CN109852891A - A kind of low-carbon boron-containing steel continuous casting steel billet corner crack control method - Google Patents
A kind of low-carbon boron-containing steel continuous casting steel billet corner crack control method Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 145
- 239000010959 steel Substances 0.000 title claims abstract description 145
- 238000000034 method Methods 0.000 title claims abstract description 95
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 229910052796 boron Inorganic materials 0.000 title claims abstract description 56
- 238000009749 continuous casting Methods 0.000 title claims abstract description 56
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 40
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 102
- 229910052786 argon Inorganic materials 0.000 claims abstract description 51
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000007664 blowing Methods 0.000 claims abstract description 29
- 238000007670 refining Methods 0.000 claims abstract description 26
- 238000010079 rubber tapping Methods 0.000 claims abstract description 22
- 239000007789 gas Substances 0.000 claims abstract description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 16
- 238000003723 Smelting Methods 0.000 claims abstract description 14
- 208000029154 Narrow face Diseases 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000005275 alloying Methods 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims abstract description 5
- 238000009628 steelmaking Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 81
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 11
- 239000001301 oxygen Substances 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- 239000000654 additive Substances 0.000 claims description 9
- 230000000996 additive effect Effects 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 239000004615 ingredient Substances 0.000 claims description 5
- 238000005266 casting Methods 0.000 description 12
- 239000013078 crystal Substances 0.000 description 7
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- 239000011572 manganese Substances 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 5
- 208000037656 Respiratory Sounds Diseases 0.000 description 4
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- 230000007547 defect Effects 0.000 description 4
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- 239000002893 slag Substances 0.000 description 3
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- LAUCTMALVHLLAL-UHFFFAOYSA-N [Mn].[C].[Fe] Chemical compound [Mn].[C].[Fe] LAUCTMALVHLLAL-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
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Abstract
The present invention relates to a kind of low-carbon boron-containing steel continuous casting steel billet corner crack control methods.The method comprise the steps that (1) Composition Control；(2) in the hot metal ratio control of converter steelmaking process 85.0%~87.0%, whole process uses bottom blowing mode, and one rifle of blowing argon gas blows on earth after converting process elder generation nitrogen blowing, and nitrogen and argon gas use ratio are 1:9；(3) for the control of smelting endpoint C content 0.035 ± 0.02, tapping temperature is 1660 ± 5 DEG C；(4) converter smelting tapping process is tapped using semi deoxidized technique；(5) tapping process carries out deoxidier and alloying simultaneously；(6) after having gone out steel, ladle is directly transferred to argon station and carries out ar blowing refining；(7) in continuous casting process, in the wide of continuous casting billet, narrow-face foot roller area, two to four area of vertical curved segment, 1 section of segmental arc using strong cooling control, and 2~8 sections of rear arc are controlled using conventional chilling.The present invention realizes low-carbon boron-containing steel stability contorting slab corner crack incidence < 0.1%.
Description
Technical field:
The present invention relates to a kind of low-carbon boron-containing steel continuous casting steel billet corner crack control methods, belong to continuous casting of iron and steel technology neck
Domain.
Background technique:
Boron-containing steel is the important component of micro alloyed steel.Boron element is added into steel can significantly improve the through hardening of steel
Property, and the elevated temperature strength of heat resisting steel can be improved, creep strength improves the red hardness of high-speed steel and the cutting power of cutter, extensively
It is produced applied to modern steel.However in practical boron-containing steel continuous casting production process, slab corner but takes place frequently transverse crack defect, causes
There is serious crackle and sticks up skin mass defect in stocking edge.For this purpose, continuous casting billet produced needs offline progress corner fire more
Flame cleaning, seriously upsets produced on-site rhythm.
Since boracic steel continuous casting billet production process takes place frequently corner crack defect as industry common technology problem, it is directed to both at home and abroad
Boracic steel continuous casting billet corner crack control technology research and development work is more deep.But existing boracic steel continuous casting billet angle
The steel grade that is related to of portion's crackle control is mainly peritectoid and middle carbon boron-containing steel, less to be directed to the corner crack control of low-carbon boron-containing steel continuous casting billet
System, and its control measure mainly concentrates it is as follows: (1) control molten steel composition, the reduction solutes such as casting blank solidification process organization crystal boundary P, S
Content；(2) the characteristics of refining process adds Ti, is preferentially combined using Ti with N in steel, realizes molten steel nitrogen fixation, thus the company of reduction
Casting blank solidification process BN is precipitated, and improves slab corner and organizes grain-boundary strength；(3) weak cold but the cold arc of strength control two and aligning area
Water distribution makes slab in bending and straightening process surface temperature with higher, to avoid the third brittle temperature zone of steel；(4) it adjusts
Whole conical degree of crystallizer, vibration and intensity of cooling, covering slag physical parameter etc., slow cooling slab initial set tissue simultaneously mitigate casting billet surface vibration
Trace prevents slab corner crack from generating.
