CN105102142B - The manufacturing equipment and manufacturing method of steel plate - Google Patents
The manufacturing equipment and manufacturing method of steel plate Download PDFInfo
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- CN105102142B CN105102142B CN201480018472.8A CN201480018472A CN105102142B CN 105102142 B CN105102142 B CN 105102142B CN 201480018472 A CN201480018472 A CN 201480018472A CN 105102142 B CN105102142 B CN 105102142B
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- steel plate
- cooling
- cooling water
- descale
- partition
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- 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
- B21B45/04—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 de-scaling, e.g. by brushing
- B21B45/08—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 de-scaling, e.g. by brushing hydraulically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0071—Levelling the rolled product
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The purpose of the present invention is to provide carry out uniformly cooling down the manufacturing equipment and manufacturing method of the steel plate so as to make plate profile excellent in cooling process by realizing the homogenization of oxide skin generated on steel plate surface in descale process.A kind of manufacturing equipment of steel plate, wherein, hot-rolling mill, shape correction device, descale device and accelerated cooling device are configured with this sequentially from carriage direction upstream side, it is 0.10J/mm to make energy density E possessed by the descale device to the cooling water of the surface injection of steel plate2More than.
Description
Technical field
The present invention relates to hot rolling, shape correction and the manufacturing equipment and the manufactures that control the steel plate cooled down for carrying out steel plate
Method.
Background technology
In recent years, as the manufacturing process of steel plate, applying for cooling is controlled to expand.But in general, hot-working thickness steel
Shape, surface texture of plate etc. are not necessarily uniformly.Therefore, temperature unevenness, cooling are also easy to produce in steel plate content in cooling
Steel plate afterwards can be deformed, residual stress, material are uneven etc., thus lead to that quality is bad, operational trouble.
Therefore, Patent Document 1 discloses following methods：Before it will carry out the final passage of finish rolling and just carry out
Descale is carried out in the case of at least one of after the final passage of finish rolling, heat straightening is then carried out, is then deoxygenated
Change skin, and carry out pressure cooling.In addition, Patent Document 2 discloses following methods：After finish rolling, heat straightening is carried out, carry out
Control cooling is carried out after descale again.In addition, Patent Document 3 discloses following methods：It will carry out control cooling
Before, descale is carried out while the impact pressure for controlling cooling water.
Existing technical literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 9-57327 bulletins
Patent document 2：Japanese Patent No. 3796133
Patent document 3：Japanese Unexamined Patent Publication 2010-247228 bulletins
Invention content
Problem to be solved by the invention
But in the method for above patent document 1,2, when actually manufacturing steel plate, there are the following problems：In deoxidation
Pi Zhong, oxide skin will not be completely exfoliated, and can generate oxide skin unevenness due to descale instead, cannot be carried out when controlling and cooling down
Uniform cooling.In addition, in the method for patent document 3, in order not to generate oxide skin unevenness, high impact pressure is needed.Therefore,
There are the following problems：Using oxide skin unevenness can be generated during low impact pressure, as a result, cannot be carried out when controlling and cooling down
Even cooling.
Particularly in recent years, the level of the property uniform in material required by steel plate becomes stringent, it is impossible to ignore as described above
The control cooling generated due to oxide skin unevenness when the unevenness of cooling velocity spare to the material of particularly steel plate width direction
The harmful effect that matter uniformity is brought.
Therefore, the present invention is to be conceived to an open question of above-mentioned conventional example and complete, and its purpose is to provide logical
It crosses the homogenization of oxide skin that realization generates on steel plate surface in descale process and carries out in cooling process uniformly
Steel plate of the cooling so as to make steel plate shape excellent manufacturing equipment and manufacturing method.
The method for solving problem
The present inventor has made intensive studies the power for oxide skin being caused to be removed because of cooling water, as a result, it has been found that, in hot shape
In the case of carrying out descale after correction, if the energy density of the cooling water sprayed from descale device to steel plate is
0.10J/mm2More than, then the scale thickness that the surface after product is made generates becomes uniform.It was found that as a result, from
Accelerated cooling device by when, be nearly free from the deviation of the surface temperature of the width position of steel plate, can be equably
It is cooled down, forms the excellent steel plate of steel plate shape.
The purport of the present invention is as described below.
[1] a kind of manufacturing equipment of steel plate, which is characterized in that by hot-rolling mill, shape correction device, descale device
And accelerated cooling device is configured with this sequentially from carriage direction upstream side, makes above-mentioned descale device to the surface of steel plate
Energy density E possessed by the cooling water of injection is 0.10J/mm2More than.
[2] manufacturing equipment of the steel plate as described in [1], which is characterized in that will be from above-mentioned descale device to above-mentioned
When the travelling speed of accelerated cooling device is set as V [m/s], steel plate temperature before cooling is set as T [K], from above-mentioned deoxidation
The distance L [m] that leather jacket puts above-mentioned accelerated cooling device meets formula L≤V × 5 × 10-9×exp(25000/T)。
[3] manufacturing equipment of the steel plate as described in [2], which is characterized in that so that from above-mentioned descale device to upper
Each device is configured in the mode that the distance L for stating accelerated cooling device is below 12m.
[4] manufacturing equipment of the steel plate as described in any one of [1] to [3], which is characterized in that make from above-mentioned deoxidation
The jet length H on the injection nozzle that leather jacket is put to the surface of above-mentioned steel plate is more than 40mm and below 200mm.
[5] manufacturing equipment of the steel plate as described in any one of [1] to [4], which is characterized in that above-mentioned acceleration cooling dress
Put the collector for having the upper surface supply cooling water to above-mentioned steel plate, the cooling of the rodlike cooling water of injection dangled from the collector
Water injection nozzle and the partition being set between above-mentioned steel plate and above-mentioned collector, also, be provided on above-mentioned partition multiple
The admission port of the lower end of the above-mentioned cooling water injection nozzle of interpolation and the cooling water drainage of upper surface for being fed to above-mentioned steel plate
The discharge outlet being put into above above-mentioned partition.
[6] a kind of manufacturing method of steel plate, according to hot-rolled process, heat straightening process and the sequence for accelerating cooling process
Manufacture steel plate, which is characterized in that have between above-mentioned heat straightening process and cooling process to the surface of steel plate and spray energy
Metric density E is 0.10J/mm2The descale process of above cooling water.
