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Method for adding magnesium metal in refining process of vacuum circulating degassing furnace

A vacuum cycle degassing and refining process technology, applied in the field of steelmaking technology, can solve the problems of no metallurgical workers, difficulty in adding molten steel, high steam pressure, etc., achieve the effect of small size, increase the number of continuous casting furnaces, and promote melting

Inactive Publication Date: 2012-12-26
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high vapor pressure of magnesium at metallurgical temperatures, it is difficult to add to molten steel, so it has not attracted enough attention from metallurgists for a long time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Preparation of bulk flux:

[0021] Process CaO into CaO powder with a particle size of 0.5mm and an activity greater than 350ml, grind high-basic pre-slag into a high-basic pre-slag powder with a particle size of 160 μm and an optical basicity of 6, and grind carbonate into Carbonate powder with a particle size of 60μm, metal magnesium is processed into metal magnesium powder with a particle size of 0.3mm. After the prepared CaO powder 40wt%, high alkalinity pre-slag powder 40wt%, carbonate powder 10wt%, metal magnesium powder 10wt% are mixed evenly, adopt dry-type briquetting machine to press into a spherical flux with a diameter of 20mm, And ensure that the compressive strength of each sphere flux reaches 22N, and the drop strength of one meter reaches 6 times.

[0022] 2. Adjust the position of the downcomer of the RH furnace so that it is on the side of the downcomer.

[0023] 3. After the ladle arrives at the RH station, measure the temperature and take sample...

Embodiment 2

[0025] 1. Preparation of bulk flux:

[0026] Process CaO into CaO powder with a particle size of 0.9mm and an activity greater than 350ml, grind high-basic pre-slag into a high-basic pre-slag powder with a particle size of 50 μm and an optical basicity of 8, and grind carbonate into Carbonate powder with a particle size of 180μm, metal magnesium is processed into a metal magnesium powder with a particle size of 1mm. After mixing 50wt% of prepared CaO powder, 30wt% of high-basicity pre-slag powder, 5wt% of carbonate powder and 15wt% of metal magnesium powder, adopt dry-type briquetting machine to press into a spherical flux with a diameter of 30mm, And ensure that the compressive strength of each sphere flux reaches 24N, and the drop strength of one meter reaches 7 times.

[0027] 2. Adjust the position of the downcomer of the RH furnace so that it is on the side of the downcomer.

[0028] 3. After the ladle arrives at the RH station, measure the temperature and take samples,...

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Abstract

The invention provides a method for adding magnesium metal in a refining process of a vacuum circulating degassing furnace. The method comprises the following steps: after RH (ruhrstahl-heraeus) refining alloying, when the vacuum degree of a vacuum chamber of an RH furnace is smaller than 200Pa, and alpha[O] is smaller than or equal to 0.0003%, adding a lump fusing agent prepared from CaO powder, high-alkalinity premelted slag powder, carbonate powder and metal magnesium powder in a mixing manner by batch; controlling each batch of adding quantity at 0.2-0.6kg / ton and the interval time at 1-3 minutes, and clearly circulating for 0-5 minutes after the lump fusing agent is added; and the lump fusing agent comprises the following components by weight: 30-50% of CaO powder, 30-50% of high-alkalinity premelted slag powder, 1-10% of carbonate powder and 5-20% of metal magnesium powder. According to the method for adding the magnesium metal in the refining process of the vacuum circulating degassing furnace, the yield of the magnesium metal is high and stable; the mean yield can be up to 43.75%; and meanwhile, the quality of foreign substances in molten steel is greatly reduced; the quantity of continuous casting furnaces is increased; the magnesium content in the molten steel is improved, and the purpose of improving the quality of the molten steel is achieved.

Description

technical field [0001] The invention belongs to the technical field of steelmaking technology, and in particular relates to a method for adding metal magnesium in the process of vacuum circulation degassing refining (that is, RH refining). Background technique [0002] It is well known that the quantity, volume, shape and distribution of non-metallic inclusions in steel will have adverse effects on the mechanical properties of steel. Non-metallic inclusions endanger the quality of steel, which directly determines the final application of steel. In some cases, the ultimate solution to these problems may well depend on ultra-pure steel production methods. Ultra-pure steel contains very small, very small and irregularly distributed inclusions, which do not affect the properties of the steel. [0003] As a common deoxidizer in steelmaking, aluminum has been recognized for its deoxidation ability and grain refinement. However, aluminum deoxidation produces a large amount of fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/06
Inventor 唐复平李镇王晓峰费鹏毛志勇张越辛国强林洋
Owner ANGANG STEEL CO LTD
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