CN110366456A - The manufacturing method of the cooling means of steel plate and the cooling device of steel plate and steel plate - Google Patents
The manufacturing method of the cooling means of steel plate and the cooling device of steel plate and steel plate Download PDFInfo
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- CN110366456A CN110366456A CN201880015172.2A CN201880015172A CN110366456A CN 110366456 A CN110366456 A CN 110366456A CN 201880015172 A CN201880015172 A CN 201880015172A CN 110366456 A CN110366456 A CN 110366456A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2275/00—Mill drive parameters
- B21B2275/02—Speed
- B21B2275/06—Product speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
- B21B37/76—Cooling control on the run-out table
Abstract
The object of the present invention is to provide the manufacturing methods of the cooling device and steel plate of the cooling means that few steel plate is deformed in carrying out cooling control cooling while being constrained the steel plate after hot rolling with roller and steel plate.The cooling means of steel plate, it conveys steel plate using along steel plate conveying direction with the multiple rollers for providing spacing configuration in the state of constraining steel plate, using cooling nozzles of the configuration between multiple rollers to the upper and lower surface spray cooling water of steel plate, to which steel plate is cooling, in the cooling means of the steel plate, cooled down with meeting the plate speed V of following formula (1).V > 2.21 × 10‑5×Cv×L3×t‑2×(24.2+204.3×(L/W)2)‑1... (1) wherein, in formula (1), V: plate speed (m/s), Cv: the cooling velocity (DEG C/s) for the steel plate mean temperature in plate thickness direction, L: roller spacing (m), t: plate thickness (m), W: plate is wide (m).
Description
Technical field
It is cold the present invention relates to implementing to lead to overcooled control in the state of constraining the high-temperature steel plate of hot rolling using roller
But.In particular to 10mm or less is as thin as plate thickness and plate width is the thick steel plate of 3000mm or more (hereinafter, sometimes referred to simply as steel
Plate) the steel plate cooling means of the few steel plate of deformation and the manufacturing method of cooling device and steel plate can be manufactured.
Background technique
In the manufacture of steel plate, therefore, to assure that engineering properties required by steel plate, especially intensity and toughness.In order to reach
Above-mentioned requirements implement the directly cooling of the high-temperature steel plate after rolling or are temporarily air-cooled to room temperature then offline (offline) to carry out
Reheat the operation of quenching.In the cooling, in order to ensure the characteristic in terms of material required by steel plate, need to increase cooling speed
Degree.Meanwhile in order to ensure deforming (cooling strain, cooling-distortion) when the uniformity of material, inhibition are cooling,
Cooling is equably carried out in the range of steel plate entire surface to be important.In the case where cooling strain occurs, need for cooling
Steel plate afterwards ensures flatness using straighteners such as roller straightener, pressuring machines, therefore can generate additional process, to become contracting
The considerable hurdle of casual labourer's phase.
In order to cope with above situation, currently, for the cooling of steel plate, be widely implemented using multiple rollers constraint steel plate,
Between the constraint roll configure cooling nozzles, on one side make steel plate by while carry out cool down (being known as passing through cooling) method,
Thus manufacture deforms few steel plate.
As using the above method to carry out the cooling reason of control, following reasons can be enumerated: carry out by cooling can with compared with
Short device length realizes cooling, therefore is able to suppress initial investment cost.In addition, constraint roll can inhibit due to the steel in cooling
Uneven and generation the deformation of Temperature Distribution in plate upper and lower surface, steel plate surface, and by configuring cooling nozzles between roller,
So that cooling water will not flow out to cooling device, so that cooling water be prevented to be stranded in the situation on steel plate.
From the viewpoint of above, for example, describing following method in patent document 1: for by steel plate temperature after cooling
Degree distribution it is uneven caused by shape defect, predict to generate in steel plate based on the measurement of the Temperature Distribution of steel plate after cooling
Residual stress, to judge whether to need to align.
In addition, describing following method in patent document 2: the arch warpage (camber) occurred in water cooling from inhibition
Viewpoint considers, is conceived to constraint roll, the pact of required constraint roll for the function as the roller spacing of constraint roll, steel plate thickness
Apply load in the range of beam force, to manufacture the good steel plate of flatness.
