CN106794500A - The manufacturing equipment and manufacture method of steel plate - Google Patents
The manufacturing equipment and manufacture method of steel plate Download PDFInfo
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- CN106794500A CN106794500A CN201580045928.4A CN201580045928A CN106794500A CN 106794500 A CN106794500 A CN 106794500A CN 201580045928 A CN201580045928 A CN 201580045928A CN 106794500 A CN106794500 A CN 106794500A
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- steel plate
- cooling
- scaling
- descaling device
- injection nozzle
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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
- B21B45/04—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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
-
- 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
- B21B45/0218—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
- 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
- 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
- B21B45/06—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 of strip material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
It is an object of the present invention to the oxide skin produced on steel plate surface is become uniform by de-scaling operation, so as to provide uniformly be cooled down in refrigerating work procedure, the manufacturing equipment and manufacture method of steel plate shape and the excellent steel plate of mechanical property.The manufacturing equipment of steel plate, it is characterized in that, hot-rolling mill, shape straightener, descaling device and accelerated cooling device are configured successively from conveyance direction upstream side, the injection nozzle of the descaling device is arranged relative to the length direction configuration 2 of steel plate, and the energy density E entrained by the de-scaling water of the surface injection from the injection nozzle of described 2 row to steel plate is set as adding up to 0.08J/mm2More than.
Description
Technical field
Manufacturing equipment and manufacture the present invention relates to carry out the steel plate of the hot rolling, shape aligning and acceleration cooling of steel plate
Method.
Background technology
In recent years, as the manufacturing process of steel plate, the application of cooling is controlled gradually to expand.However, generally, hot rolling thickness steel
The shape of plate, surface characteristic are not necessarily uniform.Therefore, the occurrence temperature in steel plate is easy in cooling uneven, after the cooling period
Steel plate in be deformed, residual stress, material are uneven etc., so as to cause, quality is bad, operational problem.
Therefore, in patent document 1, disclose to finish rolling close in before final passage and afterwards at least one
De-scaling (descaling) is carried out, thermal straightening is then carried out, de-scaling is then carried out, the method for carrying out forcing cooling.In addition, special
In sharp document 2, disclose after finish rolling, thermal straightening is carried out, the method for carrying out being controlled cooling after de-scaling.In addition, in patent
In document 3, disclosed before it will control cooling, the method for carrying out de-scaling while the surge of cooling water is controlled.
Prior art literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 9-57327 publications
Patent document 2：Japanese Patent No. 3796133
Patent document 3：Japanese Unexamined Patent Publication 2010-247228 publications
The content of the invention
Invent problem to be solved
But, when actually steel plate is manufactured by the method for above-mentioned patent document 1,2, there are following problem points：
During de-scaling, there is oxide skin (scale) and be not completely exfoliated, but oxide skin is partially stripped by de-scaling state,
There is oxide skin uneven, can not uniformly be cooled down when cooling is controlled.In addition, in order in the method for patent document 3 not
There is oxide skin uneven, it is necessary to surge higher.Accordingly, there exist following problems point：There is oxygen under low surge
Change skin uneven, as a result, can not uniformly be cooled down when cooling is controlled.
Especially, in recent years, the level of the uniform in material required by steel plate becomes more strict, by as described above
Cooling velocity during the control cooling that oxide skin is uneven and produces it is uneven, particularly equal to the material of steel plate width
The harmful effect that even property is produced becomes to be ignored again.
Therefore, the present invention is conceived to an open question in above-mentioned conventional example and makes, it is intended that carrying
For the manufacturing equipment and manufacture method of following steel plate：By making the oxide skin produced on steel plate surface in de-scaling operation
Become uniform, so as to uniformly be cooled down in refrigerating work procedure, steel plate shape and mechanical property are excellent.
The means used to solve the problem
Present inventor concentrates on studies to the power that oxide skin stripping occurs due to de-scaling water, as a result finds,
When de-scaling is carried out after hot shape aligning, if the descaling device of the 2 row above is configured relative to the length direction of steel plate
Injection nozzle, and the energy density of the de-scaling water sprayed to steel plate from the injection nozzle of the 2 row above adds up to 0.08J/
mm2More than, then the scale thickness that the surface after product produces becomes uniform.As a result, when by accelerated cooling device,
Can equably be cooled down in the case of the surface temperature on the width position of steel plate almost no deviation, so that
As the steel plate that steel plate shape is excellent.
Idea of the invention is as described below.
[1] a kind of manufacturing equipment of steel plate, it is characterised in that configure hot-rolling mill, shape successively from conveyance direction upstream side
Shape straightener, descaling device and accelerated cooling device, the length side of the injection nozzle relative to steel plate of the descaling device
Arranged to configuration 2, and the energy density E entrained by the de-scaling water that will be sprayed to the surface of steel plate from the injection nozzle of described 2 row
It is set as adding up to 0.08J/mm2More than.
[2] a kind of manufacturing equipment of steel plate, it is characterised in that configure hot-rolling mill, shape successively from conveyance direction upstream side
Shape straightener, descaling device and accelerated cooling device, the length side of the injection nozzle relative to steel plate of the descaling device
More than the row of configuration 2, and the energy entrained by the de-scaling water that the surface from the injection nozzle of the 2 row above to steel plate is sprayed
Metric density E is set as adding up to 0.08J/mm2More than.
[3] manufacturing equipment of the steel plate as described in [1] or [2], it is characterised in that when will be from the descaling device to institute
The conveyance speed for stating accelerated cooling device is set to V [m/s], when the steel plate temperature before cooling is set into T [K], from the de-scaling
Device to the accelerated cooling device meets L≤V × 5 × 10 apart from L [m]-9The formula of × exp (25000/T).
[4] manufacturing equipment of the steel plate as described in [3], it is characterised in that cold to the acceleration from the descaling device
But device apart from L be below 12m.
[5] manufacturing equipment of the steel plate as any one of [1] to [4], it is characterised in that will be filled from the de-scaling
The injection nozzle put is set to more than 40mm and below 200mm to the surface of the steel plate apart from H.
[6] manufacturing equipment of the steel plate as any one of [1] to [5], it is characterised in that the acceleration cooling dress
Put with the seat that catchments (header) that cooling water is supplied to the upper surface of the steel plate, from the spray wands of the seat pendency that catchments
The cooling water injection nozzle of shape cooling water, the dividing plate set between the steel plate and the seat that catchments, and the dividing plate
On be provided with multiple admission ports and discharge outlet, the admission port is the bottom for internally inserting the cooling water injection nozzle
Admission port, the discharge outlet is the draining of the cooling water that will be supplied to the upper surface of the steel plate to draining on the dividing plate
Mouthful.
[7] a kind of manufacture method of steel plate, it is characterised in that sequentially carrying out hot-rolled process, thermal straightening operation and adding
Fast refrigerating work procedure in the thermal straightening operation and between accelerating refrigerating work procedure so that in the method for manufacturing steel plate, have de-scaling work
Sequence, the de-scaling operation is to add up to 0.08J/mm with energy density E2Mode above carries out 2 times and removes to the surface of steel plate
The de-scaling operation of squama.
[8] a kind of manufacture method of steel plate, it is characterised in that sequentially carrying out hot-rolled process, thermal straightening operation and adding
Fast refrigerating work procedure in the thermal straightening operation and between accelerating refrigerating work procedure so that in the method for manufacturing steel plate, have de-scaling work
Sequence, the de-scaling operation is to add up to 0.08J/mm with energy density E2More than mode the surface of steel plate is carried out 2 times with
The de-scaling operation of upper de-scaling.
[9] manufacture method of the steel plate according to [7] or [8], it is characterised in that be completed to from the de-scaling operation
The time t [s] for accelerating refrigerating work procedure to start meets t≤5 × 10-9The formula of × exp (25000/T), wherein, T：Before cooling
Steel plate temperature (K).
