Method for smelting stainless steel by top and bottom combined blown converter

A top-bottom combined blowing and converter smelting technology, which is applied in the field of top-bottom combined blowing converter smelting stainless steel, can solve the problems of inflexible process, high production cost, and complicated stainless steel production process in top-bottom combined blowing converter

Active Publication Date: 2009-09-09
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] It is an important metallurgical method to smelt stainless steel with the top-bottom combined blowing converter, but due to the insufficient heat provided in the top-bottom combined blowing converter, it must be combined with the supplementary heat of the electric furnace or other melting equipment to produce stainless steel, which causes the top-bottom combined blowing The stainless steel production process of the converter is complex; the process is not flexible; the production cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Smelted stainless steel: 0Cr18Ni9

[0039] The requirements for smelting raw materials and smelting furnaces are as follows:

[0040] Top-bottom combined blown converter is adopted, the volume of the furnace is 75t, and the maximum flow rate of top-blown oxygen is 200m 3 / min; the maximum flow rate of bottom blowing gas is 60m 3 / min.

[0041] The steps of this embodiment are as follows:

[0042] Time Processing content

[0043] 10:27 55 tons of pretreated molten iron was mixed into the top-bottom combined blowing converter, and the temperature of the molten iron was 1345°C.

[0044] 10:29 Sampling and analysis of molten iron (10:35 analysis results), the molten iron contains:

[0045] C Si Mn P S

[0046] 4.05% 0.09% 0.05% 0.015% 0.03%

[0047] 10:29 Oxygen blowing at the top oxygen lance, oxygen blowing at the bottom of the furnace, nitrogen blowing smelting, top lance blowing gas and flow: O 2 =180m 3 / min; the height of the gun position is 2.1m; the bottom bl...

Embodiment 2

[0068] Smelted stainless steel: 0Cr18Ni9

[0069] The requirements for smelting raw materials and smelting furnaces are as follows:

[0070] Top-bottom combined blown converter is adopted, the volume of the furnace is 75t, and the maximum flow rate of top-blown oxygen is 200m 3 / min; the maximum flow rate of bottom blowing gas is 60m 3 / min.

[0071] The steps of this embodiment are as follows:

[0072] time processing content

[0073] 9:23 55 tons of pretreated molten iron was mixed into the top-bottom combined blowing converter, and the temperature of the molten iron was 1345°C.

[0074] 9:25 Sampling and analysis of molten iron (9:27 analysis results) contained in molten iron:

[0075] C Si Mn P S

[0076] 4.05% 0.01% 0.01% 0.013% 0.039%

[0077] 9:26 top-bottom compound blowing. Top gun blowing gas and flow: O 2 =180m 3 / min; the height of the gun position is 2.1m; the bottom blowing gas and the flow rate are O 2 :N 2 =15:25m 3 / min.

[0078] 9:26 Add 4988kg ...

Embodiment 3

[0097] Smelted stainless steel: 2Cr13

[0098] The requirements for smelting raw materials and smelting furnaces are as follows:

[0099] Top-bottom combined blown converter is adopted, the volume of the furnace is 75t, and the maximum flow rate of top-blown oxygen is 200m 3 / min; the maximum flow rate of bottom blowing gas is 60m 3 / min.

[0100] The steps of this embodiment are as follows:

[0101] Time Processing content

[0102] 11:55 64.5 tons of pretreated molten iron was mixed into the top-bottom combined blowing converter, and the temperature of the molten iron was 1200°C.

[0103] 11:56 Sampling and analysis of molten iron (analysis results at 12:00) contained in molten iron:

[0104] C Si Mn P S

[0105] 4.2% 0.01% 0.01% 0.014% 0.02%

[0106] 11:56 Add 2325kg of coke particles.

[0107] 11:56 Top-to-bottom compound blowing. Top gun blowing gas and flow: O 2 =180m 3 / min; the height of the gun position is 2.1m; the bottom blowing gas and the flow rate are O...

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Abstract

A method for smelting stainless steel in a top-bottom combined blowing converter, which comprises the following steps in sequence: I blending molten iron into the top and bottom combined blowing converter and adding coke, blowing oxygen and argon for smelting; II when the temperature of the molten steel is greater than 1600°C, Add ferromanganese and ferrochrome alloy with oxygen and argon for smelting, add slag material to adjust slag; when the temperature of molten steel III is higher than 1630°C, add ferromanganese and ferrochrome alloy again, blow oxygen and argon to smelt, add slag material to adjust slag ; IV When the actual measured temperature of the molten steel is greater than the calculated temperature, add the remaining alloy ferromanganese, ferrochromium, nickel, blow oxygen and argon for smelting, add lime and a small amount of fluorite to adjust the slag; V gradually reduces the amount of oxygen blowing and gradually increases the blowing Argon volume; VI stops oxygen blowing at the bottom of the furnace, only blows argon and stirs for 1.5-2.5 minutes; VII adds ferrosilicon and slag; VIII reduces bottom blowing argon and stirs for ≥ 5 minutes; IX takes samples to analyze components and tap out. The method for smelting stainless steel in a top-bottom combined blowing converter has low cost.

Description

technical field [0001] The invention relates to a method for smelting stainless steel in a top-bottom combined blowing converter, specifically a metallurgical method for directly smelting stainless steel or providing crude stainless steel water for VOD by using molten iron and alloys as main raw materials in a top-bottom combined blowing converter. Background technique [0002] It is an important metallurgical method to smelt stainless steel with the top-bottom combined blowing converter, but due to the insufficient heat provided in the top-bottom combined blowing converter, it must be combined with the supplementary heat of the electric furnace or other melting equipment to produce stainless steel, which causes the top-bottom combined blowing The process of producing stainless steel by converter is complicated; the process is not flexible; and the production cost is high. Contents of the invention [0003] In order to overcome the above-mentioned shortcomings of the curre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C21C7/00
Inventor 刘承志李志斌郝建峰
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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