CN1177936A - Process and device for continuous production of sheet metal strips - Google Patents
Process and device for continuous production of sheet metal strips Download PDFInfo
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- CN1177936A CN1177936A CN 96192390 CN96192390A CN1177936A CN 1177936 A CN1177936 A CN 1177936A CN 96192390 CN96192390 CN 96192390 CN 96192390 A CN96192390 A CN 96192390A CN 1177936 A CN1177936 A CN 1177936A
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- master tape
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Abstract
The invention concerns a process and a device for the continuous production of sheet metal strips, in particular of steel. A mother strip (1) with a metallically pure surface is drawn through a metal melt bath (14) and the resulting coating is smoothed by rolling immediately after leaving the melt bath. In order to design a process and device for carrying out this operation and facilitating controlled pre-heating of the mother strip to a temperature well above ambient temperature (more specifically, above 200 DEG C) without higher apparatus charge and without any risk of re-oxidation of the mother strip surface, it is proposed that the mother strip should be introduced into the metal melt bath (14) after being pre-heated to a temperature well above ambient temperature (more specifically, above 200 DEG C); the pre-heating should be done by indirect heat exchange with the melt bath in an oxygen-free environment, and the melt freshly introduced into the melt bath should be at a raised temperature corresponding to the heat loss involved in the pre-heating.
Description
The present invention relates to a kind of method, be specially adapted to steel sheet material with banded sheet material of continuous production of feature described in claim 1 preorder, and the equipment of implementing this method.
EP0311602B1 introduced a kind of method of continuous production sheet metal, for example produce thickness of slab less than 20 millimeters steel plate, adopt this method to make the pure steel band of the surface metal with room temperature (master tape) on the contrary vertically from bottom to top or direction pass through molten metal.Molten metal can adopt material identical with master tape or unlike material, the time that master tape stops in molten metal is to determine like this according to the temperature of self, make metallic crystal begin crystallization and molten metal is deposited on the surface of master tape, but itself is not melted master tape, perhaps is deposited on the no longer refuse of the lip-deep molten metal of master tape.Can produce banded semi-finished product in this way, its thickness approximately is 6 to 10 times of master tape original thickness, because process of setting and common continuous casting are distinguished to some extent, not only can also can carry out in the other direction from outside to inside, so this half-finished mode of production also is referred to as conversion casting (Invers ionsgie β en).
WO9429048 has introduced the method for another conversion casting, in this method, sheet metal from bottom to top by can directly go out behind the molten steel molten steel enter carry out in a pair of smooth roller smooth, steel band after smooth enters a cooling zone that is full of inert gas, controls cooling here to improve material property.
Generally speaking, in the conversion casting, make every effort to allow material solidification as much as possible on master tape, so master tape is to enter in the molten metal at normal temperatures usually, yet, concerning the metallic plate of producing different material layer (composite), not necessarily to reach the purpose of big as far as possible bed thickness.When producing composite board, 3 to 6 times the product that is about master tape thickness usually is different with producing, and wishes to adjust to especially little bed thickness.Can reach so in principle, promptly significantly reduce the time of contact between molten metal and the master tape.But this method also has weak point, is exactly not reach enough combinations between the material that solidified and the master tape, does not also just reach bonding safety requirements fully.For guarantee to reduce the lip-deep growth rate of master tape and guarantee again simultaneously crystal and master tape have one good bonding, can heat master tape in advance, with the cooling capacity of minimizing master tape, thereby reduce its crystallization potential energy.This method is specially adapted to produce the band (for example coating stainless steel coating on carbon steel) of multilayer material.
The preheating furnace of giving a suitable continuous oven formula of molten steel jar serial connection is as split equipment, can be implemented in master tape basically and is preheating to desired temperature before entering molten metal at every turn.Such preheating furnace can use ancient the give birth to energy (for example gas or oil) or use electric energy (for example induction furnace) heating, and words with good conditionsi also can be used plasma burner.
