CN103014241A - Control method of smelting slag of SPHD steel for LF (Ladle Furnace) furnace - Google Patents
Control method of smelting slag of SPHD steel for LF (Ladle Furnace) furnace Download PDFInfo
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- CN103014241A CN103014241A CN2012100694916A CN201210069491A CN103014241A CN 103014241 A CN103014241 A CN 103014241A CN 2012100694916 A CN2012100694916 A CN 2012100694916A CN 201210069491 A CN201210069491 A CN 201210069491A CN 103014241 A CN103014241 A CN 103014241A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a control method of smelting slag of SPHD steel for an LF (Ladle Furnace) furnace. Taken a furnace which carries 120 tons of molten steel as an example, a CaO-Al2O3 slag system is adopted. The refine final slag consists of 55-60wt% of CaO, 4-7wt% of SiO2 and 28-32wt% of Al2O3, the ratio of CaO to Al2O3 is 1.7-1.9. The proportion of slag charge is as follows: 600-1000kg of lime, 180-200kg of fluorite, 280-320kg of synthetic slag, 350-450kg of calcium carbide, 150-300kg of aluminous slag ball and 130-170kg of efficient submerging agent which is based on submerged arc. The method comprises the step of: an argon section: waiting for 20-100N1.min-1, transmitting power at 100-500N1.min-1; adding slag at 100-500N1.min-1; alloying at 100-500N1.min-1; strongly blowing at 600N1.min-1; flexibly blowing at 20-100N1.min-1; performing smelting time control: the initial smelting temperature of the LF furnace is greater than or equal to 1540 DEG C; the processing period/min is greater than or equal to 30; high-shift power transmission time/min is smaller than or equal to 10; flexibly blowing time/min is greater than or equal to 8; and the refined white slag forming time of the LF furnace is smaller than 15minutes and the refine desulfurization degree of the LF furnace is greater than 60%.
Description
Technical field
The present invention relates to the refining slag control of smelting steel, the method is particularly useful for the smelting of LF stove SPHD steel grade.
Background technology
Still adopt traditional slagging process during present stage LF smelting low carbon al-killed class steel grade, use the foundation residue materials such as lime, the people is for carrying out the slag charge proportioning, and because fusing point is high, the refining slag making time is long, and desulfuration efficiency is low, the Al in the steel
2O
3Can not effectively remove Deng inclusion, affected the performance of LF refining furnace metallurgical function; Later stage is in order to control the requirement of the compositions such as sial in the steel, and the slag system poor fluidity is unfavorable for the Adsorption of inclusion, cause behind the continuous casting in water-coating port dross phenomenon serious, affect this steel grade and water rate in the company of continuous casting.
TOFD(Time-of-flight-diffraction technique of the present invention) detection technique, phase change and Image Feature Detection equipment inner wall crackle and corrosion pit defective according to the inner wall defect diffracted wave, TOFD detects can find that vertical depth greater than crackle and the corrosion pit of 1mm, can detect the inner wall defect of wall thickness 12mm and above metal parts.
The present invention is directed to the SPHD steel grade to the requirement of sial control, propose the whole control program of smelting, improve desulfurization degree at initial smelting period with control sial composition and serve as theme, the middle and later periods connects the rate of watering take control slag system flowability as target thereby improve continuous casting.
Summary of the invention
Order of the present invention is: the control method of SPHD steel grade metallurgical slag of the present invention, take control sial composition, raising desulfurization degree as target at initial smelting period, smelt the intermediary and later stages take control slag system flowability as target, even water rate thereby improve continuous casting, production effect is very remarkable.
The object of the present invention is achieved like this: a kind of control method of LF stove SPHD smelting steel slag, take the LF refining furnace of 120 tons of molten steel as example, adopt CaO-Al
2O
3Slag system; Its refining finishing slag consists of: wt%CaO=55-60; Wt%SiO
2=4-7; Wt%Al
2O
3=28-32, wt%CaO/wt%Al
2O
3=1.7-1.9;
The proportioning of slag charge wherein: lime 600-1000 kg, fluorite 180-200 kg, synthetic slag 280-320 kg, calcium carbide 350-450 kg, aluminium slag ball 150-300 kg, efficient submerged arc agent 130-170 kg, the submerged arc agent is as the criterion to bury electric arc;
Argon gas control section wherein: wait for 20～100Nlmin-1; Send electricity 100～500 Nlmin-1; Add slag charge 100～500 Nlmin-1; Alloying 100～500 Nlmin-1; Blow by force 600 Nlmin-1; Soft blow 20～100 Nlmin-1;
Wherein tap to tap time control: LF just refines temperature 〉=1540 ℃; Treatment cycle/min 〉=30; High tap position electric power feeding time/min≤10; Soft blow time/min 〉=8; Require LF refining white slag sludging time less than 15min, LF refining desulfuration rate is greater than 60%.