Invention effect
According to the present invention, in de-scaling operation, become uniform by the oxide skin for producing steel plate surface, so as to cold
But can uniformly be cooled down in operation, steel plate shape and the excellent steel plate of mechanical property can be manufactured.
Brief description of the drawings
[Fig. 1] Fig. 1 is the skeleton diagram of the manufacturing equipment of the steel plate for showing an embodiment of the invention.
[Fig. 2] Fig. 2 is the figure of the Temperature Distribution on the steel plate width for illustrate conventional example.
[Fig. 3] Fig. 3 is the energy density and the product surface in steel plate for showing in descaling device, injection de-scaling water
The curve map of the relation between the scale thickness of generation.
[Fig. 4] Fig. 4 is to show relation in descaling device, between the jet length of injection nozzle and fluid velocity
Figure.
[Fig. 5] Fig. 5 is the figure for representing the surface temperature distribution on steel plate width position of the invention.
[Fig. 6] Fig. 6 is the schematic diagram of the configuration relation of the injection nozzle for showing descaling device, and (a) is expression injection nozzle
Position relationship schematic diagram, (b) be show spray pattern schematic diagram.
The side view of the accelerated cooling device that [Fig. 7] Fig. 7 is related to for an embodiment of the invention.
The side view of other accelerated cooling devices that [Fig. 8] Fig. 8 is related to for an embodiment of the invention.
The nozzle of the dividing plate that [Fig. 9] Fig. 9 implementation method to illustrate the invention is related to configures the figure of example.
[Figure 10] Figure 10 is the figure of the flowing for illustrating the cooling draining on dividing plate.
[Figure 11] Figure 11 is the figure of other flowings for illustrating the cooling draining on dividing plate.
[Figure 12] Figure 12 is the figure of the Temperature Distribution on the steel plate width for illustrate conventional example.
[Figure 13] Figure 13 is the figure of the flowing for illustrating the cooling water in accelerated cooling device.
[Figure 14] Figure 14 is to illustrate the figure with the cooling draining non-interference on the dividing plate in accelerated cooling device.
Specific embodiment
Hereinafter, referring to the drawings, illustrate for implementing mode of the invention.
Fig. 1 is the skeleton diagram of the manufacturing equipment of the steel plate for showing an embodiment of the invention.In Fig. 1, arrow
It is the conveyance direction of steel plate.From the conveyance direction upstream side of steel plate, heating furnace 1, descaling device 2 are configured with successively, are rolled
Machine 3, shape straightener 4, descaling device 6, descaling device 7, accelerated cooling device 5.In Fig. 1, will be used as rolling with heating furnace 1
After the slab reheating (not shown) of raw material processed, due to removing once oxidation skin in descaling device 2, therefore slab is removed
Squama.Then, slab is subjected to roughing and finish rolling by milling train 3, so as to be rolled into the steel plate (not shown) of regulation thickness of slab.Figure
The milling train 3 for showing only is made up of 1 machine.It should be noted that milling train 3 can be also made up of roughing mill and finishing mill.Steel plate exists
After shape straightener 4 is aligned, in descaling device 6 and descaling device 7, enter to be about to the de-scaling that oxide skin is removed completely.
Then, in accelerated cooling device 5, the control for carried out using water-cooled or air cooling is cooled down.Here, by shape straightener
It is preferred for the steel plate shape after cooling to carry out accelerating cooling after the shape of 4 adjustment steel plates.Shape straightener 4 is
The device aligned to the deformation produced in hot rolling medium plate.Shown in Fig. 1 by rectifying with staggered arranging up and down
Straight roller and the shape straightener of roll leveller mode that clamps steel plate.As shape straightener, not limited to this,
The shape straightener of skin-pass mode or pressuring method can be used.In addition, be made up of roughing mill and finishing mill in milling train 3
In the case of, it is also possible to finishing mill carries out skin-pass aligning.
In accelerated cooling device 5, by the cooling water sprayed from upper surface cooling device and lower surface cooling device, so that
Steel plate is cooled to set point of temperature.Afterwards, as needed, further downstream by setting under (online) or line on line
(offline) shape straightener (not shown) aligns the shape of steel plate.Above-mentioned shape straightener is to add in utilization
In the cooling procedure that fast cooling device 5 is carried out, the device aligned to the deformation that steel plate is produced.In the present invention, may not be used yet
Use above-mentioned shape straightener.In addition, above-mentioned shape straightener it is also possible to use table in addition to using roll leveller mode
The shape straightener of skin dress rolling mode or pressuring method.
In the present embodiment, between shape straightener 4 and accelerated cooling device 5,2 descaling devices are set, i.e.,
Configuration descaling device 6 and descaling device 7.The de-scaling water that will be sprayed from descaling device 6 and descaling device 7 to the surface of steel plate
What energy density E was set as the injection nozzle of 2 row adds up to 0.08J/mm2More than.Removed by descaling device 6 and descaling device 7
The oxide skin produced on the surface of steel plate, is then cooled down such that it is able to improve by accelerated cooling device 5 to steel plate
The plate profile and mechanical property of steel plate.Shown descaling device is only 2 row in Fig. 1.It should be noted that also can be by 3
The descaling device of the row above is constituted.When descaling device is the 3 row above, the energy of the de-scaling water that will be sprayed to the surface of steel plate
What density E was set as the injection nozzle of constituted row adds up to 0.08J/mm2More than.
For it is above-mentioned the reasons why it is as described below.In rolling equipment in the prior art, when after shape is aligned in de-scaling
When oxide skin removing is carried out in device, sometimes, oxide skin is partially stripped.If it does, because oxide skin is not shelled equably
From, therefore the deviation of 10~50 μm or so of scale thickness can be produced.In this case, accelerated cooling device behind
In, it is difficult to steel plate is equably cooled down.That is, in the rolling equipment of prior art, being distributed when to scale thickness
When generating the steel plate of deviation and accelerate cooling, as shown in Fig. 2 the deviation of surface temperature on width position becomes
Greatly, can not equably cool down.As a result, producing influence to steel plate shape.
Inventors herein have recognized that, according to the difference of de-scaling condition, oxide skin stripping not only can not be fully carried out, on the contrary
Oxide skin can be encouraged uneven.Also, to oxide skin the condition that can fully carry out is peeled off to be concentrated on studies.As a result, visiting
Understand：In the case of carrying out de-scaling after shape aligning, between shape straightener and accelerated cooling device, relative to thick steel
The length direction of plate configures the descaling device of the 2 row above, and by from the injection nozzle of the 2 row above of descaling device to steel plate
What the energy density E that has of de-scaling water of surface injection was set as the injection nozzle of the 2 row above adds up to 0.08J/mm2With
When upper, the scale thickness for regenerating thereafter is equably changed into less than 5 μm.
During de-scaling, scale surface is cooled due to de-scaling water, and thermal stress is thus produced in oxide skin, and by de-scaling
The impulsive force that water brings is acted.As a result, oxide skin is removed by peeling off or destroying.Present inventor is carried out
After concentrating on studies, find after hot shape aligning by carrying out more than 2 times de-scalings, be obtained in that what is produced during more than 2 times de-scalings
The effect of thermal stress.Also, as shown in Figure 3, it is known that compared with the situation for only carrying out 1 time, carrying out 2 times can more efficiently remove
Oxide skin.Additionally, when the energy density E of the de-scaling water sprayed to steel plate from 2 injection nozzles for arranging of descaling device is added up to
0.08J/mm2During the above, product scale thickness reduces, and can become uniform.Injecting times shown in Fig. 3 are 2 times.Need
Bright, present inventor confirms, and is more than 3 times in injecting times, can also obtain same effect.This is because,
By de-scaling, oxide skin is temporarily equably completely exfoliated, and thereafter, oxide skin is thinly equably regenerated.Thus, according to this
Invention, because the scale thickness by the steel plate before accelerated cooling device is equably thinning, therefore cold by accelerating
But during device, almost can equably cool down in the case of no surface temperature deviation on the width position of steel plate,
So as to turn into steel plate shape and the excellent steel plate of mechanical property.
Energy density E (the J/mm of the de-scaling water sprayed to steel plate2), it is the ability for being removed oxide skin by de-scaling
Index, and defined as following (1) formula.
E=Q ρ v2t÷(2dW)…(1)
Wherein, Q：Injection flow [the m of de-scaling water3/s]、d：The spray jet thickness [mm] of flat burner, W：Flat burner
Spray jet width [mm], fluid density ρ [kg/m3], impact steel plate when fluid velocity v [m/s], attack time t [s]
(t=d/1000V, conveyance speed V [m/s]).
The measure of fluid velocity v during due to impact steel plate may not be easy, therefore fixed by (1) formula to scrupulously obtain
The energy density E of justice is, it is necessary to substantial amounts of labour.
Present inventor is further studied, and is as a result found, used as the energy of the de-scaling water sprayed to steel plate
Density E (J/mm2) easy definition, using water yield density × injection pressure × attack time.Here, water yield density
(m3/(mm2Min)) it is the value that is calculated by " the injection flow ÷ de-scaling water slugs area of de-scaling water ".Injection pressure (N/
m2(=Pa)) defined by the discharge pressure of de-scaling water.Serving as reasons attack time (s), " the impact thickness ÷ steel plates of de-scaling water are removed
Send speed " value that is calculated.In the present invention, as de-scaling ability, energy density E does not have the upper limit.It should be noted that working as
The injection nozzle of the 2 row above adds up to 0.80J/mm2During the above, discharge pressure of pump etc. becomes big, not preferably.
The fluid of de-scaling water of the present inventor to being sprayed from the injection nozzle of descaling device 6 and descaling device 7
Speed v is studied.As a result, finding that the relation between fluid velocity v and jet length is as shown in Figure 4.The longitudinal axis is fluid speed
Spend and obtained by being solved to the equation of motion for considering buoyancy and air drag.Until de-scaling water reaches the phase of steel plate
Between, the fluid velocity v of de-scaling water is when injection compared to deceleration.Therefore, jet length is smaller, fluid velocity when steel plate impacts
V is bigger, can more obtain big energy density.As can be seen from Figure 4, because particularly when jet length H is more than 200mm, decay is got over
Greatly, therefore jet length H is preferably set to below 200mm.
Jet length is shorter, also smaller for obtaining injection pressure, the injection flow of energy density that specify etc., therefore energy
Enough making the pumpability of descaling device 6 and descaling device 7 reduces.In an embodiment of the invention as shown in Figure 1, lead to
Cross shape straightener 4 carried out shape aligning steel plate moved in descaling device 6 and descaling device 7, therefore de-scaling fill
Put the injection nozzle surface that is possible to close to steel plate of 6 and descaling device 7.But, it is contemplated that injection nozzle and steel plate
Contact, jet length is preferably more than 40mm.As known from the above, in the present invention, jet length H be preferably more than 40mm and
Below 200mm.
Because the discharge ability of the pump used in common descaling device 6 and descaling device 7 is more than 14.7MPa, because
The injection pressure of this de-scaling water is preferably more than 14.7MPa.Injection upper limit of pressure is not determined especially.If however, improving
Injection pressure, the then energy quantitative change that the pump of supply de-scaling water is consumed is big, therefore injection pressure is preferably below 50MPa.
As described above, according to present embodiment, the energy density E of the de-scaling water that will be sprayed from the injection nozzle of more than 2
It is set as 0.08J/mm2Descaling device 6 above and descaling device 7 remove the oxide skin produced on the surface of steel plate.Its knot
Really, because the deviation of scale thickness distribution disappears, therefore when steel plate is cooled down by accelerated cooling device 5, such as Fig. 5 institutes
Show, can manufacture steel plate almost equably to be cooled down in the way of the deviation without surface temperature on width position
The excellent steel plate of shape, mechanical property.
In descaling device of the invention 6 and descaling device 7, for example, as shown in Fig. 6 (a), relative to the length side of steel plate
To the de-scaling collecting head 6-1 of descaling device 6, and the de-scaling collecting head 7-1 of descaling device 7 is configured in 2 row.Shown in Fig. 6 (a)
De-scaling collecting head is 2 row.It should be noted that de-scaling collecting head also may be configured as more than 3 row.When here, due to more than 3 row,
There is saturation in the effect above, therefore the upper limit is preferably 3 row.De-scaling water on de-scaling collecting head from being provided with multiple injection nozzles
6-2,7-2 spray to steel plate, as the such spray patterns 22 of Fig. 6 (b).
The configuration relation of injection nozzle 6-2,7-2 of descaling device 6 and descaling device 7, in order to prevent the de-scaling water of the 2nd row
Splashing water to the 1st row de-scaling water produce interference, more than 500mm is preferably left in the longitudinal direction.Additionally, width
Spray pattern preferably such as Fig. 6 (b) the 1st row and the 2nd row it is interconnected.In addition, on from 2 injection nozzles 6-2,7-
The energy density of the de-scaling water of 2 injections, after the thermal stress effect of the de-scaling by the 1st row produces cracking in oxide skin,
During by the de-scaling of the 2nd row so as to remove descale with big energy density, descale can be more efficiently removed.Therefore, in order to
Cracking is produced in oxide skin by the thermal stress effect of the de-scaling of the 1st row, the energy density of the de-scaling water of the 1st row is preferably
0.01J/mm2More than, the energy density of the de-scaling water of the 2nd row is preferably than the 1st big 0.04J/mm of row2More than.It is for descaling device
The situation of the 3 row above, is also likewise, it is preferred that making each nozzle rows be spaced more than 500mm and interconnected in the longitudinal direction.Separately
Outward, descaling device be 3 row more than in the case of, based on it is same with the situation that above-mentioned descaling device is 2 row the reasons why, from close to
The energy density preferably 0.01J/mm of the de-scaling water that the injection nozzle of the descaling device of the row before final row is sprayed2With
On, the energy density of the de-scaling water sprayed from the injection nozzle of the descaling device of final row is preferably than the row close to before finally arranging
Big 0.04J/mm2More than.
Further, since be after being aligned to the shape of steel plate by shape straightener 4, therefore de-scaling fill
Put 6 and descaling device 7 injection nozzle be possible to close to carried out shape aligning steel plate surface.As a result, de-scaling energy
Power is improved.
The stability during cooling of the steel plate carried out using accelerated cooling device 5 can be affected.On steel plate
The oxide skin on surface, the growth of the oxide skin of steel plate usually can be determined by spreading control (diffusion control)
It is fixed, and known represented by following (2) formula.
ξ2=a × exp (- Q/RT) × t ... (2)
Wherein, ξ：Scale thickness, a：Constant, Q：Activation energy, R：Constant, T：Steel plate temperature [K] before cooling, t：When
Between.
Accordingly, it is considered to the oxide scale growth after being removed using the oxide skin that descaling device 6 and descaling device 7 are carried out, with each
Planting temperature, time carries out the simulated experiment of oxide scale growth, so as to derive the constant of above-mentioned (2) formula in the way of testing, enters one
Step is concentrated on studies to scale thickness and cooling stability.Result finds, in the condition that scale thickness is less than 15 μm
Lower cooling stabilization, more stablizes under conditions of being less than 10 μm when scale thickness, and scale thickness is under conditions of less than 5 μm
To stabilization long.
