CN102127615B - Method for smelting in reduction period of electric furnace steel making - Google Patents
Method for smelting in reduction period of electric furnace steel making Download PDFInfo
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- CN102127615B CN102127615B CN2011100320862A CN201110032086A CN102127615B CN 102127615 B CN102127615 B CN 102127615B CN 2011100320862 A CN2011100320862 A CN 2011100320862A CN 201110032086 A CN201110032086 A CN 201110032086A CN 102127615 B CN102127615 B CN 102127615B
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Abstract
The invention relates to a method for smelting in reduction period of electric furnace steel making, comprising the following steps of: I, melting scrap steel, namely adding full-scrap steel into an electric furnace and electrifying to melt the scrap steel, heating the scrap steel to 1590-1650 DEG C, wherein blast oxygen flow is 1300-1900Nm<3>/min, after the melting period of the electric furnace is finished, adding 2.5-3.5kg of FeSi per ton molten steel, and entering the reduction period; II, mixing while nitrogen is blown, namely closing an oxygen valve and opening a nitrogen valve, wherein the pressure is 0.4-0.6MPa, and blast nitrogen flow is 750-1050Nm<3>/min; when nitrogen blowing is started and the outlet of an oxygen lance is inserted 30-50mm below top of slag, and deeply blowing nitrogen after FeSi to be added is molten, wherein the insertion depth of the oxygen lance is 400-600mm, and the nitrogen pressure is 0.7-0.9Mpa, thus the mass percentage of components of the molten steel can reach the requirement by the blowing; and III, finishing nitrogen blowing, namely pulling the oxygen lance out of the top of the slag after the nitrogen blowing is finished, and closing a nitrogen switch and rotating a furnace door oxygen lance to leave a furnace door. The method for smelting in the reduction period of electric furnace steel making has the advantages that the composition of the molten steel is uniform and slag overflow in the tapping process is obviously reduced.
Description
Technical field
The present invention relates to the method that a kind of Electric furnace steel making reduction period is smelted.
Background technology
In the electric furnace link of stainless steel smelting, the dynamic conditions in the stove is the key factor of restriction electric furnace reduction time, reduction effect.The method that existing Electric furnace steel making reduction period is smelted is difficult to adjust in reduction period stove internal dynamics condition, will cause the inhomogeneous of stove interior temperature, composition up and down, makes reduction effect poor, Cr in the slag
2O
3Content is high, causes the noble metal loss serious, and goes out molten steel composition in the ladle, non-uniform temperature (applicant affiliated unit electric furnace divide two contract out steel).Because dissolved oxygen is more in reduction insufficient molten steel and the slag, cause in the tapping process in the molten steel and slag dissolved oxygen to generate the CO bubble and cause Boiling of Steel with the carbon reaction, the tapping time lengthening also can burn out equipment in the time of seriously, influences normally carrying out of production.Therefore, improve Electric furnace steel making reduction period dynamic conditions, most important to improving noble metal Cr yield.
Summary of the invention
In order to overcome the above-mentioned deficiency of the method that has the smelting of Electric furnace steel making reduction period now, the present invention provides a kind of chromium metal yield method that higher Electric furnace steel making reduction period is smelted.
Design of the present invention is to improve Electric furnace steel making reduction period dynamic conditions through gas stirring, and this is a method commonly used in producing, because stainless steel product requires to contain certain nitrogen content, adopts this economy of nitrogen and don't influences the gas of steel quality.Therefore; The present invention is connecting nitrogen pipeline and relevant by-pass valve control at electric furnace fire door oxygen rifle air-supply duct by Y-tube, on nitrogen pipeline, is connecting pressure valve, trip valve and variable valve (regulating valve) successively and is making it to possess the function that oxygen blast gas melts and nitrogen blowing stirs.
The method that this Electric furnace steel making reduction period is smelted comprises following sequential steps:
The I melting waste steel
The full steel scrap of following quality per distribution ratio is added in the electric furnace:
C:1.5～3.0 Si:0.5～1.3 Mn:0～0.4 Ni:6.5～8.5P:0.025～0.04 S:0～0.075 Cr:16.5～18.5Cu:0～0.1, all the other are Fe and unavoidable impurities.
Energising heating steel scrap all melts steel scrap, and molten steel is heated to 1590-1650 ℃, oxygen blast flow 1300-1900Nm3/ minute, and oxygen blast 20-35 minute, the furnace melting phase added FeSi after finishing, and add-on is that molten steel per ton adds 2.5-3.5kg, gets into reduction period.
