CN100457326C - Control method for transverse cracks of vanadium-containing high-nitrogen steel continuous casting slab corners - Google Patents
Control method for transverse cracks of vanadium-containing high-nitrogen steel continuous casting slab corners Download PDFInfo
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- CN100457326C CN100457326C CNB2007100489253A CN200710048925A CN100457326C CN 100457326 C CN100457326 C CN 100457326C CN B2007100489253 A CNB2007100489253 A CN B2007100489253A CN 200710048925 A CN200710048925 A CN 200710048925A CN 100457326 C CN100457326 C CN 100457326C
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 238000009749 continuous casting Methods 0.000 title claims abstract description 48
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 45
- 239000010959 steel Substances 0.000 title claims abstract description 45
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 37
- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 35
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005266 casting Methods 0.000 claims abstract description 52
- 239000000498 cooling water Substances 0.000 claims abstract description 22
- 238000001816 cooling Methods 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000003068 static effect Effects 0.000 claims abstract description 5
- 239000002893 slag Substances 0.000 claims description 23
- 239000000203 mixture Substances 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 2
- 238000003786 synthesis reaction Methods 0.000 claims description 2
- 239000000843 powder Substances 0.000 abstract 2
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 229910000870 Weathering steel Inorganic materials 0.000 description 15
- 238000007920 subcutaneous administration Methods 0.000 description 12
- 230000002950 deficient Effects 0.000 description 11
- 238000005336 cracking Methods 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 8
- 230000007547 defect Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 239000000470 constituent Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000010949 copper Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000000395 magnesium oxide Substances 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 239000010955 niobium Substances 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000010456 wollastonite Substances 0.000 description 2
- 229910052882 wollastonite Inorganic materials 0.000 description 2
- 229910004261 CaF 2 Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 230000009395 genetic defect Effects 0.000 description 1
- 239000000320 mechanical mixture Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Abstract
The invention discloses a control method of transverse cracks of a vanadium-containing high-nitrogen steel continuous casting slab corner, which can effectively eliminate the transverse cracks of the continuous casting slab surface and the lower corner, and can eliminate the longitudinal cracks and the transverse cracks of the continuous casting slab surface. The method comprehensively uses the following technical measures: presetting crystallizer cooling water quantity, wherein the wide-surface cooling water quantity is 3000-3050L/min, and the narrow-surface cooling water quantity is 360-365L/min; the casting machine pulling speed is improved and stabilized at 0.8-1.5 m/min, and the vibration frequency is 140-210 Hz; after continuous casting and pulling, rapidly adding the casting powder into the crystallizer, wherein the alkalinity of the casting powder is 1.0-1.40, the melting point is 1100-1160 ℃, and the viscosity at 1300 ℃ is 0.10-0.40 Pa.s; the amount of cooling water for the casting blank in the secondary cooling section is reduced, and the continuous casting specific water amount is controlled to be 0.55-0.60L/kg by a static or dynamic adjusting method.
Description
Technical field
The present invention relates to a kind of method of quality control of continuous casting steel billet, the particularly a kind of high nitrogen steel of vanadium continuous casting steel billet surface and subcutaneous method of quality control of containing.
Background technology
The content that contains Cu, Cr, Ni, Al, V, N element in the high nitrogen high-strength weathering steel of the vanadium steel grades is higher, and carbon content is positioned at the peritectic reaction district.When continuous casting production carbon content is positioned at the steel grade in peritectic reaction district, strand easily produces face crack, and compositions such as the Cu that adds in the steel, Cr, Ni make the crack sensitivity of this steel grade stronger, compositions such as the Al of Jia Ruing, V, N are in continuous casting production process simultaneously, dynamically separate out or static state is separated out because of Al, the V of solid solution under the high temperature is at austenite grain boundary with AlN, V (CN) form when temperature reduces, further increased crack sensitivity.Straight arc slab caster strand is at bending area, strand inner arc side and outer arc side are subjected to compression and tensile stress respectively, and in the aligning zone, strand inner arc side and outer arc side are subjected to tensile stress and compression respectively, especially strand is under the tensile stress effect, concentrate because of the notch effect generation stress of oscillation mark, quickened the formation and the expansion of crackle.Therefore, adopt the production of straight arc slab caster contain the high nitrogen high-strength weathering steel of vanadium not only casting billet surface easily produce longitudinal crack, the subcutaneous easy generation pattern cracking of strand, and the strand bight very easily produces the angle transverse fissure.Because the transverse corner crack that produces on the strand can't be cleared up aborning, after the band defective was rolling, product surface limit portion can produce layer defects, makes product percent of pass only reach 40～70%.Therefore, producing qualified strand is the key link that the production high-quality contains the high nitrogen high-strength weathering steel of vanadium, and research and development are the core technologies that improves slab quality with containing the continuous casting process that the high nitrogen high-strength weathering steel of vanadium adapts.
