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Continuous casting transition method between aluminum-containing steel and non-aluminum-containing steel

An aluminum-steel and continuous-casting technology is applied in the transition field of continuous-casting of aluminum-containing steel and non-aluminum-containing steel, which can solve the problems of large liquid level fluctuation, increase of waste billet amount, and large difference in oxygen content, so as to reduce the oxidizing property of molten steel. difference, the effect of improving the pourability of molten steel

Active Publication Date: 2022-01-11
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difference in aluminum content, the oxygen content of molten steel of the two steel types is quite different. In the transition furnace for continuous casting, the oxygen in the high oxidizing molten steel reacts with the aluminum in the low oxidizing molten steel to form fine dispersed high Al2O3 at melting point deteriorates the pourability of molten steel
On the one hand, the liquid level fluctuates and the amount of waste billets increases, and more seriously, it will cause a vicious accident that the nozzle nodule production will be interrupted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Adopting the primary smelting, refining, and continuous casting billet process of the converter; by optimizing the deoxidation and alloying process of the converter tapping, the control of the amount of slag, and the control points such as deoxidation, slagging, sulfur content and aluminum content in the refining process, Make aluminum-containing steel and non-aluminum-containing steel realize normal continuous pouring. Specific steps are as follows:

[0019] 1. Deoxidation and alloying process of converter tapping: the oxygen content of molten steel at the end of the transition furnace is 480ppm, and 1.0kg / ton of aluminum ingots are added for about 10 seconds after tapping for deoxidation, and then the second furnace of non-aluminum-containing steel and aluminum ingots The addition amount returns to the normal addition amount (0.6kg / ton steel).

[0020] 2. Control of the amount of slag falling: During the tapping process of the transition furnace, the conve...

Embodiment 2

[0025] Example 2: The primary smelting, refining, and continuous casting billet processes of the converter are also used; through optimizing the deoxidation alloying process of the converter tapping, the control of the slag amount, and the control points such as deoxidation, slagging, sulfur content and aluminum content during the refining process , so that aluminum-containing steel and non-aluminum-containing steel can be continuously poured normally. Specific steps are as follows:

[0026] 1. Deoxidation and alloying process of converter tapping: the oxygen content of molten steel at the end of the transition furnace is 660ppm, adding 1.0kg / ton of aluminum ingots for about 10 seconds after tapping for deoxidation, and then the second furnace of non-aluminum-containing steel and aluminum ingots The addition amount returns to the normal addition amount (0.6kg / ton steel).

[0027] 2. Control of the amount of slag falling: During the tapping process of the transition furnace, t...

Embodiment 3

[0032] Embodiment 3: adopt method of the present invention equally:

[0033] 1. Deoxidation and alloying process of converter tapping: the oxygen content of the molten steel at the end of the transition furnace is 380ppm, adding 1.0kg / ton of aluminum ingots for about 10 seconds after tapping for deoxidation, and then the second furnace of non-aluminum-containing steel and aluminum ingots The addition amount returns to the normal addition amount (0.6kg / ton steel).

[0034] 2. Control of the amount of slag falling: During the tapping process of the transition furnace, the converter operator uses the sliding plate (the most stringent control requirement of level 0), the slag blocking cone and the slag blocking plug to block the slag according to the monitoring system of the slag dropping of the converter tapping Operation, strictly controlled at the minimum amount of slag.

[0035] 3. Deoxidation during refining: In the early stage of refining, 140kg (1.4kg / ton of steel) silicon...

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PUM

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Abstract

The invention provides a continuous casting transition method of aluminum-containing steel and non-aluminum-containing steel, belonging to the technical field of molten steel fluidity control in molten steel smelting process. By optimizing the process of deoxidation and alloying in converter tapping, control of the amount of slag, and control points such as deoxidation, slag formation, sulfur content and aluminum content in the refining process, the method starts with the control of the oxidativeness of molten steel, and reduces the difference of the oxidizability of molten steel in the transition furnace. Improve the pourability of molten steel, so that the aluminum-containing steel and the non-aluminum-containing steel can achieve normal continuous casting and stable transition.

Description

technical field [0001] The invention belongs to the technical field of molten steel fluidity control in the molten steel smelting process, and in particular relates to a continuous casting transition method between aluminum-containing steel and non-aluminum-containing steel. Background technique [0002] At present, the competition in the iron and steel industry is becoming increasingly severe, and cost control is very important. In order to meet the needs of small batch orders in the market and reduce costs, there is an increasing demand for continuous casting of steel types with similar components but large differences in aluminum content in actual production. urgent. However, due to the difference in aluminum content, the oxygen content of molten steel of the two steel types is quite different. In the transition furnace for continuous casting, the oxygen in the high oxidizing molten steel reacts with the aluminum in the low oxidizing molten steel to form fine dispersed hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C21C7/064C21C7/076
CPCC21C7/06C21C7/064C21C7/076Y02P10/20
Inventor 刘义胡志勇许旭东韦士琨周士北
Owner NANJING IRON & STEEL CO LTD