CN105073293A - Thick steel plate manufacturing method and manufacturing device - Google Patents
Thick steel plate manufacturing method and manufacturing device Download PDFInfo
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- CN105073293A CN105073293A CN201480018326.5A CN201480018326A CN105073293A CN 105073293 A CN105073293 A CN 105073293A CN 201480018326 A CN201480018326 A CN 201480018326A CN 105073293 A CN105073293 A CN 105073293A
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- steel plate
- cooling
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- water
- descale
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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
-
- 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
- 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
- B21B2045/0212—Cooling devices, e.g. using gaseous coolants using gaseous coolants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
Abstract
The purpose of the present invention is to provide thick steel plate manufacturing method and manufacturing device capable of ensuring high-quality thick steel plates with minimal variation in quality of material. This method of manufacturing thick steel plates involves a hot-rolling step, a shape correction step and an accelerated cooling step, in that order, and also involves: between the shape correction step and the accelerated cooling step, a temperature adjustment step in which the thick steel plate surface is transformed either by air-cooling such that the thick steel plate surface temperature becomes less than the transformation point Ar3, or by water-cooling in which cooling water is supplied onto the upper and lower surfaces of the thick steel plate at a water density of 0.3-2.2 m3/m2*min; and, after the temperature adjustment step and before the accelerated cooling step, a descaling step in which the surface of the thick steel plate is sprayed with high-pressure water at an energy density of 0.05J/mm2 or greater.
Description
Technical field
The present invention relates to manufacture method and the manufacturing equipment of steel plate.
Background technology
Manufactured in the technique of steel plate by hot rolling, what cooling controlled is applied in expansion.Such as, as shown in Figure 1, after utilizing heating furnace 1 to be heated again by steel plate (not shown), in descale device 2, descale is carried out to steel plate.Then, after being utilized by steel plate roll mill 3 to be rolled, utilize shape correction device 4 to correct, then, in accelerated cooling device 5, carry out the controlled cooling model utilizing water-cooled or air cooling.It should be noted that, the arrow in figure is the direct of travel of steel plate.
When utilizing accelerated cooling device to carry out water-cooled to steel plate, the oxide skin on known steel plate surface as Fig. 2 is shorter for thicker then cool time, and therefore cooling velocity becomes large.But when scale thickness exists deviation, cooling velocity becomes uneven, therefore there is the material such as intensity, hardness and produce the such problem of fluctuation.
In addition, when scale thickness is uneven, as mentioned above, cooling velocity becomes uneven.In this case, steel plate surface temperature (hereinafter referred to as " cooling stops the temperature ") distribution on steel plate width when known accelerating cooling stops such as producing deviation as shown in Figure 3.Like this, the cooling of steel plate stops temperature producing deviation, therefore exists and can not obtain the such problem of uniform material.If illustrate concrete example, there is scale thickness in mixing on steel plate width when be the position of 40 μm and scale thickness being the position of 20 μm, is that cooling when being cooled to target temperature 500 DEG C from 800 DEG C of the steel plate of 25mm stops temperature to be 460 DEG C at the position of 40 μm, is 500 DEG C at the positions of 20 μm by thickness of slab.At the position of 40 μm, cooling stops temperature lower than target temperature 40 DEG C, consequently, can not obtain uniform material.
Therefore, Patent Document 1 discloses following method: controlled oxidization skin thickness and make cooling velocity even, thus realize the homogenising that cooling stops temperature.In patent document 1, the descale device being configured in the front and back of roll mill is used in rolling, when the cooling of the tail end of steel plate stops temperature lower than front end, control to make the injection water yield of the descale of the tail end-side mode more than the injection water yield of front, the length direction of steel plate controls oxide skin removal rate, residual thickness, the heat transfer coefficient of surface of steel plate when making controlled cooling model thus changes, thus makes the cooling of the length direction of steel plate stop homogeneous temperature.
Prior art document
Patent document
Patent document 1: Japanese Unexamined Patent Publication 6-330155 publication
Summary of the invention
Invent problem to be solved
In the prior art, realize cooling the homogenising stopping temperature by adjustment cooling water inflow, travelling speed.But, in the method, make because of the deviation of scale thickness cooling velocity produce deviation, therefore, be not only difficult to the homogenising realizing cooling velocity, and be difficult to realize the homogenising that cooling stops temperature.
In addition, in the method for patent document 1, if can not with online mode controlled oxidization skin removal rate, residual thickness, can not Heat Transfer Control coefficient, therefore, the homogenising of high-precision cooling velocity can not be realized.In addition, when making oxide skin removal rate change, it is different with stripping position that cooling stops temperature remaining position in oxide skin, and therefore material produces fluctuation.
The object of the invention is to solve the problem and provide and can guarantee that material fluctuates the manufacture method of steel plate of steel plate of few high-quality and manufacturing equipment.
For the method for dealing with problems
The present invention completes to solve above-mentioned existing issue, and its purport is as described below.
[1] a kind of manufacture method of steel plate, its order according to hot-rolled process, shape correction operation and accelerating cooling operation manufactures steel plate, it is characterized in that, have between above-mentioned shape correction operation and above-mentioned accelerating cooling operation: temperature regulates operation, by steel plate surface temperature air cooling extremely lower than Ar
3transformation temperature, or with 0.3 ~ 2.2m
3/ m
2minute upper and lower surface from water yield density to steel plate supply cooling water carry out water-cooled, make steel plate surface undergo phase transition thus; And descale operation, regulating after operation and the surface of the forward direction steel plate of above-mentioned accelerating cooling operation to spray energy density at said temperature is 0.05J/mm
2above water under high pressure.