However, practical boron-containing steel continuous casting production process, the main reason for causing its chink line to generate is BN in blank surface
It organizes crystal boundary to be precipitated, causes its embrittlement of grain boundaries and crack defect.Therefore, the key for fundamentally controlling its generation is control
The amount of precipitation of boron-containing steel continuous casting process crystal boundary BN.Currently, iron and steel enterprise's continuous casting low-carbon boron-containing steel process there is no effective control
The technique or method that its continuous casting billet corner crack generates.
Summary of the invention
The purpose of the present invention is provide a kind of low-carbon boron-containing steel continuous casting steel billet corner crack control in view of the above problems
Method processed, by nitrogen contents such as strict control converter smelting, tapping process and external refinings, and to continuous casting protective casting into
The offline leak detection of row and adjustment, the envelope protection of continuous casting process argon etc., strict guarantee continuous casting production process not nitrogen pick-up.It is basic herein
On, using the strong cold cold technique of control in two cold entirety especially high-temperature region, realize low-carbon boron-containing steel continuous casting process slab corner tissue
Precipitation is greatly decreased in crystal boundary BN, thus stability contorting slab corner crack incidence < 0.1%.
Above-mentioned purpose is achieved through the following technical solutions:
A kind of low-carbon boron-containing steel continuous casting steel billet corner crack control method, this method comprises:
(1) Composition Control: C:0.025~0.050, Si :≤0.035, Mn:0.13 in the low-carbon boron-containing steel~
0.22, P :≤0.02, S :≤0.015, Alt:0.025~0.050, B:0.001~0.002, surplus is iron；
(2) in the hot metal ratio control of converter steelmaking process 85.0%~87.0%, whole process uses bottom blowing mode, and is blowing
One rifle of blowing argon gas blows on earth after refining process elder generation nitrogen blowing, prevents from re-blowing, and nitrogen and argon gas use ratio are 1:9；
(3) for the control of smelting endpoint C content 0.035 ± 0.02, tapping temperature is 1660 ± 5 DEG C；
(4) converter smelting tapping process is tapped using semi deoxidized technique；
(5) tapping process carries out deoxidier and alloying simultaneously；
(6) after having gone out steel, ladle is directly transferred to argon station and carries out ar blowing refining；
(7) it in continuous casting process, is adopted in the wide of continuous casting billet, narrow-face foot roller area, two to four area of vertical curved segment, 1 section of segmental arc
It is controlled with strong cooling, and 2~8 sections of rear arc are controlled using conventional chilling, ton steel specific water is 1.2~1.35L.
The low-carbon boron-containing steel continuous casting steel billet corner crack control method, semi deoxidized technique described in step (4) go out
The specific method of steel is: ladle goes to oxygen content about 200 ± 100ppm that argon station determines oxygen Shi Gangzhong, past when molten steel is paved with packet bottom
Modifying agent is added in ladle, additive amount is 2.3~2.5kg of ton steel, and the promotor of ton steel 2.0kg is added on this basis.
The low-carbon boron-containing steel continuous casting steel billet corner crack control method, tapping process described in step (5) is simultaneously
The specific method for carrying out deoxidier and alloying is: deoxidier selects Al-Mn-Ca deoxidier, and alloyed feedstock selects medium carbon manganese
Iron, additive amount are 2.0~2.5kg/ of deoxidier tons of steel, 1.0~1.5kg/ tons of steel of mid-carbon fe-mn.
The low-carbon boron-containing steel continuous casting steel billet corner crack control method, the tool of ar blowing refining described in step (6)
Body method is: it is de- that argon station refining Argon early period tolerance carries out benefit aluminum steel after selecting 400NL/min to carry out 3~4min of Argon stirring
Oxygen, aluminum steel additional amount are 1kg/ tons of steel, select boron line to carry out in argon station refining latter stage boron micro-alloyed, are incorporated as a ton steel
0.14kg carries out 2~3min time 400NL/min argon gas stir process after boron line is added, it is ensured that boron is uniformly distributed in steel；Finally
Turn argon gas amount 150NL/min stirring, the time >=5min, the control of total refining time is in 14min~22min, to obtain N content and be
22~27ppm, other ingredients meet the molten steel composition that (1) requires.
