CN108300940A - A kind of sheet blank continuous casting low cost high-mouldability low-carbon al-killed clean steel process - Google Patents

A kind of sheet blank continuous casting low cost high-mouldability low-carbon al-killed clean steel process Download PDF

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CN108300940A
CN108300940A CN201810096131.2A CN201810096131A CN108300940A CN 108300940 A CN108300940 A CN 108300940A CN 201810096131 A CN201810096131 A CN 201810096131A CN 108300940 A CN108300940 A CN 108300940A
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steel
molten steel
continuous casting
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CN108300940B (en
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乔继纲
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Rizhao Steel Holding Group Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • C21C7/0006—Adding metallic additives
    • 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
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • 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
    • C21C7/072—Treatment with gases
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention discloses a kind of sheet blank continuous casting low costs to produce high-mouldability low-carbon al-killed clean steel process, belongs to technical field of ferrous metallurgy, it is characterised in that：The technological process of molten iron → oxygen top and bottom combined blown converter → LF refining → ladle bottom argon gas soft blow → continuous casting → tandem rolling.Compared with prior art, Calcium treatment technique is not used, eliminates Calcium treatment cost, is avoided the problem of wadding stream easily occurs for high-melting-point aluminate, is improved the processability of steel plate, reduces cold bend cracking occurrence probability.

Description

A kind of sheet blank continuous casting low cost high-mouldability low-carbon al-killed clean steel process
Technical field
The present invention relates to technical field of ferrous metallurgy, more particularly to sheet blank continuous casting low cost produces high-mouldability low-carbon aluminium The production technology of calm clean steel.
Background technology
Sheet blank continuous casting refers to thickness of strand in 70~120mm, short route hot coil of strip of the pulling speed of continuous casting in 3-6m/min Production technology.Its typical production steel grade is low-carbon (siliceous or control silicon) aluminum killed steel.
Sheet billet produces low-carbon (siliceous or control silicon) aluminum killed steel, and production technology generally uses molten iron → oxygen top bottom multiple Blow converter → LF refining → ladle bottom argon gas soft blow → Calcium treatment → ladle bottom argon gas soft blow → sheet blank continuous casting → tandem rolling Technological process.Wherein Calcium treatment technique is specially：Molten steel feeds calcium metal solid core core-spun yarn, its object is to：Control is suitable Calcium aluminium ratio, generate low melting point liquid 12CaO7Al2O3、3CaO·Al2O3Aluminate promotes inclusion floating, improves molten steel Castability.
But in actual production, using above-mentioned Calcium treatment technique, the recovery rate of calcium is often 20% or so, under smelting temperature Most of calcium remains in metal bath following (1) oxide of the form that is primarily present and is mingled with, and solid-state calcium-aluminate is (C.6A, C.2A, C.A)；(2) CaS is mingled in molten steel, and the existence form of these calcium easily causes nozzle blocking, influences and limitation sheet blank continuous casting is given birth to Produce efficiency；Also, high-melting-point calcium aluminate field trash in molten steel, affects the processability of steel plate, cold bend cracking easily occurs.
Therefore, it is different from the Calcium treatment technology of existing sheet billet production low-carbon (siliceous or control silicon) aluminum killed steel, is being controlled The amount of inclusions improves pourability of molten steel, mitigates on wadding flow problem, in addition can not also use Calcium treatment technique, can also On thin-slab caster, the production technology of production low-carbon (siliceous or control silicon) al-killed clean steel.
Invention content
The technical assignment of the present invention is to be directed to the above the deficiencies in the prior art, it is proposed that a kind of sheet blank continuous casting low cost life Produce the production technology of high-mouldability low-carbon al-killed clean steel.The present invention does not use Calcium treatment technique, but still can expire completely Sufficient continuous casting steel castability requirement, and because high-melting-point calcium aluminate the amount of inclusions is few, steel plate forming performance is improved.
The present invention the technical solution to solve the technical problem is that：A kind of sheet blank continuous casting low cost production high-mouldability low-carbon Al-killed clean steel process, which is characterized in that production technology includes the following steps：
(1) molten steel sulfur content is reduced to 0.02% or less by molten iron pretreatment；
(2) oxygen top and bottom combined blown converter：Control converter terminal molten steel [O] ＜ 600ppm；
(3) LF refining：Refine the molten steel [Al] 0.015~0.050% that enters the station, liquid steel temperature >=1550 DEG C；Control slag composition For：CaO 54~60%；Al2O325~30%；SiO26~9%；MgO 5~7%, basicity CaO/SiO2Numerical value is 6~9； White slag is made in refining；Molten steel aluminium component adjusts, and matches aluminium number≤3 time；The mass percent of molten steel composition controls：C：0.038~ 0.045%, Si：0.15~0.25%, Mn：0.50~0.60%, P≤0.015%, S≤0.003%, Alt：0.008~ 0.020%, surplus is iron and micro inevitable impurity；
(4) ladle bottom argon gas soft blow：The soft blow calmness time is 20~30 minutes；
(5) continuous casting：Dissolved aluminum controls≤0.002% with total aluminium difference, 3~6m/min of pulling rate；
(6) steel rolling.