When scale thickness is less than 15 μm, based on above-mentioned (2) formula, following formula (3) can be derived.That is, when from utilization
The oxide skin of the steel plate that the descaling device 7 in the downstream among descaling device 6 and descaling device 7 is carried out is removed after terminating, extremely
In the case of starting following (3) formula of time t [s] satisfactions untill the cooling of steel plate by accelerated cooling device 5, using acceleration
The cooling stabilization that cooling device 5 is carried out.
t≤5×10-9×exp(25000/T)…(3)
Wherein, T：Steel plate temperature [K] before cooling.
In addition, when scale thickness is less than 10 μm, based on above-mentioned (2) formula, following formula (4) can be derived.That is, when from
After the removing of the oxide skin of the steel plate carried out using descaling device 7 is terminated, steel plate is started to by accelerated cooling device 5
In the case that time t [s] untill cooling meets following (4) formula, the cooling carried out using accelerated cooling device 5 is more stablized.
t≤2.2×10-9×exp(25000/T)…(4)
Additionally, when scale thickness is less than 5 μm, based on above-mentioned (2) formula, following formula (5) can be derived.That is, when from
The oxide skin of the steel plate carried out using descaling device 7 is removed after terminating, and the cold of steel plate is started to by accelerated cooling device 5
Untill time t [s] meet following (5) formula in the case of, the cooling carried out using accelerated cooling device 5 is highly stable.
t≤5.6×10-10×exp(25000/T)…(5)
On the other hand, from descaling device 7 go out side to accelerated cooling device 5 entrance side apart from L relative to steel plate
Conveyance speed V and time t (terminate to the operation of accelerated cooling device 5 to open from the de-scaling operation that is carried out using descaling device 7
The time of beginning), to meet following (6) formula in the way of set.
L≤V×t…(6)
Wherein, L：From descaling device 7 to the distance (m) of accelerated cooling device 5, V：The conveyance speed (m/s) of steel plate, t：
Time (s).
Also, from above-mentioned (6) formula and above-mentioned (3) formula, following (7) formula can be imported.In the present invention, more preferably meet
(7) formula.
L≤V×5×10-9×exp(25000/T)…(7)
In addition, from above-mentioned (6) formula and above-mentioned (4) formula, following (8) formula can be derived.In the present invention, it is further preferably full
Foot (8) formula.
L≤V×2.2×10-9×exp(25000/T)…(8)
Additionally, from above-mentioned (6) formula and above-mentioned (5) formula, following (9) formula can be derived.In the present invention, it is preferred to meet (9)
Formula.
L≤V×5.6×10-10×exp(25000/T)…(9)
By above-mentioned (7)~(9) formula, such as when the temperature of the steel plate before the cooling that will be carried out using accelerated cooling device 5
820 DEG C are set to, the conveyance speed of steel plate is set to 0.28~2.50m/s, then from descaling device 7 to accelerated cooling device 5
Stabilization is cooled down under conditions of more than 12m and below 107m apart from L, is cooled down and is more stablized in more than 5m and below 47m, 1.3m with
Upper and below 12m cools down highly stable.
Thus, when below 12m is set to apart from L to accelerated cooling device 5 from descaling device 7, even if steel plate is removed
In the case of sending speed V slow (such as V=0.28m/s), cooling is also stablized, conversely because the conveyance speed V in steel plate is high
In the case of (such as V=2.50m/s), cooling is highly stable, therefore preferably.It should be noted that it is further preferred that being filled from de-scaling
Put 7 to accelerated cooling device 5 apart from L be below 5m.
Additionally, for typically for the major part of the steel plate for needing control cooling, it is contemplated that conveyance speed V is 0.5m/
More than s, under conditions of above-mentioned conveyance speed V, it is apart from L more preferably below 2.5m to cool down highly stable condition.
It should be noted that here, the temperature to the steel plate before the cooling that is carried out using accelerated cooling device 5 is set to
820 DEG C of situation is illustrated.It it is 820 DEG C for the temperature of the steel plate before the cooling that is carried out using accelerated cooling device 5
Situation in addition, similarly, below 12m is preferably from descaling device 7 to accelerated cooling device 5 apart from L, more preferably 5m with
Under, more preferably below 2.5m thus enables that cooling stabilization.This is because, working as what is carried out using accelerated cooling device 5
It is above-mentioned (7) formula, above-mentioned (8) formula, above-mentioned compared with T=820 DEG C of situation when the temperature of the steel plate before cooling is less than 820 DEG C
(9) value on the right of formula becomes much larger respectively, as long as in the case of T=820 DEG C it is appropriate set from descaling device 7 to
Accelerated cooling device 5 apart from L, then necessarily satisfying for above-mentioned (7) formula, above-mentioned (8) formula, above-mentioned (9) formula.Conversely, using acceleration
When the temperature of the steel plate before the cooling that cooling device 5 is carried out is higher than 820 DEG C, suitably adjusted by by the conveyance speed V of steel plate
Low, can cross is met above-mentioned (7) formula, above-mentioned (8) formula, above-mentioned (9) formula.
Then, accelerated cooling device of the invention 5 is illustrated.As shown in fig. 7, accelerated cooling device of the invention 5
Upper surface cooling device have：To the upper surface of steel plate 10 supply cooling water on catchment seat 11, catchment from described seat
The cooling water injection nozzles 13 of the bar-shaped cooling waters of injection of 11 pendencys, steel plate 10 and on catchment the dividing plate that sets between seat 11
15.It is preferred that setting multiple admission ports 16 and discharge outlet 17 on dividing plate 15, the admission port 16 is internally to insert the cooling
The admission port of the bottom of water injection nozzle, the discharge outlet 17 is the cooling water that will be supplied to the upper surface of the steel plate 10
To the discharge outlet of draining on the dividing plate 15.
Specifically, upper surface cooling device has：To the upper surface of steel plate 10 supply cooling water on catchment seat 11,
Catchment from described the cooling water injection nozzle 13 of the pendency of seat 11, and it is upper catchment between seat 11 and steel plate 10, in steel plate
The horizontally disposed dividing plate 15 with multiple through holes (admission port 16 and discharge outlet 17) in the range of width.Also, it is cold
But water injection nozzle 13 is formed by the pipe nozzle for spraying bar-shaped cooling water, and the insertion of its front end is arranged at passing through for the dividing plate 15
In through hole (admission port 16), so as to be set in the mode closer to the top of the bottom than dividing plate 15.It should be noted that in order to anti-
So as to block, cooling water injection nozzle 13 is preferably collected the foreign matter of the bottom only catchmented in seat 11 in suction upwards with its upper end
The mode that the inside of water seat 11 protrudes is penetrated catchments in seat 11.
Here, the bar-shaped cooling water in the so-called present invention, refers to the nozzle from circular (also including oval, polygonal shape)
The cooling water that ejiction opening is sprayed in the state of pressurizeing to a certain degree, and be the injection of the cooling water from nozzle ejiction opening
Speed be more than 6m/s, be preferably more than 8m/s, and from nozzle ejiction opening injection current section remain circular,
The cooling water of the current with continuity and straight ahead.That is, flowed with the freely falling body from pipe stratiform nozzle or sprayed
Drench such flowing difference being injected with drop state.
Why inserted in through hole so as to as the bottom than dividing plate 15 with the front end of cooling water injection nozzle 13
Mode closer to the top is set, because, it is assumed that even if in the case where the steel plate that front end tilts upward enters, can also prevent
Only cooling water injection nozzle 13 is damaged due to dividing plate 15.Thus, because cooling water injection nozzle 13 can be good
Cooled down in Long time scale under state, therefore, it is possible in the case where maintenance of equipment is not carried out, prevent the temperature of steel plate
Spend uneven generation.
Further, since in the front end insertion through hole of pipe nozzle 13, therefore as shown in figure 14, therefore it is without interference with stream
Cross the width flowing of the discharge water of the dotted arrow of the upper surface of dividing plate 15.Thus, sprayed from cooling water injection nozzle 13
Cooling water it is unrelated with width position, can equably reach steel plate upper surface, can carry out in the direction of the width
Even cooling.
