EP3878572A1 - Moule de coulée d'acier continue et procédé de coulée d'acier continue - Google Patents

Moule de coulée d'acier continue et procédé de coulée d'acier continue Download PDF

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Publication number
EP3878572A1
EP3878572A1 EP19882667.9A EP19882667A EP3878572A1 EP 3878572 A1 EP3878572 A1 EP 3878572A1 EP 19882667 A EP19882667 A EP 19882667A EP 3878572 A1 EP3878572 A1 EP 3878572A1
Authority
EP
European Patent Office
Prior art keywords
mold
dissimilar material
cooling water
filled
steel casting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19882667.9A
Other languages
German (de)
English (en)
Other versions
EP3878572A4 (fr
Inventor
Norichika Aramaki
Yoichi Ito
Tomoya Odagaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Publication of EP3878572A1 publication Critical patent/EP3878572A1/fr
Publication of EP3878572A4 publication Critical patent/EP3878572A4/fr
Pending legal-status Critical Current

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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
    • B22D11/08—Accessories for starting the casting procedure
    • 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
    • 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
    • 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
    • B22D11/0401—Moulds provided with a feed head
    • 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
    • B22D11/059—Mould materials or platings

Definitions

  • the present invention relates to a mold for continuous casting that can prevent surface cracking in a strand caused by uneven cooling of a solidifying shell and can be used more times than conventional molds.
  • the invention also relates to a continuous steel casting method using the mold for continuous casting.
  • the thickness of the solidifying shell may be nonuniform in the strand withdrawal direction and the width direction of the mold.
  • Stress due to shrinkage or deformation of the solidifying shell itself acts on the solidifying shell. This stress concentrates on a thin-walled portion of the solidifying shell, and the stress concentration causes cracks to occur on the surface of the solidifying shell in the early stage of solidification. These surface cracks grow due to subsequent thermal stress and external forces such as bending stress and levelling stress in the continuous casting machine, and larger surface cracks are thereby formed.
  • the cracks on the surface of the strand become surface defects of a steel product in the subsequent hot-rolling step. Therefore, to prevent the occurrence of the defects on the surface of the steel product, it is necessary to hot-scarf or grind the surface of the slab to remove the surface cracks in the slab.
  • Patent Literature 1 proposes a mold for continuous casting that has a plurality of dissimilar material-filled portions formed independently on inner wall surfaces of the mold and having a thermal conductivity different from that of a copper alloy forming mold plates (referred to also as "copper mold plates"). It is stated in Patent Literature 1 that the use of the mold can effectively prevent surface cracking in the strand due to uneven cooling of the solidifying shell in the early stage of solidification. In particular, it is stated that surface cracking in the strand due to unevenness in the thickness of the solidifying shell caused by transformation from ⁇ iron to y iron in medium carbon steel undergoing the peritectic reaction can be effectively prevented.
  • Patent Literature 1 In the mold for continuous steel casting described in Patent Literature 1, the dissimilar material-filled portions formed of a material different from the material of the mold plates are formed in the mold plates. Therefore, the thermal expansion coefficient of the mold plates differs from the thermal expansion coefficient of the dissimilar material-filled portions, and thermal stress is likely to concentrate on boundary portions therebetween, so that cracks are likely to occur on the surface of the mold. It is stated in Patent Literature 1 that it is preferable to provide a plating layer covering the dissimilar material-filled portions on the inner wall surfaces of the mold for the purpose of preventing cracks on the surface of the mold caused by thermal history and that this can extend the service life of the mold.
  • the present invention has been made in view of the above circumstances, and it is an object to provide a mold for continuous casting that has dissimilar material-filled portions formed therein and can be used significantly more times than conventional molds. It is another object to provide a continuous steel casting method that uses the mold for continuous casting.
  • the water stream disturbing portion that disturbs the water stream and increases the surface area of the cooling water channel is formed in a portion of the cooling water channel that corresponds to the region in which the dissimilar material-filled portion is formed. Therefore, in this portion of the cooling water channel, the heat transfer coefficient between the water stream and the cooling water channel is large, and the amount of convective heat transfer is increased, so that heat in the mold plate in the region in which the dissimilar material-filled portion is formed can be effectively removed.
  • the thermal stress generated in the boundary portion between the mold plate and the dissimilar material-filled portion can be effectively reduced.
  • the occurrence of surface cracking in a strand of the steel type undergoing the peritectic reaction is prevented, and the number of times the mold having the dissimilar material-filled portion formed therein can be used can be increased, i.e., the service life of the mold can be extended.
