Method for smelting stainless steel oxidizing slag by using argon oxygen furnace

A technology of stainless steel and oxide slag, which is applied in the field of stainless steel smelting to achieve the effect of increasing decarburization speed, reducing consumption and cost, and prolonging the life of furnace lining

Active Publication Date: 2008-06-04
BAOSTEEL DESHENG STAINLESS STEEL
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Problems solved by technology

[0031] However, since AOD converters for smelting stainless steel are usually lined with magnesia dolomite, Al in slag 2 o 3 It will also react with CaO in the furnace lining, so the corrosion effect on the furnace lining is very serious, so aluminum slag (Al 2 o 3 ) slag

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  • Method for smelting stainless steel oxidizing slag by using argon oxygen furnace

Examples

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Embodiment Construction

[0055] Examples see Table 2.

[0056] It can be seen from Table 2 that,

[0057] 1) When manganese-poor mineralized slag is used, both lime and lightly burned dolomite can be used as slagging materials.

[0058] 2) The amount of poor manganese ore accounts for 5.0-50.0% of the total amount of other slag materials (see Examples 1 and 5).

[0059] 3) The temperature of stainless steel mother liquor should be controlled at 1530°C-1720°C.

[0060] It should be pointed out that the blowing gas (Ar, O 2 ) in the same amount as in conventional smelting.

[0061] Table 2 The main parameters of the manganese-poor mineralization slag embodiment and comparative examples

[0062]

[0063] As can be seen from Table 2, compared with Comparative Examples 1 and 2, the embodiment adds other slagging materials (i.e. lime and dolomite) total amount of 5-50% poor manganese ore in the oxidation period of AOD converter smelting stainless steel, which can be produced in the furnace. Under th...

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Abstract

The invention discloses a slag melting method for Argon-Oxygen furnace smelting stainless steel oxidized dross, comprising the procedures that, 1) mass percentage chemical compositions of the crude stainless steel liquid are; 1.5 to 3.5 percent of C, 0 to 0.40 percent of Si, 0 to 0.40 percent of Mn, 8.0 to 30.0 percent of Cr, 0 to 20.0 percent of Ni, no more than 0.03 percent of S, no more than 0.04 percent of P, the balance Fe and incidental impurities; 2) oxidation phase, 3) reduction phase, 4) refining phase. The 2) Oxidation phase is that: lime is added before charging crude stainless steel liquid into Argon-Oxygen furnace to increase the degree of basicity of initial dross. The temperature of steel liquid increases gradually as blowing refinement processes; lime and low-grade manganese ore are added in batches to form complete liquid dross. The 3) reduction phase is that: silicon iron is added to reduce steel liquid and slag, during which only argon gas is used for blowing refinement. The 4) refining phase is that: components are adjusted to target components, during which argon or nitrogen gas is used for blowing refinement. The invention has good slag melting effect during oxidation phase with the Argon-Oxygen furnace, increases decarburization speed, decreases smelting period, thereby improving manufacture efficiency, extending the service life of furnace lining and reducing consumption and cost.

Description

technical field [0001] The invention belongs to the field of stainless steel smelting, in particular to a process for smelting stainless steel in an argon oxygen furnace (AOD furnace) and a method for reducing oxidized slag. Background technique [0002] The argon oxygen furnace (AOD furnace) converter is the main equipment for smelting stainless steel. According to incomplete statistics, the stainless steel smelted by the AOD converter accounts for about 70% of the total output of stainless steel in the world. The whole process of smelting stainless steel with AOD converter can be roughly divided into oxidation period, reduction period and refining period. The time used in the oxidation period accounts for about 60-70% of the smelting cycle of a furnace of steel. [0003] The purpose of the oxidation period is to achieve "decarburization and chromium preservation" of molten steel under atmospheric conditions, that is, to oxidize and remove [C] in molten steel under the pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/18C22C38/40C21C7/04
Inventor 郑宏光陆斌左开山常锷杨华
Owner BAOSTEEL DESHENG STAINLESS STEEL
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