Deoxidation method for converter tapping molten steel

A molten steel and converter technology, applied in the manufacture of converters, etc., can solve the problems of poor deoxidation effect of deoxidizer, high cost, low yield of alloy elements, etc., to reduce oxidation erosion, reduce deoxidation cost, and reduce slag oxidation Effect

Inactive Publication Date: 2012-08-15
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for deoxidizing molten steel in converter tapping, which overcomes the problems of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Carbon structural steel Q235B, smelting process route: molten iron KR method desulfurization-converter-ladle bottom blowing argon refining-continuous casting.

[0024] The steel output of the converter is 80t, the carbon content at the end of converter blowing is 0.052%, the oxygen content of molten steel is 583ppm, and the steel tapping temperature is 1688°C. When the converter is about to tap steel, 3.5kg of carbon powder with a diameter of 5mm, 70kg of carbon powder with a diameter of 20mm SiC and 65kg of CaC with a diameter of 20mm 2 Add to ladle. The converter adopts slag blocking ball for tapping and the tapping temperature is 1660°C. Bottom blowing of argon gas is started at the beginning of tapping, and the intensity of argon bottom blowing during tapping is 0.125m 3 / (t.h), when the quality of the tapping molten steel accounted for about 35% of the total, 40kg of silicon-aluminum-barium-calcium alloy was added for deep deoxidation. Then add 450kg of high-carb...

Embodiment 2

[0027] Structural steel Q370qE for bridges, smelting process route: hot metal desulfurization by KR method - converter - ladle bottom blowing argon refining - RH refining - continuous casting.

[0028] The steel output of the converter is 80t, the carbon content at the end of converter blowing is 0.063%, and the oxygen content of molten steel is 464ppm. CaC with a diameter of 20 mm 2 Put it into the ladle, the converter adopts slag stopper to tap steel and the tapping temperature is 1700°C, the bottom blowing of argon gas starts at the beginning of tapping, and the intensity of argon bottom blowing during the tapping process is 0.200m 3 / (t.h), when the quality of the tapping molten steel accounts for about 35% of the total, 200kg of silicon-aluminum-barium-calcium alloy is added for deep deoxidation, and then 480kg of high-carbon ferromanganese, 960kg of medium-carbon ferromanganese and 220kg of ferrosilicon are added , the converter adopts the slag blocking method to block ...

Embodiment 3

[0031] Rebar HRB335, smelting process route: molten iron KR method desulfurization - converter - ladle bottom blowing argon refining - continuous casting.

[0032] The steel output of the converter is 80t, the carbon content at the end of converter blowing is 0.058%, and the oxygen content of molten steel is 523ppm. When the converter is about to tap steel, 10kg of carbon powder with a diameter of 7mm, 80kg of SiC with a diameter of 15mm CaC 2 Put it into the ladle, the converter adopts slag stopper to tap steel and the tapping temperature is 1680°C, and the bottom blowing of argon gas is started at the beginning of tapping, and the intensity of argon bottom blowing during the tapping process is 0.375m 3 / (t.h), when the quality of the tapping molten steel accounts for about 35% of the total, 100kg of silicon-aluminum-barium-calcium alloy is added for deep deoxidation, then 500kg of high-carbon ferromanganese and 130kg of ferrosilicon are added, and finally the converter adopt...

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Abstract

The invention discloses a deoxidation method for converter tapping molten steel. The deoxidation method comprises the steps of: firstly adding a deoxidizer into a ladle before the converter tapping, wherein the addition amount of the deoxidizer is 1.75-4.0kg per ton of tapping molten steel; then tapping at 1660-1700 DEG C and blowing argon to the bottom of ladle at the same time; adding a deep deoxidizer when the tapping molten steel accounts for 30%-40% of the total molten steel, and carrying out deep deoxidation, wherein the addition amount of the deep deoxidizer is 0.5-2.5kg per ton of tapping molten steel, and the addition of the deep deoxidizer is finished before that the tapping molten steel accounts for 75% of the total molten steel. The deoxidation method disclosed by the invention has the advantages that the pre-deoxidation is finished by mainly adopting relatively cheap deoxidizer such as carbon powder, SiC and CaC2 and final deoxidation is finished by cooperating with the deep deoxidizer; and the deoxidizer can effectively reduce the oxidation property of the slag on the surface of the molten steel, is beneficial to reducing the oxidation loss of alloying element and reducing the oxidation erosion of the slag to the refractory, and significantly improves the yield of the alloying element.

Description

technical field [0001] The invention belongs to the converter steelmaking technology in the metallurgical industry, in particular to a converter tapping molten steel deoxidation method. technical background [0002] In the oxygen converter steelmaking process, in order to remove the dissolved oxygen in the steel, it is necessary to use a deoxidizer to deoxidize the molten steel. Usually, the main method of deoxidation is to add deoxidizers containing Si, Mn, and Al elements to the molten steel to combine with dissolved oxygen in the steel to form oxides, and then separate the formed oxides from the molten steel by various methods ,exclude. This traditional way of deoxidizing molten steel often needs to consume a large amount of Al, which is costly and will inevitably lead to the deoxidization of Al in steel. 2 o 3 The amount is relatively large and difficult to fully remove. Moreover, the traditional method of molten steel deoxidation mainly focuses on the removal of dis...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C5/28
Inventor 王奇福宋泽啟魏伟陈国威张洪钢黄成红王安军庞建飞王羽商勇
Owner WUHAN IRON & STEEL (GROUP) CORP
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