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Compound deoxidizer

A technology of compound deoxidizer and treatment agent, applied in the field of converter steelmaking, can solve the problems of reducing the strength and toughness of steel, uneven steel structure, destroying the continuity of the steel matrix, etc., and achieve the effect of improving quality and purifying molten steel

Active Publication Date: 2018-07-20
SHANDONG IRON & STEEL CO LTD
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AI Technical Summary

Problems solved by technology

The existence of non-metallic inclusions destroys the continuity of the steel matrix, resulting in uneven steel structure, which will have a certain impact on various properties of the steel, such as reducing the strength and toughness of the steel, etc.

Method used

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Examples

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Embodiment Construction

[0018] The following are examples of the present invention, which are only used to explain the present invention and not to limit.

[0019] The following examples provide a new composite deoxidizer, including carbonates, basic oxides, expanded graphite and magnesium treatment agent, the carbonate is calcium carbonate, and the basic oxides are calcium oxide, The magnesium treatment agent is passivated magnesium particles; the mass ratio of the carbonate, basic oxide, expanded graphite and magnesium treatment agent is 20-30:20-30:35-45:4-8. The composite deoxidizer may also contain other impurities that do not affect smelting, for example, other impurities in the composite deoxidizer are 7%.

[0020] Carbonate can also use magnesium carbonate, and the corresponding basic oxide can also be magnesium oxide, magnesium carbonate, calcium hydrochloride, but for the use of magnesium-containing raw materials, it can achieve the same effect as the corresponding calcium-containing raw ma...

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PUM

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Abstract

The invention provides a novel deoxidizer for converter and refining furnace steelmaking. The compound deoxidizer comprises carbonate, alkaline oxide, expanded graphite and a magnesium treating agent.Passivated magnesium powder serves as the magnesium treating agent. A great number of small slag drips can be formed in the smelting process of a converter tapping position and an LF refining furnaceposition through the compound deoxidizer and rapidly react with oxide produced after deoxidization to form a compound, and the slag washing process is completed. Meanwhile, the carbonate and the expanded graphite are heated to release bubbles, inclusions can adhere to the bubbles to float upwards, and then the effects of purifying molten steel and improving the quality are achieved.

Description

technical field [0001] The invention relates to the field of converter steelmaking, in particular to molten steel deoxidation and inclusion removal. Background technique [0002] Non-metallic inclusions in steel are mainly compounds formed by iron, manganese, chromium, aluminum, titanium and other metal elements and oxygen, sulfur, nitrogen, etc. Among them, the oxides are mainly deoxidation products, including primary deoxidation products that fail to float and deoxidation products formed by deoxidation reaction (secondary oxidation) during the solidification process of molten steel; or due to slag and refractory materials mixed into steel. . The existence of non-metallic inclusions destroys the continuity of the steel matrix, resulting in uneven steel structure, which will have a certain impact on various properties of the steel, such as reducing the strength and toughness of the steel. Non-metallic inclusions are mainly sulfides (MnS, FeS, etc.), oxides (FeO, MnO, CaO, ...

Claims

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Application Information

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IPC IPC(8): C21C7/06
CPCC21C7/06
Inventor 张佩肖强付春崔洪权倪培亮
Owner SHANDONG IRON & STEEL CO LTD
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