CN108637195A - Prevent the continuous casting process of the nearly surface layer gas hole defect of continuous casting billet - Google Patents
Prevent the continuous casting process of the nearly surface layer gas hole defect of continuous casting billet Download PDFInfo
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- CN108637195A CN108637195A CN201810373042.8A CN201810373042A CN108637195A CN 108637195 A CN108637195 A CN 108637195A CN 201810373042 A CN201810373042 A CN 201810373042A CN 108637195 A CN108637195 A CN 108637195A
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- continuous casting
- steam
- crystallizer
- insertion depth
- defect
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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
- B22D11/10—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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
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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
- B22D41/14—Closures
- B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
- B22D41/18—Stopper-rods therefor
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Revetment (AREA)
- Continuous Casting (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a kind of continuous casting process preventing the nearly surface layer gas hole defect of continuous casting billet, protect steam at crystallizer cover board, prevent steam from entering crystallizer；0.5~1.0mm of granularity of used covering slag accounts for 50wt% or more, moisture≤0.4wt%；It such as uses the control of sunken bottom submersed nozzle insertion depth in 105~155mm, is such as controlled in 140~145mm using flat concave bottom submersed nozzle insertion depth；It is poured into a mould using unitary solid stopper.This technique is by protecting steam, the selection of covering slag, the control of mouth of a river insertion depth and using solid stopper; the generation of continuous casting billet subcutaneous blowhole, needle pore defect is effectively prevented, to reduce mass loss and cleaning process cost caused by subcutaneous blowhole defect；It is good with slab quality, the features such as saving cleaning up cost, improve hot sending ratio, energy conservation and environmental protection.
Description
Technical field
The invention belongs to continuous-casting steel pouring technical field, especially a kind of continuous casting work preventing the nearly surface layer gas hole defect of continuous casting billet
Skill.
Background technology
For a long time, sheet billet continuous casting has recovery rate of iron high, and energy consumption is low, and slab quality is good, mechanization, automation
The features such as degree is high, it has also become the commonplace continuous casting process of present iron and steel enterprise.But with the gradual transformation of Market Situation,
Requirement of the user to product quality is increasingly stringenter, and the slow rhythm production model that originally casting blank defect is cleared up, checked on, letting pass again is
Fast pace of today, high quality of production requirement cannot be met.The especially big thickness section of continuous casting billet is since pulling rate is relatively low, initial base
Shell residence time in crystallizer is long, the argon that the gas for generation of burning in covering slag, steam, the stopper of casting process generation are blown into
The bubbles such as gas are easy to be captured, and cannot appear meniscus, and the nearly surface layer of strand is caused to have subcutaneous blowhole defect.Since continuous casting is wide
Metric lattice are more, cause the depth of stomata position, substep width irregular, and cleaning is difficult；Strand circulation is slow, to follow-up
Hidden danger of quality, production cost input etc. make a big impact；And largely cleaning can derive the operations such as some folding, slags
Property steel plate defect.
Invention content
The technical problem to be solved in the present invention is to provide a kind of good companies for preventing the nearly surface layer gas hole defect of continuous casting billet of effect
Casting process.
In order to solve the above technical problems, the technical solution used in the present invention is：Steam at crystallizer cover board is prevented
Shield, prevents steam from entering crystallizer；0.5~1.0mm of granularity of used covering slag account for 50wt% or more, moisture≤
0.4wt%；It such as uses the control of sunken bottom submersed nozzle insertion depth in 105~155mm, is such as inserted using flat concave bottom submersed nozzle
Enter deep-controlled in 140~145mm；It is poured into a mould using unitary solid stopper.
Thickness≤300mm, the width≤2400mm of continuous casting billet of the present invention.
It is using advantageous effect caused by above-mentioned technical proposal：The present invention by protect steam, covering slag selection,
The control of mouth of a river insertion depth and the solid stopper of use, effectively prevent the generation of continuous casting billet subcutaneous blowhole, needle pore defect,
To reduce mass loss and cleaning process cost caused by subcutaneous blowhole defect；It is good with slab quality, save cleaning
The features such as expense, raising hot sending ratio, energy conservation and environmental protection.
Specific implementation mode
The present invention will be further described in detail with reference to the specific embodiments.