Wherein：
In step (4), ladle uses two gas supply bricks, air blowing intensity to be subject to not exposed molten steel, and refine it is outbound after bottom blowing Cooling must not be stirred greatly.
In step (5), continuous casting use the whole immersion type mouth of a river, in unwrap pour argon gas purging, the double-deck coverture, the long water of ladle Mouth molding casting, the whole immersion type mouth of a river, company pour molten steel and pass through argon for protecting pouring.
The above-mentioned double-deck coverture is lower part alkalinity, and top is acid.
Compared with prior art, the present invention has advantageous effect following prominent：
1, the present invention does not use Calcium treatment technique, eliminates Calcium treatment cost, and avoid high-melting-point aluminate and easily send out The problem of raw wadding stream, the processability of steel plate is improved, reduces cold bend cracking occurrence probability；
It 2, can be to avoid nitrogen pick-up problem caused by Calcium treatment technique using the technology of the present invention；
3, the technology of the present invention reduces processing step, simplifies technological process, can control and reduce completely field trash number Amount meets continuous casting steel Cleanliness of Molten Steel and castability requirement, and inclusion floating, adsorption effect are apparent, product composition qualification rate Reach 99.3%；
4, using the technology of the present invention, Calcium treatment cost is eliminated, ton steel saves about 4.1 yuan/ton of cost, and profit is promoted for enterprise Moisten space.
Description of the drawings
Fig. 1 is the stick plug erosion figure of comparative example 1.
Fig. 2 is the stick plug erosion figure of embodiment 1.
Fig. 3 is the field trash scanning electron microscopic picture of comparative example 1.
Fig. 4 is the field trash scanning electron microscopic picture of embodiment 1.
Fig. 5 is the field trash scanning electron microscopic picture of embodiment 2.
Fig. 6 is the field trash scanning electron microscopic picture of embodiment 4.
Specific implementation mode
Sheet blank continuous casting low-carbon (siliceous) al-killed clean steel of the present invention is given birth to reference to comparative example, specific embodiment Production technology is described in further details.It is the production process of steel grade H06201 below.
Comparative example 1：For existing Calcium treatment technique, technology path is：Molten iron → oxygen top and bottom combined blown converter → LF refining → Ladle bottom argon gas soft blow → Calcium treatment → ladle bottom argon gas soft blow → continuous casting → steel rolling.
(1) molten iron：Molten steel sulfur content is reduced to 0.02% or less by modes such as molten iron pretreatments；
(2) converter smelting：Just refining, oxygen top and bottom combined blown converter are carried out to molten iron in converter.Wherein use sub-lance technique, BOTTOM ARGON BLOWING technology controls converter terminal molten steel [O] ＜ 700ppm, slag-stopping tapping.
(3) LF refining：Ladle refining is carried out after tapping, aluminium deoxidizer, alloy, quick lime adjustment molten steel component is added, then Argon station Argon deoxygenation refining；Deoxidation terminates, adjustment argon gas to soft blow state, argon flow amount 30m3/ h, soft blow time 8min.Molten steel The mass percent of ingredient controls：C：0.038~0.045%, Si：0.15~0.25%, Mn：0.50~0.60%, P≤ 0.018%, S≤0.003%, Alt：0.008~0.020%, surplus is iron and micro inevitable impurity.
(4) Calcium treatment：BOTTOM ARGON BLOWING flow is adjusted to 30m3/ h feeds seamless gold using wire feeder with 2~2.5m/s speed Belong to calcium line 400~600m/ stoves, to reach Ca in molten steel composition：0.0010~0.0040%；
(5) soft blow of ladle bottom argon gas is calm：Argon gas is adjusted after Calcium treatment to soft blow state, soft blow time 8min, Argon flow amount 30m3/h。
(6) continuous casting：Steel stream is controlled using aluminium carbon integrated filler rod, ladle to tundish uses long nozzle protective casting, aluminium Submersed nozzle outside carbonaceous, 3~6m/min of pulling rate.
(7) steel rolling.
Process above process is existing sheet blank continuous casting production technology, and specific step is not repeated.The aluminium is de- Oxygen agent, alloy, quick lime addition are executed in accordance with steel grade manufacturer's standard.
