CN113000600A - Full-scale bar system and control method - Google Patents
Full-scale bar system and control method Download PDFInfo
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- CN113000600A CN113000600A CN202110180001.9A CN202110180001A CN113000600A CN 113000600 A CN113000600 A CN 113000600A CN 202110180001 A CN202110180001 A CN 202110180001A CN 113000600 A CN113000600 A CN 113000600A
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000005096 rolling process Methods 0.000 claims abstract description 191
- 238000009749 continuous casting Methods 0.000 claims abstract description 125
- 238000001816 cooling Methods 0.000 claims abstract description 73
- 238000005520 cutting process Methods 0.000 claims abstract description 70
- 238000004513 sizing Methods 0.000 claims abstract description 61
- 238000010438 heat treatment Methods 0.000 claims abstract description 41
- 238000004519 manufacturing process Methods 0.000 claims abstract description 41
- 238000005266 casting Methods 0.000 claims abstract description 25
- 238000010008 shearing Methods 0.000 claims abstract description 22
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 238000004364 calculation method Methods 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 238000005303 weighing Methods 0.000 claims description 11
- 230000005674 electromagnetic induction Effects 0.000 claims description 7
- 238000010276 construction Methods 0.000 abstract description 3
- 238000009776 industrial production Methods 0.000 abstract description 3
- 230000011218 segmentation Effects 0.000 abstract description 3
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 26
- 239000010959 steel Substances 0.000 description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 230000008901 benefit Effects 0.000 description 11
- 238000005299 abrasion Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 238000002372 labelling Methods 0.000 description 5
- 229910000997 High-speed steel Inorganic materials 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
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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
- B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of 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
- B21B45/004—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
- 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
- B21B2015/0014—Cutting or shearing the product transversely to the rolling direction
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Abstract
The invention belongs to the technical field of bar production in the ferrous metallurgy industry, and provides a full-scale bar system and a control method, wherein the control method comprises the following steps: carrying out fixed length and fixed weight measurement and calculation on the continuously cast casting blank; performing size and weight rechecking on the intermediate blank after the intermediate rolling; performing head cutting and tail cutting of a double-length on the rolled piece after pre-finish rolling; and (3) performing double-length shearing on the finish-rolled bar and controlling the double-length of the tail section to be five times or more than the target fixed length. The full-scale system comprises a continuous casting machine, a hydraulic sizing shear, a heating furnace, a roughing mill set, a head cutting flying shear after roughing, a middle mill set, a head cutting flying shear and a tail cutting flying shear before pre-finish rolling, a pre-finish rolling segmentation set, a head cutting flying shear and a tail cutting flying shear after pre-finish rolling, a high-speed bar finishing mill set, a scale flying shear, a cooling bed and the like, wherein a continuous casting billet sizing unit and a continuous casting billet sizing unit are arranged between the hydraulic sizing shear and the heating furnace, and a middle billet sizing unit is arranged on the middle mill set. The invention has low construction and production cost, less operators and easy realization of industrial production.
Description
Technical Field
The invention belongs to the technical field of bar production in the ferrous metallurgy industry, and particularly relates to a full-scale bar system and a control method.
Background
The bar is one of the most important products in the steel industry, the main products of the bar comprise a deformed steel bar and a round steel bar, and the bar is widely applied to the industries of buildings, bridges, machinery, automobiles, metal products and the like. In recent years, the yield is continuously increased, and the yield reaches 3.47 hundred million tons in 2019, and the yield reaches 34.84 percent of the total amount of steel in China. The yield of the thread steel in the bar is the maximum, and accounts for 78.26 percent of the yield of the straight bar.
The bar rolling production process mainly comprises the following steps: the method comprises the following steps of hot feeding and hot charging of continuous casting billets, heating of a heating furnace, rolling of a rough and medium finishing mill set, head and tail cutting of flying shears behind the rolling mill set, cooling of water tanks in front and at the back of the finishing mill set, rolling of a reducing and sizing mill set, cooling control after reducing and sizing, shearing of double-length flying shears, cooling of a cooling bed, cold shearing and sizing, non-sizing collection, collection through a cross-frame, counting, alignment, bundling and labeling, weighing and the like. When producing deformed steel bar, especially small-sized products, a slitting rolling production process can be adopted to improve the hourly output. And part steel mills adopt a high-speed steel feeding system to produce deformed steel bars and ordinary round steel bars, and the main rolling production flow comprises the following steps: the method comprises the following steps of hot feeding and hot charging of continuous casting billets, heating of a heating furnace, rolling of a rough and medium finishing mill set, flying shear head and tail cutting after the rolling mill set, cooling of front and rear water tanks of a finishing mill set, rolling of a high-rod finishing mill set, control cooling after the high-rod finishing mill set, shearing of a double-length flying shear, cooling of a cooling bed, cold shear sizing shearing, non-sizing collection, cross-frame collection, counting, alignment, bundling and labeling, weighing and the like. However, for small-sized bar products, due to the limitation of bar production speed, hourly output is limited, and therefore, a split double high bar production mode is adopted when rolling part of the small-sized products.
No matter the bar is cut or the double-high bar is delivered in a straight bar state, a finished straight bar product is generally delivered in specifications of 9m, 12m, 16m and the like, when the bar is rolled, the blank is a fixed-length blank, the fixed-length of the blank is generally 9 m-12 m, and the total length of the rolled bar is non-integral multiple of the fixed length of the finished product. In the tables 1 and 2, the tables for calculating the multiple lengths and the tail lengths of the bars produced by the slitting rolling and the high-speed bar rolling show that when the standard billet of 150mm × 150mm is slit to produce a fixed length of 12m, short lengths of 7.44m, 8.83m, 6.49m, 3.62m, 5.68m and 9.72m appear; when the standard billet with the size of 160mm multiplied by 160mm is cut to produce the fixed length of 12m, short lengths of 5.85m, 7.06m, 6.90m, 5.30m, 6.41m and 8.92m can appear; when the standard billet high-speed bar material with the size of 12m is produced according to the standard billet high-speed bar material with the size of 150mm multiplied by 150mm, short lengths of 2.87m, 5.66m, 0.98m, 11.43m, 5.03m and 7.44m can appear; short lengths of 11.70m, 2.12m, 1.80m, 7.94m, 7.22m and 5.85m occur when producing a 12m gauge length from a 160mm by 160mm standard billet high speed bar.
