CN100404154C - Controllable cooling method for thick steel plate, thick steel plate manufactured by the controllable cooling method, and cooling device for the thick steel plate - Google Patents

Controllable cooling method for thick steel plate, thick steel plate manufactured by the controllable cooling method, and cooling device for the thick steel plate Download PDF

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Publication number
CN100404154C
CN100404154C CNB200480016509XA CN200480016509A CN100404154C CN 100404154 C CN100404154 C CN 100404154C CN B200480016509X A CNB200480016509X A CN B200480016509XA CN 200480016509 A CN200480016509 A CN 200480016509A CN 100404154 C CN100404154 C CN 100404154C
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China
Prior art keywords
steel plate
cooling
control
control cooling
width
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Expired - Fee Related
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Chinese (zh)
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CN1805803A (en
Inventor
上冈悟史
井原健滋
弓削佳德
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JFE Steel Corp
JFE Engineering Corp
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NKK Corp
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B21B37/76—Cooling control on the run-out table
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Control Of Metal Rolling (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Abstract

A controllable cooling method for a hot rolled thick steel plate, a thick steel plate manufactured by the controllable cooling method, and a cooling device for the thick steel plate. Specifically, the controllable cooling method for the thick steel plate, the method wherein the temperature distribution of the thick steel plate in the lateral direction is uniformized before or at the beginning of the controllable cooling, and the entire part of the thick steel plate in the lateral direction is cooled by the controllable cooling device at a same cooling rate.

Description

The acceleration control process for cooling that is used for steel plate, the steel plate of its production, and cooling device
Technical field
The present invention relates to a kind of steel plate and cooling device that is used to finish the control cooling system (quickening the control cooling system) of hot rolling steel plate afterwards, controls cooling system production by this acceleration.
Background technology
In steel plate is produced, in order to ensure mechanical performance, specifically, and strength and stiffness, in some cases, steel plate stands to have the control cooling of high cooling velocity after rolling.Control cooling be a kind of be used for by hot rolling after from austenite to ferritic transformation range in fast cooling metal sheets so that thereby control and the crystal structure acquisition of adjusting transformation structure and steel have the technology of the material of target mechanical performance etc.In addition, in order to ensure along the uniformity of the material of whole steel plate and prevent that steel plate from producing strain after cooling, the whole surface of steel plate needs to cool off uniformly.Yet in existing control cooling technology, with respect to the zone line of steel plate, four fringe regions of steel plate are by sub-cooled after cooling.That is, the whole surface of steel plate is cooled off unevenly.
In order to satisfy the demand, a kind of technology that is used for heat of cooling steel plate below the Japanese patent application that also uncensored publication No. is 10-58026 has disclosed: allow a plurality of cooling waters screens with at a high speed and the surface of steel plate collide, above-mentioned a plurality of cooling waters screens are parallel to each other and form a predetermined angular and become a preset space length along the width of steel plate with the direct of travel of steel plate.Cooling water can be collided with colliding the zone, and the current that are divided into left and right sides both direction then equably are to form the flow path along surface of steel plate.Collide the surface and so be provided with, the end that makes each collide the zone does not overlap each other, and is continuous from the direct of travel of steel plate.
In uncensored publication No. is in the Japanese patent application of 6-184623 (No. 2698305, Japan Patent), as a kind of be used to cool off by finish rolling offseted because the method for the steel plate of the rolling gauffer that causes, this application has proposed following a kind of method: have the High-Pressure Water of the highly inclination injection of cooling capacity to steel plate from the ejection of slit spout cooling jet, flow to the edges of plate so that prevent current along width, described nozzle is arranged on the entrance side of control cooling device.
Uncensored publication No. is that the Japanese patent application of 61-219412 has disclosed a kind of method that is used for even cooling metal sheets, and this method comprises: before cooling, measure Temperature Distribution along the width of the hot steel plate of rolling mistake; Based on the measurement that obtains, calculate the distribution of the water yield on the width of hot steel plate; After the hot steel plate of having sent to that had been cooled before described hot steel plate cooled off, the calculating that utilizes this temperature data to correct the water yield distributed; And, based on the water distribution of the correction that obtains, adjust the water distribution of supplying with on the width of this hot steel plate.
Uncensored publication No. is the technology that the Japanese patent application of 58-32511 has disclosed a kind of steel plate after cooling hot-rolled, this technology comprises: cooling water can be collided with the upper surface and the lower surface of steel plate, with there being the curtain-shaped cover member of rill type to stop the edges of plate, directly collide the edges of plate simultaneously so that prevent the cooling water of upper surface.Promptly, a kind of method of cooling metal sheets has been proposed, comprise: based on the width of steel plate, be used for the water yield of upper and lower surface and the Temperature Distribution on the steel plate width direction when the cooling beginning, calculating utilizes the coverage width of the edges of plate that the curtain-shaped cover member of rill type covers, and makes to obtain the even temperature distribution on the width of steel plate when cooling is finished; And based on result of calculation, the position of the curtain-shaped cover member spare of control rill type is so that obtain such shelter width.
In uncensored publication No. is that the method that discloses in the Japanese patent application of 10-58026,6-184623 (Japanese Patent No. 2698305), 61-219412 and 58-32511 is a kind of method that is used for preventing to occur along width in cooling supercooling on the edges of plate.Expect to a certain extent to obtain above-mentioned effect.But the shortcoming of these methods is that whole steel plate is cooled off equably.The know-why of these methods is as follows: by only reducing in cooling on the width cooling velocity at the place, edges of plate, eliminate before the cooling or the middle sub-cooled that produces at the place, edges of plate on the width, so that the width along steel plate makes uniformity of temperature profile after cooling.Therefore,,, cooling velocity need be reduced to a certain degree, therefore cause improving the bottleneck of quality of materials for the uniformity of temperature profile that makes on surface of steel plate according to this method.In addition, according to these methods, the top of afoot rolling stock and tail end place can not guarantee that even temperature distributes, and therefore can produce strain in some cases after cooling.In addition, as described below, do not consider the variation of the hot conduction mechanism in cooling, for example film boiling of cooling period or transition boiling.Therefore, very difficult in place, edges of plate control cooling velocity.Under specific situation, can adjust parameter, for example the thickness of steel plate, the temperature when beginning to cool down, temperature and cooling water inflow when finishing cooling.Yet, under another kind cooling situation, often can not adjust parameter.In addition, do not specifically describe about this respect.Therefore, practical operation is very difficult.
It is a kind of in the method for carrying out current heat of cooling steel plate with a plurality of rollers in upside and the rolling hot steel plate of downside that uncensored publication No. is that the Japanese patent application of 61-15926 has disclosed, wherein, the on/off valve that is arranged on the collector can be controlled the time of opening as required, this collector be arranged on above the gap between above-mentioned roller and/or below.In addition, the method that is used for heat of cooling steel plate also comprises: be used to detect the checkout gear that passes through the position of hot steel plate, be used to detect before cooling the checkout gear and the cooling control calculation element of the Temperature Distribution on the longitudinal direction of hot steel plate; And be arranged on the position that valve will pass through corresponding to the top and/or the tail end of hot steel plate in transport process that stops at collector place, and be that the ON/OFF mode is controlled.In uncensored publication No. is in the Japanese patent application of 61-15926, in cooling, produce sub-cooled though prevented to go up in a longitudinal direction, but can not guarantee the uniformity of the temperature of the pars intermedia office of milled sheet on the width at the top and the tail end place of steel plate.Also there is not device to be used to eliminate the strain and the residual stress at place, edges of plate after cooling.
Uncensored publication No. is that the Japanese patent application of 11-267737 has disclosed and a kind ofly produces the technology of steel plate by control heat of cooling steel plate after hot rolling, described technology comprises: with being arranged between roughing mill and the finishing mill cooling device is set, on the width of steel plate, cooling off with Temperature Distribution, the temperature reduction amount at the place, edges of plate that makes is compensated, described temperature reduces the temperature that comprises generation when finishing from the heating furnace to the roughing and falls, fall with the temperature of during finish rolling, estimating at the place, edges of plate; And after finish rolling, controlling cooling under the cooling situation uniformly along the width of steel plate.In uncensored publication No. is in the Japanese patent application of 11-267737, though just the temperature at place, the edges of plate on width is compensated at the commitment before the finish rolling, but the Temperature Distribution of prediction before finish rolling, make when finishing finish rolling the Temperature Distribution on the steel plate width direction become evenly, this is difficult to accomplish.During rolling,, cool off by radiation and free convection from upper and lower surface and side at the place, edges of plate.In addition, in rolling,, remove descale with water spray, thereby reduced temperature for shape and the surface state of controlling steel plate.As a result, along the edge of width upper steel plate and the variation that may occurrence temperature distributes of the top of upper steel plate and tail end place in a longitudinal direction.Particularly, operating personnel often determine whether removing descale according to the state of steel plate.Therefore, the Temperature Distribution when finishing roughing by being controlled at, make when finishing finish rolling uniformity of temperature profile and have gratifying reproducibility, this is very difficult.In addition, in control cooling, not have to describe the concrete grammar that makes along the uniformity of temperature profile of the width of steel plate, therefore cause being difficult to realization.
In uncensored publication No. is that the Japanese patent application of 2001-137943 has disclosed a kind of method that is used to control glacing flatness, and described method comprises: the edge of metal heating plate after hot rolling is finished flattens plate with water cooling plate and/or heating then.Yet, be in the Japanese patent application of 2001-137943 in uncensored publication No., when heating with stove, because the lower efficiency of heating surface, so must use high-octane stove, thus cost increased.In addition, the heating part of steel plate is oxidized, has therefore adversely reduced surperficial characteristic.When heating by eddy-current heating, facility cost and heating cost are very high, and this also is unpractical.Even in some way can be so that the uniformity of temperature profile on the width of steel plate before cooling, do not describe cooling metal sheets and make the method for the uniformity of temperature profile on the width of steel plate.Therefore, in some cooling devices, can take place because the sub-cooled of above-described boiling phenomenon.On the other hand, the water that accumulates on the upper surface of steel plate lands from the edge, thereby has increased the water yield by the edge, therefore causes sub-cooled.
Summary of the invention
In order to address the above problem, in that the steel plate of finishing after rolling is controlled in the cooling, the invention provides a kind of control process for cooling that has high cooling velocity on the whole that is used for steel plate, make the uniformity of temperature profile of width and longitudinal direction on the surface of steel plate; Steel plate by described control process for cooling production; And a kind of equipment.In addition, the invention provides a kind of process for cooling that is used for steel plate, the distribution of residual stress is uniformly on the width of steel plate and the longitudinal direction, prevents the deformity of converted products, for example the camber after the bar cutting; Steel plate by described control process for cooling production; And a kind of equipment.
The present invention relates to a kind of steel plate process for cooling that is used to finish after the hot rolling, described technology comprises: first cooling step, and in the uniformity of temperature profile that makes on the width of steel plate, cooling metal sheets; And second cooling step, after the uniformity of temperature profile on the width of steel plate, the whole width of striding steel plate is with identical cooling velocity control cooling metal sheets.
In the technology that is used for controlling the steel plate after hot rolling is finished in cooling, first cooling step comprises: when at least one the entrance side cooled region place in comprising transmission type (transfer-type) the control cooling device of a plurality of independent cooled regions limits the cooling water inflow at two edges that are used for the broad ways upper steel plate, cool off this steel plate; And second cooling step comprise: the cooled region place after this at least one entrance side cooled region, the whole width of striding steel plate is with identical this steel plate of cooling velocity control cooling.
In the technology that is used for controlling the steel plate after hot rolling is finished in cooling, first cooling step comprises: when being used for the cooling water inflow at two edges of steel plate broad ways with the radiator cooler restriction, cool off this steel plate; And second cooling step comprise: with the transmission type control cooling device of the conveyor side that is arranged on radiator cooler, the whole width of striding steel plate is with identical this steel plate of cooling velocity control cooling, and described transmission type control cooling device comprises a plurality of independently cooled regions.