Existing technical literature
Patent document
Patent document 1: No. 2843273 bulletins of Japanese Patent No.
Patent document 2: No. 3925789 bulletins of Japanese Patent No.
Summary of the invention
Problems to be solved by the invention
Though can be manufactured using the method as illustrated in above-mentioned and deform few steel plate, even if ensuring width direction, up and down
The temperature uniformity on surface is simultaneously cooled down, however it remains the case where deforming.Therefore, hair of the present inventor to deformation
Life is studied, as a result, it has been found that, bending deformation (buckling caused by the contraction in steel plate width direction when water cooling
Strain) cooling strain is generated.It specifies for the cooling strain as caused by bending deformation, and board width thin in plate thickness
In the case where wide steel plate, it is not easy to show the method bring reducing effect as illustrated in above-mentioned, is especially in plate thickness
When the cooling of steel plate that 10mm or less and plate width are 3000mm or more, even if ensuring that width direction, the temperature of upper and lower surface are uniform
Property and cooled down, still can deform.
For bending deformation caused by the contraction in steel plate width direction when water cooling, mechanism with set so far
Difference is deformed caused by the temperature deviation as upper and lower surface thought, it is therefore contemplated that even if being cooled down with previous method,
Still it can deform.For the method predicted as patent document 1 based on steel plate Temperature Distribution after cooling, meeting
The deformation bigger than the plate shape predicted occurs.Therefore, forecasting inaccuracy is true, it is difficult to cut down the incidence of aligning.In addition, patent
In document 2, although being able to suppress the deformation as caused by the temperature deviation of upper and lower surface, it is wide plate adjoint when water cooling is not accounted for
Bending deformation caused by shrinking, therefore, region thin for plate thickness and that board width is wide is displayed without effect.
Therefore, the present invention is to solve above-mentioned problem of the prior art point as project, and its purpose is to provide in one side roller
The steel plate Jing Guo hot rolling is constrained to carry out deforming the cooling means of few steel plate and the cooling of steel plate in cooling control cooling on one side
The manufacturing method of device and steel plate.
Means for solving the problems
Purport of the invention is as follows.
[1] cooling means of steel plate, using along steel plate conveying direction to provide multiple rollers of spacing configuration by steel plate
Steel plate is conveyed in the state of constraint, and utilizes upper and lower surface spray cooling of cooling nozzles of the configuration between multiple rollers to steel plate
Water, thus steel plate is cooling, in the cooling means of the steel plate,
It is cooled down with meeting the plate speed V of following formula (1),
V > 2.21 × 10-5×Cv×L3×t-2×(24.2+204.3×(L/W)2)-1…(1)
Wherein, in formula (1),
V: plate speed (m/s)
Cv: the cooling velocity (DEG C/s) for the steel plate mean temperature in plate thickness direction
L: roller spacing (m)
T: plate thickness (m)
W: plate is wide (m).
[2] cooling means of the steel plate as described in [1], wherein plate thickness t is 10mm or less.
[3] cooling means of the steel plate as described in [1] or [2], wherein the wide W of plate is 3000mm or more.
[4] cooling device of steel plate, has:
Multiple rollers, the multiple roller provide that spacing is configured along steel plate conveying direction, steel plate are constrained and conveyed；
Cooling nozzles, the cooling nozzles configuration is between multiple rollers, to the upper and lower surface spray cooling water of steel plate, to steel plate
It is cooled down；With
Control mechanism, the control mechanism control plate speed V in a manner of meeting following formula (1),
V > 2.21 × 10-5×Cv×L3×t-2×(24.2+204.3×(L/W)2)-1…(1)
Wherein, in formula (1),
V: plate speed (m/s)
Cv: the cooling velocity (DEG C/s) for the steel plate mean temperature in plate thickness direction
L: roller spacing (m)
T: plate thickness (m)
W: plate is wide (m).
[5] cooling device of the steel plate as described in [4], wherein plate thickness t is 10mm or less.
[6] cooling device of the steel plate as described in [4] or [5], wherein the wide W of plate is 3000mm or more.
