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 complex stainless steel production process, high production cost and inflexible process of top-bottom combined blowing converter

Active Publication Date: 2008-03-12
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 b...

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-to-bottom compound blowing. Top gun blowing gas and flow: O 2 =180m 3 / min; gun position

[0078] Height 2.1m; bottom blowing gas and flow rate is O 2 :N 2 =15:25m 3 / min.

[0079] 9:26 Add 4988kg of high ca...

Embodiment 3

[0098] Smelted stainless steel: 2Cr13

[0099] The requirements for smelting raw materials and smelting furnaces are as follows:

[0100] 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.

[0101] The steps of this embodiment are as follows:

[0102] Time Processing content

[0103] 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.

[0104] 11:56 Sampling and analysis of molten iron (analysis results at 12:00) contained in molten iron:

[0105] C Si Mn P S

[0106] 4.2% 0.01% 0.01% 0.014% 0.02%

[0107] 11:56 Add 2325kg of coke particles.

[0108] 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

The invention provides a method for smelting stainless steel by a top-bottom blowing converter, which comprises the following procedures: I. adding ion melt into the top-bottom blowing converter, adding coke, blowing oxygen and argon to smelt; II. when the molten steel temperature is more than 1600 DEG C, adding ferromanganese iron, chromium iron alloy, blowing oxygen and argon to smelt, adding slag to adjust the slag; III. when the molten steel temperature is more than 1630 DEG C, adding again ferromanganese iron, chromium iron alloy, blowing oxygen and argon to smelt, adding slag to adjust the slag; IV. when the actually measured temperature of the molten steel is more than the calculated temperature, adding the remainder alloy ferromanganese iron, chromium iron and nickel, blowing oxygen and argon to smelt, adding lime and small amount of fluorspar to adjust the slag; V. reducing gradually the blown oxygen and increasing the blown argon; VI. stopping blowing oxygen from bottom but only blowing argon, agitating 1.5-2.5 min.; VII. adding silicon iron and adding slag; VIII. blowing argon from bottom for reducing and agitating for >=5 min.; IX. sampling and analyzing components, and tapping steel. The present method for smelting stainless steel by a top-bottom blowing converter is of 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 Applications(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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