CN102634628A - Optimization method for producing low-oxygen steel by converter - Google Patents
Optimization method for producing low-oxygen steel by converter Download PDFInfo
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- CN102634628A CN102634628A CN2012101007032A CN201210100703A CN102634628A CN 102634628 A CN102634628 A CN 102634628A CN 2012101007032 A CN2012101007032 A CN 2012101007032A CN 201210100703 A CN201210100703 A CN 201210100703A CN 102634628 A CN102634628 A CN 102634628A
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Abstract
The invention relates to an optimization method for producing low-oxygen steel by a converter. The method comprises the process steps of: tapping when [C] in end-point molten steel of the converter is greater than or equal to 0.10at%, and drossing after tapping; controlling the basicity CaO/SiO2 weight ratio of an LF (ladle furnace) slag between 3.5 and 4.5, and FeO and MnO contents in the slag smaller than or equal to 0.8wt%; controlling aluminum content in refined steel of the LF between 0.020at% and 0.030at%; and controlling soft argon blowing time of VD (vacuum degassing) at 15-20 minutes and soft argon blowing flow at 80-100 N1/min. The optimization method has the advantages that the lower limiting value of carbon content at the end point of the converter is lower, and the adaptability to different qualities of molten steel is strong; the tapped steel of the converter is subjected to strong deoxidizing by aluminum ferromanganese; the slag baffle of steel tapping of the converter is poor, and the oxidizability of the slag is reduced by drossing; no calcium treatment is carried out after VD; no phenomenon of blocking a water gap is generated in a continuous casting process; and full-oxygen mass content in the steel can be controlled within a range smaller than or equal to 10*10(-6).
Description
Technical field:
The present invention relates to a kind of converter and produce the optimization method of low-oxygen steel, particularly a kind of optimization method of under molten iron pre-desulfurization-top and bottom combined blown converter-LF refining-VD vacuum-treat-continuous casting process condition, producing low-oxygen steel belongs to the field of steel-making that metallurgical industry is produced.
Background technology:
The total oxygen content of steel and the quality of steel have direct relation, are major criterions estimating steel product quality, and for mechanical property and the anti-fatigue performance that improves steel, Iron And Steel Company all is devoted to the production research of ultra low oxygen steel both at home and abroad.
In " special steel " published in December, 2010 " low oxygen content GCr15 bearing steel production technique is put into practice "; Shi Gang is in 60t LD-LF-VD-CC production technique; Through the tapping of exploitation high-carbon hypoxemia, control LD tapping down the quantity of slag, LF put in place white slag technology, the special-purpose refining slagging process of bearing steel, stage by stage Argon technology, optimize system's control techniques such as continuous casting process, make the average total oxygen mass content fluctuation of GCr15 bearing steel in (6～9) * 10
-5, wherein≤7 * 10
-6The stove number account for 82.8% of total stove number; In " special steel " that publish in January, 2003 " GCr15 bearing steel smelting technology is analyzed and discussed "; The Huaihe River steel is in the EAF-LF flow process; Through adopting antivacuum ladle refining, barium alloy to handle and the protection slag-blocked tapping, can make bearing steel total oxygen mass content drop to 10 * 10
-6Below.
Baogang year December in November, 2010 to 2011, produce low-oxygen steel (GCr15 bearing steel) 255 stoves altogether, in molten iron pre-desulfurization-top and bottom combined blown converter-LF refining-VD vacuum-treat-continuous casting process, through tapping during [C]>=0.06at% in the control converter terminal molten steel; LF refining controlling target aluminium content, LF is offed normal, and aluminium content is controlled between the 0.015-0.040at% in the steel; Control basicity of slag CaO/SiO
2Weight ratio is (FeO+MnO)≤1wt% between 2.8-4.5, in the slag; The VD soft blow argon time is controlled at>=10min, and soft blow argon flow is greater than 30Nl/min, and the entire oxygen content in the steel mass content is controlled at≤and 12 * 10
-6, and smaller or equal to 10 * 10
-6The stove number account for 44% of total stove number.
Summary of the invention
The object of the invention provides a kind of under molten iron pre-desulfurization-top and bottom combined blown converter-LF refining-VD vacuum-treat-continuous casting process condition, and through the smelting process technology controlling and process, the optimization method of low-oxygen steel is produced in the converter that makes entire oxygen content in the steel content reach lower level.