The method of this solution has increased the expense of optional equipment relatively; especially require the speed of service of master tape to want high relatively; generally its speed of service is in the scope of 10～100 meters of per minutes; the master tape surface that requires to enter molten metal in addition is must metal pure; that is to say; the preheating of master tape before entering molten metal must be adopted oxygen-free atmosphere protection, otherwise can cause quick oxidation, and the surface oxidation district is harmful to bonding with crystalline material.
The objective of the invention is to, a kind of method and a kind of equipment that can implement this method are proposed, thus master tape is carried out autotelic preheating, preheat temperature should surpass room temperature (will be higher than 200 ℃ especially) widely, and does not therefore increase cost of equipment and the danger that causes the master tape surface oxidation.
These class methods with the described feature of claim 1 have reached purpose of the present invention, other favourable structure of this method is illustrated in belonging to claim 2～9, the equipment of the method that carries out an invention has the described feature of claim 10, by the described feature of claim 11～18, the equipment of invention can continue to improve expansion aptly.
Requirement by inventive method, each employed master tape is after making a pure surface of metal, to be preheating to a temperature that substantially exceeds room temperature before entering the molten bath, preheat temperature should be at least 200 ℃, preferentially select greater than 300 ℃, best greater than 400 ℃, necessary words can also improve again.Heat by indirect heat exchange, that is to say the heat of the molten metal that is used for crystallization, directly do not contact master tape in order to reach this purpose molten metal, produce oxidation for fear of the master tape surface, should be made as the atmosphere of no oxygen at least in the scope internal control of the thermal treatment zone, keep this atmosphere for example can make suitable vacuum.But allowing to use protective atmosphere under the situation mostly, protection gas preferably uses argon gas, also can use nitrogen.Then the master tape after the preheating enters molten metal in known manner, begin to have the crystallization of metal liquid and operation together like this on the master tape, can regulate the desired bed thickness of master tape by the fltting speed of adjustment master tape considering that master tape immerses under the situation of the length of section and molten metal temperature in molten metal.After coming out from molten metal, suitably carry out smooth in time to crystallizing layer.Because will absorb from the molten bath and be used for the required heat of preheating master tape, this will consider in control must inject new metal liquid during bath temperature, the temperature of molten metal will than in an independent additional firing equipment (for example continuous oven) transfer corresponding higherly when carrying out The pre-heat treatment.
Method of the present invention is the most favourable when being used in the coating of common straightcarbon steel master tape, and the material of molten metal can be identical with the master tape material.Certainly, molten metal uses the material different with master tape more suitable, and the special recommendation molten metal uses heavy alloyed material.Employed master tape thickness should be as far as possible less than 3 millimeters, and preferred thickness is less than 2 millimeters, and optimum thickness is less than 1 millimeter.Employed master tape thickness is thin more, can heat soon more, and this just means that preheating can correspondingly lack, and perhaps the preheating section in identical length can reach than higher preheat temperature.
Especially propose master tape and move a kind of method by the molten bath from bottom to top, can certainly preferentially adopt the method for operation from the top down, perhaps master tape passes in and out the molten bath from the side repeatedly.When master tape passes through molten metal from bottom to top, must outwards not flow out by the position assurance liquid when master tape enters molten metal.There is a narrow slit at the place of penetrating, and it is farthest clogged by the cross section of master tape.Based on the cooling effect of master tape, near the master tape porch, has a tangible temperature difference.Be positioned at master tape inlet molten metal tagma on every side and be called as " meniscus ", big for fear of the seal approach cost of on this position, taking, should regulate the temperature of injecting new molten metal like this, promptly under the situation of the factor of considering to dispel the heat, have one in the molten bath that master tape enters the inlet near zone of molten metal and be positioned at liquid temperature T owing to the preheating of master tape
LiqWith solid state temperature T
SolBetween isothermal (district), realize that under this condition sealing is unchallenged.