Comparative example 2：To remove Calcium treatment step in comparative example 1, pre-designed processing technology routine is：Molten iron → oxygen top bottom Combined blown converter → LF refining → ladle bottom argon gas soft blow → sheet blank continuous casting → tandem rolling.
It removes other than Calcium treatment step, items processing step therein and parameter are identical as comparative example 1.
Embodiment 1
(1) molten iron：Molten steel sulfur content is reduced to 0.02% or less by modes such as molten iron pretreatments；
(2) oxygen top and bottom combined blown converter：Using sub-lance technique, BOTTOM ARGON BLOWING technology, converter terminal molten steel [O] ＜ is controlled 600ppm, slag-stopping tapping；Converter terminal molten steel [O] ＜ 600ppm are controlled, the addition of deoxidized aluminium is reduced, reduce Al2O3Deoxidation is pressed from both sides Sundries total amount.
(3) LF refining：Refine molten steel [Al] 0.020-0.03% that enters the station, liquid steel temperature >=1550 DEG C；Add by 6~7Kg/ tons Enter lime, control slag group becomes CaO 55~60%；Al2O325~30%；SiO27~8%；MgO 5~7%, basicity CaO/ SiO2Numerical value is 7~8；White slag is made in refining；Molten steel aluminium component adjusts, and stringent control is less than 3 times with aluminium number, and the present embodiment is specific For twice；The mass percent of molten steel composition controls：C：0.038~0.045%, Si：0.15~0.25%, Mn：0.50~ 0.60%, P≤0.015%, S≤0.003%, Alt：0.008~0.020%, surplus is iron and micro inevitable miscellaneous Matter.Enter the station molten steel aluminium content and temperature are controlled, is convenient for refining to make white slag, the purpose of steady production rhythm to reach；Slag former control Alkaline degree makes the existing good deoxidation of clinker, desulphurizing ability and absorption alundum (Al2O3) be mingled with ability in the range of 7~8, matches Aluminium number is less than 3, concentrates deoxidation, is conducive to field trash aggregation and floats, and often with aluminium, more to the later stage, oxygen concentration is lower in molten steel, It forms alundum (Al2O3) and is mingled with more disperse, be then unfavorable for being mingled with floating.Con casting ladle to middle packet molding casting and in wrap to knot Brilliant device molding casting is control nitrogen important link.
(4) soft blow of ladle bottom argon gas, calmness：Ladle uses two gas supply bricks, air blowing intensity to be subject to not exposed molten steel, soft It blows, the calm 22 minutes time；And the outbound rear bottom blowing of refining must not stir greatly cooling.So that alundum (Al2O3) is mingled with abundant floating, purifies Molten steel.
(5) continuous casting：Using the whole immersion type mouth of a river, ladle roughing slag detects automatically.In unwrap pour argon gas purging, bilayer covering Agent (lower part alkalinity, top are acid), ladle long nozzle molding casting, the whole immersion type mouth of a river (zirconium oxide liner) is high-purity magnesia Stopper, mold liquid level are controlled automatically, electromagnetic braking, ladle roughing slag detection；Molten steel pours by argon for protecting pouring in company, dissolved aluminum with Total aluminium difference control≤0.002%, 3~6m/min of pulling rate；Con casting ladle to middle packet molding casting and in wrap to crystallizer protect Shield cast is all control nitrogen important link.
(6) steel rolling.
For emphasis of the present invention in the cleaner production technology of molten steel, steel rolling process is identical, is not related to steel rolling process more The part for changing, therefore not addressed in embodiment is the prior art, according to the technique and parameter manipulation of the prior art.
Embodiment 2
(1) molten iron：Molten steel sulfur content is reduced to 0.02% or less by modes such as molten iron pretreatments；
(2) oxygen top and bottom combined blown converter：Using sub-lance technique, BOTTOM ARGON BLOWING technology, converter terminal molten steel [O] ＜ is controlled 600ppm, slag-stopping tapping and pre-deoxidation, pushing off the slag so that the total content into the FeO and MnO of ladle is into the molten steel in ladle Amount 5~7% (weight), into molten steel ferro-aluminum magnesium compound deoxidant is added carries out pre-deoxidation, and in ladle after tapping Molten steel carry out once feed aluminium so that argon station molten steel [O] ＜ 200ppm, reduce refinement and deoxidation aluminium addition, reduce Al2O3It is de- Oxygen field trash total amount.
