WO2017052030A1 - 주편의 연속 주조 방법 - Google Patents
주편의 연속 주조 방법 Download PDFInfo
- Publication number
- WO2017052030A1 WO2017052030A1 PCT/KR2016/005922 KR2016005922W WO2017052030A1 WO 2017052030 A1 WO2017052030 A1 WO 2017052030A1 KR 2016005922 W KR2016005922 W KR 2016005922W WO 2017052030 A1 WO2017052030 A1 WO 2017052030A1
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- WIPO (PCT)
- Prior art keywords
- cast
- immersion nozzle
- pair
- cast steel
- mold
- Prior art date
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Classifications
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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
- B22D11/055—Cooling the 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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
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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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
- B22D11/1246—Nozzles; Spray heads
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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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
- B22D11/1282—Vertical casting and curving the cast stock to the horizontal
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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
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
Definitions
- the present invention relates to a method of continuous casting of cast steels, and more particularly, to a continuous casting method of cast steel for controlling the position of segregation and shrinkage holes occurring inside the cast steel.
- steel mills use molten steel produced through the iron making process and the steelmaking process to produce cast iron, which is a semi-finished product in the continuous casting process, and the produced cast steel is produced in a coil of a thickness desired by the consumer in the rolling process.
- FIG. 1 is a view schematically showing a general playing equipment
- Figure 2 is a schematic diagram showing the solidification structure of the cast steel produced in the general playing equipment.
- the molten steel 1 refined in the steelmaking process is placed in the ladle 10 and moved to the continuous casting factory, and then placed on the top of the tundish 20.
- the molten steel 1 accommodated in the ladle 10 is injected into the tundish 20 through the shroud nozzle 11, and the molten steel 1 injected from the tundish 20 is immersed through the immersion nozzle 21. It is continuously injected into the mold 30.
- the molten steel 1 supplied to the mold 30 is first cooled while passing through the mold 30 and then drawn out and pressed by a plurality of segment rolls 40, and is mainly cooled by the cooling water sprayed between the rolls and the rolls. As a result, it is made into a slab (2).
- the thus continuously cast slab 2 is cut into a predetermined length by the cutter 50, and is transferred to a rolling process, which is a subsequent process, by the transfer roller 60.
- defects of the slab 2 remain after rolling, causing a failure.
- defects of the slab 2 include a solidification shrinkage hole and a central segregation occurring in the central portion in the thickness direction of the cast as shown in FIG.
- the tensile stress is generated in the center of the thickness of the slab during the thick plate rolling / cooling process.
- the surface of the cast iron drops in temperature faster than the center portion, and this temperature difference causes the thickness center of the cast steel to be under tensile stress.
- the thicker the thickness of the cast the greater the tensile stress due to this temperature difference, and when the tensile stress is concentrated on the segregation (4) and the solidification shrinkage hole (3), the defects in the center of the cast (2) easily expand. Resulting in product defects.
- Soft reduction is a representative technique for reducing defects such as central segregation (4) and solidification shrinkage holes (3) causing product defects.
- the technique under light pressure imparts a pressing force to the slab 2 by the segment roll 40 during continuous casting.
- the solidification shrinkage hole 3 is physically compressed.
- the central segregation 4 is generated in the cast steel 2. Will be suppressed.
- this low pressure technique requires a large-scale reduction equipment to be installed in the player, and the pressure reduction is performed at the end of the solidification, so that the segregation 4 and the solidification shrinkage hole 3 cannot be sufficiently removed.
- the discharge nozzle structure of the immersion nozzle 21, in particular, the immersion nozzle 21 is improved, and the cooling water sprinkling control in the secondary cooling zone. Etc.
- these methods are aimed at suppressing the generation of the central segregation 4 and the solidification shrinkage hole 3, but there is a problem that the central segregation 4 and the solidification shrinkage hole 3 cannot be completely removed.
- the present invention provides a continuous casting method of the cast steel to control the position of segregation and shrinkage holes generated inside the cast steel by changing the position of the immersion nozzle for supplying molten steel to the mold.
- a continuous casting method of a cast steel comprises the steps of first cooling by molten steel while injecting molten steel from the center of the mold to the eccentric region in the thickness direction of the cast steel; Drawing a slab to be primarily cooled by the mold, and sprinkling the cooling water on the surface thereof to perform second cooling.
