WO2010073813A1 - 鋼の連続鋳造方法 - Google Patents
鋼の連続鋳造方法 Download PDFInfo
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- WO2010073813A1 WO2010073813A1 PCT/JP2009/068462 JP2009068462W WO2010073813A1 WO 2010073813 A1 WO2010073813 A1 WO 2010073813A1 JP 2009068462 W JP2009068462 W JP 2009068462W WO 2010073813 A1 WO2010073813 A1 WO 2010073813A1
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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
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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
- B22D11/114—Treating the molten metal by using agitating or vibrating means
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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
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
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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
-
- 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
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
Definitions
- the present invention relates to a continuous casting method of steel in which a surface of a slab including an unsolidified portion is hit and cast while applying vibration to the slab.
- central segregation Internal defects, which are macro segregation called central segregation, V segregation, and reverse V segregation, are likely to occur in the central portion in the thickness direction of the slab cast from continuous casting and in the vicinity thereof.
- Center segregation is an internal defect in which solute components such as C, S, P, and Mn that are easily segregated (hereinafter also referred to as “segregation components”) appear in the final solidified portion of the slab.
- Segregation is an internal defect in which these segregation components are concentrated in a V shape or an inverted V shape in the vicinity of the final solidified portion of the slab.
- the generation mechanism of segregation in the slab is considered as follows. That is, as solidification progresses, segregation components concentrate between the columns of columnar crystals that are solidified structures.
- the molten steel enriched in the segregation component (hereinafter also referred to as “concentrated molten steel”) flows out between the columns of columnar crystals due to shrinkage of the slab during solidification or swelling of the slab called bulging.
- the concentrated molten steel that has flowed out flows toward the solidification completion point of the final solidified portion, and solidifies as it is to form a concentrated band of segregation components.
- the concentration band of the segregation component thus formed is segregation.
- the present inventors in the casting direction when the position of the casting direction including the unsolidified portion of the slab having a rectangular cross-sectional shape is reduced by a plurality of guide roll pairs for reduction.
- a continuous casting method of steel was proposed in which at least one spot on the surface of the slab is continuously hit to cast the slab while applying vibration.
- the columnar crystals in the middle of growth can be broken by the striking vibration of the slab, and the growth of the columnar crystals can be suppressed.
- the generated equiaxed crystal bridges a space is formed, and segregation occurs in the space, but this space is destroyed by the impact. Therefore, equiaxed crystals can be packed at high density, and the concentrated molten steel can be finely dispersed between crystal grains, and the segregation such as center segregation, V segregation, and reverse V segregation is reduced, and the internal quality is good.
- a slab can be obtained.
- the center porosity is a small hole generated near the center in the thickness direction, which is the final solidification position, due to solidification shrinkage when the molten steel solidifies in continuous casting or heat shrinkage due to cooling after solidification.
- it is required to reduce the center porosity as well as segregation. Further, it is required to investigate the detailed relationship between the vibration condition of the cast slab due to impact and the quality of the center part of the slab, to establish an appropriate vibration condition, and to improve the efficiency of continuous casting.
- the present invention has been made in view of the above-mentioned problems, and the problem is that the slab is struck and vibrated under appropriate conditions, so that a slab having good internal quality without segregation or central porosity is efficiently produced.
- An object of the present invention is to provide a continuous casting method of steel that can be obtained well.
- the present inventors examined a continuous casting method of steel for efficiently obtaining a slab having good internal quality without segregation or central porosity, and obtained the following findings (A) and (B).
- the present invention has been completed on the basis of the above findings, and the gist of the following (1) and (2) steel continuous casting methods.
- ⁇ (x) exp [ ⁇ 1.5 ⁇ ⁇ ln (x / (200 ⁇ ( ⁇ R / ⁇ R 0 ) 0.587 )) ⁇ 2 ] ⁇ ⁇ max (1)
- ⁇ max L 0 ⁇ (E / E 0 ) 0.5 ⁇ ( ⁇ R / ⁇ R 0 ) ⁇ (t / t 0 ) 0.446 (2)
- each symbol in the above formulas (1) and (2) means the following quantities.
- the displacement ⁇ (x) generated by striking on each of the left and right short side surfaces is made equal by making the phase of the time for periodically striking the opposing left and right short side surfaces of the slab to be equal to each other.
- the vibration of the long side surface of the slab caused by striking the short side surface of the slab can be applied over a wide range of the slab, the segregation or The central porosity can be reduced, and a slab excellent in internal quality can be obtained.
- FIG. 1 is a view showing the arrangement of a continuous casting machine and a striking vibration device to which the continuous casting method of the present invention can be applied.
- FIG. 1 (a) shows a side view of the continuous casting machine, and FIG. The top view of the part which installed the vibration apparatus is shown.
- FIG. 2 is a cross-sectional view of the slab showing the sampling position of the sample for calculating the central porosity ratio volume.
- FIG. 3 is a graph showing the relationship between the impact energy per side of one segment and the amount of decrease in the central porosity ratio volume.
- FIG. 4 is a schematic diagram of a vibration model by striking a slab having an unsolidified portion, where (a) shows a plan view and (b) shows a view as seen from the casting direction.
- FIG. 1 (a) shows a side view of the continuous casting machine, and FIG. The top view of the part which installed the vibration apparatus is shown.
- FIG. 2 is a cross-sectional view of the slab showing the sampling position of the sample for calculating
- FIG. 5 is a graph showing the relationship between the distance from the short side impact position and the displacement in the slab thickness direction.
- FIG. 6 is a graph showing the relationship between the maximum displacement ⁇ max in the slab thickness direction and the reduction amount ⁇ Vp of the center porosity ratio volume.
- FIG. 7 is a graph showing the relationship between the impact energy per side of one segment and the vibration reach distance.
- FIG. 8 is a graph showing the relationship between the impact energy per side of one segment and the vibration reach distance, and the influence of the inter-axial distance of the guide roll.
- FIG. 9 is a graph showing the influence of impact from the short side surfaces at both ends in the width direction of the slab.
- the inventors conducted a continuous casting test while applying vibration to the slab by striking and analyzed the effect of vibration, and as described below, the influence of vibration on the internal quality of the slab. investigated.
- FIG. 1 is a view showing the arrangement of a continuous casting machine and a striking vibration device to which the continuous casting method of the present invention can be applied, (a) shows a side view of the continuous casting machine, and (b) shows a continuous state. The top view of the part which installed the impact vibration apparatus of the casting machine is shown.
- the continuous casting machine shown in the figure is a vertical bending die and includes a slab striking vibration device.
- the molten steel 4 injected into the mold 3 from the tundish (not shown) through the immersion nozzle 1 is cooled by spray water sprayed from the mold 3 and a group of secondary cooling spray nozzles (not shown) below it, A solidified shell 5 is formed to become a slab 7.
- the slab 7 is pulled out while being supported by the group of guide rolls 6 while holding the unsolidified portion therein.
- a meniscus which is the molten metal surface 2 of the molten steel 4 is shown.
- the guide roll 6 is divided into a plurality of segments (not shown).
- the striking vibration device 8 has a driving portion 10 and a striking die 9 attached to the tip portion thereof.
- the casting speed was 0.58 to 0.61 m / min, and the amount of secondary cooling water was 0.62 to 0.73 L / kg-steel.
- ⁇ T is the difference between the actual molten steel temperature and the liquidus temperature of the molten steel.
- the two pairs of striking vibration devices 8 were arranged at a position of 22.5 m and a position of 24.0 m on the downstream side in the casting direction from the meniscus 2 in the mold 3 with reference to the center of the mold 9 in the casting direction.
- the mold 9 of the striking vibration device 8 had a striking surface having a casting direction length of 1155 mm, a vertical direction height of 135 mm, and a mass of 500 kg.
- An air cylinder device was used for the drive unit 10 of the impact vibration device 8.