" iron and steel " magazine (the 22nd～25 page of the 33rd the 1st phase of volume in January, 1998, reduce the research that contains niobium, vanadium, titanium micro-alloyedization steel continuous casting steel billet transverse corner crack, Wang Xinhua, Wang Wenjun, works such as Liu Xinyu) reported by improving permanent pulling rate rate, liquid level and controlled devoting rate and casting machine automatically the arc precision, and prolong the plasticity characteristics according to the high temperature of steel and adopt rational two cold technologies, Baosteel contains niobium, vanadium, titanium micro-alloyedization steel continuous casting billet angle transverse fissure incidence significantly to be reduced, and angle transverse fissure index reduces to 3.0 by 19.2." Shoudu Iron and Steel Co science and technology " magazine (the 19th～21 page of the 2nd phase in April, 2006, contain the generation reason and the corrective measure of vanadium deck of boat plate slab transverse corner crack line, fiber crops celebrating Shen, Jiang Zhonghang, works such as Xu Li) reported that Shoudu Iron and Steel Co is by adopting the low overheat casting, the degree of superheat is lower than 25 ℃, keep pulling rate and mold liquid level stable, reduce by two cold water distribution quantities, reduce intensity of cooling, suitably improve pulling rate, high-strength deck of boat plate slab transverse corner crack incidence is reduced to below 0.10% by 11.80%.
The steel grade nitrogen content of being reported in above-mentioned research lower ([N]=0.0028%～0.0042%), and not cupric, nickel, evanohm element, crack sensitivity are lower than and contain the high nitrogen high-strength weathering steel of vanadium." improve pulling rate and reduce continuous casting secondary intensity of cooling " technology of taking in the report not with the continuous cast mold tapering; crystallizer protecting residue; the crystallizer cooling system combines; and influence the factor that crystallizer conducts heat; as the continuous casting pulling rate; the copper plate of crystallizer tapering; crystallizer protecting residue; the crystallizer cooling system is to be mutually related; must make four to adapt with the continuous casting steel grades and just can reach the effect of strand uniformly transfer heat in the crystallizer; play the effect that improves cc billet surface quality; therefore, to containing the high nitrogen high-strength weathering steel of vanadium only from improving the continuous casting pulling rate; improving two cold heat transfer types is to be difficult to eliminate continuous casting steel billet transverse corner crack line defective.At present, solving the technology that contains the high nitrogen high-strength weathering steel of vanadium strand transverse corner crack line, transverse crack and pattern cracking defective does not appear in the newspapers as yet.By above-mentioned research as seen, the microalloying cc billet surface quality of research control at present only is confined to the not low nitrogen steel casting billet surface transverse corner crack of cupric, nickel, chromium, these researchs are containing aspect vanadium high nitrogen high-strength weathering steel casting billet surface and the subcutaneous transverse corner crack line defect Control, are difficult to the bigger effect of performance.
Summary of the invention
Technical problem to be solved by this invention provides a kind of vanadium blank angle of high nitrogen steel casting portion transverse crack control method that contains, continuous casting billet surface and subcutaneous transverse corner crack defective can not only be eliminated effectively by this control method, continuous casting billet surface longitudinal crack and surface transverse cracks defective can also be eliminated simultaneously.
