CN110961465B - Method for controlling thickness of hot-rolled pickling base material iron scale - Google Patents
Method for controlling thickness of hot-rolled pickling base material iron scale Download PDFInfo
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- CN110961465B CN110961465B CN201911153941.8A CN201911153941A CN110961465B CN 110961465 B CN110961465 B CN 110961465B CN 201911153941 A CN201911153941 A CN 201911153941A CN 110961465 B CN110961465 B CN 110961465B
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- 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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
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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
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- 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
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- 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
- B21B45/004—Heating the product
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- 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
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- 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
- B21B45/04—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 de-scaling, e.g. by brushing
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/04—Thickness, gauge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
Abstract
The invention relates to a method for controlling the thickness of scale on a hot-rolled pickling base material, belonging to the technical field of metallurgy, and the method for controlling the thickness of the scale on the hot-rolled pickling base material comprises the working procedures of billet heating, primary descaling, hot rolling, laminar cooling and coiling; in the steel billet heating, the heating temperature is 1160-1240 ℃, and the heating time is less than or equal to 240 min; the hot rolling comprises rough rolling and finish rolling, the finish temperature of the last rolling of the rough rolling is 1000-1060 ℃, and the outlet temperature of the finish rolling is 860-900 ℃; the coiling temperature is 560-600 ℃; the thickness of the hot-rolled pickling base material iron scale can be controlled within 11 microns, the subsequent pickling effect is prevented from being influenced by overlarge thickness, and the iron scale is prevented from being pressed in the hot rolling process to cause product degradation.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for controlling the thickness of iron scale on a hot-rolled pickling base material.
Background
The hot-rolled pickling base material refers to a hot-rolled plate to be pickled, the hot-rolled plate (pickled plate) after pickling can replace part of a cold-rolled plate, and the hot-rolled pickling base material is mainly used for motorcycle bodies, compressor shells, passenger cars, part of car wheels, chassis and other structural parts, and the thickness of an iron oxide scale on the surface of the hot-rolled pickling base material needs to be controlled in order to ensure the surface quality of the pickled plate.
Disclosure of Invention
In view of the above problems, the present invention has been made to provide a method of controlling the thickness of scale in a hot-rolled pickled base material that overcomes or at least partially solves the above problems.
The embodiment of the invention provides a method for controlling the thickness of scale on a hot-rolled pickling base material, which comprises the working procedures of billet heating, primary descaling, hot rolling, laminar cooling and coiling;
in the steel billet heating, the heating temperature is 1160-1240 ℃, and the heating time is less than or equal to 240 min;
the hot rolling comprises rough rolling and finish rolling, the finish temperature of the last rolling of the rough rolling is 1000-1060 ℃, and the outlet temperature of the finish rolling is 860-900 ℃;
the coiling temperature is 560-600 ℃.
Further, in the heating of the steel billet, the residual oxygen value in the heating furnace is less than or equal to 6 percent; in the heating furnace, the air surplus coefficient of the second adding section and the soaking section is 0.65-1.05; SO in coal gas2The content is less than 200mg/m3。
Further, in the primary descaling, the running speed of the steel billet is less than or equal to 1.4 m/s; the primary descaling pressure is more than or equal to 18 MPa.
Further, in the hot rolling, the steel billets are loaded at the interval of 1800 and 2000mm, the rolling period is 15-55 coils, and the rolling number is not more than 40 coils.
Further, in the rough rolling, 3+3 or 1+5 passes are adopted for rolling, 4-6 passes of descaling are carried out in the rolling process, and the descaling pressure of 4-6 passes is more than or equal to 19 MPa.
Further, in the finish rolling, double-row descaling is adopted, and the pressure of the double-row descaling is more than or equal to 19 MPa.
Furthermore, the front three or four stand rollers of the finish rolling adopt grinding rollers with the roller surface roughness Ra of less than or equal to 0.6 mu m.
Furthermore, in the finish rolling, the anti-stripping water falling of the front three or four frames is started, the rolling lubrication of each frame is started, and the cooling water between the frames in the rolling mill is closed.
Further, the laminar cooling adopts front section centralized cooling, and 3-8 groups of collecting pipes and side water spraying are started.
