CN114669608A - Control method for defects of hot-rolled medium-high carbon steel coil edge - Google Patents
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- 230000007547 defect Effects 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 32
- 229910000677 High-carbon steel Inorganic materials 0.000 title claims abstract description 28
- 238000005096 rolling process Methods 0.000 claims abstract description 76
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 31
- 239000010959 steel Substances 0.000 claims abstract description 31
- 238000009749 continuous casting Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 230000009471 action Effects 0.000 claims abstract description 7
- 238000009957 hemming Methods 0.000 claims abstract description 7
- 230000002441 reversible effect Effects 0.000 claims abstract description 3
- 230000009467 reduction Effects 0.000 claims description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 9
- 238000005098 hot rolling Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 2
- 239000000498 cooling water Substances 0.000 claims 1
- 239000006104 solid solution Substances 0.000 claims 1
- 238000003723 Smelting Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 6
- 230000006872 improvement Effects 0.000 description 6
- 229910001339 C alloy Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000009966 trimming Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000001105 regulatory effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
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Classifications
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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
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- 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
-
- 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
- B21B45/06—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 of strip material
-
- 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
Abstract
The invention discloses a method for controlling defects of a hot-rolled middle-high carbon steel hemming part, belonging to the technical field of steel smelting, and comprising the following steps: 1. obtaining a right-angle plate blank after conventional smelting and continuous casting; 2. the slab is fed by heat and is charged in 8 hours, and the charging temperature is more than or equal to 400 ℃; 3. putting the plate blank into a heating furnace for heating; 4. rough descaling is carried out after the steel plate is taken out of the furnace, and the pressure is more than or equal to 18 MPa; 5. the four-roller reversible roughing mill adopts 5 or 7 passes for rolling; 6. the descaling pass of the rough rolling body is 1, 3 or 5; 7. reducing the width by using a large vertical roller, wherein the action passes are 1, 3 and 5; 8. the thickness of the rough rolling intermediate billet is set to be 36-52mm, and the rough rolling outlet temperature is 1025-1135 ℃; 9. the finish rolling steel feeding temperature is 850-. The proportion of the defects in the length direction of the steel coil is reduced to be less than 0.3 percent.
Description
Technical Field
The invention belongs to the technical field of steel smelting, and particularly relates to a method for controlling defects of a hot-rolled middle-high carbon steel hemming part.
Background
The coil steel for the wear parts such as saw blades and the like is generally hot-rolled medium-high carbon alloy steel, and on one hand, high strength is required, and on the other hand, the surface is required to have no cracks or black line defects. Generally, after a user trims the edge of an original coil (the maximum trimming amount is 10mm), raw materials are sliced according to the size of a finished product, so that if the user operates conventionally, the defect that the distance between the defect and the edge of the strip steel is more than 10mm on the surface of the strip steel is inherited to the finished product, and the quality of the finished product is seriously influenced; if the customer increases the amount of trimming, on one hand, the trimming loss will be too large, and on the other hand, the production difficulty and equipment wear of the customer will increase, so that the edge defect must be controlled to be less than 10mm for the production of this variety.
However, the current defect of edge crack formation of the medium-high carbon alloy steel in the hot rolling process is not deeply researched, so that the defect can be only controlled to be more than 10mm at present and cannot be thoroughly and effectively controlled.
Disclosure of Invention
The invention aims to provide a method for controlling the edge defects of a hot-rolled medium-high carbon steel hemming part, which can improve the edge defects of the hot-rolled medium-high carbon steel hemming part, greatly reduce the edge defects, meet the use requirements of users and solve at least one aspect of the problems and the defects in the background technology.
According to one aspect of the invention, the method for controlling the defects of the coil edge part of the medium-high carbon steel in the hot rolling comprises the following steps:
firstly, a plate blank is heated in a heating furnace;
rough descaling: rough descaling is carried out after the steel plate is taken out of the furnace;
rough rolling: rolling by adopting 5 or 7 passes; dephosphorization and width reduction are carried out in the rough rolling process, wherein the descaling passes of the rough rolling body are 1, 3 and 5, and the descaling water is closed in other passes; reducing the width by using a rough rolling large vertical roller, wherein the action pass is 1, 3, 5 or 7;
finish rolling: coiling after rolling by a 7-stand finishing mill, and finishing rolling steel feeding temperature is 850-;
wherein the thickness of the rough rolling intermediate billet is set to be 36-57mm, and the rough rolling outlet temperature is 1025-1135 ℃.