Originally prevent the continuous casting process of the nearly surface layer gas hole defect of continuous casting billet from using following techniques：
（1）Steam at crystallizer cover board is protected, prevents steam from entering crystallizer；The steam refers in crystallizer
Generated a large amount of steam when the 0# fan-shaped section water-spraying control strands of lower section can scurry into crystallizer under aerostatic buoyancy effect.It can
Using following means：1）, minor flaps are in often to pour time will be sealed with rock wool, cause covering slag to prevent steam to be passed through crystallizer
It makes moist；The lower rock wool of minor flaps is wrapped up with plastic film simultaneously, to reduce the occurrence probability of infiltration.2）, cast when steamed
Vapour guides, and steam is imported the position far from crystallizer by steam diversion, steam is prevented to be involved in crystallizer.Steam guides
Purposive that excess steam is discharged into the position far from mold liquid level, mode has：A, by the way that existing steaming exhaust blower pipe is transformed
Road and suction opening position, enhancing steam extraction, exhaust effect；Such as under the premise of existing crystallizer constructs Foundation without changing, original is steamed
Exhaust blower suction opening position changes to the 0-1# fan-shaped sections closer to steam generation, while pipeline overstriking, improves exhaust effect, increases
Practical pumping efficiency；B, it carries out steam by the way of the trepanning of designated position on existing crystallizer large cover to dredge, extra
Steam is excluded by hole, to achieve the purpose that steam is avoided to be scurried near crystallizer.The steaming exhaust blower refers to taking out
Be dispersed in 0 section it is cooling when produced steam a kind of equipment, can cause when power is inadequate or layout of beam line is unreasonable steam without
Method empties.
（2）It is preferred that covering slag：The covering slag when being the pour steel in crystallizer, is covered in above molten steel face
A kind of solid particle, purpose form melt cinder substep on newborn green shell surface after having fusing, lubricating action are played in crystallizer；
It can also promote to conduct heat, play cooling instrumentality；Molten steel in mold can also be kept the temperature and be protected, prevent molten steel direct
Ingress of air secondary oxidation and solidification.0.5~1.0mm of covering slag granularity accounting examples 50wt% or more in this technique, in covering slag
Moisture≤0.4wt%；This covering slag gas permeability is preferable, and mold liquid level is stablized when cast, the C-O products for generation of burning
Burning can be discharged in time.
（3）Insertion depth technique is optimized, the discharge hole of submersed nozzle is inserted into crystallizer in liquid level could be steady
Fixed, safety, insertion depth refer to the height of liquid level in the upper edge to crystallizer of submersed nozzle discharge hole, and the size of insertion depth is direct
Influence flow field of the steel stream in crystallizer.Technique is as follows：When using sunken bottom submersed nozzle, insertion depth control 105~
155mm；When using flat concave bottom submersed nozzle, insertion depth is controlled in 140~145mm.Above-mentioned insertion depth technique, increases
Bubble emersion surface probability, improves air blister defect in crystallizer.The sunken bottom and concave bottom refers to submersed nozzle bottom shape
Shape, it decides steel trajectory mark when steel stream is flowed out from submersed nozzle.
（4）It is poured into a mould using unitary solid stopper, in this way, reducing part bubble source after closing stopper argon gas.Institute
State stopper be tundish to crystallizer pouring molten steel when flow control device, solid stopper refers to not having channel inside stopper, is not necessarily to
It is passed through argon gas.
（5）Above-mentioned technique be suitable for continuous casting 300mm thickness, width 2400mm and within most of steel grade, such as P20,
Extremely more steel grades such as 718, face hydrogen SA387Gr11Cl1, face hydrogen 14Cr1MoR, quenching and tempering, high, low-alloy series.Using above-mentioned work
After skill, by annual benefit calculation, according to report display data, about 600 tons outside the plan of surface, mass loss per ton are monthly reduced
About 1000 yuan, mass loss 7,200,000 can be reduced every year, monthly reduce about 2.5 ten thousand tons of cleaning amount, the cleaning process energy+people per ton
About 10 yuan of work cost, annual cost-effective 3,000,000.Total cost-effective 10,200,000 yuan of energy every year.
Embodiment 1：Originally prevent the continuous casting process of the nearly surface layer gas hole defect of continuous casting billet described in detail below.
Continuous casting 300mm thickness, width 2400mm face hydrogen SA387Gr11Cl1 steel billets, and continuous casting process is as follows：Crystallizer is small
Secondary sealed with rock wool is often poured at cover board to prevent, while is wrapped up with plastic film rock wool under minor flaps；Steam is carried out when cast to draw
It leads.0.5~1.0mm of used covering slag granularity accounts for 60%, moisture 0.3%.Use sunken bottom submersed nozzle, insertion depth control
System is in 125mm.It is poured into a mould using unitary solid stopper.Showing for cast gained continuous casting billet is smooth, is lacked without subcutaneous blowhole, pin hole
It falls into, quality is good.
