CN109465295B - Method for preventing edge cracking and strip breakage of hot continuous rolled steel plate in cold rolling - Google Patents
Method for preventing edge cracking and strip breakage of hot continuous rolled steel plate in cold rolling Download PDFInfo
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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
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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
- B21B1/28—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 cold-rolling, e.g. Steckel cold mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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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
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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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
- B21B37/58—Roll-force control; Roll-gap control
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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
- B21B45/04—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
- B21B45/08—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 hydraulically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0057—Coiling the rolled product
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Abstract
The invention discloses a method for preventing edge breakage of a hot continuous rolled steel plate in cold rolling, which comprises the following steps: smelting molten steel to obtain a plate blank, heating the plate blank, fixing the width of the plate blank by using a hot rolling width fixing machine, rough rolling the plate blank to obtain an intermediate blank, and finish rolling the intermediate blank to obtain a steel plate; cooling the steel plate after finish rolling in a laminar flow manner, then coiling to obtain a hot rolled coil, and cold rolling the uncoiled hot rolled coil, wherein the total cold rolling reduction rate is less than or equal to 50%; adjusting the hammerhead hole type angle of the hot rolling width fixing machine to 40-42 degrees; adjusting the thickness of the intermediate blank to 50-60 mm; starting descaling water between frames of a finish rolling section F1/F2, wherein the water pressure is 8-12 MPa; closing the water spray at the side of the finish rolling section; and starting cooling water between racks of the finish rolling section F3/F4. The laminar cooling front section adopts a medium-pressure ultra-fast cooling process, and the back section adopts air cooling. The invention can easily solve the defect of strip breakage caused by DP980 cold rolling edge crack without influencing the production condition and the performance of finished products, and improves the yield of the strip steel.
Description
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to a method for preventing edge breakage of a hot continuous rolled steel plate in cold rolling.
Background
The higher requirements of weight reduction, energy conservation and high safety of the automobile enable the application of advanced high-strength steel on the automobile to be increased year by year, and the strength of 780MPa grade and below is widely applied to covering parts, structural parts, reinforcing parts and the like of the automobile. With the progress of automobile manufacturing technology, 980MPa grade and above cold-rolled dual-phase steel is gradually applied, and in the process of producing 980MPa grade high-strength steel in a certain first steel cold rolling plant, strip breakage accidents caused by edge cracking are generated by multiple times of cold rolling processes, and the strip breakage influences the production stability and rhythm of a cold rolling production line, so that the problem needs to be solved urgently.
The high-strength-level enterprises are not many in domestic batch stable industrial production, the edge crack defect basically exists when the cold continuous rolling unit of the mainstream steel mill produces the steel grade at present, the edge crack appearance is shown in figure 1, on one hand, the intermediate process is adopted for edge cutting after the edge crack occurs, the loss of the edge cutting shear is serious, and the yield is reduced; on the other hand, although the edge cracking of the subsequent cold rolling is reduced by adding an edge heating device in a hot rolling plant in part of steel mills, the energy consumption is too high, and the energy waste is caused, so that the synergistic attack from the aspects of hot rolling and cold rolling from the technical process point is urgently needed, and the edge cracking defect generated in the cold rolling process is solved.
Disclosure of Invention
In order to solve the above-mentioned defects, the main object of the present invention is to provide a method for preventing edge cracking of hot continuous rolled steel sheet during cold rolling, which can solve the cold rolling edge cracking defect of DP980 steel produced by hot continuous rolling with low cost, simplicity and high efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for preventing edge cracking and strip breakage of a hot continuous rolled steel plate in cold rolling comprises the following steps:
smelting molten steel to obtain a plate blank, heating the plate blank, fixing the width of the plate blank by using a hot rolling width fixing machine, rough rolling the plate blank to obtain an intermediate blank, and finish rolling the intermediate blank to obtain a steel plate; cooling the steel plate after finish rolling in a laminar flow manner, then coiling to obtain a hot rolled coil, and cold rolling the uncoiled hot rolled coil, wherein the total cold rolling reduction rate is less than or equal to 50%;
adjusting the hammerhead hole type angle of the hot rolling width determining machine to 40-42 degrees; adjusting the thickness of the intermediate blank to 50-60 mm;
starting descaling water between frames of a finish rolling section F1/F2, wherein the water pressure is 8-12 MPa; closing the water spray at the side of the finish rolling section; and starting cooling water between racks of the finish rolling section F3/F4.
The laminar cooling front section adopts a medium-pressure ultra-fast cooling process, and the back section adopts air cooling.
More preferably, the steel sheet is DP980 high-strength steel.
Preferably, the descaling water in the finish rolling section F1/F2 between racks is started, and the water pressure is 10 MPa; and (3) starting cooling water between the frames of the finish rolling section F3/F4, wherein the water content is 30-40%. The water quantity is based on the hourly water quantity of each rack, for example 360m3And h, the steel mills are slightly different.
As a further preferred option, the medium-pressure ultrafast cooling process specifically comprises: the upper and lower pole tubes are opened simultaneously, and the pressure is 0.3-0.5 MPa.
Further preferably, the pressures are all 0.4MPa
More preferably, the coiling temperature is 550-650 ℃.
More preferably, the coiling temperature is 600 ± 20 ℃.
More preferably, the edge temperature of the steel sheet is decreased to ± 20 ℃ after the laminar cooling is completed.
More preferably, the plate shape IU value is less than or equal to 20I during the cold rolling.
The invention has the beneficial effects that: the invention reduces the temperature drop of the edge part of the intermediate billet by optimizing the hammerhead hole pattern of the hot rolling width determining machine and adjusting the thickness of the intermediate billet; and simultaneously, descaling water between racks at the finish rolling section, cooling water between racks and side water spraying are optimized, and the temperature drop of the edge part of a hot rolled plate at the cold section of the laminar cooling front section is reduced by adopting a medium-pressure ultra-fast cooling process and a rear section air cooling lightening layer. By controlling the key points, the shape and the volume fraction of martensite at the hot rolling edge are optimized, and the cold rolling process is improved, so that the problem of cold rolling edge cracking caused by poor texture characteristics and plate shapes at the hot rolling edge, excessive deformation under cold rolling reduction and the like is solved.
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.
FIG. 1 is a schematic view of a cold-rolled edge crack edge of a conventional DP980 steel grade.
FIG. 2a is a schematic representation of the hot rolled metallographic structure (5 mm from the edge) of a conventional DP980 steel.
FIG. 2b is a schematic representation of the hot rolled metallographic structure of a conventional DP980 steel grade (20 mm from the edge).
FIG. 3a is a hot rolled SEM topography (strip 5mm from the edge) of a prior DP980 steel.
FIG. 3b is a hot rolled SEM topography (20 mm from the edge) of a prior DP980 steel grade.
FIG. 4 is a schematic diagram of the dislocation product of hot-rolled ferrite and martensite interface of the existing DP980 steel.
FIG. 5 is a schematic representation of the cold rolled edge crack microstructure of a prior DP980 steel grade.
FIG. 6a is a schematic diagram of the slab width temperature distribution (intermediate slab and layer cold end temperature) of a conventional DP980 steel grade.
FIG. 6b is a schematic diagram of the slab width temperature distribution (intermediate slab and layer cold end temperature) of the DP980 steel grade of the example of the invention.
FIG. 7a is a hot rolled SEM topography of example DP980 steel of the present invention (no strip 5mm from the edge).
FIG. 7b is a hot rolled SEM topography (20 mm from the edge) of example DP980 steel of the present invention.
FIG. 8 is a plate type control diagram of DP980 steel according to an embodiment of the present invention.
Detailed Description
The present invention is described in further detail below with reference to specific embodiments, which are given for the purpose of illustration only and are not intended to limit the scope of the invention.
The method firstly adopts a microscopic means to analyze the edge crack forming mechanism, and specifically comprises the following steps:
the hot rolled edge part of the steel coil with edge crack is good in macroscopic observation, the cold rolled edge crack caused by the damage of the hot rolled edge part is eliminated, therefore, the analysis is carried out from the aspect of internal structure, the Lepera reagent is adopted for corrosion, and the structure which is 5mm close to the edge part (the depth of the cold rolled edge crack is less than or equal to 5mm) and 20mm away from the edge part is observed. The steel is ferrite + martensite and a small amount of bainite, the martensite is in a banded structure, the banded structure with 5mm at the edge is more serious, the martensite content is higher (the bright white is the martensite), and as shown in figure 2a, the banded structure with 20mm away from the edge is not obvious, as shown in figure 2 b. Further, as shown in fig. 3a, the trend of martensite elongation at the 5mm side can be seen more clearly as the side temperature drop starts after the slab exits from the heating furnace and accumulates in the finish rolling area, the side temperature drop decreases to the critical area of austenite transformation in the finish rolling end frame, pro-eutectoid ferrite is formed, after the finish rolling is completed, a large amount of distortion energy exists in the elongated pro-eutectoid ferrite grains, alloy elements such as C, Mn are further discharged to the grain boundary, the CCT curve of the steel grade shows that pearlite transformation is difficult to occur in continuous cooling, bainite transformation is less, and finally martensite structure is formed around the pro-eutectoid ferrite. At a large reduction ratio (60% reduction ratio before optimization) of the final cold rolling, martensite is deformed and cracked, meanwhile, the dislocation plugging on the elongated ferrite and martensite is easy to crack, the microstructure of the dislocation plugging is shown in FIG. 4, and the plugging exceeding the strength limit after the cold rolling can crack at the interphase. The martensite fracture morphology and phase interface cracking are shown in figure 5.
