CN109014168A - A kind of continuous casting manufacturing technique producing generous section pipe line steel slab - Google Patents
A kind of continuous casting manufacturing technique producing generous section pipe line steel slab Download PDFInfo
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- CN109014168A CN109014168A CN201811072809.XA CN201811072809A CN109014168A CN 109014168 A CN109014168 A CN 109014168A CN 201811072809 A CN201811072809 A CN 201811072809A CN 109014168 A CN109014168 A CN 109014168A
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- tundish
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/60—Pouring-nozzles with heating or cooling means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
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- Mechanical Engineering (AREA)
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Abstract
The invention discloses a kind of continuous casting manufacturing technique for producing generous section pipe line steel slab, include the following steps: that (1) main component-(5) steel pouring process that the process of pouring-(3) continuous casting process takes the covering slag of whole process protection casting-(4) Mold surface laying is opened in baking-(2) online；The present invention is for the technical problems such as steel plate inspection qualification rate after crystallizer flow field bias current slag and slab roll when casting generous section pipe line steel is low; the shortcomings that overcoming the prior art; the continuous casting manufacturing technique of the generous section pipe line steel slab of production of offer; by adjusting the upper and lower gate structure of tundish and covering slag viscosity; reduce the generation of " slag " phenomenon in crystallizer; cleanliness is improved, and then improves and rolls rear steel plate inspection qualification rate and field trash grading qualification rate.
Description
Technical field
The invention belongs to metallurgical technology fields, are related to a kind of continuous casting process, specifically a kind of generous section pipe of production
The continuous casting manufacturing technique of line steel slab.
Background technique
Sino-Russian natural gas Dong Xianguandao (referred to as Sino-Russian eastern line) is the big throughput rate natural gas tube of the Sino-Russian long range built jointly
Road, to China's clean energy resource supply is promoted, Optimization of Energy Structure realizes energy-saving and emission-reduction, improves atmospheric environment, administers air mist
Haze improves people's living standard, realizes Sustainable Socioeconomic Development, has actively and far-reaching influence, and the pipeline is because being laid with
Be located in the Northeast of China, year the lowest temperature most down to -45 DEG C, so requiring very high, specification and grade of steel to tubing low-temperature flexibility
For 25.7/30.8mm × OD1422mm X80M, 25.7 × 4365mm/30.8mm of steel plate × 4350mm × 12150mm is used
X80M belongs to landmark product in pipe line steel development.
To meet pipe line steel steel plate rolling compression ratio requirement, 260/320mm × 2770mm pipe line steel slab need to be used to carry out
Rolling, specification slab production difficulty in continuous casting is larger, and former continuous casting manufacturing technique is using tundish upper nozzle structure
Straight barrel type, being lauched mouth structure is bilateral pass, and when casting generous slab, molten steel enters crystallizer by upper and lower mouth of a river channel
Afterwards, crystallizer flow field " bias current " easily is formed, causes covering slag melt cinder to be unevenly distributed, slag phenomenon easily occur, melt cinder is rolled up
It is not easy removal of floating after entering molten steel, is captured by initial solidification shell, is formed close to the inclusion defect of casting billet surface, cause generous section
Pipe line steel slab rolls the problem that rear steel plate inspection qualification rate is low and field trash grading qualification rate is low.
The flow field of Mold not only has an important influence on slag interface behavior in crystallizer, but also in it
Solidification and heat transfer influence is very big, and the quality of the steel liquid flow state in crystallizer directly affects Inner Quality of Billet and surface matter
Amount；Therefore, drawbacks described above is overcome to research and develop a kind of utilization Slab Caster production 260/320mm × 2770mm specification pipeline
The technique of the production of steel continuous casting billet and the upper and lower mouth of a river of applicable continuous casting production become those skilled in the art's skill urgently to be resolved
Art problem.
Summary of the invention
The technical problem to be solved by the present invention is to, for when casting generous section pipe line steel the bias current of crystallizer flow field roll up
It is generous disconnected to provide a kind of production for the shortcomings that slag and slab roll the technical problems such as rear steel plate inspection qualification rate is low, overcome the prior art
The continuous casting manufacturing technique of face pipe line steel slab reduces crystallizer by adjusting the upper and lower gate structure of tundish and covering slag viscosity
The generation of interior " slag " phenomenon improves cleanliness, and then improves and roll rear steel plate inspection qualification rate and field trash grading qualification
Rate.