The present invention is further illustrated according to accompanying drawing below.
Accompanying drawing:
Fig. 1: by the equipment axial section of one embodiment of the present of invention
Fig. 2: because the cooling velocity of heat radiation steel plate and the graph of a relation of master tape thickness and surface temperature thereof
Fig. 1 shows a structure in the cards by the equipment of invention design in schematic form, and in this dimension scale, especially the ratio of axial dimension and master tape thickness does not conform to actual ratio.
Equipment is made up of a molten steel jar 9, and its bottom is made of a sealing device 10.Certainly, molten steel jar 9 also can be equipped with one oneself the jar end, at the bottom of the jar, refill this sealing device 10.Sealing device 10 is made up of a shallow shell basically, and shallow shell has a cuboid inner chamber, and inner chamber conforms to the cross section physical dimension of the master tape 1 for the treatment of coating.The broad side walls of sealing device 10 is with reference symbol 11 marks, and the inner chamber of sealing device 10 is open-endeds all up and down, and its forms one and be the standby narrow passage of master tape thus, and broad side walls 11 employings are applicable to the refractory material of metal liquid at least.Because have a mind broad side walls 11 is carried out heat exchange as heat radiation surface, so preferably select the heat-transfer capability high refractory material of trying one's best.Broad side walls 11 can exceed the overall width of molten steel jar 9 in principle, just can cancel the narrow side of vertical edge process of master tape 1 like this under extreme case.It below the sealing device guard box 6 of installing with flange seal.Guard box 6 is furnished with an inlet suction port 8, can introduce inert gas (arrow 7) under the situation of superpressure in guard box 6 by inlet suction port 8.When introducing inert gas; for the leakage loss that makes generation little; passing through in the scope of slit of master tape 1; be equipped with a special sealing system in the guard box 6 in the favourable in addition structure of the present invention; can illustrate; shown in the figure left half, with the structure of sheet sealing device 4 or shown in the figure right half with the form structure (preferably making) of a pair of elastic packing roller 3 by duroplasts.For master tape 1 is entered in the molten metal 14 of molten steel jar 9, can make master tape 1 vertically operation from bottom to top by pinch roll pair 2 and 5.Can annotate with molten metal 14 in molten steel jar 9 by a plurality of fluid injection joints 13, fluid injection joint 13 is installed near the bottom of sealing device 10, and faces toward broad side walls 11 with its outlet, and these all use corresponding arrow to be represented.Because broad side walls 11 directly contacts with molten metal 14, it is heated and is heated to a corresponding high temperature, this just illustrates that passage 12 is a heat tunnel for the master tape 1 that enters into the inside for this reason, since the powerful heat radiation of broad side walls 11, heating extremely fast of master tape 1 beginning.According to characteristic curve shown in Figure 2, its result is not difficult to estimate.
Steel band or sheet material are shown Fig. 2 because thermal-radiating cooling velocity and the surface temperature of master tape and the relation between the thickness thereof, when the infrared source heating respective shapes that has a surface temperature by have the master tape of ambient temperature the time, chart 2 also can be explained the characteristic of firing rate conversely, and characteristic curve all is the same.Can draw thus, the steel plate of 1 millimeters thick can heat with the speed of 250 ℃ of per seconds under 1426 ℃ radiation temperature.If master tape operation passage is 1 meter with the length of using it as bringing-up section, the fltting speed of master tape is 60 meters of per seconds, and when the radiation temperature of broad side walls greatly when 1426 ℃ and master tape thickness are 1 millimeter, master tape can be heated about 250 ℃ before entering into molten metal 14 so.By the heat tunnel of a suitable length a, can influence the preheat temperature that to regulate.When identical passage length a,, then can obtain a higher temperature if it is thick to reduce motherboard.Radiation temperature for 1426 ℃, master tape thickness is 0.8 millimeter, master tape time of staying in heat tunnel 12 is 1 second a situation, (the corresponding master tape speed of service is 60 meters of per seconds, passage length is 1 meter), the preheat temperature that can draw master tape from the characteristic curve respective value of Fig. 2 raises and is about 316 ℃.
