CN109482648A - ESP production line roughing section microstructure homogenization rolling system and its method - Google Patents
ESP production line roughing section microstructure homogenization rolling system and its method Download PDFInfo
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- CN109482648A CN109482648A CN201811297751.9A CN201811297751A CN109482648A CN 109482648 A CN109482648 A CN 109482648A CN 201811297751 A CN201811297751 A CN 201811297751A CN 109482648 A CN109482648 A CN 109482648A
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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
- B21B1/46—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 metal immediately subsequent to continuous casting
- B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- 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
- B21B45/02—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 for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
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- Engineering & Computer Science (AREA)
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- Metal Rolling (AREA)
Abstract
The present invention discloses a kind of ESP production line roughing section microstructure homogenization rolling system and its method, it is included between caster outlet and roughing entrance and arranges that quickly cooling device is rapidly cooled continuous casting billet, continuous casting billet surface is set to form cold shell, by controlling the non-uniform temperature field distribution in thickness of strand direction, so that continuous casting billet Strain Distribution of thickness direction in rough rolling process is more uniform rationally.Original insulation cover is replaced with the attemperator with induction heating and induction heater cooperates by the intermediate region after roughing before finish rolling, for carrying out two sections of heating to intermediate base.Method and device thereof of the invention ensure that the non-uniform temperature field distribution in thickness of strand direction, so that continuous casting billet Strain Distribution of thickness direction in rough rolling process is more uniform rationally, pass through the control to intermediate base heating cycle simultaneously, keep it in the higher state of temperature, when producing micro alloyed steel, the alloy solid solution rate that intermediate base can be improved, promotes mechanical property.
Description
Technical field
The invention belongs to steel material engineering field, it is related to a kind of ESP production line rolling system and its method, especially one
Kind ESP production line roughing section microstructure homogenization rolling system and its method.
Background technique
In the production of strip, the development trend that ultrathin strip is thin slab continuous casting and rolling, conventional heat are produced for cold with heat
Strip production technology is rolled since pollution is heavy, energy consumption is high, is not suitable for the ultra-thin specification product of production, with continuous casting and rolling technique of sheet bar
Continuous development and progress, band may be implemented in ESP (Endless Strip Production) short route continuous casting and rolling production line
Steel endless rolling is more suitable for producing the multiphase steel grade of ultra thin plate, with process is short, equipment is few, small investment, quick, production week
The advantages that phase is short, organization of production is flexible, energy saving, lumber recovery is high, is listed in the cutting edge technology of world today's metallurgical industry.
ESP endless rolling production line is improved by ISP production line, and the work of endless rolling hot ultrathin strip is realized
Skill is broken through.
ESP production line is compared compared with ISP production line, and in tandem rolling region, being most significantly improved is to feel original Coil Box
It answers heating equipment to be replaced, is quickly heated intermediate base before entering finish rolling, establish temperature for production ultrathin strip
Degree basis.Production line improve bring advantage it is clear that but disadvantage also can not be ignored.Lack the ESP production line of Coil Box
Although product quality can also reach requirement, due to the more original ISP production line of the defect in its texture structure
Product is slightly poor compared to comprehensive mechanical property；A large amount of electric energy will be consumed in the continuous heating of production process, induction heater, will be accounted for about
The 40%-50% of entire production energy consumption.This also illustrates ESP production line, and there is also advanced optimize improved space.
ESP production line is 70-90mm and 90-110mm, the centre after roughing for the thickness of strand of rolling at present
Base is with a thickness of 10-18mm.Since continuous casting billet is thicker, and intermediate base does not pass through at Coil Box as ISP production line
Reason, therefore in the structure property uniformity for entering the intermediate base before finish rolling by not as good as the ISP production line before improvement, this will affect
The quality of ESP production line final finished.
Summary of the invention
The purpose of the present invention is improved by the adjustment to apparatus for production line, to control for the problem present on
The heart table temperature of continuous casting billet is finally reached so that continuous casting billet is more uniform in the Strain Distribution of rough rolling step through-thickness
The purpose of even intermediate base tissue.
The scheme that the present invention solves its technical problem is to provide a kind of ESP production line roughing section microstructure homogenization rolling system
System, including conticaster, quickly cooling device, roughing mills, the attemperator with induction heating, induction heater, high pressure descaling
Machine and mm finishing mill unit；Wherein quickly cooling device is arranged between the outlet of the conticaster and the entrance of the roughing mills,
The quickly cooling device is rapidly cooled continuous casting billet, make continuous casting billet the heart table temperature difference control 520 DEG C to 480 DEG C it
Between, attemperator and induction heater with induction heating is arranged in the intermediate region after roughing before finish rolling, after to roughing
Intermediate base carry out two sections heating.
