WO2022230230A1 - 冷延鋼板の製造方法及び製造設備 - Google Patents
冷延鋼板の製造方法及び製造設備 Download PDFInfo
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- WO2022230230A1 WO2022230230A1 PCT/JP2021/046322 JP2021046322W WO2022230230A1 WO 2022230230 A1 WO2022230230 A1 WO 2022230230A1 JP 2021046322 W JP2021046322 W JP 2021046322W WO 2022230230 A1 WO2022230230 A1 WO 2022230230A1
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- steel sheet
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 37
- 239000010960 cold rolled steel Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 247
- 239000010959 steel Substances 0.000 claims abstract description 247
- 238000010438 heat treatment Methods 0.000 claims abstract description 91
- 238000005096 rolling process Methods 0.000 claims abstract description 60
- 238000005097 cold rolling Methods 0.000 claims abstract description 38
- 238000001816 cooling Methods 0.000 claims 1
- 229910052710 silicon Inorganic materials 0.000 description 43
- 229910000976 Electrical steel Inorganic materials 0.000 description 30
- 238000002474 experimental method Methods 0.000 description 17
- 238000005452 bending Methods 0.000 description 11
- 238000005336 cracking Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 9
- 238000011144 upstream manufacturing Methods 0.000 description 8
- 230000007613 environmental effect Effects 0.000 description 7
- 238000005304 joining Methods 0.000 description 6
- 239000002436 steel type Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000000137 annealing Methods 0.000 description 4
- 230000001629 suppression Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012552 review 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
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/221—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by cold-rolling
Definitions
- the present invention relates to a method and equipment for manufacturing cold-rolled steel sheets.
- Patent Literature 1 describes a method of heating the width direction end portion of a steel sheet so as to reach a designated target temperature on the entry side of the rolling mill.
- Patent Document 2 describes a method of uniformly heating and rolling a steel plate over its entire area.
- the present invention has been made in view of the above problems, and an object thereof is to provide a cold-rolled steel sheet manufacturing method and manufacturing equipment capable of stably rolling a silicon steel sheet with low environmental load. .
- the inventors of the present invention conducted extensive research and found that the fracture suppression temperature (steel plate temperature at which the fracture suppression effect is high) is higher at the widthwise ends than at the widthwise central portion. I found out. Therefore, the inventors believe that appropriately controlling the output of a transverse-type full-width heating device that heats the entire width of the steel plate and using it is very effective in preventing breakage and in terms of the environment.
- the following invention has been conceived.
- a method for manufacturing a cold-rolled steel sheet according to the present invention includes a transverse full-width heating device that heats the steel plate over the entire width direction of the steel sheet, and a transverse full-width heating device arranged downstream in the rolling direction with respect to the transverse full-width heating device. , a cold rolling mill for rolling the steel sheet, and a method for manufacturing a cold-rolled steel sheet, wherein the temperature at the widthwise end portion of the steel sheet is higher than the temperature at the widthwise central portion of the steel sheet at the entry side of the cold rolling mill heating the steel sheet using the transverse full-width heating apparatus such that the
- the temperatures of the widthwise central portion and the widthwise end portions of the steel sheet on the entrance side of the cold rolling mill change according to the Si content of the steel sheet.
- the temperatures of the widthwise central portion and the widthwise end portions of the steel sheet on the entry side of the cold rolling mill be the temperatures calculated by the following formulas (1) and (2) that vary depending on the Si content ⁇ .
- the cold-rolled steel sheet manufacturing equipment includes a transverse full-width heating device that heats the steel plate over the entire width direction of the steel plate, and a transverse full-width heating device arranged downstream in the rolling direction with respect to the transverse full-width heating device. and a cold rolling mill for rolling the steel sheet, wherein the transverse full-width heating device is configured such that the temperature of the widthwise end portion of the steel sheet is higher than the temperature of the widthwise center portion of the steel sheet on the entry side of the cold rolling mill. Heat the steel plate so that it rises.