- the frequency of impact vibration on the short side surface of the slab 7 was 4 to 6 Hz, that is, the number of impacts per second was 4 to 6 times.
- the columnar crystals in the middle of growth can be broken and the growth of columnar crystals can be suppressed. Further, when the generated equiaxed crystal bridges, a space is formed, and segregation occurs in the space, but this space is destroyed by hitting. Therefore, equiaxed crystals can be filled with a high density, the concentrated molten steel can be finely dispersed between crystal grains, and segregation and central porosity can be reduced.
- the center solid phase ratio of the slab 7 is calculated by one-dimensional heat transfer calculation mainly using the casting speed and the amount of secondary cooling water as variables, and based on the result, a predetermined central solid ratio is obtained at the striking position.
- the conditions were sought. And the continuous casting on the said conditions was performed, hitting the short side surface of a slab.
- the occurrence of central porosity was evaluated by the following method.
- the sample for calculating the specific volume of the center porosity collected from the slab is 50 mm in length (in the thickness direction of the slab), 100 mm in width (in the width direction of the slab), and the thickness (in casting) in consideration of the specific gravity measurement accuracy.
- the casting direction of the piece was a 7 mm rectangular parallelepiped, and the surface processing accuracy was a finish according to JIS (triangle symbol ⁇ : maximum surface roughness 3.2 ⁇ m).
- the center of the thickness based on the density at the position of 1/4 of the thickness in the thickness direction from the surface of the slab where the occurrence of the center porosity is considered to be little (hereinafter also referred to as “1/4 thickness position”)
- the occurrence of central porosity was evaluated based on the specific volume of central porosity calculated from the density of.
- the center porosity specific volume Vp was defined by the following formula (1) by the average density ⁇ 0 at the 1 ⁇ 4 thickness position and the average density ⁇ at the center in the thickness direction. Vp ⁇ 1 / ⁇ 1 / ⁇ 0 (1)
- FIG. 2 is a cross-sectional view of a slab showing a sampling position of a sample for calculating the center porosity ratio volume.
- the average density ⁇ 0 at the 1 ⁇ 4 thickness position of the slab was calculated by taking a total of two samples 7a, one each from both ends in the width direction of the slab, and averaging the respective densities.
- the average density ⁇ at the center in the thickness direction was calculated by taking a total of six samples 7b, 7c, and 7d from three ends in the width direction of the slab and averaging the respective densities.
- the positions at which the samples 7a to 7d were collected are based on the center of the sample, the samples 7a and 7b are 190 mm from the slab short side surface, the sample 7c is 320 mm from the slab short side surface, and the sample 7d is from the slab short side surface. 425 mm.
- the central porosity ratio volume reduction amount ⁇ Vp was defined by the following equation (2). . - ⁇ Vp ⁇ Vp 0 -Vp 1 (2)
- FIG. 3 is a graph showing the relationship between the impact energy per one side of a segment and the amount of decrease in the central porosity specific volume.
- the reduction amount - ⁇ Vp of the center porosity ratio volume is calculated and arranged for each slab hit with different impact energies. From the relationship shown in the graph, it was confirmed that when the impact energy E per side of one segment exceeds 25 J, the center porosity ratio volume decreases at the end in the slab width direction.
- the regression equation (3) is obtained.
- - ⁇ Vp [cm 3 / g] 0.0049347 ⁇ E [J]-1.297487 (3)
- FIG. 4 is a schematic diagram of a vibration model by striking a slab having an unsolidified portion, where (a) shows a plan view and (b) shows a view seen from the casting direction.
- the solidified shell 5 of the slab 7 is in a state of being restrained by a guide roll 6. In this state, the short side surface of the slab 7 is hit by the hit vibration device 8.
- the shape of the die 9 of the impact vibration device 8 was a rectangular parallelepiped having a length a in the casting direction of 1200 to 1600 mm, a thickness b of 140 mm, and a width c in the slab thickness direction of 200 mm.
- the slab 7 had a width of 2300 mm and a thickness of 300 mm. Using such a three-dimensional model, numerical analysis was performed on the displacement of the surface (long side surface) due to vibration of the slab 7.