Preferably, the cooling water positional distance roughing mills that the quickly cooling device is injected on the continuous casting billet enter
Mouth distance is not more than 0.15m.Cooling ratio is controlled in 2500W/ (m by adjusting hydraulic pressure and water yield2K) left and right, it is cold
But the time be 8~10s, through rapid cooling, so that continuous casting billet surface is formed cold shell, continuous casting billet was risen again after the cooling period in order to prevent
Greatly, the distance that quickly cooling device cooling water is injected in the positional distance roughing entrance on continuous casting billet should be not more than 0.15m.
Preferably, the length of above-mentioned quickly cooling device is determined by the drawing speed of conticaster.It is produced currently used for ESP
The conticaster drawing speed of line is up to 7m/min, therefore the setting of the length of cooling device can be carried out by different drawing speeds
Scale setting.The lot of experiments discovery of people, the length of quickly cooling device are set as 0.85-1.2m and are through the invention
More preferred scheme.
Preferably, the intermediate region after roughing before finish rolling, by attemperator of original insulation cover with induction heating
It is replaced and the induction heater of primary producing line cooperates, for carrying out two sections of heating to intermediate base.And band sense of the invention
The attemperator that should be heated is to be able to achieve first to carry out the device that induction heating subsequently enters heat preservation.
There to be following 3 benefits after attemperator replacement of the insulation cover with induction heating:
First is that although original insulation cover can effectively keep the temperature intermediate base, under different drawing speeds, in
Between base when being kept the temperature there are 40~85 DEG C of temperature drop, and the temperature rise of the power of induction heating and raising is linear relationship, if
It is to be begun to warm up at the end of roughing to intermediate base with the mode of induction heating, can quickly reduces intermediate base after roughing
The heart table temperature difference, the time for making intermediate base temperature reach samming shortens, and balances out the setting bring temperature drop because of cooling device, together
When, quickly heating can discharge the Strain Accumulation generated in rough rolling process, keep the Tissue distribution of intermediate base more uniform.
Second is that will lead to the bulk temperature of intermediate base at the end of roughing before roughing entrance to the rapid cooling of continuous casting billet
It is low before not improving, it can exceed that the heating ability of original production line induction heating equipment, not can guarantee the temperature to finish rolling entrance
Degree control, so needing with the attemperator replacement with induction heating only with the insulation cover of heat insulation function；
Third is that two sections of heating can flexibly control heating temperature, facilitate the alloy solid solution rate for improving intermediate base, promotes plate
Quality.
It is released in order to not influence useless plate and the arrangement and function of the original LPT device of this section of ESP production line such as collection device,
The above-mentioned attemperator pattern length with induction heating for replacing conventional vacuum cover is consistent with original insulation cover length.
Another aspect of the present invention additionally provides a kind of aforementioned ESP production line roughing section microstructure homogenization rolling system of utilization
The ESP production line roughing section microstructure homogenization milling method of progress, wherein the continuous casting billet is first before entering the roughing mills
By quickly cooling device, cooling ratio is controlled in 2500W/ (m by adjusting hydraulic pressure and water yield2K) left and right, it is cooling
Time is 8~10s, and through cooling, the heart table temperature difference of continuous casting billet is controlled at 520 DEG C~480 DEG C, before entering roughing, continuous casting billet warp
1.5s rises again, and the control of the heart table temperature difference is 420 DEG C~380 DEG C, and continuous casting billet later will be by the attemperator with induction heating through roughing
Heat temperature raising is carried out with induction heater, in first segment heating, intermediate base is first heated to 1000 DEG C or so, subsequent second
Intermediate base is heated to 1180 DEG C again in Duan Jiare.
What technical solution of the present invention can achieve has the beneficial effect that:
1, due to the presence of the cold shell of continuous casting billet, center portion will be deformed preferentially when rolling, the even tissue of the intermediate base after roughing
Property increases before not improving.
2, by the replacement to apparatus for production line, original heating cycle is improved, is guaranteeing not influence subsequent handling
Under the premise of, heating energy consumption is reduced, quickly heating can discharge the Strain Accumulation generated in rough rolling process central part, make centre
The Tissue distribution of base is more uniform.
