CN111760912B - Method and system for connecting endless rolling intermediate billets of hot rolled strip steel - Google Patents
Method and system for connecting endless rolling intermediate billets of hot rolled strip steel Download PDFInfo
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- CN111760912B CN111760912B CN202010675468.6A CN202010675468A CN111760912B CN 111760912 B CN111760912 B CN 111760912B CN 202010675468 A CN202010675468 A CN 202010675468A CN 111760912 B CN111760912 B CN 111760912B
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- 238000005096 rolling process Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 16
- 239000010959 steel Substances 0.000 title claims abstract description 16
- 230000007246 mechanism Effects 0.000 claims abstract description 42
- 238000005507 spraying Methods 0.000 claims abstract description 24
- 238000007789 sealing Methods 0.000 claims abstract description 20
- 238000010008 shearing Methods 0.000 claims abstract description 17
- 230000008569 process Effects 0.000 claims abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 37
- 238000003466 welding Methods 0.000 claims description 24
- 239000000843 powder Substances 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 20
- 239000010410 layer Substances 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 229910052742 iron Inorganic materials 0.000 claims description 14
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 12
- 239000011229 interlayer Substances 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 238000007133 aluminothermic reaction Methods 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 5
- 239000000376 reactant Substances 0.000 claims description 4
- 239000003832 thermite Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- 229910000599 Cr alloy Inorganic materials 0.000 claims description 3
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 3
- 229910001080 W alloy Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- 239000002826 coolant Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000007747 plating Methods 0.000 claims description 3
- 238000005304 joining Methods 0.000 claims 5
- 210000001503 joint Anatomy 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 description 13
- 238000012423 maintenance Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004093 laser heating Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0085—Joining ends of material to continuous strip, bar or sheet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0092—Welding in the rolling direction
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a method and a system for connecting a headless rolling intermediate billet of hot rolled strip steel, belonging to the technical field of hot rolled strip steel, wherein the connecting method comprises the following steps: the head end and the tail end of a preceding intermediate billet after the rough rolling process and a subsequent intermediate billet conveyed immediately after the preceding intermediate billet are butted in the process before continuously conveying the preceding intermediate billet to the finish rolling process, wherein: before butt joint, the head end and the tail end of the two are respectively formed with straight end faces in the width direction, and then the straight end faces of the head end and the tail end of the two are aligned, spaced, sealed, thermit reacted, fused and connected and cooled in sequence in butt joint to realize connection. The connecting system comprises a roughing mill, a shearing machine, a connecting device and a finishing mill which are sequentially arranged along the rolling line direction, wherein the connecting device comprises a sealing mechanism and a spraying mechanism. The invention solves the problems of complex intermediate blank connecting equipment and poor reliability.
Description
Technical Field
The invention belongs to the technical field of hot rolled strip steel, and particularly relates to a method and a system for connecting a headless rolled intermediate billet of a hot rolled strip steel.
Background
The endless rolling technology of hot rolled strip steel is one of the most advanced technologies in the world of steel production at present, and can connect a plurality of rough rolled intermediate billets, continuously enter a finishing mill group, continuously and stably roll by the finishing mill group, stably cool and control phase change by a laminar cooling line, and finally cut by flying shears and roll into a plurality of hot rolled strip steel coils by a coiling machine. Compared with conventional rolling, endless rolling can obviously improve production efficiency and yield, improve threading performance, reduce roller consumption and realize stable production of new products such as ultrathin belts.
The conventional hot continuous rolling production is changed into endless rolling production, and the most critical technical problem is the problem of connecting the intermediate blanks after rough rolling. Because the endless rolling adopts a belt tension rolling mode, and the second flow of the intermediate billet is equal to that of the finish rolling machine, the connection speed and quality of the intermediate billet in a hot state influence whether the endless rolling can be realized or not: if the connecting speed is too slow and the connecting time is too long, the production efficiency is affected, obvious temperature drop is generated, and the follow-up finish rolling is difficult to carry out; if the connection strength is not high and the quality is poor, the connection part is easy to break, so that continuous finish rolling cannot be performed; more importantly, since the conventional hot rolling endless rolling is mainly oriented to the improvement of the existing built hot continuous rolling production line, the space of the production line is fixed, so that the connecting equipment is not suitable to be huge and complex, otherwise, the installation position of the equipment is limited, and the investment and the production maintenance cost are increased.
