CN1295893A - Hot rolling method and Steger hot rolling machine - Google Patents
Hot rolling method and Steger hot rolling machine Download PDFInfo
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- CN1295893A CN1295893A CN00132945A CN00132945A CN1295893A CN 1295893 A CN1295893 A CN 1295893A CN 00132945 A CN00132945 A CN 00132945A CN 00132945 A CN00132945 A CN 00132945A CN 1295893 A CN1295893 A CN 1295893A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
- B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
- B21B1/34—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by hot-rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
- B21B2013/021—Twin mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/02—Austenitic rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/04—Ferritic rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/16—Two-phase or mixed-phase rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0239—Lubricating
- B21B45/0245—Lubricating devices
- B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
- B21B45/0251—Lubricating devices using liquid lubricants, e.g. for sections, for tubes for strips, sheets, or plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- 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
- C21D9/68—Furnace coilers; Hot coilers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Control Of Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A hot-rolling method and a Steckel hot-rolling mill are disclosed. A rolling material is heated by a heating device arranged between a furnace coiler and the rolling mill and held for a fixed time to execute again the solid-solution heating to deposited material. The solid-solution heating pass is made to non-rolling reduction or extremely light rolling reduction and low speed plate passing and if necessary, this pass is repeated plural times. Particularly, the solid-solution heating pass is executed just before the last rolling pass, or the rolling material temperature just before starting the rolling is controlled to un-recrystallized austenite range or ferrite range by utilizing the heating device and a cooling device, or at least in the last rolling pass, hot-rolling oil is applied on the rolling material or an accumulated rolling reduction ratio in the un-recrystallized austenite range is made to >=50%, to prevent the coarsening of the metallurgical structure crystallization in the rolled material.
Description
The present invention relates to high-grade carbon steel be carried out the hot-rolling method and the Steger equipment of hot rolling of reversible hot-rolling by having Steger (steckel) equipment of hot rolling of coiling machine and heater in the stove.
In recent years, in order to make the product of high tenacity etc., the material that has proposed a lot of high-grade carbon steels is formed and manufacture method.For example, open in the flat 10-147843 communique, record by the good material of zerolling acquisition deep drawability in ferrite zone and form and manufacture method the spy.In addition, open in the flat 7-18381 communique, record by the temperature more than the A3 of austenite region transformation temperature and finish rolling material composition and the manufacture method that obtains excellent in deep drawing characteristics the spy.Yet, form and aimed quality in order to obtain such material, need comprise temperature controlled kinds of processes.
As the equipment and technology of having considered multiple manufacturing process as described above, for example special such tandem hot strip mill with heating and cooling device of opening flat 10-277601 communique record is arranged.This hot strip mill is provided with the formation of heating or cooling for the centre at hot finishing frame row.
On the other hand, have the reversible rolling equipment that is called Steger, this Steger rolling mills disposes coiling machine in the so-called stove in the input and output material side of milling train, and coiling machine is arranged at coiling machine in the stove in this stove.This Steger equipment of hot rolling is mainly used in the rolling of stainless steel etc. in the past.
In addition, in such Steger rolling equipment, for example have to be disclosed in the situation that the spy opens flat 11-000702 communique, international open No. 97/36700 communique of WO etc., wherein, used 2 cover rolls are encased in so-called two milling trains in 1 frame.
In addition, in the equipment that is disclosed in special fair 5-45327 communique, first heater is arranged in milling train and the stove between the coiling machine, the temperature that prevents end, above-mentioned stocking front and back descends, also second heater is arranged on milling train and is used to batch thermal output roller-way between the downcoiler of finishing the stocking after rolling, make all temperature of stocking even.In the formation that is disclosed in No. 5755128 specifications of United States Patent (USP), configuration heater and cooling device are rolled with even temperature.The main purpose of these inventions is in order to make stocking even, thereby makes the quality of stocking even, and improves the yield rate of product.
By the high-quality material of rolling acquisition of carbon steel, need comprise temperature controlled kinds of processes for as described above, the past is as the equipment and technology of the having considered such technology tandem hot strip mill of opening flat 10-277601 communique in the spy on the books.Yet in the tandem hot strip mill, it is more common that 7 finishing mills about frame are set generally speaking, needs huge equipment investment.Therefore, from the viewpoint of efficiency of investment, the output of having to set as much as possible, particularly the mill speed with thin plate is that the above high speed of 1000mpm (meter/minute) is rolled more common.When with the centre of the finishing stand row of the equipment of high-speed rolling the heating and cooling device being set like this, in order to reach required heating or cooling, it is very big that the length of heating and cooling equipment becomes.
For fear of this problem, also can consider the heating and cooling device to be set at the feed side of the row of finishing stand, carry out temperature control.In this occasion, the speed of travel of stocking is slack-off, and heating and cooling are carried out in the position that the thickness of slab before finish rolling is thicker.Therefore, the heating and cooling efficient of stocking is poor, and in the time will being controlled to up to inside all even temperature, the result can not avoid the growing up of heating and cooling device.
As known from the above, in the rolling equipment that has used existing tandem hot strip mill, obtain high-quality material by the rolling of carbon steel, but large-scale and cost of equipment is also very high.