The manufacture method of the steel plate [2] as described in [1], is characterized in that, in above-mentioned descale operation, makes the expulsion pressure of above-mentioned water under high pressure be more than 10MPa.
[3] a kind of manufacturing equipment of steel plate, it is characterized in that, by hot-rolling arrangement, shape correction device, temperature-adjusting device, descale device and accelerated cooling device with the configuration from carriage direction upstream side of this order, in said temperature adjusting device, by steel plate surface temperature air cooling extremely lower than Ar
3transformation temperature, or with 0.3 ~ 2.2m
3/ m
2minute water yield density carry out water-cooled to the upper and lower surface supply cooling water of steel plate, thus steel plate surface is undergone phase transition, and in above-mentioned descale device, it is 0.05J/mm that energy density is sprayed on the surface to steel plate
2above water under high pressure.
The manufacturing equipment of the steel plate [4] as described in [3], is characterized in that, in above-mentioned descale device, makes the expulsion pressure of above-mentioned water under high pressure be more than 10MPa.
Invention effect
According to the present invention, have between shape correction operation and accelerating cooling operation and steel plate surface temperature is reduced to lower than Ar
3transformation temperature thus to make the temperature that undergoes phase transition of steel plate surface regulate operation and regulate the rear surface to steel plate of operation to spray energy density in temperature be 0.05J/mm
2the descale operation of above water under high pressure, thereby, it is possible to the homogenising realizing cooling velocity and cooling stopping temperature.Consequently, material can be manufactured to fluctuate the steel plate of few high-quality.
Accompanying drawing explanation
Fig. 1 is the skeleton diagram of the manufacturing equipment representing existing steel plate.
Fig. 2 is when representing accelerating cooling, the figure of the relation of scale thickness and cool time and steel plate surface temperature.
Fig. 3 is that width position after representing accelerating cooling, steel plate stops the figure of the relation of temperature with cooling.
Fig. 4 is the skeleton diagram of the manufacturing equipment of the steel plate represented as an embodiment of the invention.
Fig. 5 is the presence or absence of the phase transformation representing steel plate surface and the figure of the relation of the energy density of water under high pressure and oxide skin stripping rate.
Fig. 6 be represent rolling terminate after steel plate surface temperature with for make oxide skin destroy needed for the figure of relation of expulsion pressure.
Fig. 7 is the figure to regulating the temperature difference on the steel plate surface before operation to descale operation to define from temperature.
Fig. 8 represents that the temperature slippage on steel plate surface stops the figure of the relation of the deviation of temperature with cooling.
Fig. 9 is the side view of the cooling device of an embodiment of the invention.
Figure 10 is the side view of other cooling devices of an embodiment of the invention.
Figure 11 is the figure be described the nozzle arrangement example of the partition of an embodiment of the invention.
Figure 12 be to partition above the figure that is described of the flowing of cooling draining.
Figure 13 be to partition above other figure of being described of flowing of cooling draining.
Figure 14 is the figure be described the steel plate width Temperature Distribution of conventional example.
Figure 15 is the figure be described the flowing of the cooling water in accelerated cooling device.
Figure 16 be to the partition in accelerated cooling device above the figure that is described of the non-interfering of cooling draining.
Detailed description of the invention
Below, be described for implementing mode of the present invention with reference to accompanying drawing.
Fig. 4 is the skeleton diagram of the manufacturing equipment of the steel plate represented as an embodiment of the invention.In the diagram, arrow is the carriage direction of steel plate.From the carriage direction upstream side of steel plate, be configured with heating furnace 1, descale device 2, roll mill 3, shape correction device 4, temperature-adjusting device 6, descale device 7, accelerated cooling device 5 successively.In the diagram, after utilizing heating furnace 1 pair of steel plate (not shown) to heat again, in descale device 2, in order to remove once oxidation skin, descale is carried out to steel plate.Then, utilized by steel plate roll mill 3 to carry out hot rolling, after utilizing shape correction device 4 to correct, in temperature-adjusting device 6, make steel plate surface temperature reduce, then, in descale device 7, carry out descale oxide skin removed completely further.Then, in accelerated cooling device 5, the controlled cooling model utilizing water-cooled or air cooling is carried out.
The invention is characterized in, between shape correction device 4 and accelerated cooling device 5, be configured with temperature-adjusting device 6 and descale device 7.And, in temperature-adjusting device 6, steel plate surface temperature is reduced to lower than Ar
3transformation temperature, thus steel plate surface is undergone phase transition.Then, carrying out spraying energy density to steel plate in descale device 7 is 0.05J/mm
2the descale of above water under high pressure.
Temperature-adjusting device 6 is configured between shape correction device 4 and descale device 7.Utilizing the temperature of temperature-adjusting device 6 to regulate in operation, steel plate surface temperature is reduced to lower than Ar
3transformation temperature, thus steel plate surface is undergone phase transition, thus, easily except descale in descale operation afterwards.
