AU2006228889B2 - A continuous casting and rolling method for medium plate - Google Patents

A continuous casting and rolling method for medium plate Download PDF

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Publication number
AU2006228889B2
AU2006228889B2 AU2006228889A AU2006228889A AU2006228889B2 AU 2006228889 B2 AU2006228889 B2 AU 2006228889B2 AU 2006228889 A AU2006228889 A AU 2006228889A AU 2006228889 A AU2006228889 A AU 2006228889A AU 2006228889 B2 AU2006228889 B2 AU 2006228889B2
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Prior art keywords
rolling
billet
roller
continuous casting
firstly
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AU2006228889A
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AU2006228889A1 (en
Inventor
Hao Dong Huang
Fu Xing Jin
Long Zhen Li
Jie Liu
Yong Gang Ma
Jie Fu Na
Xiao Chun Sha
Yi Kang Sun
Ming Ren Wang
Xu Yang
Heng Lu Zhang
Leng Zhang
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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Priority to CN200510046133.3 priority Critical
Priority to CNA2005100461333A priority patent/CN1840252A/en
Application filed by Angang Steel Co Ltd filed Critical Angang Steel Co Ltd
Priority to PCT/CN2006/000518 priority patent/WO2006102835A1/en
Publication of AU2006228889A1 publication Critical patent/AU2006228889A1/en
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Publication of AU2006228889B2 publication Critical patent/AU2006228889B2/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-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
    • B21B1/46Metal-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 metal immediately subsequent to continuous casting
    • B21B1/463Metal-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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B13/00Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/22Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories for rolling metal immediately subsequent to continuous casting, i.e. in-line rolling of steel
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B45/00Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203Cooling
    • B21B45/0209Cooling devices, e.g. using gaseous coolants
    • B21B45/0215Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates

Description

OP07080527 A CONTINUOUS CASTING AND ROLLING METHOD FOR MEDIUM PLATE Field of the invention The application belongs to metallurgical metal processing field, more specifically relates to a continuous casting and rolling process for medium plate. Description of the related art Now, the producing technique of continuous hot rolling plate is mainly divided into traditional process and CSP process. The traditional process comprise continuous casting thick billet with thickness of 200mm-250mm, flame cutting, heating by walking-beam furnace, descaling, rolling by rough rolling group, shearing, descaling, rolling by finishing rolling train, stream cooling, coiling. Although this process has advantages of full categories, high output, flexible production organization and high reduction ratio and so on, this process still has many disadvantages such as heavy casting device, long rolling line, high workshop, large space requirement, large device investment, large billet storeroom, high energy consuming and so on. The CSP process comprises continuous casting thin billet with thickness of 50mm-70mm, flame cutting, heating by tunnel furnace, descaling, rolling by finishing rolling train, stream cooling, coiling. Although this process has advantages of lowering investment and production cost, omitting rough rolling train, strengthening finishing rolling train, strengthening reduction capability and so on, this process has many disadvantages such as high casting speed, high breakout ratio, too much restriction to production kinds, difficult developing new grades, high investment of tunnel furnace, complicated devices, hard to operate and maintain, rigid production organization, huge cost of accident treatment, low output and so on. Chinese Patent No. 02132970.2 of the same applicant disclosed a continuous casting and rolling process for medium/thin plate (ASP process). The ASP process comprises converter steel-making, continuous casting thick billet with thickness of 100mm-150mm, flame cutting, heating by walking-beam furnace, descaling, rough rolling by 3+1 rolling train, hot coil box, shearing, descaling, rolling by finishing rolling train, stream cooling, coiling. The ASP process has advantages of low cost, low investment, flexible production organization, simple maintaining, and low accident rate. But it still has disadvantages, for example, it uses too many old devices, the power of the motor of finishing rolling train is low, the speed of the roller table is low, the capacity of water supply is OP07080527 not enough, the strength of rolling mills' transmission system is not enough, the configuration of the power supply system is aging and so on. Therefore, the development of the technology is more or less limited, resulting that output can't reach requirement and the production development also be limited, and further the width precision, surface quality and shape control have certain limitation. Summary of the invention The invention is aimed at eliminating the disadvantages of the above plate production process. The objects of the invention is to enhancing some crucial technique so as to save energy, not only improving the heating quality of billet but also improving the uniformity of plate thickness and quality of plate shape. The invention has advantage of high width precision, improves the work rate and output of the rolling mill, and makes the continuous casting