(3) LF refining：Refine the molten steel [Al] 0.035~0.050% that enters the station, 1550~1650 DEG C of liquid steel temperature；By 6~ 7Kg/ tons of addition lime, control slag group become CaO 54~58%；Al2O326~28%；SiO27~8%；MgO 5~6%, Basicity CaO/SiO2Numerical value 6~8；White slag is made in refining；Molten steel aluminium component adjusts, and carries out 3 times and feeds aluminium, feeds ferro-aluminum rare earth cored Line；It is 0.15~0.25% to make molten steel silicone content；Refine outbound molten steel composition mass percent control be：C：0.038~ 0.045%, Si：0.15~0.25%, Mn：0.50~0.60%, P≤0.015%, S≤0.003%, Alt：0.008~ 0.020%, surplus is iron and micro inevitable impurity.The present embodiment has carried out pre-deoxidation design, and the molten steel aluminium that enters the station contains Amount is higher than embodiment 1, and in refining process, basicity of slag has carried out corresponding adjustment.
(4) soft blow of ladle bottom argon gas, calmness：Ladle uses two gas supply bricks, air blowing intensity to be subject to not exposed molten steel, soft It blows, the calm 20 minutes time；And the outbound rear bottom blowing of refining must not stir greatly cooling.So that alundum (Al2O3) is mingled with abundant floating, purifies Molten steel.
(5) continuous casting：Using the whole immersion type mouth of a river, ladle roughing slag detects automatically.In unwrap pour argon gas purging, bilayer covering Agent (lower part alkalinity, top are acid), ladle long nozzle molding casting, the whole immersion type mouth of a river (zirconium oxide liner) is high-purity magnesia Stopper, mold liquid level are controlled automatically, electromagnetic braking, ladle roughing slag detection；Molten steel pours by argon for protecting pouring in company, dissolved aluminum with Total aluminium difference control≤0.002%, 3~6m/min of pulling rate.
(6) steel rolling.
Embodiment 3
(1) molten iron：Molten steel sulfur content is reduced to 0.02% or less by modes such as molten iron pretreatments；
(2) oxygen top and bottom combined blown converter：Using sub-lance technique, BOTTOM ARGON BLOWING technology, converter terminal molten steel [O] ＜ is controlled 550ppm, slag-stopping tapping, ton slag 3~4Kg of amount under pushing off the slag process control, converter terminal molten steel [O] ＜ 550ppm reduce deoxidation The addition of aluminium reduces Al2O3Deoxidation type inclusion total amount.
(3) LF refining：Adjustment refines the molten steel [Al] 0.02~0.04% that enters the station, liquid steel temperature >=1550 DEG C；By 6~7Kg/ Lime is added in ton, and control slag group becomes CaO 54~56%, Al2O325~30%；SiO26~7%；MgO 5~7%, basicity CaO/SiO2Numerical value 8~9；White slag is made in refining；Molten steel aluminium component adjusts, and matches aluminium number 2 times, feeds 400 meters of lime stone core-spun yarn；Steel Water silicon content is 0.15~0.25%；Refine outbound molten steel composition mass percent control be：C：0.038~0.045%, Si：0.15~0.25%, Mn：0.50~0.60%, P≤0.015%, S≤0.003%, Alt：0.008~0.020%, surplus For iron and micro inevitable impurity.The molten steel acid-soluble aluminum content that enters the station is adjusted, it is made to embody strong deoxidation nitrogen fixing capacity, it can Match aluminium number in the process to reduce LF refining, improves refining desulfuration efficiency；The liquid steel temperature that enters the station is controlled, is convenient for refining to make to reach White slag, the purpose of steady production rhythm.
(4) soft blow of ladle bottom argon gas, calmness：Ladle uses two gas supply bricks, air blowing intensity to be subject to not exposed molten steel, soft It blows, the calm 30 minutes time；And the outbound rear bottom blowing of refining must not stir greatly cooling.So that alundum (Al2O3) is mingled with abundant floating, purifies Molten steel.
(5) continuous casting：Using the whole immersion type mouth of a river, ladle roughing slag detects automatically.In unwrap pour argon gas purging, bilayer covering Agent (lower part alkalinity, top are acid), ladle long nozzle molding casting, the whole immersion type mouth of a river (zirconium oxide liner) is high-purity magnesia Stopper, mold liquid level are controlled automatically, electromagnetic braking, ladle roughing slag detection；Molten steel pours by argon for protecting pouring in company, dissolved aluminum with Total aluminium difference control≤0.002%, 3~6m/min of pulling rate；
(6) steel rolling.