[7] manufacturing method of steel plate uses cooling means described in any one of [1]~[3] to the steel plate after hot rolling
It is cooled down, and manufactures steel plate.
Invention effect
Few steel plate is deformed according to the present invention it is possible to manufacture.It particularly, can be by being applied at the offline heat of thick steel plate
It manages and plays its effect.
Detailed description of the invention
[Fig. 1] Fig. 1 is the signal for indicating to have used a part of the manufacturing equipment of cooling device of steel plate of the invention to constitute
Figure.
[Fig. 2] Fig. 2 is the figure for illustrating bending deformation when steel plate is cooling, and (a) is the structure for indicating cooling device of the invention
At schematic diagram, (b) to illustrate that steel plate is cooling when steel plate the wide W of plate variation figure.
[Fig. 3] Fig. 3 is the figure for indicating an example of shape defect (Bian Lang) of steel plate.
[Fig. 4] Fig. 4 is the figure for illustrating the definition of steepness λ.
[Fig. 5] Fig. 5 is the figure for indicating the relationship of roller spacing L and steepness λ.
[Fig. 6] Fig. 6 is the figure for indicating the relationship of cooling velocity Cv and steepness λ.
[Fig. 7] Fig. 7 is the figure for indicating the relationship of plate speed V and steepness λ.
[Fig. 8] Fig. 8 is the figure for illustrating bending deformation when cutting a part of steel plate (steel plate between roller spacing L).
[Fig. 9] Fig. 9 is the figure for indicating the relationship square between buckling coefficient k of the roller spacing L and wide W of plate.
Specific embodiment
Firstly, being bent caused by the contraction in steel plate width direction when to the reason of being considered as cooling strain, water cooling
Song deformation is illustrated.Fig. 1 is showing for a part composition for the manufacturing equipment for indicating to have used cooling device of steel plate of the invention
It is intended to.The steel plate 1 of the regulation plate thickness manufactured in rolling machine production line is delivered to the manufacturing line of Fig. 1.Utilize heating furnace
After steel plate 1 is heated to defined temperature by 10, on one side utilizing multiple rollers 2 to convey steel plate 1 while constraining steel plate 1, existed using setting
Multiple cooling nozzles 3 between each roller 2 are cooled down.It should be noted that the arrow in figure is the conveying direction of steel plate.In addition,
Roller 2 and cooling nozzles 3 are set to the upper and lower surface of steel plate 1.Cooling device of the present invention have roller 2, cooling nozzles 3 and
The control mechanism (not shown) of plate speed V is controlled in a manner of meeting aftermentioned formula (1).
Fig. 2 (a) is the schematic diagram for indicating the composition of cooling device of steel plate of the invention.As shown in Fig. 2 (a), 1 edge of steel plate
Conveying direction by roller 2-0, roller 2-1 ... the multiple rollers 2 such as roller 2-i, roller 2-n constrain upper and lower surfaces.Between each roller 2, cooling nozzles
3 are respectively arranged at the upper and lower surface of steel plate 1.
Fig. 2 (b) is the figure for illustrating the variation of the wide W of plate of steel plate when steel plate is cooling, is viewed from above by Fig. 2 (a)
Shown in steel plate cooling device in when, the figure of the variation of the wide W of plate of steel plate 1.The plate of steel plate 1 when by by each roller 2 is wide
It is set as W, when the roller spacing on steel plate conveying direction is set as L, steel plate 1 is shunk due to water cooling.For example, steel plate is from roller 2-0 to roller
In the case that 2-1 is mobile, as shown in Fig. 2 (b), plate is wide only to shrink Δ W (Δ=W0-W1, it should be noted that W0: pass through roller 2-0
When plate it is wide, W1: plate when by roller 2-1 is wide.).At this moment, become and be equal to the steel plate for keeping board width wide and the narrow steel of board width
The state that plate is engaged in a manner of becoming same widths, therefore, the wide part of board width (such as the wide W of plate0) by big compression
Stress.In the present invention, the deformation of steel plate caused by the compression stress is known as bending deformation.
