CN102146501A - Refining method for producing stainless steel by VOD (vacuum oxygen decarburization) blowing CO2 - Google Patents
Refining method for producing stainless steel by VOD (vacuum oxygen decarburization) blowing CO2 Download PDFInfo
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- CN102146501A CN102146501A CN2010101081794A CN201010108179A CN102146501A CN 102146501 A CN102146501 A CN 102146501A CN 2010101081794 A CN2010101081794 A CN 2010101081794A CN 201010108179 A CN201010108179 A CN 201010108179A CN 102146501 A CN102146501 A CN 102146501A
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Abstract
The invention discloses a refining method for producing stainless steel by vacuum oxygen decarburization (VOD) blowing CO2. The method is characterized in that CO2 gas is blown into molten steel in a VOD refining process. The method comprises that: the bottom blowing gas is CO2 after the smelted primary molten steel is carried into a VOD, the blowing strength is 0.1 to 0.5Nm<3>/min.t, and then the pure oxygen is blown by adopting a top oxygen lance till the carbon content is less than 0.5 percent, wherein the blowing strength of the O2 is 2.5 to 3.0Nm<3>/min.t; the pure oxygen is blown by adopting the top oxygen lance, wherein the blowing strength of the O2 is 2.0 to 2.3Nm<3>/min.t; when the carbon content is less than 0.1 percent, the mixed gas of the O2 and the CO2 is blown by adopting the top oxygen lance, wherein the blowing strength of the O2 is 2.0 to 2.3Nm<3>/min.t, and the blowing strength of the CO2 is 1.8 to 2.0Nm<3>/min.t; and when the carbon content reaches a target lower limit, silicon-iron alloy is added to perform reduction and alloying treatment, and the top oxygen lance stops working till steel is tapped, wherein the bottom blowing gas is Ar, and the blowing strength of the Ar is 0.1 to 0.5Nm<3>/min.t. The problems of high dissolved oxygen content of refining end point molten steel and high oxidation in slag are solved, the consumption of alloy is reduced at the same time, and the method has remarkable economic benefit and social benefit by using the CO2 for decarburization.
Description
Technical field
The invention belongs to the external refining field of ferrous metallurgy technology, particularly a kind of VOD winding-up CO
2Produce the method for refining of soft steel.
Background technology
The VOD refining unit is to produce one of stainless major equipment, and the purified ultimate principle is carried out oxygen decarburization to molten steel under the condition that vacuumizes, be used for refining low-carbon (LC) or utmost point low carbon stainless steel.This technology is originally just at top oxygen blast gas, and the chromium oxidation is serious in the molten steel after carbon content is reduced to below 0.5%, causes later stage reduction alloy usage quantity to strengthen.Secondly owing to use oxygen to carry out decarburization, in the refining terminal point molten steel in the higher and slag of dissolved oxygen content oxidisability higher, cause the deoxygenated alloy usage quantity big, the cost height.
Summary of the invention
At above-mentioned problem, the invention provides a kind of VOD winding-up CO
2Produce stainless method of refining, adopt at VOD winding-up CO
2Molten steel is carried out carbonization treatment, temperature adjustment and cleaning action, solve in the refining terminal point molten steel the higher problem of oxidisability in the higher and slag of dissolved oxygen content, reduce the alloy usage quantity simultaneously, utilized CO
2Carry out decarburization, played positive effect, have remarkable economic efficiency and social benefit for alleviating atmospheric Greenhouse effect.
In order to achieve the above object, the present invention adopts following technical scheme:
A kind of VOD winding-up CO
2Produce the method for refining of soft steel, it is characterized in that the VOD refining process CO that in molten steel, jets
2, reach the decarburization of hypoxemia position, save deoxygenated alloy, reduce slag oxidation.Specific as follows:
1, after the first molten steel of smelting was moved into VOD, bottom blown gas was CO
2, spraying into intensity is 0.1Nm
3/ mint～0.5Nm
3/ mint, pressure are 0.5～1.0MPa, and first molten steel is moved into temperature requirement greater than 1600 ℃; Adopt purity oxygen to blow O by top oxygen rifle then
2Spraying into intensity is 2.5Nm
3/ mint～3.0Nm
3/ mint, pressure is 0.95～1.05MPa, until carbon content less than 0.5%.