In addition, the Steger rolling mills rolling equipment is mainly used in the rolling of stainless steel etc. in the past, in the occasion with the rolling carbon steel of this equipment, carries out batching and keeping the operation of stocking repeatedly in stove, produces oxide skin on the stocking surface, is difficult to make high-quality product.For this reason, before being about to be rolled, high-pressure fluid is ejected into the stocking surface usually, removes surface scale.Yet particularly as descaling in each passage (パ ス), there is the problem of the necessary finishing temperature that can not guarantee stocking in the occasion of the thin plate below rolling 2-3mm.Used the special Steger rolling equipment of driving two milling trains of flat 11-000702 communique, international open WO No. 97/36700 communique etc. to be solution countermeasure, we can say the problem that has solved the temperature decline that descaling of Steger equipment of hot rolling cause by this technology at this point.
Yet, in the high-quality carbon steel that has used the Steger rolling equipment rolling, have the problem of metal structure again.One of them problem is that the temperature of end before and after the stocking descends big especially.Like this, the metal structure of mill length direction is inhomogeneous, becomes the low reason of yield rate.At this problem, even according to the equipment that the fair 5-45327 communique of spy, No. 5755128 specifications of United States Patent (USP) are put down in writing by making rolling temperature, thus make the quality of stocking even, and improve the yield rate of product.Yet, can not obtain more high-intensity material, can not improve mill bar quality significantly.
In addition, for example spy in front opens in the flat 10-147843 communique in the open, during by the carbon steel of rolling high strength that comprises micro-additives such as Ti, Nb of above-mentioned Steger equipment of hot rolling and high tenacity, and also existing problems.Promptly, in the Steger equipment of hot rolling, carrying out each passage of repeat-rolling, owing to carry out batching and keeping in the stove in high-temperature atmosphere the operation of stocking repeatedly, so, can not avoid comprising thickization of set of carbide precipitate of micro-additive and the such problem of thickization of crystal grain of metallic crystal tissue.
Here, generally wish precipitate is tiny and be distributed in the metal structure equably.This is because prevent that thus the effect of thickization of metal structure grain growth is very big.Yet, as document " NbC during the austenite region hot-working of low-carbon (LC) Nb steel separates out the exploitation of model " iron and steel the 75th year (1989) No. 6 are disclosed, being rolled the occasion of processing, speed of separating out accelerates generally speaking.In the Steger equipment of hot rolling, owing to carry out batching and keep the operation of the stocking after the rolling processing repeatedly in stove, so precipitate mainly concentrates on thickization of crystal boundary, this result can not avoid.
In addition, the crystal grain of known metal tissue detailed rules and regulations more is good more, and intensity is high more.For example, in the 2.2nd chapter of " controlled rolling and control cooling " that Japanese iron and steel institute publishes, put down in writing the so-called Hall-Petch relational expression that the square root of the yield stress of matrix material and crystal grain diameter is inversely proportional to.With regard to this point, at high temperature batch the Steger rolling mills of the operation of maintenance repeatedly for a long time and we can say the formation that is not desirable.This be because, at high temperature the time of Ting Liuing long more, then grain growth, thickization of metal structure generally speaking.
As described above, for the quality existing problems of the metal structure of the milling method, particularly high-quality carbon steel of existing Steger rolling mills.Yet the Steger equipment of hot rolling is compared with existing tandem hot strip mill, and installation cost is very low, and device length can be very short, and advantage is more, so, as solving the quality problems of metal structure, be suitable for the used rolling equipment of the many kinds of small batch most.
Purpose of the present invention exists provides a kind of hot-rolling method and Steger equipment of hot rolling, and this hot-rolling method can carry out the hot rolling of carbon steel with the Steger rolling mills rolling equipment, and the high-quality material of the metal structure that can be improved.
(1) in order to achieve the above object, the invention provides a kind of hot-rolling method that adopts the Steger rolling equipment, the Steger rolling equipment is provided with coiling machine in the stove at least one side of the input and output material side of 1 milling train at least, between coiling machine heater is set in the stove of milling train and input and output material side; Wherein, carry out at least 1 be heated to by heater the precipitate that makes in the stocking again more than the temperature of solid solution in by stove in the coiling machine solid solution heating passage of batching stocking.
Like this, because the precipitate in the carbon steel stocking is solidly soluted in the metal matrix material again, so, thickization of set of precipitate can be prevented, thereby available Steger equipment of hot rolling carries out hot rolling to carbon steel, and the high-quality material of the metal structure that can be improved.
(2) in the hot-rolling method of above-mentioned (1), the state that is preferably in non-as-rolled condition or extremely gently depresses carries out solid solution heating passage, and the scope that adds thermal capacity of heater by can reach the precipitate that is enough to make in the stocking again the low velocity more than the temperature of solid solution carry out.
Like this, owing to can reduce the heat radiation of the stocking that causes of contact roll,, in addition, also can be enough to make the precipitate solid solution heating passage of solid solution again by adding the little small-sized heater of thermal capacity so can improve the efficiency of heating surface that is used for solid solution again.
(3) in the hot-rolling method of above-mentioned (1) or (2), be preferably in the stove and will heat the stocking maintenance stipulated time that passage is batched coiling machine in the stove by solid solution in the coiling machine.
Like this, can more positively carry out the solid solution again of the precipitate in the stocking.
(4) in wantonly 1 hot-rolling method in above-mentioned (1)-(3), be preferably in and be about to implement nearby carrying out the solid solution heating before the final passage or at it.
Like this, owing to carry out solid solution heating passage under the extremely thin state of stocking, so can improve the efficiency of heating surface of solid solution again, Temperature Distribution too.
