CN115608790A - Method and equipment for preventing edge rib forming defect of cold-rolled strip steel - Google Patents
Method and equipment for preventing edge rib forming defect of cold-rolled strip steel Download PDFInfo
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- CN115608790A CN115608790A CN202211368451.1A CN202211368451A CN115608790A CN 115608790 A CN115608790 A CN 115608790A CN 202211368451 A CN202211368451 A CN 202211368451A CN 115608790 A CN115608790 A CN 115608790A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 124
- 239000010959 steel Substances 0.000 title claims abstract description 124
- 230000007547 defect Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005096 rolling process Methods 0.000 claims abstract description 168
- 238000005098 hot rolling Methods 0.000 claims abstract description 56
- 239000010960 cold rolled steel Substances 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims description 23
- 239000000498 cooling water Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000005299 abrasion Methods 0.000 description 14
- 238000005097 cold rolling Methods 0.000 description 13
- 238000005266 casting Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 238000013178 mathematical model Methods 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
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- 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
- B21B27/021—Rolls for sheets or strips
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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
Abstract
The embodiment of the invention provides a method and equipment for preventing the edge rib forming defect of cold-rolled strip steel, and relates to the field of strip steel hot rolling. Aims to solve the problem of ribbing at the edge of a cold-rolled steel strip. The method comprises the steps that the concavity range of the roller shape of a hot rolling rough rolling area is-290-300 mu m; the convexity range of the strip steel in the hot rolling and finish rolling area is 60-80 mu m, the wedge range of the strip steel is less than or equal to 20 mu m, the start rolling temperature of finish rolling is controlled at 1053-1100 ℃, and the finish rolling temperature of the finish rolling is controlled at 890-910 ℃; a second concave roller is adopted as a rack roller in the head area of the finish rolling area, and a third concave roller is adopted as a rack roller in the tail area of the finish rolling area; the concavity range of the second concave roller is-220 to-230 mu m; the concavity range of the third concave roller is-170 to-180 mu m. The apparatus is used to implement the above-described method. The stress of the contact part of the roller and the edge of the strip steel is reduced, the stress condition of the strip steel and the roller is reduced, the roller is ensured to be evenly worn, and the problem of ribbing is solved.
Description
Technical Field
The invention relates to the field of hot rolling of strip steel, in particular to a method and equipment for preventing edge rib forming defects of cold-rolled strip steel.
Background
After the hot rolled steel strip is cold rolled, a bulge along the length direction appears in the steel coil in the coiling process, which is commonly called as 'ribbing'. The 'ribbing' defect is a bulging phenomenon formed on the surface of a steel coil in the process of coiling the strip steel, and macroscopically shows that the cold-rolled coil bulges in a strip shape along the rolling direction, so that additional waves are generated in the uncoiling defect area of the strip steel, local instability is formed on the surface of the strip steel, the appearance quality and the service performance of the steel plate are obviously influenced, and the product is degraded or even scrapped. The cold rolling and rib forming phenomena are mainly caused by local high points of the hot rolled strip steel.
In the prior art, a cold-rolled ribbed steel coil is caused by local high points of the hot-rolled steel coil, and a common method is to predict a rolling loss profile curve of a finish rolling area by using a hot-rolling mathematical model, adjust the quantity of serial rollers to change the position of a roller, and realize the uniform abrasion of the roller by the mathematical model based on the transverse movement of the roller. The problem of rib formation caused by uneven hardness of the strip steel cannot be solved.
Disclosure of Invention
The object of the present invention includes, for example, providing a method for preventing the edge beading defect of a cold-rolled steel strip, which can improve the problem of the edge beading of the cold-rolled steel strip.
The object of the present invention is also to provide an apparatus for preventing the edge beading defect of a cold rolled steel strip, which can improve the problem of the edge beading of the cold rolled steel strip.
Embodiments of the invention may be implemented as follows:
the embodiment of the invention provides a method for preventing the edge rib defect of a cold-rolled steel strip, which comprises the following steps: the roll profile of the hot rolling rough rolling area adopts a first concave roll, and the concavity range of the first concave roll is-290 to-300 mu m; the convexity range of the strip steel in the hot rolling and finish rolling area is 60-80 mu m, the wedge range of the strip steel is less than or equal to 20 mu m, the finish rolling start temperature is controlled at 1053-1100 ℃, and the finish rolling temperature is controlled at 890-910 ℃; dividing a rack roller in a hot rolling finish rolling area into three areas, namely a head area rack roller, a middle area rack roller and a tail area rack roller; the head area rack roller adopts a second concave roller, and the tail area rack roller adopts a third concave roller; the concavity range of the second concave roller is-220 to-230 mu m; the concavity range of the third concave roller is-170 to-180 mu m; the concavity of the second concave roller is smaller than the concavity of the third concave roller;
the middle parts of the roll surfaces of the first concave roll, the second concave roll and the third concave roll are all concavely arranged on the two ends of the roll close to the roll shaft.