The technical solution adopted for the present invention to solve the technical problems is: the vanadium cross crack of blank angle of high nitrogen steel casting board control method that contains of the present invention, it is characterized in that containing vanadium cross crack of blank angle of high nitrogen steel casting board control method, it is characterized in that this method synthesis utilization following technique measures: 1. preestablish the crystallizer cooling water inflow, wide cooling water inflow 3000～3050L/min, the leptoprosopy water yield is set at 360～365L/min; 2. improve the casting machine pulling rate, the casting machine pulling rate is stabilized in 0.8～1.5m/min, vibration frequency 140～210Hz; 3. add continuous casting covering slag after the continuous casting pulling rate is opened and watered rapidly in crystallizer, the basicity of continuous casting covering slag is 1.0～1.40, and fusing point is 1100～1160 ℃, and the viscosity in the time of 1300 ℃ is 0.10～0.40Pas; 4. reduce secondary cooling zone strand cooling water amount, static or dynamic method of adjustment is controlled at 0.55～0.60L/kg with the continuous casting ratio water yield.
The invention has the beneficial effects as follows, can not only eliminate effectively and contain the high nitrogen steel continuous casting billet of vanadium surface and subcutaneous bight transverse part crack defect, can also eliminate its surface longitudinal crack and surface transverse cracks defective simultaneously, and surface and subcutaneous pattern cracking and transverse crack defective; Can implement hot delivery and hot charging technology to containing the high nitrogen steel continuous casting billet of vanadium, to alleviate high-strength weathering steel " copper brittleness " defective; Can reduce and contain the high nitrogen steel continuous casting billet cleaning of vanadium loss, raising recovery rate of iron; Can eliminate the high nitrogen steel of the vanadium finished product that contains that causes because of the continuous casting steel billet genetic defects and play layer defects.This control method is equally applicable to the steel grade that continuous casting productions such as other weathering steels, high nitrogen steel easily produce the transverse corner crack line.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
Contain vanadium cross crack of blank angle of high nitrogen steel casting board control method and mainly be to control and contain the vanadium cross crack of blank angle of high nitrogen steel casting board by the integrated use that preestablishes the crystallizer cooling water inflow, in crystallizer, adds covering slag, improves the casting machine pulling rate and reduce technical measures such as secondary cooling zone strand cooling water amount.Each technical measures is specific as follows:
1. preestablish the crystallizer cooling water inflow
Wide cooling water inflow 3000～3050L/min, the leptoprosopy water yield is set at 360～365L/min.Thereby wide of crystallizer and leptoprosopy heat flow density are controlled at 1250～1550kW/m respectively
2With 1000～1350kW/m
2, the crystallizer leptoprosopy is 0.80～0.88 with wide hot-fluid ratio.Conical degree of crystallizer was adjusted to 1.10%/m by former 1.25%/m.
2. improve the casting machine pulling rate
The casting machine pulling rate is stabilized in 0.8～1.5m/min, and vibration frequency 140～210Hz is decreased to the strand depth of chatter mark below the 1.0mm, and the casting blank surface temperature of crystallizer outlet is increased to 1050～1150 ℃.
3. in crystallizer, add continuous casting covering slag after the continuous casting pulling rate is opened and watered rapidly
Basicity (the CaO/SiO of continuous casting covering slag
2) be 1.0～1.40, fusing point is 1100～1160 ℃, the viscosity in the time of 1300 ℃ is 0.10～0.40Pas.The consumption of continuous casting covering slag is controlled at 0.55～0.65kg/t, further the strand depth of chatter mark is controlled in the 0.8mm.
Continuous casting covering slag can be pre-melted slag or mechanical mixture slag, and product is the hollow bead slag that mist projection granulating is produced.And comprise following main component: CaO 28～38%, SiO by weight percentage
226～36%, Al
2O
3≤ 10%, MgO≤8%, Na
2O 5～15%, F
-2～12%, wherein: CaO can who knows etc. that the material that contains CaO allocates into by pre-melted slag, wollastonite, cement; SiO
2Can who knows by pre-melted slag, wollastonite, cement, quartz sand, feldspar etc. contains SiO
2Material allocate into; Al
2O
3Can be who knows by pre-melted slag, bauxite, cement, white clay etc. contains Al
2O
3Material allocate into; MgO can be allocated into by the material that pre-melted slag, magnesia etc. contains MgO; Na
2O can be by pre-melted slag, Na
2CO
3Deng containing Na
2The material of O is allocated into; F
-Can be by pre-melted slag, CaF
2(fluorite) etc. contains F
-Material allocate into.
