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A method for smelting high-aluminum sulfur-containing calcium-controlling steel

A process method, the technology of sulfur-controlled calcium steel, applied in the field of metallurgy, can solve the problems of reducing the alkalinity of slag, violent reaction, clogging of continuous casting nozzle, etc., and achieve the effect of improving production efficiency, improving economic benefits and improving mechanical properties

Active Publication Date: 2021-07-09
石钢京诚装备技术有限公司
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AI Technical Summary

Problems solved by technology

[0003] This kind of steel contains sulfur, calcium, and aluminum components at the same time, and the component content is S: 0.015-0.040%, Ca: 0.0015-0.0030%, Al: 0.01-0.04%. The difficulty lies in the formation of aluminum oxide and high calcium sulfide during smelting. Melting point inclusions cause blockage of continuous casting nozzle
When high-alumina sulfur-containing calcium-controlled steel is smelted in a converter, the post-furnace deoxidation adopts the method of adding steel core aluminum and aluminum wire, which is easy to form Al2O3 inclusions, and then feeds calcium wire after refining and breaking the void to form calcium sulfide inclusions, Al2O3 1. Calcium sulfide inclusions are one of the main sources of nodulation in the continuous casting nozzle. The number of continuous casting furnaces is only 2 furnaces, and the number of continuous casting furnaces is small. Not only continuous casting broken pouring accidents occur, but also smelting costs are increased
[0004] At present, the production of high-aluminum sulfur-containing calcium-controlling steel generally adopts high-sulfur control before VD, and no sulfur replenishment line after VD. The main problems of this type of process are: (1) When vacuuming, the slag reacts violently with molten steel, and after breaking the vacuum The absorption rate of sulfur is unstable and the loss of sulfur is large
(2) It is easy to form calcium sulfide inclusions, which affects the production rhythm
[0005] Many special steel plants use to reduce the basicity of refining slag, and the binary basicity is controlled at about 3.5. The problem lies in: (1) The refining process reduces the basicity of slag, resulting in too thin slag and unstable submerged arc
(2) The decrease of slag basicity will increase the oxygen content of molten steel, aggravate the formation of aluminum oxide, affect the product quality, and do not improve the essence of nodulation

Method used

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  • A method for smelting high-aluminum sulfur-containing calcium-controlling steel
  • A method for smelting high-aluminum sulfur-containing calcium-controlling steel
  • A method for smelting high-aluminum sulfur-containing calcium-controlling steel

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Embodiment 1

[0027] The smelting process of the high-aluminum sulfur-containing calcium-controlling steel in this embodiment includes converter smelting, LF refining, VD vacuum treatment, and continuous casting. The specific process steps are as follows:

[0028] (1) Converter smelting process: 2.0㎏ / t steel core aluminum is added during the tapping process of the converter, and then the alloy is added, and the pre-melted refining slag is added at 4.31㎏ / t steel and lime 5.22kg / t steel, and sulfur is added at the end of tapping Iron 0.93kg / t steel, sulfur content controlled at 0.046%;

[0029] (2) LF refining process: molten steel reaches the refining position at a temperature of 1522°C, uses silicon carbide 4.0kg / t steel for diffusion deoxidation, does not use aluminum particles, and keeps white slag for 22 minutes; during the refining process, heat up to 1595°C and add sulfur powder 0.35kg / t t steel; the sulfur element in the refining slag is saturated, and the composition of the refining ...

Embodiment 2

[0036] The smelting process of the high-aluminum sulfur-containing calcium-controlling steel in this embodiment includes converter smelting, LF refining, VD vacuum treatment, and continuous casting. The specific process steps are as follows:

[0037] (1) Converter smelting process: 2.1㎏ / t steel core aluminum is added during the tapping process of the converter, and then the alloy is added, the pre-melted refining slag is added at 4.32㎏ / t steel, the lime is 5.37kg / t steel, and sulfur is added at the end of tapping Iron 0.83kg / t steel, sulfur content controlled at 0.044%;

[0038] (2) LF refining process: molten steel reaches the refining position temperature of 1517°C, uses silicon carbide 4.5kg / t steel for diffusion deoxidation, does not use aluminum particles, and keeps white slag for 27 minutes; during refining process, heat up to 1596°C and add sulfur powder 0.39kg / t t steel; the sulfur element in the refining slag is saturated, and the composition of the refining slag is: ...

Embodiment 3

[0044] The smelting process of the high-aluminum sulfur-containing calcium-controlling steel in this embodiment includes converter smelting, LF refining, VD vacuum treatment, and continuous casting. The specific process steps are as follows:

[0045] (1) Converter smelting process: 1.9㎏ / t steel core aluminum is added during the tapping process of the converter, and then the alloy is added, pre-melted refining slag is added at 4.28㎏ / t steel, lime 5.19kg / t steel is added, and sulfur is added at the end of tapping Iron 0.85kg / t steel, sulfur content controlled at 0.044%;

[0046] (2) LF refining process: molten steel reaches the refining position at a temperature of 1534°C, uses silicon carbide 4.7kg / t steel for diffusion deoxidation, does not use aluminum particles, and keeps the white slag for 25 minutes; during the refining process, heat up to 1588°C and add sulfur powder 0.42kg / t t steel; the sulfur element in the refining slag is saturated, and the composition of the refinin...

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Abstract

The invention discloses a process method for smelting high-aluminum sulfur-containing calcium-controlling steel. The method comprises converter smelting, LF refining, VD vacuum treatment and continuous casting processes. The invention solves the problem of the absorption rate of sulfur element by adding iron sulfur after tapping; LF refining adds sulfur powder to reduce the feeding of sulfur wire after VD breaks; LF refining controls the MI value and feeds calcium wire before entering VD, which can improve The form of sulfide, the sulfide changes from a chain shape to a spindle shape inside the steel, which improves the mechanical properties of the steel; VD vacuum treatment changes the feeding sequence, and the composite compound exists in the form of aluminum calcium salt with a low melting point , to prevent nozzle clogging during continuous casting. The smelting process of the present invention contains high-aluminum sulfur-containing calcium-controlling steel: S: 0.016-0.022%, Ca: 0.0015-0.0027%, Al: 0.013-0.021%; the number of continuous pouring furnaces is ≥ 4 furnaces, which improves production efficiency and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a smelting process for high-aluminum sulfur-containing calcium-controlling steel. Background technique [0002] With the development of special steel enterprises, downstream customers have stricter requirements on the mechanical processing performance of special steel products. In order to ensure the processing performance of customers, it is necessary to add sulfur to the steel. At the same time, a single sulfur element is in the shape of a slender chain in the steel. Yes, it has a certain impact on mechanical properties and impact toughness. Therefore, it is necessary to increase calcium to improve the form of sulfide. The composite compound exists in the form of a spindle in steel, which not only improves the form of sulfide, but also improves product performance. To increase the grain size in steel, downstream customers require a certain amount of aluminum in s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C21C7/00C21C7/06C21C7/10C22C38/02C22C38/04C22C38/06C22C38/44
CPCC21C7/0006C21C7/06C21C7/10C22C33/06C22C38/002C22C38/02C22C38/04C22C38/06C22C38/44Y02P10/20
Inventor 杨成宇刘宪民张玉亭安建平刘奇吴明翰贾霖马斌
Owner 石钢京诚装备技术有限公司
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