[7] manufacturing method of the steel plate as described in [6], which is characterized in that terminate from above-mentioned descale process to upper
It states the time t [s] that cooling process is accelerated to start and meets formula t≤5 × 10-9×exp(25000/T).Wherein, T is before cooling
Steel plate temperature (K).
Invention effect
According to the present invention, by realizing the homogenization of oxide skin generated on steel plate surface in descale process,
It can uniformly be cooled down in cooling process is accelerated, the excellent steel plate of steel plate shape can be manufactured.
Description of the drawings
Fig. 1 is the skeleton diagram for an example for representing heavy plate rolling production line.
Fig. 2 is the energy density and the product surface in steel plate for representing in descale device, injection cooling water
The figure of the relationship of the scale thickness of generation.
Fig. 3 is the figure for representing in descale device, injection nozzle jet length and the relationship of fluid velocity.
Fig. 4 is the side view of the cooling device of an embodiment of the invention.
Fig. 5 is the side view of other cooling devices of an embodiment of the invention.
Fig. 6 is the figure that the nozzle configuration example to the partition of an embodiment of the invention illustrates.
Fig. 7 is the figure illustrated to the flowing of the cooling draining above partition.
Fig. 8 is the figure illustrated to other flowings of the cooling draining above partition.
Fig. 9 is the figure illustrated to the flowing of the steel plate width direction cooling water of conventional example.
Figure 10 is the figure illustrated to the flowing of the cooling water in accelerated cooling device.
Figure 11 is the non-interfering figure illustrated pair with the cooling draining above the partition in accelerated cooling device.
Specific embodiment
Hereinafter, modes for carrying out the present invention will be described with reference to the drawings.It should be noted that here, to incite somebody to action this
It is described in case of cooling of the invention for the steel plate in heavy plate rolling technique.
Fig. 1 is the skeleton diagram of an example for the heavy plate rolling production line for representing the implementation for the present invention.It will be taken from heating furnace 2
The steel billet gone out implements roughing and finish rolling using roll mill 3, is rolled into the steel plate 1 of regulation plate thickness.Then, deoxidation leather jacket is utilized
4 are put by after the oxide skin generated on the surface of steel plate 1 removing, steel plate 1 is transported to accelerated cooling device with online mode
6.Here, by carrying out accelerating cooling after the shape of steel plate for after cooling to adjust from first shape apparatus for correcting 5
It is suitable for steel plate shape.In accelerated cooling device 6, equipment and lower surface cooling equipment spray are cooled down using from upper surface
Steel plate is cooled to set point of temperature by the cooling water penetrated.Then, as needed using the second shape correction device 7 to steel plate
Shape is corrected.
Descale device 4 is the device for removing the oxide skin generated on the surface of steel plate 1.Descale device 4
In, multiple injection nozzles is made first shape apparatus for correcting 5 to be utilized to carry out the shape of deformation generated on steel plate 1 towards after rolling
The surface of steel plate 1 after correction, from these nozzle spray cooling water.
The present inventor has obtained following opinion：Because descale condition is without fully carrying out oxide skin stripping, instead can
It is uneven to encourage oxide skin.Then, the condition for fully carrying out oxide skin stripping is had made intensive studies, as a result specified：In shape
In the case of carrying out descale after shape correction, as shown in Fig. 2, making from the injection nozzle of descale device 4 to steel plate 1
The energy density E of the cooling water of surface injection is 0.10J/mm2More than, the scale thickness regenerated after being thus allowed to is 5 μm
Hereinafter, and become uniform.It is thought that due to, by descale, oxide skin is temporarily equably completely exfoliated, then, it is thin and
Equably regenerate oxide skin.
In the present invention, the energy density E for making cooling water is 0.10J/mm2Carry out descale above, it as a result, will be
The oxide skin that the surface of steel plate 1 generates removes.Then, the acceleration that steel plate 1 is carried out using accelerated cooling device 6 is cooled down.
In the present invention, the scale thickness of steel plate is made to become thin and uniform by descale, therefore, led to from accelerated cooling device
It is out-of-date, the surface temperature deviation of the width position of steel plate is nearly free from, can equably be cooled down, forms thick steel
The excellent steel plate of plate shape.
Its reason is as described below.For existing rolling equipment, after shape correction in descale device into
When row oxide skin removes, locality stripping occurs for oxide skin sometimes.In this way, oxide skin will not be removed uniformly, therefore generate about
The deviation of 10 μm~about 50 μm of scale thickness distribution.In this case, it is difficult to thickness in accelerated cooling device later
Steel plate is equably cooled down.That is, the steel plate in existing rolling equipment to the deviation for producing scale thickness distribution
When accelerate cooling, the deviation of the surface temperature of width position is big, it is impossible to equably be cooled down.It is as a result, right
Steel plate shape has an impact.
Therefore, the energy density E of cooling water is made to be 0.10J/mm by using descale device 42It is gone above
Oxide skin will not generate the deviation of scale thickness distribution, therefore, steel plate 1 is cooled down using accelerated cooling device 6
When, the deviation of the surface temperature of width position is hardly generated, can equably be cooled down.It as a result, can
Manufacture the excellent steel plate 1 of steel plate shape.In addition, in the present case, even if when impact pressure is low, pass through adjusting
Travelling speed can also realize same descale during with using high impact pressure.
Here, the energy density E (J/mm of the cooling water sprayed to steel plate2) it is that descale is removed by descale
The index of ability is defined as shown in following (1) formulas.
E=Q/ (d × W) × ρ v2/2×t…(1)
Wherein, Q is the injection flow [m of the deoxidation severe edema due to hypofunction of the spleen3/ s], the spray injection thickness [mm] that d is flat burner, W be
Spray injection width [mm], the fluid density ρ [kg/m of flat burner3], steel plate collision when fluid velocity v [m/s], collision
Time t [s] (t=d/1000/V, travelling speed V [m/s]).
But the measure of fluid velocity v during steel plate collision is not necessarily easy, therefore, if (1) is strictly obtained
Energy density E defined in formula then needs a large amount of labours.