Embodiment 2：Originally prevent the continuous casting process of the nearly surface layer gas hole defect of continuous casting billet described in detail below.
The P20 steel billets of continuous casting 250mm thickness, width 2200mm, continuous casting process are as follows：Time use is often poured at crystallizer minor flaps
Rock wool sealing prevents, while is wrapped up with plastic film rock wool under minor flaps；Steam guiding is carried out when cast.Used covering slag
Granularity 0.5~1.0mm accountings example 52%, moisture 0.4%.Using sunken bottom submersed nozzle, insertion depth is controlled in 105mm.
It is poured into a mould using unitary solid stopper.Cast gained continuous casting billet show it is smooth, without subcutaneous blowhole, needle pore defect, quality is good
It is good.
Embodiment 3：Originally prevent the continuous casting process of the nearly surface layer gas hole defect of continuous casting billet described in detail below.
Continuous casting 280mm thickness, width 2200mm face hydrogen 14Cr1MoR steel billets, and continuous casting process is as follows：Crystallizer minor flaps
Place often pours secondary sealed with rock wool and prevents, while is wrapped up with plastic film rock wool under minor flaps；Steam guiding is carried out when cast.Institute
Using covering slag granularity 0.5~1.0mm accountings example 50%, moisture 0.35%.Use sunken bottom submersed nozzle, insertion depth control
System is in 155mm.It is poured into a mould using unitary solid stopper.Showing for cast gained continuous casting billet is smooth, is lacked without subcutaneous blowhole, pin hole
It falls into, quality is good.
Embodiment 4：Originally prevent the continuous casting process of the nearly surface layer gas hole defect of continuous casting billet described in detail below.
718 steel billets of continuous casting 280mm thickness, width 2400mm, continuous casting process are as follows：Time use is often poured at crystallizer minor flaps
Rock wool sealing prevents, while is wrapped up with plastic film rock wool under minor flaps；Steam guiding is carried out when cast.Used covering slag
Granularity 0.5~1.0mm accountings example 55%, moisture 0.2%.Using flat concave bottom submersed nozzle, insertion depth control exists
145mm.It is poured into a mould using unitary solid stopper.Showing for cast gained continuous casting billet be smooth, without subcutaneous blowhole, needle pore defect,
Quality is good.
Embodiment 5：Originally prevent the continuous casting process of the nearly surface layer gas hole defect of continuous casting billet described in detail below.
The low-alloy Q345D steel billets of continuous casting 300mm thickness, width 2000mm, continuous casting process are as follows：At crystallizer minor flaps
Often pouring secondary sealed with rock wool prevents, while is wrapped up with plastic film rock wool under minor flaps；Steam guiding is carried out when cast.It is adopted
With covering slag granularity 0.5~1.0mm accountings example 54%, moisture 0.27%.Use flat concave bottom submersed nozzle, insertion depth control
System is in 140mm.It is poured into a mould using unitary solid stopper.Showing for cast gained continuous casting billet is smooth, is lacked without subcutaneous blowhole, pin hole
It falls into, quality is good.
Embodiment 6：Originally prevent the continuous casting process of the nearly surface layer gas hole defect of continuous casting billet described in detail below.
The quenched high-strength Q690D steel billets of continuous casting 200mm thickness, width 2100mm, continuous casting process are as follows：Crystallizer minor flaps
Place often pours secondary sealed with rock wool and prevents, while is wrapped up with plastic film rock wool under minor flaps；Steam guiding is carried out when cast.Institute
Using covering slag granularity 0.5~1.0mm accountings example 62%, moisture 0.36%.Use flat concave bottom submersed nozzle, insertion depth
Control is in 142mm.It is poured into a mould using unitary solid stopper.Cast gained continuous casting billet show it is smooth, without subcutaneous blowhole, pin hole
Defect, quality are good.
Prolonged application counts：Hebei steel mill, when being cast using conventional method, through counting, in every 100 batch, about
25 batches will appear severe pinhole defect, 10 batches will appear a small amount of needle pore defect, 65 batch no pin-hole defects.Using this technique
Later, through counting, in every 100 batch, 0 batch will appear severe pinhole defect, 5 batches will appear a small amount of needle pore defect, 95 batches
Secondary no pin-hole defect.It can be seen that this technique effectively reduces the occurrence probability of continuous casting billet needle pore defect, continuous casting billet is improved
Quality.