- the immersion nozzle is introduced into the mold consisting of a pair of long sides and a pair of short sides disposed opposite to each other to inject molten steel, and the immersion nozzle is any one selected from a pair of long sides. It is characterized by being eccentric in the long side direction.
- the cast piece is drawn downward from the mold and bent forward, and in the primary cooling step, the immersion nozzle is eccentric in a direction in which the cast piece is drawn out of a pair of long sides. Characterized in that it is a long side direction disposed in front of the reference.
- the difference between the distance d1 between the immersion nozzle and the long side selected from the pair of long sides and the distance d2 between the immersion nozzle and the other long side of the pair of long sides is 20 mm or more. It is done.
- the distance d1 between the immersion nozzle and the long side selected from the pair of long sides and the distance d2 between the immersion nozzle and the other long side of the pair of long sides are each 10 mm or more. do.
- the slab is drawn downward in the mold and bent forward, and the amount of cooling water sprayed on the lower part of the slab is sprayed on the upper part of the slab until the drawn slab is completely solidified. It maintains more, and from the time point after the cast slab is completely solidified is characterized in that the amount of cooling water sprayed on the lower portion of the slab is kept more than or equal to the amount of cooling water sprayed on the upper portion of the cast steel.
- the position of the immersion nozzle disposed inside the mold by injecting molten steel into the eccentric region of the cast steel, not the center of the mold, the position of the segregation and solidification shrinkage hole of the cast steel There is an effect that can be moved from the center to the surface direction.
- the segregation and coagulation shrinkage holes are moved in the surface direction, the coagulation shrinkage holes are more easily compressed during the rolling process of the cast steel, and the cracks do not exist in the position where the maximum tensile stress occurs during the cooling process after rolling. By preventing the propagation of the product, the internal defect of the final product is reduced.
- FIG. 1 is a view schematically showing a general playing equipment
- Figure 2 is a schematic diagram showing the solidification structure of the cast steel produced in a typical playing equipment
- Figure 3a is a view showing the position of the immersion nozzle in the mold in a typical playing equipment
- Figure 3b is a view showing that the position of the immersion nozzle inside the mold is applied to the continuous casting method of the cast steel according to an embodiment of the present invention
- FIG. 7 is a schematic diagram showing the central segregation and the stress distribution remaining in the product.
- Figure 3a is a view showing the position of the immersion nozzle in the mold in a typical playing equipment
- Figure 3b is a view showing that the position of the immersion nozzle in the mold applied to the continuous casting method of the cast steel according to an embodiment of the present invention is changed
- 4 is a flow and temperature analysis results for molten steel in a mold to which the continuous casting method of the cast steel according to an embodiment of the present invention
- Figure 5 is manufactured according to the continuous casting method of the cast steel according to an embodiment of the present invention
- Figure 6 is a photograph of the cast
- Figure 6 is a result of the compression simulation according to the location of the solidification shrinkage during rolling
- Figure 7 is a schematic diagram showing the central segregation and stress distribution remaining in the product.
- the continuous casting method of the cast steel according to an embodiment of the present invention is carried out using the general playing equipment shown in FIG.
- by changing the position of the immersion nozzle 21 for injecting the molten steel 1 accommodated in the tundish 20 into the mold 30 is achieved by changing the position where the molten steel 1 is injected into the mold 30.
- the continuous casting method of the cast steel according to an embodiment of the present invention is largely injected into the mold 30 while injecting the molten steel (1) from the center of the mold 30 to the eccentric region in the thickness direction of the cast steel (2) Primary cooling by; Drawing the slab 2 which is first cooled by the mold 30 and sprinkling the cooling water on the surface thereof to perform second cooling.
- the position of the immersion nozzle 21a is changed to the mold 30 as shown in FIG. 3A.
- the position of the immersion nozzle 21b is arranged in the eccentric region of the cast piece 2 in the width direction as shown in FIG.
- the mold 30 includes a pair of long sides 30a and 30b disposed to face each other and a pair of short sides 30c and 30d disposed to face each other, wherein the immersion nozzle 21b includes a pair of long sides ( It is arranged to be eccentric in the direction of any one of the long sides 30a selected from 30a and 30b.