Optionally, the slab is a right-angle slab.
Optionally, the slab is produced in the heating step by a hot charging mode, and the charging temperature is more than or equal to 400 ℃.
Optionally, the slab tapping temperature in the heating step is controlled to 1190-.
Optionally, a four high reversing roughing mill is used in the roughing step.
Optionally, the difference between the width of the slab and the width of the finished product is controlled to be 20-60 mm.
Optionally, in the rough rolling step, when 5 passes of rolling are adopted, the flat roll reduction ratio distribution ratio is as follows: 20-22%, 25-27%, 26-28%, 27-29% and 18-20%; when 7-pass rolling is adopted, the proportion of the flat roll reduction ratio is as follows: 15% -18%, 18% -21%, 19% -20%, 16% -18%, 17% -19%, 17% -21% and 14% -21%.
Optionally, in the width reducing step, the width is reduced by using a large rough rolling vertical roll, and the outlet width is ensured to be the set rough rolling outlet width, wherein the width reduction amount distribution mode of 5 passes of the large vertical roll is as follows: distributing the width reduction quantity of more than or equal to 40 percent, more than or equal to 40 percent and less than or equal to 20 percent of the total width reduction quantity into 1, 3 and 5 width reduction passes respectively, wherein the distribution mode of the width reduction quantity of 7 passes of the large vertical roll is as follows: the width reducing amount is respectively distributed to 1, 3, 5 and 7 width reducing passes according to the proportion of more than or equal to 35 percent, more than or equal to 30 percent, more than or equal to 20 percent and less than or equal to 15 percent of the total width reducing amount.
Optionally, the medium and high carbon steel coil comprises the following components: c: 0.72-0.80%, Si: 0.2-0.45%, Mn: 0.60-0.90%, Cr: 0.30 to 0.60 percent of the total weight of the alloy, less than or equal to 0.018 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.06 percent of Al, and the balance of iron and inevitable impurities.
Compared with the prior art, the invention has the beneficial effects that:
the thickness of the rough rolling intermediate billet is set to be 36-57mm, and the rough rolling outlet temperature is 1025-1135 ℃. The research shows that the edge defects of the medium-high carbon steel in hot rolling are mainly caused by flattening and widening in the rolling process, the thickness of the intermediate billet is increased, and the reduction of the probability of flattening and widening is facilitated. The residual rolling reduction is put into the finish rolling procedure mainly because the finish rolling procedure has the tension action of a loop to promote the almost all metal to flow towards the rolling direction, the spreading probability is extremely low, and the problem of edge defects generated in the finish rolling process can be avoided. Therefore, the thickness of the intermediate blank is properly increased according to the thickness of the finished product, and the outlet temperature of rough rolling is 1025 ℃ and 1135 ℃, so that the edge part can be ensured to be kept above 910 ℃. The possibility that the edge enters a two-phase area is reduced, and the deformation uniformity of the strip steel is increased.
Compared with other technologies, the invention has the following advantages: 1. no equipment improvement is needed; 2. the proportion of the defects in the length direction of the steel coil is reduced to below 0.3 percent from about 30 percent before improvement, and the problem of the defects of the middle-high carbon steel coil edge part is basically solved.
Drawings
FIG. 1 is a graph showing the edge defect profile of hot-rolled medium-high carbon steel 75CR/75CR1 produced by the prior art;
FIG. 2 is a graph showing the edge defect appearance of 75CR/75CR1 for medium-high carbon steel in hot rolling produced by the method provided by the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are further specifically described below by examples. A control method for controlling defects of a hot-rolled medium-high carbon steel coil edge part is limited.
Furthermore, in the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details.