4. reduce secondary cooling zone strand cooling water amount (the continuous casting ratio water yield)
Static or dynamic method of adjustment is controlled at 0.55～0.60L/kg with the continuous casting ratio water yield.State secondary cooling zone, 990～1020 ℃ of casting blank surface temperatures, the maximum backheat speed of casting billet surface≤30 ℃/m, maximum temperature drop rate≤20 ℃/m.
In the described composition that contains the high nitrogen steel of vanadium by weight percentage: V 0.02～0.15%, and N 0.01～0.03%.
Embodiment 1:
This embodiment is the high-strength weathering Yi shape steel strand pattern cracking defective that utilization control method of the present invention is controlled the YQ450NQR1 trade mark, and YQ450NQR1 high-strength weathering steel chemical constituent sees Table 1.
When continuous casting is produced, wide cooling water inflow of crystallizer is set at 3000L/min before watering opening, the leptoprosopy water yield is set at 360L/min, opens to push basicity (CaO/SiO rapidly after watering in crystallizer
2) be 1.35, fusing point is that 1100 ℃, 1300 ℃ viscosity is the crystallizer protecting residue of 0.10Pas; and within a short period of time is with casting machine pulling rate raising, stable to 1.5m/min; this moment, the casting machine vibration frequency reached 210Hz, simultaneously secondary cooling zone strand cooling water amount (the continuous casting ratio water yield) was set at 0.60L/kg.The consumption of covering slag is determined as 0.55kg/t during application, and crystallizer exit casting blank surface temperature reaches 1120 ℃, 1020 ℃ of two cold-zone casting blank surface temperatures, 30 ℃/m of maximum backheat speed, 20 ℃/m of maximum temperature drop rate.After casting finishes, the strand of producing is carried out surface and subcutaneous quality inspection, check shows strand depth of chatter mark≤0.8mm, casting billet surface does not have longitudinal crack, transverse corner crack line, subcutaneous no pattern cracking, with the strand mill product of producing, layer defects has not been seen in the check of finished product, product qualified rate reaches 100%.
Table 1--YQ450NQR1 high-strength weathering steel chemical constituent
| C | Si | Mn | P | S | Cu | Cr | Ni | V | Als | N |
| 0.11 ～ 0.14 | 0.30 ～ 0.50 | 1.25 ～ 1.40 | 0.012 ～ 0.020 | 0.005 ～ 0.010 | 0.20 ～ 0.30 | 0.20 ～ 0.30 | 0.15 ～ 0.25 | 0.08 ～ 0.15 | 0.03 ～ 0.08 | 0.018 ～ 0.025 |
Embodiment 2:
This embodiment is the high-strength weathering steel strand pattern cracking defective that utilization control method of the present invention is controlled to be the Q450NQR1 trade mark, and the chemical constituent of Q450NQR1 high-strength weathering steel sees Table 2.
Just wide cooling water inflow of crystallizer is set at 3050L/min before continuous casting production, and the leptoprosopy water yield is set at 365L/min, and secondary cooling zone strand cooling water amount (the continuous casting ratio water yield) is set at 0.55L/kg.Open and in crystallizer, push basicity (CaO/SiO rapidly after watering
2) be 1.20, fusing point is that 1120 ℃, 1300 ℃ viscosity is the crystallizer protecting residue of 0.20Pas; and within a short period of time is with casting machine pulling rate raising, stable to 1.2m/min; this moment, the casting machine vibration frequency reached 180Hz; the consumption of covering slag is determined as 0.60kg/t during application; crystallizer exit casting blank surface temperature reaches 1080 ℃; 1000 ℃ of two cold-zone casting blank surface temperatures, 28 ℃/m of maximum backheat speed, 18 ℃/m of maximum temperature drop rate.After casting finishes, the strand of producing is carried out surface and subcutaneous quality inspection, check shows strand depth of chatter mark≤0.8mm, casting billet surface does not have longitudinal crack, transverse corner crack line, subcutaneous no pattern cracking, with the strand mill product of producing, layer defects has not been seen in the check of finished product, product qualified rate reaches 100%.
