CN116967281A - Pattern plate and preparation method thereof - Google Patents
Pattern plate and preparation method thereof Download PDFInfo
- Publication number
- CN116967281A CN116967281A CN202310915278.0A CN202310915278A CN116967281A CN 116967281 A CN116967281 A CN 116967281A CN 202310915278 A CN202310915278 A CN 202310915278A CN 116967281 A CN116967281 A CN 116967281A
- Authority
- CN
- China
- Prior art keywords
- rolling
- casting
- finish rolling
- coiling
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 238000005096 rolling process Methods 0.000 claims abstract description 117
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 80
- 239000010959 steel Substances 0.000 claims abstract description 80
- 238000005266 casting Methods 0.000 claims abstract description 56
- 238000000034 method Methods 0.000 claims abstract description 36
- 230000004907 flux Effects 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 25
- 230000006698 induction Effects 0.000 claims abstract description 25
- 238000001816 cooling Methods 0.000 claims abstract description 19
- 238000009749 continuous casting Methods 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- 229910001868 water Inorganic materials 0.000 claims description 38
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 28
- 239000004973 liquid crystal related substance Substances 0.000 claims description 20
- 238000004804 winding Methods 0.000 claims description 19
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 14
- 239000000377 silicon dioxide Substances 0.000 claims description 14
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 13
- 239000000292 calcium oxide Substances 0.000 claims description 13
- 235000012239 silicon dioxide Nutrition 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 11
- 229910001948 sodium oxide Inorganic materials 0.000 claims description 11
- 239000000395 magnesium oxide Substances 0.000 claims description 10
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 10
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 10
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 8
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 8
- FUJCRWPEOMXPAD-UHFFFAOYSA-N lithium oxide Chemical compound [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 claims description 8
- 229910001947 lithium oxide Inorganic materials 0.000 claims description 8
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 8
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 8
- 239000000498 cooling water Substances 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 description 30
- 238000004519 manufacturing process Methods 0.000 description 19
- 230000008092 positive effect Effects 0.000 description 18
- 239000002893 slag Substances 0.000 description 15
- 239000008186 active pharmaceutical agent Substances 0.000 description 12
- 238000002844 melting Methods 0.000 description 11
- 230000008018 melting Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- 230000005540 biological transmission Effects 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 244000046052 Phaseolus vulgaris Species 0.000 description 4
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000010079 rubber tapping Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000011737 fluorine Substances 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- -1 fluorine ions Chemical class 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 235000014647 Lens culinaris subsp culinaris Nutrition 0.000 description 1
- 244000043158 Lens esculenta Species 0.000 description 1
- 229910018068 Li 2 O Inorganic materials 0.000 description 1
- 101100021980 Mus musculus Letmd1 gene Proteins 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000006184 cosolvent Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- 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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
-
- 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
-
- 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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B2001/225—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 plates, strips, bands or sheets of indefinite length by hot-rolling
Abstract
The application relates to the technical field of ferrous metallurgy, in particular to a pattern plate and a preparation method thereof. The method comprises the following steps: continuously casting the molten steel by using the casting powder with the set chemical components, and controlling the drawing speed of the continuous casting to obtain a casting blank; heating the casting blank to enable the casting blank to have a target temperature; rolling the heated casting blank to obtain a hot rolled plate; wherein the rolling comprises: rough rolling is carried out on the heated casting blank so as to obtain an intermediate blank with a target thickness; carrying out transverse magnetic flux induction heating on the intermediate blank, carrying out finish rolling, and controlling the technological parameters of the finish rolling; and performing laminar cooling on the hot rolled plate by adopting a back-stage cooling mode, coiling, and controlling the coiling technological parameters to obtain the checkered plate. The method can be used for continuously detecting the thickness specification of the checkered plate on the premise of ensuring the rolling stability, can be used for preparing the capacity of the checkered plate with the specification of less than or equal to 1.2mm, and has no obvious fluctuation of the quality of the strip steel caused by flat rolls.
Description
Technical Field
The application relates to the technical field of ferrous metallurgy, in particular to a pattern plate and a preparation method thereof.
Background
The checkered plates in China are successfully manufactured by semi-continuous rolling of saddle steel in the 60 th century, and become a typical product variety of a hot continuous rolling unit. Currently, hot rolled checkered plates mainly include single checkered plates such as lentil-shaped checkered plates, diamond-shaped checkered plates, and round bean-shaped checkered plates, and simple combined checkered plates (lentil+round bean). The checkered plate has good surface friction and good anti-skid performance due to the existence of the surface checkered beans, and is widely applied to industries such as automobile bottom plates, construction, machinery manufacturing, transportation, shipbuilding and the like.
In particular, in recent years, with the continuous increase of the number of continuous thin slab casting and rolling lines and the changes of market requirements and cost control of manufacturing enterprises, higher, newer and stricter requirements are put on the production of checkered plates, and the following aspects are mainly focused: (1) The larger pattern outline size is required to have both aesthetic property and wear resistance; (2) The lower production cost mainly comprises roller consumption, roller processing cost and leveling cost in the production process; (3) Development of thin pattern plates, especially 1.2mm and below.
However, because the production process of the checkered plates is complex, the rolling stability of a rolling mill and the winding shape requirement of a coiling machine are high, and meanwhile, the processing cost of a roller and the roller consumption are high, so that domestic enterprises with stable and mass-production thin-specification checkered plates production and research capability are relatively few, the yield and variety of the checkered plates cannot meet the market requirement, and the market potential is huge.
Disclosure of Invention
The application provides a pattern plate and a preparation method thereof, which are used for solving the technical problem that the existing pattern plate is difficult to simultaneously consider thin specification and good surface quality.
