the first furnace was set to 1608°C, and the sedation time of the first furnace was set to 37min; the temperatures of the continuous pouring furnaces were 1591 °C, 1599 °C, 1595 °C, 1599 °C, 1591 °C, 1599 °C, and the continuous pouring furnaces were The sedation time is 30min, 35min, 29min, 28min, 25min, 24min in sequence; the superheat degree of the tundish is set to 27~37℃; the pouring section is 1500mm, and the pulling speed is 1.3m / min; After the start of pouring, after the liquid level of the tundish rises to the normal liquid level, put 10kg of auxiliary slagging agent near the stopper rod.

[0046] Please refer to Figure 4 , Figure 4 The schematic diagram of the liquid level fluctuation of the continuous pouring furnace times provided for the second embodiment, such as Figure 4 As shown, the qualified rate of the liquid level fluctuation of this continuous pouring furnace is above 95%.

[0047] pass figure 2 , imag...

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Abstract

The invention discloses an auxiliary slag melting agent for a tundish and an application method thereof. The application method is characterized in that the temperature of a first furnace is 1600 to 1610 DEG C after the refining is finished, and the first furnace is killed for not less than 25min; the temperature of continuous casting furnaces is 1590 to 1600 DEG C, and the continuous casting furnaces are killed for not less than 20min; after a steel ladle is started to be casted and before a lower edge of a long sprue is covered with the liquid in the tundish, 150-200kg tundish covering agents are introduced from the lower part of the long sprue of a big tundish, two sides of a stopper rod are roasted and then 50-100kg tundish covering agents are idly introduced to the two sides of the stopper rod, and 300-500kg tundish covering agents are introduced once after the long sprue is full of the liquid; the degree of superheat of the tundish is no lower than 25 and no greater than 40 DEG C; since the casting of a third furnace, 10-30kg auxiliary slag melting agents for tundish are introduced near the stopper bar when the liquid in the tundish is filled to reach the normal level. With the adoption of the application method, the technical problem that a high-alkalinity tundish covering agent is used in the prior art and easily leads to the reduction of control precision of a crystallizer can be solved, and thus the purity and the surface quality of steel and iron products can be improved.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, in particular to a tundish auxiliary slag removing agent and a method for using the same. Background technique [0002] Continuous casting is the abbreviation of Continuous Steel Casting (English, Continuous Steel Casting). Smelting field has been widely used. [0003] At present, with the increasingly high quality requirements for steel products, for example, for the interstitial-free steel (English: Interstitial-Free Steel; IF) required by the automobile and other industries, the surface quality of the interstitial-free steel is The requirements are getting higher and higher, and for the manufacturer, it is not only necessary to provide the quality of metal products, but also to ensure that the price of the products will not increase too much. [0004] Therefore, at present, manufacturers of iron and steel products mostly use the method of controlling the fluctuation of the liquid level...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 景财良张丙龙王胜东梅宁刘延强单庆林彭国仲李金柱曹盛
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD