Method used for realizing dispersion uniform distribution of bismuth element in alloy steel containing bismuth

A technology of uniform distribution and alloy steel, which is applied in the manufacture of converters, etc., can solve the problems of no effective method for bismuth alloy, difficulty in dispersing to uniform distribution, difficulty in dissolving bismuth, etc., and achieves easy operation, simple equipment, and high yield. The effect of rate stabilization

Inactive Publication Date: 2014-03-26
武汉钢铁有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Due to these characteristics, the bismuth added to the molten steel is easy to liquefy or gasify. Among them, the liquefied will sink to the bottom, and the gasified will become gas and emit, which makes bismuth difficult to dissolve in

Method used

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  • Method used for realizing dispersion uniform distribution of bismuth element in alloy steel containing bismuth

Examples

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Example Embodiment

[0024] Example 1:

[0025] The method for dispersing and evenly distributing bismuth in the bismuth-containing alloy steel of embodiment 1 includes the following steps:

[0026] 1) Hot metal desulfurization treatment to reduce the sulfur element in the hot metal to the design value.

[0027] 2) Converter smelting, after tapping, first add 161kg of Al-Fe alloy to the ladle furnace containing 78 tons of molten steel, then add 2340kg of Ferrosilicon alloy, and then add 80kg of ladle slag modifier to modify the ladle slag to make the steel slag TFe+MnO The weight is 2.3% of the total weight of the ladle slag.

[0028] 3) Ladle refining, the temperature of the molten steel is controlled at 1573℃, and the weight percentage of the chemical components in the molten steel is controlled at: C: 0.030%, Si: 2.8%, Mn: 0.06%, P: 0.018%, S: 0.024% , Als: 0.03%.

[0029] 4) After ladle refining, insert an alloy feed tube made of refractory material into the molten steel 175mm below the molten steel l...

Example Embodiment

[0033] Example 2:

[0034] The method for dispersing and uniformly distributing bismuth in the bismuth-containing alloy steel of embodiment 2 includes the following steps:

[0035] 1) Hot metal desulfurization treatment to reduce the sulfur element in the hot metal to the design value.

[0036] 2) Converter smelting, after tapping, add 202kg of Al-Fe alloy to the ladle furnace containing 78 tons of molten steel, then add 2730kg of Ferrosilicon alloy, and then add 118kg of ladle slag modifier to modify the ladle slag to make the steel slag TFe+MnO The weight is 2.7% of the total weight of the ladle slag.

[0037] 3) Ladle refining, the temperature of the molten steel is controlled at 1592℃, and the weight percentage of the chemical components in the molten steel is controlled at: C: 0.065%, Si: 3.1%, Mn: 0.10%, P: 0.018%, S: 0.024% , Als: 0.02%.

[0038] 4) After ladle refining, insert the alloy feed tube made of refractory material into the molten steel 295mm below the molten steel le...

Example Embodiment

[0042] Example 3:

[0043] The method for dispersing and uniformly distributing bismuth in the bismuth-containing alloy steel of embodiment 3 includes the following steps:

[0044] 1) Hot metal desulfurization treatment to reduce the sulfur element in the hot metal to the design value.

[0045] 2) Converter smelting, after tapping, first add 231kg ​​of Al-Fe alloy to the ladle furnace containing 78 tons of molten steel, then add 3118kg of Ferrosilicon alloy, and then add 153kg of ladle slag modifier to modify the ladle slag to make the steel slag TFe+MnO The weight is 2.6% of the total weight of the ladle slag.

[0046] 3) Ladle refining, the temperature of the molten steel is controlled at 1581℃, and the weight percentage of the chemical components in the molten steel is controlled at: C: 0.090%, Si: 3.5%, Mn: 0.19%, P: 0.018%, S: 0.026% , Als: 0.04%.

[0047] 4) After ladle refining, insert an alloy feed tube made of refractory material into the molten steel 220mm below the molten s...

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Abstract

The invention discloses a method used for realizing dispersion uniform distribution of bismuth element in alloy steel containing bismuth. The method comprises following steps: 1) molten iron is subjected to desulfuration; 2) converter smelting is performed, aluminum iron alloy and ferro-silicon alloy are added successively after steel tapping, and then a ladle slag modifier is added for ladle slag modification; 3) ladle slag is refined; 4) an alloy feed pipe made of a fire resistant material is inserted into steel liquid level so as to be 100 to 300mm below of the steel liquid level, and metal bismuth element, which possesses a low melting point, and granularity of 3 to 30nm, and is easy to gasify, is added into the molten iron using the alloy feed pipe, wherein adding amount of bismuth element is 0.5kg/t.s or less; 5) argon is taken as a bottom blowing gas of steel ladle, wherein intensity of argon is controlled at 30 to 100l/min.ts; and 6) a continuous casting platform is used for casting, protective atmosphere pouring is adopted for the whole course, and weak electromagnetic stirring is adopted in a secondary cooling section. The method is high in yielding rate; is capable of diffusing bismuth element in steel, so that uniform distribution is realized, excellent steel comprehensive properties are obtained, and properties of every parts of steel are uniform; and can be widely used in the field of molten steel smelting technology.

Description

Technical field [0001] The invention relates to the technical field of molten steel smelting, in particular to a method for dispersing and evenly distributing bismuth in bismuth-containing alloy steel. Background technique [0002] For some special alloy steels, a certain amount of bismuth in the steel can improve its performance. In order to make the performance of the special alloy steel products consistent everywhere, the bismuth must be evenly dispersed into the steel after being refined. This requires increasing the bismuth content. The dissolved amount of molten steel ensures that the metal bismuth is evenly distributed in the molten steel. [0003] The melting point of metallic bismuth is 271°C, the boiling point is 1560°C, the density is 9.8g / cm3, and the solubility in molten steel is 0.02%. It can be seen that the melting point and boiling point of metallic bismuth are low, and the solubility in molten steel is also low. In molten steel, the bismuth within the solubility ...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C1/02C21C5/28B22D11/115
Inventor 李大明骆忠汉魏伟柳志敏孙亮黄成红林立平郭小龙高洋丁金发
Owner 武汉钢铁有限公司
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