Therefore, the present inventor is further studied, as a result, it has been found that, the energy as the cooling water sprayed to steel plate
Density E (J/mm2) simple definition, water yield density × injection pressure × collision time may be used.Here, water yield density (m3/
(mm2Minute)) it is the value calculated with " the injection flow ÷ cooling waters of cooling water collide area ".Spray pressure (N/m2(=
MPa it)) is defined with the ejection pressure of cooling water.Collision time (s) is with " the transport of the collision thickness ÷ steel plates of cooling water
The value that speed " calculates.The energy density of the cooling water calculated using the simple definition and the oxide skin generated in product surface
The relationship of thickness is also similary with Fig. 2, and the energy density of cooling water is bigger, then scale thickness is smaller.That is, energy density E is less than
0.10J/mm2When, the deviation increase of the scale thickness of steel plate sometimes, it is impossible to equably be cooled down, it is impossible to the thick steel of manufacture
The excellent steel plate of plate shape.In contrast, energy density E is 0.10J/mm2More than when, such failure can be avoided.Therefore,
In the present invention, the energy density E of cooling water is set as 0.10J/mm2Above, it is more preferably 0.15J/mm2More than.
Then, the present inventor carries out the fluid velocity v of the cooling water of the injection nozzle injection from descale device 4
It investigates.Its result recognizes that the relationship of fluid velocity v and jet length is as shown in Figure 3.It is right that fluid velocity as the longitudinal axis passes through
The equation of motion for considering buoyancy and air drag is resolved to be obtained.During until cooling water reaches steel plate
Interior, the fluid velocity v ratios of cooling water slow down when spraying.Therefore, jet length is smaller, then fluid velocity v when steel plate collides
It is bigger, it can more obtain big energy density.According to fig. 3, when particularly jet length H is more than 200mm, attenuation increase, therefore,
Jet length H is preferably set to below 200mm.
Moreover, jet length is shorter, then also can for obtaining the injection pressure of defined energy density, injection flow etc.
It is smaller, it can realize the reduction of the pump capacity of descale device 4.In an embodiment of the invention as shown in Figure 1,
It carries out the steel plate 1 after shape correction using first shape apparatus for correcting 5 to move into descale device 4, therefore, it is possible to make
The injection nozzle of descale device 4 is close to the surface of steel plate 1.But, it is contemplated that injection nozzle contact with steel plate 1,
The lower limiting value of jet length is preferably more than 40mm.Therefore, in the present invention, jet length H is preferably more than 40mm and 200mm
Below.
In addition, in descale device 4, the injection pressure of cooling water is preferably set to more than 10MPa, more preferably sets
For more than 15MPa.Thereby, it is possible to be set as the energy density of cooling water in the case where not reducing travelling speed excessively
0.10J/mm2More than, therefore be effective.Injection upper limit of pressure value is not particularly limited.But when carrying high injection pressure,
The energy that the pump of supply high pressure water is consumed is huge, and therefore, injection pressure is preferably below 50MPa.
For giving that the stability during cooling using the steel plate 1 of accelerated cooling device 6 affects, steel plate 1
The oxide skin on surface, the growth of the oxide skin of steel plate 1 can usually be arranged with diffusion rate control, it is known that such as following (2)
Shown in formula.
ξ2=a × exp (- Q/RT) × t ... (2)
Wherein, ξ is scale thickness, a is constant, Q is activation energy, R is constant, T is steel plate temperature before cooling
[K], t are the time.
Accordingly, it is considered to using descale device 4 oxide skin remove after oxide scale growth, various temperature, when
Between the lower simulated experiment for carrying out oxide scale growth, experimentally export the constant of above-mentioned (2) formula, and further to scale thickness
It is had made intensive studies with cooling stability.Its result has obtained following opinion：For cooling, scale thickness for 15 μm with
Stablize when lower, it is more stable when scale thickness is less than 10 μm, it is highly stable for less than 5 μm in scale thickness.
In the case where scale thickness is less than 15 μm, based on above-mentioned (2) formula, following formula (3) can be exported.That is, from
It is arrived after being removed using the oxide skin of the steel plate 1 of descale device 4 and starts steel plate 1 using accelerated cooling device 6
In the case that the time t [s] of cooling meets following (3) formulas, stablized using the cooling of accelerated cooling device 6.
t≤5×10-9×exp(25000/T)…(3)
Wherein, T is steel plate temperature [K] before cooling.
In addition, in the case where scale thickness is less than 10 μm, based on above-mentioned (2) formula, following formula (4) can be exported.
That is, to thick steel using accelerated cooling device 6 after being removed using the oxide skin of the steel plate 1 of descale device 4
In the case that the time t [s] of the cooling of plate 1 meets following (4) formulas, the cooling using accelerated cooling device 6 is more stable.
t≤2.2×10-9×exp(25000/T)…(4)
And then in the case where scale thickness is less than 5 μm, based on above-mentioned (2) formula, following formula (5) can be exported.
That is, to thick steel using accelerated cooling device 6 after being removed using the oxide skin of the steel plate 1 of descale device 4
In the case that the time t [s] of the cooling of plate 1 meets following (5) formulas, the cooling using accelerated cooling device 6 is highly stable.
t≤5.6×10-10×exp(25000/T)…(5)
On the other hand, from the outlet side of descale device 4 to the distance L of the entrance side of accelerated cooling device 6 with opposite
(terminate to the process of accelerated cooling device 6 to open from the process of descale device 4 in the travelling speed V and time t of steel plate 1
The time of beginning) mode that meets following (6) formulas set.
L≤V×t…(6)
Wherein, L is from descale device 4 to the distance (m) of accelerated cooling device 6, the travelling speed that V is steel plate 1
(m/s), t is the time (s)
Then, by above-mentioned (6) formula and above-mentioned (3) formula, following (7) formulas can be exported.In the present invention, more preferably meet
(7) formula.
L≤V×5×10-9×exp(25000/T)…(7)
In addition, by above-mentioned (6) formula and above-mentioned (4) formula, following (8) formulas can be exported.In the present invention, it is further preferably full
Foot (8) formula.
L≤V×2.2×10-9×exp(25000/T)…(8)
And then by above-mentioned (6) formula and above-mentioned (5) formula, following (9) formulas can be exported.In the present invention, it is preferred to meet (9)
Formula.
L≤V×5.6×10-10×exp(25000/T)…(9)
According to above-mentioned (7)~(9) formula, such as in the temperature for making to carry out steel plate 1 before cooling using accelerated cooling device 6
For 820 DEG C, the travelling speed of steel plate 1 is made to be 0.28~2.50m/s when, from descale device 4 to accelerated cooling device 6
Cooling is stablized when distance L is more than 12m and below 107m, and distance L is more stable to be cooled down when more than 5m and below 47m, and distance L is
More than 1.3m and when below 12m, cool down highly stable.
