CN103878178A - Method for producing ultrathin hot-rolled coils from sheet billets by continuous casting and rolling - Google Patents

Method for producing ultrathin hot-rolled coils from sheet billets by continuous casting and rolling Download PDF

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CN103878178A
CN103878178A CN201410075487.XA CN201410075487A CN103878178A CN 103878178 A CN103878178 A CN 103878178A CN 201410075487 A CN201410075487 A CN 201410075487A CN 103878178 A CN103878178 A CN 103878178A
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continuous casting
ultrathin
rolling
temperature
hot rolled
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CN103878178B (en
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宋嗣海
杨晓江
王春峰
栗建辉
吕耀强
李杨
信晓兵
董跃星
马晨
尹国强
安玉超
王纪周
李坤
吕小虎
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Tangshan Branch of HBIS Co Ltd
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Hebei Iron and Steel Co Ltd Tangshan Branch
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Abstract

The invention discloses a method for producing ultrathin hot-rolled coils from sheet billets by continuous casting and rolling. The method includes the technologic steps of (1) steelmaking process, (2) continuous casting process, (3) heating process, (4) hot rolling process and (5) cooling and coiling process. The continuous casting process includes drawing steel balls into continuous casting billets by means of continuous casting, wherein casting speed is controlled to be 4.5-4.7 meters/minute, feeding-to-furnace temperature is within a range from 935 DEG C to 960 DEG C, and thickness and width of the casting billets are controlled to be 70mm and 1260mm respectively. The heating process includes heating the continuous casting billets by a heating furnace with a three-step furnace temperature control function. The hot rolling process includes producing the heated continuous casting billets into ultrathin hot-rolled sheets via a roughing mill and a finishing mill, and controlling finishing temperature as 870 DEG C. The cooling and rolling process includes after the ultrathin hot-rolled sheets are subjected to laminar cooling, coiling at the temperature of 670 DEG C by means of positioning control through a side guide of a coiling machine so as to obtain the ultrathin hot-rolled coils. By reasonable control on rolling temperature, pressing mechanism and stable threading technology, the 1.0mm ultrathin hot-rolled coils are rolled stably in a single piece manner in the continuous casting and rolling flow of the sheet billets, and stable batch production of 1.00 ultrathin strip steel is realized.

Description

CSP is produced the method for ultrathin hot rolled coiled sheet
Technical field
The present invention relates to a kind of production method of hot-rolled sheet coil, especially a kind of CSP is produced the method for ultrathin hot rolled coiled sheet.
Background technology
The ultrathin hot rolled coiled sheet of 1.0mm not only can reduce cold rolling passage when as cold rolling feeds, reduce production costs, save the energy, and importantly hot rolling ultrathin strip is really to realize with the cold peculiar product in the torrid zone, can be widely used in high-end tubulation, electromechanical equipment outside casing liner etc. field, there are higher added value and wide market prospects.
13 of China's sheet billet continuous casting and rolling production lines at present, product covers the kinds such as straight carbon steel, weathering steel, silicon steel, high-carbon steel, thin slab product mainly concentrates on 1.3mm and above specification, the batch steady production of the ultra-thin size hot-rolled coiled sheet of unrealized 1.0mm, and according to foreign statistic, the hot-strip that thickness is greater than 1.0mm can replace 34% of cold-strip steel total amount, and the market potential of the ultra-thin specification product of 1.0mm is huge; China's thin-slab caster is produced the Actual Casting Speed of 70mm continuous casting billet in 4.0～4.4m/min level, and the advanced level of the production pulling rate of thin-slab caster and Korea S Pu item 7.0m/min has certain gap.How to bring into play the technical advantage of CSP production technology, stablize 1.0mm and above ultra-thin specification production, realize with tropical cold-peace and save the energy; The production pulling rate that how to improve thin-slab caster, improves operating efficiency; And how to realize the seriation of CSP production technology distinguishing products, and become a breach of Development of Future Iron & steel Industry, be also the key point that realizes technological innovation.
