WO2023042794A1 - 焼入れ装置及び連続焼鈍設備、並びに焼入れ方法、鋼板の製造方法及びめっき鋼板の製造方法 - Google Patents
焼入れ装置及び連続焼鈍設備、並びに焼入れ方法、鋼板の製造方法及びめっき鋼板の製造方法 Download PDFInfo
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- WO2023042794A1 WO2023042794A1 PCT/JP2022/034060 JP2022034060W WO2023042794A1 WO 2023042794 A1 WO2023042794 A1 WO 2023042794A1 JP 2022034060 W JP2022034060 W JP 2022034060W WO 2023042794 A1 WO2023042794 A1 WO 2023042794A1
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- metal plate
- quenching
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- cooling
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- 238000010791 quenching Methods 0.000 title claims abstract description 147
- 230000000171 quenching effect Effects 0.000 title claims abstract description 146
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 47
- 239000010959 steel Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 238000000137 annealing Methods 0.000 title claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 186
- 229910052751 metal Inorganic materials 0.000 claims abstract description 186
- 238000001816 cooling Methods 0.000 claims abstract description 67
- 239000012809 cooling fluid Substances 0.000 claims abstract description 42
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 238000005246 galvanizing Methods 0.000 claims description 4
- 238000007747 plating Methods 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 16
- 239000002826 coolant Substances 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 239000003507 refrigerant Substances 0.000 description 8
- 229910001335 Galvanized steel Inorganic materials 0.000 description 5
- 239000008397 galvanized steel Substances 0.000 description 5
- 239000010960 cold rolled steel Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000010801 machine learning Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/63—Quenching devices for bath quenching
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
Definitions
- the present invention relates to a quenching apparatus and continuous annealing equipment for performing quenching while continuously passing a metal sheet, a quenching method, a steel sheet manufacturing method, and a plated steel sheet manufacturing method.
- the technology to rapidly cool the steel sheets is important.
- one of the fastest cooling techniques is water quenching.
- the steel sheet is quenched by immersing the heated steel sheet in water and simultaneously spraying cooling water onto the steel sheet from a quench nozzle provided in the water.
- a quench nozzle provided in the water.
- Patent Document 1 discloses a structure in which cooling water injection nozzles are installed in multiple stages in immersion water for water-cooling a heated strip, and each nozzle header is spaced apart from each other in the direction of strip travel. .
- cooling water injection nozzles are installed in multiple stages in immersion water for water-cooling a heated strip, and each nozzle header is spaced apart from each other in the direction of strip travel. .
- a bridle roll is used as a tension changing means capable of changing the tension of the steel plate subjected to the quenching process in order to suppress the wavy deformation of the metal plate that occurs during quenching in a continuous annealing furnace.
- a method of providing the front and back is disclosed.
- Patent Document 1 has a problem that the shape correction effect is insufficient when the metal plate has already warped before quenching.
- the method disclosed in Patent Document 2 since a large tension is applied to the high-temperature metal plate, there is a possibility that the metal plate may break.
- a large thermal crown occurs in the bridle roll before the quenching part that contacts the high-temperature metal plate, and the bridle roll and the metal plate contact unevenly in the width direction, resulting in buckling and scratches on the metal plate. is generated, there is a problem that the shape of the metal plate cannot be improved.
- An object of the present invention is to provide an annealing facility, a quenching method, a steel sheet manufacturing method, and a plated steel sheet manufacturing method.
- a quenching device for cooling a metal plate comprising a plurality of jet nozzles for jetting cooling fluid to the front and back surfaces of the metal plate, and based on the shape of the metal plate before quenching, the a flow regulating device for setting the flow rate of the cooling fluid jetted from the jet nozzle to the front and back surfaces of the metal plate, wherein the flow regulating device is configured so that the metal plate before quenching has a convex warp shape on the front side.
- the flow rate on the back surface side of the metal plate is set larger than that on the front surface side, and if the metal plate before quenching has a convex warp shape on the back surface side, the flow rate is set on the front surface side rather than the back surface side of the metal plate.
- a quenching device that sets a large flow rate of [2] The quenching apparatus according to [1], wherein the shape of the metal plate is measured by a shape measuring device that measures the shape of the metal plate before quenching. [3]
- the shape measuring device has a function of measuring the amount of warping of the metal plate, and the flow rate adjusting device increases the amount of cooling fluid injected to the surface of the metal plate as the amount of warping of the metal plate increases.