  • a strand including the solidifying shell as its outer shell and the unsolidified molten steel 4 inside the solidifying shell is continuously withdrawn from the mold 1 in a strand withdrawal direction A, i.e., a vertically downward direction, to thereby produce a steel slab.
  • the mold plates are in contact with the molten steel 4 and the high-temperature strand. Therefore, the surface temperature of the mold plates (the temperature on the side in contact with the molten steel) increases and is highest near the position of a meniscus M (the top surface of the molten steel in the mold) in the mold.
  • the position of the meniscus M is indicated by a dash-dot line.
  • a plurality of circular recesses are formed on the front surface of the mold plate 21, and the circular recesses are filled with the dissimilar material to form a plurality of independent dissimilar material-charged portions 22.
  • the dissimilar material-charged portions 22 are arranged regularly such that the heat flux from the mold inner wall surface to the cooling water channels varies periodically on the mold inner wall surface.
  • the thermal resistance of the mold plate 21 in the strand withdrawal direction A in the region including the vicinity of the meniscus M and the mold width direction B increases and decreases regularly and periodically.
  • the heat flux in the vicinity of the meniscus M i.e., the heat flux from the solidifying shell to the mold plate 21 in the early stage of solidification, increases and decreases regularly and periodically.
  • the regular and periodic increase and decrease of the heat flux reduces stress generated by transformation from ⁇ iron to y iron and thermal stress, so that the deformation of the solidifying shell caused by these stresses decreases.
  • the shape of the recesses on the front surface of the mold plate 21 may not be perfect circular (referred to as “circular recesses”) and may be quasi-circular (referred to as “quasi-circular recesses”).
  • the quasi-circular shape is a shape with no sharp corners such as an elliptical shape or a square or rectangular shape with circular or elliptical corners. Moreover, a petal-like shape may be used.
  • the thermal conductivity of the dissimilar material is preferably 80% or less or 125% or more of the thermal conductivity of the mold plates formed in the mold long sides 2 and the mold short sides 3.
  • the thermal conductivity of the dissimilar material varies depending on a change in the temperature of the environment. Therefore, the thermal conductivity of the dissimilar material and the thermal conductivity of the mold plate are based on those at room temperature (normal temperature) during production of the mold.
  • the regular and periodic increase and decrease of the heat flux on the mold inner wall surface can reduce stress generated by transformation from ⁇ iron to y iron and thermal stress. It is only necessary that the stress generated by the transformation described above etc. can be reduced to prevent surface cracking in the strand. Therefore, it is not always necessary that the thermal conductivity of the dissimilar material be in the above range, and it is not always necessary that the distances between the dissimilar material-filled portions 22 be the same.
  • Examples of the dissimilar material whose thermal conductivity is 80% or less of the thermal conductivity of the mold plates include Ni (thermal conductivity: about 90 W/(m ⁇ K)) and Ni alloys (thermal conductivity: about 40 to 90 W/(m ⁇ K)) that are easily plated and thermally sprayed.
  • a copper alloy (thermal conductivity: about 100 to 385 W/(m ⁇ K)) may be used for the mold plates, and, for example, a high-thermal conductivity copper alloy (thermal conductivity: about 318 W/(m ⁇ K)) or a low-thermal conductivity copper alloy (thermal conductivity: about 119 to 239 W/(m ⁇ K)) for electromagnetic stirring may be used.
  • metals other than the Ni alloys and the copper alloys can be used for the dissimilar material and the mold plates.
  • Dissimilar material-filled portions may be formed on the front surface of each of the unillustrated mold short sides 3 whose description is omitted, as in the mold long sides 2.
  • stress is likely to concentrate on the long sides of the solidifying shell because of its shape, and surface cracking is likely to occur on the long sides. Therefore, although it is necessary that the dissimilar material-filled portions be provided on the mold long sides of the continuous casting mold for a slab strand, it is not always necessary that the dissimilar material-filled portions be provided on the mold short sides.
  • the dissimilar material-filled portions 22 are provided on the mold inner wall surface in a region extending from a position spaced a distance Q upward from the position of the meniscus M during steady casting to a position spaced a distance R downward from the meniscus.
  • the distance Q is any value larger than zero.
  • Vc is the strand withdrawal speed (m/min) in the continuous steel casting process.
  • the effect of the periodic change in the heat flux from the mold inner wall surface to the cooling water channels by the dissimilar material-filled portions 22 can be sufficiently obtained.
  • the effect of preventing surface cracking in the strand can be obtained even during highspeed casting or casting of medium carbon steel during which surface cracking is likely to occur.
  • the distance Q is any value larger than zero.
  • the dissimilar material-filled portions 22 are formed up to a position about 10 mm above the meniscus M such that the upper end of the region of the dissimilar material-filled portions 22 is always located above the meniscus M.
  • the upper end of this region is located up to about 20 mm above the meniscus M.
  • the position of the meniscus M is generally 60 to 150 mm below the upper ends of the mold long sides 2, and the region in which the dissimilar material-filled portions 22 are formed is determined accordingly.