and rolling process for medium plate meet the requirement of modem manufacturing. The production process of the invention substantially employs that of 02132970.2, and also makes some improvements basing on the former process, so as to improve the production capacity of the invention, broaden the range of the production categories, and meanwhile gain new revolution in the fields of shape control, width precision control and surface quality control. The invention also can realize direct rolling of some steel grades. To achieve the above objects, the solution of the invention is a continuous casting and rolling process for medium plate comprising the following steps: continuous casting, during molten steel passing through mold, to form continuous casting billet having section thickness of 100mm-170mm and width of 900mm-2000mm by hydraulic oscillating, continuously bending and continuously straightening; direct rolling, hot feeding and hot charging by two casters with four streams and four-streams-merging-one technique, in which each of the two continuous casters' knockout roller tables respectively connects with entering roller table and exiting roller table of heating furnace, achieving rapid hot feeding and hot charging or direct rolling for continuous casting billet; continuous casting billet is fed to entering roller table of heating furnace through convey roller table, then fed into walking-beam furnace by long-course steel loader of the heating furnace in order to be heated; the exiting roller table of the continuous caster connects with the entering roller table of the heating furnace so that the continuous casting billet is directly fed into the 2 OP07080527 heating furnace by the roller table for hot charging, the hot charging temperature averagely is no less than 700'C; and one exiting roller table of the continuous caster connects with the exiting roller table of the heating furnace; rough rolling by rough rolling mill with front and back vertical rollers, in which the maximum single-pass side-pressing amount of the vertical rollers is 50mm, the maximum rolling pressure is 3800kN, and the rolling speed is 0-5.89m/s; when rolling, in each pass, acting of front vertical rollers and opening of back vertical rollers are automatically completed by computer, and the automatic control of width is realized through hydraulic automatic width control (AWC); finishing rolling using speed-up rolling by finishing rolling train of Fl-F7 with a maximum speed of 22.8m/s, in which vertical rollers are provided before Fl; when thickness of the intermediate billet is 50mm, the maximum pressing amount is 10mm, and the maximum rolling pressure is 10OOkN; Fl-F7 finishing rolling train all are provided with a device for axial shifting and bending working rollers with a maximum axial shifting course of ± 200mm and a maximum bending force of 1500kN, so as to improve the control of plate section's thickness difference and plate shape, and realize free rolling; the maximum speed of the roller table before the finishing rolling train may be up to 5.89m/s; edge heater is provided before the finishing rolling train; stream cooling using three-stage stream cooling technique, in which roughly adjusting valve set and precisely adjusting valve set as well as online high-level water tank are provided, so as to stabilize water amount and water pressure of each cooling stage; the side water-jet pressure is I Mpa-1.2Mpa so as to assure the plate's lengthwise temperature uniformity; coiling with stepping-controlled full hydraulic coiler, in which automatic stepping control is performed by hydraulic-controlled side guide, pinch roller, wrapper roller's collapsible reels and high-responsivity wrapper roller to realize precise centering and micro-tension coiling of plate, reduce towered-shape, avoid the impaction of plate's head on wrapper roller and eliminate impression of plate's head and wrapper roller on plate. In said continuous casting, direct rolling, hot feeding and hot charging, and rough rolling, the exiting roller tables are covered by insulating covers, such that the temperature drop of the casting billet and the temperature difference between the intermediate billet's head and tail are reduced and the temperature of the billet when entering the finishing rolling mill can be increased by 30'C-50'C and the temperature difference between the billet's head and tail can be decreased 3 OP07080527 by 30 C-50 C. In said rough rolling, the vertical roller of the front and back vertical rollers provided in the rough rolling mill is top-attaching driven type, the size of rollers is 4)1200mm/4) 1100mm x 430mm, and the power of main motor is AC 1200kW x 2 x 200/400r/min. In said finishing rolling, the vertical roller of the vertical rollers provided before F1 is top-driven attached type, the size of rollers is $ 750mm/ 4)600mm x 350mm, and the main drive motor is 2-AC 370kW x 550r/min. In said finishing rolling, hydraulic low-inertia kinks are provided between the finishing rolling stands in order to control tension between finishing rolling train and improve plate quality. In said stream cooling, the cooling device is provided with 12 sets of online high-level water tank with a water amount of 1700m 3 /h and a water pressure of 0.05Mpa-0.08Mpa. Said mold is a mold for billet continuous casting which has a cavity whose four corners are in form of right angle or round angle or straight bevel angle, the right angle mold is traditional billet mold which is composed by two wide sidewalls and two narrow sidewalls with a right angle being formed between respective wide sidewall and narrow sidewall; the round angle or straight bevel angle mold for billet continuous