Therefore, the following problems exist in the production process of the common deformed steel bar slitting bar and the production process of the high-speed bar: firstly, the blank size provided by the upstream continuous casting process has certain deviation; secondly, the crystallizer in the continuous casting process is gradually worn along with the increase of the steel passing amount, so that the size of the blank is continuously changed; thirdly, the heating temperature and the heating time of the heating furnace are different, and the burning loss amount of the iron oxide scale is different; fourthly, the rollers bounce in the rolling process, so that the size of an outlet generates deviation; fifthly, the size of an outlet is continuously changed due to abrasion of the hole shape of the roller in the rolling process; sixthly, in the splitting rolling process, line differences exist among multiple lines; and seventhly, the flying shear cuts the head and the tail in the rolling process, wherein the lengths of the head and the tail are different. All the factors can cause the length of the finished bar to deviate, the number of the finished products in non-fixed length is increased, and by combining the table 1 and the table 2, the ratio of the metal yield rate is affected by the non-fixed length to reach 2.26 percent, and the number of the finished products in non-fixed length is more due to the change of the length of the finished products caused by the factors, so that the yield rate is further affected. The increase of short length brought by production not only leads to the yield to descend, can increase follow-up finishing process work load moreover, increases human cost and cost of enterprises.
In order to solve the problem of non-sizing in the production process, part of enterprises adopt a continuous casting and rolling technology, namely single-flow continuous casting, directly enters a rolling mill for rolling without casting blank sizing, and because no casting blank is sheared and rolled head and tail exist, the non-sizing phenomenon does not exist, however, the production technology has the defects that the yield of a production line is low, the continuous casting process and the rolling process are in hard connection, the utilization rate of production line equipment is low, and the production line cannot be well adapted to the large-scale large-batch steel market of China, the single-line yield of the current production line is generally 50 ten thousand t/year, the size of a continuous casting billet needs to be greatly improved for improving the yield of the production line, so that the compression ratio is improved, the number of rolling mills is correspondingly increased, the length of the. And some enterprises adopt a headless welding and rolling technology, namely two continuous casting billets are welded head and tail to realize headless and headless rolling, but the production mode has the problems that the structure performance of a welding point is unstable, the welding point is different from a matrix, the power of a headless welding unit is high, energy is greatly wasted, the yield of finished metal is low, and the like.
On the premise of ensuring the yield of a production line, the method can reduce or even eliminate non-fixed length and short length, improve the metal yield, reduce the labor intensity of field operators and reduce the operation cost of enterprises, and is the target pursued by bar enterprises. Aiming at the problems of more non-fixed length and short length, low metal yield and high labor intensity of field operators in the prior bar production, the invention provides a full multi-length system and a control method for bars, which can greatly reduce the non-fixed length proportion, even eliminate the non-fixed length, reduce the investment cost and improve the production stability on the premise of ensuring the production line yield, thereby improving the metal yield and the utilization rate of a rolling mill, reducing the labor intensity of the field operators, reducing the number of the field operators, reducing the operation cost and improving the economic benefit.
Disclosure of Invention
In view of the above, the present invention aims to provide a full-scale bar system and a control method, which are simple and convenient to control, low in construction cost, easy to implement industrial production, and have obvious economic benefits, and aims to solve the non-scale problem in the production process.
The invention is realized by the following technical scheme:
the invention provides a control method, which is characterized by comprising the following steps: B1) carrying out fixed length and fixed weight measurement and calculation on the continuously cast casting blank; B2) checking the size and weight of the intermediate blank after the intermediate rolling; B3) performing head cutting and tail cutting of multiple length on the pre-finish rolled piece; B4) and performing double-length shearing on the bar after finish rolling and controlling the double-length of the tail section of the bar to be five times or more than the target fixed length.
Preferably, in B1), the casting blank sizing and re-sizing data are tracked in real time by using the continuous casting machine crystallizer wear model and the continuous casting machine secondary cooling model, so as to control the quality, temperature and dimensional accuracy of the next casting blank.
Preferably, in B2), the size of the intermediate billet after intermediate rolling is acquired, and then the weight of the intermediate billet is calculated by combining the speed parameters of the last stand of the intermediate mill train.
Preferably, in B2), the intermediate billet size after intermediate rolling is acquired, and the double length determination is performed on the intermediate billet to re-size the next cast slab.
Preferably, in B3), the length of the crop end having the double length after the pre-finish rolling is calculated based on the size and weight of the intermediate slab rechecked in B2) in combination with the length of the crop end of the intermediate slab after the rough rolling, the length of the crop end and the crop end of the intermediate slab before the pre-finish rolling, and the length of the crop end of the rolled piece after the pre-finish rolling, wherein: the length of the head of the intermediate billet after rough rolling, the length of the head and tail of the intermediate billet before pre-finish rolling and the length of the head of the rolled piece after pre-finish rolling are all set according to the process requirements.
Preferably, in B4), the pass wear model of the finishing mill is compared with the measurement results of the dimensional accuracy of the bar, and the roll gap adjustment on line of the finishing mill train is performed to re-size the next cast slab.