At present, the endless rolling intermediate billet connecting method realizes industrial application of induction heating connecting method, laser heating connecting method and shearing press connecting method. The huge induction heating mechanism of induction heating connection method needs to be moved at least 20m to finish welding, and the space of the existing hot continuous rolling production line is fixed, so that the running space of the connection equipment 20m is required to be met, and the welding is not easy to realize. The laser thermal welding method also requires the connection device to move during the connection, and thus has a problem in that the movement space of the connection device is limited. And the power required by the laser is very large, so that the equipment investment and the production cost are obviously increased. The shearing and press-connecting method adopts a specially designed shearing machine to shear the overlap area of the intermediate blank along the inclined plane, and applies pressure to the inclined plane to form physical combination along the shearing plane while shearing. The device is bulky, has a length of about 17m, occupies a large space, and is costly in terms of equipment investment and maintenance, due to the extremely high pressures required to meet the physical connections.
Summarizing the existing intermediate blank connection mode, the most important problems are large equipment investment, high maintenance cost, large equipment occupation area or large space for the connection mechanism to walk, which is certainly the biggest obstacle for the transformation of the existing production line with fixed space.
Disclosure of Invention
In view of the above, the present invention aims to provide a method and a system for connecting a hot rolled strip and a headless rolled intermediate billet, which are used for solving the problems of complex intermediate billet connecting equipment and poor reliability in the prior art.
The invention is realized by the following technical scheme:
The invention provides a method for connecting a head-free rolling intermediate billet of hot rolled strip steel, which is characterized in that the head end and the tail end of a preceding intermediate billet after a rough rolling process and a subsequent intermediate billet conveyed by the following preceding intermediate billet are butted in the process of continuously conveying the preceding intermediate billet to a finish rolling process, wherein: before butt joint, the head end and the tail end of the two are respectively formed with straight end faces in the width direction, and then the straight end faces of the head end and the tail end of the two are aligned, spaced, sealed, thermit reacted, fused and connected and cooled in sequence in butt joint to realize connection.
Preferably, the trailing end flat end face of the preceding intermediate blank and the leading end flat end face of the following intermediate blank have straight faces parallel to each other and forming a predetermined angle with respect to the slab width direction.
Preferably, the temperature of the slab before the thermit reaction is controlled to be 950-1050 ℃, and the temperature of the slab after cooling is controlled to be 950-1100 ℃.
The invention also provides a connecting system of the hot rolled strip steel endless rolling intermediate billet, which is used for realizing the connecting method, and comprises a roughing mill, a shearing machine, a connecting device and a finishing mill which are sequentially arranged along the rolling line direction, wherein the connecting device comprises a sealing mechanism and an injection mechanism, the shearing machine is used for cutting the tail end of a preceding intermediate billet and the head end of a subsequent intermediate billet into straight end surfaces, the sealing mechanism is used for sealing the two straight end surfaces separated by a certain distance, a cooling loop is arranged in an interlayer of the sealing mechanism, the injection mechanism is used for injecting welding powder into the interval between the two sealed straight end surfaces, the high temperature of a slab provides an aluminothermic reaction condition for the welding powder, so that the welding powder generates molten iron to fill the interval to form a joint part, and the joint part is rapidly cooled by the cooling loop.
Further, a hot coil box is arranged between the roughing mill and the shearing machine.
Further, a deburring machine is arranged between the connecting device and the finishing mill.
Further, the spraying mechanism is provided with a plurality of spraying nozzles with adjustable spraying speed, spraying angle and spraying quantity, and the spraying nozzles are arranged at intervals along the width direction of the slab.
Further, the welding powder is a mixture of Al, fe 2O3 and Fe 3O4, wherein the volume ratio of the mixture of Fe 2O3 and Fe 3O4 is inversely proportional to the thickness of the iron scale of the slab.
Further, the welding powder contains a slag former for separating Al 2O3 generated by the thermite reaction from molten iron, and the main components of the slag former are CaO, siO 2 and B 2O3.