casting is composed by two wide sidewalls and two narrow sidewalls, at both sides of each narrow sidewall, namely the inner sides connected with the wide sidewalls, respectively have a row of right-triangle shaped flange, the bevel of which directs to inside, one right-angle surface joins to the inner surface of the narrow sidewalls, and another right-angle surface is in the same plane with the side face of the narrow sidewalls, namely the another right-angle surface is an extension of the side face of the narrow sidewalls. By carrying out three kinds of timing control, namely billet merging timing control, billet passing through logistics bottleneck timing control and billet exiting timing control, and comparing cushioning ability, heating ability and rolling ability, said four-streams-merging-one technique optimizes logistics in three walking-beam furnaces with cushioning zone into which the medium plate in single roller table of two casters with four streams is directly fed, so as to exert the producing capacity of caster, furnace and rolling line and realize half-rigid connection of rolling line, furnace and caster. Said three kinds of timing control are: 4 OP07080527 Billet converge timing control: which one passes through firstly when two streams from caster A converge; which one passes through firstly when two streams from caster B converge; which one passes through firstly when streams from caster A and caster B converge; wherein such principle is followed that "when the billets converge that the stream which reaches convergence point firstly passes through firstly and if the two streams reach simultaneously then the straight stream passes through firstly"; Billet passing through logistics bottleneck timing control: determining the timing of No. 1 billet stream charging #1 larry; determining the timing of No. 4 billet stream charging #3 larry; determining the timing of converging No. 1 and No. 2 billet streams charging #2 larry; determining the timing when the billet charging #1 furnace exits A, roller table; determining the timing of the billet entering the furnace, wherein such principle is followed that "when the billets converge that the stream which reaches convergence point firstly passes through firstly and if the two streams reach simultaneously then the straight stream passes through firstly"; Billet exiting timing control: by tandem superimpose-calculating billet's values at each critical timing as well as checking the cushion capacity and heating capacity of the furnace and the rolling capacity of the rolling line, finding out billet's values at each critical timing of each condition, realizing semi-rigid connection of caster, furnace and rolling line, wherein such principle is followed that "when the billets converge that the stream which reaches convergence point firstly passes through firstly and if the two streams reach simultaneously then the straight stream passes through firstly". Compared with prior arts, the invention has the following advantages: 1. Since new mold is used in the present invention, the corner cooling during molten steel solidifying into billet shell in the mold is adjusted from two-dimensional cooling to nearly one-dimensional cooling, so as to make billet shell solidification relatively uniform to avoid surface defect caused by nonuniform billet corner's cooling solidification and crack caused by too low edge temperature while direct rolling. 2. The long-course steel loader used in the present invention not only makes the furnace having the ability of heating billet but also has the cushion ability for matching continuous casting and rolling pace. If the rolling mill temporarily halts for a short while, it at most can store nine cushioning billets, therefore the casting production is not affected. 5 OP07080527 3. The device for axial shifting and bending working rollers provided in all finishing rolling trains not only can control thickness difference of plate section (crown and wedge) and plate flatness, but also can realize free rolling so as to increase rolling yield. The hydraulic low-inertia kinks used in the production line helps to control tension between finishing rolling train and improve plate quality. The speed-up rolling technique used in the finishing rolling trains shortens the feeding time of roller table, reduces temperature drop, improves thickness uniformity and shape quality and increase mill yield and output. 4. The edge heater helps to improve uniformity of billet temperature, reduce edge crack, improve edge microstructure, and stabilize operation of the finishing rolling mill. 5. The use of three-stage stream cooling control technique and the provision of roughly adjusting valve set and precisely adjusting valve set stabilize water amount and water pressure of each cooling stage and assure the plate's lengthwise temperature uniformity, so as to assure uniformity of the plate's microstructure and overcome the production defect caused by water-supply inefficiency in prior arts. The invention improves the continuous casting and rolling process for medium/thin plate in terms of layout, devices and production process, so that the production ability, development of new grades, production quality are improved. with the present invention, production capacity reaches 5000,000t per year, width precision within 0-10mm reaches 98.5%, the adjustment ability for shape control and crown control reaches advanced world standard, control ability of surface quality fully reaches the quality standard requirements of automobile's high grade panel (05), and the proportion of thin plate reaches advanced world standard. Description of embodiment The invention applies to a continuous casting