A method for producing low-phosphorus steel with a single-converter double-oxygen lance

A technology of double oxygen lance and low-phosphorus steel, which is applied in the manufacture of converters, etc., can solve the problems of unstable dephosphorization effect, achieve stable dephosphorization effect, prevent excessive foaming, and reduce splashing

Active Publication Date: 2018-01-12
CISDI SHANGHAI ENG CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the deficiencies in the prior art described above, the object of the present invention is to provide a method for producing low-phosphorus steel with a single converter double oxygen lance, to solve the problem of unstable dephosphorization effect in the converter steelmaking process

Method used

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  • A method for producing low-phosphorus steel with a single-converter double-oxygen lance
  • A method for producing low-phosphorus steel with a single-converter double-oxygen lance
  • A method for producing low-phosphorus steel with a single-converter double-oxygen lance

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Embodiment 1

[0071] In this embodiment, medium-high phosphorus hot metal and light and thin steel scrap are used as raw materials, and the main components of the hot metal are: C 4.2%, Si 0.42%, Mn 0.38%, P 0.146%, S 0.008%. The temperature of molten iron is 1327°C. The scrap ratio is 7.1%. The steel scrap and molten iron are sequentially added to the top-bottom combined blowing converter. Add slag material according to the final slag alkalinity of 2.0. Afterwards, the dephosphorization powder spraying oxygen lance is used for smelting operation, and the oxygen supply intensity of the oxygen lance is 2.0Nm 3 / (min·t), the oxygen blowing time is 8min, and the lime powder is injected while supplying oxygen, and the powder injection speed is 300kg / min. Average bottom blow strength 0.1Nm 3 / (min t). Sampling analysis after smelting in the dephosphorization period shows that the semi-steel [P] content is 0.027%, the semi-steel [C] content is 3.08%, and the semi-steel temperature is 1380°C....

Embodiment 2

[0073] In this example, medium-high phosphorus molten iron and light and thin steel scrap are used as raw materials, and the main components of the molten iron are: C 4.2%, Si 0.30%, Mn 0.33%, P 0.131%, S 0.005%. The temperature of molten iron is 1329°C. The scrap ratio is 6.2%. The steel scrap and molten iron are sequentially added to the top-bottom combined blowing converter. Add slag material according to the final slag alkalinity of 2.2. Afterwards, the dephosphorization oxygen lance is used for smelting operation, and the oxygen supply intensity of the oxygen lance is 2.2Nm 3 / (min·t), the oxygen blowing time is 8.5min, and the lime powder is injected while supplying oxygen, and the powder injection speed is 600kg / min. Average bottom blow strength 0.1Nm 3 / (min t). Sampling analysis after smelting in the dephosphorization period shows that the content of semi-steel [P] is 0.023%, the content of semi-steel [C] is 2.98%, and the temperature of semi-steel is 1400°C. Aft...

Embodiment 3

[0075] In this example, medium-high phosphorus molten iron and light and thin steel scrap are used as raw materials, and the main components of the molten iron are: C 4.2%, Si 0.64%, Mn 0.20%, P 0.18%, S 0.006%. The temperature of molten iron is 1337°C. The scrap ratio is 10.7%. The steel scrap and molten iron are sequentially added to the top-bottom combined blowing converter. Add slag material according to the final slag alkalinity of 2.5. Afterwards, the dephosphorization oxygen lance is used for smelting operation, and the oxygen supply intensity of the oxygen lance is 2.2Nm 3 / (min·t), the oxygen blowing time is 9.2min, and the lime powder is injected while supplying oxygen, and the powder injection speed is 800kg / min. Average bottom blow strength 0.1Nm 3 / (min t). Sampling analysis after smelting in the dephosphorization period shows that the semi-steel [P] content is 0.028%, the semi-steel [C] content is 3.2%, and the semi-steel temperature is 1370°C. After the sl...

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Abstract

The invention provides a method for producing low-phosphorous steel by single converter and double oxygen lances. Single top-bottom combined blowing converter is adopted as a processing container; a dephosphorization powder spraying oxygen lance and a decarburization double-current oxygen lance are used for spraying successively; and the deslagging operation is performed midway for solving the problem of unstable dephosphorization effect in the converter steel smelting process. The dephosphorization powder spraying oxygen lance and the decarburization double-current oxygen lance both have secondary oxygen current runners positioned in the centers, and main oxygen current channels positioned at the outer peripheries of the secondary oxygen current channels; the main oxygen current channel of the dephosphorization powder spraying oxygen lance keeps supersonic jet flows, and the secondary oxygen current channel conveys powder for quickly deslagging; and the main oxygen current channel of the decarburization double-current oxygen lance keeps supersonic jet flows, and the secondary oxygen current channel performs flow adjustment to adapt to the oxygen supply strength in each phase. Compared with a traditional process, the method is stable in dephosphorization effect and high in dephosphorization rate, facilitates the converter to adopt medium and high-phosphorous molten iron to smelt, and can stably produce such high-grade variety steel as low-phosphorous and ultralow-phosphorous steel.

Description

technical field [0001] The invention belongs to the field of steelmaking in the metallurgical industry, and in particular relates to a method for producing low-phosphorus steel with a double oxygen lance in a single converter. Background technique [0002] With the emergence of molten iron pretreatment injection and stirring method, the desulfurization process with high efficiency and low cost has gradually matured. However, how to economically and effectively remove the phosphorus in high-phosphorus (initial phosphorus content ≥ 0.15%) molten iron to an extremely low level (final phosphorus content ≤ 0.01%, or even lower) to produce high value-added products is currently a problem in iron and steel smelting. Problems with the process. At present, the dephosphorization technologies commonly used in the production of low-phosphorus steel (end-point phosphorus content ≤ 0.01%) in the converter process include the converter double-slag method and the converter double-connectio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/32C21C5/46
CPCC21C5/32C21C5/4606
Inventor 游香米刘向东王勇吴令
Owner CISDI SHANGHAI ENG CO LTD
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