Further, the interlayer of the sealing mechanism is arranged between the inner layer and the outer layer, the inner layer is made of copper plates, the outer layer is made of steel plates, the inner surface of the inner layer is coated with a plating layer added with nickel, chromium and tungsten alloy, the cooling circuit of the interlayer is made of copper pipes, and the cooling medium in the cooling circuit is water.
The invention has the advantages that:
1. The invention has simple connection process equipment, is composed of a sealing mechanism with a cooling function and an injection mechanism with adjustable injection speed, injection angle and injection quantity, and has small occupied area and low maintenance cost.
2. The invention adopts a mature self-propagating high-temperature synthesis technology, can rapidly and stably realize the connection between the intermediate blank with large cross section and special-shaped cross section and different steel types, has reliable connection mode and greatly expands the product range.
3. The invention provides necessary temperature conditions for thermite reaction because the intermediate billet is in a high temperature state before connection, and the molten iron generated after the reaction is cooled to realize firm metallurgical connection, so that the connection strength is high.
4. The iron oxide scale existing on the surface of the intermediate blank can affect the solid state connection effect, and the general intermediate blank connection mode needs to carry out the descaling process before connection, but the iron oxide is taken as a reactant to participate in the thermit reaction, so that the descaling process before connection is reduced, and the use amount of oxide in welding powder is saved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings, in which:
Fig. 1 is a schematic diagram of a connection system according to the present invention.
Fig. 2 is a schematic diagram of the closing mechanism and the spraying mechanism of the connecting device of the present invention.
FIG. 3 is a schematic view of a cooling joint of a closure mechanism of a connecting device of the present invention.
Fig. 4 is a schematic view of the joint of the intermediate blank of the present invention.
Fig. 5 is a partial perspective view of the closure mechanism of the connecting device of the present invention.
Description of element numbers: the device comprises a follow-up intermediate blank 1, a preceding intermediate blank 2, a closing mechanism 3, a spraying mechanism 4, welding powder 5, a joint part 6, a roughing mill 7, a hot coil box 8, a shearing machine 9, a finishing mill 10 and a deburring machine 11.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1-5, the hot rolled strip headless rolling intermediate billet connecting system provided in this embodiment is arranged between a roughing mill 7 and a finishing mill 10 on a hot continuous rolling production line, and the intermediate billet in the process of traveling sequentially passes through a shearing machine 9, a connecting device and a deburring machine 11 according to the traveling direction; the connecting device comprises a sealing mechanism 3 and a spraying mechanism 4, wherein a shearing machine 9 is used for cutting the tail end of a preceding intermediate billet 2 and the head end of a subsequent intermediate billet 1 into straight end faces, the sealing mechanism 3 is used for sealing the two straight end faces separated by a certain distance, a cooling circuit is arranged in an interlayer of the sealing mechanism, the spraying mechanism 4 is used for spraying welding powder 5 into the interval between the two sealed straight end faces, the high temperature of a slab provides aluminothermic reaction conditions for the welding powder 5, the welding powder 5 generates molten iron to fill the interval to form a joint part 6, and the joint part 6 is rapidly cooled by the cooling circuit.
