CN103334050A - Process utilizing sheet billet continuous casting to manufacture low aluminum silicon calm carbon structural steel - Google Patents

Process utilizing sheet billet continuous casting to manufacture low aluminum silicon calm carbon structural steel Download PDF

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Publication number
CN103334050A
CN103334050A CN2013102331466A CN201310233146A CN103334050A CN 103334050 A CN103334050 A CN 103334050A CN 2013102331466 A CN2013102331466 A CN 2013102331466A CN 201310233146 A CN201310233146 A CN 201310233146A CN 103334050 A CN103334050 A CN 103334050A
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continuous casting
calm
slag
steel
sheet blank
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CN2013102331466A
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CN103334050B (en
Inventor
李梦英
张洪波
陈礼斌
王峰
杨晓江
于勇
王兰玉
王新东
张大勇
胡庆利
刘曙光
杨杰
张军国
席晓利
冯慧霄
李京哲
付建军
耿伟
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Tangshan Branch of HBIS Co Ltd
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Hebei Iron and Steel Co Ltd Tangshan Branch
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Abstract

The invention relates to a process utilizing sheet billet continuous casting to manufacture a low aluminum silicon calm carbon structural steel, and belongs to the technical field of steel smelting processes. The technical scheme comprises a blast furnace molten iron process, a revolving furnace smelting process, an LF refining process and a sheet billet continuous casting process. The chemical components of the carbon structural steel is redesigned, the deoxidation alloying manner of the revolving furnace smelting process and the LF refining process of the idiomatic aluminum silicon calm carbon structural steel manufactured by the sheet billet continuous casting, under the premise that liquid steel fully deoxidizes, and the low aluminum silicon calm carbon structural steel in a sheet billet short process meeting a standard requirement is manufactured. The process provided by the invention has the beneficial effects that a sheet billet continuous casting process is adopted to manufacture the low aluminum silicon calm carbon structural steel, high quality hot rolling plates meeting the standard requirement for general carbon structures are manufactured through redesigning the chemical components and optimizing a deoxidizing alloying process, the production time is shortened, the production cost is reduced, and the huge economic benefits are created.

Description

The technique of the calm structural carbon steel of the low aluminium silicon of a kind of sheet blank continuous casting production
 