Further, the thickness of the hot-rolled pickling base material is more than or equal to 1.6 mm.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the method for controlling the thickness of the hot-rolled pickling base material iron scale provided by the embodiment of the invention can control the thickness of the hot-rolled pickling base material iron scale within 11 microns, thereby avoiding the influence on the subsequent pickling effect due to overlarge thickness and avoiding the product degradation caused by the pressing-in of the iron scale in the hot rolling process.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a surface view of a hot-rolled pickled base material for controlling scale thickness according to example 1 of the present invention after acid washing.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In this embodiment, a method for controlling thickness of scale on a hot rolled pickled base material is provided, comprising: heating a steel billet, primary descaling, hot rolling, laminar cooling and coiling;
in the steel billet heating, the heating temperature is 1160-1240 ℃, and the heating time is less than or equal to 240 min;
the hot rolling comprises rough rolling and finish rolling, the finish temperature of the last rolling of the rough rolling is 1000-1060 ℃, and the outlet temperature of the finish rolling is 860-900 ℃;
the coiling temperature is 560-600 ℃.
By adopting the technical scheme, the generation of furnace-generated iron scales is reduced, the adhesion effect of the iron scales and the matrix is reduced, the primary and secondary iron scales are removed in a high-pressure water hammering mode while the generation of the iron scales at each stage is controlled, the generation rate of the tertiary iron scales is reduced, and the thickness of the finished iron scales is finally reduced.
In the embodiment, in the billet heating, the residual oxygen value in the heating furnace is less than or equal to 6 percent; in the heating furnace, the air surplus coefficient of the second adding section and the soaking section is 0.65-1.05; SO in coal gas2The content is less than 200mg/m3。
By adopting the technical scheme, the thickness and the viscosity of the furnace-generated iron oxide scale are reduced.
In the embodiment, in the primary descaling, the running speed of the steel billet is less than or equal to 1.4 m/s; the primary descaling pressure is more than or equal to 18 MPa.
In the embodiment, in the hot rolling, the steel billets are loaded at the interval of 1800-2000mm, the rolling period is 15-55 coils, and the rolling number is not more than 40 coils.
By adopting the technical scheme, the production scheduling quantity in the roll period is controlled so as to ensure that the working condition in the roll period is optimal.
In the embodiment, the rough rolling is performed by 3+3 or 1+5 passes, the descaling is performed for 4-6 passes in the rolling process, and the descaling pressure for 4-6 passes is more than or equal to 19 MPa.
By adopting the technical scheme, the surface temperature of the plate blank can be effectively reduced, the generation of the iron scale is slowed down, the sufficient descaling pressure is ensured, and the iron scale generated on the surface of the plate blank can be effectively removed.
In the embodiment, double-row descaling is adopted in the finish rolling, and the double-row descaling pressure is more than or equal to 19 MPa.
By adopting the technical scheme, the secondary iron oxide scale generated on the surface of the plate blank can be effectively removed.
In the embodiment, the roller of the first three or four frames of finish rolling adopts a grinding roller with the roller surface roughness Ra of less than or equal to 0.6 mu m.
By adopting the technical scheme, the purpose is that the oxide film on the surface of the roller does not peel off in the rolling process of the acid-washing plate to cause large-thickness iron oxide scales.
In this embodiment, in the finish rolling, the peeling prevention water falling of the first three or four stands is turned on, the rolling lubrication of each stand is turned on, and the cooling water between stands in the rolling mill is turned off.
By adopting the technical scheme, the phenomenon that the oxide film is peeled off at the high-temperature section of the strip steel by the roller, so that the oxide film is pressed into the strip steel to form the iron scale is avoided.
In the embodiment, the laminar cooling adopts front-section centralized cooling, and 3-8 groups of collecting pipes and side water spraying are started.
By adopting the technical scheme, the front section is adopted for centralized cooling, and the generation of tertiary iron oxide scales is slowed down.
In the embodiment, the thickness of the hot-rolled pickling base material is more than or equal to 1.6 mm.
The method for controlling the thickness of scale on the hot-rolled pickled base material according to the present invention will be described in detail with reference to the following specific examples.
Example 1
The method for controlling the thickness of the scale of the hot-rolled pickling base material comprises the steps of billet heating, primary descaling, hot rolling, laminar cooling and coiling;
in the billet heating, the heating temperature is 1200 ℃, and the heating time is 210 min;
the hot rolling comprises rough rolling and finish rolling, wherein the finish temperature of the last rolling of the rough rolling is 1040 ℃, and the outlet temperature of the finish rolling is 880 ℃;
the coiling temperature was 580 ℃.