- the transverse-type full-width heating device preferably changes the temperature of the widthwise central portion and the widthwise end portions of the steel sheet on the entry side of the cold rolling mill according to the Si content of the steel sheet.
- the transverse type full width heating device changes the temperature of the width direction central part and the width direction end part of the steel plate on the entry side of the cold rolling mill depending on the Si content ⁇ It is preferable to heat to the calculated temperature.
- the transverse full-width heating device is preferably installed within 10 m from the entry side of the cold rolling mill.
- silicon steel sheets can be stably rolled with low environmental load.
- FIG. 1 is a schematic diagram showing the configuration of a cold-rolled steel sheet manufacturing facility according to an embodiment of the present invention.
- FIG. 2 is a diagram showing the results of evaluating the temperature dependence of bending crack resistance of a silicon steel sheet.
- FIG. 3 is a diagram showing estimation results of the steel sheet temperature necessary for suppressing brittle fracture according to the Si content of the steel sheet.
- FIG. 4 is a graph showing the results of evaluating the temperature dependence of edge crack resistance of a silicon steel sheet.
- FIG. 5 is a diagram showing estimation results of the steel sheet temperature necessary for suppressing edge cracking according to the Si content of the steel sheet.
- FIG. 1 is a schematic diagram showing the configuration of a cold-rolled steel sheet manufacturing facility according to one embodiment of the present invention.
- a cold-rolled steel sheet manufacturing facility (hereinafter abbreviated as "manufacturing facility") according to one embodiment of the present invention is a continuous tandem rolling line having a plurality of stands.
- a device 2 , a looper 3 , a full width heating device 4 , a thermometer (plate temperature measuring device) 5 , a cold tandem rolling mill 6 , a cutting machine (cutting device) 7 and a tension reel 8 are provided.
- the payoff reel 1 is a device that pays out the steel plate S.
- a manufacturing facility may have a plurality of payoff reels 1 . In this case, a plurality of payoff reels pay out different steel sheets S respectively.
- the joining device 2 forms a joined steel plate by joining the tail end of the steel plate (leading material) paid out first from the payoff reel 1 and the leading end of the steel plate (following material) paid out later from the payoff reel 1. It is a device that A laser welder is preferably used as the joining device 2 .
- the looper 3 is a device that stores the steel plate S so that cold rolling by the cold tandem rolling mill 6 can be continued until the steel plates are joined together by the joining device 2 (until joining is completed). .
- the full-width heating device 4 is a device that heats the steel plate S over the entire width direction and rolling direction (longitudinal direction) of the steel plate S.
- the full width heating device 4 has a temperature gradient in the width direction of the steel sheet S, and is a transverse capable of making the temperature of the edge portion (width direction end portion) of the steel plate S higher than the temperature of the width direction central portion of the steel plate S. It is composed of a type induction heating device.
- the full width heating device 4 is a steel plate whose temperatures at the width direction central portion and the edge portion of the steel plate S at the entrance side of the cold tandem rolling mill 6 are calculated by the following formulas (1) and (2), respectively. It is preferable to heat the steel sheet S so that the temperature T C and the temperature T E correspond to the Si content of S. As a result, brittle fracture and edge cracking of the steel sheet S can be effectively suppressed.
- the thermometer 5 is a device that measures the surface temperature of the steel plate S.
- the thermometer 5 is preferably installed near the entry side of the cold tandem rolling mill 6 .
- a value that compensates for the steel plate temperature that decreases between the thermometer 5 and the entry side of the cold tandem rolling mill 6 is used. By doing so, it will be put into practical use.
- the cold tandem rolling mill 6 is a device that cold-rolls the steel sheet S in order to set the thickness of the steel sheet S heated by the full-width heating device 4 to a target thickness.
- the cold tandem rolling mill 6 has five stands, but the number of stands is not particularly limited.
- the cold tandem rolling mill 6 has a form called 4Hi having four rolls in one stand, but it is not limited to this, and other forms such as 6Hi are also applicable. can do.