- the flow intensity (flow velocity) of the molten steel 1 in the eccentric region is induced to act larger than the other regions.
- the result as shown in FIG. 4A can be obtained.
- the red color (relatively darker area) is a region having a higher flow intensity, and has a large difference in flow velocity for each region in the bath surface, but is eccentrically injected in a region below 2 meters from the water surface. It can be seen that a stronger flow field is formed at.
- the temperature field in this region is calculated in FIG. 4 (b), and it can be seen that the temperature is different in the thickness direction similar to the flow field.
- the red color (relatively dark area) is a relatively high temperature region and the temperature difference occurs that the solidification is not occurred at the center of the thickness and is deviated in the eccentric direction. To make it possible.
- the playing equipment is arranged by bending a plurality of segment rolls 40 to be drawn while pressing the slab 2 to the lower side of the mold 30, wherein the immersion nozzle 21 is eccentric direction
- the long side 30a is disposed in front of the pair of long sides 30a and 30b based on the direction in which the slab 2 is drawn.
- the direction in which the immersion nozzle 21 is eccentric is to be the upper surface direction of the cast piece 2 to be drawn out. Accordingly, the point where the solidification is completed in the direction of the upper region than the lower region of the cast piece 2 drawn out is eccentric, so that the point where the segregation 4 and the solidification shrinkage hole 3 are generated is eccentric in the upper surface direction of the cast piece 2. .
- casting was performed while moving the immersion nozzle 21 positioned in the center of the mold 30 in the direction of the arrow.
- the distance between the immersion nozzle 21 and the long side 30a selected from the pair of long sides 30a and 30b is defined as 'd1', and the immersion nozzle 21 and the pair of long sides 30a and 30b are defined.
- the distance between the other long sides 30b is defined as 'd2'.
- the immersion nozzle 21 was arranged so that the length ratio d2 / d1 of d1 and d2 was 1, 3, 4, and 7, respectively, and then the performance was performed. At this time, as the length difference between d1 and d2 increases, it was confirmed that the position where the solidification is completed is moved in the surface direction instead of the center of thickness of the slab 2. In other words, it was confirmed that the solidification shrinkage hole 3 and the segregation 4 move in the surface direction instead of the center of thickness.
- the difference between d1 and d2 is more than 20mm, otherwise the location of segregation (4) and solidification shrinkage hole (3) does not deviate much from the center of thickness of cast steel (2) to improve the quality of the rolled product. It was not effective.
- the length of either one of d1 and d2 is less than 10 mm, the molten steel discharged strongly collides with the solidified solidification layer and redissolves the solidified layer to cause an operation accident.
- the difference between d1 and d2 is 20mm or more, but the larger the difference is, it is advantageous to move the coagulation completion position, but d1 and d2 is preferably 10mm or more soaking nozzle 21 is disposed.
- the length ratio d1: d2 of d1 and d2 is 1: 3.
- FIG. 5 shows that when the length ratio (d1: d2) of d1 and d2 is cast as 1: 3, red color (around the solidification line) indicates that the region has a relatively high temperature, and the position is cast. It can be seen that the thickness of (2) is biased upward rather than the center. That is, by moving the position of the immersion nozzle 21, the flow and the temperature field is changed, through which it can be seen that the position where the solidification is completed can be biased to one side rather than the center of thickness.
- the segregation 4 and the solidification shrinkage hole 3 are eccentrically formed by a predetermined interval in the upper surface direction instead of the central portion in the thickness direction of the slab 2.
- the position of the immersion nozzle 21 is eccentric to inject the molten steel 1 to change the flow and temperature field of the molten steel 1 so that the solidification point is eccentric to the upper surface of the cast steel 2.
- the bending of the slab (2) occurs due to the residual stress due to the cooling difference generated during the solidification between the upper and lower surfaces of the slab (2), so that the difficulty in transferring the slab (2) to the feed roller (60) This may cause problems.
- the amount of cooling water sprayed on the upper part of the slab 2 is lowered until the time when the slab 2 drawn out in the secondary cooling step is completely solidified.
- the amount of cooling water to be sprayed on the lower part of the slab 2 is equal to or greater than the amount of cooling water to be sprayed on the upper part of the slab 2 after the cast slab 2 is completely solidified. I can keep it.