Technical field
The present invention relates to the technique of the calm structural carbon steel of the low aluminium silicon of a kind of sheet blank continuous casting production, belong to smelting iron and steel Technology field.
Background technology
Since the eighties in last century, sheet billet continuous casting and rolling production line, with less investment, instant effect, the advantage such as cost is low, lumber recovery is high, obtains fast development.At present, the sheet billet continuous casting and rolling production line production capacity is nearly 8,000 ten thousand tons in the world, and China accounts for through 40%, but sheet blank continuous casting has its unique process characteristic: slab thickness little (50-70mm), pulling speed of continuous casting is fast, cooling intensity is large, setting time is short.In order to adapt to above-mentioned continuous casting process characteristics, avoid the impact of the bad casting billet surface subsurface bubble caused of deoxidation of molten steel on the coiled sheet quality, all sheet blank continuous castings all require cast aluminum killed steel, i.e. [Als] >=150ppm in all steel grade steel.And crystallizer for continuous casting of thin slabs thickness is little, immersion type water nozzle structure is flat, and for solving the nozzle clogging problem of cast aluminum killed steel, all aluminium killed steels need to carry out the calcium processing to realize inclusion modification.And to reach the inclusion modification effect, and require Ca/Al in molten steel to be controlled at 0.05-0.10, but calcium treated steel water corrode aggravation to continuous casting stopper rod, the mouth of a river, can reduce Cleanliness of Molten Steel.Carbon structural steel market capacity maximum for general structure, use properties is less demanding, without the impelling strength requirement.But, in order to meet the processing performance requirement of sheet blank continuous casting, thin slab is produced the control strict (S≤0.008%, P≤0.020%) of this type of steel grade S, P in to steel, need to control Als >=150ppm in steel.The short production general structure of thin slab structural carbon steel like this, the production cycle is long, and manufacturing cost increases, the product function surplus.
Summary of the invention
The object of the invention is to provide the technique of the calm structural carbon steel of the low aluminium silicon of a kind of sheet blank continuous casting production, adopt the calm structural carbon steel of the low aluminium silicon of sheet blank continuous casting production, design and control deoxidation alloying process by product composition, the carbon structure steel continuous casting billet that production meets the demands, solve the problems referred to above that exist in background technology.
Technical scheme of the present invention is: the technique of the calm structural carbon steel of the low aluminium silicon of a kind of sheet blank continuous casting production comprises blast-melted, converter smelting, LF refining, sheet blank continuous casting operation; Described converter smelting operation, finishing slag basicity is 3.0-3.5; Molten steel control composition mass percent C:>=0.08%, S≤0.025%, P≤0.020%; Terminal temperature: 1630-1660 ℃, terminal oxygen position :≤350ppm, finishing slag FeO mass percent≤22%, tapping time>=5 minute, deoxidation alloying; Described LF refining procedure, departures chemical composition mass percent: C: 0.18-0.22%, Mn 0.20-0.40%, S 0.008%, P 0.025%, Si≤0.12-0.25%, Als 0.0050-0.0080%, out-station temperature: 1580-1600 ℃; Described sheet blank continuous casting operation, molten steel temperature in tundish 1535-1555 ℃; It is 4.0-5.0m/min that pulling rate is controlled; Described converter smelting, LF refining and sheet blank continuous casting operation, middle Baogang water oxygen, nitrogen content total mass number are controlled as T[O]≤50ppm, [N]≤60ppm.
Described converter smelting operation, adopt automatically lower slag to detect and slag stopping pushing off the slag tapping, ladle top slag thickness of slag layer≤50mm; Add refining slag 1.8-2.2Kg/ ton steel, lime 1.8-2.2Kg/ ton steel during tapping, adopt the ferrosilicon deoxidation, the carburetting of employing carbon dust, high carbon ferromanganese are joined manganese, ferrosilicon is joined silicon.
Described converter smelting operation, during tapping molten steel 1/3, start to feed in raw material, and order of addition(of ingredients) is refining slag, lime, carbon dust, ferrosilicon, high carbon ferromanganese successively; Add alloy and slag making materials before tapping 3/4.
Described LF refining procedure, departures chemical composition mass percent: C: 0.18-0.22%, Mn 0.20-0.40%, S 0.008%, P 0.025%, Si≤0.12-0.25%, Als 0.0050-0.0080%.
Described sheet blank continuous casting operation, ladle adopts long nozzle to add argon gas-sealed protection molten steel to tundish, and crystallizer uses the high alkalinity covering slag, the weak type of cooling of the cooling employing of crystallizer and secondary, assurance straightening temperature >=800 ℃.