Described method, the suitable inclusion that reduces the low-silicon low-carbon Series Steel of this method improves this type of steel grade in the castability of sheet billet continuous casting.
The mechanism of action of the present invention: to slag system control category, the refining slag that the LF stove is commonly used has CaO-CaF
2, CaO-SiO
2, CaO-Al
2O
3Deng slag system.Because CaO-SiO
2The slag system sweetening power a little less than, and low-carbon (LC) to contain in the aluminum steel sour molten aluminium higher, to (SiO in the slag
2) reductive action is arranged, therefore containing aluminum steel at low-carbon (LC) is difficult to adopt CaO-SiO
2Slag system.Al by the aluminium deoxidation generation
2O
3More, these products can reach the content more than 10% in refining slag.Therefore, low-carbon (LC) contains the aluminum steel refining slag and also unlikely adopts CaO-CaF
2Slag system, but be to tend to adopt CaO-Al more
2O
3Slag system.In order to make refining slag have preferably sweetening effectiveness and to be conducive to come-up Al
2O
3Deng assimilation and the absorption (according to the similar compatibility principle) of deoxidation products, the refining final slag composition is selected in CaO-Al
2O
3-SiO
2The 12CaO7Al2O3 formation zone of phasor is at this zone Al
2O
3Content is about 30% or %CaO%/Al
2O
3There is the higher zone of Ls during=1.8 left and right sides, and lower at this zone refining slag melting point, be conducive to and the combination that is mingled with.The more important thing is, under this slag system condition by SiO
2The trend that reoxidizes of [Al] can be inhibited in the molten steel that causes.
The invention solves artificial slag charge proportioning, because fusing point is high, the refining slag making time is long, and desulfuration efficiency is low, the Al in the steel
2O
3Can not effectively remove Deng inclusion, affected the performance of LF refining furnace metallurgical function; Later stage is in order to control the requirement of the composition such as sial in the steel, and the slag system poor fluidity is unfavorable for the Adsorption of inclusion, middle water-coating port dross phenomenon is serious after causing continuous casting, must affect this steel grade waters the urgent eyebrows and eyelashes of rate in the company of continuous casting a production difficult problem, realize Design Conception, show technical progress.
Embodiment
The present invention is described further in conjunction with the embodiments.
Embodiment
Key points for operation:
1, smelts control
A) molten steel slag removing sample in place, steel sample inspection fractional analysis, and pass through to decide oxygen and decide the aluminium analyser, obtain oxygen, aluminium composition in the molten steel, according to the concrete numerical value of apparatus for determination of oxygen mensuration, requirement once drops into the aluminium composition at initial smelting period joins appropriately, and avoiding the later stage to mend aluminium, to cause the inclusion adsorption time not enough;
B) require adopt the desulfurization of the large quantity of slag high basicity slag early stage, according to front operation specified criteria, guarantee basicity and the submerged arc effect of slag, avoid the silicon in the secondary oxidation of steel displacement molten steel, then, according to the similar compatibility principle, first slag specimen with reference to the inspection fractional analysis quantitatively adds aluminium slag ball in batches, improves slag system, form fast white slag, deoxidation is good, and the later stage flowability and the foaminess of readjust slag system, by the calcium treatment process, improve inclusion morphology, focus on sex change and the removal of inclusion;
2, slag making control: analyze the content of steel inclusion and distribution situation (or open with continuous casting and to water, to connect and water rate and whether significantly rise to basis for estimation), finally determine the component proportions of slag system;
3, the matching principle of slag charge and process control require: the proportioning of slag charge should take into full account the starting condition (namely get and smelt just slag specimen inspection fractional analysis) that front operation provides, and according to inspection fractional analysis present situation, implements the slag charge proportioning.
