Method for reducing erosion rate of steel ladle slag line in production of deformed steel bar

Abstract

According to the method for producing the deformed steel bar and reducing the erosion rate of the steel ladle slag line, the content of Al2O3 in steel ladle top slag is controlled to be about 15%, the content of MgO is controlled to be about 10%, the content of (FeO + MnO) is controlled to be 2.6% or below, the alkalinity (CaO / SiO2) is controlled to be 1.8-2.0, the foaming performance of the steel ladle top slag can be effectively improved, the submerged arc effect is improved, and the service life of the steel ladle top slag is prolonged. The heating rate is increased, the smelting period is shortened, and the influence of electric arc on slag line bricks is reduced. In addition, by increasing the content of MgO, the solution loss rate of magnesia in the slag line magnesia carbon brick can be effectively inhibited, the erosion rate of the slag line brick is reduced, and the ladle life of a steel ladle is prolonged.

Description

technical field

[0001] The invention relates to the field of metallurgy, in particular to a method for producing screw steel to reduce the erosion rate of ladle slag lines. Background technique

[0002] In the context of "carbon neutrality", low molten iron ratio can increase steel output and reduce production costs, which is an effective way to enhance the competitiveness of iron and steel enterprises. Under the condition of low molten iron ratio, the heat of the converter is insufficient, and the LF refining furnace needs to be heated quickly to supplement the heat. Under the low molten iron ratio, the FeO content in the final converter slag is high (15-22%), the foaming performance of the ladle top slag is poor, the submerged arc during the electrification process is poor, and the heating efficiency is low (average 2-3℃ / min), The long energization and heating time leads to a long smelting cycle, an increase in the erosion rate of the ladle slag line, and an increased ris...

Examples

example 1

[0020] Example 1: In the first half of April 2021, the process path for producing rebar BOF-AR-LF-CC (BOF-converter, AR-argon station, LF-ladle refining furnace, CC-continuous caster), ladle top slag (FeO +MnO) content of 4.1%, Al 2 O 3 The content is 7.7%, the MgO content is 8%, the basicity (CaO / SiO2) is 1.37, the erosion rate of the ladle slag line brick is 4.7mm / furnace, and the heating rate is 2.2℃ / min. The composition of molten steel is shown in Table 2

[0021] Table 2 Molten steel composition table (unit wt%)

[0022]

[0023] (The conventional production process of rebar is BOF-AR-CC. Under this process condition, the tapping temperature of the converter needs to be high (1640-1660 ° C), and the heat of the converter is seriously insufficient under the condition of low molten iron ratio. If the tapping temperature is increased to 1640 -1660℃, all the consumption indicators of the converter and the safety of furnace conditions will be greatly affected, and the ov...

technical field

[0001] The invention relates to the field of metallurgy, in particular to a method for producing screw steel to reduce the erosion rate of ladle slag lines. Background technique

[0002] In the context of "carbon neutrality", low molten iron ratio can increase steel output and reduce production costs, which is an effective way to enhance the competitiveness of iron and steel enterprises. Under the condition of low molten iron ratio, the heat of the converter is insufficient, and the LF refining furnace needs to be heated quickly to supplement the heat. Under the low molten iron ratio, the FeO content in the final converter slag is high (15-22%), the foaming performance of the ladle top slag is poor, the submerged arc during the electrification process is poor, and the heating efficiency is low (average 2-3℃ / min), The long energization and heating time leads to a long smelting cycle, an increase in the erosion rate of the ladle slag line, and an increased ris...

Examples

example 1

[0020] Example 1: In the first half of April 2021, the process path for producing rebar BOF-AR-LF-CC (BOF-converter, AR-argon station, LF-ladle refining furnace, CC-continuous caster), ladle top slag (FeO +MnO) content of 4.1%, Al 2 O 3 The content is 7.7%, the MgO content is 8%, the basicity (CaO / SiO2) is 1.37, the erosion rate of the ladle slag line brick is 4.7mm / furnace, and the heating rate is 2.2℃ / min. The composition of molten steel is shown in Table 2

[0021] Table 2 Molten steel composition table (unit wt%)

[0022]

[0023] (The conventional production process of rebar is BOF-AR-CC. Under this process condition, the tapping temperature of the converter needs to be high (1640-1660 ° C), and the heat of the converter is seriously insufficient under the condition of low molten iron ratio. If the tapping temperature is increased to 1640 -1660℃, all the consumption indicators of the converter and the safety of furnace conditions will be greatly affected, and the ov...

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