(5) in the hot-rolling method of each in above-mentioned (1)-(4), preferably carry out a plurality of solid solutions heating passages continuously, and by can reach the precipitate that makes in the stocking again the low speed more than the temperature of solid solution carry out wherein last solid solution heating passage.
Like this, can be effectively and positively make the precipitate solid solution heating passage of solid solution fully again by adding that the little small-sized heater of thermal capacity can carry out.
(6) in any hot-rolling method in above-mentioned (1)-(5), carry out solid solution heating passage before being preferably in final passage, stocking temperature before the rolling beginning of final passage is controlled at non-recrystallization austenitic temperature zone, and the accumulation reduction ratio of final passage that makes this non-recrystallization austenitic temperature zone is more than 50%.
Like this, but the ferrite crystal grain of the parent metal of refinement stocking.
(7) in arbitrary hot-rolling method of above-mentioned (1)-(6), be preferably in and carry out solid solution heating passage before the final passage, at least 1 passage that comprises final passage rolling, hot-rolling oil is coated onto stocking.
Like this, wish extra high reduction ratio, solid solution heating passage is later rolling in, can reduce frictional force between roller and stocking by smearing ROLLING OIL, reduce rolling load and moment of torsion etc., make the rolling possibility that becomes of high reduction ratio, the crystal grain of fining metal tissue, thus the quality of stocking can be improved.
(8) in order to achieve the above object, the invention provides a kind of hot-rolling method that adopts the Steger rolling equipment, this Steger rolling equipment is provided with coiling machine in the stove at least one side of the input and output material side of milling train, and at least one side in the stove of milling train and input and output material side between coiling machine is provided with heater and cooling device; Wherein, carry out the non-rolling pass more than 2 at least continuously, in these non-rolling passes, carry out one at least respectively and add the passage of hot rolling material by heater and by the passage of cooling device cooling stocking.
Like this, owing to carry out ferritic crystallization again and austenitic crystallization more repeatedly, so but the crystal grain of fining metal tissue, thus can suitably carry out hot rolling by the Steger equipment of hot rolling to high-quality carbon steel.
(9) in order to achieve the above object, the invention provides a kind of Steger equipment of hot rolling, this Steger equipment of hot rolling is provided with coiling machine in the stove at least one side of the input and output material side of milling train; Wherein, have (a) and be located at and be used for heater that stocking is heated in milling train and the input and output material wing furnace between coiling machine, (b) control device is used for controlling heater to be heated to the precipitate that makes in the stocking at least one passage again more than the temperature of solid solution.
Like this, this Steger equipment of hot rolling is owing to be solidly soluted in the metal matrix material precipitate in the carbon steel stocking again, thus can prevent thickization of set of precipitate, thus can suitably carry out hot rolling to high-quality carbon steel.
(10) in order to achieve the above object, the invention provides a kind of Steger equipment of hot rolling, this Steger equipment of hot rolling is provided with coiling machine in the stove at least one side of the input and output material side of milling train; Wherein, having (a) is located at and is used for heater that stocking is heated in milling train and the input and output material wing furnace between coiling machine, (b) be located at the de-scaling device between coiling machine in milling train and the stove, (c) cooling device that is used to cool off stocking that is arranged with the de-scaling device branch.
Like this, by with carry out the special-purpose cooling device that device that the rolled material surface scale removes separates, solid solution can be heated the stocking that is in high temperature after the passage and be cooled to non-recrystallization austenite region (from the A3 transformation temperature to about 950 ℃ scope) really effectively, can carry out the desirable ausrolling after the solution treatment.
(11) in the Steger equipment of hot rolling of above-mentioned (9) or (10), be preferably in the hot-rolling oil application device is set in the milling train.
Like this, wish extra high reduction ratio, solid solution heating passage is later rolling in, can reduce frictional force between roller and stocking by smearing ROLLING OIL, reduce rolling load and moment of torsion etc., can carry out the rolling of high reduction ratio, thereby but the crystal grain of fining metal tissue to improve the quality.
(12) in any the Steger equipment of hot rolling in above-mentioned (9)-(11), preferably milling train is two milling trains.
Like this, can prevent that the temperature of stocking from descending, and can improve the accumulation reduction ratio of the crystal grain that is used for fining metal tissue, improve and send plate stability between interior coiling machine of stove and milling train.
(13) in order to achieve the above object, the invention provides a kind of Steger equipment of hot rolling, this Steger equipment of hot rolling is provided with coiling machine in the stove at least one side of the input and output material side of milling train; Wherein, have (a) and be located at the heater that at least one side between coiling machine in milling train and the input and output material wing furnace is used for stocking is heated to the temperature higher than A3 transformation temperature, (b) be located at the cooling device that at least one side between coiling machine in milling train and the input and output material wing furnace is used for stocking is cooled to the temperature lower than A3 transformation temperature.
Like this, in the Steger equipment of hot rolling owing to carry out ferritic crystallization again and austenitic crystallization more repeatedly, so the crystal grain of metal structure can refinement, thereby can be suitable high-quality carbon steel is carried out suitable hot rolling.
Fig. 1 is the skiagraph of the Steger equipment of hot rolling of the embodiment of the invention.