The II nitrogen flushing is stirred
Close oxygen valve, open the nitrogen valve and begin nitrogen blowing and stir, regulate the nitrogen pressure setter, pressure is set at 0.4-0.6Mpa, and nitrogen flushing flow is 750-1050Nm
3/ minute, the nitrogen flushing time is 3-4 minute;
Nitrogen blowing operational requirement: during the beginning nitrogen blowing; 30-50mm under the top of the slag is inserted in the outlet of oxygen rifle, requires to be blown into nitrogen and will all get into top of the slag below, and slag is rotated; Time 1-2 minute; Begin dark nitrogen blowing after the FeSi fusing to be added and stir, oxygen rifle depth of penetration 400-600mm, nitrogen pressure is adjusted to 0.7-0.9Mpa.2-3 minute nitrogen flushing time; Through above-mentioned blowing, the mass percent of the composition of molten steel reaches:
C：2.5～3.0 Si：0.05～0.3 Mn：0.1～0.4 Ni：6.5～7.5
P：0.025～0.04 S：0.001～0.075 Cr：16.0～17.5 Cu：0～0.1；
All the other are Fe and unavoidable impurities.
The III nitrogen flushing finishes
Nitrogen flushing finishes to extract the oxygen rifle out the top of the slag, closes the nitrogen switch fire door is left in the rotation of fire door oxygen rifle.
Method steps I melting waste steel energising heating in the 39-51 minute steel scrap that this Electric furnace steel making reduction period is smelted can all melt steel scrap.
The method that this Electric furnace steel making reduction period is smelted, two bag (operation is the AOD stove of 45t under the electric furnace) molten steel compositions behind the electric furnace steel tapping, temperature are even; The slag phenomenon of overflowing in the tapping process obviously reduces Cr in the slag
2O
3Before more not improving, reduces content 1-2%.
Description of drawings
Fig. 1 is the synoptic diagram by electric furnace fire door oxygen supply gas and nitrogen of the method embodiment of this Electric furnace steel making reduction period smelting.
Among the above-mentioned figure:
1-electric furnace fire door 2-oxygen rifle 3-air-supply duct 4-tensimeter 5-trip valve 6-trip valve 7-setter 8-hand valve 9-nitrogen inlet 10-nitrogen tube 11-Y-tube 12-oxygen hose 13-trip valve 14-oxygen intake
Embodiment
Specify the embodiment of the method that this Electric furnace steel making reduction period smelts below in conjunction with embodiment, but the embodiment of the method that this Electric furnace steel making reduction period is smelted is not limited to following embodiment.
Embodiment
Present embodiment is an example with 304 steel, and the method that this Electric furnace steel making reduction period is smelted is described.With the tall and thin uhp electric arc furnace of 90 tons of capacity, power is 90WVA, the tall and thin type of electric furnace model.The electric furnace fire door oxygen supply gas that present embodiment is used and the pipeline of nitrogen and the connecting relation of valve are seen Fig. 1.The air-supply duct 3 of the oxygen rifle 2 of electric furnace fire door 1 is connecting Y-tube 11, is connecting oxygen hose 12 and nitrogen tube 10 by Y-tube 11.Connecting trip valve 13 in nitrogen tube 12, connecting pressure valve 4, trip valve 5, trip valve 6, variable valve 7 and hand valve 8 successively in nitrogen tube 10.Oxygen hose 13 is connected with source of oxygen, and nitrogen tube 10 is connected with source nitrogen.Trip valve 5 is more reliable for cutting out with trip valve 6, and hand valve 8 uses when being maintenance.The range of variable valve 7 is 0～1.0Mpa.
The step of present embodiment is following:
The I melting waste steel
The full steel scrap of following quality per distribution ratio is added in the electric furnace:
C:2.7 Si:1.0 Mn:0.2 Ni:7.5 P:0.035 S:0.02 Cr:17.5Cu:0.03; All the other are Fe and unavoidable impurities.
Energising heating steel scrap (45 minutes) all melts steel scrap, and molten steel is heated to 1620 ℃, oxygen blast flow 1600Nm3/ minute, and oxygen blast 28 minutes, the furnace melting phase adds FeSi after finishing, and add-on is that molten steel per ton adds 3.3kg, gets into reduction period.
The II nitrogen flushing is stirred
Close oxygen valve, open the nitrogen valve and begin nitrogen blowing and stir, regulate the nitrogen pressure setter, pressure is set at 0.5Mpa, and nitrogen flushing flow is 900Nm
3/ minute, the nitrogen flushing time is 3 minutes;
Nitrogen blowing operational requirement: during the beginning nitrogen blowing; 40mm under the top of the slag is inserted in the outlet of oxygen rifle, requires to be blown into nitrogen and will all get into top of the slag below, and slag is rotated; 2 minutes time; Begin dark nitrogen blowing after the FeSi fusing to be added and stir, oxygen rifle depth of penetration 500mm, nitrogen pressure is adjusted to 0.8Mpa.2 minutes nitrogen flushing time; Through above-mentioned blowing, the mass percent of the composition of molten steel reaches:
All the other are Fe and unavoidable impurities for C:2.5 Si:0.15 Mn:0.2 Ni:7.62 P:0.036 S:0.02 Cr:16.75Cu:0.03.