- the cutting machine 7 is a device that cuts the steel plate S after cold rolling.
- the tension reel 8 is a device that winds up the steel plate S cut by the cutting machine 7 .
- the form of the tension reel 8 is not limited, and may be, for example, a carousel tension reel.
- the manufacturing facility may have a plurality of tension reels 8 . In this case, the plurality of tension reels 8 wind up the plurality of steel plates S continuously.
- the equipment provided in the manufacturing facility is not limited to the equipment described above.
- the manufacturing equipment may be such that the full width heating device 4 and the entry side of the cold tandem rolling mill 6 are arranged in this order (more preferably adjacently arranged) within 10 m. Therefore, the rolling mill may be a reverse rolling mill instead of a tandem rolling mill. In this case, the full width heating device 4 and the rolling mill are arranged in this order in the first pass.
- the temperature of the steel plate S measured by the thermometer 5 is measured by the full-width heating device 4, the target temperature of the steel plate S on the delivery side of the full-width heating device 4, and the steel plate S is heated by the full-width heating device 4.
- the target temperature of the full-width heating device 4 is determined based on the time (that is, the heating time) for passing through and the plate thickness of the steel plate S.
- the target temperature of the steel sheet S heated by the full-width heating device 4 takes into consideration the distance between the thermometer 5 and the full-width heating device 4 and the distance between the thermometer 5 and the cold tandem rolling mill 6. should be set to temperature.
- the target temperature of the steel sheet S on the delivery side of the full-width heating device 4 may be set as the target temperature of the steel plate S heated by the full-width heating device 4. Not much of a problem.
- the thermometer 5, and the cold tandem rolling mill 6 is far away, the steel plate S reaches the entry side of the cold tandem rolling mill 6. It is necessary to set the target temperature of the steel sheet S heated by the full-width heating device 4 in consideration of the temperature drop to .
- the amount of energy used for heating the steel sheet should be small, and the full width heating device 4 and the thermometer 5 should be placed as close to the cold tandem rolling mill 6 as possible.
- the inventors of the present invention investigated the fracture rate when cold rolling a silicon steel sheet using a tandem rolling mill having five stands. As a result, it was found that silicon steel sheets with a high Si content had a higher fracture rate than silicon steel sheets with a low Si content.
- breakage on the upstream side such as #1std (hereinafter, the Nth stand from the upstream side in the conveying direction of the steel plate is denoted as "#Nstd"), #2std, etc., and #4std, etc. It was found that the cause was different from the breakage on the downstream side of #5std.
- bending crack resistance was evaluated when bending strain was applied to the steel plate on a laboratory scale. This is because the resistance to bending cracking in this experiment is thought to be correlated with brittle fracture due to bending deformation at the sheet threading roll and the shape detector at the upstream stand described above.
- the plate thickness is 2 mm
- the Si content is 1.8 mass%, 2.8 mass%, 3.3 mass%, and 3.7 mass% (hereinafter referred to as a silicon steel sheet with a Si content of Mmass% is referred to as “M% Si steel”) were annealed at 800° C. (corresponding to hot-rolled sheet annealing).
- the silicon steel sheet after annealing was pickled, and a test material having a width of 24 mm and a length of 250 mm was cut out using a shearing machine. After that, both end faces were ground by 2 mm each to remove processing strain caused by shearing. This suppressed the occurrence of edge breakage.
- the 1.8% Si steel and the 2.8% Si steel are steel types in which brittle fracture is unlikely to occur.
- 3.3% Si steel and 3.7% Si steel are steel types in which brittle fracture occurs at a frequency of about several percent, especially in the upstream stand.
- the steel sheet temperature at the entry side of the rolling mill is about the same as the temperature in the factory, and is around 15°C in winter.
- the temperature dependence of the bending crack resistance of silicon steel sheets was investigated when the steel sheet temperature was in the range of 15°C to 45°C.
