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Deoxidation and restoration method for smelting stainless steel in converter

A converter smelting, stainless steel technology, applied in the direction of manufacturing converters, etc., can solve the problems of increasing stainless steel manufacturing costs and high prices of ferrosilicon

Active Publication Date: 2011-04-27
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicon carbide has a strong reducing ability, and the price of ferrosilicon is relatively high, which correspondingly increases the manufacturing cost of stainless steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Raw materials: dephosphorized hot metal, high-carbon ferrochrome, steelmaking lime, lightly burned dolomite, fluorite blocks, 80 silicon carbide, high-carbon ferromanganese, high-pressure oxygen, nitrogen

[0031] Reaction vessel: 80 tons of KOBMS converter

[0032] Smelting products: 430 stainless steel molten steel

[0033] The weight percent of 80 silicon carbide components is:

[0034] SiC 82%; Free C 5.8%; S 0.05;

[0035] SiO 9%; Moisture 0.4%; Ignition loss 2.75%.

[0036] The carbon, silicon and phosphorus components (percentage by weight) in the dephosphorized hot metal are:

[0037] C 3.6%; Si 0.08%; P 0.020%;

[0038] Requirements for C, Si, Mn and Cr (weight percent) in KOBMS converter tapping 430:

[0039] C 0.20-0.40; Si 0.15-0.30; Mn 0.10-0.25; Cr 15.90-16.30.

[0040] This embodiment is:

[0041] C 0.30%; Si 0.20%; Mn 0.18%; Cr 16.10%.

[0042] The deoxidation reduction method embodiment of this converter smelting stainless steel is the following...

Embodiment 2

[0048] Raw materials: dephosphorized hot metal, high-carbon ferrochrome, steelmaking lime, lightly burned dolomite, fluorite blocks, 80 silicon carbide, high-carbon ferromanganese, high-pressure oxygen, nitrogen

[0049] Reaction vessel: 80 tons of KOBMS converter

[0050] Smelting products: 409L stainless steel molten steel

[0051] The weight percent of 80 silicon carbide components is:

[0052] SiC 82%; Free C 5.8%; S 0.05; SiO 9%; Moisture 0.4%;

[0053] Fire reduction of 2.75%.

[0054] The carbon, silicon and phosphorus components (percentage by weight) in the dephosphorized hot metal are:

[0055] C 3.8%; Si 0.08%; P 0.016%;

[0056] Requirements for C, Si, Mn and Cr (weight percent) in KOBMS converter tapping 409L:

[0057] C 0.20-0.40; Si 0.15-0.30; Mn 0.10-0.25; Cr 12.10-12.50.

[0058] This embodiment is:

[0059] C 0.32; Si 0.20; Mn 0.20; Cr 12.30.

[0060] The deoxidation reduction method embodiment of this converter smelting stainless steel is the followi...

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PUM

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Abstract

The invention relates to a deoxidation and restoration method for smelting stainless steel in a converter. The method comprises the following steps of: (1) smelting stainless steel in a converter: blending dephosphorized molten iron in the converter, blowing in high-pressure oxygen and nitrogen in a flow ratio of 1 to (2.53-3.5) for decarburization and temperature rise, adding high-carbon chromium iron, high-carbon ferromanganese iron, steelmaking lime and caustic-burned dolomite to the converter in batch from a storage bin at the top of the converter, wherein the dephosphorized molten iron contains the following components in percentage by weight: 3.0-4.0 percent of C, not more than 0.1 percent of Si and not more than 0.025 percent of P, the molten iron contains 0.20-0.40 percent of carbon, and the contents of chromium and nickel reach a control range of a corresponding steel grade; and (2) restoring: calculating the amount of needed pure silicon to be added, converting into the amount of silicon carbide, adding fluorite, flushing nitrogen, stirring and restoring so that the amount of Cr2O3 in the converter is not more than 0.5 percent. The eoxidation and restoration method for smelting stainless steel in the converter can decrease the costs of the raw materials.

Description

technical field [0001] The invention relates to a deoxidation reduction method for smelting stainless steel in a converter. Background technique [0002] In the production of stainless steel by KOBMS converter, a certain amount of reducing agent needs to be added after the reduction period begins to reduce the metal oxides entering the slag during the oxygen blowing smelting period. The deoxidation reduction method of converter smelting stainless steel is to use ferrosilicon or ferrosilicon plus aluminum as reducing agent. Silicon carbide has a strong reducing ability, and the price of ferrosilicon is relatively high, which correspondingly increases the manufacturing cost of stainless steel. Contents of the invention [0003] In order to overcome the above-mentioned shortcomings of the existing deoxidation-reduction method for smelting stainless steel with a converter, the present invention provides a deoxidation-reduction method for smelting stainless steel with a lower ...

Claims

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Application Information

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IPC IPC(8): C21C5/35
Inventor 刘卫东侯海滨
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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