At this moment, the systolic gradient in the case where plate speed is slow or cooling velocity is fast, for its conveying direction
Δ W/L becomes precipitous, therefore generates big compression stress, becomes easy generation bending deformation.In addition, plate thickness is thin and board width is wide
In the case where, the rigidity of plate reduces, therefore reduces for the patience of compression stress, equally becomes easy generation bending deformation.
Therefore, in order to confirm the contractile mechanism of the wide W of above-mentioned plate, in actual manufacturing line, in plate speed
V, the cooling shape of steel plate and the relationship of each cooling condition carry out under the conditions of the wide W of plate thickness t, plate, cooling velocity Cv etc. are various
Investigation.Specifically, the manufacture that the steel plate 1 of the plate thickness 6mm~10mm manufactured in rolling machine production line is delivered to Fig. 1 is produced
Line, after being heated to 950 DEG C using heating furnace (hearth roll heating furnace) 10, on one side utilize roller 2 constraint, while utilize cooling nozzles 3
It carries out being cooled to 100 DEG C.To whether from plate profile after cooling occur bending deformation judged.
Fig. 3 be indicate have occurred shape defect steel plate shape an example figure, the edge part of steel plate 1 have occurred by
The shape defect of referred to as so-called side wave.Steepness (steepness) λ of expression is defined using Fig. 4 and as shown in following formula (2)
(%) is by the bad quantification of the side shape wave shape.It should be noted that side wave not only occurs only at one, but in the two of steel plate
Many places occur for end.Therefore, the value of δ/P in following formula (2) is the average value for betiding whole sides wave at steel plate both ends.
λ=(δ/P) × 100 ... (2)
Wherein, in formula (2),
λ: steepness (%)
δ: wave height (m)
P: unrestrained spacing (m).
Quantification as a result, the unrestrained spacing P that the steel plate of shape defect has occurred is 0.6~1.4m or so.About steepness
Acceptable value, if when for example welding multiple plates there are biggish shape defect, may require that constraint steel plate possessed by
The operation etc. for deforming and being welded in the state of making it become flat, it is therefore preferable that steepness is as small as possible.As conventional base
Standard, when the unrestrained spacing P on steel plate conveying direction is 2m, it is desirable that make the high δ 10mm or less of wave.Therefore, in the present invention, it is believed that steep
Spending λ to be less than (10/2000) × 100=0.5% is no bending deformation, and λ is judged as that there are bending deformations for 0.5% or more.
Fig. 5 is to indicate setting plate thickness t=10mm, the wide W=3000mm of plate, plate speed V=0.58m/s, cooling velocity Cv
The figure of the relationship of the steepness λ of roller spacing L and side shape wave shape when=220 DEG C/s.Confirming roller spacing L becomes shorter, then steepness λ
Become smaller.Roller spacing L is not generate side wave in 600mm situation below.
Fig. 6 is to indicate setting plate thickness t=10mm, the wide W=3000mm of plate, plate speed V=0.58m/s, roller spacing L=
The figure of the relationship of the steepness λ of cooling velocity Cv and side shape wave shape when 750mm.Confirming cooling velocity Cv becomes smaller, then suddenly
Degree λ becomes smaller.Cooling velocity Cv is not generate side wave in 110 DEG C/s situation below.
Fig. 7 is to indicate for setting plate thickness t=6mm, roller spacing L=750mm, Cv=300 DEG C of cooling velocity/s, for plate
The figure of the relationship of the plate speed V and steepness λ of steel plate in the case that wide W is 1500mm and the wide W of plate is 3000mm.Either plate is wide
It is faster to confirm plate speed V, then steepness λ becomes smaller.In addition, plate speed V is 1.8m/s when the wide W of plate is 1500mm
Side wave is not generated in the case where above.On the other hand, when the wide W of plate is 3000mm, in the case that plate speed V is 3.0m/s or more
Side wave is not generated.From the above results, in the identical situation of plate speed, the plate wide the big, and shape becomes poorer.
It should be noted that plate thickness is thicker for thick steel plate, then when cooling down more at surface of steel plate and steel plate center
Generate temperature difference.Therefore, cooling velocity Cv herein is the cooling velocity for the mean temperature in plate thickness direction.
