CN105695661A - Method for smelting Q235B steel through CSP (compact strip production) line - Google Patents
Method for smelting Q235B steel through CSP (compact strip production) line Download PDFInfo
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- CN105695661A CN105695661A CN201610086804.7A CN201610086804A CN105695661A CN 105695661 A CN105695661 A CN 105695661A CN 201610086804 A CN201610086804 A CN 201610086804A CN 105695661 A CN105695661 A CN 105695661A
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- molten steel
- steel
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- slag
- carbide
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-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
Abstract
The invention discloses a method for smelting Q235B steel through a CSP (compact strip production) line. The method comprises the steps that end point carbon, phosphorus, sulfur and temperature of molten steel in a converter are well controlled, carbon powder and silicon carbide are added into a steel ladle before tapping or alloying of the molten steel, red ladle tapping is conducted, and the amount of tapping slag and the tapping time are well controlled; lime and steel ladle slagging agents are added into the molten steel in the tapping process, and when tapping of one third of the molten steel is completed, alloying treatment is conducted by adding ferrosilicon and ferroaluminium into the molten steel; when tapping of three fourths of the molten steel is completed and the ferrosilicon and the ferroaluminium are added, calcium carbide is added into the molten steel subjected to alloying treatment; the molten steel is sent to an LF furnace to be subjected to refining, the content of steel ladle top slag and the content of the molten steel are slightly adjusted by adding the lime, the ferrosilicon, the calcium carbide and the steel ladle slagging agents into the molten steel in the refining process, the molten steel is not subjected to calcium adding treatment, and the molten steel is taken out of the LF furnace; the cooling water volume and a reasonable continuous casting cooling curve are controlled during molten steel continuous casting; and the technical parameters of heating and rolling process of a casting blank are the same as original technical parameters, and the quality of the casting blank and the quality of a rolled plate are ensured. The molten steel is not subjected to calcium adding treatment, so that the production cost is reduced.
Description
Technical field
The present invention relates to the smelting process of a kind of straight carbon steel, particularly relate to the method that one utilizes close-coupled slab production line (CSP) to smelt Q235B steel。
Background technology
Background technology as the present invention is: applicant (enterprise) has a set of western mark of existing and complete Germany to produce continuous casting process line (i.e. CSP production line), product structure is based on Q235B, SPHC/D, wherein Q235B year output reaches more than 800,000 tons, identical with domestic same type production line。Produce 235B steel with this production line and adopt refining dephosphorization decarburization at the beginning of electric furnace or converter, tapping wash heat, adjust silicon, manganese composition, aluminum deoxidation again, pro-molten refining slag and aluminum shot slag making desulfurization is added by LF stove refine, fine setting silicon, manganese composition and temperature, molten steel obtains coils of hot-rolled steel through continuous casting and rolling after adding Calcium treatment。Adopting this technique to molten steel desulfurization rapidly, can meet high rhythm Production requirement, product grains degree is thin, and performance is had more than needed, but the dissolved aluminum [Als] in molten steel reaches more than 0.025%。Owing to molten steel must be added Calcium treatment, soft blow time >=6min, calcium/aluminum ratio=0.08～0.10%, production cost is higher, and molten steel nitrogen pick-up is serious, [N]=49ppm, [N]=56ppm in Metal in Tundish in molten steel during as gone out LF station。
Summary of the invention
It is an object of the invention to provide a kind of refined molten steel is not added with aluminium alloy and alumina-bearing material carry out slag making desulfurization, molten steel refined after in molten steel, do not feed calcium line carry out Calcium treatment thus saving production cost and ensureing that coiled sheet surface quality and performance meet the method that the CSP production line of customer requirement smelts Q235B steel。