When making the distance L from descale device 4 to accelerated cooling device 6 as a result, for below 12m, even if in steel plate 1
Travelling speed V slow (such as V=0.28m/s) when cooling also stablize, conversely, fast (such as the V=of the travelling speed V in steel plate 1
It is cooled down when 2.50m/s) highly stable therefore preferred.It should be noted that it is more preferably cooled down from descale device 4 to acceleration
The distance L of device 6 is below 5m.
And then, it is however generally that, if it is considered that the most travelling speed V for needing to control the steel plate 1 of cooling is 0.5m/
More than s then further preferably cools down highly stable condition under travelling speed V, i.e. distance L is set as below 2.5m.
It should be noted that here, it is 820 to the temperature for making to carry out steel plate 1 before cooling using accelerated cooling device 6
DEG C situation be illustrated.For make using accelerated cooling device 6 carry out the temperature of steel plate 1 before cooling for 820 DEG C with
Outer situation is also similary, and the distance L from descale device 4 to accelerated cooling device 6 is made to be preferably below 12m, is more preferable
It is below 5m, further preferably 2.5m hereinafter, thus, it is possible to steadily be cooled down.This is because utilizing acceleration cooling
In the case that device 6 carries out the temperature of steel plate 1 before cooling less than 820 DEG C, above-mentioned (7) formula, above-mentioned (8) formula, above-mentioned (9) formula
The value on the right increase respectively compared with T=820 DEG C of situation, therefore, suitably set if it is the situation for T=820 DEG C
The distance L slave descale device 4 to accelerated cooling device 6, then will necessarily meet above-mentioned (7) formula, above-mentioned (8) formula, above-mentioned
(9) formula.Conversely, in the case where the temperature that steel plate 1 before cooling is carried out using accelerated cooling device 6 is higher than 820 DEG C, pass through
Suitably the travelling speed V of steel plate 1 is adjusted relatively low, remain able to meet above-mentioned (7) formula, above-mentioned (8) formula, above-mentioned (9)
Formula.
Then, as shown in figure 4, the accelerated cooling device 6 of the present invention is preferably provided with supplying cooling to the upper surface of steel plate 1
The upper header 11 of water, the rodlike cooling water of injection to dangle from the upper header 11 cooling water injection nozzle 13 and be set to steel plate
Partition 15 between 1 and upper header 11, also, it is provided on partition 15 lower end of multiple interpolation cooling water injection nozzles 13
Admission port 16 and the cooling water drainage of upper surface that is fed to steel plate 1 be put into the discharge outlet 17 of 15 top of partition.
Specifically, upper surface cooling equipment have to steel plate 1 upper surface supply cooling water upper header 11, from this
Upper header 11 dangle cooling water injection nozzle 13 and between upper header 11 and steel plate 1 in entire steel plate width direction
Partitions 15 horizontally disposed and with multiple through holes (admission port 16 and discharge outlet 17).Also, cooling water injection nozzle 13 by
The pipe nozzle 13 for spraying rodlike cooling water is formed, to be inserted in the through hole (admission port for being set to above-mentioned partition 15 in its front end
16) in and the mode more closer to the top than the lower end of partition 15 is configured.It should be noted that for cooling water injection nozzle
For 13, in order to prevent suck upper header 11 in bottom foreign matter and block, preferably so that the upper end is into upper header 11
In the mode injection upper header 11 that portion protrudes.
Here, the rodlike cooling water in the present invention refer to the nozzle ejiction opening from round (also including oval, polygon) with
The cooling water of state injection after being pressurizeed to a certain degree, and be that the jet velocity of the cooling water sprayed from nozzle ejiction opening is
More than 6m/s, preferably more than 8m/s and the section of flow ejected from nozzle ejiction opening, which generally remain circular, to be had continuously
Property and straight trip property flow cooling water.That is, with sprayed from pipe laminar flow nozzle free-falling stream, with as spraying liquid
The flow of drop-wise state injection is different.
Side in through hole and more closer to the top than the lower end of partition 15 is inserted within the front end of cooling water injection nozzle 13
Formula setting is because even if in the case of front end upward the steel plate entrance of warpage, it is cold to prevent that partition 15 can also be used
But water injection nozzle 13 generates damage.Cooling water injection nozzle 13 can chronically be cooled down in the state of good as a result,
Therefore, without carrying out equipment repairing etc., the generation of the temperature unevenness of steel plate can be prevented.
In addition, be inserted in through hole in the front end of pipe nozzle 13, therefore, as shown in figure 11, will not with from partition 15
The width direction flowing of the discharge water 19 of the dotted arrow of upper surface flowing interferes.Therefore, from cooling water injection nozzle 13
The cooling water ejected independently can comparably reach steel plate upper surface with width position, can be in the direction of the width
Uniformly cooled down.
If showing an example of partition 15, as shown in fig. 6, on partition 15 be 80mm in steel plate width direction, transport
Offer the through hole of multiple a diameter of 10mm on direction with the trellis of chessboard for the spacing of 80mm.Also, in admission port 16
Inserted with the cooling water injection nozzle 13 that outer diameter is 8mm, internal diameter 3mm, length are 140mm.Cooling water injection nozzle 13 is with friendship
The arrangement of wrong clathrate, cooling water injection nozzle 13 not by through hole be cooling water discharge outlet 17.In this way, the present invention's
The multiple through holes set on the partition 15 of accelerated cooling device are made of the admission port 16 and discharge outlet 17 of approximately same number,
Respectively share effect, function.
At this point, the total sectional area of discharge outlet 17 is sufficiently above the total of the inside of the pipe nozzle 13 of cooling water injection nozzle 13
Sectional area, it is ensured that about 11 times of the total sectional area of the inside of pipe nozzle 13, as shown in figure 4, supplying to steel plate upper surface
Cooling water riddle between steel plate surface and partition 15, from discharge outlet 17 by being conducted to the top of partition 15, and by
Quick discharge.Fig. 7 is before being illustrated to the flowing of the cooling draining near the steel plate width direction end above partition
View.The drainage direction of discharge outlet 17 is the upward direction opposite with cooling water injection direction, is pierced by the top of partition 15
Draining is cooled down to change direction on the outside of steel plate width direction, the drainage flow path between upper header 11 and partition 15 is flowed through and is arranged
It puts.