The processing of existing ultrathin hot rolled coiled sheet adopts following technological process mostly: steel smelting-continuous casting-heating-hot rolling-cooling coiling process.Along with constantly reducing of ultrathin strip thickness, the subject matter running in production is the restriction of maximum mill speed and finishing temperature and coiling temperature, for guaranteeing to be with steel head to pass through safely mm finishing mill unit, also feed smoothly coiling machine through runout table, the speed with steel just can not exceed certain limiting value.Because temperature drop in ultrathin strip production process is exceedingly fast, add the restriction of above-mentioned maximum mill speed, make the band steel that arrives finishing mill be difficult to meet final rolling temperature requirement.
Summary of the invention
The technical problem to be solved in the present invention is to provide the method that CSP that a kind of flow process is stable is produced ultrathin hot rolled coiled sheet.
For solving the problems of the technologies described above, the processing step that the present invention takes is: 1) steel making working procedure: adopt converter smelting, and carry out external refining to its alloying, controlling chemical composition and percentage by weight is: C 0.18～0.22%, Mn 0.20～0.40%, Si≤0.15%, S≤0.012%, P≤0.025%, Als 0.015～0.035%, B 0.0009～0.0030%, and all the other are Fe and inevitable impurity;
2) continuous casting working procedure: above-mentioned steel grade is pulled into continuous casting billet by continuous casting; 4.5～4.7 ms/min of Casting speed controls, 935～960 ℃ of charging temperatures, slab thickness control is 70mm, width is 1260mm;
3) heating process: described continuous casting billet adopts the heating furnace of three sections of Control for Kiln Temperature to heat; Control 1290 ± 10 ℃ of primary reformer temperature, 1300 ± 10 ℃ of 1300 ± 10 ℃, three sections furnace temperature of secondary reformer temperature, 1260 ± 10 ℃ of soaking zones; Slab temperature retention time 24.5～26 minutes; 1250 ± 10 ℃ of tapping temperatures; 1080～1090 ℃ of roughing outlet temperatures, 1035～1050 ℃ of finish rolling inlet temperatures;
4) hot-rolled process: the continuous casting billet after heating is rolled into ultrathin hot rolled plate through roughing mill and finishing mill, controlling finishing temperature is 870 ℃;
5) cooling coiling process: after ultrathin hot rolled plate is cooling by laminar flow, the flipper guide use location of coiling machine is controlled, and batches at 670 ℃, can obtain ultrathin hot rolled coiled sheet.
In heating process of the present invention, adopt recuperative heater.
Technology controlling and process in hot-rolled process of the present invention is: control and enter the slab center line of milling train and milling train centerline deviation within ± 5mm;
Roughing high speed threading amplitude is 45%, and fine-rolling strip steel threading speed is 10.6～11.4m/s, and throwing tail Speed Setting is 10.5m/s, and maximum mill speed is set as 14m/s; In the operation of rolling, the FDTC rate of deceleration is-0.005m/s 2.
In cooling coiling process of the present invention, band steel head is through laminar flow when cooling, wait be with steel head by after start again to spray underflow cooling water.
Percentage elongation >=25% of ultrathin hot rolled coiled sheet of the present invention, yield strength 350～400MPa, tensile strength 470～530MPa.
Adopt the beneficial effect that produces of technique scheme to be: the present invention by reasonable controlled rolling temperature, reduction system, stablize threading technology, thereby stablize the ultrathin hot rolled coiled sheet of one-piece roller 1.0mm at bar strip continuous casting and rolling flow path, realized the batch steady production of 1.0mm ultrathin strip.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the thickness map of the ultrathin hot rolled coiled sheet of the embodiment of the present invention 1 gained;
Fig. 2 is the glacing flatness curve map of the ultrathin hot rolled coiled sheet of the embodiment of the present invention 1 gained;
Fig. 3 is the crown curve figure of the ultrathin hot rolled coiled sheet of the embodiment of the present invention 1 gained;
Fig. 4 is the thickness map of the ultrathin hot rolled coiled sheet of the embodiment of the present invention 2 gained;
Fig. 5 is the glacing flatness curve map of the ultrathin hot rolled coiled sheet of the embodiment of the present invention 2 gained;
Fig. 6 is the crown curve figure of the ultrathin hot rolled coiled sheet of the embodiment of the present invention 2 gained.