- the influence on the displacement fluctuation range by the axial distance ⁇ R of the guide roll at the position where the short side surface is struck and the unsolidified thickness t of the slab at the position where the short side surface is struck can be arranged independently. It has been found that the displacement fluctuation width in the long side plate thickness direction at a position of 200 mm in the direction perpendicular to the short side surface from the strike position on the short side surface changes substantially in direct proportion to ⁇ R. Based on these findings, the following formula (b) was obtained by extending the formula (a) as an estimation formula for the displacement fluctuation width L.
- E 0 , ⁇ R 0 and t 0 are the numerical values of the conditions where the central porosity reduction effect of E, ⁇ R and t was the greatest, and L 0 is the maximum in the slab thickness direction when the central porosity reduction effect was the largest. These are representative conditions for displacement, and are the following constant group (5). Hereinafter, this condition is also referred to as condition (5).
- FIG. 5 is a graph showing the relationship between the distance from the short side impact position and the displacement in the slab thickness direction.
- the horizontal axis of the graph is the distance x in the direction perpendicular to the short side surface from the striking position of the short side surface of the slab, and the vertical axis is the dimensionless displacement ( ⁇ (x) in the slab thickness direction of the slab surface. (Dimensionless value with the maximum displacement taken as 1 divided by ⁇ max ).
- ⁇ indicates a value calculated by numerical analysis
- ⁇ indicates a value approximated by a lognormal distribution. From the results shown in the graph, it can be seen that the values calculated by numerical analysis are approximated with a lognormal distribution with high accuracy.
- FIG. 6 is a graph showing a relationship between the maximum displacement ⁇ max in the slab thickness direction and the decrease amount ⁇ Vp of the center porosity ratio volume.
- the unsolidified thickness t of the slab at the striking position on the short side of the slab the unsolidified thickness at the entrance of the segment where the striking vibration device 8 is arranged by heat transfer solidification calculation at a casting speed of 0.7 m / min. The thickness was calculated and used.
- the present inventors have found from the results shown in FIG. 6 that in the case of a slab having a thickness of 300 mm and a width of 2300 mm, the center porosity ratio volume decreases if ⁇ max is 0.10 mm or more.
- the present inventors have further studied the relationship between the slab internal quality and the displacement of the slab due to impact, and the distance x from the short side surface at a position where ⁇ max is 0.10 mm or more and ⁇ max is If the distance x at a position where the distance x is 200 mm or more or ⁇ max is less than 200 mm and the displacement ⁇ (x) at a position where the distance x is 200 mm is 0.10 mm or more, segregation and center over a wide range inside the slab It has been found that the porosity can be reduced and the internal quality of the slab can be improved. In addition, this continuous casting test was carried out with two pairs of impact vibration devices installed, but even if the impact vibration devices are one pair or three pairs or more, the effect of improving the internal quality of the slab is the same as in the case of two pairs. It was confirmed that
- FIG. 7 is a graph showing the relationship between the impact energy per side of one segment and the vibration reach distance.
- the maximum value x * of the distance x in the direction perpendicular to the short side surface from the striking position of the short side surface of the slab in the region where the displacement ⁇ in the slab thickness direction by impact is 0.10 mm or more is defined as the vibration reach distance.
- the curve in FIG. 7 was calculated from the above equation (7) and the conditions indicated by ⁇ .
- the vibration reach distance x * can be increased by increasing the impact energy E.
- the vibration reach distance x * is increased by 25% from 200 mm to 250 mm. That is, by increasing the impact energy E, it is possible to improve the quality of the central portion in the slab thickness direction in the vicinity of the end portion in the slab width direction where central porosity is likely to occur due to solidification delay.
