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Method for utilizing high-manganese molten iron to smelt ultra-low-manganese steel

A technology of ultra-low manganese steel and molten iron, applied in the field of iron and steel metallurgy

Active Publication Date: 2019-11-15
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the deficiency that the existing smelting process cannot use high-manganese molten iron with a manganese content higher than 0.40% to smelt ultra-low manganese steel, the present invention provides a method for smelting ultra-low manganese steel by using high-manganese molten iron, which is an original development LF furnace deep demanganization process, which can use high manganese molten iron as raw material to smelt molten steel with manganese content less than 0.02%.

Method used

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Embodiment 1

[0038]Using molten iron with a manganese content of 0.423% as the raw material, the double slag smelting process of the converter is used for smelting and demanganization. The low-temperature tapping of the converter link creates better thermodynamic conditions for further demanganization. The in-place temperature of the LF furnace is 1529°C. The Mn content in bit molten steel is 0.055%. During the LF smelting and refining process, 4269kg of lime and 329kg of modified formulations were added, and the cumulative heating was 31 minutes. The manganese content was 0.0165% when it was off-site. The specific parameters are shown in Table 1 below.

Embodiment 2

[0040] Using molten iron with a manganese content of 0.416% as the raw material, it is smelted using the double slag smelting process of the converter, and the steel is tapped at a low temperature in the converter link to create better thermodynamic conditions for further demanganization. The Mn content in molten steel is 0.049%. During the LF smelting and refining process, add 4442kg of lime, 346kg of reforming agent, heat for 33 minutes, and the manganese content is 0.0146% when off-site. The specific parameters are shown in Table 1 below.

Embodiment 3

[0042] Using molten iron with a manganese content of 0.457% as the raw material, the double slag smelting process of the converter is used for smelting, and the steel is tapped at a low temperature in the converter link to create better thermodynamic conditions for further demanganization. The Mn content in molten steel is 0.053%. During the LF smelting and refining process, add 3878kg of lime, 286kg of reforming agent, heat for 26 minutes, and the manganese content is 0.0136% when it is off-site. The specific parameters are shown in Table 1 below.

[0043] In the above three embodiments, the manganese content of molten iron in the furnace all exceeds 0.40%, and the manganese content cannot be reduced to below 0.05% after demanganization by the converter. After further demanganization by the LF furnace, the manganese content of the molten steel further decreases, and finally reaches the smelting standard, which is lower than 0.02%. The specific process parameters and process e...

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Abstract

The invention discloses a method for utilizing high-manganese molten iron to smelt ultra-low-manganese steel and belongs to the field of steel and iron metallurgy. The method for utilizing the high-manganese molten iron to smelt the ultra-low-manganese steel comprises the steps that in the converter process, the double-slag smelting technology is adopted for removing elements like manganese in most molten iron, the technology of converter low-temperature tapping and LF refining furnace deep manganese removing is adopted for further removing the manganese, on the condition that the molten ironentering the furnace is high-manganese molten iron with the manganese content higher than 0.40%, the manganese content in the molten iron is stably controlled below 0.02%, and the smelting requirementof the ultra-low manganese steel is met.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a method for smelting ultra-low manganese steel by utilizing high-manganese molten iron, in particular to a method for smelting ultra-low-manganese steel by utilizing high-manganese molten iron with a content greater than 0.40%. Background technique [0002] In order to meet the needs of today's market, high value-added special steel grades have very low requirements for Mn in molten steel, while the converter itself has limited demanganization capacity, and most steel mills have limited manganese content in molten iron due to the limitation of ore raw materials. At about 0.40%, when this molten iron is used to smelt ultra-low manganese steel (Mn≤0.02%), the minimum manganese content at the end of the converter is about 0.06%, which cannot meet the requirements of this type of steel. Under the above background, the technical problem of using high manganese hot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36C21C5/30C21C7/076C21C7/072
CPCC21C5/30C21C5/36C21C7/072C21C7/076Y02P10/20
Inventor 徐少华李志成徐涛赵鸣王俊刚韩浩田王进财
Owner BAOTOU IRON & STEEL GRP
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