CN116745446A - Quenching device and quenching method for metal plate, and manufacturing method for steel plate - Google Patents
Quenching device and quenching method for metal plate, and manufacturing method for steel plate Download PDFInfo
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- CN116745446A CN116745446A CN202180091643.XA CN202180091643A CN116745446A CN 116745446 A CN116745446 A CN 116745446A CN 202180091643 A CN202180091643 A CN 202180091643A CN 116745446 A CN116745446 A CN 116745446A
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- metal plate
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- mist
- steel sheet
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- 239000002184 metal Substances 0.000 title claims abstract description 128
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 128
- 238000010791 quenching Methods 0.000 title claims abstract description 73
- 230000000171 quenching effect Effects 0.000 title claims abstract description 73
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 60
- 239000010959 steel Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 239000003595 mist Substances 0.000 claims abstract description 77
- 238000001816 cooling Methods 0.000 claims abstract description 73
- 239000012809 cooling fluid Substances 0.000 claims abstract description 14
- 238000000137 annealing Methods 0.000 claims abstract description 8
- 238000002791 soaking Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 50
- 229910000734 martensite Inorganic materials 0.000 claims description 22
- 230000009466 transformation Effects 0.000 claims description 21
- 239000010960 cold rolled steel Substances 0.000 claims description 9
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 6
- 239000008397 galvanized steel Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims 2
- 230000002950 deficient Effects 0.000 abstract description 2
- 239000007921 spray Substances 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 230000000452 restraining effect Effects 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 239000012530 fluid Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 229910000531 Co alloy Inorganic materials 0.000 description 1
- 241000669618 Nothes Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
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
- 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
-
- 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
- B21B45/02—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 lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
-
- 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
- C21D1/18—Hardening; Quenching with or without subsequent 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
- C21D1/26—Methods of annealing
-
- 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
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
-
- 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
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/613—Gases; Liquefied or solidified normally gaseous material
-
- 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
- C21D1/667—Quenching devices for spray 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- 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
- 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
- C21D9/5735—Details
- C21D9/5737—Rolls; Drums; Roll arrangements
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
-
- 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
Abstract
The invention provides a quenching device and a quenching method for a metal plate, which can inhibit defective shape generated in the metal plate during quenching, and a manufacturing method for a steel plate. A quenching apparatus for a metal sheet, which is provided on the output side of a soaking zone of a continuous annealing furnace, is provided with: a cooling fluid ejecting device having a plurality of ejecting nozzles for ejecting mist onto both surfaces of a metal plate to be continuously conveyed; and at least one pair of constraining rolls for constraining the metal plate from both sides in a region from a cooling start point to a cooling end point by the cooling fluid jet device.
Description
Technical Field
The present invention relates to a quenching apparatus and a quenching method for a metal sheet, which suppresses a shape defect generated in the metal sheet during quenching in a continuous annealing facility that continuously passes the metal sheet through and performs annealing, and a method for manufacturing a steel sheet.
Background
In the production of metal plates, typically steel plates, a continuous annealing facility heats the metal plates and then cools them, causing transformation and the like, thereby producing a material. In recent years, in the automotive industry, there has been an increasing demand for a high-strength steel sheet (high-tensile steel sheet) that is thinned for the purpose of achieving both weight saving and collision safety of a vehicle body. In the production of high-tensile steel sheets, a technique for rapidly cooling the steel sheets is important. In this cooling, a gas such as mist or hydrogen, in which a gas and water are mixed, is generally used as a cooling medium for the steel sheet. In this case, a problem arises in that a defective shape is caused by out-of-plane deformation such as warpage and wavy deformation in the steel sheet. In order to prevent such a shape failure at the time of quenching of the steel sheet, various methods have been proposed conventionally.
For example, patent document 1 discloses the following method: by properly controlling the water density of the mist sprayed to the strip, the metal strip is mist-cooled in a film boiling state without occurrence of migration boiling.
Patent document 2 discloses the following method: in a cooling region in a vertical continuous annealing furnace that continuously anneals a strip while conveying the strip in the vertical direction, occurrence of temperature unevenness in the width direction of the strip due to sagging or the like of water contained in mist sprayed to the strip on the surface of the strip is suppressed.