The connecting method based on the hot rolled strip steel endless rolling intermediate billet connecting system comprises the following steps: the leading intermediate billet 2 after the rough rolling process and the following intermediate billet 1 conveyed immediately after the leading intermediate billet 2 are butt-joined end to end in the process before the finish rolling process, wherein: before butt joint, the head end and the tail end of the two are respectively formed with straight end faces in the width direction, and then the straight end faces of the head end and the tail end of the two are aligned, spaced, sealed, thermit reacted, fused and connected and cooled in sequence in butt joint to realize connection. Specifically, the end parts of intermediate blanks after the roughing mill 7 are cut and leveled by utilizing a shearing machine 9, so that the head and tail parts of two adjacent intermediate blanks form flat end surfaces; aligning the head end and the tail end of the preceding intermediate blank 2 with the head end and the tail end of the following intermediate blank 1, and keeping a certain interval between straight end surfaces of the head end and the tail end; when the device walks to the connecting device, the sealing mechanism 3 clamps the preceding intermediate blank 2 and the following intermediate blank 1 and forms a connecting cavity with the four sides sealed, the spraying mechanism 4 sprays welding powder 5 in alignment with the gap between the two straight end surfaces, the high-temperature plate blank provides a thermal reaction temperature condition for the reaction, the welding powder 5 and the head end and the tail end of the high-temperature plate blank are subjected to thermit reaction, iron oxide skin on the surface of the plate blank can be used as a reactant to participate in the reaction, heat is instantaneously released, molten iron is generated to fill the connecting cavity, and a joint part 6 is formed; then, closing a cover plate of the connecting cavity, opening a circulating water system of a cooling loop in the sealing mechanism 3, rapidly cooling the joint part 6 in fusion connection through the cooling loop carried by the sealing mechanism 3, cooling molten iron to 950-1100 ℃ to realize firm metallurgical connection of the joint part 6, and meeting the temperature condition of entering the finishing mill 10 for rolling; finally, the sealing mechanism 3 is automatically removed, the deburring machine 11 is used for removing redundant burrs of the joint part 6, the burrs are prevented from damaging a finishing mill roller after entering the finishing mill 10, and finally the burrs enter the finishing mill 10 for rolling; the closing mechanism 3 and the spraying mechanism 4 return to the original positions and wait for the next working instruction.
In this embodiment the temperature at which the intermediate billet enters the connecting device is controlled to be 950-1050 ℃.
The trailing end straight end face of the preceding intermediate blank 2 and the leading end straight end face of the following intermediate blank 1 in this embodiment have straight faces parallel to each other and forming a predetermined angle with respect to the slab width direction.
The hot rolling box 8 is also arranged between the roughing mill 7 and the shearing machine 9 in the embodiment, so that the temperature can be uniform, the surface quality can be improved, the process buffer function is realized in the processing process, and meanwhile, the hot rolling box 8 can be used for storing intermediate blanks so as to have enough time and space for connecting the intermediate blanks.
The ejection mechanism 4 in the present embodiment is provided with a plurality of nozzles whose ejection speed, ejection angle, and ejection amount are all adjustable, and the nozzles are arranged at intervals in the slab width direction.
The welding powder 5 in this example is a mixture of Al, fe 2O3, and Fe 3O4, where the volume ratio of the Fe 2O3 and Fe 3O4 mixture is inversely proportional to the slab scale thickness.
In this embodiment, the welding powder 5 contains a slag former composed of CaO, siO 2, and B 2O3 as minor components, so that Al 2O3 generated by the thermit reaction is separated from molten iron, al 2O3 generated by the thermit reaction is prevented from remaining in the molten iron, and the connection strength of the joint portion 6 is reduced.
The interlayer of the closing mechanism 3 in the embodiment is arranged between an inner layer and an outer layer, the inner layer is made of copper plates, the outer layer is made of steel plates, the inner surface of the inner layer is coated with a plating layer added with nickel, chromium and tungsten alloy, the friction resistance between molten steel and the inner wall of the groove is reduced, and adhesion is prevented. The cooling circuit of the interlayer is made of copper pipes, and the cooling medium in the cooling circuit is water.
For an intermediate billet with the thickness of 25 mm-30 mm, the temperature of molten iron generated after the thermite reaction is about 1500 ℃, and the sealing mechanism 3 can reduce the temperature of the joint part 6 to 980-1050 ℃ within 10 seconds, so that the joint part 6 realizes firm metallurgical connection and simultaneously meets the temperature condition of entering the finishing mill 10 for rolling.