For achieving the above object, the technical solution used in the present invention is: described a kind of CSP production line smelts the method for Q235B steel for pour in oxygen top bottom blowing converter by molten iron, in stove, it is blended into the steel scrap accounting for weight of molten iron 10% simultaneously, slag material Calx is added in stove, single-slag practice, finishing slag dual alkalinity controls 2.7～3.3, controls converter terminal molten steel carbon, phosphorus, the weight/mass percentage composition [C] >=0.10 of sulfur, [p]≤0.04, [S]≤0.05 and endpoint molten steel temperature T=1625 DEG C～1680 DEG C。
Tapping forward direction ladle adds carbon dust and carborundum, makes the carbon in molten steel, silicon weight/mass percentage composition meet the requirement of [C]=0.17～0.20, [Si]≤0.09。Tapping early stage adopts slag retaining cone gear pre-slag, tapping later stage employing floating plug gear later stage slag, controls the lower quantity of slag≤3.0kt/t, and red packet is tapped, the time of tapping >=3.0min。Tapping process adds Calx 3.0kg/t and ladle slagging agent 0.5kg/t in ladle molten steel。
Go out to start addition Antaciron 0.7kg/t and alfer 0.5kg/t in ladle molten steel three/a period of time at converter molten steel, molten steel has been carried out alloy treatment, adds Antaciron and alfer when converter molten steel has gone out 3/4ths。
Carbide is added: add carbide 1.00kg/t as weight/mass percentage composition [C]≤0.06 of converter molten steel aim carbon, add carbide 0.80kg/t as molten steel terminal [C]=0.06～0.08, add carbide 0.60kg/t as molten steel terminal [C]=0.80～1.00 and add carbide 0.40kg/t as molten steel terminal [C] >=0.10 in the molten steel after alloying。
Molten steel after Argon processes is transported to LF stove, first in ladle molten steel, carbide 0.30～0.50kg/t is added when molten steel enters LF stove, power transmission heats, and adds slag material Calx in power transmission heating process in batches in molten steel, and the addition of every batch of slag material Calx is by≤1.5kg/t。Adding carbide slag making in liquid steel refining sweetening process in molten steel, the dosage of carbide calculates to add 0.40kg/t carbide molten steel recarburization 0.01%, carries out molten steel composition fine setting。
Molten steel is going out refining station after LF stove refine, and the out-station temperature of the first stove molten steel controls at 1575 DEG C～1585 DEG C, with the follow-up out-station temperature watering molten steel for 1560 DEG C～1580 DEG C。
Continuous casting of molten steel after LF stove refine is become strand, control molten steel overheat, pulling speed of continuous casting 4.0～4.5m/min, continuous cast mold cooling water inflow diminishing 300～500L/min, narrow limit cooling water inflow diminishing 10L/min, secondary cooling water curve adopts 7# or 8# cooling curve, and two cold but water coefficients are by 1.05 controls。
Adopt the method for a kind of CSP production line smelting Q235B steel that as above technical scheme provides compared with prior art, have the technical effect that
1. according to thermodynamic principles, Ca and Al has very strong deoxidation, desulphurizing ability, and metallurgical reaction produces the free enthalpy change of compound, and Ca element deoxidizing capacity is more than Al。But owing to Ca boiling point is low, vapour pressure is high, density is little, it is the main cause causing its effective rate of utilization low that Ca be individually added in molten steel easily to evaporate, therefore the strong deoxidation of Ca element is given full play to, must by the form of elementary composition to it and other alloy, requiring that this element can make up the disadvantages mentioned above of Ca, C, Si can improve the dissolubility of Ca simultaneously。CaC can be adopted
2
In conjunction with Antaciron deoxidization desulfuration, simultaneously because CaC
2
Carbon is released in reaction, has strong reduction, and the CaS generated can be dissolved completely in CaC
2
In。When Ca and Al deoxidation simultaneously, the spherical 12CaO 7Al that fusing point is relatively low can be formed
2
O
3
, advantageously reduce foreign material in steel。The reducible Al of Ca simultaneously
2
O
3
, change the composition of field trash。
2. converter and LF stove all adopt carbide, Antaciron deoxidation, SiO in slag
2
Content is higher than former technique, although in the converter a small amount of alfer deoxidation of addition, but Al in slag
2
O
3
Few。Slag system alleged by the method and former technique slag system are had any different, and this method refining slag Composition Control is in conjunction with CaO-SiO
2
-Al
2
O
3
It can be seen that this method slag system controls in elliptic region, slag fusing point is between 1900～2000 DEG C, for controlling high-melting-point 2CaOSiO
2
Produce, improve refining slag mobility, therefore this method adopts fluorine-containing slagging agent slag。