Fig. 1 illustrates form of implementation of the present invention.In Fig. 1, the Steger equipment of hot rolling of this form of implementation has as milling train 2 cover rollers is encased in so-called two milling trains 2 among 1 frame 2h, and two milling trains 2 are 4 roller mills, and 2 cover rolls are operation roller 2a, 2a and backing roll 2b, 2b.Feed side and exit side at two milling trains 2 are provided with coiling machine 16 in the so-called stove, coiling machine 16 is provided with coiling machine 4 in this stove in heating furnace 3, the heater 5 and the cooling device 6 of each stocking 1 are set between the coiling machine 16 in milling train 2 and stove, heating and cooling can freely be carried out.In addition, for can rolling carbon steel, be provided with toward the descaling of stocking jet surface high-pressure fluid at two milling trains 2, and the nozzle 8 that sprays hot-rolling oil is set with nozzle 7.From not shown bar plate heating stove etc. carry and the stocking 1 that comes by two milling train 2 repeat-rollings, when its thickness of slab reaches the 25mm left and right sides that can batch, on one side by idler roller 9, deflector roll 10, and stocking guider 11 etc. lead, batch by coiling machine 4 on one side.Afterwards, before reaching final thickness of slab, Yi Bian batch by coiling machine 16 in the stove of the left and right sides, Yi Bian be rolled repeatedly.Stocking 1 is carried out temperature when control, measure the temperature of stockings 1, the signal of Temperature Detector 12 is input to control device 13, by control device 13 control heater 5 or cooling devices 6, to reach target temperature by Temperature Detector 12.
In this figure, the reason that milling train is made as two milling trains 2 is for the temperature that prevents stocking 1 as much as possible descends, and improves rolling operability significantly, and this point is opened in the flat 11-207403 communique the spy and is illustrated.
The following describes the operation example of Steger equipment of hot rolling of this form of implementation of above-mentioned formation.
At first, when rolling beginning, making heater 5 and cooling device 6 by the instruction of temperature control equipment 13 control all be non-action status, and stocking 1 is transported to there from the not shown slab heat tunnel that is positioned at the milling equipment leading portion etc.
Under common occasion, the stocking of just having sent here 1 is very thick, batches difficulty by coiling machine in the stove 16, so, under the state that the stocking guider on the roller-way 11 descends, be rolled repeatedly by the passage that moves back and forth of on the horizontal feed surface channel, carrying out.Here, when being rolled by two milling trains 2, by with nozzle 7 high-pressure fluid being jetted to the surface of stocking 1, remove the oxide skin on stocking surface, and from ROLLING OIL nozzle 8 hot-rolling oil is applied between stocking 1 and the operation roller 2a simultaneously from being located at descaling of input and output material side.
When proceeding to thickness of slab and being the 25mm left and right sides, judgement can be batched by coiling machine in the stove 16 rolling, and rolling guider 11 moves up, and forms transfer passage, is sent to coiling machine 4 by pinch rolls 9 guiders such as grade, batches.
At this constantly, make the action of generating heat of in stove coiling machine 16 and heater 5 between pair milling train 2 by the instruction of temperature control equipment 13 control, 16 pairs of volumes of coiling machine are intact and heat end, the front and back stocking 1 that exposes in the stove, to prevent that temperature from descending, that is, make all Temperature Distribution of stocking 1 the same.The heating-up temperature of this moment is generally than the high temperature of A3 transformation temperature (pure iron is about 910 ℃).Coiling machine 16 batches, keeps, sends back to by hocketing respectively in 2 stoves, and stocking 1 is moved back and forth betwixt, is rolled by therebetween two milling trains 2.
Before the several passages of regulation of final rolling pass, instruction control by temperature control equipment 13 makes heater 5 actions, stocking 1 is heated to again more than the solid solubility temperature of precipitate in the stocking 1, in addition, by under non-as-rolled condition or the state extremely gently depressed, plate being moved, can carry out the solid solution heating passage of 1 or several solution treatment again to stocking 1 with low speed.Here, the solid solubility temperature again of this precipitate is generally the temperature higher than A3 transformation temperature, as the concrete example of one, is the occasion of the carbon steel of carbon containing below 0.1% at stocking 1, greatly between 1000 ℃ to about 1200 ℃ (upper limit of device capability).In addition, the stocking that in solid solution each time heating passage, heats 1 by stove in coiling machine 16 batch the back and keep certain hour.
When solid solution heating passage finishes, prevent the heating of heater 5 by the instruction control of temperature control equipment 13, before the rolling beginning of final passage, make cooling device 6 actions as required, stocking 1 is cooled to the temperature of non-recrystallization austenite region, and the final passage under suppressing by two milling trains 2.After final rolling pass finishes, descend, stocking 1 delivered to the discharging roller-way by making rolling guider 11, by the cooling of cooling facility for laminar flow 14 soluble solids is separated out once more after, batch downcoiler 15, obtain product.
The following describes the effect of each operation of above operation example.
At first, the method that prevents thickization of precipitate is described, in the occasion that is rolled with such Steger rolling mills, as the front to the metal structure problem illustrated, thickization of precipitate especially becomes problem.Particularly in the equipment that heater 5 is not set, make the concentrated huge precipitate refinement of generation by the common operation of rolling and evenly disperse very difficulty.For this point, in equipment with heater 5, by on one side stocking 1 being heated to again more than the solid solubility temperature of precipitate by desirable passage, by stove in coiling machine 16 batch on one side, keep the necessary time (the following solid solution heating passage that simply is called), can make precipitate solid solution again.Such heater 5 utilize method all not in front known example be to put down in writing in special fair 5-45327 communique and No. 5755128 specifications of United States Patent (USP), application target can be described as different in essence.This is because the application target of the heater of above-mentioned known example is the front and back end temperature control of stocking 1 or the equalizing temperature control of stocking 1 total length, is not the metal structure that improves stocking 1 as the present invention energetically.In order positively to carry out the solid solution again of above-mentioned precipitate, in stove 3, batch and be heated to the stocking more than the solid solubility temperature 1 more, keep the necessary time.