3, improved heating cycle extends intermediate base in the time of high temperature, when producing micro alloyed steel, is conducive to close
The solid solution of gold element, the alloying element Solid soluble Nb of intermediate base will be promoted before not improving.
By the way that quickly cooling device is added in continuous casting and rolling production line and replaces with attemperator with induction heating
Device comprehensive function in attemperator, the two and original production line ensure that the non-uniform temperature field point in thickness of strand direction
Cloth so that continuous casting billet Strain Distribution of thickness direction in rough rolling process is more uniform rationally, while reducing heating energy consumption, leads to
Flexibly control heating temperature is crossed, when producing micro alloyed steel, facilitates the alloy solid solution rate for improving intermediate base, improves the power of plate
Learn performance.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of ESP production line roughing section microstructure homogenization rolling system of the present invention；
Fig. 2 is strain maximum value position figure in the operation of rolling of the invention；
Fig. 3 is strained situation figure after present invention rolling.
Specific embodiment
The present invention passes through the non-uniform temperature field distribution in control thickness of strand direction, so that continuous casting billet is in rough rolling process
The Strain Distribution of thickness direction is more uniform rationally, to achieve the purpose that homogenization rolling.
The present invention will be described with specific embodiment with reference to the accompanying drawings of the specification.
As shown in Figure 1, a kind of ESP production line roughing section microstructure homogenization rolling system, including conticaster 1, it is quickly cooled down
Device 2, roughing mills 3, the attemperator 4 with induction heating, induction heater 5, high pressure descaling machine 6 and mm finishing mill unit 7；Even
Quickly cooling device 2 is arranged between the outlet of casting machine 1 and 3 entrance of roughing mills, quickly cooling device is rapidly cooled continuous casting billet,
After intermediate region after roughing before finish rolling, attemperator 4 of the setting with induction heating and induction heater 5 are used for roughing
Intermediate base carries out guarantor's mild heat.
By the rapid cooling of quickly cooling device 2, the continuous casting billet surface come out from conticaster 1 is made to form cold shell, in order to
Prevent continuous casting billet from rising again after the cooling period excessive, quickly cooling device cooling water is injected in the positional distance roughing entrance on continuous casting billet
Distance be not more than 0.15m.
The length of above-mentioned quickly cooling device is determined by the drawing speed of conticaster.Company currently used for ESP production line
Casting machine drawing speed is up to 7m/min, therefore the setting of the length of cooling device can carry out scale by different drawing speeds
Setting, such as table 1.The present invention is preferably arranged to 0.85-1.2m by the length that many experiments obtain quickly cooling device.
1 drawing speed of table and the setting of cooled region length
| Drawing speed m/min | 5m/min | 6m/min | 7m/min |
| Cooling length m | 0.85 | 1 | 1.2 |
With continuous casting billet thickness 80mm, intermediate base thickness 18mm, for drawing speed is 6m/min.Before improvement, go out from conticaster 1
The continuous casting billet come heart table temperature difference after natural cooling is 110 DEG C, and in the operation of rolling of the first passage of roughing, through-thickness is most
Big strain is present in 13mm, and after three rack roughing 3, mean temperature is 981 DEG C, enters induction heater in intermediate base
Temperature is reduced to 930 DEG C before 5, then passes through induction heater 5 and is heated to 1180 DEG C, through 6 de-scaling of high pressure descaling machine, finally enters
Mm finishing mill unit 7 carries out finish rolling.
After improvement, continuous casting billet first passes through quickly cooling device 2 before entering finish rolling, through cooling, the heart table of continuous casting billet
The temperature difference is up to 500 DEG C, and before entering roughing, continuous casting billet is risen again through 1.5s, and the heart table temperature difference is 400 DEG C, in the first passage of roughing
In the operation of rolling, due to the presence of the cold shell of continuous casting billet, through-thickness maximum strain value is thick after three racks present in 20mm
After rolling, mean temperature is 949 DEG C, since improved production line replaces attemperator 4 of the heat-preserving equipment with induction heating
It changing, continuous casting billet will be through will directly carry out heat temperature raising after roughing, since surface temperature is 930 DEG C to plate after roughing, center portion
Temperature is 968 DEG C, first carries out induction heating to intermediate base after roughing, improves intermediate base surface temperature rapidly, reduces heart table temperature
Difference promotes the bulk temperature of intermediate base, by induction heating heat-preserving equipment make intermediate base after entering continue induction heater it
Preceding temperature can reach 1000 DEG C or so, and intermediate base is heated to 1180 DEG C again in subsequent second segment heating.