In a first aspect, the present application provides a method for producing a checkered plate having a thickness of 1.2mm or less, the method comprising:
continuously casting the molten steel by using the casting powder with the set chemical components, and controlling the drawing speed of the continuous casting to obtain a casting blank;
heating the casting blank to enable the casting blank to have a target temperature;
rolling the heated casting blank to obtain a hot rolled plate; wherein the rolling comprises:
rough rolling is carried out on the heated casting blank so as to obtain an intermediate blank with a target thickness;
carrying out transverse magnetic flux induction heating on the intermediate blank, carrying out finish rolling, and controlling the technological parameters of the finish rolling;
and performing laminar cooling on the hot rolled plate by adopting a back-stage cooling mode, coiling, and controlling the coiling technological parameters to obtain the checkered plate.
Optionally, the setting chemical composition includes:
calcium oxide, fixed carbon, whole water, silicon dioxide, aluminum oxide, ferric oxide, fluoride ion, lithium oxide, magnesium oxide and sodium oxide; wherein, the weight percentage is calculated,
the sodium oxide is 8.20-9.20%, the fluoride ion is 9.10-10.10%, the calcium oxide is 29.80-35.80%, the fixed carbon is 5.20-6.20%, the total water is less than or equal to 0.50%, the silicon dioxide is 21.50-27.50%, the aluminum oxide is 5.30-6.30%, the ferric oxide is less than or equal to 1%, the lithium oxide is 0.90-1.90%, the magnesium oxide is 3.50-4.50%, and the weight ratio of the calcium oxide to the silicon dioxide is 1.29-1.39.
Optionally, the continuous casting has a pulling rate of not less than 4.9m/min.
Optionally, the target temperature is 1165-1195 ℃.
Optionally, the target thickness is 15-20mm.
Optionally, the process parameters of the finish rolling include: finish rolling inlet temperature and finish rolling outlet temperature; wherein, the liquid crystal display device comprises a liquid crystal display device,
the finish rolling inlet temperature is 1190-1230 ℃,
the difference between the finish rolling inlet temperature and the finish rolling outlet temperature is 370-400 ℃.
Optionally, the rolling the heated casting blank to obtain a hot rolled plate includes:
rolling the heated casting blank, and controlling the dephosphorization pressure in the rolling process to obtain a hot rolled plate; wherein, the liquid crystal display device comprises a liquid crystal display device,
the dephosphorization pressure is 320-340MPa.
Optionally, the rolling the heated casting blank to obtain a hot rolled plate includes:
rolling the heated casting blank, and controlling the water consumption mode of rolling to obtain a hot rolled plate; wherein, the water consumption mode of rolling includes:
starting the second rough rolling frame working roll, the second finish rolling frame working roll and the second finish rolling frame working roll to prevent stripping and falling into water;
at the fine descaling inlet and the fine descaling outlet, 1/4 cooling water is started for the strip steel;
and spraying water on the opening side of the third finishing mill frame, the fourth finishing mill frame and the fifth finishing mill frame.
Optionally, the technological parameters of coiling include:
the coiling temperature, the coiling diameter of the hard core section, the coiling tension of the hard core section and the auxiliary roller pressure; wherein, the liquid crystal display device comprises a liquid crystal display device,
the coiling temperature is 550-580 ℃, and the coil diameter of the hard core section is 820-845mm; the coiling tension of the hard core coiled section is 27.5-30KN; the pressure of the auxiliary winding roller is 40-55KN.
In a second aspect, the present application provides a checkered plate produced by the method of any one of the embodiments of the first aspect.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the method provided by the embodiment of the application is optimized and improved in terms of production process, and provides a preparation method of the thin pattern plate, wherein the thickness specification of the pattern plate is continuously explored under the premise of ensuring rolling stability, the capacity of preparing the pattern plate with the specification of less than or equal to 1.2mm can be realized, the quality of strip steel caused by flat rolls is not obviously fluctuated, good economic benefit is realized, and the method has stronger guiding significance on other thin slab continuous casting and rolling production lines.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic flow chart of a method for manufacturing a checkered plate according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an induction coil arrangement in induction heating according to an embodiment of the present application; wherein, A-longitudinal magnetic flux induction heating and B-transverse magnetic flux induction heating;
FIG. 3 is a schematic diagram of a traversing carriage of an induction heater according to an embodiment of the present application;
FIG. 4 is a graph showing mechanical properties at different finish rolling inlet temperatures according to an embodiment of the present application; wherein, the A-yield strength curve graph, the B-tensile strength curve graph, OS and DS represent two sides of the strip steel, and OS represents an operation side; DS denotes the transmission side;
FIG. 5 is a microstructure topography of a checkered plate at different finish rolling outlet temperatures provided in an embodiment of the present application; wherein, A-820 ℃, B-825 ℃, C-830 ℃;
FIG. 6 is a graph showing mechanical properties at different winding temperatures according to an embodiment of the present application; wherein, the A-yield strength curve graph, the B-tensile strength curve graph, OS and DS represent two sides of the strip steel, and OS represents an operation side; DS denotes the transmission side;
FIG. 7 shows the mechanical properties of the inner ring, the outer ring and the middle position of the checkered plate strip steel provided by the embodiment of the application; wherein, the A-yield strength curve graph, the B-tensile strength curve graph, OS and DS represent two sides of the strip steel, and OS represents an operation side; DS denotes the transmission side;
FIG. 8 is a schematic diagram of fluctuation of actual values and set values of winding tension according to an embodiment of the present application;
FIG. 9 is a schematic diagram of a variation in diameter position of a hard core segment according to an embodiment of the present application;
fig. 10 is a schematic diagram of winding tension of a TOP section of strip steel of a coiler according to an embodiment of the present application;
FIG. 11 is a surface quality chart of a checkered plate strip steel provided in example 11 of the present application;
fig. 12 is a surface quality chart of the checkered plate steel strip provided in comparative example 1 of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Various embodiments of the application may exist in a range of forms; it should be understood that the description in a range format is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of the application; it is therefore to be understood that the range description has specifically disclosed all possible sub-ranges and individual values within that range. For example, it should be considered that a description of a range from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5, and 6, wherever applicable. In addition, whenever a numerical range is referred to herein, it is meant to include any reference number (fractional or integer) within the indicated range.