Regulate in operation in temperature, steel plate surface temperature is reduced to lower than Ar
3transformation temperature thus steel plate surface is undergone phase transition, causes the phase transformation of base steel thus, produces and misplaces, thus the closing force of oxide skin is reduced at the interface of oxide skin and base steel.Think that this is based on following mechanism.The surface of steel plate is cooled to lower than Ar
3during transformation temperature, base steel undergoes phase transition from austenite to ferrite.Now, base steel expands, and therefore, applies power, crack in interface the interface of oxide skin and base steel.Think consequently, the closing force of oxide skin reduces.Therefore, steel plate surface temperature is made to be reduced to lower than Ar
3transformation temperature thus steel plate surface is undergone phase transition, thus, when utilizing the descale operation of descale device 7, oxide skin removing becomes easy.It should be noted that, Ar
3transformation temperature can be passed through following formula (*) and calculate.
Ar
3＝910-310C-80Mn-20Cu-15Cr-55Ni-80Mo…(*)
Wherein, the symbol of element represents content (quality %) in the steel of each element.
Then, steel plate surface temperature will be made to be reduced to lower than Ar
3transformation temperature thus steel plate after steel plate surface is undergone phase transition carry out the descale except descale in descale device 7.Now, by steel plate spray energy density be 0.05J/mm
2above water under high pressure (in the present invention, being that the situation of more than 5MPa is as water under high pressure using expulsion pressure), can remove completely by oxide skin.By oxide skin being removed completely in this descale operation, afterwards utilize in the accelerating cooling operation of heating-cooling device 5, can carry out cooling control.Consequently, the homogenising of high-precision cooling velocity and the homogenising of cooling stopping temperature can being realized.It should be noted that, water under high pressure carries out spraying in the whole length of steel plate.
The present inventor use certain steel grade for the steel plate surface before descale operation phase transformation with presence or absence of impact investigated the energy density of water under high pressure and the relation of oxide skin stripping rate (oxide skin there occurs the area of stripping and the ratio of steel plate area).Result obtains opinion as shown in Figure 5.As shown in Figure 5, when energy density is large, oxide skin stripping rate becomes large, and, by making steel plate surface undergo phase transition, even if the little oxide skin that also can occur of energy density is peeled off.In addition, can be drawn by Fig. 5: when carrying out descale after the phase change, energy density is less than 0.05J/mm
2time, oxide skin stripping rate is low, and therefore, at a part of residual oxidization skin of steel plate, cooling stops temperature producing deviation and make material become uneven.Therefore, the energy density of water under high pressure is set as 0.05J/mm
2above.Be preferably 0.10J/mm
2above.It should be noted that, from the catabiotic viewpoint of the pump of supply water under high pressure, the energy density of water under high pressure is preferably 0.60J/mm
2below.
In the present invention, preferably in descale operation, spray pressure is the water under high pressure of more than 10MPa.By making expulsion pressure be more than 10MPa, oxide skin can be removed completely.Therefore, it is possible to the cooling velocity realized in accelerating cooling operation and cooling stop the homogenising of temperature.In order to destroy oxide skin, the pressure during droplet collision steel plate making water under high pressure is needed to exceed the hardness of oxide skin.The temperature on the steel plate surface after the present inventor terminates rolling with for make oxide skin destroy needed for the relation of expulsion pressure of water under high pressure investigate, result obtains the opinion of Fig. 6.As the present invention, when manufacture needs the steel plate of controlled cooling model, the temperature on the steel plate surface after rolling terminates is general the highest is also just about 900 DEG C.Therefore, in the present invention, in order to destroy oxide skin, the expulsion pressure of water under high pressure is preferably made to be more than 10MPa.
At this, to the energy density E (J/mm of the cooling water that steel plate sprays
2) be by the index of descale except the ability of descale, define as shown in following (1) formula.
E＝Q/(d×W)×ρv
2/2×t…(1)
Wherein, Q is the injection flow [m of the deoxidation severe edema due to hypofunction of the spleen
3/ s], the d spray injection thickness [mm] that is flat burner, W be flat burner spray injection width [mm], fluid density ρ [kg/m
3], steel plate collision time fluid velocity v [m/s], collision time t [s] (t=d/1000/V, travelling speed V [m/s]).
But the mensuration of fluid velocity v during steel plate collision is not necessarily easy, therefore, if the energy density E that (1) formula of will strictly obtaining defines, needs a large amount of labour.
Therefore, the present inventor is studied further, found that, as the energy density E (J/mm of the cooling water sprayed to steel plate
2) simple definition, water yield density × expulsion pressure × collision time can be adopted.At this, water yield density (m
3/ m
2minute) be the value calculated with " the injection flow ÷ cooling water collision area of cooling water ".Expulsion pressure (MPa) defines with the ejection pressure of cooling water.Collision time (s) is the value calculated with " travelling speed of the collision thickness ÷ steel plate of cooling water ".It should be noted that, the energy density utilizing this simply to define the water under high pressure of the present invention calculated is also same with Fig. 5 with the relation of oxide skin stripping rate.
Regulate in operation in temperature, by air cooling or water-cooled, steel plate surface temperature is reduced to lower than Ar
3transformation temperature.It should be noted that, when carrying out air cooling, on the roller-way transporting steel plate suitably air cooling to lower than Ar
3transformation temperature.
In the present invention, regulate in operation, when implementing water-cooled, with 0.3 ~ 2.2m in temperature
3/ m
2minute upper and lower surface from water yield density to steel plate supply cooling water.Water yield density is less than 0.3m
3/ m
2minute time, steel plate surface temperature can not be reduced to lower than Ar
3transformation temperature, can not make steel plate surface undergo phase transition.Consequently, residual oxidization skin on steel plate, controls even if carry out cooling in accelerating cooling operation afterwards, and cooling stops temperature also can produce deviation and make material become uneven.In addition, water yield density is greater than 2.2m
3/ m
2minute time, temperature described later regulates temperature slippage Δ T in operation more than 200 DEG C, and cooling stops temperature producing deviation and make material become uneven.