In improved the first passage of roughing, such as Fig. 2, strains the position that maximum value occurs and has deepened 7mm compared with before-improvement,
Surface strain reduces, and the Strain Distribution of through-thickness is also more uniform, and center portion deformation is more abundant；In third passes
When, such as Fig. 3, since strip bulk temperature is low compared with before-improvement, although the accumulated plastic strain on surface has small size raising, but center portion is same
Sample also has small size raising, is conducive to the structure property uniformity for improving intermediate base.
In ESP production line, it is generally the case that placed side by side with insulation cover is steel plate off-line equipment, and function is slotting
Enter, extract dummy bar out, will be unable to the continuous casting billet for continuing rolling or intermediate base releases rolling line.The heat preservation being equipped on rollgang
Cover is opened when stopping rolling and production cut deal, can reduce thermal loss when carrying out endless rolling.In original production line
On, steel plate off-line equipment is essential, therefore in the design of primary producing line, adds heat preservation on track arranged side by side with off-line equipment and set
It is standby that intermediate base is kept the temperature, for reducing temperature drop.For intermediate base after by insulation cover, bulk temperature can become more equal
It is even, therefore, during subsequent induction heating, it is considered as heating up the uniform strip of temperature.In the present invention, lead to
The improvement to production technology is crossed, can first pass through what insulation cover heat preservation reheating was likely to occur to avoid base intermediate after roughing
The subsequent insufficient situation of heating, therefore an important improvement point of the invention is to be replaced with the attemperator with induction heating
Original conventional vacuum equipment can reduce heating energy consumption while avoiding above-mentioned condition that from may occurring.
In heating or insulating process, for micro alloyed steel, the solid solution of alloying element and temperature are closely related, closer
The full solid solubility temperature of alloying element, the solid solution of alloying element is more abundant, and Solid soluble Nb is higher, inhibits Ovshinsky in the subsequent operation of rolling
The effect of body recrystallization is just more obvious；But the excessively high of temperature can cause unevenly growing up for austenite, in subsequent rolling
Occurs mixed crystal phenomenon in journey.
In the present invention, quickly cooling device, fast quickly cooling are arranged between the outlet of conticaster 1 and the entrance of roughing mills
But device 2 is rapidly cooled continuous casting billet, the intermediate region after roughing before finish rolling, and the attemperator with induction heating is arranged
4 and induction heater 5, for carrying out two sections of heating to the intermediate base after roughing.Continuous casting billet first passes through before entering roughing mills 3
Quickly cooling device 2 is controlled cooling ratio in 2500W/ (m by adjusting hydraulic pressure and water yield2K) left and right, when cooling
Between be 8~10s.Through cooling, the heart table temperature difference of continuous casting billet is controlled at 520 DEG C~480 DEG C, before entering roughing, continuous casting billet warp
1.5s rises again, and the control of the heart table temperature difference is 420 DEG C~380 DEG C, and continuous casting billet later will be by the attemperator 4 with induction heating through roughing
Heat temperature raising is carried out with induction heater 5, in first segment heating, intermediate base is first heated to 1000 DEG C or so, subsequent the
Intermediate base is heated to 1180 DEG C again in two sections of heating.Wherein, by first segment heating setpoint be 1000 DEG C the reason of it is as follows:
1, temperature elevating range is within the heating efficiency that equipment allows, and not will cause original induction heating after improving and set
Standby power dissipation.
2, the phenomenon that unevenly growing up can occur to avoid austenite.
3, when producing micro alloyed steel, alloying element solid solution can be made more abundant.
ESP production line roughing phase method and device are improved by the method for this example, make continuous casting billet along thickness side
To Strain Distribution it is more uniform, center portion deformation is improved, to keep the intermediate base tissue after roughing more uniform, while to thick
Bringing-up section equipment after rolling is replaced, and changes original heating cycle, and not only can overcome the disadvantages that causes in after rolling because cooling before rolling
Between base temperature it is relatively low, single heating equipment heat up scarce capacity possibility, guarantee do not influence subsequent handling under the premise of, reduce
Heating energy consumption, meanwhile, quickly heating can discharge the Strain Accumulation generated in rough rolling process, make the tissue point of intermediate base
Cloth is more uniform；Further improved heating cycle extends intermediate base in the time of high temperature, when producing micro alloyed steel,
Be conducive to the solid solution of alloying element, the alloying element Solid soluble Nb of intermediate base will be promoted before not improving.