Patent document 3 discloses the following method: when the temperature of the Ms point at which the martensitic transformation of the metal plate starts is set to T Ms (DEGC) and setting the temperature of the Mf point at which the martensitic transformation is completed as T Mf At a temperature of (. Degree.C.) of the metal plate of (T Ms +150) (DEGC) to (T Mf -150) (°c), restraining the metal sheet in quenching by a pair of restraining rolls provided in the cooling liquid.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 2000-178658
Patent document 2: japanese patent laid-open No. 2009-127060
Patent document 3: japanese patent No. 6094722
Disclosure of Invention
Problems to be solved by the invention
However, as a result of verifying the methods described in patent document 1 and patent document 2, it is found that the shape defect suppressing effect is small only by controlling the water density and suppressing the temperature unevenness in the width direction.
Further, as a result of verifying the method described in patent document 3, the method of immersing the steel sheet in the liquid to cool is too strong, and therefore the cooling rate is liable to vary, and the steel sheet temperature at the time of passing the constraining rolls is liable to vary, and therefore, there is a case where a large variation in the warp amount occurs in the longitudinal direction, and there is room for improvement.
The present invention has been made to solve the above problems, and an object of the present invention is to provide a quenching apparatus and a quenching method for a metal plate, which can suppress a shape failure occurring in the metal plate during quenching, and a method for manufacturing a steel plate.
Means for solving the problems
The present inventors have repeatedly conducted intensive studies to solve such problems, and as a result, have found the following findings. In the method for producing a metal sheet, a microstructure control for causing a martensitic transformation of the metal sheet may be used at the time of quenching, but the microstructure may be expanded in volume at the time of the martensitic transformation, and thus may have a complicated and uneven shape. When a high-tensile steel sheet having a martensitic structure is quenched, the maximum stress acts on the steel sheet from the Ms point to the vicinity of the Mf point, where transformation expansion occurs during heat shrinkage, and the shape is destroyed. In this case, the cooling speed is more likely to vary as the cooling is more intense. Therefore, by arranging the constraining rolls for constraining the metal plate in the range from the Ms point to the Mf point in the metal plate temperature in addition to cooling with mist that does not cool too strongly, the warpage amount can be sufficiently reduced. Here, the Ms point refers to the temperature at which the martensitic transformation starts, and the Mf point refers to the temperature at which the martensitic transformation ends.
The present invention has been completed based on the above-described findings and ideas, and has the following features.
[1] A quenching apparatus for a metal sheet, which is provided on the output side of a soaking zone of a continuous annealing furnace, is provided with: a cooling fluid ejecting device having a plurality of ejecting nozzles for ejecting mist onto both surfaces of a metal plate to be continuously conveyed; and at least one pair of constraining rolls for constraining the metal plate from both sides in a region from a cooling start point to a cooling end point by the cooling fluid jet device.
[2] The quenching apparatus for a metal sheet according to [1], wherein the plurality of spray nozzles are arranged to spray the mist onto the metal sheet over a temperature range from a martensitic transformation start temperature to a martensitic transformation end temperature of the metal sheet.
[3] The quenching apparatus for a metal sheet according to [1] or [2], wherein a water removal nozzle is provided downstream of an outlet portion of the cooling fluid injection apparatus.
[4] A quenching method for a metal sheet, wherein mist is sprayed onto both surfaces of a continuously conveyed metal sheet to cool the metal sheet, and the metal sheet is restrained from both surfaces in a region between at least a martensitic transformation start temperature and a martensitic transformation end temperature during the cooling.
[5]According to [4]]In the method for quenching a metal sheet, the water density of the mist is set to 100L/m 2 Min above and 800L/m 2 Min or less.
[6] A method for producing a steel sheet, wherein the steel sheet is continuously annealed and further quenched by the quenching method for a metal sheet according to [4] or [5], whereby any one of a high-strength cold-rolled steel sheet, a hot-dip galvanized steel sheet, an electrogalvanized steel sheet and an alloyed hot-dip galvanized steel sheet is produced.
Effects of the invention
According to the quenching apparatus and the quenching method for a metal plate and the manufacturing method for a steel plate of the present invention, it is possible to effectively suppress shape defects generated in the metal plate during quenching.