In the present application, unless otherwise specified, terms such as "upper" and "lower" are used specifically to refer to the orientation of the drawing in the figures. In addition, in the description of the present specification, the terms "include", "comprising" and the like mean "including but not limited to". Relational terms such as "first" and "second", and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Herein, "and/or" describing an association relationship of an association object means that there may be three relationships, for example, a and/or B, may mean: a alone, a and B together, and B alone. Wherein A, B may be singular or plural. Herein, "at least one" means one or more, and "a plurality" means two or more. "at least one", "at least one" or the like refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, "at least one (individual) of a, b, or c," or "at least one (individual) of a, b, and c," may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple, respectively.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present application are commercially available or may be prepared by existing methods.
In a first aspect, the present application provides a method for preparing a checkered plate, referring to fig. 1, wherein the thickness of the checkered plate is less than or equal to 1.2mm, the method includes:
s1, continuously casting molten steel by using mold flux with set chemical components, and controlling the continuous casting pulling speed to obtain a casting blank;
in some embodiments, the setting the chemical composition comprises:
calcium oxide, fixed carbon, whole water, silicon dioxide, aluminum oxide, ferric oxide, fluoride ion, lithium oxide, magnesium oxide and sodium oxide; wherein, the weight percentage is calculated,
the sodium oxide is 8.20-9.20%, the fluoride ion is 9.10-10.10%, the calcium oxide is 29.80-35.80%, the fixed carbon is 5.20-6.20%, the total water is less than or equal to 0.50%, the silicon dioxide is 21.50-27.50%, the aluminum oxide is 5.30-6.30%, the ferric oxide is less than or equal to 1%, the lithium oxide is 0.90-1.90%, the magnesium oxide is 3.50-4.50%, and the weight ratio of the calcium oxide to the silicon dioxide is 1.29-1.39. The melting point of the mold flux can be controlled to be 1200-1400 ℃.
In the embodiment of the application, the MCCR production line is different from the traditional sheet billet casting and rolling production line, adopts a casting and rolling integrated mode for production, and the continuous casting and the rolling mill are rigidly connected through the second flow of the strip steel, thus the high requirement on the casting stability is provided. Based on this, when producing the steel grade that the degree of difficulty is higher, adopt transition mode pouring generally, the steel grade that the heat of starting to water selects the risk to use to pour, after the steady transition, carry out the pouring of checkered plate from the second stove. Because the components of the steel types are different (the components of different steel types should be not different), the tonnage of the tundish is controlled differently and the pulling speed is different. The lower limit of the C content of the checkered plate is set to 0.175 and is close to a peritectic zone (0.08-0.17), so that the composition of the casting powder used in the continuous casting process is controlled for stability in casting.
Sodium oxide (Na) 2 The positive effect of the O) content of 8.20-9.20 percent is that: sodium oxide can promote covering slagThe transparent glass state is presented, and the lubrication function of the slag film is effectively improved. If the content of the sodium oxide is excessive, the alkalinity of the protecting slag is reduced to a certain extent, so that the protecting slag is denatured; if the content of sodium oxide is too small, the basicity of the mold flux is too high to some extent, thereby affecting the ability of the mold flux to adsorb inclusions. Specifically, the content of the sodium oxide may be 8.20%, 8.80%, 9.20%, or the like.
Controlling fluoride ion (F) - ) The content of (3) is 9.10-10.10 percent: the melting point and viscosity of the casting powder can be reduced, the crystallization performance can be regulated, and the reaction mechanical conditions between slag and metal or between slag and inclusion can be improved. Acting as a cosolvent and a diluent. If the content of the fluorine ions is excessive, the cost is increased to a certain extent, and meanwhile, the volatilization of fluorine is caused, so that the human health is influenced after the adsorption; if the content of the fluorine ions is too small, the melting property of the mold flux is affected to some extent, and the mold flux is easily caused. Specifically, the content of the fluoride ion may be 9.10%, 9.60%, 10.10%, or the like.
The positive effect of controlling the content of calcium oxide (CaO) to be 29.80-35.80 percent: the capability of the covering slag to dissolve inclusions can be improved. Specifically, the content of the calcium oxide may be 29.80%, 32.80%, 35.80%, or the like.
Positive effect of controlling the content of Fixed Carbon (FC) to 5.20-6.20%: the carbon in the protective slag exists in a fixed carbon mode, so that the blocking of the protective slag can be prevented, the melting of the protective slag is facilitated, and the melting rate of the protective slag can be effectively controlled. Specifically, the content of the fixed carbon may be 5.20%, 5.80%, 6.20%, or the like.
The positive effect of controlling the content of the whole water (Mt) to be less than or equal to 0.50 percent is that: the lower the water content in the covering slag is, the lower the [ H ] element is, and the unstable pulling speed caused by the overhigh [ H ] element can be reduced. Specifically, the total water content may be 0.50%, 0.40%, 0.30%, etc.