and rolling process for 2150 medium plate. Molten steel passes through three 250t top-bottom blowing converter, two molten iron desulphurizing and slag skimming station, two LF ladle furnace and one RH-TB vacuum processing device, and before being cast, it may be refined by LF ladle furnace or RH-TB vacuum processing device. Continuous casting: molten steel passes through mold, to form continuous casting billet having section thickness of 100mm-I 70mm, width of 900-2000mm and length of 11 m-1 8m by 6 OP07080527 hydraulic oscillating, continuously bending and continuously straightening, and then the billet is subjected to flame cutting. The billet has a maximum single weight of 38t, the average number of continuously casting furnaces is 30, and the average casting time is 37.3 minute per one furnace. Because of employing the technique of mold hydraulic oscillating, the quality of casting billet can be improved and also the billet surface defect can be eliminated. Direct rolling, hot feeding and hot charging by two casters with four streams and four-streams-merging-one technique, in which each of the two continuous casters' knockout roller tables respectively connects with entering roller table and exiting roller table of heating furnace, achieving rapid hot feeding and hot charging or direct rolling for continuous casting billet; continuous casting billet is fed to entering roller table of heating furnace through convey roller table, then fed into walking-beam furnace by long-course steel loader of the heating furnace in order to be heated. Furthermore, the invention uses direct rolling technique for some kinds of carbon steel and certain kinds of lower alloy steel. The exiting roller table of the continuous caster connects with the entering roller table of the heating furnace so that the continuous casting billet is directly fed into the heating furnace by the roller table for hot charging. The hot charging temperature averagely is no less than 700'C. One exiting roller table of the continuous caster connects with the exiting roller table of the heating furnace. Upon billet being on connecting roller table, its length is automatically measured and also its temperature is measured by pyrometer, in order that the billet can be centered according the layout and then be heated. A computer is used to optimize the heating control based on the temperature of the billet entering the furnace. The billets are heated to 1150'C-1250'C in the furnace, carried out of the furnace by the extractor of the furnace, and placed on the exiting roller table. This can not only save energy, but also shorten heating time and improve heating quality of the billet. Some kinds of carbon steel and certain kinds of lower alloy steel, for example silicon steel, may apply "lower temperature exiting" rolling technique, realizing rolling of different steel grades. The long-course steel loader used in the present invention not only makes the furnace having the ability of heating billet but also has the cushion ability for matching continuous casting and rolling pace. If the rolling mill temporarily halts for a short while, it at most can store nine cushioning billets, therefore the casting production is not affected. By carrying out three kinds of timing control, namely billet merging timing control, billet passing through logistics bottleneck timing control and billet exiting timing control, and 7 OP07080527 comparing cushioning ability, heating ability and rolling ability, the four-streams-merging-one technique optimizes logistics in three walking-beam furnaces with cushioning zone into which the medium plate in single roller table of two casters with four streams is directly fed, so as to exert the producing capacity of caster, furnace and rolling line and realize half-rigid connection of rolling line, furnace and caster. Said three kinds of timing control are: Billet converge timing control: which one passes through firstly when two streams from caster A converge; which one passes through firstly when two streams from caster B converge; which one passes through firstly when streams from caster A and caster B converge; wherein such principle is followed that "when the billets converge that the stream which reaches convergence point firstly passes through firstly and if the two streams reach simultaneously then the straight stream passes through firstly"; Billet passing through logistics bottleneck timing control: determining the timing of No. I billet stream charging #1 larry; determining the timing of No. 4 billet stream charging #3 larry; determining the timing of converging No. I and No. 2 billet streams charging #2 larry; determining the timing when the billet charging #1 furnace exits A, roller table; determining the timing of the billet entering the furnace, wherein such principle is followed that "when the billets converge that the stream which reaches convergence point firstly passes through firstly and if the two streams reach simultaneously then the straight stream passes through firstly"; Billet exiting timing control: by tandem superimpose-calculating billet's values at each critical timing as well as checking the cushion capacity and heating capacity of the furnace and the rolling capacity of the rolling line, finding out billet's values at each critical timing of each condition, realizing semi-rigid connection of caster, furnace and rolling line, wherein such principle is followed that "when the billets converge that the stream which reaches convergence point firstly passes through firstly and if the two streams reach simultaneously then the straight stream passes through firstly". Rough rolling: the heated or direct rolled billet is conveyed