3. the finished product material that this method produces occurs rotten limit phenomenon at first。Thinking that former technique adopts former alloying, molten steel solidification process forms AIN particle, between austenite crystal and crystal boundary precipitate out, hinder grain growth, play the effect of crystal grain thinning, improve strand plasticity。And this method finished product molten steel [Als] is vestige, and not having other molten steel solidification process to hinder the element of grain growth in molten steel, therefore when this method, casting blank crystal grains is thick, and strand plasticity is deteriorated, and the probability on rotten limit increases。By adjusting crystallizer cooling water flow and cooling ratio, improving strand secondary cooling zone and straightening temperature, effectively improve strand plasticity, rotten limit problem is solved。
4. this method goes out LF stove and Metal in Tundish nitrogen content significantly lower than former technique at molten steel, main cause is [Als] relatively low (60～80ppm) in molten steel, form AIN probability with [N] in molten steel to reduce, degree can stop molten steel to continue to inhale nitrogen together。In material, nitrogen content is lower, it may be possible to molten steel nitrogen in process of setting precipitates out, and departs from molten steel；And nitrogen is combined with Al in former technique molten steel, forms AIN and be retained in molten steel。
5. this method can reduce aluminum consumption, increase Antaciron, CaC
2
Carbide puts into, and does not need to carry out Calcium treatment, and steel per ton can reduce cost 7.23 yuan compared with former technique。Simultaneously because do not need feeding calcium line, can avoiding Calcium treatment process molten steel temperature drop, power consumption 2.7Kwh saved by ton steel, and steel per ton reduces cost 1.67 yuan, and ton steel comprehensively reduces cost 8.9 yuan。Produce about 300,000 tons of Q235B steel as a trial by the method at present, save cost 2,670,000 yuan。Calculate by producing 800000 tons of Q235B steel per year, it is possible to decrease cost 7,120,000 yuan/year。
Detailed description of the invention
Below the specific embodiment of the present invention is described in further detail。
It is at the CSP(CompactstripProduction from Germany's import that a kind of CSP production line of the present invention smelts the method for Q235B steel) processing line carries out, do not need another oil (gas) filling device, saving production cost, its production process route is: the Argon LF stove refine of mixed iron blast converter smelting Argon station is casting continuously to form base。
By first pouring mixed iron blast into through desulfurization pretreatment or without the blast-melted of desulfurization pretreatment, molten iron temperature or composition is made to reach smelting requirements。The molten iron released from mixed iron blast is poured in (if nominal capacity is 100 tons) oxygen top bottom blowing converter, in converter, be blended into the steel scrap (residual elements in steel scrap meet standard-required and clean, dry) accounting for weight of molten iron 10% simultaneously。Carry out top bottom blowing, known technology。
In converter, add slag material (such as Calx), adopt single-slag practice, finishing slag dual alkalinity (R=CaO/SiO
2
) control 2.7～3.3。Process slag, abundant dephosphorization are made。
Converter terminal controls。Make converter terminal molten steel carbon, phosphorus, sulfur weight/mass percentage composition be [C] >=0.10(such as [C]=0.10～0.16), [P]≤0.04([P]≤0.03) and [S]≤0.05, control converter terminal liquid steel temperature T=1625 DEG C～1680 DEG C。Prepare tapping。It can be seen that refine identical with former technique at the beginning of converter。
Before tapping, namely before molten steel is carried out alloying, in ladle, add carbon dust and molten steel is carried out just deoxidation by carborundum。And the addition of carbon dust and carborundum is determined according to fact, meet the requirement of the carbon in molten steel, silicon weight/mass percentage composition [C]=0.17～0.20, [Si]≤0.09。The grain warp of described carborundum can be >=10mm。
Tapping early stage adopts slag retaining cone to keep off pre-slag, and the tapping later stage adopts floating plug gear later stage slag, the lower quantity of slag≤3kg/t of strict control。Red packet is tapped, the time of tapping >=3.0min。
Adding 3.0kg/t Calx and 0.5kg/t ladle slagging agent in tapping process in ladle molten steel, ladle slagging agent is that product (such as Henan China Luoyang Hua Yuan metallurgical material company limited), prior art can be bought in market。The purpose adding ladle slagging agent is in that ladle is carried out wash heat。
Having gone out to start addition Antaciron 0.7kg/t and alfer 0.5kg/t in ladle molten steel three/a period of time at converter molten steel, molten steel is carried out Alloying Treatment, when molten steel has gone out 3/4ths, Antaciron and alfer add。Tapping process (on a small quantity) can add carborundum in ladle molten steel, but forbid in ladle molten steel, to add carborundum again in the tapping later stage or after having gone out molten steel。
