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Method for accurately controlling residue alkalinity of tundish in continuous-casting steel pouring process

A precise control, tundish technology, applied in the field of steelmaking, can solve the problem of reducing the ability to absorb inclusions, affecting the composition and quality of molten steel, and reducing the number of inclusions

Active Publication Date: 2010-09-29
ANGANG STEEL CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The control of tundish alkalinity is an important symbol to control the index of tundish slag. In the process of continuous casting and pouring steel, the alkalinity of tundish slag will gradually decrease with the increase of pouring time, which will reduce the ability to absorb inclusions in the later stage of pouring, thus Affect the composition and quality of molten steel

Method used

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  • Method for accurately controlling residue alkalinity of tundish in continuous-casting steel pouring process

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Embodiment Construction

[0012] The technical solution is to add a certain amount of small-grained white ash to the tundish steel surface at the same time as the covering agent is put into the molten steel pouring process in the continuous casting process, so as to achieve the purpose of accurately controlling the alkalinity of the tundish slag.

[0013] Take the process of producing ultra-low carbon steel in a 180-ton steel ladle and a 50-ton tundish as an example:

[0014] Small-grain white ash technical conditions:

[0015] project

skills requirement

SiO 2 ,%

≤2.0

CaO, %

≥85.0

Granularity, mm

8～20

[0016] Covering agent technical conditions:

[0017]

[0018] 1) By sampling and analyzing the tundish slag, the changes of ultra-low carbon steel tundish slag are obtained as follows:

[0019] Can times

Alkalinity

Adding amount of covering agent, t

first can

2.43

600

second can

2.35

200

...

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PUM

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Abstract

The invention relates to the technical field of the steelmaking, which is a method for accurately controlling the residue alkalinity of the tundish in continuous-casting steel pouring process. The method comprises the steps that: in molten steel pouring process of the continuous casting procedure, when a covering agent is thrown into the molten steel surface of the tundish, every pot is matched to be added with granule lime with the granularity of 8-20mm to conduct the adjustment of the residue alkalinity. The method considers the influence of steel grade, pouring positions, and the performance and the added amount of the covering agent on the residue alkalinity, and controls the residue alkalinity of the tundish by adjusting the added amount of the covering agent and the granule lime. Compared with the prior art, the method has the benefits of being capable of accurately controlling the residue alkalinity of the tundish in the continuous-casting steel pouring process and reducing the quantity content of the inclusion by more than 20%.

Description

technical field [0001] The invention relates to the technical field of steelmaking, and relates to a method for improving the alkalinity of tundish slag in the steel pouring process of the continuous casting process. Background technique [0002] In steelmaking production, tundish metallurgy is a very important link, which plays a very critical role in removing inclusions and foreign matter in molten steel during continuous casting. The top slag of the tundish can keep warm and absorb inclusions and foreign matter in the steel, especially Al 2 o 3 Inclusion and other important functions. The control of tundish alkalinity is an important indicator of controlling tundish slag index. In the process of continuous casting and pouring steel, the tundish slag basicity will gradually decrease with the increase of pouring time, which will reduce the ability to absorb inclusions in the later stage of pouring, thus Affect the composition and quality of molten steel. Contents of th...

Claims

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Application Information

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IPC IPC(8): B22D11/108
Inventor 孙群李伟东王荣吴春杰
Owner ANGANG STEEL CO LTD
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