Finally, through the process furnace soaking, hot rolling production meets the carbon structure hot-rolled coil of standard-required.
The present invention, by the redesign to general carbon structure steel chemical composition, adopts the silicon deoxidation at converter tapping process, guarantees that the ladle molten steel composition meets product requirement; Desulfurization and composition, fine tune temperature are only carried out in the LF refining, and departures guarantee in steel [Als]: 0.0050-0.0080%; When the calm structural carbon steel of the low aluminium silicon of sheet blank continuous casting, the mouth of a river and stopper neither corrode also and do not stop up, and liquid level fluctuation of crystallizer is little, and controlling of production process is stable.Continuously cast bloom is without any defect, superior in quality.Hot-rolled coil chemical composition, surface quality and structure property meet standard-required fully.The present invention is by the design of product composition and the optimization of deoxidation alloying process, and the calm structural carbon steel of low aluminium silicon that meets standard-required in the short flow process production of thin slab is the technology development work that has challenge, novelty.
Beneficial effect of the present invention: the present invention adopts the calm structural carbon steel of the low aluminium silicon of thin slab casting production, by the redesign of chemical composition and the optimization of deoxidation alloying process, production meets the general carbon structure of standard-required high-quality hot-rolled coil, shorten the production time and reduced again production cost, can create great economic benefit.
Embodiment
The present invention will be further described by the following examples.
In an embodiment, the technical process of the calm structural carbon steel of the thin slab low aluminium silicon of short flow process production is: blast-melted → converter smelting → LF refining → sheet blank continuous casting.
The converter 150t of embodiment, LF refining 150t, sheet blank continuous casting: continuously cast bloom width 1250-1500mm, thickness 65mm, produce the low aluminium silicon of steel grade calm structural carbon steel, totally six embodiment.
Concrete operation step and each procedure technology parameter are controlled as follows:
(1) converter smelting operation
A. 1350 ℃ of molten iron temperatures, S=0.030%, P=0.120%;
B. converting process be take dephosphorization as major objective, requires the full range slag, and furnace temperature steadily rises;
C. finishing slag basicity R is 3.0-3.5, molten steel composition (mass percent) C:0.12%, S:0.028%, P:0.020%; Temperature: 1630-1660 ℃.
D. tapping is used and is used in conjunction clean ladle;
E. adopt automatically lower slag to detect and slag stopping pushing off the slag tapping, lower slag thickness 48mm; Tapping time >=5.0 minute;
F. refining slag add-on 2.08Kg/ ton steel, lime adding amount 2.05 Kg/ ton steel, the high carbon ferromanganese add-on is 156kg, ferrosilicon 260Kg, carbon dust 220Kg; ?
G. order of addition(of ingredients): refining slag, lime, carbon dust, ferrosilicon, high carbon ferromanganese.
(2) LF refining procedure
A. ladle enters the station, and connects the BOTTOM ARGON BLOWING pipe, and Argon is stirred by force;
B. give electrochemical slag, according to S, determine the lime that need add and fluorite amount, heat-up time.During this period, the argon gas medium tenacity stirs, and adds the aluminium powder deoxidation to cause white slag to ladle;
C. have a power failure, the argon gas medium tenacity is stirred rear sampling thermometric a little less than stirring and turning in 3 minutes;
D. continue to electricity, according to the slag specimen situation, add aluminium, temperature is transferred to higher than out-station temperature 15-20 ℃;
E. chemical composition and temperature all meet the requirements, and proceed to quiet blowing 8 minutes; Add heat preserving agent, ladle is leaving from station;
F. out-station temperature: the first 1600 ℃ of bags, connect casting ladle times 1580 ℃
LF departures chemical composition sees the following form:
LF departures chemical composition %
(3) sheet blank continuous casting operation
A. molten steel temperature in tundish 1535-1555 ℃, ladle adopts long nozzle to add argon gas-sealed protection molten steel to tundish, avoids ladle roughing slag simultaneously;
B. tundish is used magnesium refractory, alkaline covering agent, uses aluminium matter or magnalium matter filling pipe end, stopper and submerged nozzle, and crystallizer uses basic powder;
C. pulling speed of continuous casting is 4.0-5.0m/min;
D. crystallizer and two coldly all adopts the weak type of cooling.
By the low aluminium-silicon killed steel structural carbon steel product Chemical Composition of above-mentioned explained hereafter as following table:
Finished product Chemical Composition (%)
Various embodiments of the present invention are produced continuously cast bloom surface and inner without any defect, hot-rolled sheet coil structure property and excellent surface quality.