Wherein the lime stone core-spun yarn, principle are：Ladle feeds lime stone core-spun yarn, main component in lime stone Calcium carbonate, by heat resolve, generates calcium oxide and carbon dioxide, reaction equation in molten steel：
CaCO3=(CaO)+CO2↑
Newly-generated calcium oxide contributes to further desulfurization that can help desulfurization, reaction equation：
[FeS]+(CaO)=(CaS)+[FeO]
The CaO of generation, at high temperature with Al in molten steel2O3Equal field trashes combine aggregation, reaction equation：
(CaO)+(Al2O3)=Ca (AlO2)2
Original field trash and the new field trash for combining generation, the CO that Collision coagulation is generated with reaction in molten steel2Bubble Liquid steel level is floated to together, is mingled with and the cleaning molten steel that floats to play the role of absorption.Continuous casting sprue wadding stream is prevented, is helped In inexpensive production economy clean steel.
The lime stone core-spun yarn The concrete specification can be：Linear diameter：10mm+0.5mm；Thickness of scale：1.5mm+/- 0.2mm；Powder weight：80g/m+/- 5%；Iron sheet weight：360g/m+/- 5%.
The lime stone core-spun yarn physical and chemical index is：
8.7 yuan/ton of Calcium treatment cost, lime stone core-spun yarn reduce by 70% cost than it, are calculated by 5,000,000 tons of steel are produced per year： Year cost-effective=ten thousand yuan of 500 × 8.7 × 70%=3045.
Examples 1 to 3 (H06201) is prepared for low-carbon (siliceous) aluminum killed steel.The method of the present invention is equally applicable to low-carbon Prepared by (control silicon) aluminum killed steel, be below low-carbon (control silicon) aluminum killed steel (H01301).
Comparative example 3：For existing Calcium treatment technique, technology path is：Molten iron → oxygen top and bottom combined blown converter → LF refining → Ladle bottom argon gas soft blow → Calcium treatment → ladle bottom argon gas soft blow → continuous casting → steel rolling.
(1) molten iron：Molten steel sulfur content is reduced to 0.02% or less by modes such as molten iron pretreatments；
(2) converter smelting：Just refining, oxygen top and bottom combined blown converter are carried out to molten iron in converter.Wherein use sub-lance technique, BOTTOM ARGON BLOWING technology controls converter terminal molten steel [O] ＜ 600ppm, slag-stopping tapping.
(3) LF refining：Ladle refining is carried out after tapping, aluminium deoxidizer, alloy, quick lime adjustment molten steel component is added, then Argon station Argon deoxygenation refining；Deoxidation terminates, adjustment argon gas to soft blow state, argon flow amount 30m3/ h, soft blow time 8min.Molten steel The mass percent of ingredient controls：C：0.038~0.045%, Si：0.025~0.035%, Mn：0.08~0.20%, P≤ 0.015%, S≤0.003%, Alt：0.015~0.040%, surplus is iron and micro inevitable impurity.
(4) Calcium treatment：BOTTOM ARGON BLOWING flow is adjusted to 30m3/ h feeds seamless gold using wire feeder with 2~2.5m/s speed Belong to calcium line 400~600m/ stoves, to reach Ca in molten steel composition：0.0010~0.0040%；
(5) soft blow of ladle bottom argon gas is calm：Argon gas is adjusted after Calcium treatment to soft blow state, soft blow time 8min, Argon flow amount 30m3/h。
(6) continuous casting：Steel stream is controlled using aluminium carbon integrated filler rod, ladle to tundish uses long nozzle protective casting, aluminium Submersed nozzle outside carbonaceous, 3~6m/min of pulling rate.
(7) steel rolling.
Embodiment 4
(1) molten iron：Molten steel sulfur content is reduced to 0.02% or less by modes such as molten iron pretreatments；
(2) oxygen top and bottom combined blown converter：Using sub-lance technique, BOTTOM ARGON BLOWING technology, converter terminal molten steel [O] ＜ is controlled 600ppm, slag-stopping tapping, converter terminal molten steel [O] ＜ 600ppm reduce the addition of deoxidized aluminium, reduce Al2O3Deoxidation type inclusion Total amount.
(3) LF refining：Adjustment refines the molten steel [Al] 0.030~0.060% that enters the station, liquid steel temperature >=1550 DEG C；By 8~ 12Kg/ tons of addition lime, control slag group become CaO 55~60%, Al2O335~40%；SiO23~4%；MgO 5~ 7%, basicity CaO/SiO2Numerical value 20~26；White slag is made in refining；Molten steel aluminium component adjusts, and matches aluminium number 2 times；Feed lime stone cored 500 meters of line (specification such as embodiment 3)；Molten steel silicone content is 0.025~0.035%；Refine the quality percentage of outbound molten steel composition It is than control：C：0.038~0.045%, Si：0.025~0.035%, Mn：0.08~0.20%, P≤0.015%, S≤ 0.003%, Alt：0.015~0.040%, surplus is iron and micro inevitable impurity.