Specifically, in the heating of the steel billet, the residual oxygen value in the heating furnace is 2.9 percent; in the heating furnace, the air excess coefficient of the second addition section and the soaking section is 0.85; SO in coal gas2The content is less than 60mg/m3。
Specifically, in the primary descaling, the running speed of the steel billet is 1.0 m/s; the primary descaling pressure is 18.7 MPa.
Specifically, in the hot rolling, the steel billet is loaded at the interval of 1800-2000mm, the rolling period is 16-50 coils, and the rolling quantity is 35 coils.
Specifically, in the rough rolling, 3+3 passes are adopted for rolling, in the rolling process, 5 passes of descaling are carried out, and the descaling pressure of 55 passes is 20 MPa.
Specifically, in the finish rolling, double-row descaling is adopted, and the double-row descaling pressure is 19.5 MPa.
Specifically, the front three or four stand rollers of the finish rolling adopt grinding rollers with the roller surface roughness Ra of less than or equal to 0.6 mu m.
Specifically, in the finish rolling, the anti-stripping water falling of the front three or four stands is started, the rolling lubrication of each stand is started, and cooling water between stands in the rolling mill is stopped.
Specifically, the laminar cooling adopts front section centralized cooling, and 6 groups of collecting pipes and side water spraying are started.
Specifically, the thickness of the hot-rolled pickling base material is 3 mm.
Example 2
The method for controlling the thickness of the scale of the hot-rolled pickling base material comprises the steps of billet heating, primary descaling, hot rolling, laminar cooling and coiling;
in the process of heating the steel billet, the heating temperature is 1230 ℃, and the heating time is 206 min;
the hot rolling comprises rough rolling and finish rolling, wherein the finish temperature of the last rolling of the rough rolling is 1000 ℃, and the outlet temperature of the finish rolling is 860 ℃;
the coiling temperature was 560 ℃.
Specifically, in the heating of the steel billet, the residual oxygen value in the heating furnace is less than or equal to 6 percent; in the heating furnace, the air excess coefficient of the second addition section and the soaking section is 0.65; SO in coal gas2The content is 189mg/m3。
Specifically, in the primary descaling, the running speed of the steel billet is 1.4 m/s; the primary descaling pressure is 18 MPa.
Specifically, in the hot rolling, the steel billets are loaded at the interval of 1800-2000mm, the rolling period is 15-49 coils, and the rolling quantity is 35 coils.
Specifically, in the rough rolling, 3+3 or 1+5 passes are adopted for rolling, in the rolling process, 4 passes of descaling are carried out, and the 4 passes of descaling pressure is 20.2 MPa.
Specifically, in the finish rolling, double-row descaling is adopted, and the double-row descaling pressure is 19 MPa.
Specifically, the front three or four stand rolls of the finish rolling adopt a grinding roll with the surface roughness Ra of 0.5 mu m.
Specifically, in the finish rolling, the anti-stripping water falling of the front three or four stands is started, the rolling lubrication of each stand is started, and cooling water between stands in the rolling mill is stopped.
Specifically, the laminar cooling adopts front section centralized cooling, and 3 groups of collecting pipes and side water spraying are started.
Specifically, the thickness of the hot-rolled pickling base material is 1.6 mm.
Example 3
The method for controlling the thickness of the scale of the hot-rolled pickling base material comprises the steps of billet heating, primary descaling, hot rolling, laminar cooling and coiling;
in the process of heating the steel billet, the heating temperature is 1180 ℃, and the heating time is 195 min;
the hot rolling comprises rough rolling and finish rolling, wherein the finishing temperature of the last rolling of the rough rolling is 1040 ℃, and the outlet temperature of the finish rolling is 900 ℃;
the coiling temperature was 600 ℃.
Specifically, in the billet heating, the residual oxygen value in the heating furnace is 6%; in the heating furnace, the air excess coefficient of the second addition section and the soaking section is 1.05; SO in coal gas2The content is 190mg/m3。
Specifically, in the primary descaling, the running speed of the steel billet is 1.4 m/s; the primary descaling pressure is 19 MPa.