Control silicon dioxide (SiO) 2 ) The content of (3) is 21.50-27.50 percent: siO2 has a high melting point and high component stability, so that the stability of the mold flux can be maintained when used at high temperature. Specifically, the silica content may be 21.50%, 25.50%, 27.50%, etc.
Controlling aluminum oxide (Al) 2 O 3 ) The content of (3) is 5.30-6.30 percent: the alumina mainly improves the fluidity of the mold flux, so that the mold flux is not easy to crust and can be uniformly covered on the upper opening of the crystallizer. Specifically, the content of the aluminum oxide may be 5.30%, 5.80%, 6.30%, or the like.
Controlling ferric oxide (Fe) 2 O 3 ) The positive effects of the content of (1%) is less than or equal to: mainly controlling the oxidability of the protective slag. Specifically, the content of the ferric oxide may be 1%, 0.8%, or the like.
Lithium oxide control (Li) 2 The positive effect of the O) content of 0.90-1.90 percent: has great influence on the viscosity, melting temperature and glass performance of the mold flux. Specifically, the content of the lithium oxide may be 0.90%, 1.50%, 1.90%, or the like.
Positive effect of controlling the content of magnesium oxide (MgO) to 3.50-4.50%: the melting temperature and viscosity of the casting powder can be reduced, and the melting speed of the casting powder can be increased, so that the billet is not easy to crack under the condition of higher pulling speed. Specifically, the content of the magnesium oxide may be 3.50%, 4.0%, 4.5%, etc.
The weight ratio of the calcium oxide to the silicon dioxide is also the alkalinity R of the protective slag, and the positive effect of controlling the weight ratio of the calcium oxide to the silicon dioxide to be 1.29-1.39 is that: it is an important index reflecting the ability of the covering slag to absorb the inclusions in the molten steel. If the alkalinity R is too large, the crystallization temperature of slag is increased to a certain extent, so that the temperature of molten steel is increased, not only is corrosion resistance materials such as a tundish increased, but also the superheat degree is increased, and casting is affected; if the basicity R is too small, the ability of the mold flux to adsorb inclusions is affected to some extent. Specifically, the basicity R may be 1.29, 1.26, 1.39, etc.
In some embodiments, the continuous casting has a draw rate of ≡4.9m/min.
The positive effect of controlling the continuous casting pulling rate to be more than or equal to 4.9m/min is that: the continuous casting and rolling production line pull speed is a rolling basis, the pull speed is stabilized at 4.9m/min or more, the finish rolling inlet temperature can be effectively ensured to be in a reasonable interval range, and the flat rolls of the checkered plates are effectively prevented from happening. If the pulling speed is too low, the temperature of the finish rolling inlet is too high to a certain extent, so that the phase change is not easy to occur, and the performance of the steel coil is affected. Specifically, the drawing speed of the continuous casting may be 4.9m/min, 5.0m/min, 5.1m/min, or the like.
In this continuous casting process, further comprising: the baking temperature of the tundish is 3.5-4.5h, the baking temperature is 1100-1150 ℃, and the pouring of the checkered plate is controlled by adopting a narrow window at the temperature, so that the falling of the tundish refractory material caused by overlong baking time of the tundish is avoided, and the quality of molten steel is influenced;
before casting, ensuring that no sundries exist in the tundish, and blowing argon in the whole casting process, wherein the argon blowing flow is 80-120L/min and the pressure is 0.4Mpa;
the weight of the ladle in the starting furnace is controlled according to 30-35t, the continuous casting furnace is controlled to 38-42t, the temperature of molten steel in the ladle is 1529-1544 ℃, and the superheat degree is executed according to 12-27 ℃;
in the casting process, the absolute value of the fluctuation of the liquid level of the crystallizer is 0-3mm.
S2, heating the casting blank to enable the casting blank to have a target temperature;
in some embodiments, the target temperature is 1165-1195 ℃.
In the embodiment of the application, the heating is performed in a tunnel furnace, and the heat value of the gas of the tunnel furnace is set according to 2400Kcal/m < 3 >. The target temperature represents the tapping temperature of the casting blank, and the positive effect of controlling the tapping temperature of the casting blank to be 1165-1195 ℃ is that: when the tapping temperature is low, the temperature difference between the middle part and the edge part of the strip steel is easily caused to be too large, so that the skin-lifting defect is caused, and once the skin-lifting defect is caused on the surface of the bean or the edge position of the bean, the wear resistance of the checkered plate is greatly influenced. Specifically, the tapping temperature of the cast slab may be 1165 ℃, 1185 ℃, 1195 ℃, or the like.
S3, rolling the heated casting blank to obtain a hot rolled plate; wherein the rolling comprises:
rough rolling is carried out on the heated casting blank so as to obtain an intermediate blank with a target thickness;
carrying out transverse magnetic flux induction heating on the intermediate blank, carrying out finish rolling, and controlling the technological parameters of the finish rolling;
in some embodiments, the target thickness is 15-20mm.
The positive effect of controlling the thickness of the intermediate blank to be 15-20 mm: if the thickness of the intermediate blank is too large, although the deformation amount in the finish rolling process is increased, the temperature drop speed is reduced, if the water cooling process of the intermediate blank is not matched, the temperature waiting time is increased, the production efficiency is reduced, and meanwhile, the influence of the excessive deformation amount on the final structure and performance is also obviously reduced; if the thickness of the intermediate blank is too small, the deformation degree in the rough rolling stage is increased, the temperature drop in the finish rolling stage is accelerated, but the deformation degree is slightly small, so that the load distribution of a double machine (or two stages of rough rolling and finish rolling) is unbalanced, and the influence of the finish rolling stage on refining recrystallized austenite grains, improving the effective grain boundary area and promoting the transformation to ferrite can be reduced. And the temperature drop of the edge part of the slab is overlarge due to the fact that the intermediate slab is too thin, the temperature drop of the edge part of the strip steel is further deepened after the strip steel passes through a descaling machine, and therefore the quantity of rolled skin tilting is increased. Specifically, the thickness of the intermediate blank may be 15mm, 18mm, 20mm, or the like. When the thickness of the intermediate billet is 18mm, the rolling effect is optimal.