Preferably, in B4), if the multiple length of the end section of the bar is less than five times of the target fixed length, the two-section or three-section multiple length of the reciprocal of the bar needs to be adjusted so that the multiple length is five times or more of the target fixed length.
The invention also provides a bar full-scale system which comprises a continuous casting machine, a hydraulic sizing shear, a heating furnace, a roughing mill group, a head cutting flying shear after roughing, a middle mill group, a water cooling tank and a return section before pre-finishing, a head cutting flying shear and a tail cutting flying shear before pre-finishing, a pre-finishing mill group, a water cooling tank and a return section after pre-finishing, a head cutting flying shear and a tail cutting flying shear after pre-finishing, a finishing mill group, a water cooling tank and a return section after finishing mill group, a scale flying shear, a tail clamping brake, a rotating hub, a cooling bed output roller bed, a sizing cold shear and a finished product collecting device which are arranged on a bar rolling production line, wherein the control method is realized.
Further, the continuous casting machine adopts a multi-machine multi-flow type square billet continuous casting machine; the continuous casting billet sizing unit and the intermediate billet sizing unit adopt hot metal detectors, and the continuous casting billet weighing unit adopts a weighing instrument.
Furthermore, the heating furnace is replaced by an electromagnetic induction concurrent heating system, and the head-tail temperature difference of the continuously cast bloom after concurrent heating is less than or equal to 50 ℃.
Furthermore, the inlet temperature of the pre-finishing mill group is 850-950 ℃, and the inlet temperature of the finishing mill group is 750-850 ℃.
Further, the system adopts a small-specification split double-line or large-specification single-line rolling with negative deviation when the deformed steel bar is finish rolled.
Further, the multiple length flying shear can reach a cooling bed based on the multiple length of the last bar during cutting, the multiple length is more than or equal to five times of the target fixed length, and multiple length allocation can be carried out on 2-3 bars with the reciprocal number.
Furthermore, the system also comprises a continuous casting machine crystallizer abrasion model and a continuous casting machine secondary cooling model, so that the fixed-length and fixed-weight measurement and calculation data of the casting blank are tracked in real time to control the quality, temperature and size precision of the next casting blank; the method also comprises a finish rolling mill hole pattern wear model to re-size the next casting blank; and the intermediate billet sizing unit judges the length of the intermediate billet in multiple scales according to the size of the intermediate billet after the intermediate rolling so as to re-size the next casting blank.
The working principle of the bar full-scale system is as follows:
1) continuous casting: continuous casting is carried out by adopting a multi-machine multi-strand square billet continuous casting machine, if the section size of the continuous casting billet is 150mm multiplied by 150 mm-180 mm multiplied by 180mm, the continuous casting billet is subjected to fixed-length cutting by hydraulic fixed-length shears after being cooled in a continuous casting secondary cooling area and straightened by a withdrawal and straightening machine;
2) sizing and weighing of the continuous casting blank: measuring the section size and the continuous casting billet length of each continuous casting billet by a continuous casting billet sizing unit after cutting, calculating the weight of the continuous casting billet according to the size parameters, measuring the weight of the continuous casting billet by a continuous casting billet sizing unit, comparing the measured weight with the previously calculated weight, correcting the weight of the continuous casting billet calculated by the size parameters, giving a signal if the size precision of the final continuous casting billet does not meet the process requirements, and replacing a continuous casting crystallizer;
3) heating or concurrent heating of continuous casting billets: if a direct rolling process is adopted, after the continuous casting billet treated in the step 2) is conveyed by a heat-preservation quick roller way, frequency conversion or variable power electromagnetic induction heat compensation is carried out according to the head and tail temperature of the continuous casting billet so as to meet the requirements of the rolling process; if a heating furnace is adopted for heating, the temperature of a casting blank is heated and kept warm by multi-stage heating control in the heating furnace, and after the two heating modes, the temperature of the continuous casting blank is 900-1250 ℃, and the temperature difference between the head and the tail is less than or equal to 50 ℃;
4) rolling by a rough and medium rolling mill set: performing multi-pass rolling on the square billet heated in the step 3) by adopting a horizontal-vertical alternative or flat-roll rolling mode, wherein when a roughing mill set is used for rolling, hole-free rolling and hole-pass rolling can be adopted, when the hole-pass rolling is adopted, the roughing mill set is a box-ellipse-round hole system, when the hole-pass rolling is adopted, a guide and guard are arranged at the front and the rear of each rolling mill, a flying shear is arranged behind the roughing mill set for cutting the head, and a flying shear is arranged behind a middle rolling mill set for cutting the head and the tail;
5) detecting a middle blank after the middle rolling mill set and performing multiple length accounting: detecting the intermediate blank after the flying shears cut at the head and the tail after the intermediate rolling in the step 4) by adopting a hot metal detector, calculating the weight of the intermediate blank at the moment according to the material type parameter and the rolling speed of the last frame of the intermediate rolling mill set, and calculating the weight of a rolled piece, the final finished product length and a multiple cutting control scheme according to a full multiple system;
6) controlling cooling and rolling in front and at back of a pre-finishing mill set: carrying out water tank cooling and air cooling section reversion before pre-finish rolling on the rolled piece treated in the step 5), then carrying out rolling of a pre-finishing mill set, and carrying out water cooling temperature control after the rolling of the pre-finishing mill set so as to ensure that the temperature of the rolled piece entering a finishing mill set meets the process requirements;
7) pre-finishing mill set front flying shear cutting: and 6) performing head cutting and tail cutting treatment on the rolled piece in the step 6). When cutting the head, setting the length of the cutting head according to the process requirement; during tail cutting, calculating the tail cutting length according to the weight of the rolled piece calculated in the step 5), the material type size of the rolled piece subjected to pre-finish rolling in the step 6) and the length of the cut head, and ensuring that the cut rolled piece has the length of multiple lengths;
8) rolling and controlled cooling after rolling by a finishing mill set: carrying out finish rolling unit rolling on the rolled piece treated in the step 7), carrying out controlled cooling after rolling, carrying out online roll gap adjustment according to a measurement result of the size precision of a finished product after hole patterns are worn, and adopting a way of inter-pass adjustment to ensure the product strip passing property during adjustment;
9) cutting at multiple scales: after passing through a pinch roll before the high-speed flying shear, the rolled piece processed in the step 8) is subjected to multiple-length shearing by using a fixed-length high-speed flying shear, and then the rolled piece is conveyed into a guide groove by the pinch roll after passing through the high-speed flying shear respectively, and the rolled piece is conveyed, if the multiple-length of the last section is five times or more than the final fixed length, the rolled piece is sheared according to the length of a cooling bed during multiple-length shearing, and optimization is not needed; if the length of the last section is less than five times of the final fixed length, optimized shearing is needed, namely the length of the multiple length during the shearing of the third section and the second section from the last and the length of the last section are optimized, so that the requirement that the length of the multiple length is more than five times of the fixed length is met, and the requirement of the upper cooling bed process is met;
10) high-speed steel feeding: conveying the rods subjected to multi-length shearing in the step 9) to a cooling bed through a double-channel guide groove, and cooling rolled pieces falling onto a rack of the cooling bed through a tail clamping brake and a rotating hub;
11) sizing and collecting: and (3) carrying out fixed-length cold shearing on the bar cooled by the cooling bed in the step 10), collecting, counting, bundling, labeling and weighing by using a cross inspection rack, and then transporting the bar to a finished product warehouse by using a crown block or a horizontal plane vehicle for collection.