- the quenching apparatus wherein the flow rate difference between the flow rate and the flow rate of the cooling fluid jetted to the rear surface is set large.
- the flow rate difference between the flow rate of the cooling fluid injected to the surface of the metal plate and the flow rate of the cooling fluid injected to the back surface is 20 ⁇ d+200 (m 3 /hr), where d (mm) is the amount of warpage.
- the quenching apparatus which is less than [5]
- the shape measuring device comprises a shape measuring roll through which the metal plate before quenching passes, and the distance between the shape measuring device and the cooling start point of the cooling device is 0.5 m or more and 2.0 m or less.
- the quenching apparatus according to any one of [2] to [4].
- a quenching method for cooling a metal plate by injecting a cooling fluid from a plurality of jet nozzles onto the front and back surfaces of the metal plate, wherein the metal plate is quenched from the jet nozzles based on the shape of the metal plate before quenching.
- the flow rate of the cooling fluid to be injected to the front and back surfaces of the plate if the metal plate has a warped shape that is convex on the front surface side, the flow rate on the back surface side of the metal plate is set larger than that on the front surface side.
- a quenching method for increasing the flow rate on the front surface side of the metal plate than on the back surface side when the metal plate has a warped shape convex on the back surface side [8] Among the shapes of the metal plate, when grasping the warp amount of the metal plate and setting the flow rate of the cooling fluid, the greater the warp amount of the metal plate, the more the cooling fluid that is injected to the surface of the metal plate.
- the flow rate difference between the flow rate of the cooling fluid injected to the surface of the metal plate and the flow rate of the cooling fluid injected to the back surface is 20 ⁇ d+200 (m 3 /hr), where d (mm) is the amount of warpage.
- the quenching method according to [8], which is less than [10] A method for producing a steel plate, wherein the steel plate, which is the metal plate, is quenched by the quenching method according to any one of [7] to [9].
- [11] A method for producing a plated steel sheet, comprising plating the steel sheet produced by the method described in [10].
- the method for producing a plated steel sheet according to [11], wherein the plating treatment is any one of hot dip galvanizing treatment, electrogalvanizing treatment and alloyed hot dip galvanizing treatment.
- the flow rate of the cooling fluid jetted to the front and back surfaces is adjusted according to the shape of the metal plate.
- FIG. 1 is a schematic diagram showing an example of a hardening apparatus according to an embodiment of the present invention.
- the quenching apparatus 1 shown in FIG. 1 is for quenching a steel material, for example, as a metal sheet S, and is applied to a cooling facility provided on the delivery side of a soaking zone of a continuous annealing furnace.
- the hardening apparatus 1 of FIG. 1 includes a cooling device 10 that cools the metal plate S.
- the cooling device 10 cools a metal plate using a coolant CF, and is installed in a cooling bath 11 that stores the coolant CF, and is installed in the cooling bath 11 to inject the coolant CF onto the front and back surfaces of the metal plate S. and a plurality of ejection nozzles 12 .
- Water is stored in the cooling tank 11 as a coolant CF, and for example, the metal plate S is immersed from the upper surface of the cooling tank 11 in the direction of sheet feeding.
- the coolant CF in the cooling bath 11 is maintained at a water temperature suitable for quenching.
- the water temperature in the cooling bath 11 is preferably higher than 0°C and 50°C or lower, and particularly preferably 10°C or higher and 40°C or lower.
- a plurality of ejection nozzles 12 are installed along the direction in which the metal plate S is passed on each of the two surface sides of the metal plate. Therefore, the metal plate S is cooled by the coolant CF in the cooling tank 11 and the coolant CF ejected from the plurality of ejection nozzles 12 .
- the plurality of ejection nozzles 12 include a plurality of back ejection nozzles 12a that eject coolant from the back side of the metal plate S to the metal plate S for rapid cooling, and a plurality of back ejection nozzles 12a that jet the coolant CF from the front side of the metal plate S to the metal plate S.
- a plurality of front-side ejection nozzles 12b for rapid cooling are provided. The plurality of back side ejection nozzles 12a and the plurality of front side ejection nozzles 12b can independently adjust the flow rate of the coolant CF to be ejected.
- the back side jet nozzle 12a and the front side jet nozzle 12b are connected to a pipe (not shown), and the refrigerant CF in the cooling tank 11 is pumped into the pipe by a pump and pressure-fed to the back side jet nozzle 12a and the front side jet nozzle 12b. . Then, high-pressure water is jetted from the openings of the back side jetting nozzle 12a and the front side jetting nozzle 12b.
