CN102321783B - Steel-making method of experimental induction furnace - Google Patents
Steel-making method of experimental induction furnace Download PDFInfo
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- CN102321783B CN102321783B CN 201110277431 CN201110277431A CN102321783B CN 102321783 B CN102321783 B CN 102321783B CN 201110277431 CN201110277431 CN 201110277431 CN 201110277431 A CN201110277431 A CN 201110277431A CN 102321783 B CN102321783 B CN 102321783B
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Abstract
The invention relates to a steel-making method of an experimental induction furnace, comprising the following steps of: electrifying and completely melting solid metal charge in a furnace; blowing oxygen into the furnace from a furnace top by adopting a fixed position manner or a gradual water-cooling oxygen lance position lowering manner; slagging; changing bottom blowing gas flow rate when top blowing oxygen is 15-16min; when mass percent of carbon in molten steel is less than 0.1%, stopping top oxygen supply; and removing slag in the furnace, then carrying out aluminium deoxidation, alloying and tapping according to type of steel which is made. The invention has the characteristics that: processing time is short, operation is flexible and effective; decarbonization, degasification, dephosphorization and sulphur impurity removal are carried out on molten metal in the induction furnace, molten iron can be rapidly smelted into steel, and great benefit is provided for expanding metallurgy function of the induction furnace and controlling variety, composition and product quality; good condition is provided for preferentially dephosphorizing during steelmaking, end phosphorous content is reduced to 0.010-0.0045wt%, environmental pollution and corrosion to lining of the induction furnace which are caused by solid cosolvent such as fluorite and the like can be eliminated.
Description
Technical field
The present invention relates to steelmaking technical field, specifically belong to a kind of method for making steel of basic-lined induction furnace.
Background technology
Medium-frequency induction furnace is that many enterprises are used for to solid metal melts and composition is adjusted conventional means, university and research institution also often carry out material development or manufacturability basic test by the small intermediate frequency induction furnace, this method is limited by medium-frequency induction furnace refractory life, smelting condition, is difficult to concentrate comprehensive refinings such as finishing decarburization, degassed, dephosphorization, desulfurization at same device.Be higher than the occasion of specification requirement at molten steel composition, the way that often adopts the heterogeneity molten steel to blend perhaps combines to implement multi-functional refining with outer processing of stove.
For example, Chinese patent application number: the production technique of the disclosed a kind of extra low carbon ferrochromium alloy of CN200710034451.7, need to heat up the high carbon ferro-chrome medium-frequency induction furnace fusing of packing into, then molten metal is blended in the tank, move into again the vacuum refinement station and carry out that argon oxygen is mixed to be blown, to produce humble carbon ferrochrome.The method that the disclosed a kind of frequency-conversion induction furnace of Chinese patent application number: CN01108113.9 is smelted medium-low carbon ferromanganese, solid carbon ferromanganese is put into the fusing of the first induction furnace, then be blended into the second induction furnace and carry out again the top bottom blowing, at last by adding reductive agent and stirring, make that manganese is reduced in the iron in the slag.Chinese patent application number: CN201010268043.X] production method of disclosed a kind of austenitic stainless steel, need to adopt the method for electric furnace-AOD stove-LF stove series connection to come melting and adjust the metal ingredient temperature, to obtain austenitic stainless steel.The disclosed content of above-mentioned patent documentation, melt and smelting operation are not finished in same reaction unit, need to finish multi-functional refining in conjunction with outer processing of stove.
Chinese patent application number: CN 01108112.0 discloses a kind of method of smelting stainless steel with waste steel by frequency-conversion electric induction furnace, adds slag charge by the stainless steel waste material that melts and carry out the top bottom blowing in stove, adds at last reductive agent chromium in the slag is reduced in the steel.JP number of patent application: JP19870008777 discloses a kind of economic method of making chrome-bearing steel iron, and chrome ore, carbonaceous material, slag former are added refining furnace, carries out chromium reduction in decarburization and the slag by top oxygen supply-BOTTOM ARGON BLOWING, to obtain chrome-bearing steel iron.Its two disclosed contents of document belong to the production decision that adopts electric arc furnace or refining furnace to prepare chromium stainless steel iron, do not comprise making the pig iron smelt into rapidly the necessary decarburization of steel and dephosphorization and desulfurization task.