In order to solve the above technical problems, the present invention provides a kind of continuous casting work for producing generous section pipe line steel slab
Skill comprises the following specific steps that:
(1) online baking
Tundish upper nozzle is embedded in tundish bottom, installs porous tundish lower nozzle below tundish, starts to pour in casting machine
Before casting, tundish and porous collector nozzle are toasted online, baking time >=120min, when tundish temperature >=1100 DEG C and
Less than 1250 DEG C, while tundish lower nozzle temperature >=1000 DEG C and then reaching less than 1200 DEG C and opens the condition of pouring, in which:
Tundish upper nozzle includes crossing between steel channel and filling pipe end plate and cooperating with coincidence, filling pipe end ontology, filling pipe end on filling pipe end
Position, filling pipe end ontology are that hollow structure is equipped with inner cavity, and filling pipe end is set to the upper end of filling pipe end ontology with coincidence, and filling pipe end crosses steel
Channel is set in the inner cavity of filling pipe end ontology, is set to the bottom end of filling pipe end ontology between filling pipe end plate with coincidence；
Porous tundish lower nozzle includes between being lauched oralia with coincidence, collector nozzle ontology, slag line and discharge hole, and collector nozzle ontology is
Hollow structure is equipped with inner cavity, the upper end of collector nozzle ontology is equipped be lauched oralia between with coincidence, on the outer wall in the middle part of collector nozzle ontology
Equipped with slag line, discharge hole, lower discharge hole and bottom discharge hole are wrapped in discharge hole, and the two sides of collector nozzle ontology lower end are respectively symmetrically set
It is equipped with discharge hole and lower discharge hole, the bottom of collector nozzle ontology is in being provided with bottom discharge hole in vertical direction；
(2) process of pouring is opened
Slab is opened pour before argon gas is filled with into tundish, inflationtime maintains 5min or more, opens when pouring preparation, routinely casts
While method arranges iron filings and spring cold burden, the spring upper horizontal of heart position places one block of steel plate, adjustment in a crystallizer
When the mouth of a river of tundish, mouth of a river bottom is close to steel plate；
(3) continuous casting process takes whole process protection to be poured
Ladle seals molding casting using long nozzle argon to tundish, and tundish to crystallizer is using the upper and lower mouth of a river cooperation of tundish
Molding casting, Metal in Tundish use alkaline covering agent covering protection；
(4) Mold surface be laid with covering slag main component by mass percentage are as follows:
CaO:32-38%, SiO2 : 28-31%, Al2O3: 3-6%, 0% < Fe2O3≤ 3%, H2O≤0.5%, full C:2.5-6.5%,
Na2O:5-9%, F-: 5-9%, the sum of the above components are 100%；
(5) steel pouring process
Keep the control of steel liquid fluctuating within ± 3mm, the liquid slag layer control nearby of crystallizer leptoprosopy is in 8-12mm.
The technical solution that the present invention further limits is:
Further, in the continuous casting manufacturing technique of the aforementioned generous section pipe line steel slab of production, filling pipe end crosses steel vias inner walls and is in
Ladder gradual change type structure.
The tundish upper nozzle in the straight barrel type channel that original process use is changed in ladder gradual change in the present invention by technical effect
Formula structure channel tundish upper nozzle, the molten steel stream plume that can stablize in tundish to crystallizer channel are dynamic.
In the continuous casting manufacturing technique of the aforementioned generous section pipe line steel slab of production, the measurement that step (1) opens the condition of pouring is specific
Are as follows: Continuous Temperature Measurement of Liquid Steel in CC Tundish systematic survey tundish internal temperature is utilized, is detected under tundish using contact type thermometric indicator
Mouth of a river outside wall temperature.
In the continuous casting manufacturing technique of the aforementioned generous section pipe line steel slab of production, baking time when step (1) is toasted online
For 150min, tundish internal temperature is 1200 DEG C, and tundish lower nozzle temperature is 1100 DEG C.
In the continuous casting manufacturing technique of the aforementioned generous section pipe line steel slab of production, upper discharge hole and lower discharge hole are with certain angle
Degree tilts down to form inclined angle alpha, and inclined angle alpha is 5-30 °.
In the continuous casting manufacturing technique of the generous section pipe line steel slab of aforementioned production, step (3) neutral and alkali coverture it is main
Ingredient is by mass percentage are as follows: CaO: >=45%, SiO2 :≤12%, Al2O3: 30-38%, Fe2O3≤ 1.2%, H2O≤0.5%,
Gu C:< 1.0%, F-: < 0.5%, the sum of the above components are 100%.