The positive effect of transverse magnetic flux induction heating of the intermediate blank: the Induction Heater (IH) is positioned in the middle of rough rolling and finish rolling, and is mainly used for heating the strip steel, so that the strip steel can ensure a certain rolling temperature and prevent stability deterioration caused by rolling load.
The induction heating of the plate strip can be generally classified into longitudinal magnetic flux induction heating (see fig. 2 (a)) and transverse magnetic flux induction heating (see fig. 2 (B)) depending on the arrangement of the induction coils. When the transverse magnetic flux induction heating is performed, magnetic fluxes generated by the same-direction alternating current in the two groups of symmetrically placed coils are perpendicular to the surface of the plate strip, the eddy currents are parallel to the strip, and the problem of mutual offset is avoided, so that the defect in the longitudinal magnetic flux induction heating can be avoided.
The induction heater coil (see the schematic diagram of the induction heater traverse shown in fig. 3) proceeds by moving the trolley by displacement, the working position of the coil in the horizontal direction is determined by the width and thickness of the slab, and the corresponding Q value, that is, the relative distance between the edge of the slab and the edge of the IH coil, is selected by applying the slab specification corresponding to the coil overlap range of the induction heater traverse shown in table 1. The heating output power of IH is set according to different intermediate blank specifications (rolling speed, thickness and width), and meanwhile, the temperature detection of the inlet area and the outlet area of IH is compared, and the IH is continuously adaptively adjusted. IH heating control is a negative feedback temperature control loop, the target temperature of finish rolling inlet and the detection of IH outlet temperature are used for comparison control, and the difference between temperature setting and feedback is used for correcting the input power of a heating frequency converter. At present, 7 groups of induction heating devices are adopted, so that the uniformity of the strip steel in the width direction can be effectively ensured.
Table 1 induction heater cross car coil overlap range
In some embodiments, the process parameters of the finish rolling include: finish rolling inlet temperature and finish rolling outlet temperature; wherein, the liquid crystal display device comprises a liquid crystal display device,
the finish rolling inlet temperature is 1190-1230 ℃,
the difference between the finish rolling inlet temperature and the finish rolling outlet temperature is 370-400 ℃.
The rolling temperature has important influence on the performance of the checkered plate, the temperature setting is unreasonable, and the checkered plate can generate flat coil defects. Therefore, the establishment of a reasonable temperature system plays a decisive role in the quality of the product.
Positive effect of controlling finish rolling inlet temperature (FET) to 1190-1230 ℃: please refer to the graph of mechanical properties at different finish rolling inlet temperatures shown in fig. 4; wherein, the A-yield strength curve graph, the B-tensile strength curve graph, OS and DS represent two sides of the strip steel, and OS represents an operation side; DS denotes the transmission side; this fig. 4 shows that as the FET decreases, the strength decreases. The plate width direction shows the phenomena of high middle strength and low strength at two sides, the middle strength is about 20-30MPa higher than the two sides, and the higher the temperature of the FET is, the larger the performance difference between the middle and the two sides is, and the specific corresponding relation is provided with the temperature non-uniformity of the steel plate. Specifically, the finish rolling inlet temperature may be 1190 ℃, 1210 ℃, 1230 ℃, or the like.
The positive effect of controlling the difference between finish rolling inlet temperature and said finish rolling outlet temperature (FDT) to be 370-400℃: please refer to the microstructure topography of the checkered plate at different finish rolling outlet temperatures shown in fig. 5; wherein, A-820 ℃, B-825 ℃, C-830 ℃; the texture features of the checkered plate of FIG. 5C are best, lowering the FET temperature and lowering the FET to FDT temperature drop, reducing the prior austenite grain size, and increasing the material strength at high temperature. Specifically, the difference between the finish rolling inlet temperature and the finish rolling outlet temperature may be 370 ℃, 380 ℃, 390 ℃, 400 ℃, or the like. The FET is optimal when the temperature of the FET is 380 ℃ different from the FDT temperature.
In some embodiments, the rolling the heated cast slab to obtain a hot rolled plate includes:
rolling the heated casting blank, and controlling the dephosphorization pressure in the rolling process to obtain a hot rolled plate; wherein, the liquid crystal display device comprises a liquid crystal display device,
the dephosphorization pressure is 320-340MPa.
The positive effect of controlling dephosphorization to be 320-340 MPa: dephosphorization includes coarse dephosphorization and fine dephosphorization. Compared with a pickling plate and a galvanized substrate, the surface requirements of the pattern plate are not very high, and only the surface is ensured to be free from obvious foreign matter pressing in and iron sheet pits, so that a single-row low-pressure mode is adopted for rough descaling. The fine descaling adopts a single row, a No. 2 header is preferentially used, the fine descaling machine has two rows of headers in total, the No. 1 header is closer to the induction heater, and after the No. 1 header is adopted, descaling water easily enters the induction heater, so that a certain cooling effect can be achieved on the surface of the strip steel, and the performance of the strip steel is further affected. The No. 2 header is closer to the F1 inlet, after the No. 2 header is adopted, strip steel can rapidly enter a finish rolling frame for rolling after descaling, and on the premise of ensuring good surface conditions, the strip steel can rapidly roll, so that the strip steel can be further deformed and strengthened, and the strength of the checkered plates is ensured. Specifically, the dephosphorization pressure may be 320MPa, 330MPa, 340MPa, etc. More preferably, the dephosphorization pressure is 330MPa.