By above-mentioned opinion it is found that bending deformation can be described as due to plate speed V, cooling velocity Cv, roller spacing L, plate thickness
T, the wide W of plate and occur.Therefore, present inventor is further studied, as a result, it has been found that, as long as meeting by following formula
(1) the plate speed V indicated, then will not occur bending deformation, can obtain deforming few steel plate.
V > 2.21 × 10-5×Cv×L3×t-2×(24.2+204.3×(L/W)2)-1…(1)
Wherein, in formula (1),
V: plate speed (m/s)
Cv: the cooling velocity (DEG C/s) for the steel plate mean temperature in plate thickness direction
L: roller spacing (m)
T: plate thickness (m)
W: plate is wide (m).
Hereinafter, being illustrated to the export of above-mentioned formula (1).
According to elasticity handbook (Japanese: elasticity Ha Application De Block ッ Network) (Central Plains etc., 2001, towards storehouse bookstore, P.264),
The critical compression stress of buckling is described below.
[mathematical expression 1]
[mathematical expression 2]
In above-mentioned formula,
σe: critical buckling stress (MPa)
K: buckling coefficient
E: Young's modulus (MPa)
π: pi
ν: Poisson's ratio
T: plate thickness (m)
L: roller spacing (m)
W: plate is wide (m)
M: unrestrained number (usually taking 1).
It should be noted that L is recorded as plate length in elasticity handbook, but since this is the body constrained with roller
System, therefore, from the walking direction of stress, replaces with roller spacing for L.In addition, formula (4) is Elementary Analysis about buckling coefficient k
An example.Actually due to the variation of the restrained condition of steel plate etc., the buckling coefficient as the formula (4) will not be become.Cause
It is suitable for modifying buckling coefficient k and utilizing in a manner of tallying with the actual situation that this, which is mostly with reference to formula (4),.
As shown in Figure 8, when considering to cut steel plate (steel plate between roller spacing L) between the roller of a part, based on entrance between roller
Outlet side temperature between side temperature and roller, the compression stress applied along the width direction of steel plate can be described below.
[mathematical expression 3]
σα=α E (Tin-Tout)…(5)
In above-mentioned formula,
σa: the compression stress (MPa) of width direction
α: linear expansion coefficient (1/ DEG C)
E: Young's modulus (MPa)
Tin: entrance side temperature (DEG C) between roller
Tout: outlet side temperature (DEG C) between roller.
When having carried out cooling between roller with constant cooling velocity, entrance side temperature T between the roller of above-mentioned formula (5)inAnd roller
Between outlet side temperature ToutIt can be described below.
[mathematical expression 4]
In above-mentioned formula,
Cv: cooling velocity (DEG C/s)
V: plate speed (m/s).
That is, the stress in compression sigma of width directionaIt can be described below.
[mathematical expression 5]
Due to the stress in compression sigma of width directionaLess than critical buckling stress σeIn the case where without flexing, therefore, as long as
Bending deformation will not then occur for the relational expression for meeting formula (8).
[mathematical expression 6]
Formula (8) are rewritten for plate speed V, then as shown below.
[mathematical expression 7]
It should be noted that Poisson's ratio ν and thermalexpansioncoefficientα have eigenvalue in the case where steel, therefore, as
When constant considers, the plate speed V of without flexing deformation can be described below.(it is envisioned for the operation of high temperature range, Poisson's ratio ν
And thermalexpansioncoefficientα is respectively with ν=0.3, α=2.0 × 10-5Conversion)
[mathematical expression 8]
Buckling coefficient k is the following formula (11) as derived from above-mentioned formula (10).
[mathematical expression 9]
Herein, buckling coefficient k is therefore process characteristic value carries out various experiments using real machine, practically finds out buckling system
Number k.In fact, in order to find out buckling coefficient k, as experiment condition, set plate thickness t as 5~15mm, the wide W of plate be 3000~
5000mm, roller spacing L are 500~750mm, plate speed is 0.3~2.0m/s.
