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Method for synthetic slag washing of tundish

A tundish and synthetic slag technology, which is applied in the fields of tundish synthetic slag washing and molten steel purification, can solve the problems that inclusions cannot be effectively controlled, it is not conducive to the transformation of one machine and multi-stream continuous casting machine, and it affects the use effect, so as to achieve perfect metallurgy Functional, reduced clogging, enhanced efficiency and effectiveness

Inactive Publication Date: 2012-09-26
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the effect is good, the center of the magnetic field stirrer is just aligned with the steel flow of the ladle nozzle, so that the inclusions gathered in the center are partly washed into the molten steel by the steel flow, which affects its use effect
Moreover, the magnetic field stirrer adopts a rotating magnetic field generating device, and the structure is relatively complicated, which is not conducive to the transformation of the existing one-machine multi-strand continuous casting machine
[0004] Chinese Patent Publication No. 1301167C discloses a method for removing inclusions by generating fine air bubbles in molten steel in the tundish. When the air supply volume of this method is large, reaching 30-600l / min, the size of the air bubbles generated in the molten steel is mostly in the More than 1mm, the small-sized inclusions cannot be effectively controlled

Method used

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  • Method for synthetic slag washing of tundish
  • Method for synthetic slag washing of tundish

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The concrete steps of the method for tundish synthetic slag washing are:

[0026] 1. Make slag washing pipe 3: use Al-C refractory material to make a slag washing pipe 3 with a small upper opening and a large lower opening by hot isostatic pressing. The upper end of the slag washing pipe 3 cylindrical pipe body is provided with a circle The outer turning edge has an argon blowing hole on the turning edge.

[0027] At the same time, pre-melted slag is prepared. Its main components and weight percent content are:

[0028] CaO 40%, Al 2 o 3 30%, SiO 2 10%, MgO 3%, CaF 2 15%;

[0029] The melting point is 1450°C.

[0030] 2. Before the pouring of the large tank 1, place the edge of the prepared slag washing pipe 3 on the middle hole of the cover of the tundish 4, so that the lower part of the slag washing pipe 3 extends into the tundish 4, and the slag washing The pipe 3 is immersed in molten steel to a depth of 100 mm, and the distance between the lower end of t...

Embodiment 2

[0038] The concrete steps of the method for tundish synthetic slag washing are:

[0039] 1. Making slag washing pipe 3: using Mg-Cr refractory material, a slag washing pipe 3 with a small upper opening and a large lower opening is made by hot isostatic pressing. The outward turning edge has an argon blowing hole on the turning edge.

[0040] At the same time, pre-melted slag is prepared. Its main components and weight percent content are:

[0041] CaO 48%, Al 2 o 3 17%, SiO 2 5%, MgO 8%, CaF 2 18%;

[0042] The melting point is 1200°C.

[0043] 2. Before the pouring of the large tank 1, place the edge of the prepared slag washing pipe 3 on the middle hole of the cover of the tundish 4, so that the lower part of the slag washing pipe 3 extends into the tundish 4, and the slag washing The depth of immersion of the pipe 3 into the molten steel is 300 mm, and the distance between the lower end of the slag washing pipe 3 and the upper surface of the turbulence device at ...

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Abstract

The invention provides a method for the synthetic slag washing of a tundish. The method comprises the following steps of: manufacturing a slag washing tube with a small upper opening, a large lower opening and an upturned edge, wherein an argon blowing hole is reserved in the slag washing tube; before the pouring of a large tank, seating the slag washing tube on a tundish cover of the tundish, and inserting a long nozzle in the lower part of the large tank into the slag washing tube for pouring; and in the initial pouring stage, medium pouring stage and final pouring stage of the large tank, adding a certain amount of pre-molten slag into the slag washing tube respectively, and performing argon blowing, wherein the alkalinity of the pre-molten slag in the slag washing tube is controlled to be 2.5 to 3.2 in the pouring process. Tiny impurities with sizes of 5 to 100 mu m can be effectively removed from molten steel, the removal of tiny aluminum oxide impurities from the molten steel is facilitated, and the impurity removal efficiency and effects of the tundish are remarkably enhanced. The cleanliness of the molten steel is greatly improved, and the quality of steel is improved. In addition, the metallurgical functions of the tundish are completed, and the phenomenon that a submerged nozzle of the tundish is jammed is effectively reduced to ensure smooth production.

Description

technical field [0001] The invention belongs to the technical field of steelmaking technology, and in particular relates to a method for washing synthetic slag in a tundish and purifying molten steel. Background technique [0002] Tundish metallurgy is a special refining technology outside the furnace. With the continuous improvement of the requirements for the purity of molten steel, tundish metallurgy has become a key link in the steelmaking production process to ensure high-quality steel. People no longer use the tundish as a simple container, but through pure steel technology and oxide metallurgy technology, the size and quantity of non-metallic inclusions in molten steel are further controlled in the tundish, and micro-alloying elements are micro-regulated. In order to reduce inclusions, purify molten steel and improve steel quality, many tundish metallurgical techniques have been applied. Measures such as increasing the capacity and height of the tundish, installing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D1/00C21C7/072
Inventor 唐复平李镇姚伟智王晓峰张越林洋
Owner ANGANG STEEL CO LTD
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