Next, the present application studies hot rolled sheet width texture uniformity and edge crack correspondence, specifically including:
measuring the temperature distribution of the width of the hot rolled plate by using a thermal imager, selecting position points of the intermediate billet and the layer cooled plate for measurement, wherein the temperature drop of the edge part can be obviously seen for both the intermediate billet and the layer cooled plate, the temperature drop of the edge part of the intermediate billet is between 50 and 60 ℃, as shown by a curve a in figure 6a, the temperature of the hot rolled edge part after the layer cooled plate is greater than the temperature drop of the middle part, as shown by a curve b in figure 6a, the temperatures of the two side parts are 480 ℃ and 510 ℃ respectively, the temperature of the middle part is about 610 ℃, and the temperature drop of the edge part is 130 ℃ of 100.
The process research finds that the temperature drop of the edge of the intermediate billet can be reduced by optimizing the hammerhead hole pattern of the hot rolling width fixing machine and adjusting the thickness of the intermediate billet. The method specifically comprises the following steps: the hammerhead hole pattern angle is adjusted to 40-42 degrees, and the thickness of the intermediate blank is increased to 50-60 mm. And simultaneously, the descaling water between racks, the cooling water between racks and the side water spray of the finish rolling section are optimized. The method specifically comprises the following steps: normally starting F1/F2 frame room to remove scale water, wherein the water pressure is 8-12 MPa; the side water spray is closed, and F3/F4 inter-rack cooling water is opened. The front stage of the layer cooling adopts a medium-pressure ultra-fast cooling process and the rear stage of the layer cooling adopts air cooling, so that the temperature drop of the edge part of a hot rolled plate at the layer cooling stage is reduced.
Specifically, the ultra-fast cooling process specifically comprises the following steps: the upper polar tube and the lower polar tube are opened simultaneously, the pressure is 0.3-0.5MPa, and the temperature drop of the hot coil can be effectively reduced. Finally, after the layer cooling is finished, the temperature drop of the edge part is controlled within +/-20 ℃, and the coiling temperature range is 550-650 ℃. As shown by the modified curves c, d in fig. 6 b. The structures of the improved posterior edge part and the near edge part tend to be consistent, and the size of martensite becomes finer and more uniform. As shown in fig. 7a-7 b.
Further, this application has studied the influence of cold rolling technology to the edge crack, specifically includes:
in actual production, the larger the cold rolling reduction, the thinner the thickness of the finished product and the more cracks. Therefore, the thickness of the incoming hot rolled material is reduced, the fluctuation of the rolling force due to the defect of the plate shape is reduced by the cold rolling and the edge loosening, and the IU value of the plate shape is controlled within 20I, as shown in FIG. 8. Meanwhile, the reduction rate is reduced to be below 50%, edge cracking can be effectively controlled, and the improved appearance is shown in FIGS. 7a-7 b.
Accordingly, embodiments of the present invention provide a method for preventing a DP980 cold-rolled edge breakage strip through process adjustment during hot and cold rolling. On the premise of not increasing energy consumption and ensuring smooth and stable production, the hot-rolled edge structure is optimized, and meanwhile, the cold-rolled rolling chaplet is optimized, so that reference is provided for improving the actual production process of the cold-rolled strip steel and the method is used for reference. The method is simple and has obvious effect.
The following provides an explanation of embodiments of the present invention.