The process step that technical scheme of the present invention realizes is following:
(1) tap during [C] >=0.10at% in the control converter terminal molten steel, tapping is skimmed later;
(2) add the reductor aluminum-manganese-iron alloy in order earlier during the converter tapping alloying, add ferrosilicon and ferromanganese again and carry out Alloying Treatment, ladle gets into the station of skimming and skims;
(3) control LF basicity of slag CaO/SiO
2Weight ratio is (FeO+MnO)≤0.8wt% between 3.5-4.5, in the slag;
(4) control LF refining is offed normal, and aluminium content is controlled between the 0.020-0.030at% in the steel;
(5) the VD soft blow argon time is controlled at 15～20min, and soft blow argon flow is at 80～100Nl/min.
Said control basicity of slag is realized through in molten steel, adding slag former;
Said slag former is lime, fluorite, bauxitic clay and calcium carbide.
Particularly: the mass percent of [C]>=0.10% o'clock tapping in the converter terminal molten steel; Add the reductor aluminum-manganese-iron alloy during converter tapping in order earlier, add ferrosilicon and ferromanganese again and carry out Alloying Treatment, that deoxidation products at first forms like this is Al
2O
3, be convenient to from molten steel, float fast, the aluminum-manganese-iron alloy add-on be control LF in place, give behind the electrochemical slag amount of aluminium content between 0.06at%-0.09at% in the steel; Ladle gets into the station of skimming and skims; Ladle get into the LF stove in place after, in stove, add lime, fluorite, bauxitic clay, calcium carbide slag making, make the LF basicity of slag CaO/SiO that offs normal
2Weight ratio is controlled between the 3.5-4.5, (FeO+MnO)≤0.8wt% in the slag; Aluminium content in the control steel; Make the LF stove off normal in the steel aluminium content between 0.020at%-0.030at%; Can prevent so promptly in the steel that aluminium content is low excessively causes deoxidation not enough and oxygen content in steel is raise, and can prevent aluminium too high levels in the steel again and causes in the steel [Al] with (SiO in the slag
2) reduction, oxygen content in steel is raise; The soft blow argon time behind the control VD vacuum breaker is at 15～20min; Soft blow argon flow is at 80～100Nl/min; Be that the flow control of soft blow argon can stirred molten steel; And the molten steel face does not expose in air is advisable, and does not feed aluminum steel in the VD vacuum or adds aluminum-manganese-iron alloy, and VD does not feed calcium line after finishing in steel.
The invention has the beneficial effects as follows: converter terminal carbon content lower value is lower, and is stronger to the molten iron flexibility of different mass; Converter tapping adopts the strong deoxidation of aluminium ferromanganese; The converter tapping pushing off the slag is bad, reduces slag oxidation property through skimming; Do not carry out calcium behind the VD and handle, in casting process, the water blocking mouthh phenomenon can not take place, can the entire oxygen content in the steel mass content be controlled at≤10 * 10
-6Scope in.
Embodiment:
Under molten iron pre-desulfurization-top and bottom combined blown converter-LF refining-VD vacuum-treat-continuous casting process condition, when producing the GCr15 bearing steel,, taked following embodiment to the control of oxygen content in steel:
(1) when the converter terminal liquid steel temperature at 1630 ℃-1660 ℃, in the molten steel mass percent of [C] reach >=the 0.10at% condition can tap; During converter tapping 1/3; Along with flowing to, steel adds the aluminum-manganese-iron alloy deoxidation in the ladle; Add ferrosilicon and manganeseiromization again, the aluminum-manganese-iron alloy add-on be make the LF stove in place, give behind the electrochemical slag that aluminium content adds lime 3kg/t simultaneously in the steel in ladle between 0.06at%-0.09at%; Ladle gets into the station of skimming and skims;
(2) ladle get into the LF stove in place after, in stove, add 8-9kg/t lime, 1.5-2kg/t fluorite, 1.5-2kg/t bauxitic clay, 1.5-2kg/t calcium carbide and carry out slag making, make the LF basicity of slag CaO/SiO that offs normal
2Weight ratio is (FeO+MnO)≤0.8wt% between 3.5-4.5, in the slag; Send electrochemical slag to get aluminium content in the steel appearance check steel in the time of 10 minutes, if when being lower than target lower limit 0.06at%, need in steel, to add aluminium ferromanganese or the feeding aluminum steel is mended aluminium, add-on is to make the LF stove off normal in the steel aluminium content between 0.020at%-0.030at%;
(3) molten steel gets into the VD stove and vacuumizes processing; Under vacuum tightness≤0.10Kpa condition; Dark vacuum time>=15min carries out the soft blow argon to molten steel behind the VD vacuum breaker, soft blow argon time 15～20min; Soft blow argon flow 80～100Nl/min (can molten steel be stirred, and the molten steel face do not expose in air be advisable).
Through above-mentioned embodiment, can make the low-oxygen steel of producing under molten iron pre-desulfurization-top and bottom combined blown converter-LF refining-VD vacuum-treat-continuous casting process condition (GCr15 bearing steel), the entire oxygen content in the steel mass content can be controlled in≤and 10 * 10
-6Scope.