(4) soft blow of ladle bottom argon gas, calmness：Ladle uses two gas supply bricks, air blowing intensity to be subject to not exposed molten steel, soft It blows, the calm 24 minutes time；And the outbound rear bottom blowing of refining must not stir greatly cooling.So that alundum (Al2O3) is mingled with abundant floating, purifies Molten steel.
(5) continuous casting：Using the whole immersion type mouth of a river, ladle roughing slag detects automatically.In unwrap pour argon gas purging, bilayer covering Agent (lower part alkalinity, top are acid), ladle long nozzle molding casting, the whole immersion type mouth of a river (zirconium oxide liner) is high-purity magnesia Stopper, mold liquid level are controlled automatically, electromagnetic braking, ladle roughing slag detection；Molten steel pours by argon for protecting pouring in company, dissolved aluminum with Total aluminium difference control≤0.002%, 3~6m/min of pulling rate；
(6) steel rolling.
Embodiment 5
(1) molten iron：Molten steel sulfur content is reduced to 0.02% or less by modes such as molten iron pretreatments；
(2) oxygen top and bottom combined blown converter：Using sub-lance technique, BOTTOM ARGON BLOWING technology, converter terminal molten steel [O] ＜ is controlled 550ppm, slag-stopping tapping, ton slag 3~4Kg of amount under pushing off the slag process control, converter terminal molten steel [O] ＜ 550ppm reduce deoxidation The addition of aluminium reduces Al2O3Deoxidation type inclusion total amount.
(3) LF refining：Adjustment refines the molten steel [Al] 0.04~0.06% that enters the station, liquid steel temperature >=1550 DEG C；By 9Kg/ tons Lime is added, control slag group becomes CaO 57~60%, Al2O335~40%；SiO22~3.5%；MgO 5~7%, basicity CaO/SiO2Numerical value 22~25；White slag is made in refining；Molten steel aluminium component adjusts, and matches aluminium number 2 times；Molten steel silicone content be 0.025~ 0.035%；Refine outbound molten steel composition mass percent control be：C：0.038~0.045%, Si：0.025~ 0.035%, Mn：0.08~0.20%, P≤0.015%, S≤0.003%, Alt：0.015~0.040%, surplus is iron and micro- The inevitable impurity of amount.The molten steel acid-soluble aluminum content that enters the station is adjusted, so that it is embodied strong deoxidation nitrogen fixing capacity, LF can be reduced Match aluminium number in refining process, improves refining desulfuration efficiency；The liquid steel temperature that enters the station is controlled, is convenient for refining to make white slag to reach, surely Determine the purpose of rhythm of production.
(4) soft blow of ladle bottom argon gas, calmness：Ladle uses two gas supply bricks, air blowing intensity to be subject to not exposed molten steel, soft It blows, the calm 28 minutes time；And the outbound rear bottom blowing of refining must not stir greatly cooling.So that alundum (Al2O3) is mingled with abundant floating, purifies Molten steel.
(5) continuous casting：Using the whole immersion type mouth of a river, ladle roughing slag detects automatically.In unwrap pour argon gas purging, bilayer covering Agent (lower part alkalinity, top are acid), ladle long nozzle molding casting, the whole immersion type mouth of a river (zirconium oxide liner) is high-purity magnesia Stopper, mold liquid level are controlled automatically, electromagnetic braking, ladle roughing slag detection；Molten steel pours by argon for protecting pouring in company, dissolved aluminum with Total aluminium difference control≤0.002%, 3~6m/min of pulling rate；
(6) steel rolling.
The present invention reaches clean steel productive target by optimization technological process, and do not occur wadding a quilt with cotton in molten steel casting process and flow, Water blockoff lip reflex, stick position are stablized.Each comparative example and embodiment compare, as a result as follows：
1, a situation arises compares for wadding stream
Whether molten steel can occur wadding stream, and whether crucial field trash can really float.Comparative example 1 is prior art calcium Molten steel is handled, the original technical purpose of Calcium treatment is：Suitable calcium aluminium ratio is controlled, low melting point liquid 12CaO is generated 7Al2O3、3CaO·Al2O3Aluminate promotes inclusion floating.But in fact, since calcium is very active, it is easy to aoxidize, such as calcium Composition Control is improper, excessive or very few, will generate solid oxide calcium or solid-state calcium-aluminate, does not have and generates low melting point calcium aluminium The purpose of hydrochlorate；The hair for causing floating field trash insufficient, not only wasting the cost of Calcium treatment, and wadding can not be avoided to flow It is raw.
The technology of the present invention passes through：Aluminium component and temperature, slag composition and alkali 1. control converter terminal oxygen content, refining enter the station Degree；2. controlling bottom blowing agitation；3. aluminium number is matched in control；4. increasing bottom blowing air permeability by improveing air brick；5. with economical cheap Lime stone core-spun yarn overcome existing skill instead of more expensive solid core calcium core-spun yarn to promote effective inclusion floating Inclusion floating has to rely on the technology prejudice of Calcium treatment in art.