The specific embodiment
The method that this CSP is produced ultrathin hot rolled coiled sheet adopts following concrete processing step: 1) steel making working procedure: adopt converter smelting, and carry out external refining to its alloying, controlling chemical composition and percentage by weight is: C 0.18～0.22%, Mn 0.20～0.40%, Si≤0.15%, S≤0.012%, P≤0.025%, Als 0.015～0.035%, B 0.0009～0.0030%, and all the other are Fe and inevitable impurity;
2) continuous casting working procedure: above-mentioned steel grade is pulled into continuous casting billet by continuous casting; 4.5～4.7 ms/min of Casting speed controls, 935～960 ℃ of charging temperatures, slab thickness control is 70mm, width is 1260mm;
3) heating process: described continuous casting billet adopts the heating furnace of three sections of Control for Kiln Temperature to heat; Control 1290 ± 10 ℃ of primary reformer temperature, 1300 ± 10 ℃ of 1300 ± 10 ℃, three sections furnace temperature of secondary reformer temperature, 1260 ± 10 ℃ of soaking zones; Slab temperature retention time 24.5～26 minutes; 1250 ± 10 ℃ of tapping temperatures; RDT(roughing outlet temperature) 1080～1090 ℃, 1035～1050 ℃ of FET (finish rolling inlet temperature);
Described heating furnace is recuperative heater, adopt like this heating furnace heat storage type combustion control technology can be by more than air accumulation of heat to 1000 ℃, and directly deliver to stove chamber inner combustion, exhaust gas temperature drops to 120 ℃～150 ℃, simultaneously the maximum heating ability of application of regenerative combustion technology afterburner combustion system rises to 1350 ℃ by original 1200 ℃, and the cost of coal gas reduces by 25%～27% left and right on year-on-year basis, provide necessary rolling temperature condition for realizing the batch production of 1.0mm ultrathin strip.
4) hot-rolled process: the continuous casting billet after heating is rolled into ultrathin hot rolled plate through roughing mill and finishing mill, controlling finishing temperature is 870 ℃;
A, adopt the control of slab accuracy of alignment: midline position deviation when strand enters milling train is very large on ultra-thin gauge strip steel rolling state impact, for this reason, control and enter the slab center line of milling train and milling train centerline deviation within ± 5mm.
B, employing milling train are stablized threading technology: in the actual production of super thin gauge strip, what accident was maximum is exactly the heap steel that the abnormal sideslip of head threading causes, and is mainly the impact due to many-sided fluctuating factors such as threading speed, reduction system, temperature controls.
The setting of Strip mill speed system comprises: the setting of threading speed; The setting of mill speed; Throw the setting of steel speed; Acceleration and sequential setting.
The formulation of hot-strip speed system should meet the requirement of properties of product control, consider again the needs of needs, output and the rolling stability of transmission system safe operation, CSP also will be considered the requirement that roller hearth type heating furnace buffer time is controlled simultaneously.If it is unreasonable that speed system is formulated, can cause a series of production accident:
Figure 201410075487X100002DEST_PATH_IMAGE002
it is too high that threading speed parameter is set, and just may occur to cause not in time sideslip heap steel accident because threading excessive velocities, operating personnel adjust.
Figure 201410075487X100002DEST_PATH_IMAGE004
mill speed setting parameter too low, rolling rhythm is excessively slow, can cause roller hearth type heating furnace buffer time to gradually reduce, continuous casting is forced to reduction of speed, the performance of the high pulling rate ability of restriction continuous casting and the raising of output.
Figure 201410075487X100002DEST_PATH_IMAGE006
mill speed setting parameter is on the low side, also likely therefore causes that temperature drop in the operation of rolling is excessive, mill load is higher, and then causes the unstable, uncontrollable of as-rolled condition, even causes the generation of heap steel accident.
Figure DEST_PATH_IMAGE008
the setting of throwing steel speed parameter is too low, can cause greatly the unstable of rolling because of afterbody temperature drop equally, and it is too high to throw steel Speed Setting, can cause again operative employee to the adjustment of afterbody not in time, the generation of aggravation whipping number of times and whipping amplitude.
The setting of speed system and control also will have been considered the restriction of crop shears maximum shear speed, i.e., after roughing threading completes, first will drop to shear rate, after having sheared, then are raised to finish rolling threading speed, to guarantee enough finish rolling inlet temperatures.
For on-site actual situations, roughing mill speed is done to following adjustment:
Figure 341946DEST_PATH_IMAGE002
roughing high speed threading: in ultra-thin gauge rolling process, due to intermediate blank and reach limit inferior, intermediate blank is between R2～F1 in the distance of 24 meters, intermediate blank temperature loss is larger, cause in finishing mill each frame temperature on the low side, roll-force is bigger than normal, finishing temperature cannot hit etc. problem.