If showing an example of dividing plate 15, as shown in figure 9, in dividing plate 15, in steel plate width with 80mm
Pitch, in conveyance direction with 80mm pitches with the latticed through hole for being provided with multiple a diameter of 10mm.Also, in admission port
The cooling water injection nozzle 13 of external diameter 8mm, internal diameter 3mm, length 140mm is inserted with 16.Cooling water injection nozzle 13 is with the lattice that interlock
Sub- shape arrangement, not passing through the through hole of cooling water injection nozzle 13 turns into the discharge outlet 17 of cooling water.As described above, in the present invention
Accelerated cooling device dividing plate 15 in set multiple through holes by almost equal number of admission port 16 and the structure of discharge outlet 17
Into, and they share effect, function respectively.
Now, with cooling water injection nozzle 13 pipe nozzle 13 internal diameter total sectional area compared with, discharge outlet 17 it is total
Sectional area fully becomes big, and ensures 11 times or so of the total sectional area of the internal diameter of pipe nozzle 13, as shown in fig. 7, to thickness
The cooling water of upper surface of steel plate supply is full of between steel plate surface and dividing plate 15, and dividing plate 15 is imported into by discharge outlet 17
Top, and discharged rapidly.Figure 10 is the flowing for illustrating the cooling draining near the steel plate width end on dividing plate
Front view.The drainage direction of discharge outlet 17 with cooling water injection direction conversely, in upward mode, through the top of dividing plate 15
Cooling draining changes direction to steel plate width outside, flow through the drainage flow path that catchments between seat 11 and dividing plate 15 so as to
By draining.
On the other hand, the example shown in Figure 11 is such example：Discharge outlet 17 is inclined on steel plate width,
Drainage direction is by towards in the way of on the outside of steel plate width and to inclined direction on the outside of width.Thus, due to
The flowing of discharge water 19 on dividing plate 15 on steel plate width becomes smooth, draining is promoted, therefore preferably.
Here, as shown in figure 12, if discharge outlet and admission port are arranged in same through hole, cooling water is to steel plate
After impact, through the top of dividing plate 15, towards steel plate width endwall flow between steel plate 10 and dividing plate 15.This
Sample, the flow of the cooling draining between steel plate 10 and dividing plate 15 is more closer to the end of plate width, therefore sprays cold
But the insertion of water 18 is detained moisture film so as to reach the power of steel plate closer to plate width end, can more be obstructed.
In the case of sheet metal, because plate width is at most 2m or so, therefore its influence is limited.However, especially
It is that its influence can not be ignored again in the case of steel plate of the plate width for more than 3m.Thus, steel plate width end
Cooling die down, the Temperature Distribution of steel plate width now turns into uneven Temperature Distribution.
On the other hand, as shown in figure 13, on accelerated cooling device of the invention, due to 17 points of admission port 16 and discharge outlet
And She Zhi not disperse the effect of feedwater and draining, therefore cool down draining by the discharge outlet 17 of dividing plate 15 in the upper of dividing plate 15
Swimmingly flow side.Thus, because the draining after cooling is quickly excluded from steel plate upper surface, therefore the follow-up cooling for supplying
Moisture film is detained in water energy enough easily insertions, can be adequately cooled ability.The temperature of steel plate width now point
Cloth turns into uniform Temperature Distribution, can obtain uniform Temperature Distribution in the direction of the width.
Incidentally, when the total sectional area of discharge outlet 17 is more than 1.5 times of total sectional area of the internal diameter of pipe nozzle 13
When, can quickly carry out the discharge of cooling water.This can be accomplished in the following manner, for example, outputed in dividing plate 15 and sprayed than pipe
The big hole of the external diameter of mouth 13, makes the number of discharge outlet identical with the number of admission port or more.
If the total sectional area of discharge outlet 17 is less than 1.5 times of the total sectional area of the inside diameter of pipe nozzle 13, discharge outlet
Flow resistance become big, occluded water becomes to be difficult to by draining, as a result can insertion be detained moisture film so as to reach steel plate surface
Cooling water inflow is greatly decreased, cooling capacity reduction, therefore not preferred.The total sectional area of discharge outlet 17 is more preferably pipe nozzle 13
More than 4 times of total sectional area of inside diameter.On the other hand, if discharge outlet is excessive, the diameter of section of discharge outlet becomes too much, then
The rigidity of dividing plate 15 diminishes, and becomes prone to damage after being impacted with steel plate.Thus, the total sectional area and pipe of discharge outlet
The ratio between total sectional area of internal diameter of nozzle 13 is preferably in the range of 1.5 to 20.
In addition, between inserting the outer peripheral face of pipe nozzle 13 and the inner surface of admission port 16 in the admission port 16 of dividing plate 15
Gap be preferably set to below 3mm.When above-mentioned gap is big, due to the shadow of the wake of cooling water sprayed from pipe nozzle 13
Ring, the cooling draining for being discharged to the upper surface of dividing plate 15 is introduced between the outer peripheral face of admission port 16 and pipe nozzle 13
Gap, so that be supplied on steel plate again, therefore cooling effectiveness is deteriorated.In order to be prevented and treated this, more preferably make pipe
The external diameter of nozzle 13 is almost identical with the size of admission port 16.However, it is contemplated that operating accuracy, alignment error, allow substantially
Influence is small until the gap of 3mm.More preferably below 2mm.
Additionally, in order that cooling water can insertion be detained moisture film so as to reach steel plate, it is necessary to make the interior of pipe nozzle 13
Footpath, length, the jet velocity of cooling water, nozzle distance are also optimized.
That is, nozzle inside diameter is preferably 3~8mm.When less than 3mm, attenuate from the water beam of nozzle injection, its gesture dies down.Separately
On the one hand, when nozzle diameter is more than 8mm, flow velocity dies down, and the power that moisture film is detained in insertion dies down.
The length of pipe nozzle 13 is preferably 120~240mm.Here, the length of so-called pipe nozzle 13, refers to from penetrating
The inflow entrance of a certain degree of upper end of nozzle in seat inside of catchmenting, to the length of the lower end of the nozzle in the admission port of insertion dividing plate.
When pipe nozzle 13 is shorter than 120mm, due to the distance between catchment a lower surface and dividing plate upper surface become it is too short (for example,
When a thickness that catchments is for 20mm, upper end of nozzle are that 20mm, nozzle lower end are to the insertion of dividing plate to the overhang catchmented in seat
During 10mm, the distance is less than 70mm.), the drainage space more upper than dividing plate diminishes, and cooling draining can not be arranged swimmingly
Go out.On the other hand, when 240mm is longer than, the pressure loss of pipe nozzle 13 becomes big, and the power that moisture film is detained in insertion dies down.
The jet velocity of the cooling water from nozzle needs to be more than 6m/s, preferably more than 8m/s.When less than 6m/s,
The power that moisture film is detained in cooling water insertion becomes extremely weak.When for more than 8m/s, due to being able to ensure that bigger cooling capacity, therefore
It is preferred that.In addition, 30 can be set to the distance on the surface of steel plate 10 from the lower end of the cooling water injection nozzle 13 of upper surface cooling
~120mm.When less than 30mm, the frequency of the impacting clapboard 15 of steel plate 10 becomes extremely many, plant maintenance becomes difficult.When being more than
During 120mm, the power that moisture film is detained in cooling water insertion becomes extremely weak.
For the cooling of steel plate upper surface, in order that cooling water spreads not on steel plate length direction, can be
On catchment the front and rear setting sealing roller (draining rollers) 20 of seat 11.Thus, cooled region length becomes constant, temperature
Control becomes easy.Here, because the flowing of the cooling water in steel plate conveyance direction is ended by sealing roller 20, cooling draining becomes
It is to be flowed to steel plate width outside.However, in the vicinity of sealing roller 20, cooling water is easy to be detained.