- a steel plate with a thickness of 2 mm was rolled at a rolling reduction of 50% to produce a steel plate with a thickness of 1 mm. This simulates #1std.
- the steel plate was passed through a roller leveler by simulating the bending deformation of the steel plate by a threading roll and a shape detector. Then, bending deformation was applied to the steel plate to evaluate bending crack resistance.
- the roller leveler has 11 upper and lower work rolls with a diameter of 50 mm, and the roll interval is 60 mm.
- the 1.8% Si steel did not break up to a tightening amount of 4.0 mm, regardless of the temperature of the steel plate (15 to 45°C).
- the 2.8% Si steel when the steel plate temperature was 15°C, breakage occurred at a tightening amount of 3.5 mm, but at 25°C or higher, breakage did not occur up to a tightening amount of 4.0 mm.
- the 3.3% Si steel fracture occurred at a tightening amount of 1.5 mm when the steel plate temperature was 15°C and at a tightening amount of 3.0 mm at 25°C. However, when the steel plate temperature was 35° C. or higher, no breakage occurred up to a tightening amount of 4.0 mm.
- FIG. 3 shows the result of estimating the steel plate temperature necessary for suppressing brittle fracture according to the Si content of the steel plate based on the results of this experiment.
- the approximation curve in the drawing is represented by the following formula (3).
- brittle fracture did not occur in the 1.8% Si steel even at a steel plate temperature of 15° C. up to a tightening amount of 4.0 mm.
- the value of the Si content ⁇ [%] in the formula (3) is practically considered to be about ⁇ >2.
- the steel plate temperature T Cmin calculated from the formula (3) is the minimum required temperature, and from the viewpoint of suppression of breakage, this temperature or higher is sufficient. However, if the steel sheet temperature becomes too high, the steel sheet shape and lubricity are affected, so the steel sheet temperature is set to 200° C. or less. Moreover, the upper limit of 4.5% of the Si content ⁇ was set from a range in which the temperature of the steel plate edge portion, which will be described later, is 200° C. or less.
- the steel plate was rolled on a laboratory scale to evaluate the presence or absence of edge cracks.
- the edge crack that occurred on the upstream side in the rolling direction expanded and fractured as it progressed to the stand on the downstream side in the rolling direction. If it is possible to completely suppress the cracking of the edge of the steel sheet, it is possible to suppress the breakage due to the edge cracking.
- four types of silicon steel plates 1.8% Si steel, 2.8% Si steel, 3.3% Si steel, and 3.7% Si steel, each having a thickness of 2 mm, were cut to a width of 20 mm. and 250 mm long and annealed at 800° C. (equivalent to hot-rolled sheet annealing). Then, the silicon steel sheet after annealing was pickled. It can be considered that the state of the steel plate edge portion at this time is close to the actual state at the entry side of the continuous cold rolling mill.
- Si steel is a steel type in which cracks at the steel plate edges are less likely to occur.
- 3.3% Si steel and 3.7% Si steel are steel types in which steel plate edge cracks occur at a frequency of about several percent.
- the steel sheet temperature at the entry side of the rolling mill is about the same as the temperature in the factory, and is around 15°C in winter. Therefore, the temperature dependence of the edge crack resistance of silicon steel sheets was investigated when the steel sheet temperature was in the range of 15°C to 65°C.
- FIG. 5 shows the result of estimating the temperature necessary for suppressing edge cracking of the steel sheet according to the Si content of the steel sheet based on the results of this experiment.
- the approximation curve in the drawing is represented by the following formula (4).
- the 1.8% Si steel did not suffer edge cracks even at a steel plate temperature of 15° C., so it is considered unnecessary to heat the steel plate by the full-width heating device 4 .
- the Si content ⁇ [%] in the formula (4) is practically considered to be about ⁇ >2.