In the continuous casting manufacturing technique of the aforementioned generous section pipe line steel slab of production, the slab size of production: with a thickness of 260mm
Or 320mm, width 1600-2800mm.
In the continuous casting manufacturing technique of the aforementioned generous section pipe line steel slab of production, the binary for the covering slag that step (4) is laid with
Basicity: 1.03-1.36, viscosity: 1.3-1.6 poise.
The beneficial effects of the present invention are:
Technical effect, step (2) of the present invention open pour during, one block of steel plate of the spring upper horizontal of heart position in a crystallizer
Since a vertical bottom discharge hole is arranged at porous tundish lower nozzle bottom, dummy bar head can directly be impacted by holding molten steel when pouring,
One block of steel plate is placed above the spring of crystallizer center, and ensures that steel plate is horizontal positioned, and when adjusting the mouth of a river, mouth of a river bottom is leaned on
Nearly steel plate prevents bottom impact splash.
Filling pipe end is crossed steel vias inner walls in ladder gradual change type structure by the present invention, while the double-side-hole that original process are used soaks
Enter the formula mouth of a river and be optimized for porous tundish lower nozzle, i.e., respectively increases the discharge for being centainly angled downward angle in mouth of a river two sides
Hole increases the discharge hole of vertical direction in mouth of a river bottom, after molten steel stream stock is flowed out from side discharge hole, twice stream stock phase interaction
With, crystallizer internal upper part flow field can be enlivened, covering slag fusing is promoted, the melt cinder of adequate thickness is provided, the outflow of bottom discharge hole
Vertical current stock inhibits molten steel at left and right sides of crystallization flow field to be biased to other side flowing, i.e. stream stock Biased flow phenomenon, reduces slag phenomenon hair
It is raw, pipe line steel cleanliness is improved, and then rear steel plate inspection qualification rate is rolled in raising and the qualified ratio of field trash grading, reduction are rolled
The unplanned amount of steel improves contract encashment ratio；Original process are compared, flaw detection qualification rate is to be improved by 91.10% to 98.12%, 1.5 grade to press from both sides
Qualified ratio of sundries grading is improved by 85.27% to 97.17%.
Detailed description of the invention
Fig. 1 is the cross-sectional view of tundish upper nozzle in the embodiment of the present invention；
Fig. 2 is the cross-sectional view of porous tundish lower nozzle in the embodiment of the present invention；
Wherein: matching coincidence, 2- filling pipe end ontology on 1- filling pipe end, 3- filling pipe end crosses steel channel, matches coincidence, 5- between 4- filling pipe end plate
It is lauched between oralia with coincidence, 6- collector nozzle ontology, 7- slag line, spue hole on 8-, and spue hole under 9-, the bottom 10- discharge hole.
Specific embodiment
Embodiment 1
A kind of continuous casting manufacturing technique producing generous section pipe line steel slab provided in this embodiment, comprises the following specific steps that:
(1) online baking
Tundish upper nozzle is embedded in tundish bottom, installs porous tundish lower nozzle below tundish, starts to pour in casting machine
Before casting, tundish and porous collector nozzle are toasted online, baking time 150min utilizes Continuous Temperature Measurement of Liquid Steel in CC Tundish system
(model BCT-V) amount of uniting tundish internal temperature is 1200 DEG C, detects tundish lower nozzle outer wall using contact type thermometric indicator
Temperature is 1100 DEG C, reaches and opens the condition of pouring, in which:
Tundish upper nozzle includes crossing between steel channel 3 and filling pipe end plate and matching with coincidence 1, filling pipe end ontology 2, filling pipe end on filling pipe end
Coincidence 4, filling pipe end ontology 2 are that hollow structure is equipped with inner cavity, and filling pipe end is set to the upper end of filling pipe end ontology 2, upper water with coincidence 1
Steel channel 3 of making a slip of the tongue is set in the inner cavity of filling pipe end ontology 2, and it is for example attached in ladder gradual change type structure that filling pipe end crosses 3 inner wall of steel channel
Fig. 1 " Christmas tree " shape, the bottom end of filling pipe end ontology 2 is set between filling pipe end plate with coincidence 4, and structure is as shown in Figure 1；
Porous tundish lower nozzle includes between being lauched oralia with coincidence 5, collector nozzle ontology 6, slag line 7 and discharge hole, collector nozzle sheet
Body 6 is that hollow structure is equipped with inner cavity, the upper end of collector nozzle ontology 6 is equipped be lauched oralia between with coincidence 5,6 middle part of collector nozzle ontology