The low-carbon boron-containing steel continuous casting steel billet corner crack control method, described in step (7) the width of continuous casting billet,
Narrow-face foot roller area, two to four area of vertical curved segment, 1 section of segmental arc using strong cooling control, and 2~8 sections of rear arc using conventional
Cooling control, ton steel specific water are the specific control method of 1.2~1.35L are as follows: outer arc water accounts for about always in the wide face foot roller of slab
The 9.5%~10.2% of water, narrow-face foot roller water account for the 4.2%~4.5% of total Water, found outer arc water in 2nd area of curved segment
The 11.6%~12.4% of total Water is accounted for, outer arc water accounts for the 11.8%~12.6% of total Water in 3rd area, outer arc water in 4th area
Amount accounts for the 13.0%~13.8% of total Water, and outer arc water accounts for the 7.7%~8.4% of total Water in 5th area 1 Duan of arc, arc
2, outer arc water accounts for the 6.7%~7.4% of total Water in 3 sections of corresponding 6th areas, the total water of outer arc water Zhan in 7th area 4~6 Duan
The 10.2%~10.6% of amount, 7 sections of aligning account for the 6.2%~6.6% of total Water with outer arc water in 8th area 8 Duan, remaining water
Amount is distributed to horizontal segment.
The utility model has the advantages that
1. (1) of the invention is quickly cooled down the tissue in the Precipitation Temperature area of slab corner, make BN in blank surface group as far as possible
Transgranular dispersion is knitted to be precipitated；(2) N content in strict control molten steel, or it is first in steel process of setting by adding Ti etc. into steel
In the element that B is precipitated in conjunction with N, to reduce the crystal boundary amount of precipitation of BN.However, for low-carbon boron-containing steel, since it is more
For subsequent cold rolling feeds, certain content Ti element is added into steel, easily causes the larger fluctuation of cold rolling roll bending performance.Therefore from root
Reduce the precipitation total amount of the textura epidermoidea crystal boundary BN of its continuous casting billet solidification processing in sheet and effectively controls boracic steel continuous casting billet angle
Portion's crackle generates, and crackle control effect is sufficiently stable；
2. the present invention has abandoned tradition using N content in the smelting, refining and continuous casting protective casting control boron-containing steel
The boron-containing steels production process such as peritectoid and middle carbon, will not be to subsequent cold-rolled products using additionally Ti measure being added to carry out molten steel fixed nitrogen method
Performance causes to fluctuate；
3. the present invention, in terms of for casting blank surface temperature control, slab integrally using strong cooling control, not only controls
Difficulty is small, implementation process is stable, and helps to protect continuous casting installation for casting.
Specific embodiment:
A kind of low-carbon boron-containing steel continuous casting steel billet corner crack control method, this method comprises:
(1) Composition Control: C:0.025~0.050, Si :≤0.035, Mn:0.13 in the low-carbon boron-containing steel~
0.22, P :≤0.02, S :≤0.015, Alt:0.025~0.050, B:0.001~0.002, surplus is iron；
(2) in the hot metal ratio control of converter steelmaking process 85.0%~87.0%, whole process uses bottom blowing mode, and is blowing
One rifle of blowing argon gas blows on earth after refining process elder generation nitrogen blowing, prevents from re-blowing, and nitrogen and argon gas use ratio are 1:9；
(3) for the control of smelting endpoint C content 0.035 ± 0.02, tapping temperature is 1660 ± 5 DEG C；
(4) converter smelting tapping process is tapped using semi deoxidized technique；
(5) tapping process carries out deoxidier and alloying simultaneously；
(6) after having gone out steel, ladle is directly transferred to argon station and carries out ar blowing refining；
(7) it in continuous casting process, is adopted in the wide of continuous casting billet, narrow-face foot roller area, two to four area of vertical curved segment, 1 section of segmental arc
It is controlled with strong cooling, and 2~8 sections of rear arc are controlled using conventional chilling, ton steel specific water is 1.2~1.35L.
The low-carbon boron-containing steel continuous casting steel billet corner crack control method, semi deoxidized technique described in step (4) go out
The specific method of steel is: ladle goes to oxygen content about 200 ± 100ppm that argon station determines oxygen Shi Gangzhong, past when molten steel is paved with packet bottom
Modifying agent is added in ladle, additive amount is 2.3~2.5kg of ton steel, and the promotor of ton steel 2.0kg is added on this basis.