- the steel plate temperature T Emin calculated from the formula (4) is the minimum required temperature, and from the viewpoint of suppression of breakage, this temperature or higher is sufficient. However, if the steel sheet temperature becomes too high, the steel sheet shape and lubricity are affected, so the steel sheet temperature is set to 200° C. or less. Moreover, the upper limit of 4.5% of the Si content ⁇ was set from the range in which the temperature of the steel plate edge portion calculated from the formula (4) is 200° C. or less. The steel plate is heated within a range of 30 mm or more from the edge of the steel plate. This is because it is the influence range of width widening in cold rolling that affects steel plate edge cracks, and this range is said to be about 30 mm from the edge of the steel plate.
- the steel plate heating temperature required to suppress breakage from the central portion in the width direction of the steel plate and the breakage from the edge portion are different.
- the temperature required to suppress breakage from the center in the width direction is 45°C or higher
- the temperature required to suppress edge cracking is 65°C or higher.
- the temperature of the edge portion is higher than that of the center portion in the width direction even for the same steel type. It was found that it was necessary to provide a temperature gradient in the width direction of the film, and the present invention was conceived.
- the heating device 6 acquires information indicating the Si content of the preceding material and the succeeding material, and sets the target temperature based on the information. Change, decide. Further, in the present embodiment, the material to be rolled is described as a silicon steel sheet, but the type of steel sheet is not limited. Steel sheets other than silicon steel sheets to which the technique of the present invention can be preferably applied include, for example, high-strength steel sheets and high-alloy steel sheets.
- the width direction is The temperature required to suppress fracture from the center and edge cracks is controlled appropriately to suppress fracture of the steel plate. Therefore, according to the cold-rolled steel strip manufacturing facility and the cold-rolled steel strip manufacturing method according to one embodiment of the present invention, when the silicon steel sheet is cold-rolled, breakage of the steel sheet is suppressed with the minimum necessary energy. Therefore, the silicon steel sheet can be stably cold rolled with minimum environmental load.
- a full-width heating device 4 is installed on the entry side of the cold rolling mill so that the temperature of the steel sheet on the entry side of the rolling mill can be set to an arbitrary temperature. Then, it was finished to a predetermined thickness by a 5-stand cold tandem rolling mill.
- All of the steel types used in this example were silicon steel sheets, which were divided into three groups according to the Si content. Specifically, there are three groups: a group with a Si content of 1.0 mass% to 2.0 mass%, a group with a Si content of 2.0 mass% to 3.0 mass%, and a group with a Si content of 3.0 mass% to 3.5 mass%.
- Each group has a thickness of 1.8 mm to 2.4 mm before rolling and a thickness of 0.3 mm to 0.5 mm after rolling.
- care was taken so that the plate thickness was not uneven among the groups.
- the breaking rate of 200 coils was investigated in each group.
- the outside air temperature (the temperature inside the factory) was about 15°C.
- Table 1 shows the coils and conditions investigated.
- the steel plate temperature was measured using a thermometer installed at the entrance side of the rolling mill.
- the fracture rate of 200 coils with Si content of 2.0 mass% to 3.0 mass% is also 0%
- 200 coils with Si content of 3.0 mass% to 3.5 mass% width
- the fracture rate at the center (45°C, edge portion 60°C) was also 0%. It was confirmed that by heating the silicon steel sheet according to the present invention, breakage of the steel sheet can be greatly reduced.
- the fracture rate of 200 coils with Si content of 2.0 mass% to 3.0 mass% is also 0%
- 200 coils with Si content of 3.0 mass% to 3.5 mass% was also 0%. Focusing only on the fracture rate, the fracture can be suppressed until the Si content reaches 3.5 mass%, which is the same as in Invention Example 1, but the amount of energy used can be significantly reduced compared to Invention Example 1.
- the superiority of Invention Example 2 was confirmed. Therefore, it was confirmed that the closer the distance between the cold tandem rolling mill and the full-width heating device, the better, from the viewpoint of energy consumption reduction (environmental resistance).