- FIG. 8 is a graph showing the relationship between the striking energy per one segment side and the vibration reaching distance when the distance between the shafts of the guide roll is changed. It is. FIG. 8 is a graph for a case where the guide roll is hit under the same conditions as in FIG. 7 except that the inter-axis distance ⁇ R is 245 mm or 400 mm. From the relationship shown in the graph, it can be seen that the vibration reach distance x * increases when the inter-axis distance ⁇ R of the guide roll is increased from 245 mm to 400 mm. That is, when the slab is a slab having a large ratio of the long side length to the short side length, the slab width is wide and bulging between the guide rolls is likely to occur. I can't take it big. On the other hand, when the slab is a bloom with a small ratio of the long side length to the short side length, the slab width is narrow and the bulging between the guide rolls is small. Therefore, it is advantageous in that the impact effect can be obtained in a wide range.
- FIG. 9 is a graph showing the influence of impact from the short side surfaces at both ends in the width direction of the slab.
- the horizontal axis is the distance y in the direction perpendicular to the short side surface from the center in the width direction of the slab
- the vertical axis is the displacement ⁇ in the slab thickness direction.
- the slab hit is a bloom having a width of about 400 mm
- the guide roll axial distance ⁇ R is 400 mm
- the impact energy E per segment piece side is 45 J
- only the short side on the left side of the slab in the casting direction or the right short side The calculation result about the case where only a side surface is struck and the case where a short side surface on both sides is struck simultaneously is shown.
- the displacement of the slab thickness direction in the region where the displacement ⁇ is 0.10 mm or more is about 300 mm, and the displacement ⁇ cannot be 0.10 mm or more over the entire width.
- the displacement ⁇ can be made 0.10 mm or more over the entire width of the hitting position.
- the maximum value of the displacement ⁇ reaches 0.40 mm at the center in the width direction of the slab, and the displacement ⁇ can be greatly increased. It is possible to further improve the internal quality of the slab.