- the internal defect of the thick plate product is confirmed by the ultrasonic scanning.
- ultrasonic flaw detection most thick plates are detected at the center of thickness due to solidification shrinkage holes (3) and segregation (4) generated at the center of thickness during continuous casting. Even if the same solidification shrinkage hole 3 and segregation 4 occur inside the slab 2, as the product becomes more highly strengthened and extremely thickened, defects are easily detected during the ultrasonic flaw detection due to the following reasons.
- the rolling amount of the cast steel 2 decreases, so that the compression of the solidification shrinkage hole 3 becomes difficult.
- the central portion of the thickness of the slab 2 is less deformed than the surface, so that the compression of the solidification shrinkage hole 3 becomes more difficult.
- the solidification shrinkage hole 3b present at a position of 1 / 4t thickness is better compressed than the solidification shrinkage hole 3a at the center of thickness.
- the coagulation shrinkage hole 3 is eccentric in the upper surface direction rather than the center of thickness of the slab 2, the pores are more easily compressed to reduce defects due to ultrasonic flaw detection.
- the product produced after rolling the cast (2) is cooled from the surface. That is, the surface of the product is in a low temperature state, the inside is a relatively high temperature state, which causes tensile stress in the center of the thickness of the product.
- the segregation (4) is present in the center of the thickness of the slab (2), cracks are easily generated and propagated due to stress concentration, which causes defects in ultrasonic flaw detection.
- the higher the strength and the thicker the thick plate product the higher the tensile stress and the higher the incidence of defects.
- the segregation (4) does not exist at the position where the maximum tensile stress occurs in the cooling process, thereby preventing the propagation of cracks, thereby reducing the defects of the final product.
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Abstract
Description
Claims (7)
- 주편을 연속으로 주조하는 방법으로서,용강을 몰드 내부 중 중심부에서 주편의 두께방향으로 편심된 영역으로 주입하면서 몰드에 의해 1차 냉각시키는 단계와;몰드에 의해 1차 냉각되는 주편을 인발하면서 그 표면에 냉각수를 살수하여 2차 냉각시키는 단계를 포함하는 주편의 연속 주조 방법.
- 청구항 1에 있어서,상기 1차 냉각시키는 단계에서는 서로 대향 배치되는 한 쌍의 장변과 한 쌍의 단변으로 이루어지는 몰드의 내부로 침지노즐이 인입되어 용강이 주입되되, 상기 침지노즐은 한 쌍의 장변 중 선택되는 어느 하나의 장변 방향으로 편심되는 것을 특징으로 하는 주편의 연속 주조 방법.
- 청구항 2에 있어서,상기 2차 냉각시키는 단계에서 상기 주편은 몰드에서 하방으로 인발되어 전방으로 절곡되면서 인발되고,상기 1차 냉각시키는 단계에서는 상기 침지노즐이 편심되는 방향은 한 쌍의 장변 중 상기 주편이 인발되는 방향을 기준으로 전방에 배치되는 장변 방향인 것을 특징으로 하는 주편의 연속 주조 방법.
- 청구항 2에 있어서,상기 1차 냉각시키는 단계에서 상기 침지노즐과 한 쌍의 장변 중 선택되는 장변 사이의 거리(d1)와 상기 침지노즐과 한 쌍의 장변 중 다른 장변 사이의 거리(d2)와의 차이는 20mm 이상인 것을 특징으로 하는 주편의 연속 주조 방법.
- 청구항 2에 있어서,상기 1차 냉각시키는 단계에서 상기 침지노즐과 한 쌍의 장변 중 선택되는 장변 사이의 거리(d1)와 상기 침지노즐과 한 쌍의 장변 중 다른 장변 사이의 거리(d2)는 각각 10mm 이상인 것을 특징으로 하는 주편의 연속 주조 방법.
- 청구항 2에 있어서,상기 1차 냉각시키는 단계에서 상기 침지노즐과 한 쌍의 장변 중 선택되는 장변 사이의 거리(d1)와 상기 침지노즐과 한 쌍의 장변 중 다른 장변 사이의 거리(d2)와의 길이비(d1:d2)는 1 : 3 인 것을 특징으로 하는 주편의 연속 주조 방법.