Therefore, as shown in Figure 8, it is preferred that thick among the row of the pipe nozzle 13 arranged on steel plate width
The cooling water injection nozzle of the most upstream side row of steel plate conveyance direction inclines 15~60 to the updrift side of steel plate conveyance direction
Degree, the cooling water injection nozzle of the most downstream side row of steel plate conveyance direction inclines 15 to the downstream direction of steel plate conveyance direction
~60 degree.Thus, due to that also can supply cooling water to close to the position of sealing roller 20, cooling water will not be near sealing roller 20
It is detained, cooling effectiveness is improved, therefore preferably.
On the lower surface of seat 11 and the distance of the upper surface of dividing plate 15 of above catchmenting, with a lower surface and the dividing plate upper surface of catchmenting
Steel plate width flow path cross sectional area in the space for being surrounded turns into the 1.5 of the total sectional area of cooling water injection nozzle internal diameter
Mode more than times is set, for example, more than 100mm or so.When above-mentioned steel plate width flow path cross sectional area is not cooling water
At more than 1.5 times of the total sectional area of injection nozzle internal diameter, discharged to the upper surface of dividing plate 15 from the discharge outlet 17 for being arranged at dividing plate
Cooling draining can not be smoothly exhausted to steel plate width.
For accelerated cooling device of the invention, the scope that can most play the water yield density of effect is 1.5m3/(m2·
Min more than).When water yield density is less than such case, being detained moisture film will not become so thick, even if making bar-shaped cooling in application
Water is freely fallen so as to cool down the known technology of steel plate, and sometimes, the temperature inequality of width will not also become so big.
On the other hand, even if being higher than 4.0m in water yield density3/(m2When min), the use of technology of the invention is also effective.So
And, there is problem, therefore 1.5~4.0m at practical aspect due to becoming high in equipment cost3/(m2Min it is) the most real
Water yield density.
It is especially have in configuration sealing roller before and after seat is catchmented in cooling for application cooling technology of the invention
Effect.Even if however, in no sealing roller, can also apply.For example, can also be applied to following cooling device, that is, the seat that catchments exists
(situation of 2~4m or so) more long on the length direction, Water spray for ejecting before and after this catchments seat purging, so as to prevent
To the cooling device of non-aqueous cold-zone domain leak.
It should be noted that in the present invention, the cooling device for steel plate lower face side is not particularly limited.In figure
7th, in the implementation method shown in 8, the cooling next part with the pipe nozzle 14 same with the cooling device of upper surface side is shown
The example of water seat 12.For the cooling of steel plate lower face side, by the cooling water that is sprayed after steel plate is impacted from
So fall, so even not as upper surface side cooling, the dividing plate that draining is discharged to steel plate width will be cooled down
15 is also possible.In addition, it is possible to use the known technology of the membranaceous cooling water of supply, spraying cooling water of spray form etc..
As previously discussed, on the manufacturing equipment of steel plate of the invention, as descaling device 6 and descaling device 7, pass through
More than the row of injection nozzle configuration 2 of de-scaling water, and the surface from the injection nozzle of the 2 row above to steel plate 10 is sprayed
Energy density E be set to that The adds up to 0.08J/mm2More than, the oxide skin produced in steel plate 10 can be made to become uniform,
Uniform cooling can be realized by accelerated cooling device 5.As a result, the excellent steel plate 10 of steel plate shape can be manufactured.
In addition, aligned to the shape of steel plate 10 by shape straightener 4, thereby, it is possible to make descaling device 6 and
The injection nozzle of descaling device 7 is close to the surface of steel plate 10.
In addition, when jet length H is (between the surface of the injection nozzle and steel plate 10 of descaling device 6 and descaling device 7
Distance) for more than 40mm and below 200mm when, de-scaling ability improve.Further, since for obtaining the energy density E's for specifying
Injection pressure, injection flow etc. it is small can also, the pumpability therefore, it is possible to make descaling device 6 and descaling device 7 is reduced.
In addition, by making to be cooled down from the descaling device 7 in the downstream among descaling device 6 and descaling device 7 to acceleration
Device 5 meets L≤V × 5 × 10 apart from L-9× exp (25000/T), can make the thick steel carried out using accelerated cooling device 5
The cooling of plate 10 becomes stabilization.
Additionally, as shown in fig. 7, on accelerated cooling device of the invention 5, from top cooling water injection nozzle 13 via giving
The mouth of a river 16 and the cooling water that supplies are so as to turn into the draining of high temperature and cold not intert top to the cooling of the upper surface of steel plate 10
But the discharge outlet 17 of water injection nozzle 13 is that drainage flow path flows from the width of the upper direction steel plate 10 of dividing plate 15.Due to
Draining after cooling is quickly excluded from steel plate 10, therefore is flowed via admission port 16 from top cooling water injection nozzle 13
Cooling water contacted with steel plate 10 successively, thereby, it is possible to obtain fully and in the direction of the width uniform cooling capacity.
It should be noted that it can be seen from result of study according to present inventor, do not carry out de-scaling of the present invention,
And the temperature inequality for having carried out the width of the steel plate of acceleration cooling turns into 40 DEG C or so.On the other hand, it is known that utilizing
Foregoing descaling device of the invention 6 and descaling device 7 and after having carried out de-scaling, entered using accelerated cooling device 5
The temperature of the width of the steel plate of capable cooling is uneven to be reduced to 10 DEG C or so.Additionally, also know, by descaling device
6 and after descaling device 7 carries out de-scaling, the width of the steel plate for having carried out accelerating cooling using the accelerated cooling device 5 shown in Fig. 7
The temperature inequality for spending direction is reduced to 4 DEG C of degree.It should be noted that the temperature on steel plate is uneven, by sweep type temperature
Degree meter determine accelerate cooling after steel plate surface temperature distribution, and from said determination result calculate width temperature not
.
In addition, as described herein, due to being aligned by the deformation produced in the 4 pairs of rollings of shape straightener, leading to
Crossing descaling device 6 and descaling device 7 carries out the de-scaling of steel plate 10, makes the controlling of cooling and becomes stabilization, therefore by thickness
Steel plate 10 itself the i.e. flatness that the downstream of steel plate manufacturing equipment is arranged at the shape straightener on line or under line and aligns
Height, and the temperature of steel plate 10 is also uniform.Thus, for being arranged at the straightening force of the shape straightener in the downstream and
Speech, substantially without raising.In addition, accelerated cooling device 5 and the distance between the shape straightener that the downstream is set can
The maximum length for being set to steel plate 10 than being manufactured in roll line is longer.Thus, due to the shape by being set in the downstream
Situations such as straightener implements reversely aligning is also more, can expect to prevent the anti-steel plate 10 for sending from being takeoff on carrying roller, from
And effect the problems such as impact accelerated cooling device 5, make in accelerated cooling device 5 cooling in the small temperature that produces it is inclined
Difference becomes uniform and avoids tilting the effect for occurring by what temperature deviation caused after aligning.
Embodiment 1
After being rolled using milling train 3, thickness of slab is 30mm, width for the steel plate of 3500mm passes through shape straightener 4
And after descaling device 6 and descaling device 7, cooling is controlled from 820 DEG C to 420 DEG C.Here, on the condition of cooling stabilization,
Calculated by above-mentioned (3), (4), (5) formula, from after using descaling device 7, the oxide skin removing of steel plate is terminated to by adding
The time t that fast cooling device 5 starts the cooling of steel plate is preferably below 42s, more preferably below 19s, is more preferably
Below 5s.