Each group wadding stream incidence：Comparative example 1 is 1.05%；Seriously wadding stream, the mouth of a river block comparative example 2, technique failure；Comparison Example 3 is 0.96%；Embodiment 1 is 0.08%；Embodiment 2 is 0.09%；Embodiment 3 is 0.07%；Embodiment 4 is 0.07%； Embodiment 5 is 0.08%.
The result shows that the technology of the present invention technique and the comparative example of prior art Calcium treatment 1,3, the two is in wadding stream incidence Difference do not have statistical significance (P>0.05), and merely for data, the embodiment 3,4 of the technology of the present invention technique (is fed Lime stone core-spun yarn) comparative example 1~3 of the stream incidence of wadding a quilt with cotton significantly lower than prior art Calcium treatment.And the technology of the present invention technique and Comparative example results contrast, the then as can be seen that technical validity of the technology of the present invention technique is in processing step that links change Good combination, rather than it is only in that simple removal Calcium treatment step.
2, finished product composition of steel comparison such as following table：2 preparation process of comparative example fails, since serious wadding flows, nozzle blocking, Cause its preparation that can not carry out, therefore finished product shortage of data.
Low-carbon (siliceous) aluminum killed steel (H06201)
Element % C Si Mn P S Alt Ca
Comparative example 1 0.04424 0.19344 0.52386 0.0136 0.00077 0.01329 0.00145
Embodiment 1 0.04357 0.18208 0.53512 0.01761 0.00105 0.01461 —
Embodiment 2 0.04229 0.18776 0.53521 0.01751 0.00051 0.01289 —
Embodiment 3 0.0416 0.18239 0.53709 0.01736 0.00181 0.01553 —
Low-carbon (control silicon) aluminum killed steel (H01301)
Element % C Si Mn P S Alt Ca
Comparative example 3 0.038420 0.031520 0.108960 0.013360 0.000420 0.031240 0.002140
Embodiment 4 0.038820 0.032850 0.092220 0.011880 0.001810 0.030890 —
Embodiment 5 0.038280 0.033870 0.095400 0.009540 0.000880 0.030070 —
Compared by upper table ingredient it can be found that using non-calcium treatment process Examples 1 to 3 low-carbon (siliceous) al-killed Steel, 4~5 low-carbon of embodiment (control silicon) aluminum killed steel stable components.
3, finished product material physicochemical property compares：2 preparation process of comparative example fails, since serious wadding flows, nozzle blocking, Cause its preparation that can not carry out, therefore finished product shortage of data.
Low-carbon (siliceous) aluminum killed steel (H06201)
Low-carbon (control silicon) aluminum killed steel (H01301)
Examples comparative Specification mm Yield strength MPA Tensile strength MPA Elongation percentage % R values
Test stone ≤330 270-420 ≥32.0
Comparative example 3 2.00×1500 295 375 39.5 0.79
Embodiment 4 2.00×1500 291 371 42.1 0.78
Embodiment 5 2.00×1500 298 371 41.0 0.80
The non-calcium treated steel of comparative example 1,3 calcium treated steels and Examples 1 to 5, mechanical property all meet steel grade and examine mark Standard, the non-calcium treated steel obtained by Examples 1 to 5, elongation percentage are less than comparative example higher than comparative example 1,3 process steel, r values 1、3.The processability of elongation percentage, r values (ratio of yield strength/tensile strength) reflection steel, theoretically r values are smaller, then mould Property deformation it is better, machine-shaping property is better.Illustrate technical scheme of the present invention, using hot rolling made of non-calcium treatment process Plate, machine-shaping property are better than Calcium treatment technique steel.This is because high-melting-point calcium aluminate field trash in the treatment process molten steel, The processability for affecting steel plate, easily occurs cold bend cracking.
4, stopper erosion condition compares
Fig. 1 is that the stick plug of comparative example 1 corrodes figure.It can be seen that Calcium treatment molten steel, calcium and the Al in the resistance to material of stopper2O3It generates Low melting point aluminate makes stopper head obvious erosion groove occur.This is because occur in molten steel following reaction [Ca]+[O]= CaO, 12CaO+7Al2O3=12CaO7Al2O3, [Ca] is reacted with [O] in molten steel generates CaO, CaO again in the resistance to material of stopper Al2O3Generate low melting point 12CaO7Al2O3, solid-state stopper is made constantly to dissolve erosion.When stopper erosion is serious, molten steel can be made to note Stream is unstable, and mold liquid level is unstable, causes wadding stream, slag etc., the even productions such as bleed-out, quality accidents.