- the back ejection nozzles 12a and the front ejection nozzles 12b are desirably arranged symmetrically on the front side and the back side of the metal plate S, respectively, and slit nozzles are preferable in order to obtain a more uniform cooling capacity in the width direction.
- FIG. 1 illustrates a case where the cooling device 10 includes the cooling bath 11 and a plurality of ejection nozzles 12. However, if the cooling device 10 includes a plurality of ejection nozzles 12, the cooling bath 11 may be omitted. good too. Moreover, although the case of water quenching using water as the coolant CF is illustrated, oil cooling using oil as the coolant CF may be used.
- the fluid stored in the cooling bath 11 and ejected from the ejection nozzle 12 may be a cooling fluid, for example, the refrigerant CF.
- FIG. 1 illustrates a case in which a plurality of jet nozzles 12 are installed in the cooling bath 11, but if the method can cool the metal plate S within a desired temperature range, this cooling method can be used. Not limited.
- the cooling capacity for each of the front surface and the back surface of the metal plate S is set according to the shape of the metal plate S before quenching.
- the "shape" of the metal plate S includes “warp direction” and “warp amount”.
- the "warp direction” is the same as the "convex warp shape” in the metal plate S.
- the method for grasping the shape of the metal plate S before quenching is not particularly limited as long as the method can grasp the warp direction and warp amount of the metal plate S.
- the shape of the metal plate S before quenching is based on the shape measured at an arbitrary position on the passage of the metal plate S before quenching, and the annealing conditions of the metal plate S until just before quenching and the transport conditions of the metal plate S are added. may be calculated using a physical model.
- the shape of the metal plate S before quenching may be predicted using a prediction model using a machine learning model.
- a shape measuring device may be provided immediately before quenching to measure the shape of the metal plate S.
- the shape of the subsequent material before quenching may be estimated based on the "warp direction" and "warp amount” in the measurement of the shape of the metal plate S (preceding material) after quenching. Specifically, when the measured warpage amount of the metal plate S (previous material) after quenching is larger than the average value of the past production results (warpage amount after quenching), the warpage that existed before quenching has an effect. Then, the warp amount and warp direction of the metal plate S (subsequent material) before quenching may be estimated. Then, the flow rate of the estimated trailing material may be adjusted on the front surface and the back surface of the plurality of ejection nozzles 12 .
- the difference in the flow rate of the cooling fluid jetted from the back side ejection nozzle 12a and the front side ejection nozzle 12b is determined based on the warp amount, as described later. You just have to decide.
- the flow rate of the cooling fluid in the back ejection nozzle 12a and the front ejection nozzle 12b may be determined based on the data of the amount of warp (flattened shape) of the metal plate S after quenching corresponding to the difference.
- the warp direction of the metal sheet S before quenching tends to reflect the shape of the original sheet on the entrance side of the continuous annealing furnace. You may adjust the flow rate.
- the shape measuring device 20 comprises, for example, a shape measuring roll, and specifically, a product called BFI shape roll from Volmer can be used.
- a plurality of piezoelectric sensors are provided in the shape measuring device 20 along the width direction, and the shape of the metal plate S can be measured by passing the metal plate S over the shape measuring device 20 .
- the shape measuring device 20 measures the warp direction of the metal plate S before quenching as the shape of the metal plate S, and preferably measures the warp direction and the warp amount.
- the distance between the shape measuring device 20 and the cooling start point SP is preferably 0.5 m or more and 2.0 m or less. It is preferable to measure the shape at a place as close to the cooling start point as possible, but if it is less than 0.5m, there are concerns about interference with the cooling device and slippage of the shape measurement roll due to scattering of the cooling fluid. therefore undesirable. On the other hand, if the distance is more than 2.0 m, there is a high possibility that the warp will change between the measurement of the warp and the start of cooling, so it should be avoided.
- FIG. 1 exemplifies the case where the shape measuring device 20 consists of a shape measuring roll, but is not limited to this. may be measured.
- the distance between the shape measuring device 20 and the cooling start point SP is specifically the distance from the measurement point of the metal plate S in the shape measuring device to the cooling start point SP. Also when predicting the shape of the metal plate S, it is preferable to predict the shape of the metal plate S at a position as close as possible to the cooling start point SP.