On descaling device 6 and descaling device 7, set in the following manner：The injection pressure of nozzle be 17.7MPa, every 1
The injection flow of nozzle is 45L/min (=7.5 × 10-4m3/ s), jet length (descaling device 6 and descaling device 7 injection spray
The surface distance of mouth and steel plate) for 130mm, nozzle spray angle be 66 °, the angle of attack be 15 ° and with the inlet zone of adjacent nozzle
It is set the nozzle that the mode that domain overlaps to a certain extent is arranged in the direction of the width 2 row, spray spray in the longitudinal direction
Thickness is penetrated for 3mm, spray jet width are 175mm.In addition, nozzle is set to flat spray spout.Here, the energy of de-scaling water is close
It is the above-mentioned value defined by water yield density × injection pressure × attack time to spend.Attack time (s) is to be sprayed to steel plate surface
Penetrate the time of de-scaling water, and tried to achieve divided by conveyance speed by spraying jet thickness.
On accelerated cooling device 5, the equipment for being provided with following streams is set to, the stream is as shown in Figure 7, Neng Gouxiang
Steel plate upper surface supply top from cooling water to dividing plate flow, further as shown in Figure 10, can be from steel plate width side
To the stream of side draining.In dividing plate, the hole of a diameter of 12mm is outputed in mode as grid, as shown in figure 9, to friendship
The admission port of wrong clathrate arrangement is inserted into top cooling water injection nozzle, and remaining hole is used as into discharge outlet.On catchment under seat
Surface is set to 100mm with the distance of dividing plate upper surface.
The top cooling water injection nozzle of accelerated cooling device 5 is set to internal diameter 5mm, external diameter 9mm, length 170mm, makes thereon
Hold to prominent in the seat that catchments.In addition, the jet velocity of bar-shaped cooling water is set into 8.9m/s.The nozzle section of steel plate width
Away from 50mm is set to, nozzle is arranged 10 row in the longitudinal direction between roller-way in the region of 1m.The water yield density of upper surface
It is 2.1m3/(m2·min).The nozzle lower end of upper surface cooling is arranged on the interposition of the upper and lower surface of the dividing plate of thickness of slab 25mm
Put, the distance to steel plate surface is set to 80mm.
It should be noted that for lower surface cooling device, as shown in fig. 7, in addition to without dividing plate, using with it is upper
The same cooling device of surface cooling device, 1.5 times of upper surface are set to by the jet velocity and water yield density of bar-shaped cooling water.
Then, as shown in table 1, to from descaling device 7 to accelerated cooling device 5 apart from L, the conveyance speed from steel plate
V and descaling device 7 carry out various change to the time t of accelerated cooling device 5.It should be noted that before the T in table 1 is for cooling
Steel plate temperature (K).
For steel plate shape, evaluated by aligning rate (%) again.Specifically, sticking up when steel plate whole length
Rise and/or the whole width of steel plate tilting within a reference value determined by standard of articles corresponding with the steel plate,
It is qualified to be then judged to, when more than a reference value, then be judged to align implementation part again, then aligns rate as (aligning implement part again
Number) calculating of/(whole numbers of object part) × 100.
[table 1]
Example of the present invention 1~5 on table 1, because energy density is 0.08J/mm2More than, therefore drawn by shape defect
That rises aligns that rate is low again, has obtained good result.It is thought that this is because, when being cooled down by accelerated cooling device 5,
Almost equably cooled down in the case of the deviation without surface temperature on width position, compared with prior art, machinery is special
The excellent and flatness of property (being considered to be caused by the Temperature Distribution of steel plate) is excellent, as a result, being rectified again by what shape defect caused
Frank step-down.In addition, being that oxide skin is removed on example of the present invention 1~5, surface characteristic is also good.It should be noted that closing
In the evaluation of surface characteristic, using the image on the steel plate surface for being cooled to room temperature, by (make use of oxide skin residual part and peel off
Hue difference between portion) image procossing judges oxide skin whether there is, and evaluated.
Particularly, on relative to conveyance direction, from most downstream arrange descaling device 7 to accelerated cooling device 5 distance
It is the example of the present invention 1~4 of 5m, from after the oxide skin removing of steel plate is terminated using descaling device 7, is filled to by accelerating cooling
The time t of the cooling of 5 beginning steel plates is put, the conveyance speed V with steel plate is unrelated, is carried out using accelerated cooling device 5
The more stable The Ru condition of cooling, i.e. below 19s.Therefore, then to align rate good, it is less than 5%.In addition, on example of the present invention
5, although it is qualified to align rate again, is 12%, but poor compared with example of the present invention 1~4.It is thought that this is because, being removed from oxide skin
After going to terminate to time for being begun to cool down by accelerated cooling device 5 it is long, be 46s, therefore oxide skin is thickening, and cooling becomes unstable
It is fixed.
On the other hand, for comparative example 1 (oxide skin for not implementing to be carried out using descaling device 6 and descaling device 7 is removed,
And carried out the cooling carried out using accelerated cooling device 5) for, become the oxide skin produced on the surface of steel plate
Uniformly, the cooling carried out using accelerated cooling device 5 is implemented.Therefore, because flatness is deteriorated (being presently considered to be due to thick steel
What the Temperature Distribution of plate caused), then the rate of aligning is changed into 40%, mechanical property also produces deviation.
In addition, on comparative example 2 (based on descaling device 6 and descaling device 7 impose a condition for：Hydraulic pressure 10MPa, every 1
The injection flow of nozzle is 39L/min (=6.5 × 10-4m3/ s), jet length is 130mm, and nozzle spray angle is 66 °, spray
The mouth angle of attack is 15 °, and energy density is 0.06J/mm2), by the energy density that de-scaling water has is big without fully change, therefore,
Oxide skin is partially stripped, and the Temperature Distribution of steel plate width is deteriorated.Then the rate of aligning is changed into 70%, mechanical property therefore,
Also deviation is produced.
On comparative example 3, (de-scaling number of times is 1 time, and the injection pressure of nozzle is 17.7MPa, the injection flow of every 1 nozzle
It is 45L/min (=7.5 × 10-4m3/ s), jet length is 130mm, and nozzle spray angle is 66 °, and the angle of attack is 15 °, and energy is close
It is 0.09J/mm to spend2), because de-scaling number of times is 1 time, the thermal stress effect produced during de-scaling is also only 1 time, therefore oxidation skin zone
Divide and peel off, the Temperature Distribution of steel plate width is deteriorated.Therefore, then the rate of aligning is changed into 72%, mechanical property also produces deviation.
On comparative example 4, (de-scaling number of times is 3 times, and the injection pressure of nozzle is 10MPa, and the injection flow of every 1 nozzle is
34L/min (=5.6 × 10-4m3/ s), jet length is 130mm, and nozzle spray angle is 66 °, and the angle of attack is 15 °, energy density
It is that 3 de-scalings add up to 0.06J/mm2), because the energy density entrained by de-scaling water is big without fully change, therefore, oxidation
Skin portion is peeled off, and the Temperature Distribution of steel plate width is deteriorated.Therefore, then the rate of aligning is changed into 69%, mechanical property is also produced
Raw deviation.
Description of reference numerals
1 heating furnace
2 descaling devices
3 milling trains
4 shape straighteners
5 accelerated cooling devices
6 descaling devices
6-1 de-scaling collecting heads
6-2 injection nozzles
7 descaling devices
7-1 de-scaling collecting heads
7-2 injection nozzles
10 steel plates
Catchment seat on 11
Catchment seat under 12
Cooling water injection nozzle (pipe nozzle) on 13
14 times cooling water injection nozzles (pipe nozzle)
15 dividing plates
16 admission ports
17 discharge outlet
18 spray cooling water
19 discharge water
20 sealing rollers
21 sealing rollers
22 spray patterns
Claims (9)
1. a kind of manufacturing equipment of steel plate, it is characterised in that configure hot-rolling mill, shape aligning successively from conveyance direction upstream side
Device, descaling device and accelerated cooling device, the injection nozzle of the descaling device configure 2 relative to the length direction of steel plate
Row, and the energy density E that the de-scaling water sprayed to the surface of steel plate from the injection nozzle of described 2 row has is set as adding up to
It is 0.08J/mm2More than.