The low-carbon boron-containing steel continuous casting steel billet corner crack control method, tapping process described in step (5) is simultaneously
The specific method for carrying out deoxidier and alloying is: deoxidier selects Al-Mn-Ca deoxidier, and alloyed feedstock selects medium carbon manganese
Iron, additive amount are 2.0~2.5kg/ of deoxidier tons of steel, 1.0~1.5kg/ tons of steel of mid-carbon fe-mn.
The low-carbon boron-containing steel continuous casting steel billet corner crack control method, the tool of ar blowing refining described in step (6)
Body method is: it is de- that argon station refining Argon early period tolerance carries out benefit aluminum steel after selecting 400NL/min to carry out 3~4min of Argon stirring
Oxygen, aluminum steel additional amount are 1kg/ tons of steel, select boron line to carry out in argon station refining latter stage boron micro-alloyed, are incorporated as a ton steel
0.14kg carries out 2~3min time 400NL/min argon gas stir process after boron line is added, it is ensured that boron is uniformly distributed in steel；Finally
Turn argon gas amount 150NL/min stirring, the time >=5min, the control of total refining time is in 14min~22min, to obtain N content and be
22~27ppm, other ingredients meet the molten steel composition that (1) requires.
The low-carbon boron-containing steel continuous casting steel billet corner crack control method, described in step (7) the width of continuous casting billet,
Narrow-face foot roller area, two to four area of vertical curved segment, 1 section of segmental arc using strong cooling control, and 2~8 sections of rear arc using conventional
Cooling control, ton steel specific water are the specific control method of 1.2~1.35L are as follows: outer arc water accounts for about always in the wide face foot roller of slab
The 9.5%~10.2% of water, narrow-face foot roller water account for the 4.2%~4.5% of total Water, found outer arc water in 2nd area of curved segment
The 11.6%~12.4% of total Water is accounted for, outer arc water accounts for the 11.8%~12.6% of total Water in 3rd area, outer arc water in 4th area
Amount accounts for the 13.0%~13.8% of total Water, and outer arc water accounts for the 7.7%~8.4% of total Water in 5th area 1 Duan of arc, arc
2, outer arc water accounts for the 6.7%~7.4% of total Water in 3 sections of corresponding 6th areas, the total water of outer arc water Zhan in 7th area 4~6 Duan
The 10.2%~10.6% of amount, 7 sections of aligning account for the 6.2%~6.6% of total Water with outer arc water in 8th area 8 Duan, remaining water
Amount is distributed to horizontal segment.
Stablize pulling rate production section with 1.4m/min as the DC51D+Z low-carbon boron-containing steel process slab of 230mm × 1530mm
It is specific as follows for corner crack control:
(1) the DC51D+Z low-carbon boron-containing steel target component of the production are as follows: C:0.04, Si:0.020, Mn:0.19, P:
0.014, S:0.013, Alt:0.038, B:0.0012；
(2) smelting process is smelted using 250t converter, and raw materials for metallurgy is molten iron and steel scrap, and hot metal ratio control exists
85.0%, whole process uses bottom blowing mode, and Primary period is blown using nitrogen, and the middle and later periods is blown using argon gas, and converting process uses
Form blows one rifle on earth, firmly prevents technique of re-blowing, and nitrogen and argon gas use ratio are 1:9；
(3) the DC51D+Z low-carbon boron-containing steel described in, the control of converter smelting endpoint target C content are in 0.04, tapping temperature
1660±5℃；
(4) tapping process is tapped using semi deoxidized technique after converter smelting, Control for Oxygen Content target of tapping are as follows: ladle turns
The oxygen content about 200ppm of oxygen Shi Gangzhong is determined to argon station.Tapping process slag charge adds principle are as follows: when molten steel is paved with packet bottom toward steel
It is Al that main component is added in packet2O3With the modifying agent of CaO, the content of the two is respectively as follows: that (SiO2 2.7%, CaO are
65.3%, Al2O3For 11.1%, CaF2 8.6%, Al 4.8%), additive amount is about ton 2.3~2.4kg of steel, basic herein
The upper promotor that ton steel about 2.0kg is added, specific ingredient are as follows: (SiO2 4.5%, CaO 27.1%, MgO 5.2%,
Al2O3 is 26.9%, CaF2 3.9%, Al 24.7%)；
(5) tapping process carries out deoxidier and alloying simultaneously, and it is 16:3:1 that deoxidier, which selects Al:Mn:Ca content ratio,
(the main component C of Al-Mn-Ca system slag charge is 0.28%, Si 0.28%, and Mn 12.25%, P 0.017%, S are
0.016%, Al 57.29%, Ti 0.016%, Ca 3.29%) Al-Mn-Ca deoxidier, alloyed feedstock select