Slag charge is selected: lime, fluorite, synthetic slag; Reductor is selected; Calcium carbide, aluminium slag ball; Submerged arc agent: efficient submerged arc agent; White slag formation time/min≤15; Basicity control (R) 〉=3.0;
The proportioning of slag charge is got and is smelted just slag specimen inspection fractional analysis, take the 120T molten steel as example:
1) proportioning of slag charge: lime 800 kg; Fluorite 200 kg; Synthetic slag 300 kg; Calcium carbide 400 kg; Aluminium slag ball 180 kg; Efficient submerged arc agent 150 kg(are as the criterion to bury electric arc); Alloying operation alloy is selected low carbon ferromanganese, ferro-aluminum (adding opportunity: after the reduction of top slag, 15min forbids adding ferro-aluminum before the tapping);
2) argon gas control is classified with discharge process: wait for 90Nlmin-1, molten steel is not exposed, and the top of the slag fluctuates slightly; Send electric 500 Nlmin-1, molten steel exposed surface≤200mm, submerged arc is respond well; Add slag charge 300 Nlmin-1, molten steel exposed surface≤100mm; Alloying 400 Nlmin-1, molten steel exposed surface≤300mm; Blow by force 600 Nlmin-1 molten steel exposed surface≤400mm; Soft blow 80 Nlmin-1, molten steel are not exposed, and the top of the slag fluctuates slightly;
3) tap to tap time control: LF just refines temperature 〉=1540 ℃; Treatment cycle/min 〉=30; High tap position electric power feeding time/min≤10; Soft blow time/min 〉=8; Require LF refining white slag sludging time less than 15min, LF refining desulfuration rate is greater than 60%.
Above-mentioned synthetic slag: use as molten steel scavenger when being applicable to ladle refining, have very strong deoxidation, sweetening power, can reduce oxygen in the steel and the content of inclusion, and fusing point low (about 1500 ℃), be convenient to quick shape scorification slag, this product is to water the knot melting with multiple fine fodder by uniform stirring pelletizing high temperature to form, generate 7A12.C with addition of an amount of lime when this refining slag uses and be main low melting point aluminate product, can with steel in oxygen, sulphur fully react and the absorption reaction product, reach the purpose of cleaning molten steel; Its supplier: the magnificent Science and Technology Ltd. of the new smelting in Xinjiang.
Above-mentioned efficient submerged arc agent: this refining submerged arc slag can be in time, continue, stable foaming, has all the time good submerged arc effect during heated by electrodes.This product fully satisfies following characteristics: (1) satisfies refining submerged arc technique, reduces burn-back, prolongs electric furnace work-ing life.(2) Effective Raise LF stove heating efficiency prevents electrode erosion.(3) reduce the refining arc hissing; Supplier: Zhengzhou, henan Bandung furnace refractory company limited.
The production effect checking:
The inclusion content of SPHD steel and distribution are tending towards rationally, and continuous casting connects the rate of watering and significantly promotes, water-coating port dross stopping accident in the continuous casting, by the 8-10 at the beginning of the year rise/month, be reduced to 0-2 to rise/month, successful; Slag system has not only satisfied the requirement of the every composition index of this steel clock after improving, and has reached the dross accident control of this type of steel and the double goal of quality control; Similar enterprise smelts similar variety steel, can directly implement this technology.
Claims (4)
1. the control method of a LF stove SPHD smelting steel slag is characterized in that: take the LF refining furnace of 120 tons of molten steel as example, adopt CaO-Al
2O
3Slag system; Consisting of of its refining finishing slag: wt%CaO=55-60; Wt%SiO
2=4-7; Wt%Al
2O
3=28-32, wt%CaO/wt%Al
2O
3=1.7-1.9;
The proportioning of slag charge wherein: lime 600-1000 kg, fluorite 180-200 kg, synthetic slag 280-320 kg, calcium carbide 350-450 kg, aluminium slag ball 150-300 kg, efficient submerged arc agent 130-170 kg, the submerged arc agent is as the criterion to bury electric arc;
Argon gas control section wherein: wait for 20～100Nlmin-1; Send electricity 100～500 Nlmin-1; Add slag charge 100～500 Nlmin-1; Alloying 100～500 Nlmin-1; Blow by force 600 Nlmin-1; Soft blow 20～100 Nlmin-1;
Wherein tap to tap time control: LF just refines temperature 〉=1540 ℃; Treatment cycle/min 〉=30; High tap position electric power feeding time/min≤10; Soft blow time/min 〉=8; Require LF refining white slag sludging time less than 15min, LF refining desulfuration rate is greater than 60%.