  • water stream disturbing portions that disturb a water stream and increase the surface area of the cooling water channels are formed in portions of the cooling water channels that cool the regions of the mold plates 21 in which the dissimilar material-filled portions 22 are formed to thereby increase the heat transfer coefficient between the cooling water channels and the water stream in the above regions. In this manner, heat removal from the mold plates in the regions in which the dissimilar material-filled portions 22 are formed is facilitated.
  • FIG. 3 shows the structure of a portion of the mold long side that is surrounded by a square ( ⁇ ) in Fig. 2 .
  • (a) is a plan view showing the front surface of the mold plate
  • (b) is a plan view showing the back surface of the mold plate.
  • (c) is a vertical cross-sectional view of the portion of the mold long side
  • (d) is a horizontal cross-sectional view of the portion of the mold long side.
  • a backup plate 23 is attached to the back side of the mold plate 21 so as to cover the cooling water channels 31 formed in the mold plate 21.
  • the cooling water channels 31 are formed on the back surface of the mold plate 21.
  • the cooling water channels 31 are formed from a plurality of vertically elongated grooves extending in the strand withdrawal direction A, and the plurality of grooves are arranged in the mold width direction B. Since the grooves have the vertically elongated shape, the linear flow rate in the cooling water channels 31 can be easily increased even when the amount of water supplied to the cooling water channels 31 is small. Moreover, the temperature of the water stream can be easily maintained low, and the mold plate 21 can be cooled efficiently.
  • a plurality of protrusions 32 are disposed in each of the cooling water channels 31 so as to be arranged in the direction of the flow of the water stream (the direction opposite to the strand withdrawal direction A).
  • the protrusions 32 can be disposed by fitting them into grooves (not shown) formed in the cooling water channels 31, joining them to the mold plate 21 by welding, or bonding them to the mold plate 21 using an adhesive.
  • the water stream flowing through the cooling water channels 31 collides with the protrusions 32 and is disturbed.
  • the degree of turbulence of the water stream in the regions in which the protrusions 32 are disposed increases, and the thickness of the boundary layer of the water stream (turbulence) in contact with the cooling water channels 31 decreases. Therefore, the heat transfer coefficient from the cooling water channels 31 to the water stream increases, so that the mold plate 21 in the region in which the dissimilar material-filled portions 22 are formed can be effectively cooled.
  • the protrusions 32 increase the surface area of the cooling water in contact with the mold plate 21, the mold plate 21 in the region in which the dissimilar material-filled portions 22 are formed can be cooled more effectively.
  • the protrusions 32 have a length in the mold width direction B equal to or more than 1/3 of the width of the cooling water channels 31 (the width in the mold width direction) and equal to or less than this width in the mold width direction.
  • the height (length) of the protrusions 32 in the thickness direction of the cooling water channels 31 is equal to or more than 1 mm from the back surface of the mold plate 21 (the bottoms of the cooling water channels 31) and equal to or less than 1/2 of the thickness w of the cooling water channels 31.
  • the protrusions 32 are formed on the back surface of the mold plate 21 at positions corresponding to the region in which the dissimilar material-filled portions 22 are formed.
  • the protrusions 32 may be provided in the cooling water channels 31 in portions extending from the upper end of the mold plate 21 to the lower end. In the example shown in Fig. 3 , the protrusions 32 are formed so as to cover the entire cooling water channels 31 in the mold width direction.
  • the degree of turbulence of the water stream flowing through the cooling water channels 31 or whether the water stream is a laminar flow can be determined using the well-known Reynolds number Re as an indicator.
  • the Reynolds number Re can be computed using the density (kg/m 3 ) of the water stream, the linear velocity (m/s) of the water stream, a characteristic length (m) such as the distance through which the water stream flows, and the viscosity coefficient (Pa ⁇ s) of the water stream.
  • the Reynolds number Re may be computed using the thickness w of the cooling water channels 31 with no protrusions 32 (see Fig.
  • the thickness of the cooling water channels 31 in the regions in which the protrusions 32 are formed is small due to the presence of the protrusions 32, and the water stream impinging on the protrusions 32 can be considered to form turbulence.
  • the dissimilar material-filled portions 22 are formed on the mold plates 21 so as to satisfy the condition of formula (4) below.
  • formula (4) t: the filling depth (mm) of the dissimilar material in each dissimilar material-filled portion, and d: the width (mm) of each dissimilar material-filled portion in the mold width direction.
  • the width d of the dissimilar material-filled portions 22 is preferably 2 to 20 mm.
  • an equivalent circle diameter determined from formula (6) below may be used as the width d.
  • Equivalent circle diameter 4 ⁇ S / ⁇ 1 / 2
  • S is the area (mm 2 ) of each dissimilar material-filled portion 22.
  • the width d or the equivalent circle diameter is 2 mm or more, the circular or quasi-circular recesses can be easily filled with the dissimilar material using the plating means or the thermal spraying means.
  • the width d or the equivalent circle diameter is 20 mm or less, a reduction in heat flux in the dissimilar material-filled portions 22 is prevented, i.e., a delay in solidification in the dissimilar material-filled portions 22 is prevented. Therefore, concentration of stress on the solidifying shell at these portions is prevented, and the occurrence of surface cracking in the solidifying shell can be easily prevented.