Mid-carbon fe-mn, it be about 0.56%, Mn be about 79.69%, P is about that 0.193%, S is about that main component C, which is about 1.33%, Si,
0.008%, surplus Fe), deoxidier additive amount is about 2kg/ tons of steel, and mid-carbon fe-mn additive amount is about 1.2kg/ tons of steel；
(6) after having gone out steel, steel is not produced into LF refining, and ladle is directly transferred to argon station and carries out ar blowing refining.Argon station refining
Argon tolerance early period carries out mending aluminum steel deoxidation, aluminum steel additional amount after selecting 400NL/min to carry out 3~4min of stronger Argon stir about
About 1kg/ tons of steel.Boron line is selected to carry out in argon station refining latter stage boron micro-alloyed, being added is about ton steel 0.14kg, and boron line is added
It carries out 2~3min time argon gas afterwards to handle compared with strong mixing, it is ensured that boron is uniformly distributed in steel；Finally turn weaker stirring, the choosing of argon gas amount
With 150NL/min, guarantee time >=5min, total refining time control in 17min or so, thus obtain N content be 22~
25ppm, other ingredients meet the molten steel composition that (1) requires；
(7) in protective casting link, molten steel is in casting process since ladle long nozzle system protection is cast not in order to prevent
When and cause molten steel nitrogen pick-up, to ladle nozzle system carry out leak detection and protection.It is cone that ladle long nozzle, which selects arrival end,
The mouth of a river of shape bowl structure, and add taper asbestos pad.After casting starts, first with gas burner carry out collector nozzle of ladle with
Long water gap bowl part airtightness is examined, and if flame is inhaled into, then shows that leakproofness is bad at this, is covered long nozzle again.If close
Closing property is met the requirements, then is opening the process of pouring, and is passed through 30~40NL/min flow argon gas toward long water gap bowl part junction, is formed to it
Argon seals state, further prevents connecting not tight between long water gap bowl part and collector nozzle of ladle and sucking air and cause molten steel nitrogen pick-up.
(8) the offline airtightness of water-coating port uses argon pressure as test stone in, before producing the low-carbon boron-containing steel, offline
Condition is passed through 10NL/min argon gas amount toward tundish upper nozzle and stopper, it is ensured that its pressure is that 1.0-1.5bar is considered as airtightness conjunction
Lattice.In steel casting process, stopper argon blowing rate stability contorting is 5.0L/min, and submersed nozzle argon envelope tolerance stability contorting is
6.0L/min, so that the mouth of a river link of centering packet to crystallizer forms argon envelope；
(9) in continuous casting process, in order to effectively prevent continuous casting billet solidification processing BN to concentrate in its surface layer austenite structure crystal boundary
It is precipitated, in the wide of continuous casting billet, narrow-face foot roller area, two to four area of vertical curved segment, 1 section of segmental arc using strong cooling control, then
2~8 sections of arc are controlled using conventional chilling, and ton steel specific water selects 1.25L.Wherein, outer arc water is in the wide face foot roller of slab
416L, narrow-face foot roller water 188L found outer arc water 516L in 2nd area of curved segment, and outer arc water accounts for total Water in 3rd area
525L, outer arc water 586L in 4th area, outer arc water 349L in 5th area 1 Duan of arc, outer arc in 2,3 sections of corresponding 6th areas of arc
Outer arc water 458L in 7th area water 292L, 4~6 Duan, aligning 7 sections with 8th area 8 Duan in outer arc water 285L, 9 sections of level
With outer arc water 203L in 8th area 10 Duan, outer arc water 245L in 11 sections of level, 9th area 12 Duan, 13 sections of level, 14 sections
Outer arc water 245L in tenth area.
It is cold with hydraulic art based on above-mentioned smelting, refining, continuous casting protective casting and two, if the item that continuous casting machine roll-gap precision meets
Under part, it can be ensured that the low-carbon boron-containing steel continuous casting billet corner crack incidence < 0.1%.
It should be noted that above-described embodiment is only presently preferred embodiments of the present invention, there is no for the purpose of limiting the invention
Protection scope, made equivalent substitution or substitution all belongs to the scope of protection of the present invention on the basis of the above, of the invention
Protection scope is subject to claims.