Drawings
Fig. 1 is a view showing an example of a quenching apparatus and a quenching method for a metal plate according to the present invention.
Fig. 2 is a view showing an example of a supply system for supplying air and water to the mist spray nozzle in the quenching apparatus for a metal sheet according to the present invention.
Fig. 3 is a view showing an example of a two-fluid nozzle.
Fig. 4 (a) and 4 (b) are diagrams showing examples of the mist discharge nozzle.
Fig. 5 (a) and 5 (b) are diagrams showing mist cooling and conventional water quenching by the quenching apparatus and the quenching method of the metal sheet according to the present invention.
Fig. 6 is a view showing another example of the quenching apparatus and quenching method for a metal plate according to the present invention.
Fig. 7 is a graph showing the effect of the quenching apparatus and quenching method for a metal sheet according to the present invention compared with that of the comparative example.
Fig. 8 is a diagram showing the definition of the warp amount of the metal plate in fig. 7.
Detailed Description
Hereinafter, embodiments of a quenching apparatus for a metal plate, a quenching method for a metal plate, and a manufacturing method for a steel plate according to the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a view showing a quenching apparatus for a metal sheet according to an embodiment of the present invention. The quenching device is suitable for cooling equipment arranged on the output side of the soaking belt of the continuous annealing furnace. The cooling device is provided for obtaining mechanical properties of a final product by causing martensite transformation of an austenite phase during cooling of a steel plate when the metal plate to be cooled is the steel plate. Therefore, the cooling device has the capability of cooling a range including a temperature range from the martensitic transformation start temperature to the martensitic transformation end temperature.
As shown in fig. 1, the quenching apparatus for a metal plate according to the present embodiment includes: a cooling fluid ejecting apparatus constituted by a plurality of mist ejecting nozzles (ejecting nozzles) 2, at least one pair of constraining rolls 3 that constrain the metal plate 1 in a cooling region of the cooling fluid ejecting apparatus, and a water removing ejecting nozzle 4. The mist discharge nozzle 2 discharges mist 2a as a refrigerant (cooling fluid) from both sides of a continuously passing metal plate (for example, steel plate) 1 to the metal plate 1, and rapidly cools the metal plate. The constraining rolls 3 constrain the metal plate 1 from the cooling start point of the inlet portion of the cooling fluid ejection device to the cooling end point of the outlet portion, thereby preventing deformation. The water removal nozzle 4 is provided downstream of the outlet portion of the cooling fluid injection device, and injects a gas 4a such as air or nitrogen from the output side of the metal plate 1 to discharge the drip water from the metal plate 1.
Here, mist means mist-like water or liquid, and means water or liquid in a state where fine droplets having a droplet diameter of about 0.01 μm to several hundreds μm float in a gas. In the present embodiment, the mist is generated by mixing and spraying water and air. The metal plate to be cooled can be sufficiently cooled by blowing air while attaching water in the form of minute droplets. In addition, since the water and the air reach the metal plate in a mixed state, the cooling rate can be made gentle and stable as compared with the case of spraying only the water.
When the droplet diameter of the mist is smaller than 10. Mu.m, the water droplets are liable to evaporate, and a sufficient cooling rate may not be obtained. In addition, if the droplet diameter of the mist exceeds 100 μm, water in the form of water droplets may adhere to and remain on the metal plate, and uneven cooling may easily occur. Therefore, the droplet diameter of the mist is preferably 10 μm or more and 100 μm or less.
The mist discharge nozzle 2 may be, for example, a slit nozzle PSN manufactured in a pool of corporation, a knife jet KJIS (internal mixing) manufactured by co-alloy manufacturing of corporation, or the like.
Fig. 2 schematically shows a supply system for supplying air and water to the mist spray nozzle 2 in the quenching apparatus for a metal sheet according to the present embodiment. Fig. 3 schematically shows a two-fluid nozzle used as the mist discharge nozzle 2 in the present embodiment. In the present embodiment, the case where the two-fluid nozzle shown in fig. 3 is used to generate the mist is described as an example of the mist discharge nozzle 2, but the mist discharge nozzle is not limited to this, and the mist can be discharged in an appropriate flow rate range.