In some embodiments, the rolling the heated cast slab to obtain a hot rolled plate includes:
rolling the heated casting blank, and controlling the water consumption mode of rolling to obtain a hot rolled plate; wherein, the liquid crystal display device comprises a liquid crystal display device,
the water consumption mode of rolling includes:
starting the second rough rolling frame working roll (H2), the second finish rolling frame working roll (F1) and the second finish rolling frame working roll (F2) to prevent stripping and falling into water;
at the fine descaling inlet and the fine descaling outlet, 1/4 cooling water is started for the strip steel;
and spraying water on the opening sides of the third finishing mill frame (F3), the fourth finishing mill frame (F4) and the fifth finishing mill frame (F5).
In an embodiment of the application, the anti-spalling water: the anti-stripping water mainly refers to cooling water of a working roll of a machine frame, and is used for preventing the oxidation film of the working roll of the machine frame from stripping to influence the quality of strip steel, and at present, the H2, F1 and F2 machine frames are in an open state when a checkered plate is rolled, and the flow rate of the anti-stripping water is 25m 3 /hr;
1/4 Cooling Water: the 1/4 wave cooling water positions are at the inlet and outlet of the fine descaling, so as to prevent the wave shape at the 1/4 positions on two sides of the strip steel. When the temperature of the strip steel is uneven, the strip steel shape quality is affected, the strip steel performance is also affected, particularly, if the 1/4 position performance of the cross section of the strip steel meets the requirement, the whole section performance can meet the requirement. After 1/4 of cooling water is started, the condition of uneven temperature of the cross section of the strip steel can be effectively relieved.
Side water spraying: in order to finish the side water spraying device between the frames, the previous production line adopts dust removing water, namely, the water flow is sprayed on the strip steel obliquely at a certain angle similar to the scale removing water process, the dust removing water can stay on the strip steel sometimes, and the temperature drop of the strip steel is excessively large as the strip steel enters the next frame, and the temperature drop between the FET-FDT is not excessively large as described in the previous description. In addition, the rolling stability of the strip steel is affected to a certain extent. Based on the method, the F3/F4/F5 frame dust removal water is transformed into side water spraying, and the water does not stay on the surface of the strip steel while cooling the strip steel.
S4, performing laminar cooling on the hot rolled plate by adopting a back-end cooling mode, then coiling, and controlling the coiling technological parameters to obtain the checkered plate.
The adoption of the back-end cooling mode has the positive effects that the hot rolled plate is subjected to laminar cooling: the layer cold water distribution and the outlet of the finishing mill and the coiling machine are mainly used for reducing the temperature of the strip steel so as to ensure good performance. However, when the checkered plate is rolled, the cold water is started to cause the strip steel performance to be greatly different, and after the strip steel is coiled, the strip steel performance is characterized in that the inner ring is more than the outer ring is more than the middle, and the mechanical properties of the inner ring, the outer ring and the middle position of the checkered plate strip steel shown in figure 7 can be seen; wherein, the A-yield strength curve graph, the B-tensile strength curve graph, OS and DS represent two sides of the strip steel, and OS represents an operation side; DS denotes the transmission side; the yield strength of the inner ring is about 59-101MPa higher than that of the middle position, the middle performance is lower due to the difference of the performances of the inner ring and the outer ring of the strip steel, and the phenomenon of flat coil appears during coiling. Thus, the layer cooling mode selects the back stage cooling when rolling the checkered plate. The cooling in the later stage can increase the air cooling time of the strip steel, inhibit the generation of proeutectoid ferrite, reduce the diffusion distance of carbon elements, avoid generating massive carbon-rich structures, promote the uniformity of the distribution of the hot rolled product structure, increase the deformation of the non-recrystalized region of finish rolled austenite, and be favorable for improving the performance uniformity of the product.
In some embodiments, the process parameters of the reeling include:
coiling temperature, coiling diameter of the hard core section, coiling tension of the hard core section and auxiliary roller pressure; wherein, the liquid crystal display device comprises a liquid crystal display device,
the coiling temperature is 550-580 ℃, and the coil diameter of the hard core section is 820-845mm; the coiling tension of the hard core coiled section is 27.5-30KN; the pressure of the auxiliary winding roller is 40-55KN.
The positive effect of controlling the coiling temperature to be 550-580℃ is that: ensuring the yield strength and the tensile strength of the checkered plate can be seen from the graph of mechanical properties at different coiling temperatures shown in FIG. 6; wherein, the A-yield strength curve graph, the B-tensile strength curve graph, OS and DS represent two sides of the strip steel, and OS represents an operation side; DS denotes the transmission side. Specifically, the temperature of the winding may be 550 ℃, 560 ℃, 570 ℃, 580 ℃, or the like.
The roll diameter of the hard core section is controlled to be 820-845mm, and the roll tension of the hard core roll section is controlled to be 27.5-30 KN: after the coiling machine mandrel reaches a full-expansion state, a tension control relation is established between the strip steel and the coiling machine, the tension of the coiling machine gradually decreases along with the increase of the coiling diameter, a step tension control mode is presented, the actual coiling tension value and the set value fluctuate by about 1KN, and a schematic diagram of fluctuation of the actual coiling tension value and the set value is shown in FIG. 8. When the coiling machine is used for coiling strip steel, the coiling tension can be continuously adjusted along with the continuous increase of the coil diameter of the steel coil. This is why the actual reeling tension mentioned above fluctuates in a range. The flat coil is easy to occur to the strip steel, and the performances of the inner ring, the middle ring and the outer ring are different, so that the force of the core part after the strip steel is coiled can not support the weight of the whole strip steel, and the flat coil is caused. For this, it is proposed to increase the diameter length of the hard core segment, and reference is made to the schematic diagram of the change in the diameter position of the hard core segment shown in fig. 9. The hard core section is the strip steel which is firstly contacted with the mandrel, and the larger the diameter is, the stronger the strip steel core strength is, and the strip steel is less prone to flat rolling. Specifically, the winding diameter of the hard core section may be 820mm, 835mm, 845mm, etc., and the winding tension of the hard core winding section may be 27.5KN, 28.5KN, 30KN, etc.