Master tape enters in the molten metal 14 soon, and liquid just begins crystallization, crystallization progressively increases and becomes the coating of representing with label 16, in order to make newly-generated coating surface smooth, a pair of smooth roller 15 suitably directly is installed above metal bath, coated tape 17 marks with the surface of smooth mistake, except preheat temperature, the coating 16 desired thickness that reach depend on the time of contact of master tape 1 and liquation 14 basically, and depend on the speed of service of master tape 1 this time of contact and immerse the length b of section, meniscus 18 marks of foregoing formation in master tape enters in the molten metal 14 zone, with dashed lines is represented several thermoisopleths, the thermoisopleth T of fluid temperature
LiqMark.Making passage 12 bores in the exit region of master tape 1 design than length in some cases is that other regional internal diameter of passage of a is narrow, in case liquid flows out, this length is at least 0.5 meter, only size so just can be issued to sufficiently high preheat temperature in the situation of high-speed cruising greater than 1 meter.
Also can realize safe the matrix material adhering method being coated with the last layer coating on master tape by the present invention, and not need to be equipped with the independent firing equipment that takes up room for this reason with a kind of.
Or rather, owing to carry out indirect heat exchange with the molten metal that uses, master tape just begins preheating in the zone before entering molten metal.
Claims (18)
1. produce the particularly method of steel sheet material of banded sheet material continuously, in this method, master tape operation with the pure surface of metal is by a metal bath, it immerses length is b, at this, the speed of service of master tape is regulated with the temperature that immerses length b and molten metal relevantly, general thickness with the requirement that reaches the crystallization that on the master tape surface, deposits and molten metal coating, and this coating can directly be undertaken smooth by smooth roller after going out the molten bath, it is characterized in that, master tape is preheating to a temperature that substantially exceeds room temperature, particularly surpass 200 ℃ temperature and enter the molten bath, this preheating be in oxygen-free atmosphere by carrying out with the indirect heat exchange in molten bath, and the molten metal that newly injects the molten bath has a temperature corresponding to the raising of the heat loss of preheating.
2. by the described method of claim 1, it is characterized in that master tape moves from bottom to top and passes through the molten bath.
3. by claim 1 or 2 described methods, it is characterized in that oxygen-free atmosphere is to keep the inert gas atmosphere of slight superpressure to form by one, is particularly suitable for argon gas and nitrogen.
4. by one of claim 1 to 3 described method, it is characterized in that preheat temperature will reach 300 ℃ at least, more preferably greater than 400 ℃.
5. by one of claim 1 to 4 described method, it is characterized in that master tape can adopt the common straightcarbon steel material.
6. by one of claim 1 to 5 described method, it is characterized in that the molten metal with the master tape same material can be used in the molten bath.
7. by one of claim 1 to 5 described method, it is characterized in that the molten bath also can be the molten metal of the steel material higher than master tape alloy content.
8. by the described method of one of claim 1 to 7, it is characterized in that master tape has one less than 3 millimeters thickness, preferably less than 2 millimeters, special preferred thickness should be less than 1 millimeter.
9. by one of claim 1 to 8 described method, it is characterized in that, regulate the new molten metal temperature of injecting in some way, make under the factor situation of the heat loss of considering the preheating master tape, in master tape enters the near zone of molten metal porch-scope of meniscus-the molten bath have a thermoisopleth, thermoisopleth is positioned at liquid temperature T
LiqWith solid state temperature T
SolBetween the scope.
