A Shallow Treatment Process Applicable to SPHC Low Carbon Series Steels

A treatment process and a series of technologies, applied in the field of shallow treatment process, can solve the problems of shortening the refining time of LF, difficulty in making white slag and adjusting slag, reducing costs and energy consumption, and achieving shortening of refining and soft blowing time, extension of floating time, The effect of reducing electricity consumption

Active Publication Date: 2022-03-11
SHANDONG IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of overoxidation of molten steel in converter tapping and difficulty in adjusting white slag in LF refining stage, long power-on time, and slow production rhythm. The content of acid-soluble aluminum is controlled step by step to reduce or avoid the peroxidation of molten steel in converter steelmaking; and in the tapping process, synthetic slag is added at the same time as a deoxidation accelerator to effectively adjust the composition and proportion of slag samples, so that the final slag of the converter can be directly Form yellow and white slag, LF refining stage does not need slag making, simplifies the steps of LF refining, shortens the time of LF refining, thus releases the capacity of LF refining furnace, and reduces the power consumption and deoxidizer addition in the LF refining stage, Reduced cost and energy consumption

Method used

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  • A Shallow Treatment Process Applicable to SPHC Low Carbon Series Steels
  • A Shallow Treatment Process Applicable to SPHC Low Carbon Series Steels
  • A Shallow Treatment Process Applicable to SPHC Low Carbon Series Steels

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Embodiment 1

[0047] A shallow treatment process suitable for SPHC low-carbon series steel grades of the present invention mainly lies in optimizing the pretreatment of molten steel in the tapping process to form yellow and white slag, and performing shallow treatment on the pretreated molten steel in the LF refining furnace to achieve The purpose of shortening the LF refining time. Include the following steps:

[0048] S1. Hot metal pretreatment: The hot metal is desulfurized and slag-removed through the KR desulfurization station, so that the sulfur content of the hot metal is ≤0.015%.

[0049] S2. Converter smelting: Put the molten iron treated in step S1 into a converter for smelting.

[0050] S3. Converter end point control: The converter end point control temperature is 1643°C, the sub-lance fixed carbon is 0.045%, and the free oxygen of molten steel is 687ppm.

[0051] S4. Pretreatment of molten steel in converter tapping process:

[0052] During the tapping process, 409kg of Al-M...

Embodiment 2～ Embodiment 4

[0066] The process steps are the same as in Example 1, except that the converter endpoint control and LF refining furnace process parameters are fine-tuned, and the specific parameters are shown in Table 1 and Table 3.

[0067] After the converter treatment in Examples 1 to 4, the slag sample entering the station of the LF refining furnace has formed alkaline slag, that is, reducing slag, SiO 2 The content is significantly reduced, the total iron content in the slag is less than 1.5%, and yellow and white slag has been formed. The specific slag sample composition is shown in Table 2.

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Abstract

The invention belongs to the technical field of iron and steel smelting, and in particular relates to a shallow treatment process suitable for SPHC low-carbon series steel grades. The invention provides a shallow treatment process suitable for SPHC low-carbon series steels, through the control of the composition and temperature of the end point of the converter and the control of the content of acid-soluble aluminum in the deoxidation and alloying stage of the converter tapping, reducing or avoiding the problems of converter steelmaking Molten steel is peroxidized; and during the tapping process, synthetic slag is added while deoxidation accelerator is added to effectively adjust the composition and ratio of slag samples, so that the final slag of the converter can directly form yellow and white slag, and the LF refining stage does not need slagging and slagging, which simplifies the LF process. The refining step shortens the LF refining time, thereby releasing the capacity of the LF refining furnace. In addition, it reduces the power consumption and deoxidizer addition in the LF refining stage, reducing costs and energy consumption.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a shallow treatment process suitable for SPHC low-carbon series steel grades. Background technique [0002] When a steel mill adopts the BOF-LF-CC process path to smelt SPHC and other low-carbon series steel grades, synthetic slag is added for slag washing when the converter puts steel into the furnace. Carry out work such as temperature raising, composition fine-tuning, slag making, etc. Due to the operation level of the personnel in front of the furnace, the temperature and carbon content of the low-carbon steel series such as SPHC are quite different, and the molten steel is seriously over-oxidized when the converter is tapped, and the ladle top slag has high oxidation and low alkalinity. In the LF refining stage, it is necessary to modify the top slag of the ladle. In order to produce white slag, a large amount of aluminum particles and calcium carbide need t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C21C1/02C21C7/06C21C5/36C21C7/064
CPCC22C33/06C21C1/02C21C7/06C21C5/36C21C7/0006C21C7/0056C21C7/064
Inventor 刘俊宝宁伟王强尚游李少帅
Owner SHANDONG IRON & STEEL CO LTD
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