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Method for reducing converter semi-steel-making deoxidization cost

A converter and low-cost technology, applied in the field of steelmaking, can solve the problems of large consumption of aluminum-iron alloys and increased production costs, and achieve the effect of reducing deoxidation cost and good deoxidation effect

Inactive Publication Date: 2017-09-08
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, aluminum-iron alloys are generally used to deoxidize molten steel, and the consumption of aluminum-iron alloys is relatively large, which increases production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Steelmaking according to the method described in the above technical scheme, without deoxidation, the molten steel composition obtained is: C3.2wt%, Si 0.015wt%, Mn 0.02wt%, P 0.06wt%, S≤0.015wt%; oxygen content is 650ppm.

[0066] Carry out deoxidation in the steelmaking process described in above-mentioned technical scheme, concrete method is:

[0067] 125 tons of molten steel steelmaking, adding 237Kg of aluminum-iron alloy for deoxidation at 1 / 3 of tapping, the oxygen content in molten steel after deoxidation is 280ppm; after tapping, 390m of aluminum wire is fed for deoxidation, and the oxygen content in molten steel is 5ppm. (The oxygen content in the molten steel is tested by the converter sub-lance, and the converter sub-lance is equipped with a constant temperature oxygen measuring probe)

Embodiment 2

[0069] Steelmaking according to the method described in the above technical scheme, without deoxidation, the molten steel composition obtained is: C3.6wt%, Si0.022wt%, Mn 0.03wt%, P 0.07wt%, S≤0.015wt%; oxygen content is 660ppm.

[0070] Carry out deoxidation in the steelmaking process described in above-mentioned technical scheme, concrete method is:

[0071] 135 tons of molten steel steelmaking, adding 240Kg of aluminum-iron alloy for deoxidation at 1 / 3 of the tapping, the oxygen content in the molten steel is 260ppm after deoxidation; after the tapping is completed, 380m of aluminum wire is fed for deoxidation, and the oxygen content in the molten steel is 3ppm. (The oxygen content in the molten steel is tested by the converter sub-lance, and the converter sub-lance is equipped with a constant temperature oxygen measuring probe)

Embodiment 3

[0073] Steelmaking according to the method described in the above technical scheme, without deoxidation, the molten steel composition obtained is: C4.1wt%, Si0.03wt%, Mn 0.04wt%, P 0.08wt%, S≤0.015wt%; oxygen content is 680ppm.

[0074] Carry out deoxidation in the steelmaking process described in above-mentioned technical scheme, concrete method is:

[0075] 145 tons of molten steel steelmaking, adding 255Kg of aluminum-iron alloy for deoxidation at 1 / 3 of the tapping, the oxygen content in the molten steel is 270ppm after deoxidation; after the tapping is completed, 390m of aluminum wire is fed for deoxidation, and the oxygen content in the molten steel is 8ppm. (The oxygen content in the molten steel is tested by the converter sub-lance, and the converter sub-lance is equipped with a constant temperature oxygen measuring probe)

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Abstract

The invention provides a method for reducing the converter semi-steel-making deoxidization cost. The method comprises the steps that aluminum-iron alloy is added into molten steel for deoxidization at first, and aluminum wires are added into the deoxidized material to continue to carry out deoxidization, wherein the mass ratio of the aluminum-iron alloy to the aluminum wires is (2-4):1. Compared with the prior art, the deoxidization method for semi-steel making is provided, the aluminum-iron alloy is adopted for carrying out primary deoxidization on molten steel, then, the aluminum wires are adopted for carrying out further deoxidization on the molten steel, the consumption ratio of the aluminum-iron alloy to the aluminum wires is reasonably controlled, and the deoxidization cost is reduced on the condition of ensuring the good deoxidization effect under the cooperation effect of the aluminum-iron alloy and the aluminum wires.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for reducing the deoxidation cost of converter semi-steelmaking. Background technique [0002] Panzhihua Iron and Steel Vanadium Converter adopts semi-steel steelmaking, because the Si content in semi-steel is lower, the C content is lower than molten iron and the heat source is insufficient, so compared with molten iron steelmaking, semi-steel steelmaking needs to add SiO 2 , FeO and Fe 2 o 3 In the later stage of smelting, more oxygen needs to be supplemented and blown to meet the temperature control requirements of the end point, resulting in lower C content in molten steel, higher oxygen activity, and higher end point oxygen content in semi-steel making. [0003] In the prior art, aluminum-iron alloys are generally used to deoxidize molten steel, and the consumption of aluminum-iron alloys is large, which increases production costs. In order to reduce producti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06
CPCC21C7/06C21C7/0006C21C7/0056
Inventor 陈路曾建华陈均梁新腾张彦恒黄德胜
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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