In order to solve this series of problems, according to specification difference, roughing threading speed is improved, when rolling 1.0mm, roughing high speed threading amplitude is 45%.Described threading amplitude is: the speed percentage improving take original start threading speed as benchmark, and for example threading amplitude is 20%, practical rolling speed is 120% of initial threading speed.
Figure 259086DEST_PATH_IMAGE004
finish rolling threading speed: in order to guarantee thin specification finishing temperature and threading stability, setting≤1.2mm specification, the band steel threading speed limit of F5 frame is 11.4m/s, has avoided the problem because be unfavorable for judgement in the too high milling train causing of threading speed with steel state, has improved the stability of threading.
1.0mm specification: the threading speed setting value upper limit is set as 11.4m/s, threading speed setting value lower limit set is that the default definite value of 10.6m/s, threading speed is set as 11.4m/s.
Figure 848943DEST_PATH_IMAGE006
the rate of deceleration: in ultra-thin gauge rolling process, finishing temperature produces fluctuation up and down along with the fluctuation of speed, and in the time that milling train reduction of speed amplitude is larger, it is poor that rolling stability becomes.Make to be with steel reduction of speed amplitude to reduce, the stability while guaranteeing high-speed rolling, is adjusted into-0.005 m/s by the 1.0 specification FDTC rates of deceleration 2.Described FDTC is: be finishing temperature control rate of change, represent the speed degree of the finishing temperature speed regulation and control of finishing mill outlet.
Figure 244152DEST_PATH_IMAGE008
throw tail speed: in order to improve rolling stability, the minimizing whipping with steel afterbody, according to different size, set different throwing tail speed, made to be with steel afterbody as-rolled condition controlled, the throwing tail Speed Setting of 1.0mm specification is 10.5m/s.
Figure DEST_PATH_IMAGE010
maximum mill speed: in ultra-thin gauge rolling process, maximum mill speed is set when excessive, may cause certain rolling mill speed to reach limes superiors; Maximum mill speed is set when too small, may cause the unstable of as-rolled condition.Maximum mill speed is optimized, and the maximum mill speed of 1.0mm specification is set as 14m/s.
5) cooling coiling process: adopt following batching to stablize threading technology:
1. the cooling threading technology of stably stratified flow: cooling by laminar flow smoothly in order to guarantee high-speed motion ultrathin strip, band steel adopts and lags behind to underflow cooling water, while being with steel head cooling through laminar flow, cooling group of head position place section is not sprayed lower cooling water, wait be with steel head by after underflow cooling water valve feedwater again, start to spray underflow cooling water; Can avoid like this due to spray underflow cooling water make to be with steel fly to stick up folding, thereby caused the heap steel accident that cannot nip of batching of overlapping.
2. plate rolling side guide Position Control: because ultra-thin 1.0mm gauge strip hardness of steel is smaller, in order to prevent being with steel to be stopped paying out raw product quality defect and threading heap steel accident by flipper guide scratch limit portion or folder, stop using pressure control, use location is controlled.
3. prevent with steel loose winding technology: under the prerequisite guaranteeing with steel mechanical property, Strip Steel Coiling Temperature is set as to 670 ℃.
Percentage elongation >=25% of the ultrathin hot rolled coiled sheet of this method gained, yield strength 350～400MPa, tensile strength 470～530MPa.
Embodiment 1: this CSP is produced the method for ultrathin hot rolled coiled sheet take 1250mm*1.0mm hot-rolled sheet coil as example, and its concrete technology is as described below.
Steel making working procedure: adopt converter smelting, and carry out external refining to its alloying, its chemical composition and percentage by weight are: C 0.20%, Mn 0.22%, Si 0.11%, S 0.005%, P 0.019%, Als 0.02%, B 0.0012%, all the other are Fe and inevitable impurity.
Continuous casting working procedure: carry out continuous casting, 4.7 ms/min of Casting speed controls, 940～960 ℃ of charging temperatures, slab thickness control is 70mm, width 1260mm.