2. a kind of manufacturing equipment of steel plate, it is characterised in that configure hot-rolling mill, shape aligning successively from conveyance direction upstream side
Device, descaling device and accelerated cooling device, the injection nozzle of the descaling device configure 2 relative to the length direction of steel plate
It is more than row, and the energy density E that the de-scaling water of the surface injection from the injection nozzle of the 2 row above to steel plate is had
It is set as adding up to 0.08J/mm2More than.
3. the manufacturing equipment of steel plate as claimed in claim 1 or 2, it is characterised in that when will be from the descaling device to institute
The conveyance speed for stating accelerated cooling device is set to V [m/s], when the steel plate temperature before cooling is set into T [K], from the de-scaling
Device to the accelerated cooling device meets following formula apart from L [m]：L≤V×5×10-9×exp(25000/T)。
4. the manufacturing equipment of steel plate as claimed in claim 3, it is characterised in that from the descaling device to it is described accelerate it is cold
But device apart from L be below 12m.
5. the manufacturing equipment of the steel plate as any one of Claims 1-4, it is characterised in that will be filled from the de-scaling
The injection nozzle put is set to more than 40mm and below 200mm to the surface of the steel plate apart from H.
6. the manufacturing equipment of the steel plate as any one of claim 1 to 5, it is characterised in that the acceleration cooling dress
Putting has：The seat that catchments of cooling water, the bar-shaped cooling of injection from the seat pendency that catchments are supplied to the upper surface of the steel plate
The cooling water injection nozzle of water and the dividing plate set between the steel plate and the seat that catchments, and on the dividing plate
Multiple admission ports and multiple discharge outlet are provided with, the bottom of the cooling water injection nozzle is internally inserted in the admission port,
The discharge outlet is fed into the cooling water of the upper surface of the steel plate to draining on the dividing plate.
7. a kind of manufacture method of steel plate, it is characterised in that sequentially carrying out hot-rolled process, thermal straightening operation and accelerating cooling
Operation in the thermal straightening operation and between accelerating refrigerating work procedure so that in the method for manufacturing steel plate, have de-scaling operation, institute
State and 0.08J/mm is added up to energy density E in de-scaling operation2Mode above carries out 2 de-scalings to the surface of steel plate.
8. a kind of manufacture method of steel plate, it is characterised in that sequentially carrying out hot-rolled process, thermal straightening operation and accelerating cooling
Operation in the thermal straightening operation and between accelerating refrigerating work procedure so that in the method for manufacturing steel plate, have de-scaling operation, institute
State and 0.08J/mm is added up to energy density E in de-scaling operation2More than mode carry out to the surface of steel plate more than 2 times and remove
Squama.
9. the manufacture method of steel plate as claimed in claim 7 or 8, it is characterised in that be completed to institute from the de-scaling operation
State the time t [s] for accelerating refrigerating work procedure to start and meet following formula：t≤5×10-9× exp (25000/T), wherein, T：Before cooling
Steel plate temperature (K).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-171045 | 2014-08-26 | ||
| JP2014171045 | 2014-08-26 | ||
| PCT/JP2015/004055 WO2016031168A1 (en) | 2014-08-26 | 2015-08-14 | Thick steel plate manufacturing facility and manufacturing method |
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| Publication Number | Publication Date |
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| CN106794500A true CN106794500A (en) | 2017-05-31 |
| CN106794500B CN106794500B (en) | 2020-01-31 |
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| CN201580045928.4A Active CN106794500B (en) | 2014-08-26 | 2015-08-14 | Manufacturing equipment and manufacturing method of thick steel plate |
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| Country | Link |
|---|---|
| EP (1) | EP3195946B1 (en) |
| JP (1) | JP6264464B2 (en) |
| KR (1) | KR101940428B1 (en) |
| CN (1) | CN106794500B (en) |
| BR (1) | BR112017003566B1 (en) |
| WO (1) | WO2016031168A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112739469A (en) * | 2018-09-12 | 2021-04-30 | Sms集团有限公司 | Method for manufacturing metal article |
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| KR102618999B1 (en) * | 2023-09-14 | 2023-12-28 | (주)은혜철강 | Insulation laminating equipment for manufacturing steel plate roof |
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| JPS5970418A (en) * | 1982-10-13 | 1984-04-20 | Sumitomo Metal Ind Ltd | Method for controlling operation of descaler in hot rolling |
| JP2003181522A (en) * | 2001-12-14 | 2003-07-02 | Nippon Steel Corp | Method and device for manufacturing steel plate having excellent surface property |
| US20120017660A1 (en) * | 2009-03-25 | 2012-01-26 | Jfe Steel Corporation | Steel plate manufacturing facility and manufacturing method |
| JP2012152761A (en) * | 2011-01-24 | 2012-08-16 | Jfe Steel Corp | Equipment and method for descaling thick steel plate |
| CN102756002A (en) * | 2011-04-28 | 2012-10-31 | 宝山钢铁股份有限公司 | Method for continuous jet descaling |
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| JPH0957327A (en) | 1995-08-22 | 1997-03-04 | Sumitomo Metal Ind Ltd | Scale removal method of steel plate |
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| JP5640614B2 (en) * | 2010-09-30 | 2014-12-17 | Ｊｆｅスチール株式会社 | High-strength steel pipe for line pipe, its manufacturing method, and high-strength steel pipe using high-strength steel sheet for line pipe |
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2015
- 2015-08-14 CN CN201580045928.4A patent/CN106794500B/en active Active
- 2015-08-14 KR KR1020177004919A patent/KR101940428B1/en active IP Right Grant
- 2015-08-14 WO PCT/JP2015/004055 patent/WO2016031168A1/en active Application Filing
- 2015-08-14 JP JP2016544932A patent/JP6264464B2/en active Active
- 2015-08-14 BR BR112017003566-9A patent/BR112017003566B1/en active IP Right Grant
- 2015-08-14 EP EP15836765.6A patent/EP3195946B1/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5970418A (en) * | 1982-10-13 | 1984-04-20 | Sumitomo Metal Ind Ltd | Method for controlling operation of descaler in hot rolling |
| JP2003181522A (en) * | 2001-12-14 | 2003-07-02 | Nippon Steel Corp | Method and device for manufacturing steel plate having excellent surface property |
| US20120017660A1 (en) * | 2009-03-25 | 2012-01-26 | Jfe Steel Corporation | Steel plate manufacturing facility and manufacturing method |
| JP2012152761A (en) * | 2011-01-24 | 2012-08-16 | Jfe Steel Corp | Equipment and method for descaling thick steel plate |
| CN102756002A (en) * | 2011-04-28 | 2012-10-31 | 宝山钢铁股份有限公司 | Method for continuous jet descaling |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112739469A (en) * | 2018-09-12 | 2021-04-30 | Sms集团有限公司 | Method for manufacturing metal article |
| CN112739469B (en) * | 2018-09-12 | 2024-02-02 | Sms集团有限公司 | Method for producing a metal object |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2016031168A1 (en) | 2016-03-03 |
| KR20170036003A (en) | 2017-03-31 |
| KR101940428B1 (en) | 2019-01-18 |
| JP6264464B2 (en) | 2018-01-24 |
| CN106794500B (en) | 2020-01-31 |
| EP3195946B1 (en) | 2021-01-27 |
| JPWO2016031168A1 (en) | 2017-04-27 |
| BR112017003566B1 (en) | 2022-12-06 |
| EP3195946A1 (en) | 2017-07-26 |
| BR112017003566A2 (en) | 2017-12-05 |
| EP3195946A4 (en) | 2017-09-06 |
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