Claims (2)
1. a kind of continuous casting process preventing the nearly surface layer gas hole defect of continuous casting billet, it is characterised in that：To steam at crystallizer cover board into
Row protection, prevents steam from entering crystallizer；0.5~1.0mm of granularity of used covering slag accounts for 50wt% or more, moisture
≤0.4wt%；It such as uses the control of sunken bottom submersed nozzle insertion depth in 105~155mm, such as uses flat concave bottom submersed nozzle
Insertion depth is controlled in 140~145mm；It is poured into a mould using unitary solid stopper.
2. the continuous casting process according to claim 1 for preventing the nearly surface layer gas hole defect of continuous casting billet, it is characterised in that：The company
Thickness≤300mm, the width≤2400mm of strand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810373042.8A CN108637195A (en) | 2018-04-24 | 2018-04-24 | Prevent the continuous casting process of the nearly surface layer gas hole defect of continuous casting billet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810373042.8A CN108637195A (en) | 2018-04-24 | 2018-04-24 | Prevent the continuous casting process of the nearly surface layer gas hole defect of continuous casting billet |
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| CN108637195A true CN108637195A (en) | 2018-10-12 |
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| CN201810373042.8A Pending CN108637195A (en) | 2018-04-24 | 2018-04-24 | Prevent the continuous casting process of the nearly surface layer gas hole defect of continuous casting billet |
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Citations (7)
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|---|---|---|---|---|
| JPH0994634A (en) * | 1995-09-29 | 1997-04-08 | Kawasaki Steel Corp | Water cooling mold for continuous casting |
| JP2002205147A (en) * | 2000-12-28 | 2002-07-23 | Nkk Corp | Method for continuously casting steel |
| CN102699301A (en) * | 2012-06-26 | 2012-10-03 | 南京钢铁股份有限公司 | Steel continuous casting process for ultra supercritical high-pressure boiler tube |
| CN102825231A (en) * | 2012-07-31 | 2012-12-19 | 马鞍山科润冶金材料有限公司 | Crystallizer covering slag for continuously casting hot rolled steel and manufacturing method of crystallizer covering slag |
| CN104785737A (en) * | 2015-04-09 | 2015-07-22 | 山西太钢不锈钢股份有限公司 | Method for eliminating defect of metal particles on surface of continuous casting |
| CN105562641A (en) * | 2016-01-27 | 2016-05-11 | 重庆大学 | Crystallizer covering slag for continuously casting high-manganese high-aluminum steel and preparation method of crystallizer covering slag |
| CN105710328A (en) * | 2014-12-05 | 2016-06-29 | 重庆永林机械设备有限公司 | 30MnSi continuous casting process |
-
2018
- 2018-04-24 CN CN201810373042.8A patent/CN108637195A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0994634A (en) * | 1995-09-29 | 1997-04-08 | Kawasaki Steel Corp | Water cooling mold for continuous casting |
| JP2002205147A (en) * | 2000-12-28 | 2002-07-23 | Nkk Corp | Method for continuously casting steel |
| CN102699301A (en) * | 2012-06-26 | 2012-10-03 | 南京钢铁股份有限公司 | Steel continuous casting process for ultra supercritical high-pressure boiler tube |
| CN102825231A (en) * | 2012-07-31 | 2012-12-19 | 马鞍山科润冶金材料有限公司 | Crystallizer covering slag for continuously casting hot rolled steel and manufacturing method of crystallizer covering slag |
| CN105710328A (en) * | 2014-12-05 | 2016-06-29 | 重庆永林机械设备有限公司 | 30MnSi continuous casting process |
| CN104785737A (en) * | 2015-04-09 | 2015-07-22 | 山西太钢不锈钢股份有限公司 | Method for eliminating defect of metal particles on surface of continuous casting |
| CN105562641A (en) * | 2016-01-27 | 2016-05-11 | 重庆大学 | Crystallizer covering slag for continuously casting high-manganese high-aluminum steel and preparation method of crystallizer covering slag |
Non-Patent Citations (3)
| Title |
|---|
| 朱鸿民等: "《冶金研究》", 31 March 2007, 北京冶金工业出版社 * |
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Application publication date: 20181012 |
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