- the flow rate adjusting device 30 sets the ejection amount of the coolant CF from the back side ejection nozzle 12a and the front side ejection nozzle 12b according to the shape of the metal plate S. As described above, when the flow rate of the cooling fluid ejected from the back side ejection nozzle 12a and the front side ejection nozzle 12b is controlled by the pump, the flow rate adjusting device 30 controls the flow rate of the cooling fluid by controlling the operation of the pump. .
- the injection amount of the refrigerant CF from the back side ejection nozzle 12a and the front side ejection nozzle 12b is preferably 200 m 3 /hr or more. This is because if the flow rate is less than 200 m 3 /hr, the vapor film generated on the surface of the metal plate S to be cooled cannot be sufficiently removed.
- the flow rate adjusting device 30 increases the flow rate of the back side ejection nozzle 12a of the metal plate S than the flow rate of the front side ejection nozzle 12b when the metal sheet S before quenching has a convex warped shape on the front side.
- the flow rate adjusting device 30 makes the flow rate of the front side ejection nozzle 12b larger than the flow rate on the back side of the metal plate.
- the cooling rate of the concave side of the warp is made higher than the convex side.
- the shape after quenching can be controlled to be flat. Therefore, after grasping the shape of the warp of the metal plate S, the warp can be improved by increasing the flow rate of the cooling fluid ejected from the nozzle installed on the concave side surface.
- FIG. 2 is a schematic diagram showing the definition of the amount of warpage d.
- the flow rate adjusting device 30 preferably reflects not only the warping direction but also the warping amount d in the injection amount of the refrigerant CF.
- the flow rate adjusting device 30 increases the flow rate difference between the flow rate of the cooling fluid jetted to the front surface of the metal plate S and the flow rate of the cooling fluid jetted to the back surface.
- the relationship between the warp amount d and the flow rate difference is set in advance in the flow rate adjusting device 30, and the refrigerant CF jetted from the back side jet nozzle 12a and the front side jet nozzle 12b according to the measured warp direction and warp amount d. is set.
- d (mm) is the amount of warpage that occurred before quenching
- Q (m 3 /hr) is the flow rate difference of the cooling fluid during cooling
- 0 ⁇ Q ⁇ 20d + 200 for the value of d is preferred.
- the flow rate difference Q is 20d+200 (m 3 /hr) or more, the sheet begins to warp in the opposite direction to the warp before cooling due to the difference in cooling capacity caused by the flow rate difference.
- the warp in advance is improved at 10 d (m 3 /hr), and in the case of a steel plate, the warp generated during cooling is about 10 mm. is preferably 0 ⁇ Q ⁇ 10d+100 (m 3 /hr).
- the quenching method and the steel plate manufacturing method of the present invention will be described with reference to FIG.
- the shape of the warp direction and warp amount d of the metal plate S before quenching is grasped.
- the flow rate adjusting device 30 the flow rates of the front side ejection nozzle 12b and the back side ejection nozzle 12a are set according to the shape of the metal plate S.
- the metal plate (steel plate) is cooled by the cooling device 10 while being conveyed, and the metal plate S is quenched.
- the flow rate of the back side ejection nozzle 12a is set larger than that of the front side ejection nozzle 12b, and the metal plate S before quenching is warped on the back side.
- the front ejection nozzle 12b is set larger than the flow rate of the back ejection nozzle 12a. Furthermore, this flow rate difference is set by the warp amount d.
- the shape of the metal plate S before quenching is grasped, and the flow rate of the cooling fluid jetted to the front surface and the back surface is set according to the shape of the metal plate S.
- the warping will become even greater after quenching.
- the bending moment that acts on the metal plate due to quenching acts in a direction that promotes the warp, if the metal plate is already warped before quenching, because there is resistance in the direction of restoring the warp. Therefore, the direction of warping of the metal plate before quenching is the same as the direction of warping of the metal plate after quenching, and the amount of warping is greater than before quenching.
- the present invention can reduce the complex and non-uniform uneven shape that occurs when the structure expands in volume due to martensitic transformation during rapid cooling of the metal sheet S. Therefore, when the metal plate S is a high-strength steel plate (high-tensile steel), the effect of suppressing deformation is increased.
- the hardening apparatus 1 is preferably applied to hardening when the metal plate S is a high-strength steel plate. More specifically, it is preferably applied to the production of steel sheets having a tensile strength of 580 MPa or more. Although the upper limit of the tensile strength is not particularly limited, it may be 2000 MPa or less as an example.
