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Aluminum-containing steel slow-release deoxidation method and application

An aluminum-steel, slow-release technology, applied in the field of metallurgy, can solve the problems of high material consumption and increased production costs of calcium alloy wires, and achieve the effects of reducing the amount of aluminum products, stabilizing the production process, and reducing production costs

Inactive Publication Date: 2017-10-13
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The deoxidation and alloying method of aluminum products is directly used in the converter tapping process. Although the deoxidation products are easily absorbed, the consumption of aluminum products, calcium alloy wires and other materials is high, and the production cost increases.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A detailed description of the production process of cold heading steel SWRCH22A based on HBIS Chenggang's 120-ton converter system.

[0030] The chemical composition and mass percentage of the aluminum-containing steel SWRCH22A in this embodiment are: C: 0.18%, Si: 0.07%, Mn: 0.75%, P: 0.025%, S: 0.015%, Als: 0.020%, and the rest are iron and inevitable impurities.

[0031] The method for slow-release deoxidation of aluminum-containing steel SWRCH22A in the present embodiment includes converter smelting and refining processes, and the specific steps are as follows:

[0032] (1) Converter smelting: add calcium carbide 0.8kg / ton steel to the ladle before tapping, and add calcium carbide 1.0kg / ton steel along with the steel flow during the tapping process; add Taiwan aluminum 2.2kg / ton steel; tapping temperature 1640 ℃, end point oxygen content 450ppm.

[0033] (2) Refining: Refining pit temperature is 1550℃, oxygen content of molten steel is 10ppm, and acid-soluble alum...

Embodiment 2

[0036] A detailed description of the production process of cold heading steel SWRCH22A based on HBIS Chenggang's 120-ton converter system.

[0037] The chemical composition and mass percentage of the aluminum-containing steel SWRCH22A in this embodiment are: C: 0.22%, Si: 0.03%, Mn: 0.95%, P: 0.020%, S: 0.011%, Als: 0.060%, and the rest are iron and inevitable impurities.

[0038] The method for slow-release deoxidation of aluminum-containing steel SWRCH22A in the present embodiment includes converter smelting and refining processes, and the specific steps are as follows:

[0039] (1) Converter smelting: add calcium carbide 0.8kg / ton steel to the ladle before tapping, and add calcium carbide 1.2kg / ton steel along with the steel flow during the tapping process; add Taiwan aluminum 2.3kg / ton steel; tapping temperature 1659 ℃, end point oxygen content 420ppm.

[0040] (2) Refining: Refining pit temperature is 1559℃, oxygen content of molten steel is 5ppm, and acid-soluble alumi...

Embodiment 3

[0043] A detailed description of the production process of cold heading steel SWRCH22A based on HBIS Chenggang's 120-ton converter system.

[0044] The chemical composition and mass percentage of the aluminum-containing steel SWRCH22A in this embodiment are: C: 0.20%, Si: 0.05%, Mn: 0.80%, P: 0.015%, S: 0.009%, Als: 0.030%, and the rest are iron and inevitable impurities.

[0045] The method for slow-release deoxidation of aluminum-containing steel SWRCH22A in the present embodiment includes converter smelting and refining processes, and the specific steps are as follows:

[0046] (1) Converter smelting: add calcium carbide 0.8kg / ton steel to the ladle before tapping, add calcium carbide 1.4kg / ton steel along with the steel flow during the tapping process; add Taiwan aluminum 2.3kg / ton steel; tapping temperature 1652 ℃, the end point oxygen content 416ppm.

[0047] (2) Refining: Refining pit temperature is 1564℃, oxygen content of molten steel is 6ppm, and acid-soluble alumi...

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Abstract

The invention discloses a slow-release deoxidation method for aluminum-containing steel and its application. The method includes converter smelting and refining processes; in the converter smelting process, calcium carbide is added to a ladle before and during tapping. The invention also discloses the application of the aluminum-containing steel slow-release deoxidation method in steelmaking. The present invention adopts the method of slow-release deoxidation of aluminum-containing steel, adding calcium carbide to the ladle before tapping, adding calcium carbide along with the steel flow during the tapping process, and utilizing the weak reducing property of the calcium carbide to slowly release and remove the steel during the entire tapping process. Oxygen in water can reduce the oxygen activity of molten steel to increase the yield of aluminum products, reduce the consumption of aluminum products, calcium alloy wire and other materials, and reduce the number of Al2O3 inclusions in molten steel. The deoxidation product of calcium carbide, CO, enhances the stirring ability of the molten steel during the discharge process, and plays a role in uniforming the composition of the molten steel. The invention has a stable production process, reduces production costs, and is suitable for smelting aluminum-containing steel with a silicon content of ≤0.1% and aluminum-containing steel with a carbon content of ≥0.1%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method and application for slow-release deoxidation of aluminum-containing steel. Background technique [0002] Aluminum is a strong deoxidizer in the metallurgical process, and its deoxidation product Al 2 O 3 Is a high melting point substance (melting point of 2054 ℃). In the process of converter tapping, the aluminum deoxidation product is coral-like and is easily adsorbed by the slag; during the refining process, the aluminum deoxidation product is in a disperse shape, and the particle size is small and not easy to be adsorbed by the steel slag. Dispersed Al in molten steel 2 O 3 During the pouring process of continuous casting, it is easy to accumulate at the nozzle of the tundish, resulting in flocculation of the nozzle, and in severe cases, the continuous casting machine may stop pouring. to avoid Al 2 O 3 In the industrial production process, calci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/00
CPCC21C7/06C21C7/0006C21C7/0056
Inventor 李亚厚胡心光梁新维康毅贾元海连庆
Owner HEBEI IRON AND STEEL
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