In addition, the method for preventing the edge beading defect of the cold-rolled steel strip provided by the embodiment of the invention can also have the following additional technical characteristics:
optionally, the middle area frame roller adopts a fourth concave roller, and the concavity range of the fourth concave roller is-190 to-200 μm; the concavity of the fourth concave roller is greater than the concavity of the second concave roller, and the concavity of the fourth concave roller is less than the concavity of the third concave roller.
Optionally, the finish hot rolling zone comprises seven stand rolls, wherein the roll profiles of the first to third stand rolls employ the second concave roll; the fourth concave roller is adopted for the roller shapes from the fourth frame roller to the third frame roller; the roller profile of the seventh frame roller adopts the third concave roller.
Optionally, the heating temperature of the head of the strip steel is lower than the heating temperature of the tail of the strip steel, and the heating temperature difference range of the head of the strip steel and the tail of the strip steel is 30-60 ℃.
Optionally, in the hot rolling rough rolling area, the temperature difference between the head of the strip steel and the tail of the strip steel ranges from 20 ℃ to 50 ℃.
Optionally, in the hot rolling finish rolling area, the temperature difference between the head of the strip steel and the tail of the strip steel ranges from 10 ℃ to 30 ℃.
Optionally, the hot rolling rough rolling adopts six passes, the reduction rate range of the first pass and the last pass is 10-15%, and the reduction rate range of the middle pass is more than or equal to 25%.
Optionally, in a hot rolling finish rolling area, the cooling water amount of a roller is 60-63%, the water pressure is 1.0mpa, the cooling water temperature is 20-38 ℃, the slab rolling interval is not less than 150s, and the rolling speed is not more than 18m/s.
Optionally, in the hot rolling finish rolling area, the distance from a first rack roller to a third rack roller is more than 3mm; and the distance between the roller of the fourth frame and the roller of the seventh frame is more than 5mm.
The embodiment of the invention also provides equipment for preventing the edge beading defect of the cold-rolled strip steel. The device for preventing the edge beading defect of the cold-rolled steel strip comprises the first concave roller, the second concave roller and the third concave roller; the first concave roller is arranged in the hot rolling rough rolling area; the second concave roller is arranged on the head area rack of the hot rolling finish rolling area; the third concave roller is arranged on the tail area rack of the hot rolling finish rolling area.
The method and the equipment for preventing the edge beading defect of the cold-rolled strip steel have the beneficial effects that:
the method for preventing the edge rib forming defect of the cold-rolled steel strip comprises the following steps: the roll profile of the hot rolling rough rolling area adopts a first concave roll, and the concavity range of the first concave roll is-290 to-300 mu m; the convexity range of the strip steel in the hot rolling and finish rolling area is 60-80 mu m, the wedge range of the strip steel is less than or equal to 20 mu m, the start rolling temperature of finish rolling is controlled at 1053-1100 ℃, and the finish rolling temperature of the finish rolling is controlled at 890-910 ℃; dividing a rack roller in a hot rolling finish rolling area into three areas, namely a head area rack roller, a middle area rack roller and a tail area rack roller; the roll of the rack in the head area adopts a second concave roll, and the roll of the rack in the tail area adopts a third concave roll; the concavity range of the second concave roller is-220 to-230 mu m; the concavity range of the third concave roller is-170 to-180 mu m; the concavity of the second concave roller is smaller than that of the third concave roller; the middle parts of the roll surfaces of the first concave roll, the second concave roll and the third concave roll are uniformly arranged close to the roll shaft in a concave mode.
The roll shape concavity of the rolls in the hot rolling rough rolling area and the hot rolling finish rolling area is designed, and the convexity of the strip steel in the finish rolling area is controlled, so that the stress of the contact part of the rolls and the edge part of the strip steel is reduced, the stress condition of the strip steel and the rolls is reduced, the rolls are ensured to be uniformly worn, the hot rolling strip steel does not have local high points, and the product quality of the cold rolling strip steel is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a block diagram of the steps of a method for preventing the edge beading defect of a cold-rolled steel strip according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
The method for preventing the edge beading defect of the cold-rolled steel strip according to the present embodiment will be described in detail with reference to fig. 1.
Referring to fig. 1, an embodiment of the present invention provides a method for preventing edge beading defects of a cold-rolled steel strip, including: the roll profile of the hot rolling rough rolling area adopts a first concave roll, and the concavity range of the first concave roll is-290 to-300 mu m; the convexity range of the strip steel in the hot rolling and finish rolling area is 60-80 mu m, the wedge range of the strip steel is less than or equal to 20 mu m, the finish rolling start temperature is controlled at 1053-1100 ℃, and the finish rolling temperature is controlled at 890-910 ℃; dividing a rack roller in a hot rolling finish rolling area into three areas, namely a head area rack roller, a middle area rack roller and a tail area rack roller; the roll of the rack in the head area adopts a second concave roll, and the roll of the rack in the tail area adopts a third concave roll; the concavity range of the second concave roller is-220 to-230 mu m; the concavity range of the third concave roller is-170 to-180 mu m; the concavity of the second concave roller is smaller than that of the third concave roller; the middle parts of the roll surfaces of the first concave roll, the second concave roll and the third concave roll are all arranged in a concave mode relative to the two ends of the roll close to the roll shaft.
The strip steel is sequentially heated, hot rolled and cold rolled. The hot rolling includes rough rolling and finish rolling. Therefore, the strip is sequentially subjected to heating, hot rolling rough rolling, hot rolling finish rolling, and finally cold rolling.
It should be noted that: the concave roller is characterized in that the roller surface of the roller is an arc surface, and the vertical distance from the roller surface to the roller shaft is gradually increased along the direction from the middle part of the roller to the two ends of the roller, namely the diameter of the roller is gradually reduced along the direction from the two ends to the middle part. The 'concavity' refers to the fact that the roll surface of the roll is a cambered surface, the vertical distance from the roll surface to the roll shaft is gradually increased along the direction from the middle of the roll to the two ends of the roll, the concavity is the concave distance along the direction of the vertical roll shaft from the roll surface with the minimum vertical distance to the roll shaft to the roll surface with the maximum vertical distance to the roll shaft, and in fact, the concave distance from the middle of the roll to the two ends of the roll is also the concave distance, and is expressed in a negative number mode, and the smaller the concavity is, the larger the concave distance is. On the contrary, the convexity of the strip steel is that the strip steel has an upper surface and a lower surface, the strip steel is divided into a plurality of parts, when the distance between the upper surface and the lower surface of the first part is larger than the distance between the upper surface and the lower surface of the second part, the first part is raised relative to the second part, and the distance between the first part and the second part is a convex part. The wedge shape of the strip steel refers to the distance between the upper surface and the lower surface of the strip steel which is gradually reduced or gradually increased along the width direction, and the wedge shape of the strip steel is the difference of the distance between the upper surface and the lower surface at the two sides.
The concavity range of the first concave roller is-290 to-300 μm, and may be-290 μm, -292 μm, -295 μm, -298 μm, or-300 μm. The convexity of the strip steel ranges from 60 to 80 μm, and can be 60 μm, 65 μm, 70 μm, 75 μm and 80 μm. The finishing rolling temperature is controlled to be 1053-1100 ℃, which can be 1053 ℃, 1060 ℃, 1070 ℃, 1080 ℃, 1090 ℃ and 1100 ℃. The finishing temperature is controlled at 890-910 ℃, which can be 890 ℃, 900 ℃ and 910 ℃. The concavity range of the second concave roller is-220 to-230 μm, and can be-220 μm, -225 μm, and-230 μm. The concavity range of the third concave roller is-170 to-180 μm, and can be-170 μm, -175 μm, or-180 μm.
The roller shape of the rough rolling area adopts a concave roller with the diameter of-300 mu m; the convexity of the strip steel in the hot rolling and finish rolling area is controlled to be 60-80 mu m, the wedge shape is controlled to be less than or equal to 20 mu m, the finish rolling start temperature is 1053-1100 ℃, and the finish rolling temperature is controlled to be 890-910 ℃, so that the stress of the contact part of the roller and the edge part of the strip steel is reduced. The roll of the head area rack adopts a second concave roll, and the roll of the tail area rack adopts a third concave roll; the concavity range of the second concave roller is-220 to-230 mu m; the concavity range of the third concave roller is-170 to-180 mu m; the concavity of the second concave roller is smaller than that of the third concave roller " ， By designing the convexity of the roller, the stress condition of the strip steel and the roller is reduced, and the uniform abrasion of the roller is ensured. Thereby improving the problem of the edge beading of the cold-rolled steel strip.
In the embodiment, the middle area frame roller adopts a fourth concave roller, and the concavity range of the fourth concave roller is-190 to-200 mu m; the concavity of the fourth concave roller is greater than the concavity of the second concave roller, and the concavity of the fourth concave roller is less than the concavity of the third concave roller.
In this embodiment, the roll concavity of the frame in the head region is smaller than the roll concavity of the frame in the middle region, and the roll concavity of the frame in the middle region is smaller than the roll concavity of the frame in the tail region. Wherein, the roll concavity range of the frame in the head area is-220 to-230 μm, the roll concavity range of the frame in the tail area is-170 to-180 μm, and the roll concavity range of the frame in the middle area is-190 to-200 μm. The concavity range of the fourth concave roller is-190 to-200 μm, and can be-190 μm, -195 μm and-200 μm.
In the embodiment, the roll shape of the first frame roll adopts the concavity of-220 to-230 mu m, and the roll shape of the last frame roll adopts the concavity of-170 to-180 mu m. By designing the convexity of the roller, the stress condition of the strip steel and the roller is reduced, and the uniform abrasion of the roller is ensured.
In the embodiment, the hot rolling finish rolling area comprises seven frame rollers, wherein the roller shapes from the first frame roller to the third frame roller adopt a second concave roller; the roller shapes from the fourth frame roller to the third frame roller adopt a fourth concave roller; the roller profile of the seventh frame roller adopts a third concave roller.
Specifically, the roll shapes of the hot rolling finish rolling area, the first frame roll, the second frame roll and the third frame roll are concave-220 to-230 mu m. The roll shapes of the fourth frame roller, the fifth frame roller and the sixth frame roller adopt the concavity of-190 to-200 mu m. The roll shape of the seventh frame roll adopts the concavity of-170 to-180 mu m.
Specifically, the finish rolling area has 7 frames (F1-F7), the roller shapes of the first three frames (F1-F3) are-230 mu m, the roller shapes of the F4-F6 frames are-200 mu m, and the roller shapes of the last frame are-180 mu m.
In the embodiment, the heating temperature of the head of the strip steel is lower than the heating temperature of the tail of the strip steel, and the heating temperature difference range of the head of the strip steel and the tail of the strip steel is 30-60 ℃. The temperature difference range is 30-60 ℃, and can be 30 ℃, 40 ℃, 50 ℃ and 60 ℃.
Before rough rolling, the head-tail temperature difference of the strip steel is controlled, and the head-tail temperature difference is heated to 30-60 ℃. The tail temperature drop in the rolling process can be reduced by improving the tail temperature, so that the abrasion of the tail of the strip steel to a roller is reduced.
In the embodiment, in the hot rolling rough rolling area, the temperature difference range between the head of the strip steel and the tail of the strip steel is 20-50 ℃. Similarly, in order to reduce the temperature drop of the tail part in the rolling process, the abrasion of the tail part of the strip steel to the roller is reduced.
In this example, in the hot rolling finish rolling zone, the temperature difference between the head of the strip steel and the tail of the strip steel was in the range of 10 to 30 ℃. Similarly, in order to reduce the temperature drop of the tail part in the rolling process, the abrasion of the tail part of the strip steel to the roller is reduced.
In the embodiment, the hot rolling rough rolling adopts six passes, the reduction rate range of the first pass and the last pass is 10-15%, and the reduction rate range of the middle pass is more than or equal to 25%. The rough rolling adopts 6 passes, the reduction rate of the 1 st pass and the last pass is 10-15%, and the reduction rate of the middle pass is more than or equal to 25%. The pass adopts low reduction rate, and the stress of the roller is small, so that the good plate shape of the outlet plate blank is ensured, and the uniformity of the plate blank thickness is improved. The initial rolling and final rolling temperature of rough rolling is controlled according to the requirements of steel grades, and no special requirement exists.
In the embodiment, in a hot rolling finish rolling area, the cooling water quantity of a roller is 60-63%, the water pressure is 1.0mpa, the cooling water temperature is 20-38 ℃, the rolling interval of a plate blank is not less than 150s, and the rolling speed (the roller speed) is not more than 18m/s. Specifically, the cooling conditions are applied to all the stand rolls in the finish rolling zone. The amount of cooling water is 60% -63% ", and the amount of cooling water may be 60%, 61%, and 63%.
The roller is contacted with the strip steel at high temperature during rolling, the surface of the roller is oxidized under the influence of high temperature, an oxide film can be formed more quickly through the control, the wear resistance is improved, and the abrasion of the roller is reduced. When the position with large local wear of the roller is contacted with the strip steel, the thickness of the corresponding strip steel at the position is large, the thickness can not be completely eliminated during cold rolling, the thick position is continuously superposed in the coiling process, the strip steel bulge phenomenon is caused, and the bad plate shape is generated in the subsequent uncoiling process. Therefore, "wear resistance is improved, roll wear is reduced", and the defect of beading can be reduced.
In the embodiment, in the hot rolling finish rolling area, the distance between a first rack roller and a third rack roller is more than 3mm; and the distance between the roller of the fourth frame and the roller of the seventh frame is more than 5mm.
Specifically, the "tandem distance" means that the rolling rolls include an upper rolling roll and a lower rolling roll, a channel for rolling the strip steel is formed between the upper rolling roll and the lower rolling roll, and the total of the distances of the upper rolling roll and the lower rolling roll which are staggered in the axial direction is the tandem distance. The roller position is changed by adjusting the roller string quantity, so that the abrasion position of the roller and the contact position of the strip steel are changed, and the local high points of the strip steel are reduced.
In the embodiment, the rolling quantity of the hot rolling rough rolling area, the hot rolling finish rolling area and the cold rolling area in the same width specification of the plate blank is less than or equal to 40. The contact position of the edge of the same-specification plate blank and the roller is basically unchanged, so that the edge of the roller is greatly abraded under the long-time abrasion condition, the thickness of the edge of the strip steel is too large, the condition that the thickness of the edge is too large cannot be completely eliminated by subsequent cold rolling, and the edge rib forming phenomenon is caused. Therefore, if the number of the blocks exceeds 40, the roll is replaced, and the wear of the roll can be prevented from causing ribbing.
According to the method for preventing the edge beading defect of the cold-rolled steel strip provided by the embodiment, the working principle of the method for preventing the edge beading defect of the cold-rolled steel strip is as follows: through the process, the convexity of the roller and the plan control, the hot rolled strip steel does not have local high points, namely the phenomenon of overlarge local thickness, and the product quality is improved. The steel type or grade suitable for cold rolling products is SPHC steel, SPHD steel, SPHE steel, IF steel, XJD2 steel, non-oriented silicon steel and the like.
Example 1
And (3) rolling planning: the specification of the steel grade SPHC steel is 2.5 multiplied by 1250mm.
Heating control: the size of the casting blank is 230 multiplied by 1080mm, the total time of the furnace is 150min, the heating time of the second heating is 40min, the soaking period time is 45min, the discharging temperature is 1240 ℃, and the temperature difference between the head and the tail is 45 ℃.
Rough rolling control: the roller profile of the roller adopts a concave roller with the diameter of-300 mu m, the roller is subjected to rough rolling for 6 times, and the outlet temperature of the rough rolling is 1086 ℃; the thickness of the rough rolled plate blank is as follows: 36mm, and the temperature difference of the rough rolling area of the strip steel is 38 ℃.
Rolling pass reduction
| Rack | Pass 1 | Pass 2 | Pass 3 | Pass 4 | Pass 5 | Pass 6 |
| Inlet thickness | 230 | 198 | 149 | 94 | 58 | 42 |
| Outlet thickness | 198 | 149 | 94 | 58 | 42 | 36 |
| Reduction rate/%) | 13.9 | 24.7 | 36.9 | 38.3 | 27.6 | 14.2 |
Finish rolling control:
the initial rolling temperature of the finish rolling is 1065 ℃, and the outlet temperature of the finish rolling is 890 ℃. The temperature difference between the head and the tail of the strip steel in a finish rolling area requires 22 ℃.
The cooling water quantity of the F1-F7 roller is 60%, the water pressure is 1.0mpa, and the cooling water temperature is 35 ℃.
The roll type of F1-F3 is-230 μm, the roll type of F4-F6 is-200 μm, and the roll type of the last roll type is-180 μm.
The slab rolling interval was 160s, and the rolling speed (roll speed) was 14m/s.
Each plate blank string roller of the F1-F3 rack is 5mm in finish rolling, and each plate blank string roller of the F4-F7 rack is 8mm in finish rolling.
The convexity of the strip steel is controlled to be 70 mu m, and the wedge shape is controlled to be 20 mu m.
The coiling temperature was controlled to 680 ℃.
The effects are as follows: no rib phenomenon after cold rolling.
Example 2
And (3) rolling planning: the specification of the steel grade SPHE steel is 2.75 multiplied by 1250mm.
Heating control: the size of a casting blank is 230 multiplied by 1270mm, the total time of the furnace is 161min, the heating time of the second heating is 42min, the soaking period time is 46min, the discharging temperature is 1239 ℃, and the head-tail temperature difference is 48 ℃.
Rough rolling control: the roller profile of the roller adopts a concave roller with the diameter of-300 mu m, the roller is subjected to rough rolling for 6 times, and the outlet temperature of the rough rolling is 1083 ℃; the thickness of the rough rolled plate blank is as follows: 36mm, and the temperature difference of the rough rolling area of the strip steel is 36 ℃.
Rolling pass reduction
| Frame | Pass 1 | Pass 2 | Pass 3 | Pass 4 | Pass 5 | Pass 6 |
| Inlet thickness | 230 | 199 | 149 | 94 | 58 | 41 |
| Outlet thickness | 199 | 149 | 94 | 58 | 41 | 36 |
| Reduction rate/%) | 13.4 | 25.6 | 36.4 | 38.3 | 29.3 | 12.2 |
Finish rolling control:
the initial rolling temperature of the finish rolling is 1060 ℃, and the outlet temperature of the finish rolling is 892 ℃. The temperature difference between the head and the tail of the strip steel in a finish rolling area is required to be 24 ℃.
The cooling water quantity of the F1-F7 roller is 61 percent, the water pressure is 1.0mpa, and the cooling water temperature is 33 ℃.
The roll type of F1-F3 is-230 μm, the roll type of F4-F6 is-200 μm, and the roll type of the last roll type is-180 μm.
The slab rolling interval was 168s and the rolling speed was 17m/s.
The roller quantity of each plate blank of a finish rolling F1 machine frame is 3mm, the roller quantity of an F2 machine frame is 5mm, the roller quantity of an F3 machine frame is 4mm, the roller quantity of each plate blank of an F4 machine frame is 6mm, the roller quantity of an F5 machine frame is 7mm, the roller quantity of an F6 machine frame is 7mm, and the roller quantity of an F7 machine frame is 10mm.
The convexity of the strip steel is controlled to be 68 mu m, and the wedge shape is controlled to be 19 mu m.
The coiling temperature was controlled at 709 ℃.
The effects are as follows: no rib phenomenon after cold rolling.
Example 3
And (3) rolling planning: the steel grade XJD2 steel has the product specification of 2.75 multiplied by 1371mm.
Heating control: the size of the casting blank is 230 multiplied by 1390mm, the total time of the furnace is 165min, the heating time of the second heating is 42min, the soaking period time is 46min, the discharging temperature is 1239 ℃, and the head-tail temperature difference is 48 ℃.
Rough rolling control: the roller profile of the roller adopts a concave roller with the diameter of-300 mu m, the roller is subjected to rough rolling for 6 times, and the outlet temperature of the rough rolling is 1083 ℃; the thickness of the rough rolled plate blank is as follows: 36mm, and the temperature difference of the rough rolling area of the strip steel is 39 ℃.
Rolling pass reduction
| Frame | Pass 1 | Pass 2 | Pass 3 | Pass 4 | Pass 5 | Pass 6 |
| Inlet thickness | 230 | 200 | 149 | 93 | 59 | 41 |
| Outlet thickness | 200 | 149 | 93 | 59 | 41 | 36 |
| Reduction rate/%) | 13.0 | 25.5 | 37.6 | 36.5 | 30.5 | 12.2 |
Finish rolling control:
the initial rolling temperature of the finish rolling is 1053 ℃, and the outlet temperature of the finish rolling is 896 ℃. The temperature difference between the head and the tail of the strip steel in a finish rolling area requires 28 ℃.
The cooling water quantity of the F1-F7 roller is 63%, the water pressure is 1.0mpa, and the cooling water temperature is 32 ℃.
The roll type of F1-F3 is-230 μm, the roll type of F4-F6 is-200 μm, and the roll type of the last roll type is-180 μm.
The slab rolling interval was 167s, and the rolling speed was 18m/s.
The roller forming amount of each plate blank of the finish rolling F1 frame is 5mm, the roller forming amount of the F2 frame is 4mm, the roller forming amount of the F3 frame is 4mm, the roller forming amount of each plate blank of the F4 frame is 9mm, the roller forming amount of the F5 frame is 7mm, the roller forming amount of the F6 frame is 9mm, and the roller forming amount of the F7 frame is 11mm.
The convexity of the strip steel is controlled at 72 mu m, and the wedge shape is controlled at 18 mu m.
The coiling temperature was controlled to 712 ℃.
The effect is as follows: no rib phenomenon after cold rolling.
Comparative example 1
And (3) rolling planning: the specification of the steel grade SPHE steel is 2.70 x 1250mm.
Heating control: the size of a casting blank is 230 multiplied by 1270mm, the total time of the furnace is 166min, the heating time of the second heating is 40min, the soaking period time is 48min, the discharging temperature is 1229 ℃, and the head-tail temperature difference is 15 ℃.
Rough rolling control: the roller profile of the roller adopts a concave roller with the diameter of-180 mu m, the roller is subjected to rough rolling for 6 times, and the outlet temperature of the rough rolling is 1083 ℃; the thickness of the rough rolled plate blank is as follows: 35mm, and the temperature difference of the rough rolling area of the strip steel is 10 ℃.
Rolling pass reduction
| Frame | Pass 1 | Pass 2 | Pass 3 | Pass 4 | Pass 5 | Pass 6 |
| Inlet thickness | 230 | 180 | 140 | 96 | 64 | 46 |
| Outlet thickness | 180 | 140 | 96 | 64 | 46 | 35 |
| Reduction rate/%) | 21.7 | 22.2 | 31.4 | 33.3 | 28.1 | 23.9 |
Finish rolling control:
the initial rolling temperature of the finish rolling is 1061 ℃, and the outlet temperature of the finish rolling is 898 ℃. The temperature difference between the head and the tail of the strip steel in the finish rolling area is 6 ℃.
The cooling water quantity of the F1-F7 roller is 61%, the water pressure is 1.0mpa, and the cooling water temperature is 45 ℃.
The roll type of F1-F3 is-150 μm, the frame type of F4-F6 is-150 μm, and the last frame type is-120 μm.
The slab rolling interval 143s and the rolling speed (roll speed) were 20m/s.
The roller quantity of each plate blank of a finish rolling F1 machine frame is 0mm, the roller quantity of an F2 machine frame is 1mm, the roller quantity of an F3 machine frame is 2mm, the roller quantity of each plate blank of an F4 machine frame is 3mm, the roller quantity of an F5 machine frame is 3mm, the roller quantity of an F6 machine frame is 2mm, and the roller quantity of an F7 machine frame is 1mm.
The convexity of the strip steel is controlled to be 50 mu m, and the wedge shape is controlled to be 23 mu m.
The coiling temperature was controlled to 692 ℃.
The effect is as follows: the phenomenon of ribbing appears after cold rolling.
The method for preventing the edge rib forming defect of the cold-rolled steel strip at least has the following advantages that:
the following technical means are adopted, including means of head-tail temperature difference control (heating control before rough rolling, rough rolling and finish rolling), rough rolling control (reduction rate and roll shape), finish rolling (initial rolling temperature, finish rolling temperature, cooling water, roll shape, roller string and the like), and the control of the convexity and wedge shape of the strip steel is realized.
The roll profile concavity of the rolls in the hot rolling rough rolling area and the hot rolling finish rolling area is designed, and the convexity of the strip steel in the finish rolling area is controlled, so that the stress of the contact part of the rolls and the edge part of the strip steel is reduced, the stress condition of the strip steel and the rolls is reduced, and the rolls are ensured to be uniformly worn. When the roller is contacted with the strip steel at the position with large local abrasion, the thickness of the corresponding strip steel at the position is not larger, and the ribbing is avoided. The cold rolling ribbing phenomenon caused by local high points of the cold-rolled strip steel or uneven hardness of the strip steel is solved.
The roller is contacted with the strip steel at high temperature during rolling, the surface of the roller is oxidized under the influence of high temperature, an oxide film can be formed more quickly through the control, the wear resistance is improved, and the abrasion of the roller is reduced. By reducing or equalizing the abrasion of the roller, the phenomena of cold rolling, rib rising and the like caused by the large thickness of the corresponding strip steel at the position when the position with large local abrasion of the roller is contacted with the strip steel can be prevented.
The position of the roller is changed by adjusting the roller string quantity, so that the abrasion position of the roller and the contact position of the strip steel are changed, and the local high points of the strip steel are reduced.
The embodiment of the invention also provides equipment for preventing the edge beading defect of the cold-rolled strip steel. The device for preventing the edge rib forming defect of the cold-rolled steel strip comprises a first concave roller, a second concave roller and a third concave roller; the first concave roller is arranged in the hot rolling rough rolling area; the second concave roller is arranged on the head area rack of the hot rolling finish rolling area; the third concave roller is arranged on a machine frame at the tail area of the hot rolling finish rolling area. The problem of the edge beading of the cold-rolled steel strip can be improved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method for preventing the edge rib forming defect of cold-rolled steel strip is characterized by comprising the following steps:
the roll profile of the hot rolling rough rolling area adopts a first concave roll, and the concavity range of the first concave roll is-290 to-300 mu m;
the convexity range of the strip steel in the hot rolling and finish rolling area is 60-80 mu m, the wedge range of the strip steel is less than or equal to 20 mu m, the finish rolling start temperature is controlled at 1053-1100 ℃, and the finish rolling temperature is controlled at 890-910 ℃;
dividing a rack roller in a hot rolling finish rolling area into three areas, namely a head area rack roller, a middle area rack roller and a tail area rack roller; the head area rack roller adopts a second concave roller, and the tail area rack roller adopts a third concave roller; the concavity range of the second concave roller is-220 to-230 mu m; the concavity range of the third concave roller is-170 to-180 mu m; the concavity of the second concave roller is smaller than the concavity of the third concave roller;
the middle parts of the roll surfaces of the first concave roll, the second concave roll and the third concave roll are both concavely arranged close to the roll shaft relative to the two ends of the roll.
2. The method for preventing the edge beading defect of the cold-rolled steel strip according to claim 1, wherein:
the middle area frame roller adopts a fourth concave roller, and the concavity range of the fourth concave roller is-190 to-200 mu m;
the concavity of the fourth concave roller is greater than the concavity of the second concave roller, and the concavity of the fourth concave roller is less than the concavity of the third concave roller.
3. The method for preventing the edge beading defect of the cold-rolled steel strip according to claim 2, wherein:
the hot rolling finish rolling area comprises seven frame rollers, wherein the second concave roller is adopted by the roller shapes from the first frame roller to the third frame roller; the fourth concave roller is adopted from the roller profile of the fourth frame roller to the roller profile of the third frame roller; the roller profile of the seventh frame roller adopts the third concave roller.
4. The method for preventing edge beading defects of cold-rolled steel strip according to any one of claims 1 to 3, wherein:
the heating temperature of the head of the strip steel is lower than the heating temperature of the tail of the strip steel, and the heating temperature difference range of the head of the strip steel and the tail of the strip steel is 30-60 ℃.
5. The method for preventing the edge beading defect of the cold-rolled steel strip according to claim 4, wherein:
in the hot rolling rough rolling area, the temperature difference range between the head of the strip steel and the tail of the strip steel is 20-50 ℃.
6. The method for preventing the edge beading defect of the cold rolled steel strip according to claim 5, wherein:
in the hot rolling finish rolling area, the temperature difference between the head of the strip steel and the tail of the strip steel ranges from 10 ℃ to 30 ℃.
7. The method for preventing the edge beading defect of the cold rolled steel strip according to any one of claims 1 to 3, wherein:
the hot rolling rough rolling adopts six passes, the reduction rate range of the first pass and the last pass is 10-15%, and the reduction rate range of the middle pass is more than or equal to 25%.
8. The method for preventing the edge beading defect of the cold rolled steel strip according to any one of claims 1 to 3, wherein:
in a hot rolling and finish rolling area, the cooling water quantity of a roller is 60-63%, the water pressure is 1.0mpa, the cooling water temperature is 20-38 ℃, the plate blank rolling interval is more than or equal to 150s, and the rolling speed is less than or equal to 18m/s.
9. The method for preventing the edge beading defect of the cold rolled steel strip according to claim 2, wherein:
in the hot rolling finish rolling area, the distance from a first rack roller to a third rack roller is more than 3mm; and the distance between the roller of the fourth frame and the roller of the seventh frame is more than 5mm.
10. An apparatus for preventing edge beading defect of a cold-rolled steel strip for performing the method for preventing edge beading defect of a cold-rolled steel strip according to any one of claims 1 to 9, wherein the apparatus for preventing edge beading defect of a cold-rolled steel strip comprises:
the first concave roller, the second concave roller, and the third concave roller;
the first concave roller is arranged in the hot rolling rough rolling area; the second concave roller is arranged on the head area rack of the hot rolling finish rolling area; the third concave roller is arranged on the tail area rack of the hot rolling finish rolling area.
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| WO2013156332A1 (en) * | 2012-04-18 | 2013-10-24 | Siemens Vai Metals Technologies Gmbh | Method for producing a strip |
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