The KR number of patent application that retrieves: the KR20040074725 patent documentation, a kind of method that improves electric-arc furnace steelmaking metallic reducing rate is disclosed, winding-up oxygen and nitrogen improve the metallic reducing rate above pool side.Number of patent application is the patent documentation of CN201110032086.2, discloses a kind of smelting process of Electric furnace steel making reduction period, and it stirs the raising reduction efficiency by the spray gun nitrogen flushing of inserting under the top of the slag after adding Fe-Si.US number of patent application: US19880276612 discloses a kind of reduction of iron ore method, the iron ore after preheating and the prereduction, carbonaceous material is put into the thawing reduction furnace carry out top bottom blowing stirring reduced iron.Described three patent documentations all do not relate to the oxidation refining process of medium-frequency induction furnace steel-making.
Chinese patent application number: CN200610040303.1 discloses a kind of method with the induction furnace direct steelmaking, the scum of first powdered iron ore, iron scale, magnetic separation being processed is skimmed after placing and being smelted into molten iron in the induction furnace, pass into lime powder again and oxygen blows, cast at last steel ingot or steel billet.Document Pozzi, Marcello.Operating results of the EAF optimization system at Riva Verona.Metall Plant Technol Int.-60-69 is disclosed to be a kind of EAF stove steel-making expert systems, relate generally to carbon/oxygen, methane conversion, flue gas, electric power adjustment, methane and notes carbon function have no its method and technical parameter and relate to the scheme that adopts bottom blowing quick decarburization in top under the sensed conditions and remove phosphorus sulphur.
Therefore, further excavate refining function and the efficient of existing medium-frequency induction furnace, make it to change the method that can carry out multi-functional refining into, the metallargist is carried out experimental study, the state of the art and the variety and quality that improve induction furnace steel-smelting are of great significance and value.
Summary of the invention
The objective of the invention is to overcome the deficiency that has the medium-frequency induction furnace metallurgical function now a kind of top and bottom blowing steel method based on medium-frequency induction furnace is provided, can be to molten metal decarburization, the degassed and impurity elements such as removal phosphorus, sulphur in same induction furnace, make molten iron smelt into rapidly steel, the tapping phosphorus content can be down to the method for making steel of the experiment usefulness induction furnace of 0.010～0.0045Wt.%.
Realize the technical measures of above-mentioned purpose:
A kind of method for making steel of testing with induction furnace, its step:
1) energising is melted the solid metal material in the stove fully;
2) adopt the water cooled oxygen lance oxygen of jetting in from furnace roof to stove, the converting process oxygen lance position immobilizes, and oxygen supply intensity is 3.1～3.3Nm
3/ min is blown into argon gas or nitrogen gas stirring from the furnace bottom gas supply element simultaneously, and air supply intensity is steel 0.05～0.15Nm per ton
3/ min;
3) slag making: adopt lime and rhombspar, add-on is lime 50～52kg/ ton steel, rhombspar 16～18kg/ ton steel;
4) when top blowing oxygen time to 15～16min, change Bottom Blowing Gas Flow Rate, by steel 0.08～0.18Nm per ton
3/ min is blown into argon gas and stirs;
5) when the mass percent of carbon in the molten steel＜0.1%, finish the top oxygen supply, slag dual alkalinity CaO/SiO
2Be controlled at 2.7～3.0, the bottom is by steel 0.10～0.20Nm per ton
3/ min continues to be blown into argon gas and stirs, and the treatment time is 4～8 minutes;
6) in stove, remove the gred, then, carry out aluminium deoxidation and alloying according to institute's steelmaking kind, at last tapping.
It is characterized in that: the induction furnace steel-smelting process is 20～45 kilowatts for electric output power.
It is characterized in that: 40～45 % of place when described oxygen lance position is fixed on oxygen lance blow head apart from the static degree of depth of molten steel.
A kind of method for making steel of testing with induction furnace, its step:
1) energising is melted the solid metal material in the stove fully;
2) adopt the water cooled oxygen lance oxygen of jetting in from furnace roof to stove, the converting process oxygen lance position operates for step-down progressively, and oxygen supply intensity is steel 3.3～3.5Nm per ton
3/ min;
3) slag making: adopt lime, rhombspar and fluorite, add-on is lime 53～54kg/ ton steel, rhombspar 18～20kg/ ton steel, fluorite≤4.5kg/ ton steel;
4) when the mass percent of carbon in the molten steel＜0.1%, finish the top oxygen supply, slag dual alkalinity CaO/SiO
2Be controlled at 2.8～3.2, the bottom is by steel 0.15～0.25Nm per ton
3/ min is blown into argon gas and stirs, and the treatment time is 6～10 minutes;
5) in stove, remove the gred, then, carry out aluminium deoxidation and alloying according to institute's steelmaking kind, at last tapping.