On the other hand, be based on above-mentioned formula (4), it can be said that the buckling constant k on the boundary of actually buckling and, roller spacing L and
The wide W's of plate is square related.Formula is deviateed due to constraint, deformation condition of each end etc. as it was noted above, there are buckling coefficient k
(4) the case where theoretical formula, there is also the examples that (W/L) item is for example omitted in the case where there is shearing force.Therefore, this to
Omit (W/L) item in the case where using the practical buckling coefficient k found out of real machine, with the roller spacing L and wide W of plate square relationship into
Row is drawn.The results are shown in Fig. 9.In Fig. 9, zero indicates steepness λ less than 0.5%, and × expression steepness λ is 0.5% or more.According to figure
9, it may be said that actually there are correlativities between the buckling constant k and steepness λ on the boundary of generation buckling.
According to Fig. 9's as a result, buckling coefficient k can be indicated with relationship below.
K=204.3 (L/W)2+24.2…(12)
By the way that the plate speed V of formula (10) and formula (12) combination, without flexing can be indicated with following formula (1).
V > 2.21 × 10-5×Cv×L3×t-2×(24.2+204.3×(L/W)2)-1…(1)
Wherein, in formula (1),
V: plate speed (m/s)
Cv: the cooling velocity (DEG C/s) for the steel plate mean temperature in plate thickness direction
L: roller spacing (m)
T: plate thickness (m)
W: plate is wide (m).
It should be noted that roller spacing L is the parameter constituted from machinery, it therefore, can not be changed after machinery setting
Parameter.In addition, the wide W of plate thickness t, plate, cooling velocity Cv are parameters related with product characteristics are determined, these parameters also can not letter
Singly change.Therefore, the parameter i.e. plate speed V that being conceived to can operationally be suitable for change arranges formula (1).
By above-mentioned formula (1) it is found that for bending deformation, plate thickness t is thinner, roller spacing L is wider, cooling velocity Cv more
Fastly, then it in the case where board width is wide, more needs to be cooled down in order not to make its bending deformation with fast plate speed V.This
Place, roller spacing L, cooling velocity Cv, plate speed V are the intrinsic values of cooling equipment, and the wide W of plate thickness t, plate then depends on product.Separately
On the one hand, cooling velocity Cv is the flow of the cooling water of cooling device, and plate speed V is the revolving speed of roller-way, can be become respectively
More.Therefore, the roller spacing (example of cooling device is designed as far as possible shortly previously according to the range of manufacture type in the design phase
Such as 500mm spacing), the revolving speed of roller-way is designed to rotate the flow of (such as reaching 2m/s or more), cooling water as quickly as possible
Adjustable range be also designed to wide in range form.In addition, the case where can not shorten roller spacing L using existing equipment etc.
Under, the adjustable range of the flow by widening cooling water can carry out cooling with small flow to slow down cooling velocity Cv, this is
Effectively (for example, plate thickness 10mm, 100 DEG C/s or less).Manufacture hot strip mill (hot strip mill), the thickness of hot rolled strip
On the line of steel plate in (on line) control cooling, when plate thickness is the thickness of 10mm, plate speed becomes about 2.5m/s or so, speed
Degree is very fast, therefore, is not susceptible to such bending deformation.On the other hand, in the cooling when heat-treated offline of thick steel plate, due to
Draw speed linkage with heating furnace carries out water cooling, therefore plate speed becomes 1.0m/s or so, therefore, is easy to happen such as this hair
Bending deformation illustrated in bright.
In conclusion keeping steel plate cooling by the plate speed V to meet above-mentioned formula (1), so as to make in the present invention
Make the few steel plate of cooling strain.In the present invention, steel plate thin for plate thickness and that board width is wide can play effect.Particularly suitable for plate thickness
For the cooling for the thick steel plate that 10mm or less and/or plate width are 3000mm or more, the heat-treated offline of thick steel plate can be applied to.