In the case of using a two-fluid nozzle as the mist discharge nozzle 2, as shown in fig. 2, compressed air pressure-fed from the compressor 52 is supplied to the mist discharge nozzle 2 through the compressed air pipe 5. The water pumped from the water tank 62 by the pump 63 is supplied to the mist discharge nozzle 2 through the water pipe 6. Here, the opening degrees of the supply valve 51 provided in the compressed air pipe 5 and the supply valve 61 provided in the water pipe 6, and the operation of the pump 63 are controlled by the flow rate control device 7. In this way, the compressed air and water may be supplied so that the pressure and the amount of the compressed air and water supplied to the mist outlet nozzle 2 are within the allowable ranges of the specification of the mist outlet nozzle 2. In order to avoid clogging of the mist discharge nozzle 2, a filter may be provided closer to the mist discharge nozzle 2 than the supply valve 61 of the water pipe 6.
Here, when the gas-water volume ratio of the mist sprayed from the mist spray nozzle 2 is less than 50, adhesion and residue of water to the metal plate 1 become remarkable, and uneven cooling is likely to occur. If the gas-water volume ratio exceeds 1000, the droplet diameter of the mist may become too small, and the cooling rate required for obtaining the characteristics required for the metal plate 1 may not be obtained. Therefore, the gas-water volume ratio of the mist sprayed from the mist spray nozzle 2 is preferably set to 50 to 1000.
In the quenching apparatus for a metal sheet according to the present embodiment, 80 rows of mist spray nozzles 2 are arranged at 200mm intervals in the steel sheet traveling direction (steel sheet longitudinal direction).
However, the arrangement of the mist discharge nozzles 2 is not limited to this, and may be arranged so that no uneven cooling occurs in the width direction of the metal plate 1. For example, as shown in fig. 4 (a), when a slit nozzle 2A wider than the width of the metal plate 1 is used as the mist discharge nozzle 2, the slit nozzle is preferably arranged so that the nozzle interval I in the steel plate traveling direction is 100 to 600mm. This is because, when the nozzle interval I in the steel sheet traveling direction is less than 100mm, the mist spray areas of the nozzles interfere with each other, and it is difficult to predict the cooling rate, and when the nozzle interval I in the steel sheet traveling direction exceeds 600mm, a sufficient cooling rate may not be obtained.
In addition, as shown in fig. 4 (B), when a nozzle 2B having a dot shape or a conical shape is used as the mist discharge nozzle 2, it is preferable to arrange a plurality of nozzles 2B in the width direction of the metal plate 1 according to the specification of the nozzle. At this time, it is preferable that the mist spray areas of the respective nozzles 2B be made to overlap sufficiently or without gaps so as to obtain a uniform cooling rate in the width direction of the metal plate 1. As shown in fig. 4 (B), a plurality of nozzles 2B aligned in the width direction of the metal plate 1 are preferably attached to the header 21 for use.
The mist discharge nozzles 2 may be arranged in a staggered manner, or the inclination angle of the mist discharge nozzle 2 with respect to the metal plate 1 and the spreading angle of the mist spreading in a conical shape may be adjusted according to the width of the metal plate 1 to be cooled.
In this way, in the case where a plurality of nozzles arranged in the width direction of the metal plate 1 are used as the nozzle groups in order to obtain uniform cooling capacity in the width direction of the metal plate 1, it is preferable that the interval I between the nozzle groups in the steel plate traveling direction is set to 100 to 600mm. This is because, when the interval I between nozzle groups in the steel sheet traveling direction is less than 100mm, the mist spray areas of the nozzles interfere with each other, making it difficult to predict the cooling rate, and when the interval I between nozzle groups exceeds 600mm, a sufficient cooling rate may not be obtained.
Here, in the present invention, it is important to restrain the metal plate 1 with the restraint roller 3 in a temperature zone where the shape of the metal plate 1 is most disturbed, according to the positional relationship between the cooling capacity of the cooling fluid ejection device (mist ejection nozzle) 2 and the restraint roller 3. Therefore, in the quenching apparatus and the quenching method for a metal sheet according to the present embodiment, it is preferable to set the mist amount and the mist water temperature for controlling the cooling capacity as follows.
