High-corrosion-resistant high-strength steel bar and its converter manufacturing method

A high-corrosion-resistant, high-strength steel bar technology, applied in the manufacture of converters, etc., can solve the problems of large heat loss and large amount of alloy addition, and achieve the effects of reducing alloy cost, avoiding excessive temperature drop, and improving yield

Active Publication Date: 2019-04-12
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of alloy added to smelt low-carbon high-chromium steel in the smelting process is relatively large, and the amount of ferrochrome added is 10 to 20 tons, or even more. The temperature drop of molten steel will reach more than 120°C, and the heat loss is too large.

Method used

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  • High-corrosion-resistant high-strength steel bar and its converter manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Using a 180t converter for smelting, the production steps are as follows:

[0048] (1) Desulfurization of molten iron: Take blast furnace molten iron with temperature T=1380°C, Si=0.3%, S=0.03%, and weight 162t, carry out desulfurization at KR desulfurization station, after desulfurization, S=0.001% in molten iron;

[0049] (2) Converter desiliconization and dephosphorization: the desulphurized molten iron obtained in step (1) is desiliconized and dephosphorized in a converter, adding 10kg / t of lime, 4kg / t of lightly burned dolomite, and 16kg / t of pellets, Control the basicity of the slag to 2.0; the oxygen pressure during the oxygen blowing process is 0.75MPa, the position of the blowing gun is 2.4m, and the position of the gun is reduced to 1.9m after 2 minutes of oxygen blowing, and the temperature is controlled at 1340-1360°C for 10 minutes after blowing oxygen. steel, obtain Si=0.01%, P=0.03% semi-steel molten steel;

[0050] (3) Converter decarburization and heat...

Embodiment 2

[0056] Using a 180t converter for smelting, the production steps are as follows:

[0057] (1) Desulfurization of molten iron: take temperature T=1405°C, Si=0.27%, S=0.033%, and weight 162.5t blast furnace molten iron, desulfurize at KR desulfurization station, after desulfurization, S=0.001% in molten iron;

[0058] (2) Desiliconization and dephosphorization of the converter: desiliconization and dephosphorization of the desulfurized hot metal obtained in step (1) in the converter, adding lime 11kg / t, lightly burned dolomite 3.5kg / t, pellets 19.5kg / t t, control the slag basicity to 2.0; the oxygen pressure during the oxygen blowing process is 0.8MPa, the blowing gun position is 2.4m, after 2 minutes of oxygen blowing, the gun position is reduced to 1.8m, and the oxygen blowing is controlled at 1330-1340°C for 7 minutes After tapping, obtain semi-steel molten steel with Si=0.008%, P=0.015%;

[0059] (3) Converter decarburization and heating: put the semi-steel molten steel obt...

Embodiment 3

[0065] Using a 180t converter for smelting, the production steps are as follows:

[0066] (1) Desulfurization of molten iron: Take blast furnace molten iron with temperature T=1380°C, Si=0.25%, S=0.04%, and weight 163t, and desulfurize it at the KR desulfurization station. After desulfurization, S=0.005% in molten iron;

[0067] (2) Desiliconization and dephosphorization of the converter: desiliconization and dephosphorization of the desulfurized hot metal obtained in step (1) in the converter, adding lime 8kg / t, lightly burned dolomite 5.5kg / t, pellets 13.5kg / t t, the basicity of the slag is controlled to be 1.5; the oxygen pressure during the oxygen blowing process is 0.7MPa, the position of the blowing gun is 2.4m, and the position of the gun is reduced to 2.1m after 2 minutes of oxygen blowing, and the oxygen blowing is controlled at a temperature of 1330-1350°C for 5 minutes After tapping, obtain semi-steel molten steel with Si=0.008%, P=0.025%;

[0068] (3) Converter de...

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Abstract

The invention discloses a high-corrosion-resistance high-strength steel bar and a converter manufacturing method thereof, and belongs to the technical field of steelmaking. According to the high-corrosion-resistance high-strength steel bar and the converter manufacturing method thereof, under the condition that special steel plant equipment does not need to be added for an ordinary converter steelmaking plant, the technological parameters are reasonably optimized, existing RH equipment is utilized, and then the production method of smelting special steel in the plain steel plant can be realized; specifically, during primary steel smelting, a converter is adopted for carrying out duplex operation, and the deep dephosphorization treatment effect of molten iron is ensured; and high-carbon ferrochrome is added at the later stage of converter smelting, the temperature and the carbon content of a molten pool are reasonably controlled for meeting the condition that the carbon element in the molten pool is oxidized before the chromium element, and therefore the yield of the chromium alloy in the converter is improved, the alloy cost is greatly reduced, and the problem that the temperature drop is too large due to the fact that a large amount of alloy is added in the converter tapping process is avoided.

Description

technical field [0001] The application belongs to the technical field of steelmaking, and in particular relates to a high-corrosion-resistant high-strength steel bar and a converter manufacturing method thereof. Background technique [0002] When smelting high-chromium corrosion-resistant steel, since the presence of chromium greatly reduces the activity of carbon and oxygen in molten steel, in order to achieve the purpose of decarburization and chromium preservation, one-step electric furnace or two-step electric furnace + VOD are mainly used at present. The above smelting processes require dephosphorization pretreatment of molten iron or the use of high-quality scrap steel, which requires high smelting costs or special equipment. When the converter smelts low-carbon high-chromium steel, it is necessary to add high-carbon ferrochrome in the converter process. In order to ensure the yield of chromium, the carbon requirement of tapping is more than 0.2%. Due to the high carb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06C22C38/02C22C38/04C22C38/38C22C38/18C22C33/04C21C5/28C21C7/10C21C7/068C21C5/36C21C1/02
CPCC21C1/02C21C5/28C21C5/36C21C7/0685C21C7/10C22C33/04C22C38/004C22C38/02C22C38/04C22C38/06C22C38/18C22C38/38
Inventor 邹长东孙凤梅赵家七周青峰麻晗
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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