- the rupture rate of 200 coils with a Si content of 1.0 mass% to 2.0 mass% is 0%, and the Si content of 200 coils with a Si content of 2.0 mass% to 3.0 mass%
- the fracture rate at (width center 25°C, edge portion 30°C) was also 0%.
- the rupture rate of 200 coils (width center 40° C., edge portion 50° C.) having a Si content of 3.0 mass % to 3.5 mass % was 1%.
- the rupture rate of 200 coils (width center 30° C., edge portion 40° C.) having a Si content of 3.0 mass % to 3.5 mass % was 1.5%. It was confirmed that when the steel plate temperature is lower than the steel plate temperature calculated from the above formulas (1) and (2), the higher the Si steel, the more likely it is to break.
- FIG. 3 An example of using a solenoid type full-width heating device is shown.
- a solenoid type full-width heating device cannot create a temperature gradient in the width direction of the steel plate.
- the temperature of the steel sheet heated by the solenoid type full-width heating device was calculated from the formula (1). In other words, the temperature required to suppress edge cracking cannot be ensured, and the steel sheet temperature at the edge tends to be lower than at the center in the width direction. It is relatively low temperature.
- the rupture rate of 200 coils (width center 17° C., edge portion 16° C.) having an Si content of 1.0 mass % to 2.0 mass % was 0%.
- the rupture rate of 200 coils width center 30° C., edge portion 25° C.
- Si content 2.0 mass% to 3.0 mass% is 0.5%
- the breaking rate of the coil was 2%.
- the rupture rate of 200 coils with a Si content of 1.0 mass% to 2.0 mass% is 0%, and the Si content of 200 coils with a Si content of 2.0 mass% to 3.0 mass% (width center 40 ° C., edge portion 35 ° C.) is 0%, and 200 coils with a Si content of 3.0 mass% to 3.5 mass% (width center 70 ° C., edge portion 60 ° C.) are also 0%. %Met.
- the central portion in the width direction of the steel sheet is heated more than necessary from the viewpoint of suppressing breakage, and it is preferable to reduce the input energy amount when considering the environmental load.