Specifically, in the hot rolling, the steel billets are loaded at the interval of 1800-2000mm, the rolling period is 15-55 coils, and the rolling number is 40 coils.
Specifically, in the rough rolling, 3+3 or 1+5 passes are adopted for rolling, in the rolling process, 4-6 passes of descaling are carried out, and the descaling pressure of 4-6 passes is 19.5 MPa.
Specifically, in the finish rolling, double-row descaling is adopted, and the pressure of the double-row descaling is 20.1 MPa.
Specifically, the front three or four stand rolls of the finish rolling adopt a grinding roll with the surface roughness Ra of 0.6 mu m.
Specifically, in the finish rolling, the anti-stripping water falling of the front three or four stands is started, the rolling lubrication of each stand is started, and cooling water between stands in the rolling mill is stopped.
Specifically, the laminar cooling adopts front section centralized cooling, and 8 groups of collecting pipes and side water spraying are started.
Specifically, the thickness of the hot-rolled pickling base material is 3.53 mm.
Experimental example 1
The pickled plates obtained by pickling the hot-rolled pickled base materials obtained in examples 1 to 3 were subjected to surface quality measurement, and the measurement results are shown in table 1.
TABLE 1
| Thickness of | Thickness of iron scale | |
| Example 1 | 3.0 | 10.99μm |
| Example 2 | 1.6 | 10.55μm |
| Example 3 | 3.5 | 8.35μm |
As shown in FIG. 1, the hot-rolled pickled plate obtained by pickling the pickled base material in example 1 has a smooth surface without scale pressing.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. A method for controlling the thickness of hot-rolled pickling base material scale is characterized in that the thickness of the hot-rolled pickling base material scale is more than or equal to 1.6mm, the method can control the thickness of the hot-rolled pickling base material scale within 11 mu m, and the method comprises the working procedures of billet heating, primary descaling, hot rolling, laminar cooling and coiling;
in the steel billet heating, the heating temperature is 1160-1240 ℃, the heating time is less than or equal to 240min, and the residual oxygen value in the heating furnace is less than or equal to 6 percent; in the heating furnace, the air surplus coefficient of the second adding section and the soaking section is 0.65-1.05; SO in coal gas2The content is less than 200mg/m3；
The hot rolling comprises rough rolling and finish rolling, the finish temperature of the last rolling of the rough rolling is 1000-;
the laminar cooling adopts front section centralized cooling, and 3-8 groups of collecting pipes and side water spraying are started;
the coiling temperature is 560-600 ℃.
2. The method of claim 1, wherein the billet run speed is less than or equal to 1.4m/s during the primary descaling; the primary descaling pressure is more than or equal to 18 MPa.
3. The method as claimed in claim 1, wherein the hot rolling is carried out by loading the slabs at intervals of 1800-2000mm, with a rolling period of 15-55 rolls, and the number of rolls is not more than 40 rolls.
4. The method for controlling the thickness of the scale of the hot-rolled pickling base material according to claim 1, wherein 3+3 or 1+5 passes of rolling are adopted in the rough rolling, 4-6 passes of descaling are carried out in the rolling process, and the descaling pressure of 4-6 passes is more than or equal to 19 MPa.
5. The method for controlling the thickness of the scale of the hot-rolled pickling base material according to claim 1, wherein double-row descaling is adopted in the finish rolling, and the pressure of the double-row descaling is more than or equal to 19 MPa.
6. The method for controlling the thickness of hot rolled pickled base scale according to claim 1, wherein in the finish rolling, the anti-strip falling water of the first three or four stands is turned on, the rolling lubrication of each stand is turned on, and the inter-stand cooling water in the rolling mill is turned off.
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| CN111872141B (en) * | 2020-08-12 | 2021-12-14 | 宝武集团鄂城钢铁有限公司 | Method for improving descaling quality of nickel-containing steel plate |
| CN112676341A (en) * | 2020-12-03 | 2021-04-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolling method of low-carbon steel |
| CN113290047A (en) * | 2021-05-21 | 2021-08-24 | 新余钢铁股份有限公司 | Processing method of low-carbon acid-washing steel substrate |
| CN115044833B (en) * | 2022-06-13 | 2023-09-15 | 首钢集团有限公司 | High-surface-quality 65Mn cold-rolled sheet and manufacturing method thereof |
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