Claims (5)
1. the optimization method of low-oxygen steel is produced in a converter, and it is characterized in that: the process step of said method is following:
(1) taps during [C] >=0.10at% in the control converter terminal molten steel;
(2) add the reductor aluminum-manganese-iron alloy in order earlier during converter tapping, add ferrosilicon and ferromanganese again and carry out Alloying Treatment, ladle gets into the station of skimming and skims;
(3) control LF basicity of slag CaO/SiO
2Weight ratio is (FeO+MnO)≤0.8wt% between 3.5-4.5, in the slag;
(4) control LF refining is offed normal, and aluminium content is controlled between the 0.020-0.030at% in the steel;
(5) the VD soft blow argon time is controlled at 15～20min, and soft blow argon flow is at 80～100Nl/min.
2. the optimization method of low-oxygen steel is produced in converter according to claim 1, it is characterized in that: said LF refining is offed normal in the steel control of aluminium content through in molten steel, adding aluminium ferromanganese or the feeding aluminium wire is realized.
3. the optimization method of low-oxygen steel is produced in converter according to claim 1, it is characterized in that: the control basicity of slag is realized through in molten steel, adding slag former.
4. the optimization method of low-oxygen steel is produced in converter according to claim 3, and it is characterized in that: said slag former is lime, fluorite, bauxitic clay and calcium carbide.
5. the optimization method of low-oxygen steel is produced in converter according to claim 1, it is characterized in that: reductor aluminum-manganese-iron alloy add-on be control LF in place, give behind the electrochemical slag amount of aluminium content between 0.06at%-0.09at% in the steel.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102909334A (en) * | 2012-11-16 | 2013-02-06 | 内蒙古包钢钢联股份有限公司 | Control method for cracks of continuous casting slabs of Cr-contained low alloy steel TDC76 |
| CN103866087A (en) * | 2014-03-24 | 2014-06-18 | 莱芜钢铁集团有限公司 | Method for aluminum killed steel for online computation of FeO content in pit slag in low frequency (LF) refining furnace |
| CN104212935A (en) * | 2014-08-22 | 2014-12-17 | 山东西王特钢有限公司 | Method for producing high-grade GCr15 bearing steel by using high-titanium chrome iron |
| CN107619906A (en) * | 2017-11-08 | 2018-01-23 | 攀钢集团攀枝花钢铁研究院有限公司 | Al deoxidization steel steel billet preparation method |
| CN113564297A (en) * | 2021-07-29 | 2021-10-29 | 广东韶钢松山股份有限公司 | Method for reducing content of manganese oxide in slag |
| CN115747420A (en) * | 2022-11-04 | 2023-03-07 | 北京包钢朗润新材料科技有限公司 | Three-step slag adjusting method suitable for refining high-manganese high-aluminum steel |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102909334A (en) * | 2012-11-16 | 2013-02-06 | 内蒙古包钢钢联股份有限公司 | Control method for cracks of continuous casting slabs of Cr-contained low alloy steel TDC76 |
| CN103866087A (en) * | 2014-03-24 | 2014-06-18 | 莱芜钢铁集团有限公司 | Method for aluminum killed steel for online computation of FeO content in pit slag in low frequency (LF) refining furnace |
| CN103866087B (en) * | 2014-03-24 | 2016-01-27 | 莱芜钢铁集团有限公司 | A kind of method of FeO content in line computation LF refining furnace enters the station slag being applicable to al-killed class steel grade |
| CN104212935A (en) * | 2014-08-22 | 2014-12-17 | 山东西王特钢有限公司 | Method for producing high-grade GCr15 bearing steel by using high-titanium chrome iron |
| CN104212935B (en) * | 2014-08-22 | 2016-03-16 | 山东西王特钢有限公司 | A kind of method with high titanium ferrochrome production high-quality GCr15 bearing steel |
| CN107619906A (en) * | 2017-11-08 | 2018-01-23 | 攀钢集团攀枝花钢铁研究院有限公司 | Al deoxidization steel steel billet preparation method |
| CN113564297A (en) * | 2021-07-29 | 2021-10-29 | 广东韶钢松山股份有限公司 | Method for reducing content of manganese oxide in slag |
| CN115747420A (en) * | 2022-11-04 | 2023-03-07 | 北京包钢朗润新材料科技有限公司 | Three-step slag adjusting method suitable for refining high-manganese high-aluminum steel |
| CN115747420B (en) * | 2022-11-04 | 2023-12-01 | 北京包钢朗润新材料科技有限公司 | Three-step slag adjusting method suitable for refining high-manganese high-aluminum steel |
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