The invention has the advantages that:
1. compared with the common slitting bar production line and the high-speed bar production line, the full-multiple-length bar system fully considers the abrasion of a continuous casting crystallizer, the abrasion of a roll pass and the shearing head and tail length of a flying shear, can greatly reduce the non-fixed-length proportion, greatly reduce short-length bars and non-multiple-length bars, even eliminate the non-fixed-length bars, has high calculation precision and low investment cost, improves the production stability, improves the metal yield and the utilization rate of a rolling mill, reduces the labor intensity of field operators, has low equipment failure rate, reduces the number of the field operators, reduces the operation cost and improves the economic benefit.
2. The invention combines a continuous casting billet sizing unit, a continuous casting billet weight-fixing unit, a continuous casting machine crystallizer abrasion model, a continuous casting machine secondary cooling model in a cooling state in a continuous casting cooling process, intermediate billet size detection, weight rechecking and double-length judgment after intermediate rolling, double-length cutting guarantee of head and tail cutting after pre-finish rolling, a finishing mill hole pattern abrasion model with online roll gap adjustment to jointly realize a closed-loop full-length technology, and the double-length of the last bar can be cooled on a cooling bed. The control system and the control method have the advantages of low construction cost, low production cost, few operators, easy realization of industrial production and obvious economic benefit.
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 objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:
fig. 1 is a bar full-scale system and control method layout diagram (small-scale two-division) of the invention.
FIG. 2 is a bar full-scale system and control method layout diagram (large scale non-splitting) of the present invention.
Fig. 3 is a schematic diagram of a full multi-length rod system and a control method of the invention.
Reference numerals: the device comprises a continuous casting machine 1, a hydraulic sizing shear 2, a continuous casting billet sizing unit 3, a continuous casting billet sizing unit 4, a heating furnace 5, a roughing mill group 6, a roughing mill group 7, a roughing post-crop flying shear 8, a middle mill group, a pre-finishing pre-rolling pre-cooling water tank and a return section 9, a pre-finishing pre-rolling pre-crop flying shear 10, a pre-finishing pre-rolling pre-finishing mill group 11, a pre-finishing mill splitting group 11', a pre-finishing post-cooling water tank and a return section 12(121, 122), a pre-finishing post-cooling water tank and a return section 13(131, 132), a pre-finishing post-crop flying shear and a tail-cutting flying shear 14(141, 142), a finishing mill group 15(151, 152), a finishing mill post-cooling water tank and a return section 16, a double-length flying shear 17, a tail clamping brake 18, a rotating hub 19, a cooling bed 20, a cooling bed output roller table 21, a sizing shear 22, a finished product collecting device 22 and an intermediate billet sizing unit 23.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
As shown in fig. 2, the full-multiple-length system for bars according to the present invention includes a continuous caster 1, a hydraulic sizing shear 2, a continuous casting sizing unit 3, a continuous casting weighting unit 4, a heating furnace 5, a roughing mill unit 6, a roughing post-cropping flying shear 7, a middle mill unit 8, a pre-finishing pre-chill box and recovery section 9, a pre-finishing pre-crop head and tail-cropping flying shear 10, a pre-finishing mill unit 11, a pre-finishing post-cropping water chill box and recovery section 12, a pre-finishing post-cropping head and tail-cropping flying shear 13, a finishing mill unit 14, a finishing mill post-chill box and recovery section 15, a multiple-length flying shear 16, a tail-clipping brake 17, a rotating hub 18, a cooling bed 19, a cooling bed run-out table 20, a sizing shear 21, a finished product collecting device 22, and an intermediate billet sizing unit 23, which are disposed on a bar rolling production line. The continuous casting billet sizing unit 3 and the continuous casting billet weight determining unit 4 are used for sizing and weight determining of a continuously cast casting billet, and the intermediate billet sizing unit 23 is arranged on the intermediate mill unit and used for detecting the size of the intermediate billet and calculating the weight of the intermediate billet according to the detected size.
The continuous casting machine 1 in the embodiment adopts a multi-machine multi-flow type square billet continuous casting machine; the continuous casting billet sizing unit 3 and the intermediate billet sizing unit 23 can adopt hot metal detectors, and the continuous casting billet weight determining unit 4 adopts a weighing instrument.