Referring to fig. 1 and 2, in one aspect, according to one general technical concept of the present invention, there is provided a method for controlling a defect of a hot rolled medium-high carbon steel hemming portion, comprising the steps of:
1) adopting a continuous casting slab subjected to conventional smelting and continuous casting;
2) the slab is produced by adopting a hot charging mode, and the charging temperature is more than or equal to 400 ℃;
3) heating the plate blank in a heating furnace, controlling the temperature of discharge at 1190-;
4) rough descaling is carried out after the steel plate is taken out of the furnace;
5) the four-roller reversible roughing mill adopts 5 or 7 passes for rolling;
6) the descaling passes of the rough rolling body are 1, 3 and 5, and the descaling water is closed in other passes;
7) reducing width by using a rough rolling large vertical roller, wherein the action pass is 1, 3, 5 or 7;
8) the thickness of the rough rolling intermediate billet is set to be 36-57mm, and the rough rolling outlet temperature is 1025 & 1135 ℃;
9) the finish rolling steel feeding temperature is 850-900 ℃, and the steel is rolled into coils by a 7-stand finishing mill.
In the embodiment of the application, the continuous casting billet is delivered in a hot charging mode, and the charging temperature is regulated to be more than or equal to 400 ℃. The medium-high carbon alloy steel belongs to cold crack sensitive steel, and slab cracks, particularly on the edge part, are easily caused under the condition of improper slow cooling. By adopting the process, the continuous casting billet can be ensured to be put into a furnace to be reheated under the condition of higher plasticity, and the surface and the edge of the continuous casting billet are ensured to be free of defects before being discharged and rolled.
Carry out the slab reheating in the embodiment of the application, it is fast to dispel the heat in order to avoid rough rolling in-process arris limit portion, gets into the diphasic district and leads to warping the uneven folding black line that produces, will go out the stove temperature and improve as far as possible, ensures simultaneously that the high temperature section is sufficient in the stove time, obtains the inside and outside even unanimous continuous casting billet of temperature casting blank, nevertheless needs control stove time to avoid leading to the carburization phenomenon in stove time overlength.
In the embodiment of the application, the descaling passes of the rough rolling body are 1, 3 and 5, the descaling water is closed in other passes, and under the general condition of hot rolling of medium-high carbon steel 75CR/75CR1, a user can open a flat plate to directly feed, and then quenching and tempering heat treatment are carried out, so that the requirement on surface scale is not high. Meanwhile, the descaling water action increases the heat dissipation of the edges of the plate blank, so that the temperature of the edges is too low, and the finish temperature of rough rolling is increased as much as possible.
In the embodiment of the application, the thickness of the rough rolling intermediate billet is set to be 36-57mm, and the rough rolling outlet temperature is 1025-1135 ℃. The research shows that the edge defects of the medium-high carbon steel in hot rolling are mainly caused by flattening and widening in the rolling process, the thickness of the intermediate billet is increased, and the reduction of the probability of flattening and widening is facilitated. The residual rolling reduction is put into the finish rolling procedure mainly because the finish rolling procedure has the tension action of a loop to promote the almost all metal to flow towards the rolling direction, the spreading probability is extremely low, and the problem of edge defects generated in the finish rolling process can be avoided. Therefore, the thickness of the intermediate blank is properly increased according to the thickness of the finished product, and the outlet temperature of rough rolling is 1025 ℃ and 1135 ℃, so that the edge part can be ensured to be kept above 910 ℃. The possibility that the edge enters a two-phase area is reduced, and the deformation uniformity of the strip steel is increased.
In one embodiment, the difference between the width of the casting blank and the width of the finished product in the step 1) is controlled to be 20-60 mm.
The width size of the continuous casting billet is controlled by the embodiment because the smaller the constant-width side pressure is, the smaller the height of the dog bone generated at the edge is, the smaller the spread in the subsequent rolling process is, and the control of the black line is facilitated.
In one embodiment, in the step 5), when 5 passes of rolling are adopted, the flat roll reduction ratio distribution ratio is as follows: 20-22%, 25-27%, 26-28%, 27-29% and 18-20%; when 7-pass rolling is adopted, the proportion of the flat roll reduction ratio is as follows: 15% -18%, 18% -21%, 19% -20%, 16% -18%, 17% -19%, 17% -21% and 14% -21%.