On the other hand, example shown in Fig. 8 is so that discharge outlet 17 tilts in steel plate width direction and makes draining side
To the example being set as towards the mode on the outside of steel plate width direction towards the inclined direction on the outside of width direction.Between as a result,
The steel plate width direction flowing of the discharge water 19 of 15 top of wall becomes smooth, and draining is promoted, therefore preferably.
Here, as shown in figure 9, when discharge outlet and admission port are arranged in same through hole, after cooling water collision steel plate,
It is difficult to be pierced by the top of partition 15, thus to steel plate width direction endwall flow between steel plate 1 and partition 15.This
Sample, the flow of the cooling draining between steel plate 1 and partition 15 is then more closer to the end of plate width direction, therefore,
In plate width direction end, the power that the perforation of spray cooling water 18 is detained moisture film and reaches steel plate is more hindered.
In the case of thin plate, plate width is up to about 2m, therefore its influence is limited.But particularly it is in plate width
In the case of the slab of more than 3m, influence cannot be ignored.Therefore, the cooling of steel plate width direction end dies down, at this time
The Temperature Distribution of steel plate width direction becomes non-uniform Temperature Distribution.
In contrast, accelerated cooling device of the invention has been provided separately admission port 16 and discharge outlet 17 as shown in Figure 10,
The effect of feedwater and draining is shared, therefore so that cooling draining is from the discharge outlet 17 of partition 15 by successfully flowing to partition
15 top.Therefore, draining after cooling is rapidly excluded from steel plate upper surface, therefore, the cooling water energy subsequently supplied
Moisture film is detained in enough easily perforations, can be adequately cooled ability.The Temperature Distribution of steel plate width direction at this time into
For uniform Temperature Distribution, uniform Temperature Distribution in the direction of the width can be obtained.
It may be mentioned that the total sectional area of discharge outlet 17 is 1.5 times or more of the total sectional area of the internal diameter of pipe nozzle 13
When, the discharge of cooling water quickly carries out.For example, the hole bigger than the outer diameter of pipe nozzle 13 is offered on partition 15, makes draining
Mouthful number it is identical with the number of admission port or more than it when can realize said effect.
When the total sectional area of discharge outlet 17 is less than 1.5 times of the total sectional area of the inside of pipe nozzle 13, the stream of discharge outlet
Dynamic resistance increases, and occluded water is difficult to be discharged, and as a result allows to the cooling water inflow that perforation is detained moisture film and reaches steel plate surface
It is greatly decreased, cooling capacity reduces, therefore not preferably.More preferably 4 times or more.On the other hand, discharge outlet is excessive or draining
When the diameter of section of mouth is excessive, the rigidity of partition 15 reduces, and damage is easily generated when steel plate is collided.Therefore, discharge outlet
The ratio between the total sectional area of inside of total sectional area and pipe nozzle 13 preferably 1.5 to 20 range.
In addition, the peripheral surface of the pipe nozzle 13 in the interior admission port 16 for being inserted in partition 15 and the inner peripheral surface of admission port 16
Gap is preferably set to below 3mm.When the gap is big, due to the influence of the adjoint stream of cooling water sprayed from pipe nozzle 13,
The cooling draining discharged to the upper surface of partition 15 is introduced in the gap with the peripheral surface of pipe nozzle 13 of admission port 16,
It is supplied again to steel plate, therefore cooling efficiency is deteriorated.The above situation in order to prevent more preferably makes the outer of pipe nozzle 13
Diameter is roughly the same with the size of admission port 16.But, it is contemplated that operating accuracy, installation error substantially influence small below 3mm
Gap be allowed.More preferably it is set as below 2mm.
In addition, in order to enable cooling water can penetrate through be detained moisture film and reach steel plate, need to make the interior of pipe nozzle 13
Diameter, length, the jet velocity of cooling water, nozzle distance also reach best.
That is, nozzle inside diameter is preferably 3~8mm.During less than 3mm, the water beam sprayed from nozzle attenuates, and the flow of water dies down.It is another
Aspect, when nozzle diameter is more than 8mm, flow velocity is slack-off, and the power that moisture film is detained in perforation weakens.
The length of pipe nozzle 13 is preferably 120~240mm.The length of pipe nozzle 13 described herein refers to from one
Determine the length of the lower end of the nozzle in the inflow entrance to the interior admission port for being inserted in partition of the upper end of nozzle inside degree injection collector.
Than 120mm in short-term, the distance of collector lower surface and partition upper surface becomes too short (for example, collection tube thickness is set to pipe nozzle 13
20mm is set as 20mm, by the upper end of nozzle overhang prominent into collector, sets the insertion that nozzle lower end is inserted into partition
During for 10mm, above-mentioned distance is less than 70mm), therefore, the drainage space of upside reduces from partition, and cooling draining cannot be successfully
It is discharged.When on the other hand, than 240mm long, the pressure loss increase of pipe nozzle 13, the power that moisture film is detained in perforation weakens..
The jet velocity of the cooling water sprayed from nozzle is needed for more than 6m/s, preferably more than 8m/s.It is this is because small
When 6m/s, the power that moisture film is detained in cooling water perforation is extremely weak.When for more than 8m/s, it can be ensured that the cooling capacity of bigger, because
This is preferably.In addition, it can be set from the distance on lower end to the surface of steel plate 1 of cooling water injection nozzle 13 that upper surface cools down
For 30~120mm.During less than 30mm, steel plate 1 and the frequency that partition 15 collides are very big, it is difficult to carry out plant maintenance.It is more than
During 120mm, the power that moisture film is detained in cooling water perforation is extremely weak.
It, can be by so that in Shang Ji in a manner of cooling water not be extended along steel plate length direction in the cooling of steel plate upper surface
The front and rear setting of pipe 11 removes damping roller (water cuts ロ ー Le) 20.Cooling zone consistent length as a result, temperature control become easy.Here,
The flowing of the cooling water of steel plate carriage direction stopped using except damping roller 20, therefore, cooling draining is to steel plate width direction
It flows in outside.But except being easily detained cooling water near damping roller 20.
It is therefore preferable that as shown in figure 5, in the row of pipe nozzle 13 arranged in steel plate width direction, steel plate is transported
The cooling water injection nozzle that the most upstream side in direction arranges is sent to tilt 15~60 degree to the updrift side of steel plate carriage direction, thick steel
The cooling water injection nozzle of the most downstream side row of sheet conveyance direction tilts 15~60 degree to the downstream direction of steel plate carriage direction.