The heating furnace in the embodiment can be replaced by an electromagnetic induction concurrent heating system, and the head-to-tail temperature difference of the continuous casting billet subjected to concurrent heating by the heating furnace or the electromagnetic induction concurrent heating system is less than or equal to 50 ℃.
The pre-finishing rolling mill group 11 in this embodiment performs a single-line rolling of a large specification, and may also include a splitting device to form a pre-finishing splitting mill group 11', such as a two-split rolling of a small specification shown in fig. 1; and the inlet temperature of the pre-finishing mill group 11 or the pre-finishing mill splitting group 11' is 850 ℃ to 950 ℃, and the inlet temperature of the finishing mill group 14 is 750 ℃ to 850 ℃.
The present system in this example uses a negatively biased small gauge slit twin-wire rolling or a large gauge single-wire rolling when finish rolling deformed steel bars.
In the embodiment, the multiple-length flying shears 16 can move to the cooling bed based on the multiple length of the last bar during cutting, the multiple length is not less than 5 times of the target fixed length, and multiple length allocation can be performed on 2-3 bars with the reciprocal number.
The system in the embodiment also comprises a continuous casting machine crystallizer abrasion model and a continuous casting machine secondary cooling model, so that the fixed-length and fixed-weight measurement and calculation data of the casting blank are tracked in real time to control the quality, temperature and size precision of the next casting blank; the method also comprises a finish rolling mill hole pattern wear model to re-size the next casting blank; and the intermediate billet sizing unit judges the length of the intermediate billet in multiple scales according to the size of the intermediate billet after the intermediate rolling so as to re-size the next casting blank.
Example 1(165 mm. times.165 mm continuous casting slab producing phi 12mm deformed steel bar)
Referring to fig. 1 and 3, table 3 and table 5 according to the present invention, the production process sequence comprises the following:
1) continuous casting: adopting a four-machine four-flow square billet continuous casting machine 1 to carry out 20MnSi continuous casting, wherein the continuous casting drawing speed is 4.0m/min, the section size of the continuous casting billet is 165mm multiplied by 165mm, carrying out fixed-length cutting on the continuous casting billet by a hydraulic fixed-length shear 2 after cooling in a continuous casting secondary cooling area and straightening by a straightening machine, and the size parameter of the cut casting billet is 165mm (width) multiplied by 165mm (height) multiplied by 12000 (length);
2) sizing the continuous casting blank: sequentially feeding the continuous casting billets cut to length in the step 1) into respective corresponding continuous casting billet length determining units 3 for measurement, such as a hot metal detector, correcting the size of the cross section of the four-flow continuous casting billet after measurement to be 165.03mm (width) x 165.03mm (height) x 12005 (length), and calculating the weight of the continuous casting billet to be 2.52t according to the size parameters;
3) weight fixing of the continuous casting billet: carrying out measurement and accounting on the continuous casting billet subjected to the sizing measurement in the step 2) by a continuous casting billet sizing unit 4, wherein the weight of the continuous casting billet is 2.52t after the measurement;
4) heating or concurrent heating of continuous casting billets: and (3) conveying the continuously cast bloom subjected to the fixed weight measurement in the step 3) through a heat-insulating quick roller way, and then performing electromagnetic induction heat compensation (or a heating furnace 5), wherein variable-frequency or variable-power heat compensation is adopted in the heat compensation process so as to meet the requirements of the rolling process. After heating, the temperature of the continuous casting billet is 950 +/-50 ℃, and the head-tail temperature difference is less than or equal to 50 ℃;
5) rough rolling and end cutting after rolling: carrying out six-pass rolling on the square billet heated in the step 4) by adopting a non-hole rolling mode, wherein the inlet speed of a roughing mill set is 0.34m/s, the outlet speed of the roughing mill set is 1.73m/s, the average elongation of the passes is 1.31, the outlet size of the roughing mill set 6 is 74mm multiplied by 74mm, the temperature of the rolled piece after roughing is 900-950 ℃, and after finishing the rolling of the roughing mill set, cutting the rolled piece by a head cutting flying shear 7 after roughing, wherein the length of the cut head is 80 mm;
6) intermediate rolling, detection and multiple length accounting of intermediate blanks after rolling: carrying out six-pass rolling by a middle rolling mill group 8 on the intermediate blank after rough rolling in the step 5) by adopting a box-type-ellipse-circle pass system, wherein guides and guards are arranged at the front and the rear of a rolling mill, the inlet speed of the middle rolling mill group is 1.73m/s, the outlet speed of the middle rolling mill group is 7.17m/s, the average elongation of the passes is 1.27, the outlet size of the middle rolling mill group is phi 41.0mm, the temperature of a rolled piece after middle rolling is 850-1000 ℃, carrying out size detection on the rolled piece after middle rolling by adopting a middle blank sizing unit 23 such as a hot metal detector, and calculating to obtain the weight 2.517t of the intermediate blank at the moment by combining with the speed parameter of a last section of a rack;
7) pre-finish rolling, cooling control and front flying shear cutting: feeding the rolled piece treated in the step 6) into a water cooling box and a return section 9 before pre-finish rolling; then the head and tail cutting treatment is carried out by a head and tail cutting flying shear 10 before pre-finish rolling. When cutting the head, the length of the cut head is 250mm, and the length of the cut tail is 100 mm;