Outer wall be equipped with slag line 7, discharge hole wraps discharge hole 8, lower discharge hole 9 and bottom discharge hole 10,6 lower end of collector nozzle ontology
Two sides have been symmetrically arranged discharge hole 8 and lower discharge hole 9, and the bottom of collector nozzle ontology 6 is in being provided with bottom in vertical direction
Portion discharge hole 10, upper discharge hole 8 and lower discharge hole 9 tilt down to form inclined angle alpha at a certain angle, and inclined angle alpha is 5 °, structure
As shown in Figure 2；
(2) process of pouring is opened
Slab is opened pour before be filled with argon gas into tundish, inflationtime 10min is opened when pouring preparation, and routinely casting method is arranged
While iron filings and spring cold burden, the spring upper horizontal of heart position places one piece of 300mm × 260mm × 20mm in a crystallizer
Specification steel plate, when adjusting the mouth of a river of tundish, mouth of a river bottom is close to steel plate；
(3) continuous casting process takes whole process protection to be poured
Ladle seals molding casting using long nozzle argon to tundish, and tundish to crystallizer is using the upper and lower mouth of a river cooperation of tundish
Molding casting, Metal in Tundish use alkaline covering agent covering protection, and the main component of alkaline covering agent is by mass percentage are as follows:
CaO: >=45%, SiO2 :≤12%, Al2O3: 30-38%, Fe2O3≤ 1.2%, H2O≤0.5%, Gu C:< 1.0%, F-: <
0.5%, the sum of the above components are 100%；
(4) Mold surface be laid with covering slag main component by mass percentage are as follows:
CaO:32-38%, SiO2 : 28-31%, Al2O3: 3-6%, 0% < Fe2O3≤ 3%, H2O≤0.5%, full C:2.5-6.5%,
Na2O:5-9%, F-: 5-9%, the sum of the above components are 100%, the dual alkalinity of covering slag: 1.03-1.36, viscosity: 1.3-1.6
poise；
(5) steel pouring process
Keep the control of steel liquid fluctuating within ± 3mm, the liquid slag layer control nearby of crystallizer leptoprosopy is in 10mm.
The present embodiment produces casting blank specification: with a thickness of 260mm, width 2770mm.
It is 98.53% that the present embodiment production slab, which rolls rear steel plate inspection qualification rate, and 1.5 grades of qualified ratios of field trashes grading are
97.33%。
Embodiment 2
A kind of continuous casting manufacturing technique producing generous section pipe line steel slab provided in this embodiment, comprises the following specific steps that:
(1) online baking
Tundish upper nozzle is embedded in tundish bottom, installs porous tundish lower nozzle below tundish, starts to pour in casting machine
Before casting, tundish and porous collector nozzle are toasted online, baking time 180min, using tundish in continuous measurement of molten steel temperature
It is 1220 DEG C that system (model BCT-V), which measures tundish internal temperature, detects tundish lower nozzle using contact type thermometric indicator
Outside wall temperature is 1150 DEG C, reaches and opens the condition of pouring, in which:
Tundish upper nozzle includes crossing between steel channel 3 and filling pipe end plate and matching with coincidence 1, filling pipe end ontology 2, filling pipe end on filling pipe end
Coincidence 4, filling pipe end ontology 2 are that hollow structure is equipped with inner cavity, and filling pipe end is set to the upper end of filling pipe end ontology 2, upper water with coincidence 1
Steel channel 3 of making a slip of the tongue is set in the inner cavity of filling pipe end ontology 2, and it is for example attached in ladder gradual change type structure that filling pipe end crosses 3 inner wall of steel channel
Fig. 1 " Christmas tree " shape, the bottom end of filling pipe end ontology 2 is set between filling pipe end plate with coincidence 4, and structure is as shown in Figure 1；
Porous tundish lower nozzle includes between being lauched oralia with coincidence 5, collector nozzle ontology 6, slag line 7 and discharge hole, collector nozzle sheet
Body 6 is that hollow structure is equipped with inner cavity, the upper end of collector nozzle ontology 6 is equipped be lauched oralia between with coincidence 5,6 middle part of collector nozzle ontology
Outer wall be equipped with slag line 7, discharge hole wraps discharge hole 8, lower discharge hole 9 and bottom discharge hole 10,6 lower end of collector nozzle ontology
Two sides have been symmetrically arranged discharge hole 8 and lower discharge hole 9, and the bottom of collector nozzle ontology 6 is in being provided with bottom in vertical direction
Portion discharge hole 10, upper discharge hole 8 and lower discharge hole 9 tilt down to form inclined angle alpha at a certain angle, and inclined angle alpha is 30 °, knot
Structure is as shown in Figure 2；
(2) process of pouring is opened
Slab is opened pour before argon gas is filled with into tundish, inflationtime maintains 5min or more, opens when pouring preparation, routinely casts
