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Low-oxygen refining slag system for smelting steel and preparation method and application of low-oxygen refining slag system

A technology for refining slag and molten steel, which is applied in the field of iron and steel smelting to achieve the effects of reducing the number of refurbishments, good fluidity, and avoiding the formation of oxide inclusions

Inactive Publication Date: 2021-11-23
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increasing demand of users for high-quality, high-performance special steel, more stringent requirements are put forward for the oxygen content of steel products. The oxygen content in steel needs to be controlled below 0.0010%. Refining slags removed below 0.0010% have not been reported yet

Method used

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  • Low-oxygen refining slag system for smelting steel and preparation method and application of low-oxygen refining slag system
  • Low-oxygen refining slag system for smelting steel and preparation method and application of low-oxygen refining slag system

Examples

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Effect test

Embodiment 1

[0029] A low-oxygen refining slag system for steelmaking, the main components of which are as follows:

[0030] CaO 8%, SiO 2 3%, MgO 20%, Al 2 o 3 16%, CaF 2 53%.

[0031] A method for preparing a low-oxygen refining slag system for smelting steel, comprising the following steps:

[0032] Step 1, prepare the raw materials, dry the raw materials, weigh them according to the proportioning requirements, and mix them evenly;

[0033] Step 2, the uniformly mixed raw materials are melted in a melting furnace protected by an argon atmosphere, the melting temperature is controlled between 1600°C, and the melting time is 20 minutes;

[0034] Step 3: After the smelting is completed, the pre-melted slag system is taken out from the melting furnace and quenched with water, and the pre-melted slag system is mechanically crushed to obtain the refined slag system.

[0035] The refining slag after step three mechanical crushing is 16 mesh.

[0036] An application of a low-oxygen re...

Embodiment 2

[0039] A low-oxygen refining slag system for steelmaking, the main components of which are as follows:

[0040] CaO 12%, SiO 2 4%, MgO 17%, Al 2 o 3 13%, CaF 2 54%.

[0041] A method for preparing a low-oxygen refining slag system for smelting steel, comprising the following steps:

[0042] Step 1, prepare the raw materials, dry the raw materials, weigh them according to the proportioning requirements, and mix them evenly;

[0043] Step 2, the uniformly mixed raw materials are melted in a melting furnace protected by an argon atmosphere, the melting temperature is controlled between 1610°C, and the melting time is 18 minutes;

[0044] Step 3: After the smelting is completed, the pre-melted slag system is taken out from the melting furnace and quenched with water, and the pre-melted slag system is mechanically crushed to obtain the refined slag system.

[0045] The refining slag after step three mechanical crushing is 17 mesh.

[0046]In this example, the same deoxida...

Embodiment 3

[0048] A low-oxygen refining slag system for steelmaking, the main components of which are as follows:

[0049] CaO 14%, SiO 2 6%, MgO 17%, Al 2 o 3 8%, CaF 2 55%.

[0050] A method for preparing a low-oxygen refining slag system for smelting steel, comprising the following steps:

[0051] Step 1, prepare the raw materials, dry the raw materials, weigh them according to the proportioning requirements, and mix them evenly;

[0052] Step 2, the uniformly mixed raw materials are melted in a melting furnace protected by an argon atmosphere, the melting temperature is controlled between 1620°C, and the melting time is 15 minutes;

[0053] Step 3: After the smelting is completed, the pre-melted slag system is taken out from the melting furnace and quenched with water, and the pre-melted slag system is mechanically crushed to obtain the refined slag system.

[0054] The refining slag after step three mechanical crushing is 17 mesh.

[0055] In this example, the same deoxida...

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Abstract

The invention discloses a low-oxygen refining slag system for smelting steel and a preparation method and application of the low-oxygen refining slag system, and belongs to the field of steelmaking. The low-oxygen refining slag system is prepared from the following components in percentage by weight: 8%-15% of CaO, 3%-7% of SiO2, 17%-21% of MgO, 8%-16% of Al2O3 and 50%-60% of CaF2. The low-oxygen refining slag system is good in flowing property, is favorable for floating and removing inclusions in molten steel, can effectively control the oxygen content in the steel to be 0.0007% or below, avoids the generation of large-size oxide inclusions in the steel, and meets the application requirements of the steel under various service conditions. The low-oxygen refining slag system is reasonable in component preparation, simple in preparation method and low in use cost.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a low-oxygen refining slag system for smelting steel and its preparation method and application. Background technique [0002] Oxygen usually exists in molten steel in the form of non-metallic inclusions and dissolved oxygen, which mainly comes from raw materials entering the furnace and oxygen-blowing steelmaking and other production processes. The oxygen content at the end point of molten steel in the converter smelting process can reach 0.16% or even higher. Measures should be taken to reduce the oxygen content in the molten steel during the refining process outside the furnace, otherwise the oxygen in the molten steel will react with alloy elements to form non-metallic inclusions, which will damage the quality and performance of steel products. [0003] At present, the oxygen content in molten steel can be significantly reduced by means of precipitation deoxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06
CPCC21C7/06
Inventor 李少英郭汉杰习小军窦冠雄
Owner UNIV OF SCI & TECH BEIJING
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