8) pre-finish rolling and splitting rolling: the rolled piece enters a pre-finish rolling segmentation unit 11', the rolling pass is six passes, guides and guards are arranged at the front and the rear of the rolling mill, the inlet speed of the unit is 7.17m/s, the outlet speed is 17.06m/s, the average elongation of the passes is 1.16, the outlet size of the unit is phi 18.8mm multiplied by 2, the inlet temperature of the pre-finish rolling is 850-950 ℃, and the rolled piece enters a water cooling box and recovery sections 121 and 122 after the two passes of segmentation rolling respectively after the pre-finish rolling so as to ensure that the temperature of the rolled piece entering the finishing mill units 141 and 142 meets the rolling process requirement of 750-850 ℃;
9) cutting by flying shears after pre-finish rolling: and (3) respectively performing head cutting and tail cutting treatment on the two rolled pieces obtained in the step 8) through pre-finish rolling and head cutting and tail cutting flying shears 131 and 132. The length of the crop end is 200mm multiplied by 2, the length of the crop end of the rolled piece is 142 multiplied by 2mm according to the rolled piece weight calculated in the step 6), the material type size and the crop end length of the rolled piece after pre-finish rolling in the step 7) and the crop end length in the step 9), and cutting operation is carried out to ensure that the cut rolled piece has the length of multiple scales;
10) finish rolling and controlled cooling after rolling: carrying out double-line rolling on the two paths of rolled pieces processed in the step 9) by a finishing mill group 141 and 142, wherein the rolling pass of each line is four, the front and the back of the rolling mill are respectively provided with a guide, the inlet speed of the rolling mill group is 17.06m/s, the outlet speed of the rolling mill group is 40.78m/s, the average elongation of the pass is 1.24, the inlet temperature of the rolling mill group is 750-850 ℃, if the rolling of the deformed steel bar is carried out, negative deviation rolling can be adopted, and the rolled two paths of rolled pieces enter a water cooling box and return sections 151 and 152 of the finishing mill group for;
11) cutting at multiple scales: and (3) after the rolled piece processed in the step 10) passes through a pinch roll in front of a multi-length flying shear 16, carrying out multi-length shearing by using a multi-length flying shear with fixed length and high speed, wherein the length of a cooling bed 19 is 120m, the first 12 pieces are sheared by adopting 9 times of 12m fixed length at the moment, the 13 th piece is sheared by adopting 6 times of 12m fixed length at the time of the multi-length, and the 14 th piece (the last piece) is sheared by adopting 5 times of 12m fixed length, so that the fixed length is ensured, and the last multi-length piece can be cooled on the cooling bed. Or the first 11 pieces are cut by using 9 times of 12m fixed length, the second 12 pieces are cut by using 7 times of 12m fixed length, the third 13 pieces are cut by using 7 times of 12m fixed length, and the fourth 14 pieces (the last piece) are cut by using 6 times of 12m fixed length;
12) high-speed steel feeding: conveying the rolled piece subjected to multi-length shearing in the step 11) to a cooling bed 19, and cooling the rolled piece after the rolled piece passes through a tail clamping brake 17 and a rotating hub 18 and falls onto a rack of the cooling bed 19;
13) sizing and collecting: outputting the bar cooled by the cooling bed in the step 12) from a cooling bed output roller table 20, entering a fixed-length cold shear 21 for shearing, collecting, counting, bundling, labeling and weighing through a cross inspection rack, and transporting to a finished product collecting device 22 through a finished product warehouse crown block or a horizontal plane vehicle;
14) and (3) wear of a crystallizer: after the single-flow continuous casting machine passes through the steel for 2000t, the crystallizer is abraded, real-time tracking calculation is carried out through a continuous casting machine crystallizer abrasion model, and the steps 2) -13) are repeated;
15) wear of the hole pattern: and (3) after the single-line finishing mill group rolls for 800t, the hole pattern is worn, the next steel is subjected to online roll gap adjustment according to the measurement result of the size precision of the finished product and is continuously rolled, the step 7) -the step 9) are repeated in the multiple length calculation process, the multiple length is optimized, and the step 11) is repeated.
Example 2(165 mm. times.165 mm continuous casting slab production phi 20mm screw-thread steel)
Referring to fig. 2, fig. 3, table 4 and table 5 according to the present invention, the production process sequence comprises the following:
1) continuous casting: adopting a three-machine three-flow square billet continuous casting machine 1 to carry out 20MnSi continuous casting, wherein the continuous casting drawing speed is 4.1m/min, the section size of the continuous casting billet is 165mm multiplied by 165mm, carrying out fixed-length cutting on the continuous casting billet by a hydraulic fixed-length shear 2 after cooling in a continuous casting secondary cooling area and straightening by a withdrawal and straightening machine, and the size parameter of the cut casting billet is 165mm (width) multiplied by 165mm (height) multiplied by 12000 (length);
2) sizing the continuous casting blank: sequentially feeding the continuous casting billets cut to length in the step 1) into respective corresponding continuous casting billet sizing units 3 for measurement, correcting the size of the cross section of the continuous casting billets cut to length in the step 1 to be 165.03mm (width) x 165.03mm (height) x 12005 (length), and calculating the weight of the continuous casting billets to be 2.52t according to the size parameters;
3) the continuous casting billet is heavy: carrying out measurement and accounting on the continuous casting billet subjected to the sizing measurement in the step 2) by a continuous casting billet sizing unit 4, wherein the weight of the continuous casting billet is 2.52t after the measurement;
4) heating or concurrent heating of continuous casting billets: and (3) after the continuous casting billet subjected to the fixed weight measurement in the step 3) is conveyed through a heat-preservation quick roller way, heat compensation is carried out on the continuous casting billet by a heating furnace 5, and variable-frequency or variable-power heat compensation is adopted in the heat compensation process so as to meet the requirements of the rolling process. After heating, the temperature of the continuous casting billet is 950 +/-50 ℃, and the head-tail temperature difference is less than or equal to 50 ℃;