- high-strength steel sheets include high-strength cold-rolled steel sheets, hot-dip galvanized steel sheets (hot-dip galvanized steel sheets) obtained by subjecting them to surface treatment (plating), and electrogalvanized steel sheets (electro-galvanized steel sheets). steel sheet), alloyed hot-dip galvanized steel sheet (alloyed hot-dip galvanized steel sheet), etc.
- C is 0.04% or more and 0.35% or less
- Si is 0.01% or more and 2.50% or less
- Mn 0.80% or more and 3.70%.
- the embodiment of the present invention is not limited to the example of quenching a steel plate, and can be applied to the quenching of metal plates in general other than steel plates.
- Examples 1 to 14 of the present invention high-strength cold-rolled steel sheets having a thickness of 1.0 mm and a width of 1000 mm and a tensile strength of 1470 MPa class were produced as metal sheets S using the quenching apparatus 1 of FIG.
- the composition of the high-tensile cold-rolled steel sheet with a tensile strength of 1470 MPa is, in mass%, C 0.20%, Si 1.0%, Mn 2.3%, P 0.005%, S is 0.002%. Water was used as the coolant CF, and the temperature of the water was set at 30°C.
- Comparative Examples 1 to 6 the above-mentioned high-strength cold-rolled steel sheets were produced using the quenching apparatus shown in Patent Document 1 under the same conditions as in the Examples of the present invention. Then, for Inventive Examples 1 to 12 and Comparative Examples 1 to 6, the relationship between the warp amount of the metal plate S before quenching and the warp amount of the metal plate S after quenching was measured. For Inventive Examples 13 and 14, the "warp direction" and "warp amount” of the metal plate S before quenching were not measured, but the "warp direction” and "warp amount” before quenching were estimated. The definition of the amount of warpage is shown in FIG. It was determined that the warpage could be suppressed.
- Examples 13 and 14 of the present invention if the amount of warpage of the metal plate S (following material) after quenching is less than or equal to the amount of warpage of the metal sheet S (preceding material) after quenching, warping is suppressed. I decided it was done. Table 1 below shows the amount of warpage in Examples 1 to 14 of the present invention and Comparative Examples 1 to 6.
- Examples 1 to 14 of the present invention even when the metal plate S before quenching had already warped, warping of the metal plate S after quenching could be suppressed.
- Examples 2, 4, 6, 8, 10, and 12 of the present invention when the flow rate difference is provided according to not only the warp direction but also the warp amount d, the warp of the metal plate S before quenching is reduced by quenching. It was possible to make it 0 mm after putting it in.
- Comparative Examples 1 to 6 when the metal plate S before quenching had already warped, the warpage of the metal plate S after quenching increased.
- the shape of the metal plate S (following material) before quenching was estimated by visually confirming the direction and amount of warping of the metal plate S (preceding material) after quenching on the camera screen. bottom.
- the amount of warpage of the metal plate S (preceding material) after quenching is measured using an image taken from the edge side (both sides in the width direction) of the metal plate S, and the position where the amount of warpage is maximized. It was detected by image analysis and measured by fitting it to the actual scale. Then, when the measured warpage amount was larger than the average value of past production results (warpage amount after quenching), it was determined that the shape of the metal sheet S before quenching had warpage.
- the amount of warp before quenching was estimated from the difference between the average value of the past production results (the amount of warp after quenching) and the measured amount of warp. Therefore, the production results are collected in advance, and the correlation between the difference between the average value of the production results (warpage amount after quenching) and the measured warpage amount, and the warpage amount before quenching is grasped in advance. is preferred.
- the warp direction of the metal plate S (following material) was estimated based on the warp direction of the metal plate S (preceding material), assuming that the warping direction of the metal plate S before and after quenching is the same.
- the injection flow rate for the front surface and the back surface of the metal plate S (succeeding material) is adjusted. , it was confirmed that the amount of warpage after quenching could be improved in the succeeding material under the same conditions. In addition, in the same coil under the same manufacturing conditions, the amount of warpage before quenching does not vary significantly in the longitudinal direction. It has been confirmed that the amount of warpage after quenching can be improved by adjusting the injection flow rate for the front surface and the back surface of the metal plate S.
- Examples of the present invention include examples in which the amount of warpage after quenching is set to 0 mm. It is also possible to adjust the warp direction such as changing the warp direction to the other surface (back surface or front surface) when the width is narrow.