- 청구항 2에 있어서,상기 2차 냉각시키는 단계에서 상기 주편은 몰드에서 하방으로 인발되어 전방으로 절곡되면서 인발되고,인발되는 주편이 완전히 응고되기 이전 시점까지는 주편의 상부에 살수되는 냉각수량이 주편의 하부에 살수되는 냉각수량보다 많게 유지하며,인발되는 주편이 완전히 응고된 이후 시점부터는 주편의 상부에 살수되는 냉각수량보다 주편의 하부에 살수되는 냉각수량이 많거나 같게 유지하는 것을 특징으로 하는 주편의 연속 주조 방법.
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BR112017016554A BR112017016554A2 (pt) | 2015-09-24 | 2016-06-03 | método de fundição contínua de placa |
CN201680008280.8A CN107206476B (zh) | 2015-09-24 | 2016-06-03 | 连续的板坯铸造方法 |
JP2017536931A JP6461357B2 (ja) | 2015-09-24 | 2016-06-03 | 鋳片の連続鋳造方法 |
EP16848756.9A EP3354371B1 (en) | 2015-09-24 | 2016-06-03 | Continuous slab casting method |
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KR1020150135925A KR101941877B1 (ko) | 2015-09-24 | 2015-09-24 | 주편의 연속 주조 방법 |
KR10-2015-0135925 | 2015-09-24 |
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WO2017052030A1 true WO2017052030A1 (ko) | 2017-03-30 |
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JP (1) | JP6461357B2 (ko) |
KR (1) | KR101941877B1 (ko) |
CN (1) | CN107206476B (ko) |
BR (1) | BR112017016554A2 (ko) |
WO (1) | WO2017052030A1 (ko) |
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KR101974566B1 (ko) * | 2017-10-12 | 2019-09-05 | 주식회사 포스코 | 주편 주조 방법 및 주조 설비 |
CN109093083B (zh) * | 2018-09-28 | 2020-09-01 | 邢台钢铁有限责任公司 | 一种表面质量优化的连铸钢坯及其制造方法 |
CN115846608B (zh) * | 2023-03-02 | 2023-04-28 | 北京科技大学 | 基于水口偏移程度分析的连铸工艺在线控制方法及系统 |
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KR101036320B1 (ko) | 2011-02-08 | 2011-05-23 | 주식회사 포스코 | 연속주조주편의 제조방법 |
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JP6019989B2 (ja) * | 2012-09-20 | 2016-11-02 | Jfeスチール株式会社 | 連続鋳造鋳片の2次冷却方法 |
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- 2015-09-24 KR KR1020150135925A patent/KR101941877B1/ko active IP Right Grant
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2016
- 2016-06-03 BR BR112017016554A patent/BR112017016554A2/pt not_active Application Discontinuation
- 2016-06-03 EP EP16848756.9A patent/EP3354371B1/en active Active
- 2016-06-03 JP JP2017536931A patent/JP6461357B2/ja active Active
- 2016-06-03 WO PCT/KR2016/005922 patent/WO2017052030A1/ko active Application Filing
- 2016-06-03 CN CN201680008280.8A patent/CN107206476B/zh active Active
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KR20110046671A (ko) * | 2009-10-29 | 2011-05-06 | 현대제철 주식회사 | 연속 주조 설비용 몰드 파우더의 투입장치 |
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KR101394441B1 (ko) * | 2012-12-27 | 2014-05-13 | 주식회사 포스코 | 연속주조장치 |
KR20140118571A (ko) * | 2013-03-29 | 2014-10-08 | 주식회사 포스코 | 몰드파우더를 이용한 연속주조방법 |
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JP2018501962A (ja) | 2018-01-25 |
JP6461357B2 (ja) | 2019-01-30 |
KR20170036973A (ko) | 2017-04-04 |
BR112017016554A2 (pt) | 2018-04-10 |
KR101941877B1 (ko) | 2019-01-25 |
CN107206476B (zh) | 2019-08-13 |
EP3354371A1 (en) | 2018-08-01 |
CN107206476A (zh) | 2017-09-26 |
EP3354371B1 (en) | 2019-10-02 |
EP3354371A4 (en) | 2018-08-08 |
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