It is characterized in that: the induction furnace steel-smelting process is for 20～45 kilowatts of electric output powers.
It is characterized in that: described oxygen lance position progressively step-down operation carries out in such a way: in 0～5min oxygen lance position when the static degree of depth of molten steel 50%, in 5～15min oxygen lance position when the static degree of depth of molten steel 60%, when 15min～oxygen blast finishes oxygen lance position when the static degree of depth of molten steel 70%.
Employing the invention has the beneficial effects as follows:
(1) provide a kind of multi-functional smelting process with induction heating and top bottom blowing characteristics, the treatment time is short, flexible operation is effective.
(2) to molten metal in the induction furnace carry out decarburization, degassed, remove phosphorus, sulphur impurity element, can make molten iron smelt into rapidly steel, very large to metallurgical function, control kind composition and the quality product benefit of expansion induction furnace.
(3) the present invention provides good condition for making steel preferential dephosphorization, and the tapping phosphorus content is down to 0.010～0.0045Wt.%, can eliminate the solid solubility promoter such as fluorite to the pollution of environment and the erosion of furnace lining.
Embodiment
Below the invention will be further described:
Experiment condition is medium-frequency induction furnace.
Embodiment 1
The solid metal material 61Kg that in medium-frequency induction furnace, packs into, the smelting low carbon Low-phosphorus Steel, smelting process is for 30～45 kilowatts of electric output powers.Its test steel-making step:
1) energising is melted the solid metal material in the stove fully;
2) adopt the water cooled oxygen lance oxygen of jetting in from furnace roof to stove, the converting process oxygen lance position is fixed at 40 % of place of oxygen lance blow head during apart from the static degree of depth of molten steel, and oxygen supply intensity is steel 3.1Nm per ton
3/ min is blown into nitrogen gas stirring from the furnace bottom gas supply element simultaneously, and air supply intensity is steel 0.05～0.10Nm per ton
3/ min;
3) slag making: adopt lime and rhombspar, add-on is lime 50kg/ ton steel, rhombspar 16kg/ ton steel;
4) when the top blowing oxygen time arrives 15min, change Bottom Blowing Gas Flow Rate, by steel 0.08Nm per ton
3/ min is blown into argon gas and stirs;
5) when the mass percent of carbon in the molten steel is 0.06%, finish the top oxygen supply, slag dual alkalinity CaO/SiO
2Be controlled at 2.7, the bottom is by steel 0.10Nm per ton
3/ min continues to be blown into argon gas and stirs, and the treatment time is 4 minutes;
6) in stove, remove the gred, then, carry out aluminium deoxidation and alloying according to institute's steelmaking kind, at last tapping.
The molten steel composition of present embodiment, carbon content are 0.04wt.%, and phosphorus content is 0.0045wt.%, and sulphur content is 0.023wt.%, and nitrogen content is 0.0013wt.%.
Embodiment 2
The solid metal material 60Kg that in medium-frequency induction furnace, packs into, the smelting low carbon steel, smelting process is for 20～40 kilowatts of electric output powers.Its test steel-making step:
1) energising is melted the solid metal material in the stove fully;
2) adopt the water cooled oxygen lance oxygen of jetting in from furnace roof to stove, 45 % of place when the converting process oxygen lance position is fixed on oxygen lance blow head apart from the static degree of depth of molten steel fix, and oxygen supply intensity is steel 3.3m per ton
3/ min is blown into argon gas from the furnace bottom gas supply element simultaneously and stirs, and air supply intensity is steel 0.08～0.15Nm per ton
3/ min;
3) slag making: adopt lime and rhombspar, add-on is lime 52kg/ ton steel, rhombspar 18kg/ ton steel;
4) when the top blowing oxygen time arrives 16min, change Bottom Blowing Gas Flow Rate, by steel 0.18Nm per ton
3/ min continues to be blown into argon gas and stirs;
5) when the mass percent of carbon in the molten steel is 0.085%, finish the top oxygen supply, slag dual alkalinity CaO/SiO
2Be controlled at 3.0, the bottom is by steel 0.20Nm per ton
3/ min continues to be blown into argon gas and stirs, and the treatment time is 8 minutes;
6) in stove, remove the gred, then, carry out aluminium deoxidation and alloying according to institute's steelmaking kind, at last tapping.
The molten steel composition of present embodiment, carbon content are 0.06wt.%, and phosphorus content is 0.01wt.%, and sulphur content is 0.020wt.%, and nitrogen content is 0.0020wt.%.