When making steel plate surface undergo phase transition in temperature-adjusting device 6, under the state that steel plate is attached with oxide skin, steel plate surface is cooled.The present inventor obtains following opinion: the temperature slippage in the cooling in temperature-adjusting device 6 is large, the attachment of oxide skin can affect the homogenising that cooling stops temperature, and cooling stops the deviation of temperature (difference of the actual surface of steel plate temperature after the target surface of steel plate temperature after accelerating cooling operation and accelerating cooling) to increase.At this, as shown in Figure 7, the temperature slippage Δ T on the steel plate surface in temperature-adjusting device 6 is defined as the difference of minimum arrival temperature on steel plate surface temperature when cooling starts and steel plate surface.
The steel plate that the present inventor uses the surface temperature after utilizing the rolling of roll mill to terminate to be 800 DEG C, thickness of slab is 25mm, regulates the order of operation, descale operation and accelerating cooling operation to manufacture steel plate according to temperature.At this, as being no matter before surface of steel plate when descale undergoes phase transition or the condition that oxide skin can both be removed by entire surface after undergoing phase transition, energy density during descale is made to be 0.2J/mm
2.It should be noted that, in accelerating cooling operation, be that the mode of 500 DEG C cools to make steel plate surface temperature.Its result is known, and temperature regulates the temperature slippage Δ T of operation to stop the relation of the deviation of temperature as shown in Figure 8 with cooling.According to Fig. 8, in order to obtain uniform material, the deviation of temperature is less than 25 DEG C, temperature regulates the temperature slippage Δ T of operation to be less than 200 DEG C preferably to make cooling stop.
For accelerated cooling device 5 of the present invention, as shown in Figure 9, preferably possesses the upper header 11 of the upper surface supply cooling water to steel plate 10, from the cooling water injection nozzle 13 of the bar-shaped cooling water of injection of this upper header 11 pendency and the partition 15 that is arranged between steel plate 10 and upper header 11, further, the admission port 16 partition 15 being provided with the bottom of multiple interpolation cooling water injection nozzle 13 and the discharge outlet 17 cooling water drainage of the upper surface being supplied to steel plate 10 is put into above partition 15.
Specifically, upper surface cooling device possess to steel plate 10 upper surface supply cooling water upper header 11, from this upper header 11 pendency cooling water injection nozzle 13 and be horizontally disposed with at whole steel plate width between upper header 11 and steel plate 10 and there is the partition 15 of multiple through hole (admission port 16 and discharge outlet 17).Further, cooling water injection nozzle 13 is formed by spraying the pipe nozzle 13 of bar-shaped cooling water, be inserted in its front end be arranged at above-mentioned partition 15 through hole (admission port 16) in and the mode more closer to the top than the bottom of partition 15 arrange.It should be noted that, for cooling water injection nozzle 13, blocking, preferably with in the mode injection upper header 11 making its upper end outstanding to the inside of upper header 11 to prevent the foreign matter of the bottom sucked in upper header 11.
At this, bar-shaped cooling water in the present invention refers to from the nozzle ejiction opening of circular (also comprising ellipse, polygon) with the cooling water sprayed by the state after to a certain degree pressurizeing, and is be more than 6m/s from the jet velocity of the cooling water of nozzle ejiction opening ejection, be preferably more than 8m/s and the cross section of the current ejected from nozzle ejiction opening roughly keeps the circular cooling water with the current of continuity and craspedodrome.That is, different from the free-falling stream sprayed from pipe laminar flow nozzle, the current that spray with the drop state as spraying.
To be inserted within the front end of cooling water injection nozzle 13 in through hole and the mode more closer to the top than the bottom of partition 15 arrange be because, even if when the steel plate of front end warpage upward enters, partition 15 also can be utilized to produce damage to prevent cooling water injection nozzle 13.Thus, cooling water injection nozzle 13 can cool chronically under good state, therefore, need not carry out equipment repairing etc., can prevent the generation of the temperature inequality of steel plate.
In addition, be inserted in through hole in the front end of pipe nozzle 13, therefore, as shown in figure 16, the width of the discharge water 19 of the dotted arrow that can not flow with the upper surface from partition 15 flows and interferes.Therefore, the cooling water ejected from cooling water injection nozzle 13 independently can arrive steel plate upper surface comparably with width position, can cool uniformly in the direction of the width.
If illustrate partition 15 one example, as shown in figure 11, on partition 15 with on steel plate width on 80mm, carriage direction for the spacing of 80mm offers with the trellis of chessboard the through hole that multiple diameter is 10mm.Further, in admission port 16, the cooling water injection nozzle 13 that external diameter is 8mm, internal diameter is 3mm, length is 140mm is inserted with.Cooling water injection nozzle 13 arranges with staggered clathrate, and the through hole that cooling water injection nozzle 13 does not pass through is the discharge outlet 17 of cooling water.Like this, multiple through holes that the partition 15 of accelerated cooling device of the present invention is arranged are made up of the admission port 16 of roughly the same quantity and discharge outlet 17, the effect of sharing separately, function.