When after molten steel alloying, addition carbide in the molten steel after alloying, the addition of carbide controls according to molten steel endpoint carbon content (wt%): as molten steel terminal [C]≤0.06 addition carbide 1.00kg/t, as molten steel terminal [C]=0.06～0.08 addition carbide 0.80kg/t, as molten steel terminal [C]=0.08～0.10 addition carbide 0.60kg/t, as molten steel terminal [C] >=0.10 addition carbide 0.10kg/t。Adding Antaciron, alfer and carbide in molten steel within 1/3～3/4 time of tapping can to deoxidation of molten steel alloying。
When converter molten steel after rolling, sample analysis Q235B molten steel composition (wt%): [C]=0.10～0.17, [Si]≤0.05, [P]≤0.040, [S]≤0.060 and [Als] >=0.010。
From the foregoing, it will be observed that converter molten steel Alloying Treatment adopts carbide, ferrosilicon and alfer to substitute original technique only with measuring big alfer, namely converter molten steel adopts cheap carbide (part) to substitute aluminium-containing alloy and alumina-bearing material, meets just refining liquid steel pre-deoxidizing requirement。
When molten steel after alloying send Argon station, row Argon processes, and the composition (wt%) when molten steel enters Argon station meets: [C]=0.10～0.16, [Si]=0.03～0.10, [Mn]≤0.35, [P]≤0.04 and [S]≤0.05。At Argon station to molten steel whole process BOTTOM ARGON BLOWING (Ar), when Argon is complete and molten steel goes out Argon station, close argon。Molten steel after Argon processes is transported to LF stove and carries out refine, be prepared in advance packed carbide, ladle slagging agent and carburant (such as carbon dust etc.) at LF stove platform, and get out Antaciron, manganeisen and Calx in LF stove alloy bucket。
First adding 0.30～0.50kg/t carbide when molten steel enters LF stove in ladle molten steel, power transmission heats, and adds slag material (such as Calx), the addition≤1.5kg/t of every batch of slag material Calx in power transmission heating process in batches in molten steel。Liquid steel refining sweetening process adds carbide slag making, carbide (CaC according to slag condition in molten steel
2
) addition make molten steel recarburization (with mass content) 0.01% calculate to add 0.40kg/t carbide, carry out trimming。It can be seen that molten steel adopts when LF stove refine carbide, Antaciron in conjunction with ladle slagging agent, Calx slag making desulfurization, do not use alumina-bearing material and aluminium-containing alloy (i.e. aluminium alloy) slag making, meet molten steel terminal desulfurization requirement equally。Fine setting molten steel composition and liquid steel temperature, cancels finished product molten steel dissolved aluminum [Als] content requirement, does not carry out adding Calcium treatment (namely not Calcium treatment)。
Molten steel is after LF stove refine, and molten steel composition (wt%) controls: [C]=0.17～0.20, [Si]≤0.09, [Mn]=0.10～0.35, [P]≤0.040 and [S]≤0.008。Molten steel goes out the out-station temperature of LF stove the first stove molten steel and controls at 1575 DEG C～1585 DEG C, with the follow-up out-station temperature watering molten steel for 1560 DEG C～1585 DEG C。
Molten steel after LF stove refine send CSP conticaster be casting continuously to form strand, controls molten steel overheat, watering front molten steel overheat lower than 15 DEG C or higher than 50 DEG C if opened, forbidding to open and watering。
Pulling speed of continuous casting controls at 4.0～4.5m/min, continuous cast mold cooling water inflow diminishing 300～500L/min, narrow limit cooling water inflow diminishing 10L/min, difference according to casting blank cross-section size, supporting optimization continuous casting cooling curve, namely secondary cooling water curve adopts 7# or 8#, and two cold but water coefficients control (wherein 7# or 8# cooling curve is that former CSP production line possesses) by 1.05。
Continuous casting billet enters heating furnace heating (soaking), thereafter the steel plate of required section it is rolled into, heating technique and rolling mill practice are identical with original Q235B Technology code, coils of hot-rolled steel is obtained through same hot rolling, ensure that the chemical composition (wt%) of Q235B finished steel meets: C=0.17～0.20, Si≤0.09, Mn=0.10～0.35, P≤0.040 and S≤0.008, meet Q235B steel standard-required。
Described t represents molten steel per ton。
Claims (3)