- Cooling Device 1 Quenching Device 10 Cooling Device 11 Cooling Tank 12 Ejection Nozzle 12a Back Side Ejection Nozzle 12b Front Side Ejection Nozzle 20 Shape Measuring Device 30 Flow Control Device CF Refrigerant S Metal Plate (Steel Plate) SP Cooling start point d Amount of warpage
Abstract
Description
[2]前記金属板の形状は、焼入れ前の前記金属板の形状を測定する形状測定装置によって測定される、[1]に記載の焼入れ装置。
[3]前記形状測定装置は、前記金属板の反り量を測定する機能を有し、前記流量調整装置は、前記金属板の反り量が大きくなるほど、前記金属板の表面へ噴射する冷却流体の流量と裏面へ噴射する冷却流体の流量との流量差を大きく設定する[2]に記載の焼入れ装置。
[4]前記金属板の表面へ噴射する冷却流体の流量と裏面へ噴射する冷却流体の流量との流量差は、反り量をd(mm)としたとき、20×d+200(m3/hr)未満である[3]に記載の焼入れ装置。
[5]前記形状測定装置は、焼入れ前の前記金属板が通る形状測定ロールからなり、前記形状測定装置と前記冷却装置による冷却開始点との距離は、0.5m以上2.0m以下である[2]~[4]のいずれか1つに記載の焼入れ装置。
[6][1]~[5]のいずれか1つに記載の焼入れ装置を均熱帯の出側に備える連続焼鈍設備。
[7]複数の噴出ノズルから金属板の表面および裏面に冷却流体を噴射して金属板を冷却する焼入れ方法であって、焼入れ前の前記金属板の形状に基づいて、前記噴出ノズルから前記金属板の表面及び裏面へ噴射する冷却流体の流量を設定する際、前記金属板が表面側に凸の反り形状である場合には前記金属板の表面側よりも裏面側の流量を大きくし、前記金属板が裏面側に凸の反り形状である場合には前記金属板の裏面側よりも表面側の流量を大きくする焼入れ方法。
[8]前記金属板の形状のうち、前記金属板の反り量を把握し、冷却流体の流量を設定する際、前記金属板の反り量が大きくなるほど、前記金属板の表面へ噴射する冷却流体の流量と裏面へ噴射する冷却流体の流量との流量差を大きくする[7]に記載の焼入れ方法。
[9]前記金属板の表面へ噴射する冷却流体の流量と裏面へ噴射する冷却流体の流量との流量差は、反り量をd(mm)としたとき、20×d+200(m3/hr)未満である[8]に記載の焼入れ方法。
[10][7]~[9]のいずれか1つに記載の焼入れ方法で前記金属板である鋼板の焼入れを行う鋼板の製造方法。
[11][10]に記載の方法で製造した鋼板にめっき処理を行うめっき鋼板の製造方法。
[12]前記めっき処理が、溶融亜鉛めっき処理、電気亜鉛めっき処理及び合金化溶融亜鉛めっき処理のいずれかである[11]に記載のめっき鋼板の製造方法。
10 冷却装置
11 冷却槽
12 噴出ノズル
12a 裏側噴出ノズル
12b 表側噴出ノズル
20 形状測定装置
30 流量調整装置
CF 冷媒
S 金属板(鋼板)
SP 冷却開始点
d 反り量
Claims (12)
- 金属板を冷却する焼入れ装置であって、
前記金属板の表面および裏面に冷却流体を噴射する複数の噴出ノズルを備える冷却装置と、
焼入れ前の前記金属板の形状に基づいて、前記噴出ノズルから前記金属板の表面及び裏面へ噴射する冷却流体の流量を設定する流量調整装置と、を有し、
前記流量調整装置は、焼入れ前の前記金属板が表面側に凸の反り形状である場合には前記金属板の表面側よりも裏面側の流量を大きく設定し、焼入れ前の前記金属板が裏面側に凸の反り形状である場合には前記金属板の裏面側よりも表面側の流量を大きく設定する、
焼入れ装置。 - 前記金属板の形状は、焼入れ前の前記金属板の形状を測定する形状測定装置によって測定される、請求項1に記載の焼入れ装置。
- 前記形状測定装置は、前記金属板の反り量を測定する機能を有し、
前記流量調整装置は、前記金属板の反り量が大きくなるほど、前記金属板の表面へ噴射する冷却流体の流量と裏面へ噴射する冷却流体の流量との流量差を大きく設定する請求項2に記載の焼入れ装置。 - 前記金属板の表面へ噴射する冷却流体の流量と裏面へ噴射する冷却流体の流量との流量差は、反り量をd(mm)としたとき、20×d+200(m3/hr)未満である請求項3に記載の焼入れ装置。