5) rough rolling and end cutting after rolling: the roughing mill group 6 is used for carrying out six-pass rolling on the square billet heated in the step 4) in a non-pass rolling mode, the inlet speed of the roughing mill group is 0.21m/s, the outlet speed of the roughing mill group is 1.05m/s, the average elongation of the passes is 1.31, the outlet size of the roughing mill group is 74mm multiplied by 74mm, the temperature of the rolled piece after roughing is 900-950 ℃, the rolled piece is cut by a head cutting flying shear 7 after roughing after finishing the rolling of the roughing mill group, and the length of the cut head is 80 mm;
6) intermediate rolling, detection and multiple length accounting of intermediate blanks after rolling: carrying out six-pass rolling by a middle rolling mill group 8 on the intermediate blank after rough rolling in the step 5) by adopting a box-ellipse-circle pass system, wherein guides and guards are arranged at the front and the rear of a rolling mill, the inlet speed of the middle rolling mill group is 1.05m/s, the outlet speed of the middle rolling mill group is 4.34m/s, the average pass elongation is 1.27, the outlet size of the middle rolling mill group is phi 41.0mm, the temperature of a rolled piece after middle rolling is 850-1000 ℃, carrying out size detection on the rolled piece after middle rolling by adopting a hot metal detector after middle rolling, and calculating to obtain the weight of the intermediate blank 2.517t by combining the speed parameter of a last section of a rack;
7) cutting by flying shears before pre-finish rolling: and (3) performing head cutting and tail cutting treatment on the rolled piece in the step 6) through a head cutting and tail cutting flying shear 10 before pre-finish rolling. When cutting the head, the length of the cut head is 250mm, and the length of the cut tail is 100 mm;
8) controlling cooling and rolling before pre-finish rolling: the rolled piece treated in the step 6) enters a water cooling tank and a return section 9 before pre-finish rolling, then a pre-finishing rolling unit 11 is used for rolling, the rolling pass is six passes, guides and guards are arranged at the front and the rear of the rolling mill, the inlet speed of the pre-finishing rolling unit is 4.34m/s, the outlet speed of the pre-finishing rolling unit is 11.22m/s, the average elongation of the pass is 1.27, the outlet size of the pre-finishing rolling unit is phi 25.5 mm, the inlet temperature of the pre-finish rolling is 850-950 ℃, and then the rolled piece enters a water cooling tank and a return section 12 after the pre-finish rolling so as to ensure that the temperature of the rolled piece entering a finishing rolling unit 14 meets the;
9) cutting by flying shears after pre-finish rolling: and (3) performing head cutting and tail cutting treatment on the rolled piece in the step 8) by using a pre-finish rolling head cutting and tail cutting flying shear 13. The length of the crop end is 400mm, the length of the crop end is 308mm according to the weight of the rolled piece calculated in the step 6), the material shape size and the crop end length of the rolled piece after pre-finish rolling in the step 7) and the length of the crop end calculated in the step 9), and cutting operation is carried out to ensure that the final finished product after the crop end is the length of multiple lengths;
10) finish rolling and controlled cooling after rolling: rolling the rolled piece treated in the step 9) by a finishing mill group 14, wherein the rolling passes are four passes, guides and guards are arranged before and after the rolling mill, the inlet speed of the finishing mill group is 11.22m/s, the outlet speed is 17.77m/s, the average elongation of the passes is 1.24, the finish rolling inlet temperature is 750-850 ℃, the deformed steel bar can be rolled by adopting negative deviation when being rolled, and the rolled piece is controlled and cooled by a rear water cooling box of the finishing mill group and a return section 15 after being rolled;
11) cutting at multiple scales: and (3) after the rolled piece processed in the step 10) passes through a pinch roll in front of the high-speed multi-length flying shear 16, carrying out multi-length shearing by using a fixed-length high-speed multi-length flying shear, wherein the length of a cooling bed 19 is 120m, the first 9 pieces are cut in fixed length of 9 times x 12m, the 10 th piece (the last piece) is cut in fixed length of 5 times x 12m, the fixed length is ensured, and the last multi-length piece can be cooled on the cooling bed. Or the first 8 pieces are cut by using the fixed length of 9 times 12m, the 9 th piece is cut by using the fixed length of 7 times 12m, and the 10 th piece (the last piece) is cut by using the remaining fixed length of 7 times 12 m;
12) high-speed steel feeding: conveying the rods subjected to multi-length shearing in the step 11) to a cooling bed 19, and allowing rolled pieces to fall onto racks of the cooling bed 19 through a tail clamping brake 17 and a rotating hub 18 and cooling;
13) sizing and collecting: and (3) feeding the bar cooled by the cooling bed in the step 12) into a sizing cold shear 21 for shearing through a cooling bed output roller way 20, collecting, counting, bundling, labeling and weighing through a cross inspection rack, and then transporting the bar to a finished product collecting device 22 through a finished product warehouse crown block or a horizontal plane vehicle.
14) And (3) wear of a crystallizer: after the uniflow continuous casting machine passes through the steel for 2000t, the crystallizer is abraded, real-time tracking calculation is carried out through a continuous casting machine crystallizer abrasion model, and the steps 2) -13) are repeated;
15) wear of the hole pattern: and (3) after the single-line finishing mill group rolls for 800t, the hole pattern is worn, the next steel is subjected to online roll gap adjustment according to the measurement result of the size precision of the finished product and is continuously rolled, the step 7) -the step 9) are repeated in the multiple length calculation process, the multiple length is optimized, and the step 11) is repeated.
