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Method for smelting high-manganese stainless steel through AOD and AOD furnace

A technology of stainless steel and high manganese, applied in the field of AOD smelting high manganese stainless steel and AOD furnace, can solve the problems of lowering AOD refining temperature, reducing AOD furnace age, and large amount of alloy addition, so as to reduce the carbon content at the end point and shorten the oxygen blowing time , the effect of reducing the burning loss of chromium

Active Publication Date: 2017-10-13
YONGXING SPECIAL STAINLESS STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The actual situation is that this method is only applicable when the manganese content is not high. When the manganese content exceeds 15%, the alloy addition amount in a single furnace is too large, which will greatly reduce the AOD refining temperature. Al-Si oxidizes and heats up, and it needs to be reduced again. During the heating process, a large amount of manganese will volatilize, increase the amount of manganese, and reduce the recovery rate. At the same time, due to the large amount added, the refining temperature of AOD before reduction will exceed 1800 ° C, exceeding AOD The refractory temperature of the furnace lining refractory material is 1750°C, which reduces the furnace life of AOD

Method used

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  • Method for smelting high-manganese stainless steel through AOD and AOD furnace
  • Method for smelting high-manganese stainless steel through AOD and AOD furnace
  • Method for smelting high-manganese stainless steel through AOD and AOD furnace

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Embodiment 1

[0049] Embodiment 1: The stainless steel grade smelted in this embodiment is 1Cr22Mn15N.

[0050] The composition of finished steel products is shown in Table 1. (mass fraction, %)

[0051]

[0052] One or more of high-carbon ferrochrome, waste stainless steel, waste ordinary carbon steel, and car scraps are used as raw materials to melt and heat up in an EAF furnace to form molten steel, add 5kg / t of silicon carbide for reduction, add 1.2 tons of lime and Carry out slagging, remove harmful slag, and make the mass fraction of Cr in molten steel higher than 24.0%. When the temperature reaches 1640°C, the molten steel is taken out of the furnace and blended into the AOD furnace.

[0053] The composition of EAF furnace mixed with steel is shown in Table 2. (mass fraction, %)

[0054]

[0055] The mass of molten steel after AOD mixing with steel is 19.2 tons, the temperature is kept above 1580°C, 2.3 tons of lime is added, and then oxygen is blown for decarburization;

...

Embodiment 2

[0064] The stainless steel grade smelted in this embodiment is Jk2LB.

[0065] The composition of finished steel products is shown in Table 4. (mass fraction, %)

[0066]

[0067] One or more of high-carbon ferrochrome, waste stainless steel, waste ordinary carbon steel, and car scraps are used as raw materials to melt and heat up in an EAF furnace to form molten steel, add 6kg / t of silicon carbide for reduction, add 1.2 tons of lime and Carry out slagging, remove harmful slag materials, discharge harmful gases, and make the mass fraction of Cr in molten steel higher than 14.0%. When the temperature reaches 1640°C, the molten steel is taken out and blended into the AOD furnace.

[0068] The composition of EAF furnace mixed with steel is shown in Table 5. (mass fraction, %)

[0069]

[0070] The mass of molten steel after AOD mixing with steel is 19.2 tons, the temperature is kept above 1580°C, 2.3 tons of lime is added, and then oxygen is blown for decarburization;

...

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Abstract

The invention discloses a method for smelting high-manganese stainless steel through AOD. The method comprises a preparatory process, a decarburization process, a prereduction process and a reduction process, wherein in the prereduction process, a ferrosilicon alloy serves as a deoxidizing agent and an alloying agent for deoxidization, manganese is added in a concentrated manner for manganese alloying, manganese is added in a batched manner in the manganese alloying process, heating is conducted while manganese is added, and meanwhile various technological parameters are reasonably controlled. According to the method for smelting the high-manganese stainless steel through AOD, for AOD smelting on the high-manganese stainless steel with the manganese content larger than 15%, the manganese alloying technology is improved, furnace temperature, an oxygen blowing parameter and the using dosage and time of the deoxidizing agent and the alloying agent are reasonably controlled, oxidization or burning loss of manganese are greatly reduced, and not only is the recycling rate of manganese increased, but also the loss, caused by high temperature, of an AOD furnace lining is reduced. The invention further discloses an AOD furnace. Installing of a bottom air blowing tube can be convenient to achieve, pouring of the AOD furnace is uniform and adjustable, slag flowing is uniform and capable of saving labor, the workload is reduced, the slag flowing speed is increased, the slag flowing quality is improved, and the manganese alloying process is accelerated.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular to the field of smelting stainless steel, in particular to an AOD method for smelting high-manganese stainless steel and an AOD furnace. Background technique [0002] In general stainless steel, the manganese content does not exceed 2.0%, such as 304, 316L, 310, etc., while the manganese content of stainless steel containing manganese will be 4-10%, such as chromium-manganese stainless steel such as 201, 202, and S20910. In recent years, a new type of high manganese stainless steel has been developed. The increase of manganese will greatly increase the solubility of nitrogen in the steel, and it is also an austenite forming element. The highest manganese has reached more than 22%. [0003] The Chinese invention patent application with the application announcement number CN 105039648 A discloses a method for smelting low-carbon and high-manganese content molten steel with an argon-oxygen de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06C21C7/068C21C7/06C22C38/58C22C38/02C22C38/42
CPCC21C5/005C21C7/0006C21C7/06C21C7/068C22C33/06C22C38/001C22C38/02C22C38/42C22C38/58Y02P10/20
Inventor 陈根保杨雪澜吉建军吴明华俞国红金卫强唐明琦莫琪芬王建勇
Owner YONGXING SPECIAL STAINLESS STEEL
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