2. method according to claim 1 is characterized in that: the synthetic slag of selecting is that molten steel scavenger uses, and supplier is the Xinjiang magnificent Science and Technology Ltd. of new smelting.
3. method according to claim 1, it is characterized in that: the efficient submerged arc agent of selecting has good submerged arc effect, and supplier is Zhengzhou, henan Bandung furnace refractory company limited.
4. method according to claim 1 is characterized in that: the suitable inclusion that reduces the low-silicon low-carbon Series Steel of this method, improve this type of steel grade in the castability of sheet billet continuous casting.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866088A (en) * | 2014-03-24 | 2014-06-18 | 莱芜钢铁集团有限公司 | Method for determining amount of slagging material and deoxidized alloy added into LF (Low-Frequency) refining furnace by use of reference heat method |
| CN105986063A (en) * | 2015-02-13 | 2016-10-05 | 鞍钢股份有限公司 | Method for producing cold-rolled sheet SPHD through VD |
| CN106884071A (en) * | 2015-12-16 | 2017-06-23 | 鞍钢股份有限公司 | The processing method of the low silicon aluminium killed steel of production is refined under the conditions of converter cold melt |
| CN107653358A (en) * | 2017-08-09 | 2018-02-02 | 新疆八钢铁股份有限公司 | The method of the quick deoxidation of LF refining furnace smelting process |
| CN108330250A (en) * | 2017-08-24 | 2018-07-27 | 新疆八钢铁股份有限公司 | A kind of LF refining furnace smelts the smelting process of SPHD steel grades |
| CN108856665A (en) * | 2018-06-13 | 2018-11-23 | 山东钢铁股份有限公司 | A kind of Si killed steel smelting process that sizing formula casting Aluminum steel packet uses |
| CN115786645A (en) * | 2022-12-07 | 2023-03-14 | 芜湖新兴铸管有限责任公司 | 10B21 steel refining slag system and smelting method of 10B21 steel |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866088A (en) * | 2014-03-24 | 2014-06-18 | 莱芜钢铁集团有限公司 | Method for determining amount of slagging material and deoxidized alloy added into LF (Low-Frequency) refining furnace by use of reference heat method |
| CN103866088B (en) * | 2014-03-24 | 2015-04-08 | 莱芜钢铁集团有限公司 | Method for determining amount of slagging material and deoxidized alloy added into LF (Low-Frequency) refining furnace by use of reference heat method |
| CN105986063A (en) * | 2015-02-13 | 2016-10-05 | 鞍钢股份有限公司 | Method for producing cold-rolled sheet SPHD through VD |
| CN106884071A (en) * | 2015-12-16 | 2017-06-23 | 鞍钢股份有限公司 | The processing method of the low silicon aluminium killed steel of production is refined under the conditions of converter cold melt |
| CN106884071B (en) * | 2015-12-16 | 2019-03-22 | 鞍钢股份有限公司 | Refining produces the processing method of low silicon aluminium killed steel under the conditions of converter cold melt |
| CN107653358A (en) * | 2017-08-09 | 2018-02-02 | 新疆八钢铁股份有限公司 | The method of the quick deoxidation of LF refining furnace smelting process |
| CN108330250A (en) * | 2017-08-24 | 2018-07-27 | 新疆八钢铁股份有限公司 | A kind of LF refining furnace smelts the smelting process of SPHD steel grades |
| CN108856665A (en) * | 2018-06-13 | 2018-11-23 | 山东钢铁股份有限公司 | A kind of Si killed steel smelting process that sizing formula casting Aluminum steel packet uses |
| CN108856665B (en) * | 2018-06-13 | 2020-09-18 | 山东钢铁股份有限公司 | Silicon-killed steel smelting method for fixed-diameter casting of aluminum-containing steel ladle |
| CN115786645A (en) * | 2022-12-07 | 2023-03-14 | 芜湖新兴铸管有限责任公司 | 10B21 steel refining slag system and smelting method of 10B21 steel |
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Application publication date: 20130403 |