The positive effect of controlling the pressure of the auxiliary winding roller to be 40-55KN is that: after the tail part of the strip steel is sheared by the high-speed flying shears, the strip steel is led into the mandrel by the auxiliary winding roller of the winding machine for winding, and in order to ensure good winding shape, the auxiliary winding roller is required to carry out auxiliary winding on the steel coil in a stepping control mode, so that the pressure of the auxiliary winding roller can also influence the strip steel, in particular the shape of the tail part of the strip steel. See the schematic drawing of the coiling tension of the TOP section of the strip steel of the coiling machine; specifically, the wrapper roll pressure may be 40KN, 45KN, 50KN, 55KN, etc.
In a second aspect, the present application provides a checkered plate produced by the method of any one of the embodiments of the first aspect.
The pattern board is realized based on the preparation method of the pattern board, and specific steps of the preparation method of the pattern board can refer to the embodiment, and as the pattern board adopts part or all of the technical schemes of the embodiment, the pattern board has at least all the beneficial effects brought by the technical schemes of the embodiment, and the detailed description is omitted.
The application will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. The experimental procedures, which are not specified in the following examples, are generally determined according to national standards. If the corresponding national standard does not exist, the method is carried out according to the general international standard, the conventional condition or the condition recommended by the manufacturer.
The embodiment of the application provides a preparation method of a checkered plate, wherein the thickness of the checkered plate is less than or equal to 1.2mm, and the method comprises the following steps:
s1, continuously casting molten steel by using mold flux with set chemical components, and controlling the continuous casting pulling speed to obtain a casting blank;
s2, heating the casting blank to enable the casting blank to have a target temperature;
s3, rolling the heated casting blank to obtain a hot rolled plate; wherein the rolling comprises:
rough rolling is carried out on the heated casting blank so as to obtain an intermediate blank with a target thickness;
carrying out transverse magnetic flux induction heating on the intermediate blank, carrying out finish rolling, and controlling the technological parameters of the finish rolling;
s4, performing laminar cooling on the hot rolled plate by adopting a back-end cooling mode, then coiling, and controlling the coiling technological parameters to obtain the checkered plate. See tables 2 and 3 for specific process parameters.
TABLE 2 chemical composition (wt%) and melting point (. Degree.C.) of mold flux
| Sequence number | CaO | FC | Mt | SiO 2 | Al 2 O 3 | Fe 2 O 3 |
| Example 1 | 29.80 | 5.20 | 0.40 | 21.50 | 5.30 | 0.8 |
| Example 2 | 35.80 | 6.20 | 0.5 | 27.50 | 6.3 | 1.0 |
| Example 3 | 33.0 | 5.80 | 0.46 | 25.0 | 6.0 | 0.9 |
| Comparative example 1 | 25.80 | 2.20 | 0.40 | 17.50 | 3.30 | 0.8 |
| Sequence number | R | F - | Li 2 O | MgO | Na 2 O | Melting point |
| Example 1 | 1.39 | 9.10 | 0.90 | 3.50 | 8.20 | 1315 |
| Example 2 | 1.30 | 10.10 | 1.90 | 4.50 | 9.20 | 1389 |
| Example 3 | 1.32 | 9.60 | 1.50 | 4.0 | 8.70 | 1377 |
| Comparative example 1 | 1.45 | 5.7 | 0.6 | 2.8 | 7.2 | 1218 |
Table 3 process parameters for preparing checkered plates
Through the tables 2-3, the quality of the strip steel caused by flat rolls does not obviously fluctuate while the production specification of the checkered plate can be continuously detected, and the surface quality diagram of the checkered plate strip steel shown in the embodiment 1 of fig. 11 can be referred to; the checkered plate prepared in comparative example 1 has obvious flat roll problem, and can be seen from the surface quality diagram of the checkered plate strip steel shown in comparative example 1 in fig. 12.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method of producing a checkered plate, wherein the thickness of the checkered plate is 1.2mm or less, the method comprising:
continuously casting the molten steel by using the casting powder with the set chemical components, and controlling the drawing speed of the continuous casting to obtain a casting blank;
heating the casting blank to enable the casting blank to have a target temperature;
rolling the heated casting blank to obtain a hot rolled plate; wherein the rolling comprises:
rough rolling is carried out on the heated casting blank so as to obtain an intermediate blank with a target thickness;
carrying out transverse magnetic flux induction heating on the intermediate blank, carrying out finish rolling, and controlling the technological parameters of the finish rolling;
and performing laminar cooling on the hot rolled plate by adopting a back-stage cooling mode, coiling, and controlling the coiling technological parameters to obtain the checkered plate.