Method arranges iron filings and while spring cold burden, in a crystallizer the spring upper horizontal of heart position place one piece of 350mm ×
320mm × 20mm specification steel plate, when adjusting the mouth of a river of tundish, mouth of a river bottom is close to steel plate；
(3) continuous casting process takes whole process protection to be poured
Ladle seals molding casting using long nozzle argon to tundish, and tundish to crystallizer is using the upper and lower mouth of a river cooperation of tundish
Molding casting, Metal in Tundish use alkaline covering agent covering protection, and the main component of alkaline covering agent is by mass percentage are as follows:
CaO: >=45%, SiO2 :≤12%, Al2O3: 30-38%, Fe2O3≤ 1.2%, H2O≤0.5%, Gu C:< 1.0%, F-: <
0.5%, the sum of the above components are 100%；
(4) Mold surface be laid with covering slag main component by mass percentage are as follows:
CaO:32-38%, SiO2 : 28-31%, Al2O3: 3-6%, 0% < Fe2O3≤ 3%, H2O≤0.5%, full C:2.5-6.5%,
Na2O:5-9%, F-: 5-9%, the sum of the above components are 100%, it is desirable that dual alkalinity: 1.03-1.36, viscosity: 1.3-1.6
poise；
(5) steel pouring process
Keep the control of steel liquid fluctuating within ± 3mm, the liquid slag layer control nearby of crystallizer leptoprosopy is in 12mm.
The present embodiment produces casting blank specification: with a thickness of 320mm, width 2770mm.
It is 98.78% that the present embodiment production slab, which rolls rear steel plate inspection qualification rate, and 1.5 grades of qualified ratios of field trashes grading are
98.11%。
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (8)
1. a kind of continuous casting manufacturing technique for producing generous section pipe line steel slab, which is characterized in that comprise the following specific steps that:
(1) online baking
Tundish upper nozzle is embedded in tundish bottom, installs porous tundish lower nozzle below tundish, starts to pour in casting machine
Before casting, tundish and porous collector nozzle are toasted online, baking time >=120min, when tundish temperature >=1100 DEG C and
Less than 1250 DEG C, while tundish lower nozzle temperature >=1000 DEG C and then reaching less than 1200 DEG C and opens the condition of pouring, in which:
The tundish upper nozzle include on filling pipe end with coincidence (1), filling pipe end ontology (2), filling pipe end cross steel channel (3) and on
Match coincidence (4) between water gap plate, the filling pipe end ontology (2) is that hollow structure is equipped with inner cavity, and the filling pipe end is arranged with coincidence (1)
In the upper end of the filling pipe end ontology (2), the filling pipe end crosses the inner cavity that steel channel (3) is set to the filling pipe end ontology (2)
In, the bottom end of the filling pipe end ontology (2) is set between the filling pipe end plate with coincidence (4)；
The porous tundish lower nozzle includes between being lauched oralia with coincidence (5), collector nozzle ontology (6), slag line (7) and discharge
Hole, the collector nozzle ontology (6) are that hollow structure is equipped with inner cavity, and the upper end of the collector nozzle ontology (6) is equipped with the collector nozzle
Match coincidence (5) between plate, the outer wall in the middle part of the collector nozzle ontology (6) is equipped with the slag line (7), and discharge is wrapped in the discharge hole
The two sides in hole (8), lower discharge hole (9) and bottom discharge hole (10), collector nozzle ontology (6) lower end are symmetrically arranged
State discharge hole (8) and lower discharge hole (9), the bottom of the collector nozzle ontology (6) is in being provided with the bottom in vertical direction
Discharge hole (10)；
(2) process of pouring is opened
Slab is opened pour before argon gas is filled with into tundish, inflationtime maintains 5min or more, opens when pouring preparation, routinely casts
While method arranges iron filings and spring cold burden, the spring upper horizontal of heart position places one block of steel plate, adjustment in a crystallizer
When the mouth of a river of tundish, mouth of a river bottom is close to steel plate；
(3) continuous casting process takes whole process protection to be poured
Ladle seals molding casting using long nozzle argon to tundish, and tundish to crystallizer is using the upper and lower mouth of a river cooperation of tundish
Molding casting, Metal in Tundish use alkaline covering agent covering protection；
(4) Mold surface be laid with covering slag main component by mass percentage are as follows:
CaO:32-38%, SiO2 : 28-31%, Al2O3: 3-6%, 0% < Fe2O3≤ 3%, H2O≤0.5%, full C:2.5-6.5%,
Na2O:5-9%, F-: 5-9%, the sum of the above components are 100%；
(5) steel pouring process
Keep the control of steel liquid fluctuating within ± 3mm, the liquid slag layer control nearby of crystallizer leptoprosopy is in 8-12mm.