by roller tables and passes through high-pressure water descaling box after the furnace so as to remove scale, and then enters into four-roller reversible rough rolling mill so as to be rolled. The four-roller reversible rough rolling mill has attached front and back vertical rollers with a type of top-attaching driven. The 8 OP07080527 size of rollers is $ 1200/ 4 1100mm x 430mm, the maximum single-pass side-pressing amount is 50mm, the maximum rolling pressure is 3800kN, the rolling speed is 0-5.89m/s, and the power of main motor is ACl200kW x 2 x 200/400r/min. when rolling, in each pass, acting of front vertical rollers and opening of back vertical rollers are automatically completed by computer, and the automatic control of width is realized through hydraulic automatic width control (AWC) in which the front vertical rollers carry out odd pass rolling and the back vertical rollers carry out even pass rolling. The maximum side-pressing amount of each pass is 50mm. After being rolled 3-5 passes in the four-roller reversible rough rolling mill, the billet is rolled into intermediate billet with a thickness of 30-60mm. During being rolled by the four-roller reversible rough rolling mill, high-pressure water before and after the four-roller reversible rough rolling mill are used to descale regenerated scales of the billet. The front and back vertical rollers of the four-roller reversible rough rolling mill are provided with automatic width control system (AWC), its main purpose being to correct error of billet width caused by rolling pressure change and correct the width difference between the billet's head and tail. Width gage and pyrometer are provided after the four-roller reversible rough rolling mill, so as to monitor width and temperature of billet and provide correction data for setting of finishing rolling mill. The four-roller reversible rough rolling mill is also provided with dust removal device. Insulating cover is provided at the exiting roller table in order to reduce temperature drop of intermediate billet and temperature difference between the billet's head and tail. Intermediate billet is conveyed to truncate scissor via insulating cover so as to truncate its head and tail. Detector is provided in front of the truncate scissor in order to detect the shape of the billet's head, so as to reduce temperature drop of intermediate billet and temperature difference between the billet's head and tail, and also the temperature at the time of entering finishing rolling mill can be improved by 30'C-50'C and the temperature difference between the billet's head and tail can be shorten by 30'C-50'C. Therefore, it can realize the optimal truncation of the scissor, in order to reduce truncation loss and increase yield. Edge heater is provided in front of the scissor. The heater's parameters are as follows: the power of the main motor is 2 x 3000kW, the heating depth is 40mm-60mm, the heating width is 100mm-150mm, and the temperature rise is 60'C-100'C. This helps to improve temperature uniformity of the billet, reduce edge crack, and improve mischerystal of edge microstucture. Also this helps to stabilize operation of the finishing rolling mill, and simultaneously this can satisfy 9 OP07080527 the requirement of dual phase steel development. After being truncated head and tail, the billet enters into the high-pressure water descaling box before finishing rolling mill in order to remove regeneration scale. Finishing Rolling: billet passes through the small vertical roller device FIE before finishing rolling mill F, so as to be rolled. When thickness of the intermediate billet is 50mm, the maximum pressing amount is 10mm, the maximum rolling pressure is 1OOOkN, the main driving motor is 2-AC 370kW x 550r/min. Thereafter the billet enters finishing rolling train. Passing through Fl-F7 four-roller finishing rolling train, the billet is rolled into 1.8mm-25.4mm final plate. Fl-F7 finishing rolling train all employ a device for axial shifting and bending working roller, the maximum shifting course is ± 200mm, and the bending force is 1500kN. (Only F3-F6 in ASP have the device for axial shifting and bending working roller, and bending force only has positive value, no negative value.) This not only can control thickness difference of plate section (crown and wedge) and plate flatness, but also can realize free rolling and increase rolling yield. The production line uses hydraulic low-inertia kink in order to control tension between finishing rolling train and improve plate quality. Stream cooling: it uses three-stage stream cooling technique, in which roughly adjusting valve set and precisely adjusting valve set as well as 12 sets of online high-level water tank are provided, so as to stabilize water amount and water pressure of each cooling stage. The water amount is 1700m 3 /h, the water pressure is 0.05Mpa-0.08Mpa, and the side water-jet pressure is 1 Mpa-1.2Mpa, so as to assure the plate's lengthwise temperature uniformity. Coiling: it uses stepping-controlled full hydraulic coiler to coil plate, in which automatic stepping control is performed by hydraulic-controlled side guide, pinch roller, wrapper roller's collapsible reels and high-responsivity wrapper roller to realize precise centering and micro-tension coiling of plate, reduce towered-shape, avoid the impaction of plate's head on wrapper roller and eliminate impression of plate's head and wrapper roller on plate The automatic system of the production line is three-grade computer control system, the first grade being basic automatic system, the second grade being procedure control computer system and the third grade being production control computer system. 10 It is to be understood that, if any prior art publication is referred to herein, such reference does not constitute an admission that the publication forms a part of the common general knowledge in the art, in Australia or any other country. In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word "comprise" or variations such as "comprises" or "comprising" is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention. 10 a

Claims (10)

1. A continuous casting and rolling process for medium plate, characterized in that said process comprises the following steps: continuous casting, during molten steel passing through mold, to form continuous casting billet having section thickness of 100mm-170mm and width of 900mm-2000mm by hydraulic oscillating, continuously bending and continuously straightening; direct rolling, hot feeding and hot charging by two casters with four streams and four-streams-merging-one technique, in which each of the two continuous casters' knockout roller tables respectively connects with entering roller table and exiting roller table of heating furnace, achieving rapid hot feeding and hot charging or direct rolling for continuous casting billet; continuous casting billet is fed to entering roller table of heating furnace through convey roller table, then fed into walking-beam furnace by long-course steel loader of the heating furnace in order to be heated; the exiting roller table of the continuous caster connects with the entering roller table of the heating furnace so that the continuous casting billet is directly fed into the heating furnace by the roller table for hot charging, the hot charging temperature averagely is no less than 700'C; and one exiting roller table of the continuous caster connects with the exiting roller table of the heating furnace; rough rolling by rough rolling mill with front and back vertical rollers, in which the maximum single-pass side-pressing amount of the vertical rollers is 50mm, the maximum rolling pressure is 3800kN, and the rolling speed is 0-5.89m/s; when rolling, in each pass, acting of front vertical rollers and opening of back vertical rollers are automatically completed by computer, and the automatic control of width is realized through hydraulic automatic width control (AWC); finishing rolling using speed-up rolling by finishing rolling train of Fl-F7 with a maximum speed of 22.8m/s, in which vertical rollers are provided before Fl; when thickness of the intermediate billet is 50mm, the maximum pressing amount is 10mm, and the maximum rolling pressure is 100kN; Fl-F7 finishing rolling train all are provided with a device for axial shifting and bending working rollers with a maximum axial shifting course of ± 200mm and a maximum bending force of 1500kN, so as to improve the control of plate section's thickness difference and plate shape, and realize free rolling; the maximum speed of the roller table before the finishing rolling train may be up to 5.89m/s; edge heater is provided before the finishing rolling train; II OP07080527 stream cooling using three-stage stream cooling technique, in which roughly adjusting valve set and precisely adjusting valve set as well as online high-level water tank are provided, so as to stabilize water amount and water pressure of each cooling stage; the side water-jet pressure is I Mpa-1.2Mpa so as to assure the plate's lengthwise temperature uniformity; coiling with stepping-controlled full hydraulic coiler, in which automatic stepping control is performed by hydraulic-controlled side guide, pinch roller, wrapper roller's collapsible reels and high-responsivity wrapper roller to realize precise centering and micro-tension coiling of plate, reduce towered-shape, avoid the impaction of plate's head on wrapper roller and eliminate impression of plate's head and wrapper roller on plate.
2. The continuous casting and rolling process for medium plate as claimed in claim 1, characterized in that in said continuous casting, direct rolling, hot feeding and hot charging, and rough rolling, the exiting roller tables are covered by insulating covers, such that the temperature drop of the casting billet and the temperature difference between the intermediate billet's head and tail are reduced and the temperature of the billet when entering the finishing rolling mill can be increased by 30'C-50'C and the temperature difference between the billet's head and tail can be decreased by 30'C-50'C.
3. The continuous casting and rolling process for medium plate as claimed in claim 1, characterized in that in said rough rolling, the vertical roller of the front and back vertical rollers provided in the rough rolling mill is top-attaching driven type, the size of rollers is $ 1200mm/ 4 1100mm x 430mm, and the power of main motor is AC 1200kW x 2 x 200/400r/min.
4. The continuous casting and rolling process for medium plate as claimed in claim 1, characterized in that in said finishing rolling, the vertical roller of the vertical rollers provided before Fl is top-driven attached type, the size of rollers is $ 750mm/$ 600mm x 350mm, and the main drive motor is 2-AC 370kW x 550r/min.
5. The continuous casting and rolling process for medium plate as claimed in claim 1, characterized in that in said finishing rolling, hydraulic low-inertia kinks are provided between the finishing rolling stands in order to control tension between finishing rolling train and improve plate quality.
6. The continuous casting and rolling process for medium plate as claimed in claim 1, characterized in that in said stream cooling, the cooling device is provided with 12 sets of online 12 OP07080527 high-level water tank with a water amount of 1700m 3 /h and a water pressure of 0.05Mpa-0.08Mpa.
7. The continuous casting and rolling process for medium plate as claimed in claim 1, characterized in that the structure of said mold is as follows: said mold is a mold for billet continuous casting which has a cavity whose four corners are in form of right angle or round angle or straight bevel angle, the right angle mold is traditional billet mold which is composed by two wide sidewalls and two narrow sidewalls with a right angle being formed between respective wide sidewall and narrow sidewall; the round angle or straight bevel angle mold for billet continuous casting is composed by two wide sidewalls and two narrow sidewalls, at both sides of each narrow sidewall, namely the inner sides connected with the wide sidewalls, respectively have a row of right-triangle shaped flange, the bevel of which directs to inside, one right-angle surface joins to the inner surface of the narrow sidewalls, and another right-angle surface is in the same plane with the side face of the narrow sidewalls, namely the another right-angle surface is an extension of the side face of the narrow sidewalls.
8. The continuous casting and rolling process for medium plate as claimed in claim 1, characterized in that by carrying out three kinds of timing control, namely billet merging timing control, billet passing through logistics bottleneck timing control and billet exiting timing control, and comparing cushioning ability, heating ability and rolling ability, said four-streams-merging-one technique optimizes logistics in three walking-beam furnaces with cushioning zone into which the medium plate in single roller table of two casters with four streams is directly fed, so as to exert the producing capacity of caster, furnace and rolling line and realize half-rigid connection of rolling line, furnace and caster.
9. The continuous casting and rolling process for medium plate as claimed in claim 8, characterized in that said three kinds of timing control are: billet converge timing control: which one passes through firstly when two streams from caster A converge; which one passes through firstly when two streams from caster B converge; which one passes through firstly when streams from caster A and caster B converge; wherein such principle is followed that "when the billets converge that the stream which reaches convergence point firstly passes through firstly and if the two streams reach simultaneously then the straight stream passes through firstly"; 13 billet passing through logistics bottleneck timing control: determining the timing of No. I billet stream charging #1 larry; determining the timing of No. 4 billet stream charging #3 larry; determining the timing of converging No. 1 and No. 2 billet streams charging #2 larry; determining the timing when the billet charging #1 furnace exits A, roller table; determining the timing of the billet entering the furnace, wherein such principle is followed that "when the billets converge that the stream which reaches convergence point firstly passes through firstly and if the two streams reach simultaneously then the straight stream passes through firstly"; billet exiting timing control: by tandem superimpose calculating billet's values at each critical timing as well as checking the cushion capacity and heating capacity of the furnace and the rolling capacity of the rolling line, finding out billet's values at each critical timing of each condition, realizing semi-rigid connection of caster, furnace and rolling line, wherein such principle is followed that "when the billets converge that the stream which reaches convergence point firstly passes through firstly and if the two streams reach simultaneously then the straight stream passes through firstly".
10. A continuous casting and rolling process for medium plate substantially as hereinbefore described. 14
AU2006228889A 2005-03-28 2006-03-27 A continuous casting and rolling method for medium plate Ceased AU2006228889B2 (en)

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Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100441724C (en) * 2006-12-18 2008-12-10 马鞍山钢铁股份有限公司 Process for production of hot-rolled dual phase steel by continuous casting and continuous rolling of slab billet
CN101209456B (en) * 2006-12-27 2010-11-03 鞍钢股份有限公司 High-strength medium plate production process
CN101293258B (en) * 2007-04-25 2010-12-01 宝山钢铁股份有限公司 Process for manufacturing hot rolled steel strips by continuous casting and rolling middle bar strip
CN101306499B (en) * 2008-06-23 2010-06-09 秦皇岛首秦金属材料有限公司 Production method of steel plate for blast furnace jacket
CN101619384B (en) * 2008-06-30 2012-09-26 鞍钢股份有限公司 Method for automatic jump steel reheating of walking beam of stepping type heating furnace
CN101428386B (en) * 2008-11-06 2012-02-01 杭州钢铁集团公司 GCr15 ferrule cold-punching molding method
CN102102141B (en) * 2009-12-22 2013-12-11 鞍钢股份有限公司 Hot rolling process for improving structural homogeneity of oriented silicon steel plate
CN101941024B (en) * 2010-07-22 2012-06-27 河北省首钢迁安钢铁有限责任公司 Method for eliminating peeling of IF steel edge in hot continuous rolling process
EP2441540A1 (en) 2010-10-12 2012-04-18 Siemens VAI Metals Technologies GmbH Method and assembly for energy-efficient production of hot rolled steel strips
EP2441539A1 (en) * 2010-10-12 2012-04-18 Siemens VAI Metals Technologies GmbH Energy and output-optimised method and assembly for producing hot rolled steel strips
JP5616817B2 (en) * 2011-02-18 2014-10-29 東芝三菱電機産業システム株式会社 Control device for hot rolling line
CN103029010B (en) * 2011-09-30 2015-12-02 宝山钢铁股份有限公司 A kind of compact production technology of metal plate and belt is arranged
CN102367546B (en) * 2011-10-28 2012-11-21 首钢总公司 Control method for coast atmospheric corrosion resistant scale on surface of boat deck
CN103071973A (en) * 2012-12-17 2013-05-01 福建宝达钢业有限公司 Winding process for end plate
CN103882203A (en) * 2012-12-21 2014-06-25 鞍钢股份有限公司 Hot rolling method for improving electromagnetic performance of silicon steel
CN103302106B (en) * 2013-07-09 2015-04-08 济钢集团有限公司 Thick steel plate straightness improvement method and control method thereof in rolling process
CN103480649B (en) * 2013-10-12 2016-10-05 钢铁研究总院 A kind of Direct Rolling produces the method for long profiles
CN103551394B (en) * 2013-11-06 2015-11-18 北京首钢股份有限公司 The control method of a kind of low silicon non-oriented silicon steel thickness profile edge reflex action
CN103862248A (en) * 2014-03-19 2014-06-18 德龙钢铁有限公司 Method for effectively preventing generation of head and tail surface defects in hot rolling process
CN104048846B (en) * 2014-06-27 2016-08-17 安徽马钢和菱实业有限公司 Cut deal flame cutting sampler and sampling method thereof
CN106269871B (en) * 2016-08-30 2017-12-08 武汉钢铁有限公司 A kind of method for using increasing speed rolling technique productions thickness≤2.0mm low-intensity strips in CSP producing lines
CN106734252B (en) * 2016-12-14 2019-01-04 四川德胜集团钒钛有限公司 A kind of slab hot sending technique
CN106583466A (en) * 2016-12-14 2017-04-26 四川德胜集团钒钛有限公司 Rolled steel hot delivery and hot charging technology
CN108941494B (en) * 2018-09-25 2020-07-07 湖南华菱湘潭钢铁有限公司 Hot-feeding and hot-charging process for medium-thickness plate continuous casting billet
CN109663819A (en) * 2018-11-19 2019-04-23 包头钢铁(集团)有限责任公司 A method of reducing thick steel plates length direction abnormity amount end to end
CN110280589A (en) * 2019-07-31 2019-09-27 江苏省沙钢钢铁研究院有限公司 Thick steel plate and its milling method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5430930A (en) * 1993-10-12 1995-07-11 Italimpianti Of America, Inc. Method of manufacturing hot strip
US5564178A (en) * 1993-09-10 1996-10-15 Kyoei Steel Ltd. Process of producing a hot coil and a production system of producing the same
US5991991A (en) * 1995-07-31 1999-11-30 Mannesmann Aktiengesellschaft High-speed thin-slabbing plant

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2649918B1 (en) * 1989-07-19 1994-06-10 Lorraine Laminage Plate lingotiere for continuous casting of metal
JP3174457B2 (en) * 1994-05-17 2001-06-11 株式会社日立製作所 Continuous casting direct hot rolling equipment and rolling method
JPH09192705A (en) * 1996-01-18 1997-07-29 Mitsubishi Heavy Ind Ltd Hot rolling line
JP3646627B2 (en) * 2000-06-13 2005-05-11 Jfeスチール株式会社 Steel plate manufacturing method
CN1216700C (en) * 2002-09-19 2005-08-31 鞍钢集团新钢铁有限责任公司 Three section laminar flow cooling technology for hot rolling band steel
CN1189256C (en) * 2002-09-19 2005-02-16 鞍钢集团新钢铁有限责任公司 Method for continuous casting, continuoccs rolling intermediate and thin sheet blanket
US6884838B2 (en) * 2003-02-20 2005-04-26 Johns Manville International, Inc. Water repellant fiberglass binder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5564178A (en) * 1993-09-10 1996-10-15 Kyoei Steel Ltd. Process of producing a hot coil and a production system of producing the same
US5430930A (en) * 1993-10-12 1995-07-11 Italimpianti Of America, Inc. Method of manufacturing hot strip
US5991991A (en) * 1995-07-31 1999-11-30 Mannesmann Aktiengesellschaft High-speed thin-slabbing plant

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WO2006102835A1 (en) 2006-10-05
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