2, when carbon content of molten steel less than 0.5%, top oxygen rifle adopts purity oxygen to blow O
2Spraying into intensity is 2.0Nm
3/ mint～2.3Nm
3/ mint, pressure are 0.95～1.05MPa.
3, when carbon content of molten steel less than 0.1%, top oxygen rifle adopts oxygen and CO
2Mixed gas blows, O
2Spraying into intensity is 2.0Nm
3/ mint～2.3Nm
3/ mint, pressure are 0.95～1.05MPa; CO
2Spraying into intensity is 1.8Nm
3/ mint～2.0Nm
3/ mint, pressure are 0.95～1.05MPa.
4, reach the target lower limit when carbon content of molten steel, add ferro-silicon and reduce and Alloying Treatment, top oxygen rifle quits work, and bottom blown gas is Ar, and spraying into intensity is 0.1Nm
3/ mint～0.5Nm
3/ mint, pressure are 0.5～1.0MPa.Until tapping.
Further, blowing gas concentration requirement: O
2Greater than 99.5%, CO
2Greater than 99.3%, Ar is greater than 99.8%.
A kind of VOD set forth in the present invention adopts winding-up CO
2Produce the method for refining of soft steel, adopt at VOD winding-up CO
2Molten steel is carried out carbonization treatment, temperature adjustment and cleaning action, strengthened molten steel decarburization function, solve in the refining terminal point molten steel the higher problem of oxidisability in the higher and slag of dissolved oxygen content, reduce the alloy usage quantity simultaneously, utilized CO
2Carry out decarburization, suitable smelting carbon content is 0.001%～0.3% steel grade.This technology investment is little, and production cost is low, is fit to economy, produces stainless steel efficiently, on a large scale, has good popularizing application prospect.Simultaneously, this technology reduces the alloy usage quantity, has utilized CO
2Carry out decarburization, played positive effect, have remarkable economic efficiency and social benefit for alleviating atmospheric Greenhouse effect.
Embodiment
For reaching best implementation result, take following embodiment to see Table 1, in embodiments, bottom blown gas pressure is 0.6MPa, top-blown gas pressure is 1.0MPa.Blowing gas concentration: O
2Be 99.6%, CO
2Be 99.4%, Ar is 99.9%.
Table 1 specific embodiment of the invention and effect
Adopt above-mentioned embodiment, by Comparative Examples as can be seen, under molten steel starting condition and the essentially identical situation of air supply intensity, final carbon content basically identical, temperature is basically identical also, but the a[o of molten steel] reduce by 24%, slag oxidation reduction by 11.5%.
Claims (5)
1. VOD winding-up CO
2Produce stainless method of refining, it is characterized in that: the VOD refining process CO that in molten steel, jets
2
2. a kind of VOD winding-up CO according to claim 1
2Produce stainless method of refining, it is characterized in that:
1) after the first molten steel of smelting was moved into VOD, bottom blown gas was CO
2, spraying into intensity is 0.1Nm
3/ mint～0.5Nm
3/ mint adopts purity oxygen to blow O by top oxygen rifle then
2Spraying into intensity is 2.5Nm
3/ mint～3.0Nm
3/ mint, until carbon content less than 0.5%;
2) when carbon content of molten steel less than 0.5%, top oxygen rifle adopts purity oxygen to blow O
2Spraying into intensity is 2.0Nm
3/ mint～2.3Nm
3/ mint;
3) when carbon content of molten steel less than 0.1%, top oxygen rifle adopts oxygen and CO
2Mixed gas blows, O
2Spraying into intensity is 2.0Nm
3/ mint～2.3Nm
3/ mint; CO
2Spraying into intensity is 1.8Nm
3/ mint～2.0Nm
3/ mint;
4) reach the target lower limit when carbon content of molten steel, add ferro-silicon and reduce and Alloying Treatment, top oxygen rifle quits work, and bottom blown gas is Ar, and spraying into intensity is 0.1Nm
3/ mint～0.5Nm
3/ mint is until tapping.
3. a kind of VOD winding-up CO according to claim 2
2Produce stainless method of refining, it is characterized in that: first molten steel is moved into temperature greater than 1600 ℃.