Embodiment 3
The solid metal material 60Kg that in medium-frequency induction furnace, packs into, the smelting low carbon Low-phosphorus Steel, smelting process is for 30～45 kilowatts of electric output powers.Its test steel-making step:
1) energising is melted the solid metal material in the stove fully;
2) adopt the water cooled oxygen lance oxygen of jetting in from furnace roof to stove, converting process oxygen lance position step-down operation is carried out in such a way: 0.5min when the static degree of depth of molten steel 50%, 5.5min when the static degree of depth of molten steel 60%, when oxygen blast finishes when the static degree of depth of molten steel 70%; Oxygen supply intensity is steel 3.3Nm per ton
3/ min;
3) slag making: adopt lime, rhombspar and fluorite, add-on is lime 53kg/ ton steel, rhombspar 18kg/ ton steel, fluorite 4.5kg/ ton steel;
4) when the mass percent of carbon in the molten steel is 0.06%, finish the top oxygen supply, slag dual alkalinity CaO/SiO
2Be controlled at 2.8, the bottom is by steel 0.15Nm per ton
3/ min is blown into argon gas and stirs, and the treatment time is 6 minutes;
5) in stove, remove the gred, then, carry out aluminium deoxidation and alloying according to institute's steelmaking kind, at last tapping.
The molten steel composition of present embodiment, carbon content are 0.04wt.%, and phosphorus content is 0.006wt.%, and sulphur content is 0.025wt.%, and nitrogen content is 0.0028wt.%.
Embodiment 4
The solid metal material 61Kg that in medium-frequency induction furnace, packs into, the smelting low carbon Low-phosphorus Steel, smelting process is for 20～40 kilowatts of electric output powers.Its test steel-making step:
1) energising is melted the solid metal material in the stove fully;
2) adopt the water cooled oxygen lance oxygen of jetting in from furnace roof to stove, converting process oxygen lance position step-down carries out in such a way: 4.5min when the static degree of depth of molten steel 50%, 15min when the static degree of depth of molten steel 60%, when finishing to oxygen blast when the static degree of depth of molten steel 70%; Oxygen supply intensity is steel 3.5Nm per ton
3/ min;
3) slag making: adopt lime, rhombspar and fluorite, add-on is lime 54kg/ ton steel, rhombspar 20kg/ ton steel, fluorite 2kg/ ton steel;
4) when the mass percent of carbon in the molten steel is 0.074%, finish the top oxygen supply, slag dual alkalinity CaO/SiO
2Be controlled at 3.0, the bottom is by steel 0.20Nm per ton
3/ min is blown into argon gas and stirs, and the treatment time is 8 minutes;
5) in stove, remove the gred, then, carry out aluminium deoxidation and alloying according to institute's steelmaking kind, at last tapping.
The molten steel composition of present embodiment, carbon content are 0.05wt.%, and phosphorus content is 0.009wt.%, and sulphur content is 0.024wt.%, and nitrogen content is 0.0026wt.%.
Embodiment 5
The solid metal material 62Kg that packs in medium-frequency induction furnace, the smelting steel grade is soft steel, is 25～45 kilowatts for electric output power.Its test steel-making step:
1) energising is melted the solid metal material in the stove fully;
2) adopt the water cooled oxygen lance oxygen of jetting in from furnace roof to stove, converting process oxygen lance position step-down carries out in such a way: 3min when the static degree of depth of molten steel 50%, when the static degree of depth of molten steel 60%, 15 minute of 9min when the static degree of depth of molten steel 70%; Oxygen supply intensity is steel 3.4Nm per ton
3/ min;
3) slag making: adopt lime and rhombspar, add-on is lime 54kg/ ton steel, rhombspar 18kg/ ton steel, fluorite 0kg/ ton steel;
4) when the mass percent of carbon in the molten steel is 0.054%, finish the top oxygen supply, slag dual alkalinity CaO/SiO
2Be controlled at 3.2, the bottom is by steel 0.25Nm per ton
3/ min is blown into argon gas and stirs, and the treatment time is 10 minutes;
5) in stove, remove the gred, then, carry out aluminium deoxidation and alloying according to institute's steelmaking kind, at last tapping.
The molten steel composition of present embodiment, carbon content are 0.02wt.%, and phosphorus content is 0.01wt.%, and sulphur content is 0.020wt.%, and nitrogen content is 0.0022wt.%.
Above-described embodiment is not whole only for exemplifying.