Heating process: carry out heat accumulating type automatic combustion control system homogeneous heating, 1290 ± 10 ℃ of primary reformer temperature, 1300 ± 10 ℃ of 1300 ± 10 ℃, three sections furnace temperature of secondary reformer temperature, 1260 ± 10 ℃ of soaking zones; Slab temperature retention time 25 minutes; 1250 ± 10 ℃ of tapping temperatures; 1080～1090 ℃ of RDT (1120 ℃ of band steel heads), 1040～1050 ℃ of FET; Then slab to heating furnace soaking zone slab centering is adjusted.
Hot-rolled process: carry out milling train, control slab center line and milling train centerline deviation within ± 5mm; Roughing high speed threading amplitude is 45%, and fine-rolling strip steel threading speed is 10.6m/s, and throwing tail Speed Setting is 10.5m/s, and maximum mill speed is set as 14m/s; The FDTC rate of deceleration is-0.005m/s 2; Controlling finishing temperature is 870 ℃.
Cooling coiling process: be 670 ℃, the control of flipper guide use location by laminar flow cooling control coiling temperature, batch the ultrathin hot rolled coiled sheet that can obtain 1.0mm.
As shown in Figure 1, plate shape as shown in Figures 2 and 3 for the thickness curve of the ultrathin hot rolled coiled sheet of the present embodiment gained; Mechanical property is in table 1.
The mechanical property of the ultrathin hot rolled coiled sheet of table 1: embodiment 1 gained
Figure 201410075487X100002DEST_PATH_IMAGE001
Embodiment 2: this CSP is produced the method for ultrathin hot rolled coiled sheet take 1250mm*1.0mm hot-rolled sheet coil as example, and its concrete technology is as described below.
Steel making working procedure: adopt converter smelting, and carry out external refining to its alloying, its chemical composition and percentage by weight are: C 0.19%, Mn 0.22%, Si 0.14%, S 0.06%, P 0.018%, Als 0.02%, B 0.0011%, all the other are Fe and inevitable impurity.
Continuous casting working procedure: carry out continuous casting, 4.5 ms/min of Casting speed controls, 935～950 ℃ of charging temperatures, slab thickness control is 70mm, width 1260mm.
Heating process: carry out heat accumulating type automatic combustion control system homogeneous heating, one adds 1290 ± 10 ℃, two adds 1300 ± 10 ℃, three and add 1300 ± 10 ℃, 1260 ± 10 ℃ of soaking zones; Slab temperature retention time 25 minutes; 1250 ± 10 ℃ of tapping temperatures; 1080～1090 ℃ of RDT (1140 ℃ of band steel heads), 1035～1045 ℃ of FET.Then slab to heating furnace soaking zone slab centering is adjusted.
Hot-rolled process: carry out milling train, control slab center line and milling train centerline deviation within ± 5mm; Roughing high speed threading amplitude is 45%, and fine-rolling strip steel threading speed is 11.4m/s, and throwing tail Speed Setting is 10.5m/s, and maximum mill speed is set as 14m/s; The FDTC rate of deceleration is-0.005m/s 2; Controlling finishing temperature is 870 ℃.
Cooling coiling process: be 670 ℃, the control of flipper guide use location by laminar flow cooling control coiling temperature, batch the ultrathin hot rolled coiled sheet that can obtain 1.0mm.
As shown in Figure 4, plate shape as shown in Figure 5 and Figure 6 for the thickness curve of the ultrathin hot rolled coiled sheet of the present embodiment gained; Mechanical property is in table 2.
The mechanical property of the ultrathin hot rolled coiled sheet of table 2: embodiment 2 gained
Figure 638958DEST_PATH_IMAGE002
Embodiment 3: this CSP is produced the method for ultrathin hot rolled coiled sheet take 1250mm*1.0mm hot-rolled sheet coil as example, and its concrete technology is as described below.
Steel making working procedure: adopt converter smelting, and carry out external refining to its alloying, its chemical composition and percentage by weight are: C 0.18%, Mn 0.20%, Si 0.12%, S 0.10%, P 0.025%, Als 0.015%, B 0.0030%, all the other are Fe and inevitable impurity.
Continuous casting working procedure: carry out continuous casting, 4.6 ms/min of Casting speed controls, 940～950 ℃ of charging temperatures, slab thickness control is 70mm, width 1260mm.