- 前記形状測定装置は、焼入れ前の前記金属板が通る形状測定ロールからなり、
前記形状測定装置と前記冷却装置による冷却開始点との距離は、0.5m以上2.0m以下である請求項2~4のいずれか1項に記載の焼入れ装置。 - 請求項1~5のいずれか1項に記載の焼入れ装置を均熱帯の出側に備える連続焼鈍設備。
- 複数の噴出ノズルから金属板の表面および裏面に冷却流体を噴射して金属板を冷却する焼入れ方法であって、
焼入れ前の前記金属板の形状に基づいて、前記噴出ノズルから前記金属板の表面及び裏面へ噴射する冷却流体の流量を設定する際、前記金属板が表面側に凸の反り形状である場合には前記金属板の表面側よりも裏面側の流量を大きくし、前記金属板が裏面側に凸の反り形状である場合には前記金属板の裏面側よりも表面側の流量を大きくする焼入れ方法。 - 前記金属板の形状のうち、前記金属板の反り量を把握し、
冷却流体の流量を設定する際、前記金属板の反り量が大きくなるほど、前記金属板の表面へ噴射する冷却流体の流量と裏面へ噴射する冷却流体の流量との流量差を大きくする請求項7に記載の焼入れ方法。 - 前記金属板の表面へ噴射する冷却流体の流量と裏面へ噴射する冷却流体の流量との流量差は、反り量をd(mm)としたとき、20×d+200(m3/hr)未満である請求項8に記載の焼入れ方法。
- 請求項7~9のいずれか1項に記載の焼入れ方法で前記金属板である鋼板の焼入れを行う鋼板の製造方法。
- 請求項10に記載の方法で製造した鋼板にめっき処理を行うめっき鋼板の製造方法。
- 前記めっき処理が、溶融亜鉛めっき処理、電気亜鉛めっき処理及び合金化溶融亜鉛めっき処理のいずれかである請求項11に記載のめっき鋼板の製造方法。
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JPS59153843A (ja) | 1983-02-18 | 1984-09-01 | Nippon Kokan Kk <Nkk> | ストリップの冷却装置 |
JPH0987752A (ja) * | 1995-09-25 | 1997-03-31 | Kawasaki Steel Corp | 鋼帯の冷却装置および鋼帯のカヌーイング抑制方法 |
JP2002226957A (ja) * | 2001-01-31 | 2002-08-14 | Furukawa Electric Co Ltd:The | アルミニウム合金ストリップの連続焼入れ方法 |
CN101928811A (zh) * | 2009-06-23 | 2010-12-29 | 宝山钢铁股份有限公司 | 一种基于模型控制的钢板淬火冷却方法 |
JP2011184773A (ja) | 2010-03-10 | 2011-09-22 | Kobe Steel Ltd | 連続焼鈍設備およびその設備における急冷焼入時の金属板の波状変形抑制方法 |
WO2020203261A1 (ja) * | 2019-03-29 | 2020-10-08 | Jfeスチール株式会社 | 焼入れ装置及び金属板の製造方法 |
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JPS59153843A (ja) | 1983-02-18 | 1984-09-01 | Nippon Kokan Kk <Nkk> | ストリップの冷却装置 |
JPH0987752A (ja) * | 1995-09-25 | 1997-03-31 | Kawasaki Steel Corp | 鋼帯の冷却装置および鋼帯のカヌーイング抑制方法 |
JP2002226957A (ja) * | 2001-01-31 | 2002-08-14 | Furukawa Electric Co Ltd:The | アルミニウム合金ストリップの連続焼入れ方法 |
CN101928811A (zh) * | 2009-06-23 | 2010-12-29 | 宝山钢铁股份有限公司 | 一种基于模型控制的钢板淬火冷却方法 |
JP2011184773A (ja) | 2010-03-10 | 2011-09-22 | Kobe Steel Ltd | 連続焼鈍設備およびその設備における急冷焼入時の金属板の波状変形抑制方法 |
WO2020203261A1 (ja) * | 2019-03-29 | 2020-10-08 | Jfeスチール株式会社 | 焼入れ装置及び金属板の製造方法 |
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