Claims (5)

1. the technique of the calm structural carbon steel of the low aluminium silicon of a sheet blank continuous casting production, is characterized in that comprising blast-melted, converter smelting, LF refining, sheet blank continuous casting operation; Described converter smelting operation, finishing slag basicity is 3.0-3.5; Molten steel control composition mass percent C:>=0.08%, S≤0.025%, P≤0.020%; Terminal temperature: 1630-1660 ℃, terminal oxygen position :≤350ppm, finishing slag FeO mass percent≤22%, tapping time>=5 minute, deoxidation alloying; Described LF refining procedure, departures chemical composition mass percent: C: 0.18-0.22%, Mn 0.20-0.40%, S 0.008%, P 0.025%, Si≤0.12-0.25%, Als 0.0050-0.0080%, out-station temperature: 1580-1600 ℃; Described sheet blank continuous casting operation, molten steel temperature in tundish 1535-1555 ℃; It is 4.0-5.0m/min that pulling rate is controlled; Described converter smelting, LF refining and sheet blank continuous casting operation, middle Baogang water oxygen, nitrogen content total mass number are controlled as T[O]≤50ppm, [N]≤60ppm.
2. the technique of the calm structural carbon steel of aluminium silicon is hanged down in a kind of sheet blank continuous casting production according to claim 1, it is characterized in that: described converter smelting operation adopts automatically lower slag detection and slag stopping pushing off the slag, ladle top slag thickness of slag layer≤50mm; Refining slag 1.8-2.2Kg/ ton steel, lime 1.8-2.2Kg/ ton steel during tapping, adopt the ferrosilicon deoxidation, and the carburetting of employing carbon dust, high carbon ferromanganese are joined manganese, ferrosilicon is joined silicon.
3. the technique of the calm structural carbon steel of aluminium silicon is hanged down in a kind of sheet blank continuous casting production according to claim 2, it is characterized in that: during tapping molten steel 1/3, start to feed in raw material, order of addition(of ingredients) is followed successively by refining slag, lime, carbon dust, ferrosilicon, high carbon ferromanganese; Add alloy and slag making materials before tapping 3/4.
4. the technique of the calm structural carbon steel of the low aluminium silicon of a kind of sheet blank continuous casting production according to claim 1 and 2, is characterized in that: described LF refining procedure, departures chemical composition mass percent: C: 0.18-0.22%, Mn 0.20-0.40%, S 0.008%, P 0.025%, Si≤0.12-0.25%, Als 0.0050-0.0080%.
5. the technique of the calm structural carbon steel of aluminium silicon is hanged down in a kind of sheet blank continuous casting production according to claim 1 and 2; it is characterized in that: described sheet blank continuous casting operation; ladle adopts long nozzle to add argon gas-sealed protection molten steel to tundish; crystallizer uses the high alkalinity covering slag; the weak type of cooling of the cooling employing of crystallizer and secondary, guarantee that the straightening temperature is 800 ℃-1000 ℃ .
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CN105779888A (en) * 2016-03-14 2016-07-20 攀钢集团攀枝花钢铁研究院有限公司 Hot-rolling production method for carbon structural steel
CN106834610A (en) * 2017-02-07 2017-06-13 河钢股份有限公司承德分公司 A kind of high-strength micro alloyed steel multistage combination control nitrogen method
CN108300940A (en) * 2018-01-31 2018-07-20 日照钢铁控股集团有限公司 A kind of sheet blank continuous casting low cost high-mouldability low-carbon al-killed clean steel process
CN108330389A (en) * 2018-01-31 2018-07-27 日照钢铁控股集团有限公司 One kind exempting from Calcium treatment calmness clean steel production technology
CN108384922A (en) * 2018-02-09 2018-08-10 天津荣程联合钢铁集团有限公司 The smelting process of carbon constructional quality steel
CN108568503A (en) * 2018-04-27 2018-09-25 唐山钢铁集团有限责任公司 The method for accurately controlling 600MPa dual phase steel Metal in Tundish carbon contents
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
CN109536822A (en) * 2018-12-25 2019-03-29 山东钢铁股份有限公司 A kind of rigging low-carbon carbon constructional quality steel and preparation method thereof

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105543708A (en) * 2016-03-14 2016-05-04 攀钢集团攀枝花钢铁研究院有限公司 Carbon structural steel and smelting method thereof
CN105779888A (en) * 2016-03-14 2016-07-20 攀钢集团攀枝花钢铁研究院有限公司 Hot-rolling production method for carbon structural steel
CN105779888B (en) * 2016-03-14 2017-09-29 攀钢集团攀枝花钢铁研究院有限公司 A kind of hot rolling production method of carbon structural steels
CN106834610A (en) * 2017-02-07 2017-06-13 河钢股份有限公司承德分公司 A kind of high-strength micro alloyed steel multistage combination control nitrogen method
CN108300940A (en) * 2018-01-31 2018-07-20 日照钢铁控股集团有限公司 A kind of sheet blank continuous casting low cost high-mouldability low-carbon al-killed clean steel process
CN108330389A (en) * 2018-01-31 2018-07-27 日照钢铁控股集团有限公司 One kind exempting from Calcium treatment calmness clean steel production technology
CN108384922A (en) * 2018-02-09 2018-08-10 天津荣程联合钢铁集团有限公司 The smelting process of carbon constructional quality steel
CN108568503A (en) * 2018-04-27 2018-09-25 唐山钢铁集团有限责任公司 The method for accurately controlling 600MPa dual phase steel Metal in Tundish carbon contents
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
CN109536822A (en) * 2018-12-25 2019-03-29 山东钢铁股份有限公司 A kind of rigging low-carbon carbon constructional quality steel and preparation method thereof
CN109536822B (en) * 2018-12-25 2020-06-16 山东钢铁股份有限公司 Low-carbon high-quality carbon structural steel for rigging and preparation method thereof

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