By adopting the scheme, the connecting system is simple, consists of the sealing mechanism 3 with the cooling function and the spraying mechanism 4 with adjustable spraying speed, spraying angle and spraying quantity, and has small occupied area and low maintenance cost. And by adopting a mature self-propagating high-temperature synthesis technology, the connection between the large-section and special-shaped section intermediate blank and different steel types can be realized quickly and stably, the connection mode is reliable, and the product range is greatly expanded. Meanwhile, because the intermediate billet is in a high-temperature state before connection, necessary temperature conditions are provided for thermit reaction, and the molten iron generated after the reaction is cooled to realize firm metallurgical connection, so that the connection strength is high. The iron oxide scale existing on the surface of the intermediate blank can affect the solid state connection effect, and the general intermediate blank connection mode needs to carry out the descaling process before connection, but the iron oxide is taken as a reactant to participate in the thermit reaction, so that the descaling process before connection is reduced, and the use amount of oxide in the welding powder 5 is saved.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (4)
1. A hot rolled strip endless rolling intermediate billet connecting system, which is characterized by comprising a roughing mill (7), a shearing machine (9), a connecting device and a finishing mill (10) which are sequentially arranged along a rolling line direction, wherein the connecting device comprises a sealing mechanism (3) and an injection mechanism (4), the shearing machine (9) is used for cutting the tail end of a preceding intermediate billet (2) and the head end of a subsequent intermediate billet (1) into flat end surfaces, the sealing mechanism (3) clamps the preceding intermediate billet (2) and the subsequent intermediate billet (1) and forms a connecting cavity with sealed periphery, the two flat end surfaces separated by a certain distance are sealed, an interlayer in the connecting device is provided with a cooling loop, the injection mechanism (4) is used for injecting welding powder (5) into the sealed two flat end surfaces at intervals, the high temperature of a plate billet is used for providing an aluminothermic reaction condition for the welding powder (5) to enable the welding powder (5) to generate molten iron to fill the intervals to form a joint (6), and the joint (6) is rapidly cooled by the cooling loop; the connecting chamber is provided with a closable cover plate;
the spraying mechanism (4) is provided with a plurality of spraying nozzles with adjustable spraying speed, spraying angle and spraying quantity, and the spraying nozzles are arranged at intervals along the width direction of the slab;
The welding powder (5) is a mixture of Al, fe 2O3 and Fe 3O4, wherein the volume ratio of the mixture of Fe 2O3 and Fe 3O4 is inversely proportional to the thickness of the plate blank oxide scale;
The welding powder (5) contains a slag former for separating Al 2O3 generated by aluminothermic reaction from molten iron, and the main components of the slag former are CaO, siO 2 and B 2O3;
The interlayer of the sealing mechanism (3) is arranged between an inner layer and an outer layer, the inner layer is made of copper plates, the outer layer is made of steel plates, the inner surface of the inner layer is coated with a plating layer added with nickel, chromium and tungsten alloy, the cooling circuit of the interlayer is made of copper tubes, and the internal cooling medium is water.
2. The hot rolled strip endless rolling intermediate billet connection system according to claim 1, characterized in that a hot coil box (8) is also provided between the roughing mill (7) and the shearing machine (9).
3. The hot-rolled strip headless rolling intermediate billet connection system according to claim 1, characterized in that a deburring machine (11) is also provided between the connection means and the finishing mill (10).
4. A joining method of endless rolled intermediate blanks of a hot rolled strip, which is based on the joining system of endless rolled intermediate blanks of a hot rolled strip according to any one of claims 1 to 3, characterized in that the two intermediate blanks (2) after the rough rolling process and the subsequent intermediate blank (1) conveyed immediately after the preceding intermediate blank (2) are joined end to end in a process before the finish rolling process in a continuous manner, wherein the two intermediate blanks are formed with straight end surfaces in the width direction thereof before the joining, and the straight end surfaces of the two intermediate blanks are aligned, spaced, closed, thermite reacted, melt joined, cooled in this order during the joining to achieve the joining;