The chemical constituent of table 2--Q450NQR1 high-strength weathering steel
| C | Si | Mn | P | S | Cu | Cr | Ni | V | Als | N |
| 0.06 ～ 0.09 | 0.37 ～ 0.48 | 0.84 ～ 1.00 | 0.010 ～ 0.016 | 0.002 ～ 0.008 | 0.26 ～ 0.32 | 0.45 ～ 0.55 | 0.21 ～ 0.28 | 0.06 ～ 0.10 | 0.02 ～ 0.06 | 0.013 ～ 0.018 |
Embodiment 3:
This embodiment is the high-strength weathering Yi shape steel strand pattern cracking defective that utilization control method of the present invention is controlled the YQ450NQR1 trade mark, and YQ450NQR1 high-strength weathering steel chemical constituent sees Table 1.When continuous casting is produced, wide cooling water inflow of crystallizer is set at 3025L/min before watering opening, the leptoprosopy water yield is set at 362L/min, simultaneously secondary cooling zone strand cooling water amount (the continuous casting ratio water yield) is set at 0.58L/kg.Open and in crystallizer, push basicity (CaO/SiO rapidly after watering
2) be 1.0, fusing point is that 1160 ℃, 1300 ℃ viscosity is the crystallizer protecting residue of 0.40Pas; and within a short period of time is with casting machine pulling rate raising, stable to 0.8m/min; this moment, the casting machine vibration frequency reached 140Hz; the consumption of covering slag is determined as 0.65kg/t during application; crystallizer exit casting blank surface temperature reaches 1050 ℃; 990 ℃ of two cold-zone casting blank surface temperatures, 25 ℃/m of maximum backheat speed, 15 ℃/m of maximum temperature drop rate.After casting finishes, the strand of producing is carried out surface and subcutaneous quality inspection, check shows strand depth of chatter mark≤0.8mm, casting billet surface does not have longitudinal crack, transverse crack, subcutaneous no pattern cracking with the strand mill product of producing, has not been seen layer defects to the check of finished product.
Claims (7)
1. contain vanadium cross crack of blank angle of high nitrogen steel casting board control method, it is characterized in that this method synthesis utilization following technique measures:
1. preestablish the crystallizer cooling water inflow, wide cooling water inflow 3000～3050L/min, the leptoprosopy cooling water inflow is set at 360～365L/min;
2. improve the casting machine pulling rate, the casting machine pulling rate is stabilized in 0.8～1.5m/min, vibration frequency 140～210Hz;
3. add continuous casting covering slag after the continuous casting pulling rate is opened and watered rapidly in crystallizer, the basicity of continuous casting covering slag is 1.0～1.40, and fusing point is 1100～1160 ℃, and the viscosity in the time of 1300 ℃ is 0.10～0.40Pas;
4. reduce secondary cooling zone strand cooling water amount, static or dynamic method of adjustment is controlled at 0.55～0.60L/kg with the continuous casting ratio water yield.
2. the vanadium cross crack of blank angle of high nitrogen steel casting board control method that contains as claimed in claim 1, it is characterized in that: the tapering on-line setup of described crystallizer is 1.10%/m.
3. the vanadium cross crack of blank angle of high nitrogen steel casting board control method that contains as claimed in claim 1 or 2 is characterized in that: wide of described crystallizer and leptoprosopy heat flow density are controlled at 1250～1550kW/m respectively
2With 1000～1350kW/m
2, the crystallizer leptoprosopy is 0.80～0.88 with wide hot-fluid ratio.
4. the vanadium cross crack of blank angle of high nitrogen steel casting board control method that contains as claimed in claim 1 is characterized in that: described secondary cooling zone, 990～1020 ℃ of casting blank surface temperatures, the maximum backheat speed of casting billet surface≤30 ℃/m, maximum temperature drop rate≤20 ℃/m.
5. the vanadium cross crack of blank angle of high nitrogen steel casting board control method that contains as claimed in claim 1, it is characterized in that: the consumption of described continuous casting covering slag is controlled at 0.55～0.65kg/t.
6. as claim 1 or the 5 described vanadium cross crack of blank angle of high nitrogen steel casting board control methods that contain, it is characterized in that: described continuous casting covering slag comprises following main component by weight percentage
CaO：28～38％、SiO
2：26～36％、Al
2O
3：≤10％、MgO：≤8％、Na
2O：5～15％、F
-：2～12％。
7. the vanadium cross crack of blank angle of high nitrogen steel casting board control method that contains as claimed in claim 1 is characterized in that: in the described composition that contains the high nitrogen steel of vanadium by weight percentage
V：0.02～0.15％，N：0.01～0.03％。
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