2. The method of claim 1, wherein the setting the chemical composition comprises:
calcium oxide, fixed carbon, whole water, silicon dioxide, aluminum oxide, ferric oxide, fluoride ion, lithium oxide, magnesium oxide and sodium oxide; wherein, the weight percentage is calculated,
the sodium oxide is 8.20-9.20%, the fluoride ion is 9.10-10.10%, the calcium oxide is 29.80-35.80%, the fixed carbon is 5.20-6.20%, the total water is less than or equal to 0.50%, the silicon dioxide is 21.50-27.50%, the aluminum oxide is 5.30-6.30%, the ferric oxide is less than or equal to 1%, the lithium oxide is 0.90-1.90%, the magnesium oxide is 3.50-4.50%, and the weight ratio of the calcium oxide to the silicon dioxide is 1.29-1.39.
3. The method according to claim 1, wherein the continuous casting has a drawing speed of 4.9m/min or more.
4. The method of claim 1, wherein the target temperature is 1165-1195 ℃.
5. The method of claim 1, wherein the target thickness is 15-20mm.
6. The method according to claim 1, wherein the process parameters of the finish rolling include: finish rolling inlet temperature and finish rolling outlet temperature; wherein, the liquid crystal display device comprises a liquid crystal display device,
the finish rolling inlet temperature is 1190-1230 ℃,
the difference between the finish rolling inlet temperature and the finish rolling outlet temperature is 370-400 ℃.
7. The method according to claim 1 or 6, wherein said rolling of said heated slab to obtain a hot rolled sheet comprises:
rolling the heated casting blank, and controlling the dephosphorization pressure in the rolling process to obtain a hot rolled plate; wherein, the liquid crystal display device comprises a liquid crystal display device,
the dephosphorization pressure is 320-340MPa.
8. The method according to claim 1 or 6, wherein said rolling of said heated slab to obtain a hot rolled sheet comprises:
rolling the heated casting blank, and controlling the water consumption mode of rolling to obtain a hot rolled plate; wherein, the water consumption mode of rolling includes:
starting the second rough rolling frame working roll, the second finish rolling frame working roll and the second finish rolling frame working roll to prevent stripping and falling into water;
at the fine descaling inlet and the fine descaling outlet, 1/4 cooling water is started for the strip steel;
and spraying water on the opening side of the third finishing mill frame, the fourth finishing mill frame and the fifth finishing mill frame.
9. The method according to claim 1, characterized in that the process parameters of the reeling comprise:
the coiling temperature, the coiling diameter of the hard core section, the coiling tension of the hard core section and the auxiliary roller pressure; wherein, the liquid crystal display device comprises a liquid crystal display device,
the coiling temperature is 550-580 ℃, and the coil diameter of the hard core section is 820-845mm; the coiling tension of the hard core coiled section is 27.5-30KN; the pressure of the auxiliary winding roller is 40-55KN.
10. A checkered plate, characterized in that it is produced by the method according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310915278.0A CN116967281A (en) | 2023-07-25 | 2023-07-25 | Pattern plate and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310915278.0A CN116967281A (en) | 2023-07-25 | 2023-07-25 | Pattern plate and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116967281A true CN116967281A (en) | 2023-10-31 |
Family
ID=88482665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310915278.0A Pending CN116967281A (en) | 2023-07-25 | 2023-07-25 | Pattern plate and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116967281A (en) |
-
2023
- 2023-07-25 CN CN202310915278.0A patent/CN116967281A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101941021B (en) | Method for producing extra-deep drawing cold-rolled steel plate based on ASP process | |
| CN100567519C (en) | A kind of production technique of the deep-draw level cold-rolled steel sheet based on CSP technology | |
| CN109338236B (en) | Easily-welded carbon structural steel based on thin strip casting and rolling and manufacturing method thereof | |
| CN106148803B (en) | A kind of production method of deep-draw battery case steel | |
| CN108265227A (en) | A kind of electronic component high-precision ultra-thin cold-rolled strip and its production method | |
| CN100560773C (en) | A kind of high-strength anti-fatigue steel products and manufacture method thereof | |
| CN103008587B (en) | A kind of thin strap continuous casting anti-oxidation iron sheet generation method | |
| CN101139685A (en) | High-strength antifatigue steel products and method for manufacturing same | |
| CN101892419B (en) | Method for producing low-carbon low-silicon high magnetic induction non-oriented electrical steel plate by CSP process | |
| CN105018842B (en) | Method for producing steel belt for low-carbon niobium-microalloyed stamping through thin slab continuous casting and rolling | |
| CN100404149C (en) | Sheet slab C-Mn excellent high-strength sheet-band steel production process | |
| CN113862552A (en) | Steel wire rod for welding and preparation method thereof | |
| CN111842489B (en) | Method for improving surface quality of hot-rolled pipeline steel | |
| CN112080690A (en) | DC06 automobile plate hot-rolled strip steel and control method for edge warping defect thereof | |
| CN103741018A (en) | Method for producing light hot rolling H-shaped steel for automobile beam | |
| CN116967281A (en) | Pattern plate and preparation method thereof | |
| CN113550433B (en) | Hot-rolled X-shaped steel and hot-rolling forming process thereof | |
| CN113145642B (en) | Pickling plate and preparation method thereof | |
| CN104388816A (en) | Low-carbon steel plate with ultralow yield-strength ratio and manufacturing method thereof | |
| CN113025887B (en) | DH980 steel with high edge quality and preparation method thereof | |
| CN113235011B (en) | Method for reducing blackening defect of surface of 550 MPa-level low-alloy high-strength steel | |
| CN113714288B (en) | Production method of hot-rolled strip steel for low-cost low-yield-strength DC01 cold-rolled sheet | |
| JPS62161919A (en) | Manufacture of hard sheet steel for can excellent in drawability and minimized in anisotropy | |
| JPS5861228A (en) | Production of original black plate for ultra thin galvanized steel plate having excellent shape | |
| CN116944246A (en) | Steel for pickling automobile and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |