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Compound deoxidant for solid steel

A technology of composite deoxidizer and killed steel, which is applied in the field of composite deoxidizer and can solve problems such as little effect

Inactive Publication Date: 2003-02-05
谢廷声
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] To control Al 2 o 3 A variety of measures have been taken, such as two-step deoxidation, wire feeding method, and protective pouring, but with little effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1 (weight %):

[0010] Select 60% active lime, 5% fluorite, and 35% aluminum powder for mixing, add 10% water glass after mixing, and then carry out further mixing, and then use a pelletizer to form pellets of Φ25mm.

[0011] Add the above-mentioned pellets to about 95 tons of KF11 molten steel with an amount of 5kg / T steel. After treatment, the molten steel contains oxygen [O]=62.8ppm, and before LF treatment, [%Als]=0.003%. The LF sampling is normal. During the LF process, aluminum particles are added to adjust [%Als] to the required target value. The casting state is good, and the inner diameter of the nozzle is slightly thickened.

Embodiment 2

[0012] Embodiment 2 (weight %):

[0013] Select 60% of active lime with a particle size of 3-5mm, 5% of fluorite, 30% of aluminum powder, and 5% of magnesium powder for mixing. Made into Φ25mm pellets.

[0014] Add the above-mentioned pellets to the low-aluminum molten steel with an amount of 5kg / T steel. After the treatment, the molten steel contains oxygen [O]=58.3ppm, and the rest of the treatment steps are the same as in Example 1. The surface quality of the continuous casting ring is improved, and no nodules are formed at the nozzle. .

[0015] The composite deoxidizer of the invention has excellent deoxidation ability similar to that of aluminum. Since the aluminum in it forms a low-melting composite oxide with other components immediately after deoxidation, and the composite oxide is easy to gather in molten steel, thereby quickly floating into the slag, thus preventing the deoxidation of aluminum due to the formation of Al 2 o 3 Gathered at the nozzle of the ladle...

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Abstract

The composite deoxidant for killed steel contains (wt%) 40-70% of active lime and 30-60% of aluminium, also contains 5-15% of one or several substances selected from fluorite, silica and salt and one or several deoxidizing substances selected from silicon, manganese, barium, magnesium, calcium or its alloy. The described composite deoxidant is a kind of pellet whose diameter is 20-30 mm. Said composite oxide is easy to aggregate in the molten steel, and can be quickly floated upwards into slag, so that it can prevent Al2O3 produced by using aluminium to make deoxidation from being aggregated at steel ladle gate and can eliminate pouring fault of blocking gate.

Description

technical field [0001] The invention relates to a composite deoxidizer for killed steel. Background technique [0002] Deoxidizing molten steel with metallic aluminum will generate Al 2 o 3 , This deoxidized product gathers at the nozzle of the ladle, thereby blocking the nozzle and causing pouring accidents. The top-blown converter steelmaking process commonly used at present usually blows the end point carbon very low, so that the oxygen content in molten steel rises sharply, so a large amount of strong deoxidizer is needed to deoxidize molten steel. The most commonly used strong deoxidizer is aluminum, and the process requirements can only be met when the amount of aluminum added is 2.5-5kg / T steel. Since the amount of aluminum added to the ladle is large, and aluminum is generally added to the bottom of the ladle, the deoxidized product Al 2 o 3 A lot gathers at the bottom of the bag. During pouring, these Al 2 o 3 It condenses at the nozzle of the ladle, and as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06
Inventor 谢廷声
Owner 谢廷声
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