Fig. 2 is that the stick plug of embodiment 1 corrodes figure.Non- calcium treated steel stopper erosion topography, stopper head is relatively round and smooth, corrodes Degree is opposite to be mitigated.Because of not calcic, low melting point aluminate cannot be generated, so erosion degree is light.Cast is stablized, and avoids wadding a quilt with cotton The productions such as stream, slag, bleed-out, quality accidents.
5, hot rolling plate sampling field trash electron-microscope scanning result is as follows：
(1) composition of inclusions compares
It can be found by the comparison of upper table composition of inclusions, composition of inclusions is mainly aluminium oxide folder under non-calcium treatment process Miscellaneous, the product of Calcium treatment technique is mingled with complicated component, mainly high-melting-point calcium-aluminate, such is mingled with easy large area aggregation, makes It wads a quilt with cotton and flows at continuous casting machine, influence to produce, increase production cost.
(2) scanning electron microscopic picture：
Fig. 3~Fig. 6 is respectively：Comparative example 1, embodiment 1, embodiment 2, the field trash scanning electron microscopic picture of embodiment 4 are led to Comparison is crossed it can be found that embodiment 1,2,4 is close with 1 inclusion size of comparative example, comparative example 1 is predominantly subsphaeroidal in shape, real Example 1,2,4 is applied with irregular shape, since comparative example 1 is that high-melting-point calcium-aluminate in being mingled with after Calcium treatment technique is easily assembled It is mingled with influence slab quality as large scale, finally influences steel quality, steel qualification rate is caused to decline.
6, cost compares
Each embodiment group (siliceous/control silicon) using technical solution of the present invention and the Calcium treatment work that is compared with the prior art example Skill is compared, and step is simplified, and saves Calcium treatment cost, and pourability of molten steel, ingredient, performance all meet standard requirement, cost compared with Same level steel grade reduces by 4.1 yuan/ton.
The cheap lime stone core-spun yarn of use cost replaces more expensive calcium solid core core-spun yarn, reduces production cost, steel Water castability, ingredient, performance all meet standard requirement, and cost reduces by 8.7 × 70%=6.09 yuan/ton compared with same level steel grade.
It should be noted that the present invention particular embodiment to the present invention have been described in detail, for ability For the technical staff in domain, its various of progress is obviously changed without departing from the spirit and scope of the present invention Become all within protection scope of the present invention.

Claims (4)

1. a kind of sheet blank continuous casting low cost produces high-mouldability low-carbon al-killed clean steel process, which is characterized in that production work Skill includes the following steps：
(1) molten steel sulfur content is reduced to 0.02% or less by molten iron pretreatment；
(2) oxygen top and bottom combined blown converter：Control converter terminal molten steel [O] ＜ 600ppm；
(3) LF refining：Refine the molten steel [Al] 0.015~0.050% that enters the station, liquid steel temperature >=1550 DEG C；Control slag group becomes： CaO 54~60%；Al2O325~30%；SiO26~9%；MgO 5~7%, basicity CaO/SiO2Numerical value is 6~9；Refining Make white slag；Molten steel aluminium component adjusts, and matches aluminium number≤3 time；The mass percent of molten steel composition controls：C：0.038~ 0.045%, Si：0.15~0.25%, Mn：0.50~0.60%, P≤0.015%, S≤0.003%, Alt：0.008~ 0.020%, surplus is iron and micro inevitable impurity；
(4) ladle bottom argon gas soft blow：The soft blow calmness time is 20~30 minutes；
(5) continuous casting：Dissolved aluminum controls≤0.002% with total aluminium difference, 3~6m/min of pulling rate；
(6) steel rolling.
2. sheet blank continuous casting low cost according to claim 1 produces high-mouldability low-carbon al-killed clean steel process, It is characterized in that：In the step (4), ladle uses two gas supply bricks, air blowing intensity to be subject to not exposed molten steel, and refine it is outbound after Bottom blowing must not stir greatly cooling.
3. sheet blank continuous casting low cost according to claim 1 produces high-mouldability low-carbon al-killed clean steel process, It is characterized in that：In the step (5), continuous casting use the whole immersion type mouth of a river, in unwrap pour argon gas purging, the double-deck coverture, steel Packet long nozzle molding casting, the whole immersion type mouth of a river, company pour molten steel and pass through argon for protecting pouring.
4. sheet blank continuous casting low cost according to claim 1 produces high-mouldability low-carbon al-killed clean steel process, It is characterized in that：The double-deck coverture is lower part alkalinity, and top is acid.
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Denomination of invention: Thin slab continuous casting low cost high formability low carbon aluminum killed clean steel process

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