- the method of the present invention since the vibration of the long side surface of the slab caused by striking the short side surface of the slab can be applied over a wide range of the slab, the segregation or The central porosity can be reduced, and a slab excellent in internal quality can be obtained. Therefore, the method of the present invention can be widely applied as a continuous casting method of a slab having good internal quality.
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Abstract
Description
δ(x)=exp[-1.5×{ln(x/(200×(ΔR/ΔR0)0.587))}2]×δmax ・・・(1)
δmax=L0×(E/E0)0.5×(ΔR/ΔR0)×(t/t0)0.446 ・・・(2)
ここで、上記(1)式および(2)式中の各記号は下記の諸量を意味する。
x:鋳片短辺面の打撃位置を0とする、鋳片幅方向の距離(mm)、
δ(x):位置xにおける鋳片厚さ方向の変位(mm)、
δmax:鋳片厚さ方向の最大変位(mm)、
ΔR:短辺面を打撃する位置のガイドロールの軸間距離(mm)、
E:1セグメント片側当たりの打撃エネルギー(J)、
t:鋳片短辺面の打撃位置における鋳片の未凝固厚さ(mm)、
ただし、E0=39(J)、ΔR0=245(mm)、t0=26(mm)、L0=0.114(mm)である。
1-1.鋳造試験条件
図1は、本発明の連続鋳造方法を適用可能な連続鋳造機と打撃振動装置の配置を示す図であり、(a)は連続鋳造機の側面図を示し、(b)は連続鋳造機の打撃振動装置を設置した部分の平面図を示す。同図に示す連続鋳造機は、垂直曲げ型であり、鋳片の打撃振動装置を備える。
鋳片の短辺面を打撃しながら行った連続鋳造によって得られた鋳片の内部品質の評価を、中心ポロシティの発生状況を評価することにより行った。
中心ポロシティの発生状況は下記の方法により評価した。鋳片から採取した中心ポロシティの比体積算出用の試料は、比重測定の精度を勘案し、長さ(鋳片の厚さ方向)50mm、幅(鋳片の幅方向)100mm、厚さ(鋳片の鋳造方向)7mmの直方体とし、表面の加工精度はJISに基づく上仕上げ(三角記号▽▽▽:最大表面粗さ3.2μm)とした。中心ポロシティの発生がほとんどないとみられる鋳片の表面から厚さ方向に厚さの1/4の位置(以下、「1/4厚さ位置」ともいう)の密度を基準とし、厚さ中心部の密度から算出した中心ポロシティの比体積により中心ポロシティの発生状況を評価した。中心ポロシティ比体積Vpは、1/4厚さ位置の平均密度ρ0と、厚さ方向の中心の平均密度ρにより、下記(1)式で定義した。
Vp≡1/ρ-1/ρ0 ・・・(1)
-ΔVp≡Vp0-Vp1 ・・・(2)
図3は、1セグメント片側当たりの打撃エネルギーと中心ポロシティ比体積の減少量との関係を示すグラフである。同グラフは、異なる打撃エネルギーで打撃を行った各鋳片について、中心ポロシティ比体積の減少量-ΔVpを算出し、整理したものである。同グラフに示される関係から、1セグメント片側当たりの打撃エネルギーEが25Jを超えると、鋳片幅方向の端部において、中心ポロシティ比体積が減少する関係が確認された。同グラフにおける、1セグメント片側当たりの打撃エネルギーEと中心ポロシティ比体積の減少量-ΔVpとの関係について回帰式を算出すると、下記(3)式となる。
-ΔVp[cm3/g]=0.0049347×E[J]-1.297487 ・・・(3)
上記の知見を基に、さらに本発明者らは、鋳片短辺の打撃に関する上記結果の一般化を検討した。
L/L0=(E/E0)0.5 ・・・(a)
L/L0=(E/E0)0.5×(ΔR/ΔR0)×f(t,t0) ・・・(b)
ここで、f(t,t0)は鋳片の未凝固厚さの影響項を表す。f(t,t0)が無次元量t/t0の累乗に比例すると仮定すると、実験シミュレーション結果からfの一例として下記(c)式が得られた。
f(t,t0)=(t/t0)0.446 ・・・(c)
δmax≒δx=200mm=L0×(E/E0)0.5×(ΔR/ΔR0)×(t/t0)0.446 ・・・(4)
ここで、上記(4)式中の各記号は下記の諸量を意味する。
E:1セグメント片側当たりの打撃エネルギー(J)、
ΔR:短辺面を打撃する位置のガイドロールの軸間距離(mm)、
t:鋳片短辺面の打撃位置における鋳片の未凝固厚さ(mm)。