  • the filling thickness t of the dissimilar material is from 0.5 mm to d mm inclusive in order to satisfy formula (4). If the filling thickness t of the dissimilar material-filled portions 22 (see Fig. 3(d) ) is less than 0.5 mm, the amount of variation in heat flux in the dissimilar material-filled portions 22 may be insufficient. If the filling thickness t is excessively large, it is difficult to fill the recesses with the dissimilar material. Therefore, the filling thickness t is preferably equal to or less than the width d (mm) of the dissimilar material-filled portions in the mold width direction. Preferably, the filling thickness t is at most 10 mm. This is because, if the filling thickness t exceeds 10 mm, it is difficult to fill the recesses with the dissimilar material.
  • a plating layer 51 may be formed on the front surface of each mold plate 21 so as to cover the dissimilar material-filled portions 22. In this manner, wear by the solidifying shell and surface cracking in the mold due to thermal history can be prevented.
  • the plating layer 51 can be formed by plating treatment or thermal spraying treatment using commonly used nickel or an alloy containing nickel such as a nickel-cobalt alloy (Ni-Co alloy) or a nickel-chromium alloy (Ni-Cr alloy).
  • Continuous steel casting for casting a slab may be performed using the mold for continuous casting described above.
  • the cooling water is supplied to the mold for continuous casting such that the water stream forms turbulence in the positions in the cooling water channels in which the water stream disturbing portions are formed.
  • the molten steel is medium carbon steel, surface cracking in the strand can be effectively prevented, and the continuous casting operation can be performed for a long time using the same mold.
  • the mold powder used had a basicity ((% by mass CaO)/(% by mass SiO 2 )) of 1.1, a melting temperature of 1210°C, and a viscosity at 1300°C or 0.15 Pa ⁇ s.
  • thermocouples were embedded in a plurality of dissimilar material-filled portions 22 in the vicinity of the meniscus M and midpoints between adjacent dissimilar material-filled portions 22, and the temperatures at these points were measured by the thermocouples. The temperatures were measured at one second intervals, and the temperature data was recorded. The distance between the molten steel-side surface of each mold plate 21 and the points at which the temperatures were measured using the thermocouples was 15 mm. The surface temperatures of the mold plates 21 were computed based on a heat transfer model using the measured temperature data.
  • the protrusions 32 were disposed on the mold plate 21 side of the cooling water channels 31 as shown in Fig. 3 . However, in Inventive Example 19, the protrusions 32 were disposed on the backup plate 23 side of the cooling water channels 31.
  • the average surface temperature of the mold plate 21 was computed based on a heat transfer model using the temperature data measured at the plurality of dissimilar material-filled portions 22 and the plurality of midpoints. Then the average temperatures in the 5 charges of continuous casting were averaged by the number of data samples obtained during a steady operation period, and the computed value was placed in Table 1 as "meniscus position temperature.” Moreover, the maximum value of the absolute values of the differences between the "meniscus position temperature" and the surface temperatures of the mold plate 21 computed similarly from the temperature data measured at the plurality of dissimilar material-filled portions 22 and the plurality of midpoints during the steady operation period in the 5 charges of continuous casting was placed in Table 1 as "maximum temperature variation.”
  • Inventive Example 19 the continuous steel casting was performed under the same conditions as those in Inventive Example 5 except that the protrusions 32 were disposed on the backup plate 23 side.
  • the rates of occurrence of surface cracking in the slabs were zero.
  • the meniscus position temperature was slightly higher than that in Inventive Example 5. This may be because, since the protrusions 32 are disposed on the backup plate 23 side, the surface area of each mold plate 21 facing the cooling water channels 31 is smaller than that in Inventive Example 5.
  • the maximum temperature variation was smaller than that in Inventive Example 3.
  • the meniscus position temperature was higher than that in Inventive Example 3.
  • the high meniscus position temperature means that the temperature at any position in the mold width direction is high, and this may be the reason that the maximum temperature variation (the difference between the average temperature and the highest temperature or the lowest temperature) is small.
  • formula (3) is not satisfied. Therefore, the meniscus position temperature was higher than 300°C, and the maximum temperature variation was higher than 40°C.
  • the present invention can prevent the occurrence of surface cracking in a medium carbon steel slab and effectively reduce the temperature of the mold plates in the vicinity of the meniscus in which the dissimilar material-filled portions are formed. With the present invention, the service life of the mold having the dissimilar material-filled portions formed therein can be extended.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP19882667.9A 2018-11-09 2019-11-06 Moule de coulée d'acier continue et procédé de coulée d'acier continue Pending EP3878572A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018211623 2018-11-09
PCT/JP2019/043434 WO2020095932A1 (fr) 2018-11-09 2019-11-06 Moule de coulée d'acier continue et procédé de coulée d'acier continue