In the embodiment, the thickness of the rough-rolled steel billet is controlled by setting the proportion of the reduction ratio of the flat roll, so that the edge defects caused by flattening and widening in the rolling process are reduced.
In one embodiment, in the step 7), the large vertical roll is used for width reduction, and the outlet width is ensured to be the set rough rolling outlet width in the step 1, the step 3, the step 5 or the step 7, or in the step 1, the step 3, the step 5 and the step 7, wherein the width reduction amount distribution mode of the large vertical roll in the step 5 is as follows: the method comprises the following steps of respectively distributing more than or equal to 40 percent, more than or equal to 40 percent and less than or equal to 20 percent of the total width reduction quantity into 1, 3 and 5 width reduction passes, wherein the width reduction quantity distribution mode of 7 passes of the large vertical roll is as follows: the width reducing amount is distributed to 1, 3, 5 and 7 width reducing passes respectively according to the proportion of more than or equal to 30 percent, more than or equal to 25 percent and less than or equal to 15 percent of the total width reducing amount, and the forward distribution of the width reducing amount is to ensure that the width expanding amount of the last pass is smaller.
In one embodiment, the slab is the right angle type continuous casting billet, adopts the right angle type continuous casting billet mainly because through the research discovery of edge metal flow law, the right angle continuous casting billet edge is for obtuse angle continuous casting billet, and its edge rolls the back and is closer to limit portion position.
The well high carbon steel coil composition that provides in this application implementation includes: c: 0.72-0.80%, Si: 0.2-0.45%, Mn: 0.60-0.90%, Cr: 0.30-0.60 percent of iron, less than or equal to 0.018 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.06 percent of Al, and the balance of iron and inevitable impurities.
The invention is further illustrated by the following specific examples:
the values of the relevant process parameters of the examples and comparative examples of the present invention are shown in tables 1, 2, 3 and 4, and the edge defect improvement effect of the examples of the present invention is shown in table 5.
Table 1: in the embodiment of the invention, each relevant process parameter value is 1.1
Table 2: in the embodiment of the invention, each relevant process parameter value is 1.2
Table 3: in the embodiment of the invention, each relevant process parameter value is 1.3
Table 4: in the embodiment of the invention, each relevant process parameter value is 1.4
Table 5: edge defect improvement effect in embodiments of the present invention
As can be seen from Table 5, when the hot-rolled medium-high carbon 75CR/75CR1 alloy steel is produced according to the improved process, the edge defects are remarkably controlled, the proportion of the defects in the length direction of the steel coil in the example 2 is less than or equal to 3 percent, the steel coils in the other examples do not form obvious defects, the proportion of the defects in the length direction of the steel coil in the multiple groups of examples is reduced to be less than 0.3 percent from about 30 percent before the improvement, the loss of user raw materials is greatly reduced, and the yield of the original product is greatly improved.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A control method for defects of a hot-rolled medium-high carbon steel hemming part is characterized by comprising the following steps:
heating: firstly, a plate blank is heated in a heating furnace;
rough descaling: rough descaling is carried out after the steel plate is taken out of the furnace;
rough rolling: 5-pass rolling or 7-pass rolling is adopted;
finish rolling: rolling the steel into a steel coil by a 7-stand finishing mill, and finishing rolling the steel at the steel feeding temperature of 850-;
wherein the thickness of the rough rolling intermediate billet is set to be 36-57mm, and the rough rolling outlet temperature is 1025-1135 ℃;
the proportion of the defects in the length direction of the steel coil to the total length is less than or equal to 3 percent;
the medium-high carbon steel coil comprises the following components: c: 0.72-0.80%, Si: 0.2-0.45%, Mn: 0.60-0.90%, Cr: 0.30-0.60 percent of iron, less than or equal to 0.018 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.06 percent of Al, and the balance of iron and inevitable impurities.
2. The method for controlling the defects of the edge curl portion of the medium-high carbon steel in hot rolling according to claim 1, wherein the slab is produced in a hot charging mode in the heating step, and the charging temperature is more than or equal to 400 ℃.
3. The method for controlling the defects of the hot-rolled medium-high carbon steel coil edge part as claimed in claim 1 or 2, wherein the tapping temperature of the slab in the heating step is controlled to 1190-1240 ℃, the solid solution time is more than or equal to 30min, and the furnace time is 140-250 min.
4. The method for controlling the defects of the edge rolling part of the hot-rolled medium-high carbon steel according to claim 1, wherein the slab is a right-angle continuous casting slab; the rough rolling step uses a four-high reversible rough rolling mill.
5. The method for controlling the defects of the edge curl portion of the medium-high carbon steel in the hot rolling according to claim 4, wherein the difference between the width of the plate blank and the width of the finished product is controlled to be 20-60 mm.
6. The method for controlling the defects of the hot-rolled medium-high carbon steel coil edge part according to claim 1, characterized in that in the rough rolling step, 5 passes of rolling are adopted, and dephosphorization and width reduction are performed in the rough rolling process, wherein the descaling passes of a rough rolling body are 1, 3 and 5 passes, and the descaling water is closed in other passes; the width reduction is carried out by using a rough rolling large vertical roller, the number of action passes is 1, 3 and 5, and the proportion of the reduction ratio of a 5-pass rolling flat roller is as follows: 20-22%, 25-27%, 26-28%, 27-29% and 18-20%.
7. The method for controlling the defects of the curled portion of the medium-high carbon steel hot-rolled according to claim 6, wherein in the width reducing step, the large rough-rolled vertical roll is used for reducing the width to ensure that the outlet width is the set rough-rolled outlet width, and the width reduction distribution mode of the large vertical roll in 5 passes is as follows: the width reduction amount is respectively distributed to 1, 3 and 5 width reduction passes according to the proportion of more than or equal to 40 percent, more than or equal to 40 percent and less than or equal to 20 percent of the total width reduction amount.
8. The method for controlling the defects of the hot-rolled medium-high carbon steel hemming portion according to claim 1, wherein in the rough rolling step, 7 passes of rolling are adopted; dephosphorization and width reduction are carried out in the rough rolling process, wherein the descaling passes of the rough rolling body are 1, 3 and 5, and the descaling water is closed in other passes; and (4) reducing the width by using a large rough rolling vertical roller, wherein the working passes are 1, 3, 5 and 7.
9. The method for controlling the defects of the edge rolling portions of the hot-rolled medium-high carbon steel according to claim 8, wherein in the rough rolling step, the proportion of the reduction ratio of the 7-pass flat rolls is as follows: 15% -18%, 18% -21%, 19% -20%, 16% -18%, 17% -19%, 17% -21% and 14% -21%;
in the width reducing step, the width reducing amount distribution mode of 7 passes of the large vertical roll is as follows: the width reducing amount is respectively distributed to 1, 3, 5 and 7 width reducing passes according to the proportion of more than or equal to 35 percent, more than or equal to 30 percent, more than or equal to 20 percent and less than or equal to 15 percent of the total width reducing amount.
10. The method for controlling the defects of the curled portion of the medium-high carbon steel in the hot rolling according to claim 7 or 8, wherein in the width reducing step, the flow rate of cooling water of the large vertical roll is controlled to be less than or equal to 12m3/h, and the steel passing amount of the large vertical roll is controlled to be less than or equal to 15 ten thousand tons.
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| CN102101124A (en) * | 2009-12-22 | 2011-06-22 | 鞍钢股份有限公司 | Production method for eliminating edge defects of hot rolled strip steel |
| CN102699028A (en) * | 2012-02-24 | 2012-10-03 | 宝山钢铁股份有限公司 | Method for eliminating linear edge defects of hot-rolled low-carbon steel |
| CN109604338A (en) * | 2018-12-17 | 2019-04-12 | 武汉钢铁有限公司 | A kind of manufacturing method reducing hot rolling pipe line steel edge hairline defect width |
| CN110576044A (en) * | 2019-09-05 | 2019-12-17 | 首钢集团有限公司 | Method for eliminating thin lines on hot-rolled edge of 440 MPa-level IF steel |
| CN111633026A (en) * | 2020-05-21 | 2020-09-08 | 武汉钢铁有限公司 | Control method for reducing linear defects at edge of hot-rolled medium-high carbon alloy steel |
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