また、E0、ΔR0およびt0はそれぞれE、ΔRおよびtの中心ポロシティ低減効果がもっとも大きかった条件の数値、L0は中心ポロシティ低減効果がもっとも大きかった場合の鋳片厚さ方向の最大変位の代表条件であり、それぞれ下記の定数群(5)である。以下、この条件を条件(5)ともいう。
E0=39(J)、ΔR0=245(mm)、t0=26(mm)、L0=0.114(mm) ・・・(5)
δ(x)=exp[-1.5×{ln(x/(200×(ΔR/ΔR0)0.587))}2]×δmax ・・・(6)
図6は、鋳片厚さ方向の最大変位δmaxと中心ポロシティ比体積の減少量-ΔVpとの関係を示すグラフである。同グラフに示される関係は、前記(3)式と、前記条件(5)を適用してΔR=245(mm)、t=26(mm)とした前記(4)式とからδmaxと-ΔVpとの関係を求め、作成したものである。鋳片短辺面の打撃位置における鋳片の未凝固厚さtについては、鋳造速度0.7m/minの場合の伝熱凝固計算により打撃振動装置8が配置されたセグメントの入口における未凝固厚さを算出し、その値を用いた。
上記(6)式をxについて解くと、鋳片厚さ方向の変位δおよび短辺面を打撃する位置におけるガイドロールの軸間距離ΔRの関数として下記(7)式が得られる。
x=200×(ΔR/ΔR0)0.587×exp[{-ln(δ/δmax)/1.5}0.5] ・・・(7)
図8は、ガイドロールの軸間距離を変更した場合についての、1セグメント片側当たりの打撃エネルギーと振動到達距離との関係を示すグラフである。図8は、ガイドロールの軸間距離ΔRが245mmまたは400mmであること以外は、図7と同様の条件で打撃した場合についてのグラフである。同グラフに示される関係から、ガイドロールの軸間距離ΔRを245mmから400mmに広げると、振動到達距離x*が増大することがわかる。つまり、鋳片が、長辺長さと短辺長さの比が大きいスラブである場合には、鋳片幅が広く、ガイドロール間でのバルジングが生じやすいため、ガイドロールの軸間距離ΔRを大きく取ることができない。一方、鋳片が、長辺長さと短辺長さの比が小さいブルームである場合には、鋳片幅が狭く、ガイドロール間でのバルジングは少ないため、ガイドロールの軸間距離ΔRを大きく取ることができるので、打撃の効果を広い範囲で得ることができる点で有利である。
図9は、鋳片の幅方向両端のそれぞれの短辺面からの打撃の影響を示すグラフである。同グラフは、横軸を鋳片の幅方向中央から短辺面に垂直な方向の距離yとし、縦軸を鋳片厚さ方向の変位δとしている。打撃した鋳片は幅約400mmのブルームとし、ガイドロールの軸間距離ΔRを400mm、1セグメント片側当たりの打撃エネルギーEを45Jとして、鋳片の鋳造方向左側の短辺面のみ、または右側の短辺面のみを打撃した場合と、両側の短辺面を同時に打撃した場合とについての計算結果を示す。同グラフに示される結果から、鋳片の鋳造方向左側の短辺面のみを打撃した場合の鋳片厚さ方向の変位δLおよび右側の短辺面のみを打撃した場合の鋳片厚さ方向の変位δRを重畳すると、鋳片の両側の短辺面を同時に打撃した場合の鋳片厚さ方向の変位δDとなることがわかる。
Claims (2)
- 横断面が矩形の鋳片を鋳造する際に、未凝固部を含む鋳片の短辺面の両側に、打撃振動装置を少なくとも一対配置し、前記鋳片の短辺面を連続して打撃することにより、前記鋳片に振動を付与しつつ鋳造する鋼の連続鋳造方法であって、
前記短辺面の打撃により、下記(1)式および(2)式で定義される前記鋳片の長辺面の鋳片厚さ方向の変位曲線δ(x)と直線δ(x)=0.10mmとの交点が2箇所発生し、前記交点のうち、原点から遠いほうの交点の前記鋳片短辺面の打撃位置から鋳片幅方向の距離が200mm以上となるように、振動エネルギー、ガイドロールの軸間距離および未凝固厚さを調整して、短辺面を打撃することを特徴とする鋼の連続鋳造方法。
δ(x)=exp[-1.5×{ln(x/(200×(ΔR/ΔR0)0.587))}2]×δmax ・・・(1)
δmax=L0×(E/E0)0.5×(ΔR/ΔR0)×(t/t0)0.446 ・・・(2)
ここで、上記(1)式および(2)式中の各記号は下記の諸量を意味する。
x:鋳片短辺面の打撃位置を0とする、鋳片幅方向の距離(mm)、
δ(x):位置xにおける鋳片厚さ方向の変位(mm)、
δmax:鋳片厚さ方向の最大変位(mm)、
ΔR:短辺面を打撃する位置のガイドロールの軸間距離(mm)、
E:1セグメント片側当たりの打撃エネルギー(J)、
t:鋳片短辺面の打撃位置における鋳片の未凝固厚さ(mm)、
ただし、E0=39(J)、ΔR0=245(mm)、t0=26(mm)、L0=0.114(mm)である。 - 前記鋳片の相対する左右の短辺面を周期的に打撃する時間の位相を同一とすることにより、前記左右の短辺面それぞれにおける打撃によって発生する前記変位δ(x)を互いに重畳させ、該重畳された変位δ(x)を打撃位置の幅方向全体に亘って0.10mm以上とすることを特徴とする請求項1の鋼の連続鋳造方法。
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