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A kind of smelting process of converter low-phosphorus steel
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A low-phosphorus steel and converter technology, used in the manufacture of converters and other directions, can solve problems such as flue gas data that few studies focus on, and achieve the effects of improving the slag removal effect, preventing back-drying, and improving the dephosphorization effect.
Active Publication Date: 2022-05-27
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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Problems solved by technology
[0003] However, in addition to optimizing the operation based on the flue gas data in the converter smelting process to improve the splash back drying, few studies have focused on the role of flue gas data in optimizing the smelting operation and improving the dephosphorization effect of the converter.
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Embodiment 1
[0017] S1: Using a 120t top-bottom double blowing converter, the amount of slag remaining after tapping is 5t, the amount of clean scrap added is 27t, and 108t of molten iron after desulfurization is added. The main components of molten iron are C: 4.57%, Si: 0.30%, P : 0.105%, S: 0.002%, molten iron temperature: 1350°C.
[0018] S2: After blowing, the oxygen lance position is set to 1900mm, and the oxygen lance flow is set to 28500m 3 / h, the argon bottom blowing intensity is set to 0.1m 3 / t﹒ min, 2200kg of lime and 300kg of iron oxide balls were added after ignition. At this time, the CO content in the furnace gas was kept above 15%, and it did not change much with the progress of blowing. 2 The content gradually increased.
[0019] S3: When the CO content in the flue gas begins to increase, the gun position is controlled at 1800mm, and 800kg of lightly burned dolomite is added. When the CO content in the flue gas increases to 30%, 300kg of lime is added. When the CO con...
Embodiment 2
[0021] S1: Using a 120t top-bottom double blowing converter, the amount of slag remaining after tapping is 4.5t, the amount of clean scrap added is 25t, and 111t of molten iron after desulfurization is added. The main components of molten iron are C: 4.57%, Si: 0.55%, P: 0.105%, S: 0.002%, molten iron temperature: 1320°C.
[0022] S2: After blowing, the oxygen lance position is set to 1950mm, and the oxygen lance flow is set to 28500m 3 / h, the argon bottom blowing intensity is set to 0.1m 3 / t﹒ min, add 2500kg of lime and 500kg of iron oxide balls after ignition. At this time, the CO content in the furnace gas is close to 0, and there is little change with the progress of blowing, while the CO content in the flue gas is close to 0. 2 The content gradually increased. Add 300kg iron oxide balls and 300kg lime 1min after opening and blowing, and continue to add 300kg iron oxide balls and 300kg lime after 2min opening and blowing.
[0023] S3: When the CO content in the flue ...
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Abstract
The application discloses a converter low-phosphorus steel smelting process. According to the converter flue gas data monitored in real time, it is composed of the converter slag discharge stage control step and the converter normal smelting stage control step. Control the basicity of slag in the early stage of the converter and the heating rate of the molten pool. When the decarburization rate reaches the maximum value, add appropriate amount of oxidizing pellets in stages according to the change of CO content in the converter flue gas to control the degree of back-drying of the slag, and finally tap the furnace. According to the change of CO content in the flue gas in the converter smelting process, the present invention controls the position of the oxygen lance, the bottom blowing mode, and the way of adding lime and iron oxide balls to improve the dephosphorization effect of the converter smelting process, and the tapping conditions at the end point can be satisfied at the same time C ≥ 0.08%, P ≤ 0.008%, T ≥ 1630 ℃ high cleanliness low phosphorus steel converter end point control conditions.
Description
technical field [0001] The present application relates to the technical field of steelmaking, and in particular, to a smelting process for smelting low-phosphorus steel by utilizing converter flue gas data. Background technique [0002] The converter is the core of long-process steel production and is responsible for providing molten steel with qualified temperature and composition for the entire smelting process. For traditional large and medium-sized converters, the sub-lance is mainly used to obtain the temperature and composition information of the smelting process, but the reaction situation in the converter is unclear at about 85% of the smelting time, resulting in unstable dephosphorization effect of the converter and overblowing at the end of the converter. phenomenon, resulting in a decline in product quality and an increase in production costs. In recent years, with the advancement of technology, flue gas analysis technology has been more and more widely used in c...
Claims
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Application Information
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