Publications (2)

Publication Number Publication Date
EP3878572A1 true EP3878572A1 (fr) 2021-09-15
EP3878572A4 EP3878572A4 (fr) 2021-09-15

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EP19882667.9A Pending EP3878572A4 (fr) 2018-11-09 2019-11-06 Moule de coulée d'acier continue et procédé de coulée d'acier continue

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EP (1) EP3878572A4 (fr)
JP (1) JP7004085B2 (fr)
KR (1) KR102521186B1 (fr)
CN (1) CN113015587B (fr)
WO (1) WO2020095932A1 (fr)

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CN112059150B (zh) * 2020-09-25 2024-07-05 杭州凯普科技有限公司 一种阳极板浇铸系统

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IT1267246B1 (it) * 1994-06-06 1997-01-28 Danieli Off Mecc Sottolingottiera a pareti per colata continua
JPH10128513A (ja) * 1996-10-30 1998-05-19 Sumitomo Metal Ind Ltd 連続鋳造用分割鋳型
JP3865615B2 (ja) * 2001-10-30 2007-01-10 三島光産株式会社 高熱流束に対応する連続鋳造鋳型
DE102005026329A1 (de) 2005-06-07 2006-12-14 Km Europa Metal Ag Flüssigkeitsgekühlte Kokille zum Stranggießen von Metallen
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JP4611349B2 (ja) 2007-06-27 2011-01-12 三島光産株式会社 連続鋳造用鋳型
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JP2018149602A (ja) * 2018-05-24 2018-09-27 Ｊｆｅスチール株式会社 鋼の連続鋳造方法

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Publication number Publication date
KR20210069092A (ko) 2021-06-10
EP3878572A4 (fr) 2021-09-15
JPWO2020095932A1 (ja) 2021-09-02
CN113015587B (zh) 2022-12-27
KR102521186B1 (ko) 2023-04-13
JP7004085B2 (ja) 2022-01-21
WO2020095932A1 (fr) 2020-05-14
CN113015587A (zh) 2021-06-22

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