1. the method that a CSP production line smelts Q235B steel, molten iron is poured in oxygen top bottom blowing converter, the steel scrap accounting for weight of molten iron 10% it is blended in stove, slag material Calx is added in stove, single-slag practice, finishing slag dual alkalinity controls 2.7～3.3, controls converter terminal molten steel carbon, phosphorus, the weight/mass percentage composition [C] >=0.10 of sulfur, [P]≤0.04, [S]≤0.05 and endpoint molten steel temperature T=1625 DEG C～1680 DEG C；It is characterized in that: tapping forward direction ladle adds carbon dust and carborundum, make carbon in molten steel, silicon weight/mass percentage composition for [C]=0.17～0.20, [Si]≤0.09, tapping early stage adopts slag retaining cone gear pre-slag, the tapping later stage adopts floating plug gear later stage slag, control the lower quantity of slag≤3.0kt/t, red packet is tapped, the time of tapping >=3.0min, adds Calx 3.0kg/t and ladle slagging agent 0.5kg/t in tapping process in ladle molten steel；
Go out to start addition Antaciron 0.7kg/t and alfer 0.5kg/t in ladle molten steel three/a period of time at converter molten steel, molten steel has been carried out alloy treatment, adds Antaciron and alfer when converter molten steel has gone out 3/4ths；
Carbide is added: add carbide 1.00kg/t as weight/mass percentage composition [C]≤0.06 of converter molten steel aim carbon, add carbide 0.80kg/t as molten steel terminal [C]=0.06～0.08, add carbide 0.60kg/t as molten steel terminal [C]=0.80～1.00 and add carbide 0.40kg/t as molten steel terminal [C] >=0.10 in the molten steel after alloying；
Molten steel after Argon processes is transported to LF stove, first in ladle molten steel, carbide 0.3～0.5kg/t is added when molten steel enters LF stove, power transmission heats, and adds slag material Calx in power transmission heating process in batches in molten steel, and the addition of every batch of slag material Calx is by≤1.5kg/t；Adding carbide slag making in liquid steel refining sweetening process in molten steel, the addition of carbide calculates to add 0.4kg/t carbide molten steel recarburization 0.01%, carries out molten steel composition fine setting；
Molten steel is going out refining station after LF stove refine, and the out-station temperature of the first stove molten steel controls at 1575 DEG C～1585 DEG C, with the follow-up out-station temperature watering molten steel for 1560 DEG C～1580 DEG C；
Continuous casting of molten steel after LF stove refine is become strand, control molten steel overheat, pulling speed of continuous casting 4.0～4.5m/min, continuous cast mold cooling water inflow diminishing 300～500L/min, narrow limit cooling water inflow diminishing 10L/min, secondary cooling water curve adopts 7# or 8# cooling curve, and two cold but water coefficients are by 1.05 controls；
Above-mentioned t represents molten steel per ton。
2. the method that a kind of CSP production line according to claim 1 smelts Q235B steel, it is characterised in that: in converter molten steel tapping process, in ladle molten steel, add carborundum, forbid in ladle molten steel, to add carborundum again in the tapping later stage or after having gone out molten steel。
3. the method that a kind of CSP production line according to claim 1 smelts Q235B steel, it is characterised in that: converter molten steel and LF stove refined molten steel adopt carbide to substitute aluminium-containing alloy and alumina-bearing material, molten steel carries out alloying and slag making desulfurization, does not carry out adding Calcium treatment。
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108676964A (en) * | 2018-05-30 | 2018-10-19 | 舞阳钢铁有限责任公司 | A kind of production method of the micro- refining of Q235B grades of steel |
| CN109487029A (en) * | 2018-11-26 | 2019-03-19 | 山东钢铁股份有限公司 | A kind of method of deoxidation of primary converter production low-carbon low-silicon steel |
| CN111992685A (en) * | 2020-08-10 | 2020-11-27 | 湖南华菱涟源钢铁有限公司 | Method for reducing edge-rot defects of steel coil of Q355B in thin slab continuous casting and rolling production line |
| CN113122673A (en) * | 2019-12-30 | 2021-07-16 | 王虎 | CaC using calcium carbide2Process for pretreating converter blowing end point steel slag |
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| CN1966752A (en) * | 2006-02-11 | 2007-05-23 | 湖南华菱涟源钢铁有限公司 | Process for producing C-Mn-Al killed steel |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108676964A (en) * | 2018-05-30 | 2018-10-19 | 舞阳钢铁有限责任公司 | A kind of production method of the micro- refining of Q235B grades of steel |
| CN109487029A (en) * | 2018-11-26 | 2019-03-19 | 山东钢铁股份有限公司 | A kind of method of deoxidation of primary converter production low-carbon low-silicon steel |
| CN113122673A (en) * | 2019-12-30 | 2021-07-16 | 王虎 | CaC using calcium carbide2Process for pretreating converter blowing end point steel slag |
| CN111992685A (en) * | 2020-08-10 | 2020-11-27 | 湖南华菱涟源钢铁有限公司 | Method for reducing edge-rot defects of steel coil of Q355B in thin slab continuous casting and rolling production line |
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| Publication number | Publication date |
|---|---|
| CN105695661B (en) | 2018-04-17 |
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