Heating process: carry out heat accumulating type automatic combustion control system homogeneous heating, one adds 1290 ± 10 ℃, two adds 1300 ± 10 ℃, three and add 1300 ± 10 ℃, 1260 ± 10 ℃ of soaking zones; Slab temperature retention time 25 minutes; 1250 ± 10 ℃ of tapping temperatures; 1080～1090 ℃ of RDT (1140 ℃ of band steel heads), 1040～1045 ℃ of FET.Then slab to heating furnace soaking zone slab centering is adjusted.
Hot-rolled process: carry out milling train, control slab center line and milling train centerline deviation within ± 5mm; Roughing high speed threading amplitude is 45%, and fine-rolling strip steel threading speed is 11.0m/s, and throwing tail Speed Setting is 10.5m/s, and maximum mill speed is set as 14m/s; The FDTC rate of deceleration is-0.005m/s 2; Controlling finishing temperature is 870 ℃.
Cooling coiling process: be 670 ℃, the control of flipper guide use location by laminar flow cooling control coiling temperature, batch the ultrathin hot rolled coiled sheet that can obtain 1.0mm.
The mechanical property of the ultrathin hot rolled coiled sheet of the present embodiment gained is in table 3.
The mechanical property of the ultrathin hot rolled coiled sheet of table 3: embodiment 3 gained
Figure 338356DEST_PATH_IMAGE001
Embodiment 4: this CSP is produced the method for ultrathin hot rolled coiled sheet take 1250mm*1.0mm hot-rolled sheet coil as example, and its concrete technology is as described below.
Steel making working procedure: adopt converter smelting, and carry out external refining to its alloying, its chemical composition and percentage by weight are: C 0.22%, Mn 0.40%, Si 0.15%, S 0.12%, P 0.020%, Als 0.035%, B 0.0009%, all the other are Fe and inevitable impurity.
Continuous casting working procedure, heating process, hot-rolled process and cooling coiling process are with embodiment 3.
The mechanical property of the ultrathin hot rolled coiled sheet of the present embodiment gained is in table 4.
The mechanical property of the ultrathin hot rolled coiled sheet of table 4: embodiment 3 gained
Figure 201410075487X100002DEST_PATH_IMAGE003

Claims (5)

1. the method that CSP is produced ultrathin hot rolled coiled sheet, it is characterized in that, it comprises following processing step: 1) steel making working procedure: adopt converter smelting, and carry out external refining to its alloying, controlling chemical composition and percentage by weight is: C 0.18～0.22%, Mn 0.20～0.40%, Si≤0.15%, S≤0.012%, P≤0.025%, Als 0.015～0.035%, B 0.0009～0.0030%, and all the other are Fe and inevitable impurity;
2) continuous casting working procedure: above-mentioned steel grade is pulled into continuous casting billet by continuous casting; 4.5～4.7 ms/min of Casting speed controls, 935～960 ℃ of charging temperatures, slab thickness control is 70mm, width is 1260mm;
3) heating process: described continuous casting billet adopts the heating furnace of three sections of Control for Kiln Temperature to heat; Control 1290 ± 10 ℃ of primary reformer temperature, 1300 ± 10 ℃ of 1300 ± 10 ℃, three sections furnace temperature of secondary reformer temperature, 1260 ± 10 ℃ of soaking zones; Slab temperature retention time 24.5～26 minutes; 1250 ± 10 ℃ of tapping temperatures; 1080～1090 ℃ of roughing outlet temperatures, 1035～1050 ℃ of finish rolling inlet temperatures;
4) hot-rolled process: the continuous casting billet after heating is rolled into ultrathin hot rolled plate through roughing mill and finishing mill, controlling finishing temperature is 870 ℃;
5) cooling coiling process: after ultrathin hot rolled plate is cooling by laminar flow, the flipper guide use location of coiling machine is controlled, and batches at 670 ℃, can obtain ultrathin hot rolled coiled sheet.
2. CSP according to claim 1 is produced the method for ultrathin hot rolled coiled sheet, it is characterized in that: in described heating process, adopt recuperative heater.
3. CSP according to claim 1 is produced the method for ultrathin hot rolled coiled sheet, it is characterized in that, the technology controlling and process in described hot-rolled process is: control and enter the slab center line of milling train and milling train centerline deviation within ± 5mm;
Roughing high speed threading amplitude is 45%, and fine-rolling strip steel threading speed is 10.6～11.4m/s, and throwing tail Speed Setting is 10.5m/s, and maximum mill speed is set as 14m/s; In the operation of rolling, the FDTC rate of deceleration is-0.005m/s 2.