The present invention in continuous casting and rolling production line by being added quickly cooling device and attemperator being replaced with band induction
Device comprehensive function in the attemperator of heating, the two and original production line, ensure that the non-homogeneous temperature in thickness of strand direction
Field distribution is spent, so that continuous casting billet Strain Distribution of thickness direction in rough rolling process is more uniform rationally, while reducing heating
Energy consumption, the temperature by accurately controlling finish rolling entrance control, flexibly control heating temperature, when producing micro alloyed steel, conveniently mention
The alloy solid solution rate of base, improves mechanical property between senior middle school.
Energy consumption is heated in reduction described herein, refer to after roughing intermediate base there are when the heart table temperature difference to its into
Row heating, i.e., the temperature of center portion is heated before not diffusing to surface, and the thickness heated at this time will become smaller, and is being heated to similarly
When heating target temperature, reduce heating energy consumption.
Those skilled in the art is not under conditions of departing from the spirit and scope of the present invention that claims determine, also
Various modifications can be carried out to the above content.Therefore the scope of the present invention is not limited in above explanation, but by
The range of claims determines.
Claims (5)
1. a kind of ESP production line roughing section microstructure homogenization rolling system, including conticaster, quickly cooling device, roughing mills,
Attemperator with induction heating, induction heater, high pressure descaling machine and mm finishing mill unit, which is characterized in that in the conticaster
Outlet and the roughing mills entrance between arrange the quickly cooling device, the quickly cooling device to continuous casting billet into
Row is quickly cooled down, and controls the heart table temperature difference of continuous casting billet between 520 DEG C to 480 DEG C, the intermediate region after roughing before finish rolling,
Attemperator and induction heater with induction heating are set, for carrying out two sections of heating to the intermediate base after roughing.
2. ESP production line roughing section microstructure homogenization rolling system as described in claim 1, which is characterized in that described quick
Cooling device is injected in the entrance distance of the cooling water positional distance roughing mills on the continuous casting billet no more than 0.15m.
3. ESP production line roughing section microstructure homogenization rolling system as described in claim 1 or 2, which is characterized in that described
The length of quickly cooling device is set as 0.85-1.2m.
4. the ESP production line roughing section microstructure homogenization rolling system as described in claim 1 or 3, which is characterized in that described
Attemperator with induction heating is the device for first carrying out induction heating and subsequently entering heat preservation.
5. a kind of ESP that the ESP production line roughing section microstructure homogenization rolling system using one of claim 1-4 carries out is produced
Line roughing section microstructure homogenization milling method, which is characterized in that the continuous casting billet first passes through fast before entering the roughing mills
Fast cooling device is controlled cooling ratio in 2500W/ (m by adjusting hydraulic pressure and water yield2K) left and right, cooling time is
8~10s, through cooling, the heart table temperature difference of continuous casting billet is controlled at 520 DEG C~480 DEG C, and before entering roughing, continuous casting billet is returned through 1.5s
Temperature, the control of the heart table temperature difference are 420 DEG C~380 DEG C, and the intermediate base through being formed after roughing will be by the attemperator with induction heating
Heat temperature raising is carried out with induction heater, in first segment heating, intermediate base is first heated to 1000 DEG C or so, subsequent second
Intermediate base is heated to 1180 DEG C again in Duan Jiare.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811297751.9A CN109482648B (en) | 2018-10-31 | 2018-10-31 | ESP production line rough rolling section tissue homogenization rolling system and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811297751.9A CN109482648B (en) | 2018-10-31 | 2018-10-31 | ESP production line rough rolling section tissue homogenization rolling system and method thereof |
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| Publication Number | Publication Date |
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| CN109482648A true CN109482648A (en) | 2019-03-19 |
| CN109482648B CN109482648B (en) | 2020-08-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021258578A1 (en) * | 2020-06-23 | 2021-12-30 | 中冶赛迪工程技术股份有限公司 | Thin strip production process employing continuous casting and rolling |
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| JP2005014039A (en) * | 2003-06-25 | 2005-01-20 | Sanyo Special Steel Co Ltd | Manufacturing method of rolled steel block for preventing surface defect caused during continuous casting and following bloom rolling |
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| WO2021258578A1 (en) * | 2020-06-23 | 2021-12-30 | 中冶赛迪工程技术股份有限公司 | Thin strip production process employing continuous casting and rolling |
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| Publication number | Publication date |
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| CN109482648B (en) | 2020-08-11 |
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