2. the continuous casting manufacturing technique of the generous section pipe line steel slab of production according to claim 1, it is characterised in that: described
Filling pipe end crosses steel channel (3) inner wall in ladder gradual change type structure.
3. the continuous casting manufacturing technique of the generous section pipe line steel slab of production according to claim 1, it is characterised in that: step
(1) measurement for the condition of pouring is opened specifically: utilize Continuous Temperature Measurement of Liquid Steel in CC Tundish systematic survey tundish internal temperature, utilize contact
Formula temperature measurer detects tundish lower nozzle outside wall temperature.
4. the continuous casting manufacturing technique of the generous section pipe line steel slab of production according to claim 1, it is characterised in that: described
Baking time is 150min when step (1) is toasted online, and tundish internal temperature is 1200 DEG C, and tundish lower nozzle temperature is
1100℃。
5. the continuous casting manufacturing technique of the generous section pipe line steel slab of production according to claim 1, it is characterised in that: described
Upper discharge hole (8) and lower discharge hole (9) tilt down to form inclined angle alpha at a certain angle, and the inclined angle alpha is 5-30 °.
6. the continuous casting manufacturing technique of the generous section pipe line steel slab of production according to claim 1, it is characterised in that: step
(3) main component of alkaline covering agent described in is by mass percentage are as follows: CaO: >=45%, SiO2 :≤12%, Al2O3: 30-
38%, Fe2O3≤ 1.2%, H2O≤0.5%, Gu C:< 1.0%, F-: < 0.5%, the sum of the above components are 100%.
7. the continuous casting manufacturing technique of the generous section pipe line steel slab of production according to claim 1, it is characterised in that: production
Slab size: with a thickness of 260mm or 320mm, width 1600-2800mm.
8. the continuous casting manufacturing technique of the generous section pipe line steel slab of production according to claim 1, it is characterised in that: step
(4) dual alkalinity for the covering slag being laid with: 1.03-1.36, viscosity: 1.3-1.6 poise.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109648068A (en) * | 2019-01-29 | 2019-04-19 | 大冶特殊钢股份有限公司 | A kind of induction heating tundish ladle canal and its means of defence |
| CN111618289A (en) * | 2020-05-19 | 2020-09-04 | 浙江自立高温科技股份有限公司 | Upper nozzle and tundish |
| CN112935214A (en) * | 2021-02-09 | 2021-06-11 | 鞍钢股份有限公司 | Method for distinguishing flow field bias flow in crystallizer |
| CN115338377A (en) * | 2022-07-27 | 2022-11-15 | 南京钢铁股份有限公司 | Preparation method of casting blank |
| CN116117087A (en) * | 2022-12-27 | 2023-05-16 | 河南科技大学 | Crystallizer, continuous casting device and method for determining solid-liquid interface position |
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| CN109648068A (en) * | 2019-01-29 | 2019-04-19 | 大冶特殊钢股份有限公司 | A kind of induction heating tundish ladle canal and its means of defence |
| CN111618289A (en) * | 2020-05-19 | 2020-09-04 | 浙江自立高温科技股份有限公司 | Upper nozzle and tundish |
| CN112935214A (en) * | 2021-02-09 | 2021-06-11 | 鞍钢股份有限公司 | Method for distinguishing flow field bias flow in crystallizer |
| CN115338377A (en) * | 2022-07-27 | 2022-11-15 | 南京钢铁股份有限公司 | Preparation method of casting blank |
| CN116117087A (en) * | 2022-12-27 | 2023-05-16 | 河南科技大学 | Crystallizer, continuous casting device and method for determining solid-liquid interface position |
| CN116117087B (en) * | 2022-12-27 | 2024-04-23 | 河南科技大学 | Crystallizer, continuous casting device and method for determining solid-liquid interface position |
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Application publication date: 20181218 |