The main components of the DP980 steel are shown in Table 1;
TABLE 1 DP980 main Components (% by mass)
The method for preventing the edge of the hot continuous rolled DP980 steel plate from being cracked and broken in the cold rolling comprises the following steps:
smelting molten steel to obtain a plate blank, heating the plate blank, fixing the width of the plate blank by using a hot rolling width fixing machine, rough rolling the plate blank to obtain an intermediate blank, and finish rolling the intermediate blank to obtain a steel plate; cooling the steel plate after finish rolling in a laminar flow manner, then coiling to obtain a hot rolled coil, and cold rolling the uncoiled hot rolled coil, wherein the total cold rolling reduction rate is less than or equal to 50%;
adjusting the hammerhead hole type angle of the hot rolling width determining machine to 40-42 degrees; adjusting the thickness of the intermediate blank to 50-60 mm;
starting descaling water between frames of a finish rolling section F1/F2, wherein the water pressure is 8-12 MPa; closing the water spray at the side of the finish rolling section; and (3) starting cooling water between the frames of the finish rolling section F3/F4, wherein the water content is 30-40%.
The laminar cooling front section adopts a medium-pressure ultra-fast cooling process, and the back section adopts air cooling. The medium-pressure ultrafast cooling process specifically comprises the following steps: the upper and lower pole tubes are opened simultaneously, and the pressure is 0.3-0.5 MPa.
After the laminar cooling of the above examples is completed, the edge temperature of the steel plate is decreased to ± 20 ℃. During the cold rolling, the rolling force fluctuation caused by poor plate shape is reduced by cold rolling loose edge rolling, and the plate shape IU value is less than or equal to 20I.
Table 2 shows the specific control process parameters and edge crack conditions in the methods of the examples.
TABLE 2
While the preferred embodiments of the present application 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 alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (9)
1. A method for preventing the edge of a hot continuous rolling steel plate from cracking and breaking a strip in cold rolling is characterized in that: the method comprises the following steps:
smelting molten steel to obtain a plate blank, heating the plate blank, fixing the width of the plate blank by using a hot rolling width fixing machine, rough rolling the plate blank to obtain an intermediate blank, and finish rolling the intermediate blank to obtain a steel plate; cooling the steel plate after finish rolling in a laminar flow manner, then coiling to obtain a hot rolled coil, and cold rolling the uncoiled hot rolled coil, wherein the total cold rolling reduction rate is less than or equal to 50%;
adjusting the hammerhead hole type angle of the hot rolling width determining machine to 40-42 degrees; adjusting the thickness of the intermediate blank to 50-60 mm;
starting descaling water between frames of a finish rolling section F1/F2, wherein the water pressure is 8-12 MPa; closing the water spray at the side of the finish rolling section; starting cooling water between racks of a finish rolling section F3/F4;
the laminar cooling front section adopts a medium-pressure ultra-fast cooling process, and the back section adopts air cooling.
2. The method for preventing edge breakage of a hot continuous rolled steel sheet in cold rolling according to claim 1, wherein: the steel plate is DP980 high-strength steel.
3. The method for preventing edge breakage of a hot continuous rolled steel sheet in cold rolling according to claim 1, wherein: starting descaling water between frames of a finish rolling section F1/F2, wherein the water pressure is 10 MPa; and (3) starting cooling water between the frames of the finish rolling section F3/F4, wherein the water content is 30-40%.
4. The method for preventing edge breakage of a hot continuous rolled steel sheet in cold rolling according to claim 1, wherein: the medium-pressure ultrafast cooling process specifically comprises the following steps: the upper and lower pole tubes are opened simultaneously, and the pressure is 0.3-0.5 MPa.
5. The method for preventing edge breakage of a hot continuous rolled steel sheet in cold rolling according to claim 4, wherein: the pressures are all 0.4 MPa.
6. The method for preventing edge breakage of a hot continuous rolled steel sheet in cold rolling according to claim 1, wherein: the coiling temperature is 550-650 ℃.
7. The method for preventing edge breakage of a hot continuous rolled steel sheet in cold rolling according to claim 6, wherein: the coiling temperature is 600 +/-20 ℃.
8. The method for preventing edge breakage of a hot continuous rolled steel sheet in cold rolling according to claim 1, wherein: and after the laminar cooling is finished, the temperature of the edge of the steel plate is reduced to +/-20 ℃.
9. The method for preventing edge breakage of a hot continuous rolled steel sheet in cold rolling according to claim 1, wherein: and when in cold rolling, the plate shape IU value is less than or equal to 20I.
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| CN104593698A (en) * | 2015-01-22 | 2015-05-06 | 首钢总公司 | Method for manufacturing high-strength cold-rolled weather resisting steel plates and high-strength cold-rolled weather resisting steel plates |
| CN106086638A (en) * | 2016-06-17 | 2016-11-09 | 首钢总公司 | A kind of Galvanized Dual Phase Steel and production method thereof |
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