First, in the case of performing a quenching method in which cooling is performed by spraying mist 2a from a plurality of mist spray nozzles 2 onto the surface of metal plate 1, it is preferable that the water density of mist 2a is set to 100L/m 2 Min above and 800L/m 2 Min or less. When the water density of the mist 2a is less than 100L/m 2 At min, there is noThe method gives the steel sheet mechanical properties, and the position of the constraining rolls from the cooling start position becomes long distance, leading to an increase in the size of the equipment. In addition, when the water density of the mist 2a exceeds 800L/m 2 At min, the cooling time from the start of cooling to the arrival of the constraining rolls is short, and the cooling is unstable, and the shape may be disturbed to such an extent that the constraining rolls cannot be straightened.
Further, the water density of the mist 2a is more preferably 200L/m 2 500L/m of min or more 2 Min or less.
The temperature of the cooling water constituting the particles of the mist 2a is preferably more than 0 ℃ and 60 ℃ or less, and particularly preferably 10 ℃ or more and 50 ℃ or less, from the viewpoint of maintaining the equipment and obtaining a sufficient cooling rate. If the temperature is equal to or lower than 0 ℃, the equipment may be damaged by freezing, and if the temperature is higher than 60 ℃, the cooling rate becomes low, and the position of the constraining roll from the cooling start position becomes long-distance, which leads to an increase in the size of the equipment.
In the vertical mist cooling device, since water contained in the mist 2a falls downward along the metal plate 1 to adversely affect cooling of the lower portion, it is preferable to perform a countermeasure against dripping in advance, and for example, the mist 2a and the gas 4a can be controlled by being sprayed upward at about 30 degrees.
In this case, for the above reasons, in order to arrange a practical and effective constraining roll according to the cooling capacity, the cooling rate of the metal plate 1 is preferably set to 50 ℃/sec or more and 500 ℃/sec or less. When the cooling speed is less than 50 ℃/sec, the distance from the cooling start point to the constraining rolls becomes long, resulting in an increase in the size of the apparatus. On the other hand, if the cooling time exceeds 500 ℃/sec, the cooling time from the start of cooling to the constraining rolls becomes short, and the cooling becomes unstable, and the shape may be disturbed to such an extent that the constraining rolls cannot be used for straightening.
By controlling the mist 2a to be in an appropriate cooling rate range in this way, the shape correction effect by the constraining rolls 3 can be improved.
In the present embodiment, in the quenching method in which mist 2a is sprayed from the plurality of mist spray nozzles 2 onto the surface of the metal plate 1 to cool the metal plate 1, the constraining rolls 3 for constraining the metal plate 1 are disposed in a range from the Ms point to the Mf point of the temperature of the metal plate 1. Here, the Ms point is the temperature at which the martensitic transformation of the metal plate 1 starts, and the Mf point is the temperature at which the martensitic transformation ends. The temperatures of the Ms point and the Mf point can be calculated from the composition of the metal plate 1.
In order to prevent deformation that may occur during quenching of the metal plate 1, the constraining rolls 3 sandwich the metal plate 1 from the front and rear surfaces. The pair of constraining rolls 3 are preferably arranged with their central axes shifted in the conveying direction of the metal plate 1. By arranging the central axes in a staggered manner, the restraining force of the metal plate 1 can be increased, and the shape correcting force can be improved. As an example, the constraining rolls 3 are preferably arranged with their central axes shifted from 40mm to 150mm, more preferably from 80mm to 100mm, in the conveying direction.
Further, the metal plate 1 is preferably pressed by the constraining rolls 3, so that the metal plate 1 is wound around the constraining rolls 3. By pressing the metal plate 1, the straightening force of the steel plate can be improved, and the free running of the constraining rolls 3 can be prevented. When the metal plate 1 passes straight as shown in fig. 1, the amount of press-fitting of the 1 constraining rolls 3 is preferably 0mm or more and 2.5mm or less, more preferably 0.5mm or more and 1.0mm or less, based on the standard (0 mm).