Now, the total sectional area of discharge outlet 17 is fully greater than the total sectional area of the internal diameter of the pipe nozzle 13 of cooling water injection nozzle 13, ensure that about 11 times of the total sectional area of the internal diameter of pipe nozzle 13, as shown in Figure 9, the cooling water being supplied to steel plate upper surface riddles between steel plate surface and partition 15, pass through from discharge outlet 17 and be conducted to the top of partition 15, and being quickly discharged.Figure 12 be to partition above steel plate width end near the front view that is described of the flowing of cooling draining.The drainage direction of discharge outlet 17 is the upward direction contrary with cooling water injection direction, and the cooling draining passing the top of partition 15 changes direction outside steel plate width, flows through the drainage flow path between upper header 11 and partition 15 and is discharged.
On the other hand, the example shown in Figure 13 makes discharge outlet 17 in steel plate width surface thereof, drainage direction is set as towards the example of the incline direction outside width towards the mode outside steel plate width.Thus, the steel plate width flowing of the discharge water 19 above partition 15 becomes smooth, and draining is promoted, therefore preferably.
At this, as shown in figure 14, when discharge outlet and admission port are arranged in same through hole, after cooling water collision steel plate, be difficult to the top passing partition 15, thus to steel plate width endwall flow between steel plate 10 and partition 15.Like this, the end of flow more close to plate width of the cooling draining between steel plate 10 and partition 15 is then more, therefore, in plate width end, sprays the through delay moisture film of cooling water 18 and the power that arrives steel plate is more hindered.
When thin plate, plate width is about 2m to the maximum, and therefore its impact is limited.But particularly when plate width is the slab of more than 3m, its impact can not be ignored.Therefore, the cooling of steel plate width end dies down, and the Temperature Distribution of steel plate width now becomes uneven Temperature Distribution.
On the other hand, accelerated cooling device 5 of the present invention has been provided separately admission port 16 and discharge outlet 17 as shown in figure 15, shares the effect of feedwater and draining, therefore, makes cooling draining pass through from the discharge outlet 17 of partition 15 and successfully flow to the top of partition 15.Therefore, cooled draining is got rid of from steel plate upper surface rapidly, and therefore, the cooling water of follow-up supply can easily through delay moisture film, can obtain sufficient cooling capacity.The Temperature Distribution of steel plate width now becomes uniform Temperature Distribution, can obtain uniform Temperature Distribution in the direction of the width.
By the way, when the total sectional area of discharge outlet 17 is more than 1.5 times of the total sectional area of the internal diameter of pipe nozzle 13, the discharge of cooling water is carried out fast.Such as, partition 15 offers the hole larger than the external diameter of pipe nozzle 13, enable the number of discharge outlet identical with the number of admission port or more than it time realize above-mentioned effect.
When the total sectional area of discharge outlet 17 is less than 1.5 times of the total sectional area of the internal diameter of pipe nozzle 13, the flow resistance of discharge outlet increases, and occluded water is difficult to be discharged, and the cooling water inflow that result allows to through delay moisture film and arrives steel plate surface significantly reduces, cooling capacity reduces, therefore not preferred.Be more preferably more than 4 times.On the other hand, when discharge outlet too much or the diameter of section of discharge outlet is excessive, the rigidity of partition 15 reduces, and easily produces damage when steel plate is collided.Therefore, the total sectional area of discharge outlet and the ratio of the total sectional area of the internal diameter of pipe nozzle 13 are preferably the scope of 1.5 to 20.
In addition, the gap being inside inserted in the outer peripheral face of the pipe nozzle 13 in the admission port 16 of partition 15 and the inner peripheral surface of admission port 16 is preferably set to below 3mm.When this gap is large, due to the impact with stream of the cooling water that sprays from pipe nozzle 13, the cooling draining of discharging to the upper surface of partition 15 be introduced in admission port 16 with in the gap of the outer peripheral face of pipe nozzle 13, be again supplied on steel plate, therefore cooling effectiveness is deteriorated.In order to prevent above-mentioned situation, more preferably make the external diameter of pipe nozzle 13 roughly the same with the size of admission port 16.But consider operating accuracy, alignment error, the gap affecting in fact little below 3mm allows.More preferably below 2mm is set as.
In addition, in order to make cooling water can through delay moisture film and arrive steel plate, need to make the jet velocity of the internal diameter of pipe nozzle 13, length, cooling water, nozzle distance also reach best.
That is, nozzle inside diameter is preferably 3 ~ 8mm.When being less than 3mm, the water bundle sprayed from nozzle attenuates, and the flow of water dies down.On the other hand, when nozzle diameter is more than 8mm, flow velocity is slack-off, and the power of through delay moisture film weakens.
The length of pipe nozzle 13 is preferably 120 ~ 240mm.The length of pipe nozzle 13 described herein refer to from the inflow entrance of the to a certain degree upper end of nozzle of injection collector inside to the length of the lower end of the interior nozzle be inserted in the admission port of partition.Pipe nozzle 13 than 120mm in short-term, the distance of collector lower surface and partition upper surface become too short (such as, collector thickness is set to 20mm, the overhang that upper end of nozzle is outstanding in collector is set to 20mm, when nozzle lower end is set to 10mm to the insertion that partition inserts, above-mentioned distance is less than 70mm), therefore, from partition, the drainage space of upside reduces, and cooling draining can not successfully be discharged.On the other hand, time longer than 240mm, the pressure loss of pipe nozzle 13 increases, and the power of through delay moisture film weakens.
