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Method for reducing aluminum-containing steel inclusions

A technology of inclusions and aluminum steel, applied in the field of iron and steel metallurgy, can solve problems affecting steel strength, toughness, processing performance, aluminum-containing steel cannot meet quality requirements, reduce steel mechanical properties and fatigue resistance, etc., to improve mechanical properties and anti-fatigue properties, reduction of cold-rolled inclusions, and improvement of strength

Inactive Publication Date: 2019-11-15
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the content of inclusions in aluminum-containing steel is high, which seriously affects the strength, toughness, and processing performance of steel, reduces the mechanical properties and fatigue resistance of steel, and makes aluminum-containing steel unable to meet quality requirements.

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0025] Taking the production of CSC steel as an example, the present invention will be further illustrated.

[0026] 1. During converter smelting, the carbon content of tapping is required to be 0.035%, and the temperature of molten steel after tapping is 1690℃;

[0027] 2. During the tapping process, add 2.0kg / t of small lime particles for steelmaking when the tapping volume is 1 / 4 to 1 / 2;

[0028] 3. At the end of tapping, use the bottom of the ladle to blow argon with the flow rate controlled at 500Nm 3 / h, the blowing time is 1 minute, so that the small lime particles are evenly spread on the molten steel surface in the ladle.

[0029] 4. After the lime particles are spread out, add 1.2kg / t of environmentally friendly slag modifier to the ladle. The environmentally friendly slag modifier can be evenly spread on the slag surface of the ladle, and the flow of argon blowing at the bottom of the ladle is controlled at 80Nm 3 / h, the blowing time is 1 minute.

[0030] 5. After entering ...

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Abstract

The invention relates to the technical field of ferrous metallurgy, in particular to a method for reducing aluminum-containing steel inclusions. The process route of converter smelting, steel ladle top slag modification behind a converter, top slag modification of a vacuum degassing furnace and casting of a continuous casting machine is adopted. In the tapping process, lime granules for steelmaking are added, after the lime granules are spread, a slag modification agent is added into a steel ladle, and after treatment of the vacuum degassing furnace is finished, the slag modification agent isadded into the steel ladle. The slag modification agent of the steel ladle is used for removing slag oxidization molten steel inclusions, through top slag deoxidization behind the converter and in thesteel ladle of the vacuum degassing furnace, the FeO content of slag in the steel ladle is reduced to 12% from original 20% when the slag just enters the vacuum degassing furnace, the FeO content ofthe slag is reduced to 8% from original 15% when the slag moves out of the vacuum degassing furnace, and the cold rolling inclusion rate is reduced by 50%. The strength, toughness and machining performance of steel are improved, the mechanical performance and anti-fatigue performance of the steel are improved, and then the quality of aluminum-containing steel is improved.

Description

Technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for reducing aluminum-containing steel inclusions. Background technique [0002] The performance of steel mainly depends on the chemical composition and structure of the steel. At present, users have increasingly higher requirements for the strength, toughness, and processing properties of steel, and the requirements for the chemical composition and uniformity of the steel are also getting higher and higher. Steel inclusions mainly exist in the form of non-metallic compounds, such as oxides, sulfides, nitrides, etc., which cause uneven steel structure, and their geometric shape, chemical composition, physical factors, etc. not only make the cold and hot workability of steel And certain physical and chemical indicators deteriorate, and it can also reduce the mechanical properties and fatigue properties of steel. [0003] In the production of household applian...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C7/06C21C7/072C21C7/076C21C7/10
CPCC21C5/28C21C7/0006C21C7/06C21C7/072C21C7/076C21C7/10Y02P10/20
Inventor 潘统领谭振军朱国强齐志宇毛志勇杜林
Owner ANGANG STEEL CO LTD
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