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Method for increasing manganese in high manganese steel smelting process

A smelting process, high manganese steel technology, applied in the field of high manganese steel smelting, can solve the problems of long heating time, aggravated ladle refractory material damage, molten steel nitrogen increase, etc., achieve high purity, high comprehensive efficiency, and reduce the cost of manufacturing processes Effect

Active Publication Date: 2021-05-28
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. If the physical heating method is used, the heating time will be longer. Take the LF furnace electrode heating as an example. Due to the long-term heating, the damage to the refractory material of the ladle will be aggravated.
[0004] 2. If the method of chemical heating is adopted, taking aluminum and oxygen blowing as an example, there will be a large amount of aluminum oxide inclusions in the molten steel, which is not good for the cleanliness of the molten steel
[0008] The two methods in the above patent documents can both increase the manganese content in steel, but there are two problems: one is to use raw materials such as electrolytic manganese, and the cost is relatively high
Second, when manganese is alloyed, desulfurization of molten steel and purification of molten steel cannot be taken into account

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] In this embodiment, manganese addition and desulfurization are realized in the process of smelting ZGMn13-4 steel in an electric arc furnace.

[0061] The amount of molten steel is 100 tons.

[0062] In the standard chemical composition of ZGMn13-4 steel, the contents of carbon, manganese and sulfur are: [C]: 0.90% ~ 1.3%; [Mn]: 11.0% ~ 14.0%, [S] ≤ 0.04%.

[0063] The main chemical components of manganese ore powder are: [MnO]: 75.38%, [SiO 2 ]: 3.11%, [FeO]: 16.77%. Manganese content=75.38%×55 / (55+16)=58.39%.

[0064] The specific process is as follows:

[0065] 1. Calculate the amount of mixed powder according to the amount of molten steel and the manganese composition requirements of high manganese steel;

[0066] Calculation process: 100 tons of ZGMn13-4 liquid steel needs manganese element quality Q Mn =100×12.5%=12.5 tons (12.5% ​​is the middle value of 11.0%~14.0%); Reducing 12.5 tons of manganese from manganese ore powder requires the quality of manganese ...

Embodiment 2

[0076] In this embodiment, manganese addition and desulfurization are realized in the process of smelting ZGMn13-1 steel in an electric arc furnace.

[0077] The amount of molten steel is 70 tons.

[0078] In the standard chemical composition of ZGMn13-1 steel, the contents of carbon, manganese and sulfur are: [C]: 1.0% ~ 1.45%; [Mn]: 11.0% ~ 14.0%, [S] ≤ 0.04%.

[0079] The main chemical components of manganese ore powder are: [MnO]: 70.05%, [SiO 2 ]: 3.41%, [FeO]: 15.56%, manganese content=70.05%×55 / (55+16)=54.26%.

[0080] The specific process is as follows:

[0081] 1. Calculate the amount of mixed powder according to the amount of molten steel and the manganese composition requirements of high manganese steel;

[0082] Calculation process: 70 tons of ZGMn13-1 liquid steel needs manganese element quality Q Mn =70×12.5%=8.75 tons (12.5% ​​is the median value of 11.0%~14.0%); to reduce 8.75 tons of manganese from manganese ore powder, the quality Q of manganese ore powde...

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Abstract

The invention relates to a method for increasing manganese and removing sulfur in the high manganese steel refining process. The method comprises the following steps that manganese mineral powder and aluminum powder are mixed to obtain mixed powder; in the high manganese steel smelting process, the mixed powder is added into molten slag, the manganese mineral powder and aluminum powder are subjected to an oxidation reaction through the high temperature of the molten slag, liquid metal manganese generated through the reaction directly settles to the molten steel surface and enters molten steel, and the manganese content in the molten steel is increased. And aluminum oxide is combined with calcium oxide in the molten slag to generate 12CaO. 7Al2O3. According to the method, the purposes of manganese increasing, desulfurization and molten steel purification can be achieved in the high manganese steel smelting process.

Description

technical field [0001] The invention relates to the technical field of high manganese steel smelting, in particular to a method for increasing manganese in the high manganese steel smelting process. Background technique [0002] In the smelting process of manganese-containing steel, manganese is generally added to the smelting furnace in the form of manganese-ferroalloy or metal manganese, electrolytic manganese, etc.; for steel types with low manganese content, the molten steel can be heated chemically or physically Make up for the temperature loss caused by the manganese alloying process. However, for steel types with high manganese content (>10%), simply adopting the method of heating molten steel will bring two disadvantages: [0003] 1. If the physical heating method is used, the heating time will be longer. Take the LF furnace electrode heating as an example. Due to the long-term heating, the damage to the refractory material of the ladle will be aggravated. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/064C21C7/076
CPCC21C7/0006C21C7/0037C21C7/064C21C7/076Y02P10/20
Inventor 黄玉平廖相巍赵成林张晓光李德军栗红陈东张维维赵亮康磊
Owner ANGANG STEEL CO LTD