Need for more than 6m/s from the jet velocity of the cooling water of nozzle ejection, be preferably more than 8m/s.This is because when being less than 6m/s, the power of cooling water through delay moisture film is extremely weak.When for more than 8m/s, larger cooling capacity can be guaranteed, therefore preferably.In addition, 30 ~ 120mm can be set as from the distance on lower end to the surface of steel plate 10 of the cooling water injection nozzle 13 of upper surface cooling.When being less than 30mm, the frequency that steel plate 10 and partition 15 collide is very big, is difficult to carry out plant maintenance.During more than 120mm, the power of cooling water through delay moisture film is extremely weak.
In the cooling of steel plate upper surface, can not arrange except damping roller (water cuts ロ ー Le) 20 along the mode of steel plate length direction expansion in the front and back of upper header 11 to make cooling water.Thus, cooling zone consistent length, temperature controls to become easy.At this, utilize except the flowing of the cooling water of steel plate carriage direction stops by damping roller 20, therefore, cooling draining is to steel plate width flows outside.But, be easily detained cooling water except near damping roller 20.
Therefore, preferably as shown in Figure 10, in the row of the pipe nozzle 13 that steel plate width arranges, the cooling water injection nozzle of side, the most upstream row of steel plate carriage direction tilts 15 ~ 60 degree to the updrift side of steel plate carriage direction, and the cooling water injection nozzle of the most downstream side of steel plate carriage direction row is to the downstream direction inclination 15 ~ 60 degree of steel plate carriage direction.Thus, also can supply cooling water close to the position except damping roller 20, can not be detained cooling water near damping roller 20, cooling effectiveness improves, therefore preferably.
The distance of upper header 11 lower surface and partition 15 upper surface is arranged in the mode of more than 1.5 times of the total sectional area that the steel plate width flow path cross sectional area made in the space that surrounded by collector lower surface and partition upper surface is cooling water injection nozzle internal diameter, such as, be about more than 100mm.When this steel plate width flow path cross sectional area does not reach more than 1.5 times of the total sectional area of cooling water injection nozzle internal diameter, the cooling draining of discharging from the discharge outlet 17 be arranged at partition to partition 15 upper surface can not successfully be discharged along steel plate width.
In accelerated cooling device of the present invention, the scope that can play the water yield density of effect is 1.5m
3/ m
2more than minute.When water yield density is lower than above-mentioned scope, being detained moisture film can not be so thick, even if application makes bar-shaped cooling water freely fall the known technology cooled steel plate, the temperature inequality of width also can not be so large sometimes.On the other hand, even if in water yield density higher than 4.0m
3/ m
2minute when, use technology of the present invention to be also effective, but the problem of the practical aspects such as equipment cost rising can be there is, therefore, 1.5 ~ 4.0m
3/ m
2minute be the most practical water yield density.
Apply cooling technology of the present invention for situation about configuring except damping roller is effective especially in the front and back of cooling manifold.But, also can apply when not removing damping roller.Such as, also can be applied to collector longer in the longitudinal direction (when there is about 2m ~ about 4m), spray the water spray of purging in the front and back of this collector and prevent the cooling device leaked to non-water-cooled district.
It should be noted that, in the present invention, the cooling device for steel plate lower face side is not particularly limited.In the embodiment shown in Fig. 9,10, show the example of the cooling lower collector pipe 12 possessing the pipe nozzle 14 same with the cooling device of upper surface side.But in the cooling of steel plate lower face side, the cooling water ejected falls after colliding steel plate naturally, therefore, the partition 15 of cooling draining being discharged along steel plate width as upper surface side cooling can not also be there is.In addition, the known technology of supply membranaceous cooling water, vaporific misting cooling water etc. can also be used.
In addition, heating furnace 1 of the present invention and descale device 2 are not particularly limited, existing device can be used.For descale device 2, without the need to being the formation same with descale device 7 of the present invention.
Embodiment 1
Below, embodiments of the invention are described.In the following description, steel billet temperature is the temperature of surface of steel plate.
The manufacturing equipment of steel plate is as shown in Figure 4 used to manufacture steel plate of the present invention.After utilizing heating furnace 1 pair of steel billet to heat again, in descale device 2, remove once oxidation skin, utilize roll mill 3 to carry out hot rolling, utilize shape correction device 4 to carry out shape correction.After shape correction, utilize temperature-adjusting device 6 to regulate the temperature on steel plate surface, then, utilize descale device 7 to carry out descale.In descale device 7, jet length (distance on the injection nozzle of descale device 7 and the surface of steel plate) is set as 130mm, and nozzle spray angle is set as 32 °, and the nozzle angle of attack is set as 15 °.After utilizing descale device 7 to carry out descale, accelerated cooling device 5 is utilized to be cooled to 500 DEG C.At this, the descale operation after regulating operation and temperature to regulate about temperature, carries out under the conditions shown in Table 1.It should be noted that, the cooling length setting of temperature-adjusting device 6 is 1m.In addition, the Ar of the steel plate used
3transformation temperature is 780 DEG C.Thickness of slab after utilizing the rolling of roll mill 3 to terminate is 25mm, steel plate temperature is 830 DEG C.Temperature regulates the temperature slippage Δ T of operation only to adopt when water-cooled in temperature adjustment operation and measures.This is because, under utilizing air cooling to implement thermoregulator situation, the excessive caused problem of Yin Wendu decline can not be produced.
For obtained steel plate, to fluctuate few steel plate to obtain material, based on the relation of Fig. 8, it is qualified that the steel plate within stopping the deviation of temperature to be 25 DEG C cooling is set as.
Manufacturing condition and result are shown in Table 1.
In example 1, after rolling terminates, in temperature-adjusting device 6, by air cooling, steel plate surface temperature is reduced to 770 DEG C.Then, in descale device 7, be 0.08J/mm in energy density
2, expulsion pressure is 15MPa, the injection flow of each root nozzle is 40L/ minutes (=6.7 × 10
-4m
3/ s) condition under, in the whole length of steel plate after inject high pressure water, utilize accelerated cooling device 5 to carry out cooling to manufacture.After steel plate surface is ferrite from austenite phase transformation, carry out descale, therefore, it is possible to oxide skin removed completely, cooling stops the deviation of temperature (uneven hereinafter referred to as temperature) to be 10 DEG C.
In example 2, after rolling terminates, in temperature-adjusting device 6, with 1.0m
3/ m
2minute water yield density to the upper and lower surface supply cooling water and steel plate surface temperature is reduced to 750 DEG C of steel plate.Then, in descale device 7, with 0.08J/mm
2energy density in the whole length of steel plate, after inject high pressure water, utilize accelerated cooling device 5 to carry out cooling to manufacture.Be 1.0m for carrying out the water yield density of water-cooled in temperature-adjusting device 6
3/ m
2minute, therefore, steel plate temperature during descale is 750 DEG C, can carry out descale after steel plate surface is ferrite from austenite phase transformation.Temperature regulates the temperature slippage Δ T of operation to be also 120 DEG C, and therefore temperature is not 19 DEG C.
In example 3, after rolling terminates, by air cooling, steel plate surface temperature is reduced to 770 DEG C.Then, in descale device 7, expulsion pressure be 15MPa, the injection flow of each root nozzle is 40L/ minutes (=6.7 × 10
-4m
3/ s), energy density is 0.13J/mm
2condition under, in the whole length of steel plate after inject high pressure water, utilize accelerated cooling device 5 to carry out cooling to manufacture.Descale is carried out after steel plate surface is ferrite from austenite phase transformation.Therefore, it is possible to oxide skin removed completely, temperature is not 10 DEG C.
In example 4, after rolling terminates, in temperature-adjusting device 6, steel plate surface temperature is reduced to 770 DEG C.Then, in descale device 7, be 0.13J/mm in energy density
2, expulsion pressure is under the condition of 8MPa, in the whole length of steel plate after inject high pressure water, utilizes accelerated cooling device to carry out cooling to manufacture.Expulsion pressure is 8MPa, is the value in the present invention outside preferable range, therefore thinks, can not destroy oxide skin and slightly residual, and temperature is not 23 DEG C.Although the increase compared with the situation as the example 3 in preferable range of the present invention of the expulsion pressure of example 4, other aspects meet necessary condition in the present invention, therefore reach as within 25 DEG C of target.
In comparative example 1, after rolling terminates, in temperature-adjusting device 6, by air cooling, steel plate surface temperature is reduced to 770 DEG C.Then, in descale device 7, be 0.04J/mm in energy density
2, expulsion pressure is under the condition of 12MPa, in the whole length of steel plate after inject high pressure water, utilizes accelerated cooling device 5 to carry out cooling to manufacture.Energy density is 0.04J/mm
2, therefore think, remain oxide skin in a part for steel plate, temperature is not 36 DEG C.In addition, carried out visualization, result to the surface of the steel plate being cooled to the comparative example after room temperature 1, the tone on surface confirms inequality, and therefore estimate, the reason of temperature inequality is, remains oxide skin in a part for steel plate.
In comparative example 2, after rolling terminates, do not reduce the temperature on steel plate surface in temperature-adjusting device 6, the steel plate by steel plate surface temperature being 800 DEG C, in descale device 7, is 0.08J/mm in energy density
2, expulsion pressure is under the condition of 15MPa, in the whole length of steel plate after inject high pressure water, utilizes accelerated cooling device 5 to carry out cooling to manufacture.Energy density within the scope of the invention.But owing to carrying out descale under the surperficial state do not undergone phase transition of steel plate, therefore think, remain oxide skin in a part for steel plate, temperature is not 40 DEG C.In addition, carry out visualization, result to the surface of the steel plate being cooled to the comparative example after room temperature 2, the tone on surface confirms inequality, and therefore estimate, the reason of temperature inequality is, remains oxide skin in a part for steel plate.
In comparative example 3, after rolling terminates, in temperature-adjusting device 6, with 0.2m
3/ m
2minute upper and lower surface from water yield density to steel plate supply cooling water.Then, in descale device 7, with 0.08J/mm
2energy density in the whole length of steel plate, after inject high pressure water, utilize accelerated cooling device 5 to carry out cooling to manufacture.Water yield density is less than 0.2m
3/ m
2minute, therefore, steel plate temperature can only be reduced to 785 DEG C, under the state that steel plate surface does not undergo phase transition, carry out descale.Therefore, think and remain oxide skin in a part for steel plate, temperature is not 41 DEG C.Carried out visualization, result to the surface of the steel plate being cooled to the comparative example after room temperature 3, the tone on surface confirms inequality, and therefore estimate, the reason of temperature inequality is, remains oxide skin in a part for steel plate.
In comparative example 4, after rolling terminates, in temperature-adjusting device 6, with 2.4m
3/ m
2minute upper and lower surface from water yield density to steel plate supply cooling water.Then, in descale device 7, with 0.08J/mm
2energy density in the whole length of steel plate, after inject high pressure water, utilize accelerated cooling device 5 to carry out cooling to manufacture.Water yield density is greater than 2.4m
3/ m
2minute, therefore, the Δ T before descale during cooling is 220 DEG C, and temperature is not 27 DEG C.Carried out visualization, result to the surface of the steel plate being cooled to the comparative example after room temperature 4, the tone on surface confirms inequality, and therefore estimate, the reason of temperature inequality is, remains oxide skin in a part for steel plate.
Symbol description
1 heating furnace
2 descale devices
3 roll mills
4 shape correction devices
5 accelerated cooling devices
6 temperature-adjusting devices
7 descale devices
10 steel plates
11 upper headers
12 lower collector pipe
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 except damping roller
21 except damping roller
Claims (4)
1. a manufacture method for steel plate, its order according to hot-rolled process, shape correction operation and accelerating cooling operation manufactures steel plate, it is characterized in that,
Have between described shape correction operation and described accelerating cooling operation:
Temperature regulates operation, by steel plate surface temperature air cooling extremely lower than Ar
3transformation temperature, or with 0.3 ~ 2.2m
3/ m
2minute upper and lower surface from water yield density to steel plate supply cooling water carry out water-cooled, make steel plate surface undergo phase transition thus; And
Descale operation, after described temperature regulates operation and to spray energy density be 0.05J/mm on the surface of the forward direction steel plate of described accelerating cooling operation
2above water under high pressure.
2. the manufacture method of steel plate as claimed in claim 1, is characterized in that, in described descale operation, make the expulsion pressure of described water under high pressure be more than 10MPa.
3. a manufacturing equipment for steel plate, is characterized in that, by hot-rolling arrangement, shape correction device, temperature-adjusting device, descale device and accelerated cooling device with the configuration from carriage direction upstream side of this order,
In described temperature-adjusting device, by steel plate surface temperature air cooling extremely lower than Ar
3transformation temperature, or with 0.3 ~ 2.2m
3/ m
2minute water yield density carry out water-cooled to the upper and lower surface supply cooling water of steel plate, thus steel plate surface is undergone phase transition, and,
In described descale device, it is 0.05J/mm that energy density is sprayed on the surface to steel plate
2above water under high pressure.
4. the manufacturing equipment of steel plate as claimed in claim 3, is characterized in that, in described descale device, make the expulsion pressure of described water under high pressure be more than 10MPa.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013-065341 | 2013-03-27 | ||
| JP2013065341A JP5720714B2 (en) | 2013-03-27 | 2013-03-27 | Manufacturing method and equipment for thick steel plate |
| PCT/JP2014/001613 WO2014156085A1 (en) | 2013-03-27 | 2014-03-20 | Thick steel plate manufacturing method and manufacturing device |
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| Publication Number | Publication Date |
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| CN105073293A true CN105073293A (en) | 2015-11-18 |
| CN105073293B CN105073293B (en) | 2017-03-15 |
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| CN201480018326.5A Active CN105073293B (en) | 2013-03-27 | 2014-03-20 | The manufacture method and manufacturing equipment of steel plate |
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| Country | Link |
|---|---|
| EP (1) | EP2979769B1 (en) |
| JP (1) | JP5720714B2 (en) |
| KR (1) | KR101691020B1 (en) |
| CN (1) | CN105073293B (en) |
| TW (1) | TWI569898B (en) |
| WO (1) | WO2014156085A1 (en) |
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| JP6518948B2 (en) * | 2016-03-31 | 2019-05-29 | Ｊｆｅスチール株式会社 | Method and equipment for manufacturing steel plate |
| KR101940872B1 (en) * | 2016-12-21 | 2019-01-21 | 주식회사 포스코 | Hot rolled steel sheet for use in oil well pipe, steel pipe using the same and method for manufacturing thereof |
| CN112007963B (en) * | 2019-05-31 | 2022-08-12 | 宝山钢铁股份有限公司 | Control method and system for dynamically adjustable descaling pressure of strip steel surface |
| FR3112297B1 (en) * | 2020-07-07 | 2024-02-09 | Constellium Neuf Brisach | Cooling process and equipment on a hot reversible rolling mill |
| BR112022023731A2 (en) | 2020-06-04 | 2023-04-11 | Constellium Muscle Shoals Llc | COOLING PROCESS AND EQUIPMENT ON A HOT REVERSIBLE LAMINATOR |
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- 2014-03-20 EP EP14773154.1A patent/EP2979769B1/en active Active
- 2014-03-20 CN CN201480018326.5A patent/CN105073293B/en active Active
- 2014-03-20 WO PCT/JP2014/001613 patent/WO2014156085A1/en active Application Filing
- 2014-03-20 KR KR1020157025725A patent/KR101691020B1/en active IP Right Grant
- 2014-03-27 TW TW103111428A patent/TWI569898B/en active
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| CN1218725A (en) * | 1997-11-26 | 1999-06-09 | 川崎制铁株式会社 | Method for producing plating steel plate |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2979769B1 (en) | 2018-08-15 |
| KR101691020B1 (en) | 2016-12-29 |
| JP5720714B2 (en) | 2015-05-20 |
| KR20150122186A (en) | 2015-10-30 |
| WO2014156085A1 (en) | 2014-10-02 |
| CN105073293B (en) | 2017-03-15 |
| TW201446353A (en) | 2014-12-16 |
| EP2979769A1 (en) | 2016-02-03 |
| EP2979769A4 (en) | 2016-03-02 |
| JP2014188543A (en) | 2014-10-06 |
| TWI569898B (en) | 2017-02-11 |
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