The III nitrogen flushing finishes
Nitrogen flushing finishes to extract oxygen rifle 2 out the top of the slag, closes hand valve 8, trip valve 5 and trip valve 6 and stops nitrogen blowing, and fire door 1 is left in 2 rotations of oxygen rifle.
Cr in the present embodiment slag
2O
3Content is 3%.
Present embodiment trip valve 5, trip valve 6 and the also available manual valve of trip valve 13.Oxygen supply gas connects also with the pipeline of nitrogen can adopt alternate manner.
Claims (1)
1. the Electric furnace steel making reduction period method of smelting; It is to carry out at the electric furnace that possesses the function that oxygen blast gas fusing and nitrogen blowing stir; Electric furnace fire door oxygen rifle air-supply duct is connecting nitrogen pipeline and relevant by-pass valve control by Y-tube, on nitrogen pipeline, is connecting pressure valve, trip valve and variable valve successively; It comprises following sequential steps:
IMelting waste steel
The full steel scrap of following quality per distribution ratio is added in the electric furnace:
C：1.5～3.0 Si：0.5～1.3 Mn：0～0.4 Ni：6.5～8.5 P：0.025～0.04 S：0～0.075 Cr：16.5～18.5
Cu:0～0.1, all the other are Fe and unavoidable impurities;
Energising heating steel scrap all melts steel scrap, and molten steel is heated to 1590-1650 ℃, oxygen blast flow 1300-1900Nm
3/ minute, oxygen blast 20-35 minutes, the furnace melting phase adds FeSi after finishing, and add-on is molten steel 2.5-3.5kg per ton, gets into reduction period;
IINitrogen flushing is stirred
Close oxygen valve, open the nitrogen valve and begin nitrogen blowing and stir, regulate the nitrogen pressure setter, pressure is set at 0.4-0.6Mpa, and nitrogen flushing flow is 750-1050Nm
3/ minute, the nitrogen flushing time is 3-4 minutes;
Nitrogen blowing operational requirement: during the beginning nitrogen blowing; 30-50mm under the top of the slag is inserted in the outlet of oxygen rifle, requires to be blown into nitrogen and will all get into top of the slag below, and slag is rotated; 1-2 minutes time; Begin dark nitrogen blowing after the FeSi fusing to be added and stir, oxygen rifle depth of penetration 400-600mm, nitrogen pressure is adjusted to 0.7-0.9Mpa; 2-3 minutes nitrogen flushing time; Through above-mentioned blowing, the mass percent of the composition of molten steel reaches:
C：2.5～3.0 Si：0.05～0.3 Mn：0.1～0.4 Ni：6.5～7.5
P：0.025～0.04 S：0.001～0.075 Cr：16.0～17.5 Cu：0～0.1；
All the other are Fe and unavoidable impurities;
IIINitrogen flushing finishes
Nitrogen flushing finishes to extract the oxygen rifle out the top of the slag, closes the nitrogen switch fire door is left in the rotation of fire door oxygen rifle.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1085605A (en) * | 1993-08-10 | 1994-04-20 | 北京科技大学 | Technology for smelting ultralow-carbon high-chromium alloyed steel by subaerated induction furnace |
| KR20060077424A (en) * | 2004-12-30 | 2006-07-05 | 주식회사 포스코 | Apparatus for injecting nitrogen gas into an electric arc furnace |
| CN101705333A (en) * | 2009-11-28 | 2010-05-12 | 山西太钢不锈钢股份有限公司 | Reduction and utilization method of dedusting ash of stainless steel |
| CN101914715A (en) * | 2010-08-31 | 2010-12-15 | 振石集团东方特钢股份有限公司 | Method for smelting stainless steel mother liquor |
-
2011
- 2011-01-25 CN CN2011100320862A patent/CN102127615B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1085605A (en) * | 1993-08-10 | 1994-04-20 | 北京科技大学 | Technology for smelting ultralow-carbon high-chromium alloyed steel by subaerated induction furnace |
| KR20060077424A (en) * | 2004-12-30 | 2006-07-05 | 주식회사 포스코 | Apparatus for injecting nitrogen gas into an electric arc furnace |
| CN101705333A (en) * | 2009-11-28 | 2010-05-12 | 山西太钢不锈钢股份有限公司 | Reduction and utilization method of dedusting ash of stainless steel |
| CN101914715A (en) * | 2010-08-31 | 2010-12-15 | 振石集团东方特钢股份有限公司 | Method for smelting stainless steel mother liquor |
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