Yet, in the using method of heater 5 as described above, also have problems.Though this is also relevant with the product thickness of slab, near generally speaking before final passage rolling, below the stocking temperature drops to about 900 ℃ usually.In the occasion of rolled sheet metal etc., have to reach general said in the ausrolling sometimes and allow that lower limit temperature is below the A3 transformation temperature.At this point, the temperature of carrying out the precipitate solution treatment needs to heat significantly generally more than 1000 ℃ sometimes.This means that the maximization of heater 5 and the furnace superintendent of heating furnace 3 increase.Yet, in Steger rolling mills, consider from the angle of processing ease, wish to shorten as much as possible the distance between the coiling machine 16 in milling train and the stove.For this point, in solid solution heating passage,, can shorten required heating furnace superintendent as much as possible by not being rolled or extremely gently depressing the heating means that under the condition of (for example 5%) plate low speed passed through.In order to do one's utmost to reduce to add thermal capacity, it is more satisfactory not make operation roller 2a and stocking 1 that plate is passed through, but also has problems.That is, in the occasion of placing operation roller 2a and stocking 1 for a long time, because operation roller 2a cooling can make the formed roller surface convexity of the roller thermal expansion that produces in the operation of rolling in front (to call hot convexity in the following text) change with contactless state.Like this, begin again when rolling at every turn, the change of shape of operation roller 2a, the shape control of ensuing rolling stocking 1 can be different from the shape control method that carries out in the operation of rolling of front.This considers not wish to occur from the easiness of shape control and the viewpoint of correctness.This shows, in solid solution heating passage, by will controlling lessly for the water yield that roll cooling not shown in illustrating but that carry out usually is ejected into the cooling fluid (roller cooling agent) of operation roller 2a, or spray, and can reduce the change of shape of hot convexity effectively.
The heating that with the solution treatment is purpose also can be carried out in continuous a plurality of passages.Adopt such method, much less, can further make heater 5 miniaturizations.In addition, in the occasion of repeatedly sending the plate heat treated, also can under the state of the reel 4 that the end, front and back is batched coiling machine, carry out.This be because, be everlasting when batching the leading section of reel 4 or rearward end in the stove, temperature descends few, and remaining most stocking 1 send plate heating passage repeatedly, often carry out the cardinal principle uniform heating and keep, only a part of supercooling can not occur or force hot situation.The plate heat treated of sending that this means Steger rolling mills is carried out with any operational issue can not occurring.
In addition, the thickness of slab of stocking 1 is thin more, and then the efficiency of heating surface is high more, therefore, also can heat fully with small-sized heater 5.This means that solid solution heating passage can carry out effectively in the previous passage of final passage.In addition, thickness of slab is thin more, and then the Temperature Distribution of thickness of slab direction after the heating is even more, and solution treatment can be easily, all evenly carry out apace, and this also is to carry out one of effect of heat treated near before above-mentioned final passage.As concrete example, the general estimated value of above-mentioned solution treatment required time is considered to every 25mm thickness of slab needs about 0.5 hour retention time, so, carry out the occasion of solution treatment at thickness of slab 2.5mm, retention time in the stove is to get final product about 3 minutes, that is, thickness of slab is thin more, and the effect that then improves output is good more.
Yet,, stocking 1 high temperature is stored in the problem that there is metal structure grain growth alligatoring in coiling machine 16 in the stove though can prevent thickization of precipitate by such solution treatment of above explanation.Therefore, under this state, can not solve the problem of the intensity decline of matrix material metal as described above.Clear about this point, also on the books in the 2.2nd chapter of this document of mentioning in front " controlled rolling and control cooling ", that is, the factor of decision ferrite grain size is the accumulation reduction ratio at the non-recrystallization austenite region.As the clear document that this point is shown, there is Nippon Steel's skill to report No. 365 (1997) " two cross rolling mills of slab depress greatly rolling technique " etc.By above-mentioned document etc. as can be known, the accumulation reduction ratio is in the occasion 50% below, and ferritic grain size cardinal principle reduces with above-mentioned reduction ratio is proportional (reduction ratio is big more), more than 50%, be preferably in 60% saturated substantially when above.Therefore, by carrying out solution treatment of the present invention, the crystal grain of thickization can form tiny ferrite crystal grain by suppressing down at the non-recrystallization austenite region subsequently.Generally, rolling load is big when carrying out depressing more than 50% by 1 milling train, restive shape, very difficulty.Therefore, many milling trains preferably are set.Particularly consider, adopt two milling trains 2 comparatively desirable from the stability of operation.
Stocking 1 after rolling is as described above cooled off by the cooling device 14 that is arranged on the discharging roller-way, batch downcoiler 15 and commercialization, the cooling of discharging this moment roller-way is very important to the quality of decision final products, and this is identical with existing controlled rolling technology.That is, by the precipitate after the milling method solid solution of the present invention by by 14 coolings of above-mentioned cooling device and separate out once more.Here use the stocking 1 after the solution treatment, mean that the major part of the precipitate that residues in final products is formed by the cooling on the above-mentioned discharging roller-way.Therefore, by control the cooling on the discharging roller-way corresponding to rolling steel grade, no matter the rolling experience before the solution treatment how, all can be carried out the best of precipitate and separate out control.Specifically, can as far as possible tiny precipitate be distributed in the matrix material equably.Like this, can be suppressed at the growth from austenite phase transformation to ferritic ferrite crystal grain on the discharging roller-way, improve product strength, reduce the solid solution carbon amount in the matrix material simultaneously, produce the product that is rich in toughness.