Cooling water can be also being supplied close to the position except damping roller 20 as a result, cooling water, cooling effect will not be detained near except damping roller 20
Rate improves, therefore preferably.
The distance of 11 lower surface of upper header and 15 upper surface of partition by collector lower surface and partition upper surface so as to be surrounded
1.5 times or more of side of the steel plate width direction flow path cross sectional area for the total sectional area of cooling water injection nozzle internal diameter in space
Formula is set, for example, about more than 100mm.The steel plate width direction flow path cross sectional area does not reach in cooling water injection nozzle
At 1.5 times or more of the total sectional area of diameter, cooling row from the discharge outlet 17 being set on partition to 15 upper surface of partition that discharged from
Water cannot be discharged successfully along steel plate width direction.
In the accelerated cooling device of the present invention, the ranging from 1.5m of the water yield density of effect can be most played3/(m2Point
Clock) more than.When water yield density is less than above range, being detained moisture film will not be so thick, even if using rodlike cooling water is made freely to fall
Get off the known technology cooled down to steel plate, and the temperature unevenness of width direction will not be so big sometimes.On the other hand, i.e.,
Make to be higher than 4.0m in water yield density3/(m2Minute) in the case of, the technology using the present invention is also effective, but can exist and set
The problem of practical aspects such as standby cost raising, therefore, therefore 1.5~4.0m3/(m2Minute) most practical water yield density.
It is particularly effective in the case of configuration removes damping roller before and after cooling manifold using the cooling technology of the present invention.
But it can also be applied in the case where not removing damping roller.For example, it can also apply to collector (tool longer in the longitudinal direction
In the case of having about 2m~about 4m), before and after the collector water spray of injection purging and prevent the leak to non-aqueous cold-zone
Cooling equipment.
It should be noted that in the present invention, the cooling device of steel plate lower face side is not particularly limited.Scheming
4th, in the embodiment shown in 5, the cooling next part having with the same pipe nozzle 14 of the cooling device of upper surface side is shown
The example of pipe 12.In the cooling of steel plate lower face side, the cooling water that ejects is fallen naturally after colliding steel plate, because
This, can not also have the partition 15 for discharging cooling draining along steel plate width direction as being cooled down upper surface side.Separately
Outside, the known technology for supplying membranaceous cooling water, misty misting cooling water etc. can also be used.
As described above, the manufacturing equipment of the steel plate of the present invention is by will be from the injection nozzle of descale device 4 to thickness
The energy density E of the surface injection of steel plate 1 is set as 0.10J/mm2More than, it can realize the oxide skin that is generated on steel plate 1
Homogenization, can realize uniform cooling using accelerated cooling device 6.As a result, it is excellent to manufacture steel plate shape
Steel plate 1.
In addition, carrying out the shape correction of steel plate 1 by using first shape apparatus for correcting 5, deoxidation leather jacket can be made
4 injection nozzle is put close to the surface of steel plate 1.
In addition, jet length H (injection nozzle of descale device 4 and the distance on the surface of steel plate 1) is made to be 40mm
Above and during below 200mm, descale ability improves.In addition, for obtaining the injection pressure of defined energy density E, spray
Amount of jet etc. it is smaller can also, therefore, it is possible to realize the reduction of the pump capacity of descale device 4.
In addition, by the way that the distance L from descale device 4 to accelerated cooling device 6 is made to meet L≤V × 5 × 10-9×exp
(25000/T) can make to stablize using the cooling of the steel plate 1 of accelerated cooling device 6.
In addition, for the accelerated cooling device 6 of the present invention, as shown in figure 4, being passed through from top cooling water injection nozzle 13
The upper surface of steel plate 1 is cooled down and is become from the cooling water that admission port 16 supplies the draining of high temperature, in no insert
The discharge outlet 17 of portion's cooling water injection nozzle 13 is as width direction stream of the drainage flow path from the top of partition 15 along steel plate 1
Dynamic, draining after cooling is rapidly excluded from steel plate 1, therefore, from top cooling water injection nozzle 13 via admission port 16
The cooling water of flowing is sequentially contacted with steel plate 1, and thereby, it is possible to obtain fully and in the direction of the width uniform cooling capacity.
It should be noted that the result that the present inventor is studied is it is found that without the deoxidation as the present invention
The temperature unevenness that the width direction for the steel plate for accelerating cooling has been carried out in the case of skin reaches about 40 DEG C.On the other hand it is found that
Using the present invention descale device 4 and make cooling water energy density be 0.10J/mm2Above come after carrying out descale
The temperature unevenness for having carried out the width direction for the steel plate for accelerating cooling is reduced to about 10 DEG C.It is further known that utilize deoxidation
After leather jacket puts 4 implementation descales, the width for the steel plate for accelerating cooling is implemented using accelerated cooling device 6 shown in Fig. 4
The temperature unevenness in direction is reduced to about 4 DEG C.In addition, the temperature about steel plate is uneven, it is cold to accelerating using sweep type thermometer
But the surface of steel plate Temperature Distribution after is measured, and the temperature that width direction is calculated by its measurement result is uneven.
In addition, such as the present invention in this way, the deformation generated in rolling is corrected using first shape apparatus for correcting 5, profit
The descale of steel plate 1 is carried out with descale device 4, stablizes the controlling of cooling, therefore, to be rectified using the second shape
1 script of steel plate that equipment 7 is corrected is high with regard to flatness, and the temperature of steel plate 1 is also uniform.Therefore, the second shape correction device 7
Correction reaction force without too high.In addition, the distance of 6 and second shape correction device 7 of accelerated cooling device can be than rolling
The maximum length of steel plate 1 manufactured in manufacturing line is long.Also utilize the second shape correction device 7 in most cases as a result,
Implement reversely correction etc., therefore can expect following effect：Prevent that the steel plate reversely transported 1 from beating in transport roller and with adding
The failures such as the fast collision of cooling device 6；Make the small temperature deviation homogenization generated in the cooling in accelerated cooling device 6, from
And avoid the generation of the warpage caused by temperature deviation after correction.