10. implement equipment by the described method of claim 1, this equipment has a molten steel jar (9), a sealing device (10) is arranged in molten steel jar (9) outer wall scope, can enter and shift out molten metal (14) by sealing device master tape (1), equipment also is furnished with a device-pinch roll pair (2 that advances master tape (1), 5)-and a flattening device-smooth roller pair (15), coating in order to smooth crystallization, it is characterized in that, sealing device (10) for flat and be projected into the shell body that is roughly cuboid in the molten metal (14) dearly at the traffic direction of master tape (1), the broad side walls (11) of the extension on its plane that is parallel to master tape (1) is made by refractory material, and under the situation that forms a flat channel (12), surround master tape (1), and one keeps the device of the interior oxygen-free atmosphere in zone of passage (12) to link to each other with sealing device (10) as in-plant heat radiation surface.
11. by the described equipment of claim 10, it is characterized in that sealing device (10) is arranged in the bottom of molten steel jar (9), pay-off-pinch roll pair (2,5)-throughput direction vertically upward.
12., it is characterized in that sealing device (10) is made by refractory material, and have a higher comparatively speaking thermal conductivity factor by claim 10 or 11 described equipment.
13., it is characterized in that the injection device of molten metal (14) can be the structure that (13) are taken in a plurality of fluid injections especially near molten steel jar (9) bottom by the described equipment of claim 12, the fluid direction that fluid injection is taken over is aimed at the bottom of broad side walls (11).
14., it is characterized in that being designed to keep the structure of oxygen-free atmosphere is the inert gas shielding device by one of claim 10 to 13 described equipment.
15. by the described equipment of claim 14; it is characterized in that; the inert gas shielding device has the guard box (6) of a master tape from passage (12) (1) entrance area arch projection; by an inlet suction port (8); under the slight superpressure state of inert gas, can give guard box by air feed, and master tape (1) can enter in the case by a slit inlet.
16., it is characterized in that the slit inlet of guard box (6) selects for use a pair of hard rubber roller to external seal with a sheet sealing device (4) or a pair of resilient roller-sealed roller (3) especially by the described equipment of claim 15.
17. by one of claim 10 to 16 described equipment, it is characterized in that sealing device (10) will have 0.5 meter at least, be projected in the molten metal (14) more preferably greater than 1 meter length (a) section.
18. by one of claim 10 to 17 described equipment, it is characterized in that the bore of master tape (1) outlet area internal channel (12) is narrower than other zone within passage (12) the length a, in case molten metal flows out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96192390 CN1177936A (en) | 1995-03-07 | 1996-02-05 | Process and device for continuous production of sheet metal strips |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19509681.9 | 1995-03-07 | ||
| CN 96192390 CN1177936A (en) | 1995-03-07 | 1996-02-05 | Process and device for continuous production of sheet metal strips |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1177936A true CN1177936A (en) | 1998-04-01 |
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ID=5128244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96192390 Pending CN1177936A (en) | 1995-03-07 | 1996-02-05 | Process and device for continuous production of sheet metal strips |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1177936A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102310173A (en) * | 2010-07-01 | 2012-01-11 | Rti国际金属公司 | The continuous casting encapsulating method |
| CN106694836A (en) * | 2017-04-06 | 2017-05-24 | 江西理工大学 | Continuous casting forming device and method for solid-liquid wrapping composite material |
| CN113523241A (en) * | 2021-07-26 | 2021-10-22 | 北京科技大学 | Efficient forming method of stainless steel/carbon steel composite material |
-
1996
- 1996-02-05 CN CN 96192390 patent/CN1177936A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102310173A (en) * | 2010-07-01 | 2012-01-11 | Rti国际金属公司 | The continuous casting encapsulating method |
| CN106694836A (en) * | 2017-04-06 | 2017-05-24 | 江西理工大学 | Continuous casting forming device and method for solid-liquid wrapping composite material |
| CN113523241A (en) * | 2021-07-26 | 2021-10-22 | 北京科技大学 | Efficient forming method of stainless steel/carbon steel composite material |
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