More than be the basic consideration method of the new rolling mill practice that is applicable to milling method that the present invention proposes and rolling equipment.Words as described further, in ausrolling, the rolling non-recrystallization austenite region that is preferably in that carries out after the solution treatment carries out.This means that stocking 1 is rolled in the temperature range from the A3 transformation temperature to about 950 ℃ of cardinal principles.Therefore, temperature being brought up to above-mentioned scope when above,, cool off after being preferably in solution treatment in order in above-mentioned scope, to be rolled effectively by solution treatment of the present invention.As cooling device, descale with nozzle 7 though also can use, do not wish to use the script purpose to control the temperature of stocking 1 with regard to different devices.Descaling with nozzle 7 purpose originally is the oxide skin of removing the stocking surface, generally becomes the high-pressure fluid more than the 100kg/cm2 is ejected into equipment such on the rolled surface in a large number for this reason.When using such device control temperature, need controlled pressure and flow, in fact unusual difficulty, and can be described as the using method of poor efficiency.As the purpose that is cooled to, then do not need such high-pressure fluid, the isolated plant 6 that preferably uses the such water-cooled of the cooling of laminar flow for example etc. to use in the past with stocking 1.Yet, in such occasion, much less also can consider rolling pattern, to carry out solution treatment before final rolling several passages, making ensuing rolling result is the rolling of non-recrystallization austenite region.
In addition, particularly in the occasion of carrying out ferrite rolling, yes uses above-mentioned cooling device 6 and descales with any or two in the nozzle 7, controls to below the A3 transformation temperature.Thicker as plate, can not drop to set point of temperature by 1 time after solution treatment cooling by the ability of set cooling device 6, then can carry out repeatedly non-as-rolled condition or common rolling pass repeatedly, cool off up to the temperature that reaches regulation.
In above such equipment,, can give play to special effect as the rolling hot-rolling oil of smearing more than at least 1 passage in later rolling of solution treatment at least.Clearly, by using hot-rolling oil, can reduce the frictional force of 1 of operation roller 2a and stocking, rolling load and moment of torsion etc. diminishes.Certainly this is particularly effective when the zerolling of ferrite rolling etc.As subsidiary intrinsic effect of the present invention, the front is illustrated, and in order to do one's utmost to reduce the final ferritic grain size that obtains, it is more effective to improve the accumulation reduction ratio.We can say that later rolling of solution treatment is preferably high as far as possible reduction ratio at least.Rolling in order to realize under the high pressure, should utilize the operation roller 2a of as far as possible little diameter.In addition, consider, preferably as far as possible by the driving of operation roller 2a from rolling stability.Yet driving is that the allowable torque of particularly axle is suppressed lessly, can not transmit big moment of torsion.In order to relax this restriction, wish extra high reduction ratio, use hot-rolling oil in rolling after the solution treatment, can carry out the rolling of high reduction ratio, have the crystallite dimension of fining metal tissue, the effect that improves the quality.As the effect of direct influence tissue, reduce the frictional force of 1 of operation roller 2a and stocking, the shearing force that promptly reduces to act between stocking 1 and operation roller 2a diminishes.This means that near the partial cut distortion that acts on the stocking top layer is little, have and make the effect of rolling structure along thickness of slab direction homogenising.This we can say the purpose that has promoted the uniform high-quality material of production of the present invention.
In form of implementation shown in Figure 1, used two milling trains 2 as milling train, but, also had identical effect certainly as the milling train of one or more common frames.Yet the occasion heater 5 and cooling device 6 being arranged at 16 of coiling machines in milling train and the stove has special effect with milling train as two milling trains 2.That is, when heater 5 and cooling device 6 are set, about the elongated 1m of distance that the interior coiling machine of milling train and stove is 16, increased the difficulty of batching operation.This is that what wander off is dangerous big owing to be rolled and send plate to arrive coiling machine up to the front end of stocking 1 under tension-free state, send the poor stability of plate.Different therewith, in the occasion that adopts two milling trains 2, the distance of 2 cover roll shop buildings is very short, send in the plate process and positively retrains stocking 1 by above-mentioned 2 cover rolls, makes and send the stability of plate to significantly improve, thereby can eliminate the difficulty of aforesaid operations.Like this, the inevitable elongated such occasion of this rolling equipment of the distance of 16 of coiling machines in milling train and stove, it is effective especially that two milling trains 2 are set.
For heater is heated effectively, preferably adopt electromagnetic induction heating.In addition, also can roughing mill be set, a plurality of finishing mills are set in the back in the front of such Steger equipment of hot rolling.The accumulation reduction ratio that finishing mill can further strengthen final passage particularly is set in the back.
Figure 1 illustrates the occasion that cooling device 6 and heater 5 are set simultaneously, also can for example heater 5 only be set according to rolling steel grade.In addition, shown in this figure heater 5 is located at upside, cooling device 6 is located at the occasion of downside, but each device is arranged at two sides up and down, or both positions that is provided with are turned around at feed side and exit side, or only establish cooling device 6 in a side, at opposite side heater 5 only is set, also can obtains identical effect certainly.
