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Method for deoxidation in ladle furnace (LF) refining furnace by using low calcium ferro-manganese-aluminium

A low-calcium-aluminum-ferromanganese and refining furnace technology is applied in the field of steelmaking to achieve the effect of improving the quality of steel and reducing the quantity

Inactive Publication Date: 2012-10-10
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the deoxidizer used in the prior art is Almanganese Ferro

Method used

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  • Method for deoxidation in ladle furnace (LF) refining furnace by using low calcium ferro-manganese-aluminium
  • Method for deoxidation in ladle furnace (LF) refining furnace by using low calcium ferro-manganese-aluminium
  • Method for deoxidation in ladle furnace (LF) refining furnace by using low calcium ferro-manganese-aluminium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (a) In the LF refining furnace, low-calcium aluminum manganese ferromanganese is used to carry out deoxidation alloying, and the amount of molten steel is 93.3 tons, and the addition is 50kg;

[0020] (b) Take a slab sulfur stamp sample to test the total oxygen content and aluminum addition in the steel;

[0021] (c) Take the billet for sulfur stamp inspection.

[0022] The test method of embodiment 2~embodiment 3 is the same as embodiment 1, and its specific data are shown in table 3.

[0023] Table 3 is the sampling analysis result of Examples 1-3 by the method of the present invention.

[0024] Table 3 Total oxygen content and aluminum increase in steel after adding low calcium Almanganese ferromanganese deoxidation in LF furnace

[0025]

[0026]

[0027] Table 4 is the sampling and analysis results of Examples 4-6 by adding Almanganese ferroalloy to LF furnace and using the method of the present invention.

[0028] Table 4 The total oxygen content and the ...

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Abstract

The invention relates to a method for deoxidation in a ladle furnace (LF) refining furnace by using low calcium ferro-manganese-aluminium. The method is characterized in that: the low calcium ferro-manganese-aluminium is used for deoxidation alloying in the LF refining furnace, wherein 50 kg of low calcium ferro-manganese-aluminium is added into 90 to 100 tons of molten steel; the low calcium ferro-manganese-aluminium comprises the following components in weight by percentage: 0.1 to 0.8 of C, 0.5 to 1.0 of Si, 5 to 7.5 of Mn, less than or equal to 0.05 of P, 40 to 44.5 of Al, 3 to 5 of Ca, and the balance of Fe. The method has the advantage that the low calcium ferro-manganese-aluminium is added in the LF refining furnace for deoxidation alloying. In term of the process control, when the low calcium ferro-manganese-aluminium is used for deoxidation, the total oxygen content is very low, and the fluctuation range (weight content) is 9 to 10 ppm and is 9.3 ppm in average; therefore, the amount of oxide inclusions in the steel can be effectively reduced, and the quality of the steel is improved.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and relates to a method for deoxidizing with low calcium aluminum manganese ferromanganese in an LF refining furnace. Background technique [0002] Non-metallic inclusions in steel reduce the plasticity, toughness and fatigue life of steel, deteriorate the processing performance of steel, and have a direct impact on the surface finish and welding performance of steel. Oxide inclusions in steel are mainly deoxidized products trapped in steel and dissolved oxygen in steel precipitate solid oxides during solidification. An effective means to reduce oxide inclusions in steel is the control of total oxygen in steel, including the reduction of free oxygen, the removal of inclusion content in molten steel and the secondary oxidation control of molten steel. Mainly through the control of the end point of the converter, the selection of the type of deoxidized alloy, the time and sequence of adding, t...

Claims

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Application Information

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IPC IPC(8): C21C7/06
Inventor 陈建新云霞张怀军方伟
Owner INNER MONGOLIA BAOTOU STEEL UNION
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