Embodiment 1
Make the plate thickness 30mm rolled out using roll mill 3, the steel plate 1 of width 3500mm from first shape apparatus for correcting 5
Pass through with descale device 4, the control cooling then carried out from 820 DEG C to 420 DEG C.Here, for the stable condition of cooling
For, when being calculated according to above-mentioned (3), (4), (5) formula, terminate from the oxide skin removing of the steel plate 1 using descale device 4
Arrive afterwards using accelerated cooling device 6 start steel plate 1 cooling time t be preferably below 42s, more preferably below 19s, into
One step is preferably below 5s.
In descale device 4, the injection pressure of nozzle is set as 17.7MPa, the injection flow of each nozzle is set
It is 50L/ minutes (=8.3 × 10-4m3/ s), jet length (injection nozzle of descale device 4 and the surface of steel plate 1
Distance) be set as 130mm, nozzle spray angle be set as 32 °, the nozzle angle of attack be set as 15 ° so that the injection of adjacent nozzle
Region is arranged in 1 row in the direction of the width in a manner of being overlapped to a certain degree, and spray injection thickness is 3mm, spray injection width
For 77mm.Here, the energy density of cooling water is the value to define with above-mentioned water yield density × injection pressure × collision time.
Collision time (s) is that the time of the deoxidation severe edema due to hypofunction of the spleen is sprayed to steel plate surface, by using spray injection thickness divided by travelling speed
To be obtained.
Accelerated cooling device 6 is the equipment for being provided with following flow path：Make supply cold to steel plate upper surface as shown in Figure 4
But water flows to the top of partition, can further be discharged as shown in Figure 7 from steel plate width direction side.With chessboard on partition
Trellis offer the hole of a diameter of 12mm, as shown in fig. 6, interpolation top cools down in the admission port for the clathrate arrangement that interlocks
Remaining hole is used as discharge outlet by water injection nozzle.The distance of upper header lower surface and partition upper surface is 100mm.
The top cooling water injection nozzle of accelerated cooling device 6 is set as internal diameter 5mm, outer diameter 9mm, length 170mm, makes it
Upper end is prominent into collector.In addition, the jet velocity for making rodlike cooling water is 8.9m/s.The injector spacing of steel plate width direction
For 50mm, 10 row nozzles are arranged in the region of distance 1m in the longitudinal direction between roller-way.The water yield density of upper surface is
2.1m3/(m2Minute).The nozzle lower end of upper surface cooling is to become the centre position of the upper and lower surface of the partition of plate thickness 25mm
Mode be configured, to steel plate surface distance be 80mm.
It should be noted that for lower surface cool down equipment, using it is as shown in Figure 4 in addition to not having partition, with it is upper
Surface cooling equipment similarly cools down equipment, and it is 1.5 times of upper surface to make the jet velocity of rodlike cooling water and water yield density.
Then, as shown in table 1, the transport for making the distance L, steel plate from descale device 4 to accelerated cooling device 6 is fast
It spends V and carries out various changes from descale device 4 to the time t of accelerated cooling device 6.
For steel plate shape, evaluated with adding restitution factor (%).Specifically, the warpage in steel plate whole length
And/or the warpage on the entire width of steel plate within a reference value specified in product standard corresponding with its steel plate when be judged as closing
Lattice, more than a reference value when, are judged as that material is implemented in additional correction, additional restitution factor with (radical of material is implemented in additional correction)/
The mode of (total radical of subject material) × 100 calculates.
For the example of the present invention 1~5 of table 1, energy density is 0.10J/mm2More than, therefore, shape defect is led
The addition restitution factor of cause is low, has obtained good result.It is thought that when being cooled down using accelerated cooling device 6, almost
It is equably cooled there is no the deviation of the surface temperature of width position, it is considered to be drawn by the Temperature Distribution of steel plate
The flatness risen is excellent, as a result, the addition restitution factor caused by shape defect is low.In addition, example 1~5 of the present invention removes
Oxide skin, surface texture are also good.It should be noted that in the evaluation of surface texture, the steel plate being cooled to room temperature is used
The image on surface determines whether oxide skin according to using the image procossing of oxide skin residual part and the hue difference of stripping portion, and
It is evaluated.
Particularly, for make from descale device 4 to the distance of accelerated cooling device 6 be 5m example of the present invention 1~3 and
Speech, to thick steel using accelerated cooling device 6 after being removed using the oxide skin of the steel plate 1 of descale device 4
The time t of the cooling of plate 1 is unrelated with the travelling speed V of steel plate, the item more stable for the cooling using accelerated cooling device 6
Part, i.e. below 19s.Therefore, additional restitution factor is 5% hereinafter, being good.
In addition, in example 5 of the present invention, even if not needing to high impact pressure as patent document 1, patent document 2
(1.0MPa) by making energy density within the scope of the present invention, has also obtained good result.
On the other hand, for it is no implement using descale device 4 oxide skin removing in the case of carried out profit
For comparative example 1 with the cooling of accelerated cooling device 6, it is considered to be the flatness as caused by the Temperature Distribution of steel plate becomes
Difference, additional restitution factor are 40%.
In addition, it is hydraulic pressure 9MPa for making the setting condition based on descale device 4, the injection flow of each nozzle
It is 25L/ minutes (=4.2 × 10-4m3/ s), other conditions are identical with example 2 of the present invention and energy density is made to be 0.08J/mm2Ratio
For example 2, oxide skin is partially stripped, and the Temperature Distribution of steel plate width direction is deteriorated as a result, along with this, thick steel
The flatness of plate is also deteriorated, therefore additional restitution factor is 70%.
In addition, comparative example 3 is despite in the range of the high impact pressure as patent document 1, patent document 2, but
Out of the range of the present invention, therefore, oxide skin is partially stripped energy density, as a result, the temperature of steel plate width direction point
Cloth is deteriorated, along with this, the flatness of steel plate is also deteriorated, therefore additional restitution factor is 65%.