Another operation example as using Steger equipment of hot rolling shown in Figure 1 also can adopt such milling method, promptly, be not rolled or extremely gently depress in the passage more than at least 1, low speed send plate, optionally makes heater 5 and cooling device 6 actions, carries out heating and cooling successively repeatedly.For example, at first the ferrite that the temperature of the stocking 1 of the austenite structure more than the A3 transformation temperature is dropped to below the A3 transformation temperature generates the zone, afterwards the stocking of ferritic structure is heated to austenite structure more than the A3 transformation temperature etc.Generally speaking, when making carbon steel pass through the A3 transformation temperature, metal structure for example is ferrite or is recrystallised to austenite from ferrite from austenite recrystallization, but utilizes the crystal grain of this point fining metal tissue.That is, before final passage by above-mentioned Technology for Heating Processing in advance with the crystal grain refinement as much as possible of matrix material, useful to the quality that improves final products certainly.And, by controlling either party or two sides in the above-mentioned heating and cooling, can rolling simply two-phase (austenite and ferritic line and staff control).
Like this, the rolling preceding metal structure that in fact is very difficult to carry out for existing large-scale hot strip rolling equipment is freely formed and can be realized simply by this form of implementation.In addition, existing Steger is specifically designed to special steels such as stainless steel, can make it also be applicable to high-quality carbon steel by this form of implementation.
According to the present invention, owing to be solidly soluted into the precipitate in the carbon steel stocking in the metal matrix material again, so can prevent the set alligatoring of precipitate, and then can use the Steger equipment of hot rolling that carbon steel is carried out hot rolling, and high-quality material of the metal structure that can be improved.
According to the present invention, the accumulation reduction ratio of the final passage by making non-recrystallization austenitic temperature zone is more than 50%, but the ferrite crystal grain in the parent metal of refinement stocking.
In addition, according to the present invention, owing to carry out ferritic crystallization again and austenitic crystallization more repeatedly, so but the crystal grain of fining metal tissue, thus can be by the suitably rolling high-quality carbon steel of Steger equipment of hot rolling.
Claims (13)
1, a kind of hot-rolling method that adopts the Steger rolling mills rolling equipment, this Steger rolling mills rolling equipment is provided with coiling machine in the stove at least one side of the input and output material side of 1 milling train at least, between coiling machine heater is set in the stove of above-mentioned milling train and above-mentioned input and output material side; It is characterized in that: carry out at least 1 be heated to by above-mentioned heater the precipitate that makes in the stocking again more than the temperature of solid solution in by above-mentioned stove in the coiling machine solid solution heating passage of batching stocking.
2, hot-rolling method as claimed in claim 1, it is characterized in that: carry out above-mentioned solid solution heating passage in non-as-rolled condition or the state extremely gently depressed, and the scope that adds thermal capacity of above-mentioned heater by can reach the precipitate that is enough to make in the stocking again the low velocity more than the temperature of solid solution carry out.
3, hot-rolling method as claimed in claim 1 or 2 is characterized in that: will keep the stipulated time by the stocking that above-mentioned solid solution heating passage is batched coiling machine in the stove in the coiling machine in above-mentioned stove.
4, as each described hot-rolling method among the claim 1-3, it is characterized in that: before being about to implement final passage or at it, nearby carry out above-mentioned solid solution heating.
5, as each described hot-rolling method among the claim 1-4, it is characterized in that: carry out a plurality of above-mentioned solid solutions heating passages continuously, and by can reach the precipitate that makes in the stocking again the low speed more than the temperature of solid solution carry out wherein last solid solution heating passage.
6, as each described hot-rolling method among the claim 1-5, it is characterized in that: before final passage, carry out solid solution heating passage, stocking temperature before the rolling beginning of final passage is controlled at non-recrystallization austenitic temperature zone, and the accumulation reduction ratio of final passage that makes this non-recrystallization austenitic temperature zone is more than 50%.
7, as each described hot-rolling method among the claim 1-6, it is characterized in that: before above-mentioned final passage, carry out above-mentioned solid solution heating and meet with time, at least 1 passage that comprises final passage rolling, hot-rolling oil is coated onto stocking.
8, a kind of hot-rolling method that adopts the Steger rolling mills rolling equipment, this Steger rolling mills rolling equipment is provided with coiling machine in the stove at least one side of the input and output material side of milling train, and at least one side in the stove of above-mentioned milling train and input and output material side between coiling machine is provided with heater and cooling device; It is characterized in that: carry out the non-rolling pass more than 2 at least continuously, in these non-rolling passes, carry out one at least respectively and add the passage of hot rolling material by above-mentioned heater and by the passage of above-mentioned cooling device cooling stocking.
9, a kind of Steger equipment of hot rolling is provided with coiling machine in the stove at least one side of the input and output material side of milling train; It is characterized in that: comprising:
(a) be located at and be used for heater that stocking is heated in above-mentioned milling train and the above-mentioned input and output material wing furnace between coiling machine,
(b) control device is used for controlling above-mentioned heater to be heated to the precipitate that makes in the stocking at least one passage again more than the temperature of solid solution.
10, a kind of Steger equipment of hot rolling is provided with coiling machine in the stove at least one side of the input and output material side of milling train; It is characterized in that: comprising:
(a) be located at and be used for heater that stocking is heated in above-mentioned milling train and the above-mentioned input and output material wing furnace between coiling machine,
(b) be located at the de-scaling device between coiling machine in above-mentioned milling train and the above-mentioned stove,
(c) separate with above-mentioned de-scaling device and be arranged at the cooling device that is used to cool off stocking in above-mentioned milling train and the above-mentioned stove between the coiling machine.
11, as claim 9 or 10 described Steger equipment of hot rolling, it is characterized in that: the hot-rolling oil application device is set in above-mentioned milling train.
12, as any one described Steger equipment of hot rolling among the claim 9-11, it is characterized in that: above-mentioned milling train is two milling trains of the 2 cover rollers of packing in 1 frame.
13, a kind of Steger equipment of hot rolling is provided with coiling machine in the stove at least one side of the input and output material side of milling train; It is characterized in that: comprising:
(a) be located at the heater that at least one side between coiling machine in above-mentioned milling train and the above-mentioned input and output material wing furnace is used for stocking is heated to the temperature higher than A3 transformation temperature,
(b) be located at the cooling device that at least one side between coiling machine in above-mentioned milling train and the input and output material wing furnace is used for stocking is cooled to the temperature lower than A3 transformation temperature.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP325562/1999 | 1999-11-16 | ||
| JP32556299A JP3691996B2 (en) | 1999-11-16 | 1999-11-16 | Steckel hot rolling equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1295893A true CN1295893A (en) | 2001-05-23 |
Family
ID=18178289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00132945A Pending CN1295893A (en) | 1999-11-16 | 2000-11-16 | Hot rolling method and Steger hot rolling machine |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP3691996B2 (en) |
| KR (1) | KR20010051685A (en) |
| CN (1) | CN1295893A (en) |
| DE (1) | DE10056847A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102199697A (en) * | 2011-06-08 | 2011-09-28 | 河北省首钢迁安钢铁有限责任公司 | Method for improving low-temperature impact toughness of high-strength steel hot rolled plate coil for engineering machines |
| CN102834194A (en) * | 2009-12-30 | 2012-12-19 | 达涅利机械设备股份公司 | Winding/unwinding device and method for winding/unwinding a metal product in a rolling line |
| CN103639199A (en) * | 2007-10-16 | 2014-03-19 | 株式会社Ihi | Magnesium alloy hot rolling apparatus |
| CN107405658A (en) * | 2015-03-09 | 2017-11-28 | 东芝三菱电机产业系统株式会社 | Rolling equipment |
| CN110340161A (en) * | 2019-07-25 | 2019-10-18 | 燕山大学 | A kind of heating device, rolling device and its milling method of thick steel plate on-line rolling |
| CN111167858A (en) * | 2020-01-03 | 2020-05-19 | 北京科技大学 | Method for headless rolling of ferrite area of ultrathin strip steel |
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| DE10141646C1 (en) * | 2001-08-24 | 2003-03-27 | Elotherm Gmbh | Device for inductively heating metallic workpieces used in rolling installations comprises a heating device, and a conveying roller having sections made from a ceramic material |
| DE10203711A1 (en) * | 2002-01-31 | 2003-08-14 | Sms Demag Ag | Process and plant for the production of hot strip from austenitic stainless steels |
| JP4946516B2 (en) * | 2007-03-02 | 2012-06-06 | Ｊｆｅスチール株式会社 | Hot rolling equipment and hot rolling method using the same |
| CN103464457A (en) * | 2013-08-19 | 2013-12-25 | 中国重型机械研究院有限公司 | Hybrid rolling reversing cold-rolling mill unit |
| DE102015210863A1 (en) * | 2015-04-15 | 2016-10-20 | Sms Group Gmbh | Casting-rolling plant and method for its operation |
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-
1999
- 1999-11-16 JP JP32556299A patent/JP3691996B2/en not_active Expired - Fee Related
-
2000
- 2000-11-15 KR KR1020000067578A patent/KR20010051685A/en not_active Application Discontinuation
- 2000-11-16 CN CN00132945A patent/CN1295893A/en active Pending
- 2000-11-16 DE DE10056847A patent/DE10056847A1/en not_active Ceased
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103639199A (en) * | 2007-10-16 | 2014-03-19 | 株式会社Ihi | Magnesium alloy hot rolling apparatus |
| CN102834194A (en) * | 2009-12-30 | 2012-12-19 | 达涅利机械设备股份公司 | Winding/unwinding device and method for winding/unwinding a metal product in a rolling line |
| CN102834194B (en) * | 2009-12-30 | 2015-05-27 | 达涅利机械设备股份公司 | Winding/unwinding device and method for winding/unwinding a metal product in a rolling line |
| CN102199697A (en) * | 2011-06-08 | 2011-09-28 | 河北省首钢迁安钢铁有限责任公司 | Method for improving low-temperature impact toughness of high-strength steel hot rolled plate coil for engineering machines |
| CN107405658A (en) * | 2015-03-09 | 2017-11-28 | 东芝三菱电机产业系统株式会社 | Rolling equipment |
| CN110340161A (en) * | 2019-07-25 | 2019-10-18 | 燕山大学 | A kind of heating device, rolling device and its milling method of thick steel plate on-line rolling |
| CN110340161B (en) * | 2019-07-25 | 2020-08-28 | 燕山大学 | Heating device, rolling device and rolling method for on-line rolling of thick steel plate |
| CN111167858A (en) * | 2020-01-03 | 2020-05-19 | 北京科技大学 | Method for headless rolling of ferrite area of ultrathin strip steel |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20010051685A (en) | 2001-06-25 |
| DE10056847A1 (en) | 2001-05-31 |
| JP3691996B2 (en) | 2005-09-07 |
| JP2001137907A (en) | 2001-05-22 |
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