Claims (5)
1. a kind of low-carbon boron-containing steel continuous casting steel billet corner crack control method, it is characterised in that: this method comprises:
(1) Composition Control: C:0.025~0.050, Si :≤0.035, Mn:0.13~0.22, P in the low-carbon boron-containing steel:
≤ 0.02, S :≤0.015, Alt:0.025~0.050, B:0.001~0.002, surplus are iron；
(2) in the hot metal ratio control of converter steelmaking process 85.0%~87.0%, whole process uses bottom blowing mode, and is blowing
One rifle of blowing argon gas blows on earth after journey elder generation nitrogen blowing, prevents from re-blowing, and nitrogen and argon gas use ratio are 1:9；
(3) for the control of smelting endpoint C content 0.035 ± 0.02, tapping temperature is 1660 ± 5 DEG C；
(4) converter smelting tapping process is tapped using semi deoxidized technique；
(5) tapping process carries out deoxidier and alloying simultaneously；
(6) after having gone out steel, ladle is directly transferred to argon station and carries out ar blowing refining；
(7) strong in 1 section of use of the wide of continuous casting billet, narrow-face foot roller area, two to four area of vertical curved segment, segmental arc in continuous casting process
Cooling control, and 2~8 sections of rear arc are controlled using conventional chilling, ton steel specific water is 1.2~1.35L.
2. low-carbon boron-containing steel continuous casting steel billet corner crack control method according to claim 1, it is characterised in that: step
(4) specific method of the semi deoxidized technique tapping described in is: ladle go to argon station determine the oxygen content about 200 of oxygen Shi Gangzhong ±
Modifying agent is added when molten steel is paved with packet bottom in 100ppm in ladle, and additive amount is 2.3~2.5kg of ton steel, on this basis plus
Enter a ton promotor of steel 2.0kg.
3. low-carbon boron-containing steel continuous casting steel billet corner crack control method according to claim 1, it is characterised in that: step
(5) tapping process described in carries out deoxidier simultaneously and the specific method of alloying is: deoxidier selects Al-Mn-Ca deoxidation
Agent, alloyed feedstock select mid-carbon fe-mn, additive amount be 2.0~2.5kg/ of deoxidier tons of steel, 1.0~1.5kg/ tons of mid-carbon fe-mn
Steel.
4. low-carbon boron-containing steel continuous casting steel billet corner crack control method according to claim 1, it is characterised in that: step
(6) specific method of the ar blowing refining described in is: argon station refines Argon early period tolerance and 400NL/min is selected to carry out Argon stirring
It carries out mending aluminum steel deoxidation after 3~4min, aluminum steel additional amount is 1kg/ tons of steel, selects boron line to carry out the micro- conjunction of boron in argon station refining latter stage
Aurification is incorporated as a ton steel 0.14kg, carries out 2~3min time 400NL/min argon gas stir process after boron line is added, it is ensured that steel
Middle boron is uniformly distributed；Finally turn argon gas amount 150NL/min stirring, the time >=5min, the control of total refining time 14min~
22min, to obtain, N content is 22~27ppm, other ingredients meet the molten steel composition that (1) requires.
5. low-carbon boron-containing steel continuous casting steel billet corner crack control method according to claim 1, it is characterised in that: step
(7) described in the wide of continuous casting billet, narrow-face foot roller area, two to four area of vertical curved segment, 1 section of segmental arc using strong cooling control
System, and 2~8 sections of rear arc are controlled using conventional chilling, ton steel specific water is the specific control method of 1.2~1.35L are as follows: slab
Outer arc water accounts for about the 9.5%~10.2% of total Water in wide face foot roller, narrow-face foot roller water account for total Water 4.2%~
4.5%, it founds outer arc water in 2nd area of curved segment and accounts for the 11.6%~12.4% of total Water, outer arc water accounts for total Water in 3rd area
11.8%~12.6%, outer arc water accounts for the 13.0%~13.8% of total Water in 4th area, outer arc water in 5th area 1 Duan of arc
The 7.7%~8.4% of total Water is accounted for, outer arc water accounts for the 6.7%~7.4% of total Water, 4 in 2,3 sections of corresponding 6th areas of arc
Outer arc water accounts for the 10.2%~10.6% of total Water in 7th area~6 Duan, and 7 sections of aligning is accounted for outer arc water in 8th area 8 Duan
The 6.2%~6.6% of total Water, remaining water operation to horizontal segment.
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