CN112692056A - Production process of ultrathin hot-rolled checkered plate with thickness of less than 1mm - Google Patents
Production process of ultrathin hot-rolled checkered plate with thickness of less than 1mm Download PDFInfo
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- CN112692056A CN112692056A CN202011611358.XA CN202011611358A CN112692056A CN 112692056 A CN112692056 A CN 112692056A CN 202011611358 A CN202011611358 A CN 202011611358A CN 112692056 A CN112692056 A CN 112692056A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- 238000005096 rolling process Methods 0.000 claims abstract description 89
- 238000001816 cooling Methods 0.000 claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000010408 sweeping Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 6
- 241000277275 Oncorhynchus mykiss Species 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims 2
- 230000008520 organization Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
Classifications
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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
- B21B1/22—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
- B21B1/24—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 in a continuous or semi-continuous process
- B21B1/26—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 in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
-
- 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
- B21B37/46—Roll speed or drive motor control
-
- 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
-
- 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
- B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/02—Winding-up or coiling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a production process of an ultrathin hot-rolled checkered plate with the thickness of less than 1mm, and relates to the technical field of checkered plate rolling. The invention adopts a conventional hot continuous rolling mill and makes a special production plan, carries out rough rolling and finish rolling on a plate blank from a heating furnace, controls a process system in the rough rolling and finish rolling processes, and adopts a head-off cooling and sparse cooling mode to cool strip steel so as to roll an ultrathin checkered plate with the thickness of less than 1.0 mm. The invention provides a method for producing ultrathin checkered plates with the thickness of below 1.0mm by utilizing a conventional hot continuous rolling mill, which combines the special technology of laminar cooling, namely sparse cooling and head-yielding cooling and sweeping device, solves the problem that the conventional rolling mill is difficult to produce the checkered plates with thin specifications, and stably produces the checkered plates with the thickness of below 1.0mm in batches. The width of the production organization of the conventional rolling mill is combined, the width specification is diversified, the limitation of single width specification of the endless rolling mill is avoided, and the production practicability is realized.
Description
Technical Field
The invention relates to the technical field of checkered plate rolling, in particular to a production process of an ultrathin hot-rolled checkered plate with the thickness of less than 1 mm.
Background
The checkered plate is widely applied to the fields of buildings, ships, transportation and machinery manufacturing due to the advantages of elegant appearance, good anti-skidding effect and wear resistance. At present, the decorative pattern plate that the market circulates is generally more than 2.5mm in thickness, under the prerequisite that does not influence performance and pleasing to the eye, the decorative pattern plate should accomplish the lightweight as far as possible, reduces decorative pattern plate thickness specification, improves decorative pattern plate intensity, can effectively reduce the use amount of steel, practices thrift manufacturing cost.
The ultrathin hot-rolled checkered plate has high production difficulty, few manufacturers capable of stably supplying goods at home and abroad are available, various production accidents are frequent even if the ultrathin hot-rolled checkered plate is produced in small batches, and the production cost is high, so that the profitability is reduced.
Disclosure of Invention
In order to solve the technical problems, the invention provides a production process of an ultrathin hot-rolled checkered plate with the thickness of less than 1mm, which greatly reduces the production cost and enlarges the profitability.
In order to realize the technical purpose, the invention adopts the following scheme: the production process of the ultrathin hot-rolled checkered plate with the thickness of less than 1mm comprises the following steps:
s1, heating the steel blank in a heating furnace at 1280 +/-20 ℃ for 180-200 min, wherein the discharging temperature of the plate blank is 1250 +/-20 ℃;
s2, discharging the plate blank out of the furnace, and then entering a rough rolling area, wherein the rough rolling area adopts two rolling mills R1 and R2, each rolling mill rolls three passes, and the rough rolling speed adopts high-speed rolling;
s3, after rough rolling, the steel wire enters a hot coil box for intermediate heat preservation, the threading speed of the hot coil box is 3.9m/S, the coiling speed is 4.5m/S, the hot coil box enters a finish rolling area after coming out, the finish rolling area is provided with 7 stands, the last stand rolling machine F7 is a pattern rolling machine, and the screw-down rate of the F7 stand is 15-18%;
s4, carrying out laminar cooling on the rolled strip steel, wherein the laminar cooling mode adopts a sparse cooling mode, and the head of the strip steel adopts a head-yielding cooling mode;
and S5, coiling the cooled strip steel into a coil.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a method for producing ultrathin checkered plates with the thickness of below 1.0mm by utilizing a conventional hot continuous rolling mill, which is combined with a laminar cooling area, solves the problem that the conventional rolling mill is difficult to produce the checkered plates with thin specifications, and stably produces the checkered plates with the thickness of below 1.0mm in batches. The width of the production organization of the conventional rolling mill is combined, the width specification is diversified, the limitation of single width specification of the endless rolling mill is avoided, and the production practicability is realized.
The preferred scheme of the invention is as follows:
cooling the head, and not pouring layer cold water on the head; and a medium-pressure water belt steel head sweeping device is arranged in the laminar cooling area, and when the head is cooled, the belt head is instantly started to sweep horizontally in the forward direction through the strip steel head sweeping device, so that the strip steel head is pressed down.