- % of 200 coils was 2%.
- rupture mode of the ruptured coil was investigated, it was found that rupture due to edge cracking could be suppressed, but rupture from the central portion in the width direction could not be suppressed.
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Abstract
Description
まず、図1を参照して、本発明の一実施形態である冷延鋼板の製造設備の構成について説明する。
次に、本発明の一実施形態である冷延鋼板の製造方法の特徴である、全幅加熱装置4による鋼板Sの加熱工程について説明する。なお、全幅加熱装置4は鋼板Sの上面及び下面の少なくとも一方を加熱するが、上面及び下面の両方を加熱することがより好ましい。
全幅加熱装置によって鋼板を加熱しない場合、つまり、圧延機入側の鋼板温度が15℃程度になる場合の例を示している。Si含有量が1.0mass%から2.0mass%の200コイルの破断率は0%であった。一方で、Si含有量が2.0mass%から3.0mass%の200コイルの破断率は1%、3.0mass%から3.5mass%の200コイルの破断率は3%であった。
上記数式(1),(2)より珪素鋼板のSi含有量に応じた冷間タンデム圧延機入側の鋼板温度を算出し、これに基づいて全幅加熱装置により鋼板を加熱した場合の例を示している。冷間タンデム圧延機と全幅加熱装置との間の距離は10mである。本発明例では、幅方向中央部の温度よりエッジ部の温度の方が高い。Si含有量が1.0mass%から2.0mass%の200コイル(幅中央17℃、エッジ部18℃)の破断率は0%であった。また、Si含有量が2.0mass%から3.0mass%の200コイル(幅中央30℃、エッジ部35℃)の破断率も0%、3.0mass%から3.5mass%の200コイル(幅中央45℃、エッジ部60℃)の破断率も0%であった。本発明に基づき珪素鋼板を加熱することで鋼板の破断を大幅に低減できることが確認された。
上記数式(1),(2)より珪素鋼板のSi含有量に応じた冷間タンデム圧延機入側の鋼板温度を算出し、これに基づいて全幅加熱装置により鋼板を加熱した場合の例を示している。冷間タンデム圧延機と全幅加熱装置との間の距離は1mである。つまり、発明例1と比較して、冷間タンデム圧延機と全幅加熱装置との間の距離が短くなっている。その他の条件は発明例1と同じである。本発明例では、Si含有量が1.0mass%から2.0mass%の200コイル(幅中央17℃、エッジ部18℃)の破断率は0%であった。また、Si含有量が2.0mass%から3.0mass%の200コイル(幅中央30℃、エッジ部35℃)の破断率も0%、3.0mass%から3.5mass%の200コイル(幅中央45℃、エッジ部60℃)の破断率も0%であった。破断率だけに着目すると、Si含有量が3.5mass%になるまで破断を抑制できており、発明例1と同じであるが、エネルギー使用量は発明例1と比較して大幅に低減できており、発明例2の優位性が確認できた。ゆえに、エネルギー使用量低減(耐環境性)の観点からは、冷間タンデム圧延機と全幅加熱装置との間の距離は近いほどよいということが確認できた。
上記数式(1),(2)より珪素鋼板のSi含有量に応じた圧延機入側の鋼板温度を算出し、これに基づいて全幅加熱装置により鋼板を加熱した場合の例を示している。冷間タンデム圧延機と全幅加熱装置との間の距離は20mである。つまり、発明例1の条件のうち、冷間タンデム圧延機と全幅加熱装置との間の距離を長くした例である。冷間タンデム圧延機と全幅加熱装置との間の距離が長いため、全幅加熱装置の能力の上限値まで使用しても数式(1),(2)より算出した圧延機入側の鋼板温度にすることができなかった。Si含有量が1.0mass%から2.0mass%の200コイル(幅中央15℃、エッジ部15℃)の破断率は0%、Si含有量が2.0mass%から3.0mass%の200コイル(幅中央25℃、エッジ部30℃)の破断率も0%であった。一方、Si含有量が3.0mass%から3.5mass%の200コイル(幅中央40℃、エッジ部50℃)の破断率は1%であった。冷間タンデム圧延機と全幅加熱装置との間の距離は短い方がよく、全幅加熱装置の能力の上限まで使用しても上記数式(1),(2)より算出される鋼板温度を確保できない距離に設置した場合、高Si鋼ほど破断が発生しやすくなることを確認できた。
