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A method for increasing the service life of a vanadium-containing titanium semi-steel steelmaking converter
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A steelmaking converter and furnace age technology, applied in the manufacture of converters, etc., can solve problems such as ash plugging, reduce furnace age, and affect production continuity
Active Publication Date: 2015-09-09
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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However, its disadvantage is that during the steelmaking process of vanadium-titanium semi-steel, the electrostatic precipitator is prone to failures such as explosion venting, pipe scaling, and ash plugging. Furnace lining, reduce furnace life
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example 1
[0031] Prepare the following materials:
[0032] Semi-steel: 220t; scrap steel: 10t, of which light and thin steel scrap accounts for 30% of the scrap steel; slagging material: 12.5t, of which, active lime 4t, high magnesium lime 5t, containing SiO 2 3.5t of acidic slagging materials.
[0033] 6 minutes before the start of oxygen blowing, 10 tons of steel scrap (among them, 3 tons of light and thin steel scrap) were added to the converter, and 3 minutes before the start of oxygen blowing, 220 tons of semi-steel were poured in. Use an oxygen lance to supply oxygen to the molten steel. The start point of the oxygen supply operation is the timing zero: when the oxygen blowing starts for 60 seconds, the oxygen supply intensity is 1.83m 3 / min·t, the gun position is 2000mm; when the oxygen blowing starts for 60-90 seconds, the oxygen supply intensity is 2.58m 3 / min·t, the gun position is 1700mm; 90s after the start of oxygen blowing, the oxygen supply intensity is 3.5m 3 / min·t...
example 2
[0038] Prepare the following materials:
[0039] Semi-steel: 220t; scrap steel: 13t, of which light and thin steel scrap accounts for 45% of the scrap steel; slagging material: 13t, of which, active lime 3.5t, high magnesium lime 6t, containing SiO 2 3.5t of acidic slagging materials.
[0040] 6 minutes before the start of oxygen blowing, 6 tons of steel scrap (including 2.4 tons of light and thin steel scrap) were added to the converter, and 3 minutes before the start of oxygen blowing, 200 tons of semi-steel were poured into it. Use an oxygen lance to supply oxygen to the molten steel. The start point of the oxygen supply operation is the timing zero: when the oxygen blowing starts for 60 seconds, the oxygen supply intensity is 1.92m 3 / min·t, the gun position is 2100mm; when the oxygen blowing starts for 60-90 seconds, the oxygen supply intensity is 2.83m 3 / min·t, the gun position is 1800mm; 90s after the start of oxygen blowing, the oxygen supply intensity is 3.67m 3 / ...
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Abstract
A method for prolonging the life of a vanadium-and-titanium-containing semi-steel making converter comprises the steps as follows: scrap steel is loaded in the converter, then semi-steel is poured, slag making materials are added, an oxygen lance is inserted into the converter from the top of the converter, oxygen is blown in, decarburization, dephosphorization and desulphurization processes are performed to obtain molten steel, and oxygen supply intensities and lance positions of the oxygen lance are as follows: when oxygen blowing is started for 60 s, the oxygen supply intensity is 1.75-2m<3> / min.t, and the lance position is 1900-2200 mm; when oxygen blowing is started for 60-90 s, the oxygen supply intensity is 2.5-2.92 m<3> / min.t, and the lance position is 1600-1900 mm; and after oxygen blowing is started for 90 s, the oxygen supply intensity is 3.42-3.75 m<3> / min.t, and the lance position is 1400-1700 mm. By means of the method, the problems of corrosion caused by the molten steel to a converter lining, explosion venting of converter dry dedusting, pipeline scaling and the like can be effectively solved; and the life of the converter with the method is prolonged to about 6000 times from original 1478 times.
Description
technical field [0001] The invention relates to a method for increasing the service life of a vanadium-titanium semi-steel steelmaking converter, more specifically, the invention relates to a method capable of greatly increasing the service life of a vanadium-titanium semi-steel steelmaking converter. Background technique [0002] The carbon content of the semi-steel material is in the range of 1.4-2.3%, and the mechanical properties are between steel and iron. It is usually used to manufacture cast steel rolls, called semi-steel rolls, which have the characteristics of small hardness drop and high wear resistance. Vanadium and titanium mainly appear in the form of carbides, nitrides and carbonitrides in steel. These compounds dissolve into austenite at high temperatures and inhibit the growth of austenite grains when the temperature decreases. At the same time, some vanadium and titanium carbides are precipitated, which play a role in precipitation strengthening. [0003] ...
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