Two recoiling machines are adopted in the coiling area, the preferential coiling mode of the latter recoiling machine is adopted, and the valve of the former recoiling machine is lifted up by 10 degrees.
The first-pass rolling speed of R1 is 1.4m/s, the second-pass rolling speed of R1 is 1.6m/s, the third-pass rolling speed of R1 is 2.6m/s, the first-pass rolling speed of R2 is 2.4m/s, the second-pass rolling speed of R2 is 5.0m/s, and the third-pass rolling speed of R2 is 3.6-5.0 m/s.
The outlet temperature of the rough rolling is controlled to be 1080 +/-20 ℃, and the outlet temperature of the finish rolling is controlled to be 850 +/-20 ℃.
The coiling temperature is 640 +/-20 ℃.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention, but the present invention is not limited thereto.
The invention provides a production process of an ultrathin hot-rolled checkered plate with the thickness of less than 1mm, which comprises the following steps of:
and S1, determining a production planning and arrangement mode, rolling with the thickness specification of 4.5mm, and organizing and producing according to the quantity in the table 1.
TABLE 1 Rolling plan for producing 0.8mm checkered plates
S2, heating the plate blank with the thickness of 230mm in a heating furnace, wherein the heating temperature is 1280 +/-20 ℃, the heating time is 180-200 min, and the tapping temperature is 1250 +/-20 ℃.
And S3, enabling the discharged plate blank to enter a rough rolling area, wherein the rough rolling area is provided with two rolling mills R1 and R2, each rolling mill rolls three passes, and the rough rolling speed adopts high-speed rolling for the heat preservation effect. The first-pass rolling speed of R1 is 1.4m/s, the second-pass rolling speed of R1 is 1.6m/s, the third-pass rolling speed of R1 is 2.6m/s, the first-pass rolling speed of R2 is 2.4m/s, the second-pass rolling speed of R2 is 5.0m/s, and the third-pass rolling speed of R2 is 3.6-5.0 m/s. The rough rolling outlet temperature adopts high-temperature rolling, and the temperature is controlled to be 1080 +/-20 ℃.
S4, after the rough rolling process, the steel wire enters a hot coil box for intermediate heat preservation, the threading speed of the hot coil box is 3.9m/S, and the coiling speed is 4.5 m/S. The hot coiled slab enters a finish rolling area, the finish rolling area is provided with 7 rolling mills, the front 6 rolling mills use smooth rolls, and the 7 th rolling mill uses a checkered roll. And the rolling reduction of the last rolling mill F7 frame in the finish rolling area is 15-18%, so that the pattern height is ensured. And the rolling reduction of other rolling mills is distributed according to the capacity of the rolling mill. The outlet temperature of the finish rolling is controlled to be 850 +/-20 ℃.
S5, cooling the finish rolled strip steel through a laminar cooling area, and cooling the strip steel to 640 +/-20 ℃. And (4) cooling the laminar cooling area by adopting a head-yielding mode, namely, not watering the laminar cooling area 20 meters away from the head of the strip steel. In order to ensure that the ultrathin strip steel is not stacked on a layer cooling roller way to form a sleeve, a medium-pressure water belt steel head sweeping device is arranged on the layer cooling roller way, and the function is put into use in the production process, and the specific use method comprises the following steps: and a high-pressure water spray head is arranged on one side of the roller way, and at the moment of sweeping the flat head of the strip steel by the flat head sweeping device, the high-pressure water spray head is started to sweep the flat head of the strip steel in the forward direction to press down the head of the strip steel.
And S6, coiling the cooled strip steel into a coil, wherein the coiling temperature is 640 +/-20 ℃, and the laminar cooling mode adopts a sparse cooling mode to prevent the buckling phenomenon caused by the too fast cooling speed of the strip steel.
Two recoiling machines are arranged in a coiling area, and in order to reduce the influence of the strip steel tail-flicking problem on production, a preferential coiling mode of the latter recoiling machine is adopted. In order to solve the problem that the ultrathin checkered plate flies up at the valve of the former coiler during the production of the conventional rolling mill, the valve of the former coiler is properly heightened and is lifted up by 10 degrees.
Example (b):
manufacturing a Q235B checkered plate, wherein the discharging temperature of a plate blank is controlled at 1250 ℃, the outlet temperature of rough rolling is controlled at 1100 ℃, the outlet temperature of finish rolling is controlled at 850 ℃, and the coiling temperature is controlled at 640 ℃.4 rolls of 1.0mm x 1250mm and 6 rolls of 0.8mm x 1250mm Q235B checkered plates were obtained according to the production schedule. The obtained checkered plate has the following properties: the yield strength is more than or equal to 235MPa, the tensile strength is 370-500 MPa, and the elongation is more than or equal to 26%.