The straight end face of the tail end of the preceding intermediate blank (2) and the straight end face of the head end of the following intermediate blank (1) are provided with straight faces which are parallel to each other and form a certain angle relative to the width direction of the plate blank;
Controlling the temperature of the slab before the thermit reaction to be 950-1050 ℃ and controlling the temperature of the cooled slab to be 950-1100 ℃;
the welding powder (5) and the head and tail ends of the high-temperature slab are subjected to aluminothermic reaction, and iron oxide skin on the surface of the slab can be used as a reactant to participate in the reaction, so that heat is instantaneously released and molten iron is generated to fill the connecting cavity and form a joint part (6); then, the connecting chamber cover plate is closed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010675468.6A CN111760912B (en) | 2020-07-14 | 2020-07-14 | Method and system for connecting endless rolling intermediate billets of hot rolled strip steel |
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| CN202010675468.6A CN111760912B (en) | 2020-07-14 | 2020-07-14 | Method and system for connecting endless rolling intermediate billets of hot rolled strip steel |
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| CN111760912B true CN111760912B (en) | 2024-06-04 |
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| CN113477710A (en) * | 2021-07-15 | 2021-10-08 | 中冶赛迪工程技术股份有限公司 | Connecting method and device for hot-rolled strip steel endless rolling intermediate billet |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5978275A (en) * | 1982-10-28 | 1984-05-07 | Shinto Paint Co Ltd | Adhesive composition for clad steel stock preparation |
| JPS61176487A (en) * | 1985-02-01 | 1986-08-08 | Ishikawajima Harima Heavy Ind Co Ltd | Joining device of rolled stock |
| JPH06198308A (en) * | 1993-01-11 | 1994-07-19 | Kawasaki Steel Corp | Method for joining billet in hot rolling |
| JPH07290111A (en) * | 1994-04-25 | 1995-11-07 | Nippon Steel Corp | Connecting method of material to be rolled in continuous hot rolling |
| US5814787A (en) * | 1993-01-28 | 1998-09-29 | Nippon Steel Corporation | Apparatus for welding steel bars in a continuous hot rolling process |
| CN102019325A (en) * | 2010-09-21 | 2011-04-20 | 北京科技大学 | Connecting method for endless-rolled intermediate billets of hot-rolled strip steel |
| WO2015128153A1 (en) * | 2014-02-25 | 2015-09-03 | Primetals Technologies Austria GmbH | Method for joining rolling products to be rolled by thermite welding |
| CN206046652U (en) * | 2016-09-26 | 2017-03-29 | 安阳合力创科冶金新技术股份有限公司 | The cold rolling straight steel bar production system of high speed |
| CN212442563U (en) * | 2020-07-14 | 2021-02-02 | 中冶赛迪工程技术股份有限公司 | Hot-rolled strip steel endless rolling intermediate billet connecting system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4577384A (en) * | 1984-04-27 | 1986-03-25 | Bricmont Francis H | Method for joining together heated workpieces for processing in a rolling mill |
| AT507663B1 (en) * | 2009-04-09 | 2010-07-15 | Siemens Vai Metals Tech Gmbh | METHOD AND DEVICE FOR PREPARING HOT ROLLING MATERIAL |
-
2020
- 2020-07-14 CN CN202010675468.6A patent/CN111760912B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5978275A (en) * | 1982-10-28 | 1984-05-07 | Shinto Paint Co Ltd | Adhesive composition for clad steel stock preparation |
| JPS61176487A (en) * | 1985-02-01 | 1986-08-08 | Ishikawajima Harima Heavy Ind Co Ltd | Joining device of rolled stock |
| JPH06198308A (en) * | 1993-01-11 | 1994-07-19 | Kawasaki Steel Corp | Method for joining billet in hot rolling |
| US5814787A (en) * | 1993-01-28 | 1998-09-29 | Nippon Steel Corporation | Apparatus for welding steel bars in a continuous hot rolling process |
| JPH07290111A (en) * | 1994-04-25 | 1995-11-07 | Nippon Steel Corp | Connecting method of material to be rolled in continuous hot rolling |
| CN102019325A (en) * | 2010-09-21 | 2011-04-20 | 北京科技大学 | Connecting method for endless-rolled intermediate billets of hot-rolled strip steel |
| WO2015128153A1 (en) * | 2014-02-25 | 2015-09-03 | Primetals Technologies Austria GmbH | Method for joining rolling products to be rolled by thermite welding |
| CN206046652U (en) * | 2016-09-26 | 2017-03-29 | 安阳合力创科冶金新技术股份有限公司 | The cold rolling straight steel bar production system of high speed |
| CN212442563U (en) * | 2020-07-14 | 2021-02-02 | 中冶赛迪工程技术股份有限公司 | Hot-rolled strip steel endless rolling intermediate billet connecting system |
Non-Patent Citations (1)
| Title |
|---|
| 热轧带钢轧制的最新技术──无头轧制;张秀芳, 白云阶, 张心白, 李汉俊;轧钢;19971230(第06期);全文 * |
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