Symbol description
1 steel plate
2 heating furnaces
3 roll mills
4 descale devices
5 first shape apparatus for correcting
6 accelerated cooling devices
7 second shape correction devices
11 upper headers
12 lower collector pipes
Cooling water injection nozzle (pipe nozzle) on 13
14 times cooling water injection nozzles (pipe nozzle)
15 partitions
16 admission ports
17 discharge outlet
18 spray cooling water
19 discharge water
20 remove damping roller
21 remove damping roller
Claims (8)
1. a kind of manufacturing equipment of steel plate, which is characterized in that by hot-rolling mill, shape correction device, descale device and add
Fast cooling device is configured with this sequentially from carriage direction upstream side,
It is 0.10J/mm to make energy density E possessed by the descale device to the cooling water of the surface injection of steel plate2With
On, and the impact pressure of the cooling water is made to be less than 1.0MPa,
The accelerated cooling device has the collector of the upper surface supply cooling water to the steel plate, the spray dangled from the collector
Penetrate the cooling water injection nozzle of rodlike cooling water and positioned at the front and rear except damping roller of the collector,
The cooling water injection nozzle of the most upstream side row of the carriage direction of the steel plate is to the upstream of the carriage direction
Direction tilts 15~60 degree, and the cooling water injection nozzle that the most downstream side of the carriage direction arranges is to steel plate carriage direction
Downstream direction tilt 15~60 degree.
2. the manufacturing equipment of steel plate as described in claim 1, which is characterized in that will be from the descale device to described
When the travelling speed of accelerated cooling device is set as V [m/s], steel plate temperature before cooling is set as T [K], from the deoxidation
The distance L [m] that leather jacket puts the accelerated cooling device meets formula L≤V × 5 × 10-9×exp(25000/T)。
3. the manufacturing equipment of steel plate as claimed in claim 2, which is characterized in that so that from the descale device to institute
Each device is configured in the mode that the distance L for stating accelerated cooling device is below 12m.
4. the manufacturing equipment of steel plate as claimed any one in claims 1 to 3, which is characterized in that make from the deoxidation
The jet length H on the injection nozzle that leather jacket is put to the surface of the steel plate is more than 40mm and below 200mm.
5. the manufacturing equipment of steel plate as claimed any one in claims 1 to 3, which is characterized in that described to accelerate cooling dress
The partition for having and being set between the steel plate and the collector is put, also, multiple interpolation institutes are provided on the partition
The admission port and the cooling water drainage of upper surface for being fed to the steel plate for stating the lower end of cooling water injection nozzle are put into institute
State the discharge outlet above partition.
6. the manufacturing equipment of steel plate as claimed in claim 4, which is characterized in that the accelerated cooling device, which has, to be set to
Partition between the steel plate and the collector, also, be provided on the partition and cool down water injection described in multiple interpolations
The admission port of the lower end of nozzle and the cooling water drainage of upper surface for being fed to the steel plate are put into above the partition
Discharge outlet.
7. a kind of manufacturing method of the steel plate of manufacturing equipment using steel plate described in claim 1, according to Hot-roller
Sequence, heat straightening process and the sequence manufacture steel plate for accelerating cooling process, which is characterized in that in the heat straightening process and cooling
It is 0.10J/mm to have between process to the surface injection energy density E of steel plate2Above, impact pressure is cold less than 1.0MPa
But the descale process of water.
8. the manufacturing method of steel plate as claimed in claim 7, which is characterized in that terminate from the descale process to institute
It states the time t [s] that cooling process is accelerated to start and meets formula t≤5 × 10-9× exp (25000/T), wherein, T is before cooling
Steel plate temperature (K).
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| JP2013-065342 | 2013-03-27 | ||
| JP2013065342 | 2013-03-27 | ||
| PCT/JP2014/001615 WO2014156086A1 (en) | 2013-03-27 | 2014-03-20 | Thick steel plate manufacturing device and manufacturing method |
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| CN105102142B true CN105102142B (en) | 2018-06-12 |
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| EP (1) | EP2979770B1 (en) |
| JP (1) | JP5962849B2 (en) |
| KR (1) | KR101742607B1 (en) |
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| JP6377550B2 (en) * | 2015-03-06 | 2018-08-22 | 株式会社神戸製鋼所 | Thick steel plate cooling method and thick steel plate cooling device |
| JP2016182622A (en) * | 2015-03-26 | 2016-10-20 | Ｊｆｅスチール株式会社 | Method and apparatus for removing excess scale on plug for piercing seamless steel tube material and method of using the plug |
| US11033942B2 (en) * | 2016-08-09 | 2021-06-15 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Rolling mill exit side temperature control system |
| RU2741033C1 (en) * | 2017-09-28 | 2021-01-22 | ДжФЕ СТИЛ КОРПОРЕЙШН | Production plant for production of steel sheet and method of production of steel sheet |
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| JPH0238283B2 (en) * | 1983-02-09 | 1990-08-29 | Mitsubishi Heavy Ind Ltd | KOHANREIKYAKUSOCHI |
| JPH0957327A (en) | 1995-08-22 | 1997-03-04 | Sumitomo Metal Ind Ltd | Scale removal method of steel plate |
| JPH10113713A (en) * | 1996-10-09 | 1998-05-06 | Kobe Steel Ltd | Production of steel plate of controlled cooling |
| JP2000015323A (en) * | 1998-06-30 | 2000-01-18 | Sumitomo Metal Ind Ltd | Production of hot-rolled steel plate having good surface characteristic |
| JP3872609B2 (en) * | 1999-03-10 | 2007-01-24 | 新日本製鐵株式会社 | Hot rolling method for high Si steel |
| JP3994582B2 (en) * | 1999-06-29 | 2007-10-24 | 住友金属工業株式会社 | Steel sheet descaling method |
| JP3796133B2 (en) | 2000-04-18 | 2006-07-12 | 新日本製鐵株式会社 | Thick steel plate cooling method and apparatus |
| KR100496607B1 (en) * | 2000-12-27 | 2005-06-22 | 주식회사 포스코 | Method And Device For Manufacturing A Hot Rolled Steel Strip |
| JP2003181522A (en) * | 2001-12-14 | 2003-07-02 | Nippon Steel Corp | Method and device for manufacturing steel plate having excellent surface property |
| JP5614040B2 (en) * | 2009-03-25 | 2014-10-29 | Ｊｆｅスチール株式会社 | Manufacturing equipment and manufacturing method for thick steel plate |
| CN202061902U (en) * | 2011-01-22 | 2011-12-07 | 马鞍山钢铁股份有限公司 | Removing apparatus for oxidized iron sheet of hot rolled steel plate in cold rolling |
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| CN105102142A (en) | 2015-11-25 |
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| EP2979770A1 (en) | 2016-02-03 |
| JPWO2014156086A1 (en) | 2017-02-16 |
| WO2014156086A1 (en) | 2014-10-02 |
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| KR101742607B1 (en) | 2017-06-01 |
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