Embodiment 1
Using manufacturing equipment shown in FIG. 1, keep steel plate cooling.Herein, the heating temperature in heating furnace 10 is set as 930 DEG C,
Plate thickness is set as being easy to happen plate thickness 5mm, 10mm, 12mm of bending deformation.Cooling nozzles 3 are multiple flat using arranging in the width direction
Nozzle made of flat nozzle (flat spray).Cooling water inflow can change, the plate thickness 5mm's in the case where injection maximum amount of water
The cooling velocity of thick steel plate is 400 DEG C/s, and cooling velocity when spraying minimum discharge is 100 DEG C/s.It should be noted that by cold
But water is set as constant, and in the case that only change plate thickness carries out cooling, cooling velocity is inversely proportional with plate thickness.Plate thickness is as a result,
Maximum cooling velocity in the case where 10mm is 200 DEG C/s, and minimum cooling velocity is 50 DEG C/s.In addition, roller spacing L is directed to each item
Part and change.
Plate profile is judged with steepness λ.Steepness λ is judged as that plate profile is flat less than 0.5%, another party
Steepness λ is judged as plate profile bending deformation for 0.5% or more by face.It should be noted that when seeking steepness λ, δ/P be by
It is calculated in the average value for whole sides wave that steel plate both ends generate.
As a result shown in table 1.
[table 1]
Formula (1): V > 2.21 × 10-5×Cv×L3×t-2×(24.2+204.3×(L/W)2)-1
Example of the present invention is cooled down with plate speed more faster than the plate speed V found out in formula (1).Any example of the present invention
Bending deformation does not occur, it is planar.On the other hand, comparative example is with slower than the plate speed V found out in formula (1)
Plate speed cooled down.Bending deformation has occurred under full terms in any comparative example.As a result, whole steel of comparative example
Plate uses roller straightener to carry out shape aligning and shipment after the cooling period.Whole steel plates of example of the present invention can be straight without aligning again
Pick out goods.
It should be noted that driving of the conveying speed control of the heat-treated offline device of common thick steel plate by heating furnace
Mechanisms influence, for conveying speed, the case where being able to carry out the speed control of about 0.02~0.5m/s or so, is more.By reality
The result for applying example will also realize that, especially under the experiment condition of plate thickness 12mm, even if cooling velocity is fast, due to formula (1) of the invention
In plate speed, the i.e. conveying speed that finds out fall into the conveying speed control range of real machine, therefore, be also easy adjustable shape.
In addition, for the steel plate narrow for board width, similarly, due to plate speed, the i.e. conveying speed found out in formula (1) of the invention
Degree is fallen into the conveying speed control range of real machine, therefore, is also easy adjustable shape.On the other hand, particularly, for the present invention
Cooling velocity control, for the change etc. of roller spacing, in the steel that plate thickness is 10mm or less and/or plate width is 3000mm or more
In plate, there are plate speed, the i.e. conveying speed found out in formula of the invention (1) become real machine conveying speed control range outside
The case where.Thus, it can be known that when implementing the present invention for the steel plate that plate thickness is 10mm or less and/or plate width is 3000mm or more, it is cold
But speed control, change of roller spacing etc. are required.In addition we know, particularly, plate thickness is as thin as 5mm and plate width is 5000mm's
Under the conditions of, it is the 2.0m/s slightly faster than common equipment by not only making narrow control to 500mm, also by plate speed of roller spacing,
So as to prevent bending deformation.
Description of symbols
1 steel plate
2 rollers
2-0 roller
2-1 roller
2-i roller
2-n roller
3 cooling nozzles
10 heating furnaces (hearth roll heating furnace)
δ wave is high
P wave spacing
Claims (7)
1. the cooling means of steel plate, using along steel plate conveying direction to provide that multiple rollers of spacing configuration are constraining steel plate
Steel plate is conveyed under state, and using cooling nozzles of the configuration between multiple rollers to the upper and lower surface spray cooling water of steel plate, thus
Steel plate is cooling, in the cooling means of the steel plate, cooled down with meeting the plate speed V of following formula (1),
V > 2.21 × 10-5×Cv×L3×t-2×(24.2+204.3×(L/W)2)-1…(1)
Wherein, in formula (1),
V: plate speed (m/s)
Cv: the cooling velocity (DEG C/s) for the steel plate mean temperature in plate thickness direction
L: roller spacing (m)
T: plate thickness (m)
W: plate is wide (m).