上記数式(1),(2)より算出した珪素鋼板のSi含有量に応じた圧延機入側の鋼板温度よりも各々30%程度低温になるように全幅加熱装置により鋼板を加熱した場合の例を示している。その他の条件は発明例1と同じである。Si含有量が1.0mass%から2.0mass%の200コイル(幅中央15℃、エッジ部15℃)の破断率は0%、Si含有量が2.0mass%から3.0mass%の200コイル(幅中央20℃、エッジ部25℃)の破断率も0%であった。一方、Si含有量が3.0mass%から3.5mass%の200コイル(幅中央30℃、エッジ部40℃)の破断率は1.5%であった。上記数式(1),(2)より算出される鋼板温度より低温の場合、高Si鋼ほど破断が発生しやすくなることを確認できた。
ソレノイド式全幅加熱装置を用いた場合の例を示している。ソレノイド式全幅加熱装置では、鋼板の幅方向に温度勾配をつけることはできない。ソレノイド式全幅加熱装置により加熱する鋼板の温度は数式(1)より算出した。つまり、エッジ部割れの抑制に必要と考える温度は確保できず、さらに、エッジ部は幅方向中央部と比較して鋼板温度が低下しやすいため、エッジ部の温度は幅方向中央部の温度と比べて低温となっている。Si含有量が1.0mass%から2.0mass%の200コイル(幅中央17℃、エッジ部16℃)の破断率は0%であった。一方で、Si含有量が2.0mass%から3.0mass%の200コイル(幅中央30℃、エッジ部25℃)の破断率は0.5%、3.0mass%から3.5mass%の200コイル(幅中央45℃、エッジ部35℃)の破断率は2%であった。破断したコイルの破断形態を調査したところ、幅方向中央部からの破断は抑制できていたが、エッジ部割れによる破断を抑制できていなかった。
ソレノイド式全幅加熱装置を用いた場合の例を示している。ソレノイド式全幅加熱装置により加熱する鋼板の温度は数式(2)より算出した。つまり、エッジ部割れの抑制に必要だと考える温度にエッジ部の温度がなるように幅方向全域に亘って鋼板を加熱した。Si含有量が1.0mass%から2.0mass%の200コイル(幅中央20℃、エッジ部18℃)の破断率は0%、Si含有量が2.0mass%から3.0mass%の200コイル(幅中央40℃、エッジ部35℃)の破断率も0%、Si含有量が3.0mass%から3.5mass%の200コイル(幅中央70℃、エッジ部60℃)の破断率も0%であった。しかしながら、鋼板の幅方向中央部は破断抑制の観点からは必要以上に加熱されており、環境負荷を考えた際には投入エネルギー量を低減するとよい。
全幅加熱装置は使用せず、鋼板の幅方向両端部のみを加熱するエッジ部加熱装置を用いた場合の例を示している。エッジ部加熱装置により加熱する鋼板の幅方向両端部の温度は数式(2)より算出した。Si含有量が1.0mass%から2.0mass%の200コイル(幅中央15℃、エッジ部35℃)の破断率は0%であった。一方、Si含有量が2.0mass%から3.0mass%の200コイル(幅中央15℃、エッジ部35℃)の破断率は0.5%、Si含有量が3.0mass%から3.5mass%の200コイル(幅中央15℃、エッジ部60℃)の破断率は2%であった。破断したコイルの破断形態を調査したところ、エッジ部割れによる破断は抑制できていたが、幅方向中央部からの破断を抑制できていなかった。
2 接合装置
3 ルーパー
4 全幅加熱装置
5 温度計
6 冷間タンデム圧延機
7 切断機
8 テンションリール
S 鋼板
Claims (7)
- 鋼板の幅方向全域に亘って鋼板を加熱するトランスバース式全幅加熱装置と、前記トランスバース式全幅加熱装置に対して圧延方向下流側に配置された、前記鋼板を圧延する冷間圧延機と、を用いた冷延鋼板の製造方法であって、
前記冷間圧延機の入側において鋼板の幅方向中央部の温度よりも幅方向端部の温度が高くなるように、前記トランスバース式全幅加熱装置を用いて鋼板を加熱するステップを含む、冷延鋼板の製造方法。 - 前記冷間圧延機の入側における鋼板の幅方向中央部及び幅方向端部の温度が、鋼板のSi含有量に応じて変化する、請求項1に記載の冷延鋼板の製造方法。
- 鋼板の幅方向全域に亘って鋼板を加熱するトランスバース式全幅加熱装置と、
前記トランスバース式全幅加熱装置に対して圧延方向下流側に配置された、前記鋼板を圧延する冷間圧延機と、を備え、
前記トランスバース式全幅加熱装置は、前記冷間圧延機の入側において鋼板の幅方向中央部の温度よりも幅方向端部の温度が高くなるように、鋼板を加熱する、冷延鋼板の製造設備。 - 前記トランスバース式全幅加熱装置が、鋼板のSi含有量に応じて前記冷間圧延機の入側における鋼板の幅方向中央部及び幅方向端部の温度を変化させる、請求項4に記載の冷延鋼板の製造設備。
- 前記トランスバース式全幅加熱装置は、前記冷間圧延機の入側から10m以内の位置に設置されている、請求項4~6のうち、いずれか1項に記載の冷延鋼板の製造設備。
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