4. a kind of VOD winding-up CO according to claim 2
2Produce stainless method of refining, it is characterized in that: bottom blown gas pressure is 0.5～1.0MPa, and top-blown gas pressure is 0.95～1.05MPa.
5. a kind of VOD winding-up CO according to claim 2
2Produce stainless method of refining, it is characterized in that: blowing gas concentration requirement O
2Greater than 99.5%, CO
2Greater than 99.3%, Ar is greater than 99.8%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010108179 CN102146501B (en) | 2010-02-05 | 2010-02-05 | Refining method for producing stainless steel by VOD (vacuum oxygen decarburization) blowing CO2 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010108179 CN102146501B (en) | 2010-02-05 | 2010-02-05 | Refining method for producing stainless steel by VOD (vacuum oxygen decarburization) blowing CO2 |
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| Publication Number | Publication Date |
|---|---|
| CN102146501A true CN102146501A (en) | 2011-08-10 |
| CN102146501B CN102146501B (en) | 2013-07-03 |
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|---|---|---|---|
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106636559A (en) * | 2017-02-14 | 2017-05-10 | 北京科技大学 | Steel smelting device capable of circularly spraying and blowing CO2 and CO-Ar in exhaust gas of VOD (Vacuum Oxygen Decarburization) furnace |
| CN106834608A (en) * | 2017-02-16 | 2017-06-13 | 山西太钢不锈钢股份有限公司 | A kind of AOD furnace CO2The method for substituting part argon gas smelting stainless steel |
| CN108588338A (en) * | 2018-03-20 | 2018-09-28 | 北京科技大学 | A kind of VD stoves utilize CO2The method for making steel denitrogenation |
| CN110093479A (en) * | 2019-03-28 | 2019-08-06 | 山西太钢不锈钢股份有限公司 | A kind of bottom blowing CO2The method of smelting stainless steel |
| CN112853030A (en) * | 2021-01-04 | 2021-05-28 | 北京科技大学 | TSR furnace top bottom combined blowing CO2Method for smelting stainless steel |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5190577A (en) * | 1990-12-11 | 1993-03-02 | Liquid Air Corporation | Replacement of argon with carbon dioxide in a reactor containing molten metal for the purpose of refining molten metal |
| BR9406712A (en) * | 1993-06-04 | 1996-03-19 | Nippon Steel Corp | Production method for low carbon cast steel using vacuum degassing and decarburization treatment |
-
2010
- 2010-02-05 CN CN 201010108179 patent/CN102146501B/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106636559A (en) * | 2017-02-14 | 2017-05-10 | 北京科技大学 | Steel smelting device capable of circularly spraying and blowing CO2 and CO-Ar in exhaust gas of VOD (Vacuum Oxygen Decarburization) furnace |
| CN106636559B (en) * | 2017-02-14 | 2018-09-14 | 北京科技大学 | The steel-smelting device of CO2, CO-Ar cycle injection in VOD furnace exhaust gas |
| CN106834608A (en) * | 2017-02-16 | 2017-06-13 | 山西太钢不锈钢股份有限公司 | A kind of AOD furnace CO2The method for substituting part argon gas smelting stainless steel |
| CN108588338A (en) * | 2018-03-20 | 2018-09-28 | 北京科技大学 | A kind of VD stoves utilize CO2The method for making steel denitrogenation |
| CN108588338B (en) * | 2018-03-20 | 2019-05-03 | 北京科技大学 | A kind of VD furnace utilizes CO2The method for making steel denitrogenation |
| CN110093479A (en) * | 2019-03-28 | 2019-08-06 | 山西太钢不锈钢股份有限公司 | A kind of bottom blowing CO2The method of smelting stainless steel |
| CN112853030A (en) * | 2021-01-04 | 2021-05-28 | 北京科技大学 | TSR furnace top bottom combined blowing CO2Method for smelting stainless steel |
| CN112853030B (en) * | 2021-01-04 | 2021-09-21 | 北京科技大学 | TSR furnace top bottom combined blowing CO2Method for smelting stainless steel |
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| Publication number | Publication date |
|---|---|
| CN102146501B (en) | 2013-07-03 |
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