2. the cooling means of steel plate as described in claim 1, wherein plate thickness t is 10mm or less.
3. the cooling means of steel plate as claimed in claim 1 or 2, wherein the wide W of plate is 3000mm or more.
4. the cooling device of steel plate, has:
Multiple rollers, the multiple roller provide that spacing is configured along steel plate conveying direction, steel plate are constrained and conveyed；
Cooling nozzles, the cooling nozzles configuration, to the upper and lower surface spray cooling water of steel plate, carry out steel plate between multiple rollers
It is cooling；With
Control mechanism, the control mechanism control plate speed V in a manner of meeting following formula (1),
V > 2.21 × 10-5×Cv×L3×t-2×(24.2+204.3×(L/W)2)-1…(1)
Wherein, in formula (1),
V: plate speed (m/s)
Cv: the cooling velocity (DEG C/s) for the steel plate mean temperature in plate thickness direction
L: roller spacing (m)
T: plate thickness (m)
W: plate is wide (m).
5. the cooling device of steel plate as claimed in claim 4, wherein plate thickness t is 10mm or less.
6. the cooling device of steel plate as described in claim 4 or 5, wherein the wide W of plate is 3000mm or more.
7. the manufacturing method of steel plate, using cooling means described in any one of claims 1 to 33 to the steel plate after hot rolling into
Row cooling, to manufacture steel plate.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-038973 | 2017-03-02 | ||
| JP2017038973A JP6720894B2 (en) | 2017-03-02 | 2017-03-02 | Steel sheet cooling method, steel sheet cooling device, and steel sheet manufacturing method |
| PCT/JP2018/007743 WO2018159749A1 (en) | 2017-03-02 | 2018-03-01 | Method for cooling steel sheet, cooling device for steel sheet and method for manufacturing steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110366456A true CN110366456A (en) | 2019-10-22 |
| CN110366456B CN110366456B (en) | 2021-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880015172.2A Active CN110366456B (en) | 2017-03-02 | 2018-03-01 | Method and apparatus for cooling steel sheet, and method for manufacturing steel sheet |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP3560616B1 (en) |
| JP (1) | JP6720894B2 (en) |
| KR (1) | KR102303872B1 (en) |
| CN (1) | CN110366456B (en) |
| WO (1) | WO2018159749A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3705587A4 (en) * | 2017-10-31 | 2020-11-25 | JFE Steel Corporation | Facility and method for producing thick steel sheet |
| JP7076323B2 (en) * | 2018-07-31 | 2022-05-27 | 株式会社ユニバーサルエンターテインメント | Pachinko machine |
| CN109794506B (en) * | 2019-04-04 | 2023-10-24 | 哈尔滨工业大学（威海） | Roll forming device and method for hot formed steel plate |
| JP7173377B2 (en) * | 2019-11-25 | 2022-11-16 | Ｊｆｅスチール株式会社 | Steel plate manufacturing equipment and manufacturing method |
| JPWO2022176366A1 (en) * | 2021-02-18 | 2022-08-25 | ||
| CN114130834B (en) * | 2021-11-30 | 2023-08-22 | 宝武集团鄂城钢铁有限公司 | Production method for precisely controlling thickness range of thin steel plate by adopting single-frame rolling mill |
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| JP5626275B2 (en) * | 2011-07-27 | 2014-11-19 | 新日鐵住金株式会社 | Method for cooling hot-rolled steel sheet |
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- 2018-03-01 EP EP18760481.4A patent/EP3560616B1/en active Active
- 2018-03-01 WO PCT/JP2018/007743 patent/WO2018159749A1/en unknown
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20190112085A (en) | 2019-10-02 |
| EP3560616B1 (en) | 2023-01-25 |
| EP3560616A4 (en) | 2020-01-15 |
| JP2018144050A (en) | 2018-09-20 |
| JP6720894B2 (en) | 2020-07-08 |
| WO2018159749A1 (en) | 2018-09-07 |
| EP3560616A1 (en) | 2019-10-30 |
| KR102303872B1 (en) | 2021-09-17 |
| CN110366456B (en) | 2021-08-31 |
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