4. CSP according to claim 1 is produced the method for ultrathin hot rolled coiled sheet, it is characterized in that: in described cooling coiling process, band steel head is through laminar flow when cooling, wait be with steel head by after start again to spray underflow cooling water.
5. the method for producing ultrathin hot rolled coiled sheet according to the CSP described in claim 1-4 any one, is characterized in that: percentage elongation >=25% of described ultrathin hot rolled coiled sheet, yield strength 350～400MPa, tensile strength 470～530MPa.
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CN112893481A (en) * 2021-01-27 2021-06-04 唐山钢铁集团有限责任公司 Shape control method for high-strength low-alloy steel hot-rolled strip steel
CN114042761A (en) * 2021-09-29 2022-02-15 武汉钢铁有限公司 Control method for eliminating laminar cooling wave shape of thin-specification checkered plate
CN114700364A (en) * 2022-03-30 2022-07-05 张家港宏昌钢板有限公司 Method for improving hot rolling stability of 75Cr1 saw blade steel
CN115491601A (en) * 2022-09-20 2022-12-20 武汉钢铁有限公司 Economical magnet yoke steel with yield strength of 350MPa grade produced by CSP production line and production method

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CN106734201A (en) * 2016-12-27 2017-05-31 中冶南方工程技术有限公司 A kind of method that application continuous casting and rolling technique of sheet bar produces Thin Specs low-alloy high-strength steel
CN106734201B (en) * 2016-12-27 2018-05-08 中冶南方工程技术有限公司 A kind of method using continuous casting and rolling technique of sheet bar production Thin Specs low-alloy high-strength steel
CN106734200B (en) * 2016-12-27 2018-05-08 中冶南方工程技术有限公司 A kind of method using continuous casting and rolling technique of sheet bar production Thin Specs dual phase steel
CN106583453A (en) * 2016-12-27 2017-04-26 中冶南方工程技术有限公司 Method for producing ultrathin low-carbon steel by use of thin slab casting and rolling process
CN107199246A (en) * 2017-07-26 2017-09-26 河钢股份有限公司承德分公司 Hot rolling thin gauge strip method for coiling
CN107199246B (en) * 2017-07-26 2019-10-29 河钢股份有限公司承德分公司 Hot rolling thin gauge strip method for coiling
CN107617647A (en) * 2017-09-13 2018-01-23 武汉钢铁有限公司 The method that CSP produces thickness≤1.2mm hot-strips
CN108435794A (en) * 2018-04-10 2018-08-24 中冶赛迪工程技术股份有限公司 A kind of process of continuous casting and rolling
CN108435794B (en) * 2018-04-10 2019-09-24 中冶赛迪工程技术股份有限公司 A kind of process of continuous casting and rolling
CN111215456A (en) * 2018-11-23 2020-06-02 宝山钢铁股份有限公司 Method for controlling threading stability of strip steel in hot-rolling laminar cooling area
CN110340144A (en) * 2019-07-02 2019-10-18 北京首钢股份有限公司 A kind of hot rolling method of thin gauge ultra high silicon silicon steel
CN110340144B (en) * 2019-07-02 2021-01-08 北京首钢股份有限公司 Hot rolling method for thin-specification ultrahigh silicon steel
CN112692056A (en) * 2020-12-30 2021-04-23 唐山燕山钢铁有限公司 Production process of ultrathin hot-rolled checkered plate with thickness of less than 1mm
CN112893481A (en) * 2021-01-27 2021-06-04 唐山钢铁集团有限责任公司 Shape control method for high-strength low-alloy steel hot-rolled strip steel
CN114042761A (en) * 2021-09-29 2022-02-15 武汉钢铁有限公司 Control method for eliminating laminar cooling wave shape of thin-specification checkered plate
CN114700364A (en) * 2022-03-30 2022-07-05 张家港宏昌钢板有限公司 Method for improving hot rolling stability of 75Cr1 saw blade steel
CN115491601A (en) * 2022-09-20 2022-12-20 武汉钢铁有限公司 Economical magnet yoke steel with yield strength of 350MPa grade produced by CSP production line and production method

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