Claims (6)
1. test the method for making steel of using induction furnace, its step for one kind:
1) energising is melted the solid metal material in the stove fully;
2) adopt the water cooled oxygen lance oxygen of jetting in from furnace roof to stove, the converting process oxygen lance position immobilizes, and oxygen supply intensity is steel 3.1～3.3 Nm per ton
3/ min is blown into argon gas or nitrogen gas stirring from the furnace bottom gas supply element simultaneously, and air supply intensity is steel 0.05～0.15Nm per ton
3/ min;
3) slag making: adopt lime and rhombspar, add-on is lime 50～52 kg/ ton steel, rhombspar 16～18 kg/ ton steel;
4) when top blowing oxygen time to 15 ~ 16 min, change Bottom Blowing Gas Flow Rate, by steel 0.08～0.18Nm per ton
3/ min is blown into argon gas and stirs;
5) when the mass percent of carbon in the molten steel＜0.1%, finish the top oxygen supply, slag dual alkalinity CaO/SiO
2Be controlled at 2.7～3.0, the bottom is by steel 0.10～0.20Nm per ton
3/ min continues to be blown into argon gas and stirs, and the treatment time is 4～8 minutes;
6) in stove, remove the gred, then, carry out aluminium deoxidation and alloying according to institute's steelmaking kind, at last tapping.
2. a kind of method for making steel of testing with induction furnace as claimed in claim 1, it is characterized in that: the induction furnace steel-smelting process is 20 ~ 45 kilowatts for electric output power.
3. a kind of method for making steel of testing with induction furnace as claimed in claim 1 is characterized in that: 40 ~ 45 % places when described oxygen lance position is fixed on oxygen lance blow head apart from the static degree of depth of molten steel.
4. test the method for making steel of using induction furnace, its step for one kind:
1) energising is melted the solid metal material in the stove fully;
2) adopt the water cooled oxygen lance oxygen of jetting in from furnace roof to stove, the converting process oxygen lance position operates for step-down progressively, and oxygen supply intensity is steel 3.3～3.5Nm per ton
3/ min;
3) slag making: adopt lime, rhombspar and fluorite, add-on is lime 53～54kg/ ton steel, rhombspar 18～20kg/ ton steel, fluorite≤4.5 kg/ ton steel;
4) when the mass percent of carbon in the molten steel＜0.1%, finish the top oxygen supply, slag dual alkalinity CaO/SiO
2Be controlled at 2.8～3.2, the bottom is by steel 0.15～0.25Nm per ton
3/ min is blown into argon gas and stirs, and the treatment time is 6～10 minutes;
5) in stove, remove the gred, then, carry out aluminium deoxidation and alloying according to institute's steelmaking kind, at last tapping.
5. a kind of method for making steel of testing with induction furnace as claimed in claim 4, it is characterized in that: the induction furnace steel-smelting process is 20 ~ 45 kilowatts for electric output power.
6. a kind of method for making steel of testing with induction furnace as claimed in claim 4, it is characterized in that: described oxygen lance position progressively step-down operation carries out in such a way: in 0 ~＜5 min oxygen lance position when the static degree of depth of molten steel 50%, in 5 ~＜15 min oxygen lance position when the static degree of depth of molten steel 60%, when 15min ~ oxygen blast finishes oxygen lance position when the static degree of depth of molten steel 70%.
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| CN 201110277431 CN102321783B (en) | 2011-09-19 | 2011-09-19 | Steel-making method of experimental induction furnace |
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| CN102321783B true CN102321783B (en) | 2013-03-20 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102936638B (en) * | 2012-11-09 | 2014-05-28 | 武汉钢铁(集团)公司 | Induction furnace dephosphorizing method by top and bottom blowing |
| CN102925629A (en) * | 2012-11-12 | 2013-02-13 | 武汉钢铁(集团)公司 | Induction furnace dephosphorization method adopting top and bottom blowing |
| CN105463156B (en) * | 2015-12-02 | 2017-08-29 | 四川民盛特钢锻造有限公司 | A kind of method of intermediate frequency furnace smelting ultralow-carbon stainless steel |
| CN107790649B (en) * | 2016-08-31 | 2019-06-25 | 鞍钢股份有限公司 | Method for directly and continuously casting molten iron into steel billet |
| CN110343815A (en) * | 2018-04-08 | 2019-10-18 | 吉林常春高氮合金研发中心有限公司 | A method of improving useless high nitrogen steel mechanical property |
| CN115305309B (en) * | 2022-08-26 | 2024-01-19 | 马鞍山钢铁股份有限公司 | Electric furnace smelting method for carbon-retaining dephosphorization |
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| CN1077751A (en) * | 1993-03-02 | 1993-10-27 | 李吉柱 | Intermediate frequency furnace steelmaking method |
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