The invention has the following advantages:
1) the flow number and the continuous casting speed of the continuous casting machine are matched with the rolling specification and speed, no wire blank is discharged, and the product yield is high;
2) the continuous casting machine is provided with a continuous casting machine crystallizer abrasion model and a continuous casting machine secondary cooling model in a cooling state in a continuous casting cooling process, and the working state and the casting blank state of the continuous casting machine can be monitored in real time;
3) after the continuous casting sizing cutting, a continuous casting blank sizing unit and a continuous casting blank weight unit are used for checking the size and the weight of the casting blank, and the calculation deviation is small;
4) the continuous casting billet is heated by an electromagnetic induction heat supplementing or heating furnace, and frequency conversion or variable power heat supplementing is adopted in the heat supplementing process, so that the head-tail temperature difference is small, and the product performance is stable;
5) the hot metal detector is adopted behind the intermediate mill unit to detect the size of the rolled piece after intermediate rolling, the weight of the intermediate blank is accurately calculated by combining the speed parameter of the end section of the frame, and the full-multiple-length system has high control precision;
6) the rear flying shear of the pre-finishing mill set cuts according to the full-multiple length requirement, the final finished product after tail cutting is ensured to be multiple length, and the cutting precision is high;
7) the product has wide production specification range, and can produce all deformed steel bars in the specification range of phi 6.0mm to phi 50.0mm and all round steel bar products in the specification range of phi 16.0mm to phi 90.0 mm; the small specification adopts slitting rolling, the large specification adopts single rolling, and the production is flexible;
8) the finishing mill group adopts a single rolling method, the product size precision is high, the deformed steel bar negative deviation rolling can be realized, and the metal yield is improved;
9) the multi-length shearing is based on shearing data of rough rolling rear flying shears, middle rolling rear flying shears and pre-finish rolling rear flying shears, and system optimization is carried out on 2-3 reciprocal multi-lengths in consideration of the requirement of multi-length steel feeding, so that the production is stable and reliable;
10) the wear of the crystallizer and the wear of the hole pattern are considered, the online roll gap adjustment can be realized, the production is flexible, and the product size precision is high;
11) the production line has high yield, high hourly output of the production line, high rolling mill efficiency of the production line, full-scale and fixed length, small temperature difference between the head and the tail of the bar, uniform size and stable performance;
12) the unmanned operation of the finishing area can be realized, and the labor cost is greatly reduced.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and it is apparent that those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A control method of a bar full-scale system is characterized by comprising the following steps:
B1) carrying out fixed length and fixed weight measurement and calculation on the continuously cast casting blank;
B2) checking the size and weight of the intermediate blank after the intermediate rolling;
B3) performing head cutting and tail cutting of multiple length on the pre-finish rolled piece;
B4) and performing double-length shearing on the bar after finish rolling and controlling the double-length of the tail section of the bar to be five times or more than the target fixed length.
2. The control method according to claim 1, wherein in B1), the measured length and the measured weight of the casting slab are tracked in real time by using the continuous casting machine crystallizer wear model and the continuous casting machine secondary cooling model to control the quality, the temperature and the dimensional accuracy of the next casting slab.
3. The control method according to claim 1, characterized in that in B2), the intermediate billet size after intermediate rolling is obtained, and then the intermediate billet weight is calculated by combining the speed parameters of the last stand of the intermediate mill train.
4. The control method according to claim 1, wherein in B2), the obtained intermediate slab size is used to perform double length determination on the intermediate slab for re-sizing the next cast slab.
5. The control method according to claim 1, wherein in B3), the length of the double-length crop of the pre-finish rolled stock is calculated from the size and weight of the intermediate slab rechecked in B2) in combination with the length of the crop of the intermediate slab after rough rolling, the lengths of the crop and the crop of the intermediate slab before pre-finish rolling, and the length of the crop of the rolled stock after pre-finish rolling, wherein: the length of the head of the intermediate billet after rough rolling, the length of the head and tail of the intermediate billet before pre-finish rolling and the length of the head of the rolled piece after pre-finish rolling are all set according to the process requirements.
6. The control method according to claim 1, wherein in B4), the finish mill pass wear model is compared with the bar dimensional accuracy measurements and on-line roll gap adjustment of the finish mill train is performed to re-size the next cast slab.
7. The control method according to claim 1, wherein in B4), if the multiple length of the tail section of the bar is less than five times of the target fixed length, the two or three sections of the multiple length of the reciprocal bar are required to be adjusted and sheared, so that the multiple length is five times and more than the target fixed length.
8. A full-multiple-length system of bars comprises a continuous casting machine (1), a hydraulic fixed-length shear (2), a heating furnace (5), a roughing mill group (6), a roughing post-crop flying shear (7), a middle mill group (8), a pre-finishing pre-finish-rolling pre-chill box and return section (9), a pre-finishing pre-crop flying shear (10), a pre-finishing mill group (11), a pre-finishing post-chill box and return section (12), a pre-finishing post-crop flying shear (13), a finishing mill group (14), a finishing mill post-chill box and return section (15), multiple-length flying shears (16), a tail clamping brake (17), a rotating hub (18), a cooling bed (19), a cooling bed output roller bed (20), a fixed-length cold shear (21) and a finished product collecting device (22) which are arranged on a bar rolling production line, and is characterized in that the control method of any one of claims 1-7 is realized, a continuous casting blank sizing unit (3) for measuring the size of a casting blank and a continuous casting blank sizing unit (4) for measuring the weight of the casting blank are arranged between the hydraulic sizing shears and the heating furnace, and an intermediate blank sizing unit (23) for measuring the size of an intermediate blank is arranged on the intermediate mill unit.
9. The full multi-length bar system according to claim 1, wherein the continuous casting machine is a multi-machine multi-flow billet continuous casting machine; the continuous casting billet sizing unit and the intermediate billet sizing unit adopt hot metal detectors, and the continuous casting billet weighing unit adopts a weighing instrument.
10. The full-length system of bars according to claim 1, wherein the heating furnace is replaced by an electromagnetic induction concurrent heating system, and the temperature difference between the head and the tail of the continuously cast slab after concurrent heating is less than or equal to 50 ℃.
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