The invention provides a method for producing ultrathin checkered plates with the thickness of below 1.0mm by utilizing a conventional hot continuous rolling mill, which combines the special technology of laminar cooling, namely sparse cooling and head-yielding cooling and sweeping device, solves the problem that the conventional rolling mill is difficult to produce the checkered plates with thin specifications, and stably produces the checkered plates with the thickness of below 1.0mm in batches. The width of the production organization of the conventional rolling mill is combined, the width specification is diversified, the limitation of single width specification of the endless rolling mill is avoided, and the production practicability is realized.
Finally, it is noted that: the above-mentioned list is only the preferred embodiment of the present invention, and naturally those skilled in the art can make modifications and variations to the present invention, which should be considered as the protection scope of the present invention provided they are within the scope of the claims of the present invention and their equivalents.
Claims (6)
1. The production process of the ultrathin hot-rolled checkered plate with the thickness of less than 1mm is characterized by comprising the following steps of:
s1, heating the steel blank in a heating furnace at 1280 +/-20 ℃ for 180-200 min, wherein the discharging temperature of the plate blank is 1250 +/-20 ℃;
s2, discharging the plate blank out of the furnace, and then entering a rough rolling area, wherein the rough rolling area adopts two rolling mills R1 and R2, each rolling mill rolls three passes, and the rough rolling speed adopts high-speed rolling;
s3, after rough rolling, the steel wire enters a hot coil box for intermediate heat preservation, the threading speed of the hot coil box is 3.9m/S, the coiling speed is 4.5m/S, the hot coil box enters a finish rolling area after coming out, the finish rolling area is provided with 7 stands, the last stand rolling machine F7 is a pattern rolling machine, and the screw-down rate of the F7 stand is 15-18%;
s4, carrying out laminar cooling on the rolled strip steel, wherein the laminar cooling mode adopts a sparse cooling mode, and the head of the strip steel adopts a head-yielding cooling mode;
and S5, coiling the cooled strip steel into a coil.
2. The production process of the ultrathin hot-rolled checkered plate with the thickness of less than 1mm as claimed in claim 1, wherein the head is cooled, and the head of the strip steel is not poured with layer cold water; and a medium-pressure water belt steel head sweeping device is arranged in the laminar cooling area, and when the head is cooled, the belt head is instantly started to sweep horizontally in the forward direction through the strip steel head sweeping device, so that the strip steel head is pressed down.
3. A process for producing ultra-thin hot-rolled checkered plate with thickness less than 1mm as claimed in claim 1, wherein two winders are used in the winding area, and the shutter of the former winder is raised 10 ° upward in the preferential winding mode of the latter winder.
4. The process for producing ultra-thin hot-rolled checkered plate with thickness less than 1mm as claimed in claim 1, wherein the first-pass rolling speed of R1 is 1.4m/s, the second-pass rolling speed of R1 is 1.6m/s, the third-pass rolling speed of R1 is 2.6m/s, the first-pass rolling speed of R2 is 2.4m/s, the second-pass rolling speed of R2 is 5.0m/s, and the third-pass rolling speed of R2 is 3.6-5.0 m/s.
5. A process for producing an ultrathin hot-rolled checkered plate with the thickness of less than 1mm as claimed in claim 1, wherein the outlet temperature of rough rolling is controlled to be 1080 +/-20 ℃, and the outlet temperature of finish rolling is controlled to be 850 +/-20 ℃.
6. The process for producing ultra-thin hot-rolled checkered plate with thickness less than 1mm as claimed in claim 1, wherein the coiling temperature is 640 +/-20 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011611358.XA CN112692056A (en) | 2020-12-30 | 2020-12-30 | Production process of ultrathin hot-rolled checkered plate with thickness of less than 1mm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011611358.XA CN112692056A (en) | 2020-12-30 | 2020-12-30 | Production process of ultrathin hot-rolled checkered plate with thickness of less than 1mm |
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| Publication Number | Publication Date |
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| CN112692056A true CN112692056A (en) | 2021-04-23 |
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| CN202011611358.XA Pending CN112692056A (en) | 2020-12-30 | 2020-12-30 | Production process of ultrathin hot-rolled checkered plate with thickness of less than 1mm |
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| CN (1) | CN112692056A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113996665A (en) * | 2021-10-30 | 2022-02-01 | 日照钢铁控股集团有限公司 | Production process for rolling extreme thin-specification checkered plate by thin slab |
| CN115634931A (en) * | 2022-10-24 | 2023-01-24 | 西南铝业（集团）有限责任公司 | Rolling process of ultrathin and ultra-wide checkered plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113996665A (en) * | 2021-10-30 | 2022-02-01 | 日照钢铁控股集团有限公司 | Production process for rolling extreme thin-specification checkered plate by thin slab |
| CN113996665B (en) * | 2021-10-30 | 2023-04-11 | 日照钢铁控股集团有限公司 | Production process for rolling extreme thin-specification checkered plate by thin slab |
| CN115634931A (en) * | 2022-10-24 | 2023-01-24 | 西南铝业（集团）有限责任公司 | Rolling process of ultrathin and ultra-wide checkered plate |
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Application publication date: 20210423 |