Control the technology of cooling metal sheets in above-mentioned being used for, be used for along the cooling water inflow at two edges of width upper steel plate with the curtain-shaped cover member restriction that is arranged on the place, edges of plate on the width.
Control the technology of cooling metal sheets in above-mentioned being used for, in the previous section of control cooling device, restriction is used for the cooling water inflow on upper steel plate top and tail end in a longitudinal direction.
In the technology of above-mentioned control cooling metal sheets,, limit the steel plate top that is used for going up in a longitudinal direction and the cooling water inflow of tail end by radiator cooler or radiator cooler and control cooling device.
In the technology of above-mentioned control cooling metal sheets, by being used to control the control device of the water yield, limit the steel plate top that is used for going up in a longitudinal direction and the cooling water inflow of tail end, pass through signal, one section preset time of control device operation in response to each end in the top of upper steel plate in a longitudinal direction and the tail end.
Control the technology of cooling metal sheets in above-mentioned being used for, comprise in the previous section of control in the cooling device and can limit the curtain-shaped cover member that is used for along the water consumption at the edge of width upper steel plate, described curtain-shaped cover member is arranged on along the edge of width upper steel plate and is arranged in each zone, and each curtain-shaped cover member is that each zone, each upper surface or each lower surface stop the cooling water that is used for along each edge of width upper steel plate independently.
Control the technology of cooling metal sheets in above-mentioned being used for, described technology also comprises: based on being used to measure along measurement mechanism measured Temperature Distribution before the control cooling of the Temperature Distribution of width upper steel plate, analyze along the temperature reduction amount of each edge of width upper steel plate and temperature sloping portion and along the distance between each edge of width steel plate; Based on the result who analyzes, calculate the quantity of the cooled region that covers, and calculate coverage amount with the curtain-shaped cover member in each zone in the previous section that is arranged on the control cooling device; And, control this curtain-shaped cover member based on result of calculation.
Control the technology of cooling metal sheets in above-mentioned being used for, described technology also comprises: before auxiliary cooling, measure the Temperature Distribution on the width; By the Temperature Distribution that measures, analyze along the temperature reduction amount of each edge of width upper steel plate and produce part that temperature descends and length along each edge of the steel plate of width; Based on the result who analyzes, calculate masking amount and the cool time of in radiator cooler, using curtain-shaped cover member; And, be controlled at the curtain-shaped cover member in the radiator cooler and the transfer rate of steel plate based on result of calculation.
After hot rolling, produce a kind of steel plate by above-mentioned control process for cooling.
Equipment in the control cooling that is used for steel plate, the equipment of this control cooling comprises transmission type control cooling device, and described transmission type control cooling device comprises a plurality of independently cooled regions, at each cooled region place, cooling water can be 1,200 liter of/minute rice with jet density 2(hereinafter all use L/minm 2Expression) or bigger density flow, and be used for limiting the curtain-shaped cover member that is used for along the cooling water inflow at two edges of width upper steel plate and be arranged in the cooled region of previous section.
Equipment in the control cooling that is used for steel plate, the equipment of this control cooling comprises radiator cooler and control cooling device, described radiator cooler and described control cooling device be provided with the order be after the conveyor side of roller mill, the jet density of the cooling water in radiator cooler is 500L/minm 2Perhaps littler, the curtain-shaped cover member that is used for limiting along the used cooling water inflow in two edges of width upper steel plate is arranged on radiator cooler, the control cooling device is the transmission type device that comprises a plurality of independent cooled regions, and the cooling water in each cooled region can be with 1200L/minm 2Perhaps bigger jet density flows.
In the equipment of the above-mentioned control cooling that is used for steel plate, the work of control curtain-shaped cover member, feasible uniformity of temperature profile on the width of steel plate.
Equipment in the above-mentioned control cooling that is used for steel plate, the equipment of this control cooling also comprises the control device that is used to control the water yield, pass through signal, one section preset time of described control device operation in response to the top of upper steel plate in a longitudinal direction and each end in the tail end.
At the equipment of the above-mentioned control cooling that is used for steel plate, the equipment of this control cooling also comprises slit spout cooling jet.
At the equipment of the above-mentioned control cooling that is used for steel plate, radiator cooler also comprises the laminar flow cooling jet, and this control cooling device also comprises slit spout cooling jet.
Equipment in the above-mentioned control cooling that is used for steel plate, cool off in territory in each district that each curtain-shaped cover member all is arranged in the previous section of controlling cooling device, and each covers member is that each zone, each upper surface or each lower surface stop the cooling water that is used for along each edge of width upper steel plate independently.
Equipment in the above-mentioned control cooling that is used for steel plate, the equipment of this control cooling also comprises: analytical equipment, be used for by being used to measure, analyze along the temperature reduction amount of each edge of width upper steel plate and produce the length of temperature sloping portion distance along each edge of width upper steel plate along measurement mechanism measured Temperature Distribution before the control cooling of the Temperature Distribution of width upper steel plate; Calculation element is used for calculating the quantity of the cooled region that covers based on the result who analyzes, and calculates the masking amount with the curtain-shaped cover member in each zone in the previous section that is arranged on the control cooling device; And controlling organization, be used for based on result of calculation, control described shielding portion.
At the above-mentioned equipment that is used for the control cooling of steel plate, the equipment of this control cooling also comprises: measurement mechanism is used in the Temperature Distribution of measurement before the auxiliary cooling on the width; Analytical equipment is used for based on the Temperature Distribution that measures, and analyzes along the temperature reduction amount of each edge of width upper steel plate and temperature sloping portion and along the distance between each edge of width upper steel plate; Calculation element is used for based on analysis result, calculates masking amount and cool time at the usefulness curtain-shaped cover member of radiator cooler; And controlling organization, be used for based on result of calculation, be controlled at the curtain-shaped cover member in the radiator cooler and the transfer rate of steel plate.
At the equipment of the above-mentioned control cooling that is used for steel plate, before the control cooling device or between radiator cooler and control cooling device finisher is being set.
Description of drawings
Fig. 1 shows the relation between cooling down high-temperature steel plate light plate surface temperature and heat flux value;
Fig. 2 shows flowing of on cooling metal sheets light plate upper surface water;
Fig. 3 shows when the cooling of controlling with existing technology along width upper steel plate edge, along the edge of width upper steel plate and the temperature curve at middle place;
Fig. 4 shows when with the cooling controlled according to the technology of first embodiment of the invention along the edge of width upper steel plate, along the edge of width upper steel plate and the temperature curve at middle place;
Fig. 5 shows when with the cooling controlled according to the technology of second embodiment of the invention along the edge of width upper steel plate, along the edge of width upper steel plate and the temperature curve at middle place;
Fig. 6 is the conceptual scheme according to the control cooling device of first embodiment of the invention;
Fig. 7 is the conceptual scheme according to control cooling device of the present invention;
Fig. 8 is the conceptual scheme that is used to cover the curtain-shaped cover member configuration of cooling water according to the present invention in control in the cooling device;
Fig. 9 shows the supercooled definition along the edge of width upper steel plate;
Figure 10 shows the concrete control technology according to first embodiment of the invention;
Figure 11 show when the time according to the first embodiment of the invention cooling metal sheets and when by another kind of technology cooling metal sheets after cooling along the Temperature Distribution of width upper steel plate;
Figure 12 shows according to first embodiment of the invention and is used to control the structure of the control cooling device of the water yield on upper steel plate top and tail end place in a longitudinal direction;
Figure 13 shows according to first embodiment of the invention and is used to control the structure of the control cooling device of the water yield on upper steel plate top and tail end place in a longitudinal direction;
Figure 14 shows the supercooled definition of going up in a longitudinal direction at the top and the tail end place of steel plate;
Each shows Figure 15 A and 15B according to the first embodiment of the invention cooling water by the operation on the top of upper steel plate in a longitudinal direction;
Each shows Figure 16 A and 16B according to the first embodiment of the invention cooling water by the operation of the tail end of upper steel plate in a longitudinal direction;
Figure 17 is the conceptual scheme that is used for the control cooling device of cooling metal sheets according to second embodiment of the invention;
Figure 18 is the conceptual scheme that is used to stop the curtain-shaped cover member configuration of cooling water according to the present invention in control in the cooling device;
Figure 19 shows the operation of cooling facility for laminar flow when the top by upper steel plate in a longitudinal direction;
Figure 20 shows the operation of laminar flow cooling device when the tail end by upper steel plate in a longitudinal direction;
Figure 21 is the layout drawing of the finisher 60 that is provided with in the present invention;
Figure 22 shows the position that is used to cut cooled steel plate according to embodiments of the invention;
Figure 23 shows a kind of method of measuring camber according to embodiments of the invention when the steel plate 52 of cooling cuts out;
Figure 24 shows a kind of method of measuring camber according to embodiments of the invention when the steel plate 55 of cooling cuts out;
Figure 25 and 26 shows size and the configuration according to embodiments of the invention control cooling device;
Figure 27 shows the structure that is arranged on the curtain-shaped cover member in the radiator cooler according to embodiments of the invention;
Figure 28 shows the configuration according to the curtain-shaped cover member of embodiments of the invention in radiator cooler.
Reference numeral:
1: the roller mill that is used for steel plate
2: steel plate
3: the roller platform
10: cooling facility for laminar flow
11: upper header
12: lower collector pipe
13 and 14: current
15: curtain-shaped cover member
16: the mechanism that curtain-shaped cover member is moved forward and moves backward
17: the unit of taking pictures
20: slit spout cooling jet
21: upper header
22: lower collector pipe
23: go up slit spout cooling jet
24: following slit spout cooling jet
25: the previous section of control cooling device
26: the aft section of control cooling device
27: distributing roller
28: go up curtain-shaped cover member
29: following curtain-shaped cover member
30: thermometer in the radiator cooler porch
31: thermometer in control cooling device porch
32: thermometer in control cooling device exit
41: flow controller
42: triple valve
51: the top sample
52: be used to measure along the sample of the camber of the bar of width cutting
53: the intermediate sample on width and the longitudinal direction
54: the tail end sample
55: be used to measure the sample of the camber of the bar of cutting in a longitudinal direction
60: finisher
The specific embodiment
To contrast existing technology below and describe know-why of the present invention.Fig. 3 shows in existing technology in order to prevent along the supercooled steel billet temperature curve at the edge of width upper steel plate.In existing technology, before the control cooling, be lower than the temperature of steel plate centre along the temperature at width upper steel plate edge.In control cooling subsequently,, reduce by cooling water inflow along width upper steel plate edge by curtain-shaped cover member being set and adjusting cooling water inflow at edge along the width upper steel plate.As a result, compare with the cooling velocity in the middle of the steel plate, the cooling velocity of edge has reduced.In this existing technology, when cooling finishes, be the same in temperature along the edge of width upper steel plate and place in the middle of steel plate.As described below, shortcoming that should existing technology is: because be lower than the cooling velocity at place in the middle of steel plate along the cooling velocity of width upper steel plate edge, so different with the quality of locating in the middle of steel plate along the quality of materials of the edge of width upper steel plate.
It is believed that, because following three mechanism have produced the supercooling in four neighboring areas of steel plate.
(1) because the sub-cooled that the cooling of the radiation in rolling causes
Producing in the steel plate by common rolling mill practice, the side surface in rolling except upper surface and lower surface is by four neighboring areas coming cooling metal sheets from the radiation cooling (air cooling) of side.Therefore, the temperature at place, four neighboring areas is lower than the temperature at place in the middle of steel plate.Even when cooling off the whole surface of cooling metal sheets by control with even cooling energy, this Temperature Distribution is still keeping after cooling, this be because: before cooling, four neighboring areas of steel plate have been compared by sub-cooled with the centre of steel plate.
(2) because the sub-cooled that boiling phenomenon causes in water cooling
If existing variation in temperature distribution before the cooling metal sheets in steel plate, this variation in temperature distribution can increase so.Describe this situation in detail with reference to figure 1.It is 700 ℃ or the surface temperature of higher steel plate light plate and the relation between the heat flux (in the transfer of per unit area and unit interval interior heat flux) that Fig. 1 shows in surface temperature.Film boiling takes place in the high surfaces temperature place at steel plate.Than the low surface temperature place nucleateboiling takes place at steel plate.Transition boiling takes place in the place, medium temperature zone between them.In the film boiling at the high surfaces temperature place that occurs in steel plate, between surface of steel plate and cooling water, produce the steam film.Heat transmits based on the conduction of the heat in the steam film, therefore causes low heat flux (cooling energy).In occurring in the nucleateboiling than the low surface temperature place of steel plate, complicated phenomenon as follows has taken place: surface of steel plate directly contacts with cooling water.Cooling water partly evaporates from surface of steel plate, thereby forms steam bubble.Because the cooling water around steam bubble, the steam bubble of generation condenses immediately and disappears.Therefore the formation of steam bubble and the stirring cooling water that disappears produce high significantly heat flux (cooling energy).As shown in Figure 1, occur in the zone at film boiling and nucleateboiling, hot transmitting characteristic is arranged: the higher temperature of steel plate produces higher heat flux (cooling energy), and the lower temperature of steel plate produces lower heat flux (cooling energy).Therefore, hot transmitting characteristic is arranged: when in steel plate, having variation in temperature distribution before the cooling, the higher temperature of steel plate partly produces higher cooling velocity, and the lower temperature of steel plate partly produces low cooling velocity, thereby has reduced the variation in temperature distribution before the cooling.When the surface temperature of steel plate is in the medium temperature zone time, film boiling and nucleateboiling all take place, and transition boiling promptly takes place.Compare with the film boiling nucleateboiling, in transition boiling, a kind of like this phenomenon takes place: heat flux (cooling energy) increases along with the reduction of steel billet temperature.That is, the lower temperature of steel plate produces higher heat flux (cooling energy).Therefore, when existing variations in temperature before the cooling in steel plate, it is much colder that the lower temperature of steel plate partly becomes.As a result, variation in temperature distribution has increased after cooling.Represented as dotted line among Fig. 1, when having increased the jet density of cooling water, surface temperature Ttf changes high temperature into, and boiling mechanism becomes transition boiling by film boiling at temperature T tf place.As a result, transition boiling began in the starting stage of cooling.When the jet density of further increase cooling water, can come cooling metal sheets based on complex cooling from the cooling starting stage.In contrast, when the jet density of cooling water reduced, surface temperature Ttf changed lower temperature into, and boiling mechanism becomes transition boiling by film boiling at temperature T tf place.As a result, can seethe with excitement cooling metal sheets by based thin film in whole cooling period.
In the general control cooling, do not consider this point.Often the jet density with the cooling water that causes transition boiling cools off, thereby in some cases, in the variation in temperature distribution that has increased after the cooling in steel plate.
(3) because the transition that the draining on the steel plate upper surface causes cooling
When steel plate was arranged on horizontal level as shown in Figure 2 and is cooled, cooling water flow fell to the periphery of steel plate upper surface and from the edges of plate.At the marginal point A place of steel plate upper surface,, also cool off with the cooling water that flows to the steel plate edge except from the cooling water of the nozzle ejection of the top that is arranged on steel plate.Therefore, therefore the cooling water inflow increase by the steel plate top surface edge has increased cooling velocity.At the lower surface place of steel plate, because allow to fall immediately, so such phenomenon can not take place with the cooling water that steel plate collides mutually.
Based on above-mentioned three kinds of mechanism, the temperature of each in four neighboring areas of cooled steel plate all is lower than the temperature of the centre of steel plate.
Therefore, even and then steel plate is being uniform in shape after finishing cooling, because the variation that steel billet temperature distributes, so in air cooling step subsequently, the heat in the middle of the high temperature steel plate reduces to be worth greater than each regional heat in four neighboring areas and reduces value.Therefore, in steel plate, can produce residual stress, therefore in steel plate, produce strain.Even without producing strain, stress also is retained in the place, edges of plate.When the user is cut into bar with steel plate, adversely produce the camber of bar (bar cur) from four neighboring areas of steel plate, it is called as " bar cutting camber ".In addition, four neighboring areas of steel plate are cooled to below the temperature of expection, so the material of steel plate changes, thereby adversely cause the problem that intensity for example improves.Correspondingly, the present invention has following two kinds of know-whies.
(1) before being right after the control cooling or in the starting stage of control cooling, makes along the uniformity of temperature profile of width upper steel plate.
(2) control cooling, so as on the width from the edges of plate to the steel plate in the middle of obtain identical cooling velocity.
Specifically describe these situations below with reference to Figure 4 and 5.Fig. 4 shows temperature curve, wherein make along the uniformity of temperature profile of width upper steel plate in the starting stage of control cooling, control cooling then equably, so as on the width from the edges of plate to the steel plate in the middle of obtain identical cooling velocity.In the present invention, in the starting stage of control cooling, regulate the water yield of passing through along the edge of width upper steel plate with curtain-shaped cover member.The place often controls cooling in the middle of steel plate.The temperature at place becomes and, cools off when identical along the temperature of width upper steel plate edge in the middle of the steel plate, so as on the width from the edges of plate to the steel plate in the middle of obtain equal cooling velocity.In such technology, equate along the edge of width upper steel plate and the cooling velocity at middle place, and also equate in the temperature when the edge of width upper steel plate and middle place stop to cool off, therefore produce the homogeneous material of steel plate on the width.Fig. 5 shows temperature curve, wherein makes along the uniformity of temperature profile of width upper steel plate with radiator cooler before the control cooling, controls cooling then, so that obtain identical cooling velocity from the edges of plate to the centre on width.In this case, in the control cooling, also equate, therefore obtained identical effect as shown in Figure 4 along the edge of width upper steel plate and the cooling velocity at middle place.
In the control cooling device,, carry out the nucleateboiling cooling in order to obtain identical cooling velocity along the width upper steel plate.As shown in Figure 1, when the surface temperature at the cooling light plate was reduced to temperature in the transition boiling zone, it is big that cooled variation in temperature distribution just becomes.Yet in the nucleateboiling zone, higher temperature produces higher cooling energy (higher heat flux).Therefore, even exist variation in temperature distribution before cooling, this variation also can diminish.As a result, just can reduce to cool off along the difference of the edge of width upper steel plate and middle energy.In the present invention, because the Temperature Distribution of steel plate is uniformly, in other words,, make after cooling, there is not variation in temperature distribution in principle so can cool off because in steel plate, there is not variation in temperature distribution.
In Fig. 2, following explanation is described top described: in the edge of the upper surface of steel plate, except the cooling water that sprays from the nozzle of the top that is arranged on steel plate, cool off with the cooling water that flows through the edges of plate.As a result, the cooling water inflow at the edge of the upper surface by steel plate increases, and has therefore increased cooling velocity.For fear of described problem, carry out the nucleateboiling cooling, the momentum of cooling water is very high in the nucleateboiling cooling.The water film of the cooling water with high momentum of discharging from nozzle by discharging arrives the surface of steel plate then, so can make the steam film breaks.Therefore, cooling is carried out in the nucleateboiling zone.In such cooling, the cooling water of discharging from nozzle is main, and is therefore very little by the influence of the cooling water of discharging along the edge of width upper steel plate.In order to use cooling water to carry out the nucleateboiling cooling, should adopt such technology:, increase the momentum of water by increasing the discharge pressure or the jet density of cooling water with high momentum.Alternatively, can use the cooling jet of the momentum that is used to increase water, for example slit spout cooling jet.
The example that is used for cooling jet of the present invention comprises injection nozzle, spray nozzle, ring pipe, slit laminar flow nozzle, ring pipe or slit spout cooling jet.When reducing the discharge pressure of the water yield and water, preferred employing can increase the ring pipe or the slit spout cooling jet of the momentum of water.
In addition, it is favourable using the nozzle of such momentum that can increase water, this be because: be used for cooling off along the energy at the edge of width upper steel plate be used for difference between the energy of centre of cooling metal sheets by covering with curtain-shaped cover member along the edge of width upper steel plate, can enlarging markedly.As a result, just can reduce in very short time along the edge of width upper steel plate and the temperature difference between the centre.Do not have vertical momentum by the water of discharging, therefore can not make the steam film breaks along the edge of width upper steel plate.Therefore, the based thin film boiling is cooled off.Promptly, thereby make it not by the injection of the high momentum cooling water of discharging from the above and below of steel plate by only covering along the edge of width upper steel plate, based on film boiling with low cooling energy, can cool off the steel plate edge on the width, and based on nucleateboiling with high cooling energy, centre that can cooling metal sheets.By this way, can increase at the energy that is used to cool off the steel plate edge on the width and be used for difference between the energy in the middle of the cooling metal sheets, therefore reduce variation in temperature distribution in steel plate.In addition, because do not make cooling in the transition boiling zone that the deviation of Temperature Distribution enlarges, so can be along the even cooling metal sheets of width.
In order to be implemented in the control cooling in the nucleateboiling zone, for example, when adopting the slot injection cooling, cooling water can be with 1,200L/minm 2Or higher jet density is discharged.More preferably, with 1,500L/minm 2Or the discharge of higher jet density, can more successfully obtain the nucleateboiling cooling.Consider that from facility cost and operating cost aspect jet density is preferably 3,000L/minm 2Perhaps littler.Term " slot injection cooling " meaning is meant by from being used to discharge the gap nozzle of cooling water, i.e. slit spout cooling jet, and the high-velocity flow of discharge cools off.In the slot injection cooling, the momentum of water and cooling velocity are quite high.The cooling device that comprises slit spout cooling jet is called " slot injection cooling unit ".
In a word, if make along the uniformity of temperature profile of width upper steel plate before the control cooling or in the starting stage of control cooling, the Temperature Distribution in control cooling back along the width upper steel plate also is uniform.In addition, in the control cooling, by using the cooling jet of the momentum that can increase water, cooling can be carried out in the nucleation zone, therefore obtains identical cooling velocity.
Above-mentioned principle not only can be applied to along the edge of width upper steel plate, but also can be applied to the top and the tail end of upper steel plate in a longitudinal direction.
To the present invention be described based on accompanying drawing below.
Fig. 6 is the conceptual scheme according to the device of the control cooling of embodiments of the invention steel plate.Transmission type control cooling device is as control cooling device 20.Transmission type control cooling device be a kind of be used for when transmitting steel plate cooling metal sheets device.Compare with fixed control cooling device, transmission type control cooling device has gratifying Controllable Temperature highly beneficially, and this is because can carry out Region control as described below.For example, in the device of fixed control cooling, when the temperature of steel plate arrives predetermined temperature, just stop the injection of cooling water.Yet in stopping, the response that stops valve existing delay.Therefore, it is difficult accurately controlling cool time.As shown in the figure, with the slab of slab roller mill 1 rolled plate, so that form steel plate 2 with predetermined thickness.Resulting steel plate is sent to the device 20 of control cooling with roller platform 3, and with predetermined cooling velocity it is cooled to uniform temperature when transmitting steel plate, stops cooling when this temperature.The device 20 of this control cooling comprises: at the upper header 21 above the line of passing through of steel plate 2; By the lower collector pipe 22 below the line; And be used to discharge water under high pressure and be connected to the slit spout cooling jet 23 and 24 on the lower collector pipe on these.The device 20 of control cooling has with the function that can come quick cooling metal sheets with the super-pressure discharge water that collide on the surface of steel plate 2.For before control cooling and measure the temperature of steel plate afterwards, thermometer 31 and 32 is arranged on the entrance side and the outlet side of the device 20 of control cooling.
Fig. 7 is the detailed view of the device 20 of control cooling.Control cooling device 20 comprises a plurality of cooled regions.This cooled region with distributing roller 27 separately.The cooling water inflow that uses in each zone can be regulated separately.This cooled region is called as " zone 1 ", " zone 2 " etc. from roller mill along order.Slit spout cooling jet can be with 1200L/minm 2Perhaps bigger jet density discharge water so that cause because the heat transmission of nucleateboiling, and makes it possible to cool off with identical cooling velocity along the whole width of steel plate.
The device 20 of control cooling comprises previous section 25 and aft section 26.In the previous section 25 of control cooling device, curtain-shaped cover member is arranged on each cooled region, therefore can regulate along the cooling water inflow at the edge of width upper steel plate.As shown in Figure 8, Fig. 8 is the profile that obtains along Fig. 7 center line A-A, a pair of upward curtain-shaped cover member 28 is arranged on the below of slit spout cooling jet 23, and be arranged on corresponding on the position of two edges of width upper steel plate, a pair of down curtain-shaped cover member 29 is arranged on down the top of slot injection cooling jet 24, and is arranged on corresponding on the position of two edges of width upper steel plate.Last curtain-shaped cover member 28 and following curtain-shaped cover member 29 move curtain-shaped cover member by being used for along the mechanism 16 that the width of steel plate 2 moves.Last coverage parts 28 and the following parts 29 of covering can move independently.For example, can only mobile upper-part or lower member.Alternatively, described upper-part and lower member can move simultaneously.The parts 28 of upward covering that are arranged on control cooling device 20 previous sections 25 can be mobile independently in each cooled region with the following parts 29 of covering.For example, cover parts and can be arranged on the only above and below of the edges of plate at a cooled region place.Alternatively, cover parts in front all cooled regions in the part be arranged on the above and below at steel plate edge.
According to first embodiment of the invention, in first step, in the cooled region that is limited in previous section along the cooling water inflow of two ends of width upper steel plate, make that the temperature at place equates in the middle of the temperature of the edge of width upper steel plate and steel plate in, cool off.Next, in second step, the whole width that is in steel plate of the cooled region in the part is controlled cooling with identical cooling velocity in the back.
In restriction along aspect the water yield of the EDGE CONTACT of width upper steel plate, for the quantity of determining shaded areas and the distance of coverage, about relevant before cooling the information along the edge of width upper steel plate, define as shown in Figure 9.It is distance zero the position that term " temperature reduce distance " is defined as along width from the edges of plate thermograde along the width upper steel plate.Term " temperature reduction amount " be defined as along the temperature of the edge of width upper steel plate and in the width upper steel plate thermograde be temperature difference between the temperature of zero position.
The variation that temperature reduction amount and temperature reduce distance depends on that for example, the thickness of raw material plate and heating situation rolling before are finished the rolling width of steel plate afterwards, the thickness of product, and finish temperature when rolling.In common rolling stock, in about 40-50 ℃ scope, reduce distance all in the scope of about 100-300mm along the temperature of each edge of width upper steel plate along the temperature reduction amount of each edge of width upper steel plate.According to the such parameter of thickness of material before for example rolling, can analyze temperature reduction amount of measuring along each edge of width upper steel plate and the temperature of measuring along each edge of width upper steel plate and reduce distance, thereby form form.Alternatively, can be provided for measuring the scanning thermometer of the Temperature Distribution on the whole surface of steel plate before the cooling device, handle measured value with computer then in control.
In the previous section of control cooling device, according to the information that obtains, common cooling will be stood in centre along the width upper steel plate, and as much as possible by using the cooling water inflow of curtain-shaped cover member restriction use, come the edge along the width upper steel plate is carried out the air cooling, make the temperature of each edge of the temperature in the middle of width upper steel plate place and steel plate equate.In first cooling step, be 20 ℃ or littler along the desired value of width upper steel plate variation in temperature distribution, preferably 10 ℃ or littler.
As shown in Figure 9, about the displacement of curtain-shaped cover member, can mobile curtain-shaped cover member, so that cover the part that reduces along the temperature of width upper steel plate edge.With reference to Figure 10, as described below, need to determine the quantity of the cooled region of curtain-shaped cover member.
(1) the following formula of use calculates the amount of cooling water Δ T in each zone:
ΔT＝DT/N，
Wherein, the total quantity of N representative cooled region in the previous section of controlling cooling device and aft section, the temperature difference (amount of cooling water) between the target temperature when target temperature during DT representative cooling beginning and cooling are finished.
(2) the quantity n of cooled region can determine from amount of cooling water Δ T in each zone and the formula below using, and can be cooled along the temperature reduction amount ED of the edge of width upper steel plate in the centre of cooling front spring in the quantity n of this cooled region:
n＝ED/ΔT
(3) 1 to regional n use curtain-shaped cover member from the zone, zone 1 is the first area in the previous section of control cooling device, and n is then determined by (2).
The quantity of the cooled region that calculates is integer always not.In this facility, can use curtain-shaped cover member or independent separately with descending curtain-shaped cover member to cover.Therefore, can on the basis in 0.5 zone, control cooling.For example, calculate when being 1.4, can in 1.5 zones, cool off when the quantity of cooled region.Specifically, 1 li in the zone, use curtain-shaped cover member up and down, 2 li in the zone, only use and go up curtain-shaped cover member.Here, the optimum on the machine length of using in each cooled region reduces that quantitative increase has improved along the Controllable Temperature of the edge of width upper steel plate with cooled region.
In addition, preferably, being exposed to cooling water by preventing the edge, is air cooled along the edge of width upper steel plate basically.Because along the temperature of each edge of width upper steel plate temperature near place in the middle of the steel plate, so that increase along the needed time of the uniformity of temperature profile of the centre of width upper steel plate and edge, therefore increased the quantity of the cooled region that needs curtain-shaped cover member.As a result, the amount of cooling water in the aft section of control cooling device reduces.Therefore, do not obtain effect of the present invention satisfactorily, do not obtain satisfactorily promptly that the cooling velocity at place equates such advantage in the middle of the cooling velocity of each edge of width upper steel plate and the steel plate.
Figure 11 shows when when cooling off as the above-mentioned technology of example of the present invention, the Temperature Distribution before and after the cooling in the width upper steel plate.The thickness of steel plate is 30mm, and width is 3,200mm, and length is 25m.When the temperature of the cooling of steel plate at place in the middle of the width upper steel plate is 750 ℃, and in the time of 550 ℃, finish.Before cooling, be 30 ℃ along the temperature reduction amount of each edge of width upper steel plate, reducing distance along the temperature of each edge of width upper steel plate is 200mm.The cooling device of Shi Yonging has above-mentioned structure in embodiments of the present invention, and the quantity of cooled region is 10.From the jet density of the top nozzle and the cooling water of following nozzle discharge all is 1,800L/minm 2According to said method, the quantity in the zone that needs curtain-shaped cover member of calculating is 1.5.At the 1 li use in zone curtain-shaped cover member up and down, in the zone 2 li only use under curtain-shaped cover member.About the displacement of curtain-shaped cover member, be 200mm because temperature reduces distance, so move each curtain-shaped cover member, make curtain-shaped cover member can cover from the edge to zone apart from the position of this edge 200mm.In this case, the temperature reduction amount along each edge of width upper steel plate is 30 ℃ before cooling.After cooling, temperature reduction amount is eliminated basically.In order to contrast, when having curtain-shaped cover member, do not cool off.After cooling, temperature reduction amount is 60 ℃.Variation in temperature distribution has increased in the width upper steel plate.
Cooled region in the part in the restriction cooling water inflow, cools off the top and the tail end of upper steel plate in a longitudinal direction in front, and the temperature at feasible upper steel plate top in a longitudinal direction and tail end place equals the temperature in the middle of the steel plate.Cooled region in the part cools off with identical cooling velocity along the whole longitudinal direction of steel plate in the back.
In this case, can use a kind of method that is similar to said method, be used for cooling off edge along the width upper steel plate.As shown in figure 12, for the top and the tail end of upper steel plate are in a longitudinal direction controlled cooling, in the control cooling device shown in Fig. 6 and 7, detect the pass through situation of the top of steel plate 2 with the unit 17 of for example taking pictures by the control cooled region.Set timer,, enter moment of above-mentioned independent cooled region, comprise that the flow controller 41 of flowmeter and flow control valve is started working at steel plate so that with respect to the passing through the time of the steel plate that detects with the unit 17 of taking pictures.As shown in figure 13, be used to control the method for flow rate, triple valve 42 be set in the previous section of controlling cooling device as another.By cooling water being guided to the outside, can end the cooling water of steel plate top and tail end.
Aspect the top of limiting upper steel plate in a longitudinal direction and the water yield that tail end contacts, for the quantity of determining shaded areas and the distance of covering, about about the information of the top of upper steel plate and tail end in a longitudinal direction before cooling, define as shown in figure 14.The temperature reduction amount at each place, end and temperature reduce the definition of distance in the top of steel plate and tail end, and be identical with the above definition along each edge of width upper steel plate shown in Fig. 9.Temperature reduction amount and temperature reduce distance and depend on, for example, the thickness of plate of material and heating situation rolling before are finished the rolling width of steel plate afterwards, the thickness of product, and the temperature during rolling finishing.In common rolling stock, the temperature reduction amount at each place, end is about 40-50 ℃ in the top of steel plate and tail end, and to reduce distance be about 300-500mm to the temperature at each place, end in the top of steel plate and tail end.According to the such parameter of the thickness of material rolling before for example, can analyze the temperature reduction amount at each place, end in the top of steel plate and tail end and in top and tail end the temperature at each place, end reduce distance, thereby the formation form.Alternatively, before the control cooling device, for example scanning thermometer or the such land surface pyrometer of set point temperature meter can be set, be used for measuring the Temperature Distribution on the whole surface of steel plate, can handle measured value with computer then.
In the previous section of control cooling device, according to the information that obtains, common cooling has been stood in the centre of upper steel plate in a longitudinal direction, as much as possible by using the cooling water inflow of curtain-shaped cover member restriction use, come the top and the tail end of upper steel plate are in a longitudinal direction carried out the air cooling, make that the temperature at each place, end equates in the top of the temperature at place in the middle of the steel plate and steel plate and the tail end.In this case, can use with when the principle similar principle of use during curtain-shaped cover member on the width of steel plate.For example, in order to compensate the temperature of the top end reduction of upper steel plate in a longitudinal direction, as shown in figure 15, timer can followingly be provided with: at first, each the cooling manifold place in control cooling device 20 ends cooling water (Figure 15 A).Border between the centre of the top of the temperature with reduction and steel plate enters the moment of each cooled region, flow controller 41 work, thus discharge cooling water (Figure 15 B).
In order to compensate the temperature of the tail end place reduction of upper steel plate in a longitudinal direction, as shown in figure 16, timer can followingly be provided with: at first, each the cooling manifold place in control cooling device device 20 discharges cooling water (Figure 16 A).On in a longitudinal direction, have border between the centre of the tail end of temperature of reduction and steel plate and enter moment of each cooled region, flow controller 41 work, thus end cooling water (Figure 16 B).
The quantity of the cooled region of flow controller 41 work therein can with determine along the identical mode of the control technology of width upper steel plate, as described below:
(1) the following formula of use calculates the amount of cooling water Δ T in each zone:
ΔT＝DT/N，
Wherein, the total quantity of N representative cooled region in the previous section of controlling cooling device and aft section, the temperature difference (amount of cooling water) between the target temperature when target temperature during DT representative cooling beginning and cooling are finished.
(2) the quantity nL of cooled region can determine from amount of cooling water Δ T in each zone and the formula below using, in the quantity nL of this cooled region before cooling can the be cooled temperature reduction amount EDL at top or tail end place of steel plate of the centre of upper steel plate in a longitudinal direction:
nL＝EDL/ΔT
(3) 1 to regional nL use and cover member from the zone, zone 1 is the first area in the previous section of control cooling device, and nL is then determined by (2).
The quantity of the cooled region that calculates is integer always not.For example, calculate when being 1.4, use zone, just, use 1 zone near integer when the quantity of cooled region.This point is different with control situation along the width upper steel plate.For example, if cooling water only is discharged on the upper surface of steel plate, because the temperature difference between upper and lower surface can produce warpage.Because it is very difficult correcting warpage with roller finisher or similar devices in correction step subsequently, do not wish to take place so go up the warpage at top and tail end place in a longitudinal direction.Similarly, as in the situation on the width of steel plate, on the longitudinal direction of steel plate, the optimum on the length of the machine that uses in each cooled region reduces with cooled region quantitative increase and has improved the top of upper steel plate and the Controllable Temperature at tail end place in a longitudinal direction.In addition, preferably, be exposed under the cooling water by preventing top and tail end, the top of upper steel plate and tail end are air cooled basically in a longitudinal direction.As controlling situation at the steel plate on width, because along the temperature of the edge of width upper steel plate temperature near place in the middle of the steel plate, so that in a longitudinal direction the needed time of the uniformity of temperature profile at the middle place of upper steel plate and top and tail end place increase, therefore increased the quantity of carrying out the cooled region of flow-control.As a result, the amount of cooling water in the aft section of control cooling device reduces.Therefore, do not obtain effect of the present invention satisfactorily, the cooling velocity that does not promptly obtain satisfactorily to locate in the middle of the cooling velocity at each place, end in the top of upper steel plate in a longitudinal direction and the tail end and the upper steel plate in a longitudinal direction equates such advantage.
With with along the identical mode in the edge of width upper steel plate, can cool off control to the top and the tail end of the reduction temperature of aforesaid upper steel plate in a longitudinal direction.Therefore, can be cooled off equably along whole longitudinal direction steel plate.
This technology is favourable, this be because: need the quantity in the zone of curtain-shaped cover member to reduce to eliminate along the temperature of width upper steel plate by control, and the quantity of the cooled region of the flow rate of the water at each place, end can control along the cooling of width upper steel plate and the top of upper steel plate and the cooling of tail end in a longitudinal direction independently to eliminate the temperature reduction at each place, end of going up in a longitudinal direction in top and the tail end in top by controlling upper steel plate in a longitudinal direction and the tail end.Therefore, even when the temperature reduction amount at the temperature reduction amount of each edge and each place, end in top and tail end be different (for example, temperature reduction amount along each edge of width upper steel plate is 30 ℃, the temperature reduction amount at the top of upper steel plate and tail end place is 70 ℃ in a longitudinal direction), also can make Temperature Distribution become even.
Figure 17 is the conceptual scheme that is used for the control cooling device of cooling metal sheets according to second embodiment of the invention.With roller platform 3 hot rolled steel plate 2 transmission are entered radiator cooler 10, enter control cooling device 20 then, and be cooled to cool off the temperature that stops with predetermined cooling velocity.
Radiator cooler 10 is arranged on control cooling device 20 before so that obtain the cooling device of first cooling step of the present invention.Radiator cooler 10 can have temperature is reduced at least approximately 40-50 ℃ ability, and this is the temperature reduction amount along width upper steel plate edge.Radiator cooler 10 comprises: at the upper header 11 above the line of passing through of steel plate 2, and by the lower collector pipe 12 below the line, and the nozzle that is connected to these collectors.The current 13 of discharging from nozzle can collide with the upper and lower surface of steel plate 2 mutually with 14, thereby obtain the laminar flow cooling.Term " laminar flow cooling " meaning is meant that above-mentioned laminar flow is producing under the current at a slow speed by using laminar flow to produce a kind of method that the water film comes cooling metal sheets on the surface of steel plate.The cooling velocity that is obtained by the laminar flow cooling is quite low.Use the cooling device of laminar flow cooling to be called as " laminar flow cooling unit ".
As the situation in the first embodiment of the present invention, this control cooling device 20 comprises: at the upper header 21 above the line of passing through of steel plate 2, by the lower collector pipe 22 below the line, and be connected on these on lower collector pipe and be used for discharging the slit spout cooling jet 23 and 24 of water under high pressure.Control cooling device 20 has with the function that can come quick cooling metal sheets with the super-pressure discharge water that collide on the surface of steel plate 2.In addition, as shown in Figure 7, control cooling device 20 comprises a plurality of cooled regions.Separate the cooled region (not shown) with distributing roller 27.Can be adjusted in the amount of the cooling water that uses in each zone separately.Cooled region is called as " zone 1 ", " zone 2 " etc. from roller mill along order.Can be with 1200L/minm 2Perhaps bigger jet density is discharged cooling water, so that cause the heat transmission owing to nucleateboiling, and makes it possible to cool off with identical cooling velocity along the whole width of steel plate.
In order to measure the temperature of the steel plate before and after cooling off, thermometer 30,31 and 32 is arranged on the entrance side of radiator cooler 10 and the entrance side and the outlet side of control cooling device 20.
In the second embodiment of the present invention, comprise the radiator cooler 10 of laminar flow unit and comprise that the control cooling device 20 of the slot injection cooling unit with slit spout cooling jet uses together.In the radiator cooler that comprises the laminar flow unit, control is along the amount of the cooling water of the top of the edge of width upper steel plate 2 and steel plate and tail end.
As shown in figure 18, Figure 18 is the cutaway view that obtains along Figure 17 center line A-A, a pair of curtain-shaped cover member 15 be arranged on upper header 11 belows, lower collector pipe 12 the top and corresponding in radiator cooler 10 along the position at two edges of width upper steel plate.Come mobile curtain-shaped cover member 15 by the mechanism 16 that is used for moving curtain-shaped cover member, so that control is along the cooling water inflow of width upper steel plate along the width of steel plate 2.
In second embodiment of the invention, replace the function of the previous section of control cooling device in first embodiment with radiator cooler 10.In radiator cooler 10, along the whole longitudinal direction of this device curtain-shaped cover member is set, therefore guarantee along the uniformity of width upper steel plate Temperature Distribution.Therefore, in control cooling device 20, from along the edge of width upper steel plate to centre along the width upper steel plate, cool off with identical cooling velocity.As described in the first embodiment of the invention, it is about 40-50 ℃ along the temperature reduction amount of each edge of width upper steel plate.Therefore, in order to make, should to be cooled 40-50 ℃ along the centre of width upper steel plate, and not cool off along the edge of width upper steel plate along the uniformity of temperature profile of width upper steel plate.The target amount of cooling water is very little.Therefore, cooling velocity reduces, and to carry out the cooling of long duration, therefore causes carrying out easily high-precision control.Therefore, in the second embodiment of the present invention, along the uniformity of the Temperature Distribution of width upper steel plate than the height in first embodiment.In this technology, the facility that can reduce the about 40-50 of steel billet temperature ℃ can be arranged on before the control cooling device.Therefore, described facility can be installed with low cost.On control method, identical with mode among first embodiment, can use curtain-shaped cover member at the cooled region place of the previous section of radiator cooler.Alternatively, curtain-shaped cover member can use all cooled regions in cooling device.When as the former when the previous section of radiator cooler is used curtain-shaped cover member, at the edge of the aft section cooling metal sheets of radiator cooler.Temperature when therefore, the control cooling begins is lower than the latter's temperature.Therefore, preferably, as the latter,, cool off with the steel plate transfer rate of regulating then curtain-shaped cover member use all cooled regions in cooling device.
Contact aspect the water yield of making the steel plate edge in limit,, in the auxiliary information of cooling off the edge of front spring, in first embodiment, define as shown in Figure 9 about relevant in order to determine cool time and to cover distance.As the situation described in first embodiment, the variation that temperature reduction amount and temperature reduce distance depends on, for example, the thickness and the heating situation of plate of material before rolling, finish the width of rolling back steel plate, the thickness of product, and the temperature during rolling finishing.Therefore, can measure its measured value, thereby form form.Alternatively, before the control cooling device, for example land surface pyrometer of scanning thermometer can be set, be used for measuring the Temperature Distribution on the whole surface of steel plate, handle measured value with computer then.
In radiator cooler, according to the information that obtains, stand common cooling along the centre of width upper steel plate, as much as possible by using the cooling water inflow of curtain-shaped cover member restriction use, come the edge along the width upper steel plate is carried out the air cooling, make the temperature of each edge of the temperature in the middle of width upper steel plate place and steel plate equate.About the displacement of curtain-shaped cover member, as shown in Figure 9, can mobile curtain-shaped cover member, so that cover the part that reduces along the temperature at width upper steel plate edge.Make the temperature of steel plate reduce to measure needed cool time with radiator cooler 10 and calculated, then, determine the transfer rate of steel plate by the length of cool time and facility along the temperature reduction of each edge of width upper steel plate.This calculating is easier than the calculating among first embodiment.In addition, this embodiment is different from the first embodiment part and is: the control cooling is not based on 0.5 zone.Therefore that is, can be controlled continuously cool time, improved the uniformity of steel plate Temperature Distribution on the width.
In radiator cooler, the jet density of cooling water is preferably at 100-500L/minm 2Scope in.As mentioned above, at the device that is used for addressing the above problem,, should prevent because the sub-cooled that the strain that produces along the edge of width upper steel plate causes for the whole width along steel plate cools off with uniform cooling velocity.Therefore, (more specifically, use has 1,200L/minm preferably to adopt the cooling means with high momentum water 2The slit spout cooling jet of perhaps bigger jet density).In this radiator cooler, on width, from the edges of plate to the centre, can not obtain identical cooling velocity.Yet the temperature reduction amount in each edge of steel plate on the width is very little (40-50 ℃), under the high temperature that material is not determined, can make the steel billet temperature before the control cooling even along whole width; Therefore, as shown in Figure 1, be applied in the hot transmitting characteristic in the film boiling zone, when low flow velocity and high surface temperature, have the film boiling zone.Before cooling, exist in the width upper steel plate under the situation that Temperature Distribution changes, as shown in Figure 1 in the transition boiling zone, steel plate produce higher cooling energy (heat flux) than low surface temperature.Therefore, in low-temperature region, for example along the edge of width upper steel plate, before cooling, cooling energy (heat flux) increases with the speed of accelerating.On the other hand, in the film boiling zone, higher temperature produces higher cooling energy (heat flux); Therefore, the variation in temperature distribution along the width upper steel plate does not increase.Therefore, in radiator cooler, when control cooling makes that the cooling of based thin film boiling is held, can prevent because in the sub-cooled of the edges of plate that the variation of fluidized state causes.Therefore, owing to the only sub-cooled that causes by the water yield that increases in edges of plate place's draining should be considered.Therefore, can make with comparalive ease along the uniformity of temperature profile of width upper steel plate.In addition, in film boiling, because cooling energy (heat flux) is lower, it has can successfully control the advantage that temperature reduces 20-30 ℃, and this is the temperature reduction amount of edges of plate.In order to realize this point, the jet density of the cooling water in radiator cooler 10 is the L/minm at 100-500 2In the scope, thereby obtained stable film boiling.In addition, in order to realize film boiling, stable steam film need appear between steel plate and cooling water.Therefore, preferably adopt the wherein lower cooling means of momentum of water, for example spray the cooling of cooling or laminar flow.
On the other hand, with first embodiment in identical mode, by cutting off, regulate the top of steel plate and the cooling water inflow of tail end by the top of upper steel plate and the current of tail end in a longitudinal direction.Specifically, as shown in figure 19, the upper header 11 in cooling facility for laminar flow 10 is divided into four part: 11a-11d (in Figure 19).The situation of passing through by cooling facility for laminar flow 10 is gone up on the top of detecting steel plate 2 with the unit 17 of taking pictures in a longitudinal direction.Set timer T1-T4, make upper header partial reference separately start working with the time of passing through of the unit 17 detected steel plates of taking pictures.Then, as shown in figure 19, upper header 11 responds the advancing the stage of steel plate and works, thereby has improved the cooling on the top of upper steel plate in a longitudinal direction.The moment control aspect that is discharged from about cooling water, temperature based on the top of upper steel plate in a longitudinal direction reduces distance, can be carrying out as control identical among first embodiment with mode identical in first embodiment, described temperature reduces that distance is determined in advance or measures before auxiliary the cooling.In a similar fashion, as shown in figure 20, can regulate the cooling water inflow of the tail end of upper steel plate in a longitudinal direction.
By this way, by with method identical in first embodiment of the invention, can carry out the top of upper steel plate in a longitudinal direction and the cooling control of tail end.
On the other hand, cut off the top of upper steel plate and the cooling water at tail end place in a longitudinal direction, with use curtain-shaped cover member to limit so that only cool off mid portion on the width, not difference in itself along the cooling water inflow at the edge of width upper steel plate.When along the temperature reduction amount of width upper steel plate with when the temperature reduction amount of each end equates in the top of upper steel plate and the tail end in a longitudinal direction, can make uniformity of temperature profile along the whole surface of steel plate.Yet, in a second embodiment, when cooling water inflow along whole radiator cooler restriction along the edge of width upper steel plate, because can not independently control to the cooling on the width of steel plate with to the cooling on the longitudinal direction of steel plate, so can make along the uniformity of temperature profile of width upper steel plate, perhaps can make the top of steel plate and the uniformity of temperature profile of tail end.
Be used to make uniformity of temperature profile to make the example of the method for the uniformity of temperature profile that goes up in a longitudinal direction comprise a kind of technology again simultaneously along the width upper steel plate, in this technology, with with first embodiment in identical mode, a plurality of cooled regions are arranged in the radiator cooler, then, in the previous section of radiator cooler, control is along the cooling water inflow at width upper steel plate edge; Also comprise a kind of technology, in this technology, make along the uniformity of temperature profile of width upper steel plate, then with radiator cooler, in control cooling device subsequently, to the top and the tail end of upper steel plate are controlled cooling as described in the first embodiment in a longitudinal direction.A kind of technology in back is preferred.Before a kind of shortcoming of technology be: make to be regulated continuously cool time because of the control of carrying out based on the quantity of the cooled region in the radiator cooler, thus obtain unsatisfactorily to have high-precision on the width uniformity of Temperature Distribution.In addition, in radiator cooler, make in the process of the uniformity of temperature profile on the longitudinal direction of steel plate, for example, when the temperature reduction amount at the top of steel plate and place, each end in the tail end greater than along the temperature reduction amount of each edge of width upper steel plate the time, must cool off corresponding to each end in top and the tail end with the centre of longitudinal direction upper steel plate on width, be big on top and tail end temperature reduction amount wherein.Therefore, must control cooling from the low temperature of comparing with the situation of uniformity of temperature profile on the width of steel plate.Yet from the position of material, the control cooling is preferably carried out from higher temperature.When control cooling when low temperature carries out, can the ferritic transformation of generation before the control cooling, thus reduce the quenching performance in some cases.In addition, frequent situation is, is important along the uniformity of temperature profile of width upper steel plate edge.Therefore, as a kind of technology in back, preferred adopt a kind of like this technology, it comprises: make the uniformity of temperature profile on the width in auxiliary cooling, and make the uniformity of temperature profile on the longitudinal direction of steel plate in the control cooling.
Described above according to the technology of first embodiment with according to the technology of second embodiment.According to production line that will use and properties of product, can carry out at least a technology of from above technology, selecting.For example, in the time can not assisting cooling in the starting stage of cooling, perhaps when not having the space that radiator cooler is installed, can adopt technology according to first embodiment from the position of material.When comparing with the uniformity of the material of upper steel plate in a longitudinal direction, obtained along the material of width upper steel plate than high uniformity the time, perhaps when radiator cooler and control cooling device are installed in series, can adopt technology according to second embodiment.
In addition, in first embodiment, finisher 60 can be arranged on before the control cooling device 20.In a second embodiment, as shown in figure 21, finisher 60 can be arranged between radiator cooler 10 and the control cooling device 20.When steel plate had relatively poor flatness before cooling, because the position of steel plate is depended in the variation of the distance between steel plate and the nozzle, it is poorer a little that temperature homogeneity may become.By before the control cooling, offseting steel plate, can control cooling more equably.In addition, finisher 60 can be arranged on the conveyor side of control cooling device 20.
The curtain-shaped cover member of Shi Yonging can have any structure in the present invention, and for example barrier type, template or the rill type is arranged are as long as curtain-shaped cover member can prevent to be exposed to from just can under water that nozzle is discharged along each edge of width upper steel plate.Yet preferably, curtain-shaped cover member is made by etch-proof material, and has the structure of high rigidity, and this is because water under high pressure always collides mutually with curtain-shaped cover member.Produce easily and its maneuvering performance from curtain-shaped cover member, curtain-shaped cover member preferably adopts the form of plate.When using such shield, preferably, the maximum temperature that the size of shield will be longer than a little in each edge of steel plate reduces distance.Under the situation that is shorter in length than described distance of shield, if reduce the length of distance greater than shield in the temperature of each edge of steel plate, shield just can not cover the edge fully so.In contrast, under the excessively long situation of the length of shield, the mechanism that is used for mobile shield becomes undue big, therefore causes being difficult in the narrow space of for example controlling in the cooling device shield is installed.As mentioned above, be about 300mm because the common temperature of each edge of steel plate reduces apart from maximum, so the length of shield should be set in about 350-400mm.Because the cooling water that uses often contains for example corrosive substance of chlorine, comprise anticorrosive so be used to cover the preferred embodiment of the material of plate, for example stainless steel, erosion shield steel plate and be coated with the carbon steel plate of zinc, chromium or similar material on production line.
Example
Table 1 shows the working condition of controlling cooling according to the present invention and controlling cooling according to existing method (comparison example).Table 2 shows the contrast between above two kinds of method effects.The steel plate situation of handling is described below: the thickness of steel plate is 25mm, and width is 3,800mm, and the length of use is 25m.The control cooling is 750 ℃ of beginnings from the temperature in the middle of the width upper steel plate, and 550 ℃ of end.The intensity of steel plate is the 490MPa rank.Its permissible range is 490-610MPa.Before cooling, in Fig. 9, be 30 ℃ along the temperature reduction amount of each edge of width upper steel plate, reducing distance along the temperature of each edge of width upper steel plate is 200mm.In Figure 14, the temperature reduction amount at each place, end is 50 ℃ in the top of upper steel plate and the tail end in a longitudinal direction, and the temperature reduction distance at each place, end is 500mm in the top of upper steel plate and the tail end in a longitudinal direction.In creative example 1 and 2, shown in Figure 25 and 26, the curtain-shaped cover member (hereinafter referred to as " shield ") that uses in the control cooling device is the steel plate that is coated with zinc-nickel (Zn-Ni-plated).At each cooled region, four shields are arranged on left side, right side, top side and the bottom side of steel plate.The length that each coverage plate has is 300mm, and width is 350mm, and thickness is 7mm.Each is covered plate and is arranged to from the horizontal by 15 °, and the feasible cooling water that stops with shield can not fallen on the steel plate again.In creative example 3 and 4, the coverage plate that uses in radiator cooler is the L shaped steel plate that is coated with zinc-nickel (Zn-Ni-plated), makes curtain-shaped cover member can stop that cooling water crosses the whole length (10m) of radiator cooler.The length that each curtain-shaped cover member has is 10m, and width is 350mm, and thickness is 7mm, highly is 50mm.Four shields are arranged on left side, right side, top side and the bottom side of steel plate.In radiator cooler, because curtain-shaped cover member is very long, so can take place because the warpage that himself weight causes.In order to ensure the rigidity of curtain-shaped cover member, as shown in figure 27, curtain-shaped cover member is processed to L shaped, and the connection spacing between the rib is 500mm.As shown in figure 28, curtain-shaped cover member is arranged to, and makes inwardly to be provided with along width along each plate portion of vertical direction.Therefore, the cooling water that stops with curtain-shaped cover member can not fallen on the steel plate.
Creative example 1 is the example corresponding to first embodiment.With cooling off as the described device of Fig. 6-8.To describe the control situation in detail according to Fig. 7.The quantity of cooled region is 15, and each regional length is 1.0m, and the length of The whole control cooling device is 15m.In each zone, cooling water is with 1,500L/minm 2Jet density discharge.In this case, cooling velocity is about 30 ℃/s.Cooling is since 750 ℃, to 550 ℃ of end.Therefore, each regional amount of cooling water is (750 ℃-550 ℃)/15 zone=13.3 ℃.Therefore, the quantity in the zone of the curtain-shaped cover member that need use in the edge along the width upper steel plate is 30 ℃/13.3 ℃=2.26 zones.In fact, the region quantity of use is 2.5.In zone 1 and zone 2, use curtain-shaped cover member up and down.At regional 3 li, only use curtain-shaped cover member down.About covering the displacement of member be 200mm because temperature reduces distance, so displacement be set at so that curtain-shaped cover member can prevent from the edge to be that zone the position of 200mm is exposed under the cooling water apart from this edge.On the other hand, be adjusted in the top of upper steel plate and the flow velocity at each place, end in the tail end in a longitudinal direction with as shown in figure 12 flow controller.The temperature reduction amount at each place, end all is 50 ℃ in the top of upper steel plate and the tail end in a longitudinal direction, and the region quantity that needs is 50 ℃/13.3 ℃=3.8.Therefore, regulate to zone 4 from zone 1.On the top of upper steel plate in a longitudinal direction, as shown in figure 15, at first, cooling water is not discharged, shown in Figure 15 A.Shown in Figure 15 B, when steel plate in a longitudinal direction the top end of upper steel plate enter cooling device to temperature reduce apart from the time, cooling water is discharged.As shown in figure 16, the control of the flow velocity of the tail end of upper steel plate is in a longitudinal direction also carried out in a similar fashion.Cooling velocity with the control cooling device is about 30 ℃/s.Be (750 ℃-550 ℃)/30 ℃/s=6.6sec (second) cool time that is used to control the cooling needs.Therefore, the transfer rate at control cooling device light plate is (15m/6.6sec) * 60=134mpm.
Creative example 2 is another examples corresponding to first embodiment.The jet density of cooling water is set at 1,200L/minm 2Condition except the jet density of cooling water is identical with creative example 1 all.
Creative example 3 is the examples corresponding to second embodiment.Use device as describing in Figure 17.Cool off with radiator cooler 10, make to become even along the variation in temperature distribution of width upper steel plate.Then, cool off with control cooling device 20, the feasible top of upper steel plate in a longitudinal direction and the variation in temperature distribution of tail end become even.The length that radiator cooler 10 as shown in figure 17 has is 10m, and can be with 100L/minm 2Jet density discharge cooling water.In this case, cooling velocity is about 4 ℃/s.In the temperature along each edge of width upper steel plate is 720 ℃.Therefore, will be cooled to 720 ℃ of needed times from 750 ℃ along the centre of width upper steel plate is (750 ℃-720 ℃)/4 ℃=7.5sec.Therefore, in radiator cooler 10, the transfer rate of steel plate is (10m/7.5sec) * 60=80mpm.In addition, shown in Figure 19 and 20, all enter radiator cooler in the top of upper steel plate in a longitudinal direction and each end in the tail end and reduce distance (500mm) afterwards to the top of upper steel plate and the temperature of each end in the tail end in a longitudinal direction, cooling water discharges in order.About the displacement of curtain-shaped cover member, be 200mm because temperature reduces distance, so displacement is set at, make curtain-shaped cover member spare can prevent on the width from the edge to being exposed under the cooling water apart from the zone the position of this edge 200mm.
In control cooling device as shown in figure 17, as the situation 1 li of creative example, the quantity of cooled region is 15 zones.Each regional machine length is 1.0m.The whole length of control cooling device is 15m.In each zone, cooling water is with 1,500L/minm 2Jet density discharge.In this case, cooling velocity is 30 ℃/s.In control cooling device 20, cool off 720 ℃ of beginnings, and 550 ℃ of end.Each regional amount of cooling water is (720 ℃-550 ℃)/15 zone=11.3 ℃.About the top of upper steel plate and the adjusting of the flow velocity that each end in the tail end is located in a longitudinal direction, the temperature reduction amount at the top of upper steel plate and each place, end in the tail end is 50 ℃ in a longitudinal direction.By having eliminated 30 ℃, need the control cooling device to be controlled at the top of upper steel plate and the temperature reduction amount (20 ℃) at each place, end in the tail end in a longitudinal direction with the radiator cooler variation in temperature distribution.Therefore, the region quantity of Xu Yaoing is 20 ℃/11.3 ℃=1.8 zones.Therefore, carrying out flow velocity at regional 1 and 2 li regulates.On the top of upper steel plate in a longitudinal direction, as shown in figure 15, at first, cooling water is not discharged, shown in Figure 15 A.Shown in Figure 15 B,, discharge cooling water when steel plate when the top end of upper steel plate enters cooling device and reduces distance (500mm) to temperature in a longitudinal direction.As shown in figure 16, the control of the tail end of upper steel plate is in a longitudinal direction also carried out in a similar fashion.Cooling velocity with the control cooling device is about 30 ℃/s.It is (720 ℃-550 ℃)/30 ℃/s=5.7sec that needed cool time is cooled off in control.Therefore, controlling cooling period, the transfer rate of steel plate is (15m/5.7sec) * 60=158mpm.To the top of upper steel plate and the flow velocity adjusting of tail end are to be carried out by flow controller as shown in figure 12 in a longitudinal direction.
Creative example 4 is such examples: between radiator cooler and control cooling device finisher is set in wherein in second embodiment.Its cooling situation and creative example 3 identical.
In comparison example 1, use and cool off with identical facility in creative example 1.The transfer rate of steel plate is identical with in creative example 1 also.Do not have to be used to control along the curtain-shaped cover member of the temperature of the edge of width upper steel plate, and be not used to regulate the top of upper steel plate and the flow-control of tail end place temperature in a longitudinal direction.
In comparison example 2, use and cool off at 2 li identical facilities of creative example.In radiator cooler with the transfer rate of control cooling device light plate identical with in creative example 2.Do not have to be used to control along the curtain-shaped cover member spare of the temperature of the edge of width upper steel plate, and be not used to regulate the top of upper steel plate and the flow-control of tail end place temperature in a longitudinal direction.
In comparison example 3, use with at 2 li identical facilities of creative example.Use radiator cooler to cool off separately.Do not carry out along the edge of width upper steel plate and the top of upper steel plate and the flow-control of tail end in a longitudinal direction.In this example, the length that radiator cooler 10 as shown in figure 17 has is 10m.Cooling water is with 500L/minm 2Jet density discharge.In this case, cooling velocity is 14 ℃/s.It is 14.3sec that steel plate is cooled to 550 ℃ of needed cool times from 750 ℃.Therefore, in radiator cooler, the transfer rate of steel plate is 42mpm.In this example, the water yield is than big in the water yield of 3 li of creative examples, so that increase cooling velocity.This is because only determine described material with radiator cooler.Therefore, set higher slightly cooling velocity.In this case, do not carry out the top of upper steel plate and the flow-control of tail end in a longitudinal direction, and do not use the curtain-shaped cover member on the width of steel plate.
In comparison example 4, use with at 3 li identical facilities of creative example.Only use radiator cooler to cool off as 3 li of creative examples.Carry out along the edge of width upper steel plate and the top of upper steel plate and the flow-control of tail end in a longitudinal direction.In this example, identical in the transfer rate of steel plate and the comparison example 3.When cooling was carried out, the jet density of cooling water was identical with 3 li of comparison example.About the displacement of curtain-shaped cover member, be 200mm because temperature reduces distance, so displacement is set at, make curtain-shaped cover member can prevent from the edge to being exposed under the cooling water apart from the zone the position of this edge 200mm.Shown in Figure 19 and 20, all enter radiator cooler in the top of upper steel plate in a longitudinal direction and each end in the tail end and reduce distance (500mm) afterwards to the top of upper steel plate and the temperature of each end in the tail end in a longitudinal direction, cooling water discharges in order.
In comparison example 5, use and 1 li identical facility of creative example.In all cooled regions, along the edge of width upper steel plate with the top and the tail end of upper steel plate carry out flow-control in a longitudinal direction.In this example, when cooling off, identical in the transfer rate of steel plate and the creative example 1, and the jet density of cooling water also with creative example 1 in identical.In all cooled regions, use curtain-shaped cover member.In all cooled regions, the top of upper steel plate and tail end carry out flow-control in a longitudinal direction.
About the displacement of curtain-shaped cover member, be 200mm because temperature reduces distance, so displacement is set at, making in all cooled regions curtain-shaped cover member can prevent from the edge is that zone the position of 200mm is exposed under the cooling water apart from this edge.On the top of upper steel plate in a longitudinal direction, as shown in figure 15, at first, cooling water is not discharged, shown in Figure 15 A.Shown in Figure 15 B, when steel plate when the top end of upper steel plate enters cooling device and reduces distance (500mm) to temperature in a longitudinal direction, cooling water is discharged.As shown in figure 16, the control of the tail end of upper steel plate is in a longitudinal direction also carried out in a similar fashion.
Edge about along the width upper steel plate defines as shown in Figure 9.It is distance zero the position to thermograde along the width upper steel plate that term " temperature reduce distance " is defined as from the edge along the width upper steel plate.Term " temperature reduction amount " be defined as along the temperature of the edge of width upper steel plate and in the width upper steel plate thermograde be temperature difference between the temperature of zero position.Therefore, when the temperature along the edge of width upper steel plate be lower than steel plate in the middle of during the temperature at place, temperature reduction amount be on the occasion of.When the temperature along the edge of width upper steel plate be higher than steel plate in the middle of during the temperature at place, temperature reduction amount is a negative value.About the end of upper steel plate in a longitudinal direction, define as shown in figure 14.This definition is with identical apart from the definition of being done with the temperature reduction to the temperature reduction amount on the width of steel plate.
Figure 22 shows the position that is used for cutting steel plate after the cooling.The distance in a longitudinal direction the top and the tail end of upper steel plate be the position of 150mm, cut out the top sample 51 and the tail end sample 54 of steel plate respectively.From on width and the centre of longitudinal direction upper steel plate cut out intermediate sample 53.In these samples, cut out test block, and measure tensile strength.About the intensity in each edge of steel plate, in the position of distance steel plate edge 100mm, the intermediate sample that cutting cuts out from the centre along width and longitudinal direction upper steel plate forming test block, and is measured tensile strength.
Shown in Figure 23 and 24, the sample 55 that is used to measure the sample 52 of the camber of cutting bar on the steel plate width direction and is used to measure the camber of cutting bar on the longitudinal direction of the top of steel plate and tail end all is cut into rectangular shape.Figure 23 shows the position that is used to cut out the sample that is used to measure the camber of cutting bar on the width of steel plate, and the position that is used to measure above-mentioned camber.The position that in the distance edges of plate is 300mm cuts out sample.The crooked maximum of the rectangle sample that is obtained is defined as the camber of cutting bar on the width.Figure 24 shows the position that is used to cut out the sample that is used to measure the camber of cutting bar on the longitudinal direction of steel plate, and the position that is used to measure camber.Distance in a longitudinal direction the tail end of upper steel plate be that the position of 300mm cuts out sample.The crooked maximum of the rectangle sample that is obtained is defined as the camber that the cutting bar is gone up in a longitudinal direction.
As shown in table 2, when application is of the present invention,, to compare with the temperature reduction amount (30 ℃) before the cooling although cooling velocity is very high on the whole, the temperature reduction amount (4 ℃ to 3 ℃) along width upper steel plate edge after cooling has reduced.In addition, compare with the temperature reduction amount (50 ℃) before the cooling, the temperature reduction amount at upper steel plate top and tail end place (7 ℃ to 10 ℃) has also reduced in a longitudinal direction.As a result, the residual stress on the width of steel plate has reduced, and the camber after the bar cutting is very little.At the top and the tail end place of upper steel plate in a longitudinal direction, in edge along the width upper steel plate, and in the middle of width and the longitudinal direction upper steel plate place, the tensile strength of steel plate is about 550MPa, and is stable.In creative example 4, after auxiliary cooling, offset, control cooling then.With comparing in the creative example 1 and 2, the shape of above-mentioned steel plate is smooth significantly before cooling.As a result, improved the uniformity of the Temperature Distribution that obtains by the control cooling.Therefore, reduced along the edge of width upper steel plate and the top of upper steel plate and the temperature reduction amount at tail end place in a longitudinal direction.Further reduced the camber after bar cuts.
In contrast, in comparison example 1-3, along the edge of width upper steel plate with the top and the tail end of upper steel plate do not carry out the flow-control of water in a longitudinal direction.As a result, and compare before the cooling, after the cooling on the width of steel plate and in a longitudinal direction the temperature reduction amount of the top of upper steel plate and tail end increase, thereby produce big camber in bar cutting back.In addition, compare, along the edge of width upper steel plate and the tensile strength increase at the top of upper steel plate and tail end place in a longitudinal direction with place in the middle of the steel plate.In some cases, tensile strength has surpassed the upper limit of allowing maximum magnitude.
Comparison example 4 and 5 li, along the edge of width upper steel plate and in a longitudinal direction the top of upper steel plate and the water of tail end carry out flow-control, but it is not the method according to this invention.As a result, with comparing of place in the middle of width and longitudinal direction upper steel plate, the top of upper steel plate and tail end and become very high in a longitudinal direction after cooling along the temperature of the edge of width upper steel plate.Therefore, compare, along the edge of width upper steel plate with the tensile strength at the top of upper steel plate and tail end place is very little in a longitudinal direction with place in the middle of width and longitudinal direction upper steel plate.In some cases, tensile strength is lower than the upper limit of maximum magnitude.In addition, with comparing among the comparison example 1-3, improved the camber of cutting bar, but above-mentioned camber is greater than the camber in creative example 1-3.
Industrial applicibility
According to the present invention, in the control cooling of finishing rolling back steel plate, distribute along the uniform temperature that can obtain on surface of steel plate on the whole width of steel plate and the longitudinal direction.Carry out the control of steel plate is cooled off with high cooling velocity generally.As a result, can guarantee on the width of steel plate and longitudinal direction on the homogeney of material.In addition, also can be reduced in strain and the residual stress that produces in the cooling.
Figure C20048001650900481
Figure C20048001650900491

Claims (43)

1. one kind is used to control the technology that the steel plate after the hot rolling is finished in cooling, described technology comprises: first cooling step, when being used for the cooling water inflow at two edges of broad ways upper steel plate, restriction cools off this steel plate, when making uniformity of temperature profile on the width of steel plate, cooling metal sheets; And second cooling step, after the uniformity of temperature profile on the width of steel plate, making cooling water can be 1 with jet density, 200L/ minute rice 2Perhaps bigger jet density flows, and in the cooling of nucleateboiling zone, the whole width of striding steel plate thus is with identical cooling velocity control cooling metal sheets.
2. as claimed in claim 1ly be used to control the technology that the steel plate after the hot rolling is finished in cooling, wherein, first cooling step comprises: when at least one the entrance side cooled region place in comprising the transmission type control cooling device of a plurality of independent cooled regions limits the cooling water inflow at two edges that are used for the broad ways upper steel plate, cool off this steel plate; And second cooling step comprise: the cooled region place after described at least one entrance side cooled region, the whole width of striding steel plate is with identical this steel plate of cooling velocity control cooling.
3. as claimed in claim 1ly be used to control the technology that the steel plate after the hot rolling is finished in cooling, wherein, first cooling step comprises: in the cooling water inflow at two edges that are used for the broad ways upper steel plate with the radiator cooler restriction, cool off this steel plate; And
Second cooling step comprises: with the transmission type control cooling device that is arranged on the radiator cooler conveyor side, the whole width of striding steel plate is with identical this steel plate of cooling velocity control cooling, and described transmission type control cooling device comprises a plurality of independently cooled regions.
4. as each described technology that is used to control cooling metal sheets among the claim 1-3, wherein, with the curtain-shaped cover member that is arranged on steel plate broad ways edge, restriction is used for the cooling water inflow at two edges of broad ways upper steel plate.
5. the technology that is used to control cooling metal sheets as claimed in claim 2, wherein, in the previous section of control cooling device, the steel plate top that restriction is used for going up in a longitudinal direction and the cooling water inflow of tail end.
6. the technology that is used to control cooling metal sheets as claimed in claim 4, wherein, in the previous section of control cooling device, the steel plate top that restriction is used for going up in a longitudinal direction and the cooling water inflow of tail end.
7. the technology that is used to control cooling metal sheets as claimed in claim 3, wherein, by radiator cooler or radiator cooler and control cooling device, the steel plate top that restriction is used for going up in a longitudinal direction and the cooling water inflow of tail end.
8. the technology that is used to control cooling metal sheets as claimed in claim 4, wherein, by radiator cooler or radiator cooler and control cooling device, the steel plate top that restriction is used for going up in a longitudinal direction and the cooling water inflow of tail end.
9. as claim 5 or the 7 described technologies that are used to control cooling metal sheets, wherein, by being used to control the control device of the water yield, the steel plate top that restriction is used for going up in a longitudinal direction and the cooling water inflow of tail end, pass through signal, one section preset time of described control device work in response to each end in the top of upper steel plate in a longitudinal direction and the tail end.
10. as claim 2 or the 5 described technologies that are used to control cooling metal sheets, wherein, previous section at the control cooling device comprises and can limit the curtain-shaped cover member that is used for along the water yield at width upper steel plate edge, described curtain-shaped cover member is arranged on along the edge of width upper steel plate and is arranged in each zone, and each curtain-shaped cover member all is that each upper surface or each lower surface of each zone, steel plate stops the cooling water that is used for along each edge of width upper steel plate independently.
11. the technology that is used to control cooling metal sheets as claimed in claim 4, wherein, described curtain-shaped cover member is arranged on the previous section of control cooling device, and each curtain-shaped cover member all is that each upper surface or each lower surface of each zone, steel plate stops the cooling water that is used for along each edge of width upper steel plate independently.
12. the technology that is used to control cooling metal sheets as claimed in claim 9, wherein, previous section at the control cooling device comprises and can limit the curtain-shaped cover member that is used for along the water yield at width upper steel plate edge, described curtain-shaped cover member is arranged on along the edge of width upper steel plate and is arranged in each zone, and each curtain-shaped cover member all is that each upper surface or each lower surface of each zone, steel plate stops the cooling water that is used for along each edge of width upper steel plate independently.
13. the technology that is used to control cooling metal sheets as claimed in claim 10, wherein, described technology also comprises: based on being used to measure along measurement mechanism measured Temperature Distribution before the control cooling of the Temperature Distribution of width upper steel plate, analyze along the temperature reduction amount of each edge of width upper steel plate and temperature sloping portion and along the distance between each edge of width steel plate; Based on the result who analyzes, calculate the quantity of the cooled region that covers, and calculate coverage amount with the curtain-shaped cover member in each zone of the previous section that is arranged on the control cooling device; And, control described curtain-shaped cover member based on result of calculation.
14. as claim 3 or the 7 described technologies that are used to control cooling metal sheets, wherein, described technology also comprises: before auxiliary cooling, measure the Temperature Distribution on the width; By the Temperature Distribution that measures, analyze along the temperature reduction amount of each edge of width upper steel plate and produce part that temperature descends and length along each edge of the steel plate of width; Based on the result who analyzes, calculate masking amount and cool time with the curtain-shaped cover member in the radiator cooler; And, be controlled at the curtain-shaped cover member in the radiator cooler and the transfer rate of steel plate based on result of calculation.
15. the technology that is used to control cooling metal sheets as claimed in claim 4, wherein, described technology also comprises: before auxiliary cooling, measure the Temperature Distribution on the width; By the Temperature Distribution that measures, analyze along the temperature reduction amount of each edge of width upper steel plate and produce part that temperature descends and length along each edge of the steel plate of width; Based on the result who analyzes, calculate masking amount and cool time with the curtain-shaped cover member in the radiator cooler; And, be controlled at the curtain-shaped cover member in the radiator cooler and the transfer rate of steel plate based on result of calculation.
16. the technology that is used to control cooling metal sheets as claimed in claim 9, wherein, described technology also comprises: before auxiliary cooling, measure the Temperature Distribution on the width; By the Temperature Distribution that measures, analyze along the temperature reduction amount of each edge of width upper steel plate and produce part that temperature descends and length along each edge of the steel plate of width; Based on the result who analyzes, calculate masking amount and cool time with the curtain-shaped cover member in the radiator cooler; And, be controlled at the curtain-shaped cover member in the radiator cooler and the transfer rate of steel plate based on result of calculation.
17. after hot rolling by as each described steel plate that is used to control the explained hereafter of cooling among the claim 1-3,5,7,13.
18. an equipment that is used for the control cooling of steel plate, the equipment of this control cooling comprises: transmission type control cooling device, and described transmission type control cooling device comprises a plurality of independently cooled regions, wherein, at each cooled region, cooling water can be 1 with jet density, 200L/ minute rice 2Perhaps bigger jet density flows, and is used for limiting the curtain-shaped cover member that is used for along the cooling water inflow at two edges of width upper steel plate and is arranged in the cooled region of previous section.
19. equipment that is used for the control cooling of steel plate, the equipment of this control cooling comprises: radiator cooler and control cooling device, described radiator cooler and described control cooling device be provided with the order be after the conveyor side of roller mill, wherein, the jet density of the cooling water in radiator cooler is 500 liters of/minute rice 2Perhaps littler, be arranged on and be used to limit the curtain-shaped cover member that is used for along the cooling water inflow at two edges of width upper steel plate in the radiator cooler, the control cooling device is the transmission type device that comprises a plurality of independent cooled regions, and the cooling water in each cooled region can be with 1200 liters of/minute rice 2Perhaps bigger jet density flows.
20., wherein, control the work of described curtain-shaped cover member, feasible uniformity of temperature profile on the width of steel plate as claim 18 or the 19 described equipment that are used for the control cooling of steel plate.
21. as claim 18 or the 19 described equipment that are used for the control cooling of steel plate, the equipment of this control cooling also comprises: the control device that is used to control the water yield, pass through signal, one section preset time of described control device work in response to the top of upper steel plate in a longitudinal direction and each end in the tail end.
22. the equipment that is used for the control cooling of steel plate as claimed in claim 20, the equipment of this control cooling also comprises: the control device that is used to control the water yield, pass through signal, one section preset time of described control device work in response to the top of upper steel plate in a longitudinal direction and each end in the tail end.
23. the apparatus that is used for the control cooling of steel plate as claimed in claim 18, the equipment of this control cooling also comprises: slit spout cooling jet.
24. the apparatus that is used for the control cooling of steel plate as claimed in claim 20, the equipment of this control cooling also comprises: slit spout cooling jet.
25. the apparatus that is used for the control cooling of steel plate as claimed in claim 21, the equipment of this control cooling also comprises: slit spout cooling jet.
26. the equipment that is used for the control cooling of steel plate as claimed in claim 19, this radiator cooler also comprises the laminar flow cooling jet, and this control cooling device also comprises slit spout cooling jet.
27. the equipment that is used for the control cooling of steel plate as claimed in claim 20, this radiator cooler also comprises the laminar flow cooling jet, and this control cooling device also comprises slit spout cooling jet.
28. the equipment that is used for the control cooling of steel plate as claimed in claim 21, this radiator cooler also comprises the laminar flow cooling jet, and this control cooling device also comprises slit spout cooling jet.
29. as claim 18 or the 23 described equipment that are used for the control cooling of steel plate, wherein, each curtain-shaped cover member is arranged in each zone in the previous section of this control cooling device, and each curtain-shaped cover member is that each upper surface or each lower surface of each zone, steel plate stops the cooling water that is used for along each edge of width upper steel plate independently.
30. the equipment that is used for the control cooling of steel plate as claimed in claim 20, wherein, each curtain-shaped cover member is arranged in each zone in the previous section of this control cooling device, and each curtain-shaped cover member is that each upper surface or each lower surface of each zone, steel plate stops the cooling water that is used for along each edge of width upper steel plate independently.
31. the equipment that is used for the control cooling of steel plate as claimed in claim 21, wherein, each curtain-shaped cover member is arranged in each zone in the previous section of this control cooling device, and each curtain-shaped cover member is that each upper surface or each lower surface of each zone, steel plate stops the cooling water that is used for along each edge of width upper steel plate independently.
32. the equipment that is used for the control cooling of steel plate as claimed in claim 29, the equipment of this control cooling also comprises: analytical equipment, be used for by being used to measure, analyze along the temperature reduction amount of each edge of width upper steel plate and produce temperature sloping portion and length along each edge of width upper steel plate along measurement mechanism measured Temperature Distribution before the control cooling of the Temperature Distribution of width upper steel plate; Calculation element is used for calculating the quantity of the cooled region that covers based on the result who analyzes, and calculates the masking amount with the curtain-shaped cover member in each zone in the previous section that is arranged on this control cooling device; And controlling organization, be used for based on result of calculation, control described curtain-shaped cover member.
33. as the equipment of claim 19 or the 26 described controls coolings that are used for steel plate, the equipment of this control cooling also comprises: measurement mechanism is used in the Temperature Distribution of measurement before the auxiliary cooling on the width; Analytical equipment is used for based on the Temperature Distribution that measures, and analyzes along the temperature reduction amount of each edge of width upper steel plate and temperature sloping portion and along the distance between each edge of width upper steel plate; Calculation element is used for calculating masking amount and the cool time of using curtain-shaped cover member in radiator cooler based on the result who analyzes; And controlling organization, be used for based on result of calculation, be controlled at the curtain-shaped cover member in the radiator cooler and the transfer rate of steel plate.
34. the equipment of the control cooling that is used for steel plate as claimed in claim 20, the equipment of this control cooling also comprises: measurement mechanism is used in the Temperature Distribution of measurement before the auxiliary cooling on the width; Analytical equipment is used for based on the Temperature Distribution that measures, and analyzes along the temperature reduction amount of each edge of width upper steel plate and temperature sloping portion and along the distance between each edge of width upper steel plate; Calculation element is used for calculating masking amount and the cool time of using curtain-shaped cover member in radiator cooler based on the result who analyzes; And controlling organization, be used for based on result of calculation, be controlled at the curtain-shaped cover member in the radiator cooler and the transfer rate of steel plate.
35. the equipment of the control cooling that is used for steel plate as claimed in claim 21, the equipment of this control cooling also comprises: measurement mechanism is used in the Temperature Distribution of measurement before the auxiliary cooling on the width; Analytical equipment is used for based on the Temperature Distribution that measures, and analyzes along the temperature reduction amount of each edge of width upper steel plate and temperature sloping portion and along the distance between each edge of width upper steel plate; Calculation element is used for calculating masking amount and the cool time of using curtain-shaped cover member in radiator cooler based on the result who analyzes; And controlling organization, be used for based on result of calculation, be controlled at the curtain-shaped cover member in the radiator cooler and the transfer rate of steel plate.
36., wherein, before this control cooling device, finisher is set as each described equipment that is used for the control cooling of steel plate in the claim 18,23 and 32.
37. the equipment that is used for the control cooling of steel plate as claimed in claim 20 wherein, was provided with finisher before this control cooling device.
38. the equipment that is used for the control cooling of steel plate as claimed in claim 21 wherein, was provided with finisher before this control cooling device.
39. the equipment that is used for the control cooling of steel plate as claimed in claim 29 wherein, was provided with finisher before this control cooling device.
40., wherein, between this radiator cooler and this control cooling device, finisher is set as claim 19 or the 26 described equipment that are used for the control cooling of steel plate.
41. the equipment that is used for the control cooling of steel plate as claimed in claim 20 wherein, is provided with finisher between this radiator cooler and this control cooling device.
42. the equipment that is used for the control cooling of steel plate as claimed in claim 21 wherein, is provided with finisher between this radiator cooler and this control cooling device.
43. the equipment that is used for the control cooling of steel plate as claimed in claim 33 wherein, is provided with finisher between this radiator cooler and this control cooling device.
CNB200480016509XA 2003-06-13 2004-06-08 Controllable cooling method for thick steel plate, thick steel plate manufactured by the controllable cooling method, and cooling device for the thick steel plate Expired - Fee Related CN100404154C (en)

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