Fig. 5 (a) and 5 (b) show a comparison of mist cooling of the quenching apparatus and quenching method of the metal sheet according to the present embodiment with conventional water quenching. As shown in fig. 5 (a), the cooling from the Ms point to the Mf point is gradually performed by mist cooling, and the distance L from the Ms point to the Mf point is longer than that of the conventional water quenching shown in fig. 5 (b). Therefore, it is easy to flexibly cope with the change of the sheet passing speed and the sheet thickness of the metal sheet 1, to use the constraining rolls 3 in an appropriate temperature range, or to increase or decrease the number of constraining rolls 3 for constraining, as compared with the conventional water quenching.
For example, when considering that the plate thickness x the plate passing speed is 1.5 (m/sec). Mm, and the temperature difference between the Ms point and the Mf point is 100 ℃, in the water quenching shown in fig. 5 (b), if the cooling rate is 1500 ℃/(sec. Mm), the distance L from the Ms point to the Mf point becomes 100mm. On the other hand, in the mist cooling shown in fig. 5 (a), the cooling rate is about 300 ℃/(sec·mm), and the distance L from the Ms point to the Mf point can be increased to 500mm. Further, by providing the plurality of constraining rolls 3 in the interval of the distance L (500 mm) from the Ms point to the Mf point, the metal plate 1 can be reliably constrained in the temperature interval from the Ms point to the Mf point, and shape correction can be reliably performed. Further, it is easy to flexibly cope with a fluctuation of a non-fixed constraint position such as a change in the sheet passing speed or the sheet thickness.
Here, in the quenching apparatus and the quenching method for a metal sheet according to the present embodiment shown in fig. 5 (a), when the distance L from the Ms point to the Mf point is less than 200mm, it is difficult to flexibly cope with the change in the sheet passing speed and the sheet thickness of the metal sheet 1, as in the case of water quenching shown in fig. 5 (b). Therefore, the shape correction effect by the constraining rolls 3 may not be sufficiently obtained. If the distance L from the Ms point to the Mf point exceeds 1000mm, the martensitic transformation may be insufficient, and desired material properties may not be obtained. Therefore, in order to effectively obtain the shape correction effect by the constraining rolls 3 in the region from the Ms point to the Mf point, it is preferable to ensure that the distance L from the Ms point to the Mf point is about 200 to 1000 mm.
The mist 2a may be used over the entire length of the region of the metal plate 1 that needs to be cooled, including the high temperature side of the Ms point and the low temperature side of the Mf point.
In order to prevent occurrence of a roller flaw in the metal plate 1, the constraining roller 3 is preferably rotated in the circumferential direction by an electric motor. In order to adjust the straightening force of the metal plate 1, the constraining rolls 3 are preferably openable and closable (the amount of press-fitting into the metal plate 1 can be controlled) as needed.
The constraining rolls 3 may be formed of a material having excellent thermal conductivity and strength capable of receiving the load of the metal plate 1 during the sandwiching. As a material of the constraining rolls 3, for example, SUS304 or SUS310, or ceramics, etc. specified in japanese industrial standard JISG4304 "hot rolled stainless steel sheet and steel strip", are cited.
Next, an example using 3 or more constraining rolls 3 will be described with reference to fig. 6. Hereinafter, the same points as in the case of using the pair of constraining rolls 3 may be omitted.
In the example of fig. 6, the front and rear surfaces of the metal plate 1 are restrained by 4 (two pairs of) restraining rolls 3. In the case of providing a plurality of pairs of constraining rolls, the metal plate 1 is preferably rolled by the constraining rolls for the same reason as in the case of providing only 2 (1 pair) constraining rolls. The pressing amount of each constraining roll is preferably 0mm or more and 2.5mm or less, and particularly preferably 0.5mm or more and 1.0mm or less. The number of the constraining rolls 3 disposed on the front and rear surfaces of the metal plate 1 may not be the same. However, in order to apply the restraining force equally from both sides of the metal plate 1, it is preferable that the same number of restraining rollers 3 be arranged in pairs on the front and rear surfaces of the metal plate 1, or that the difference in the number of restraining rollers 3 arranged on the front and rear surfaces of the metal plate 1 be made one.
In the case where 3 or more constraining rolls are provided, the shape correcting force of the steel sheet at the time of cooling can be further improved as compared with the case where only 2 (1 pair) constraining rolls are provided. In particular, even in the case of cooling a high-strength steel sheet that is likely to cause deformation, by providing 3 or more constraining rolls, deformation such as warping of the steel sheet during cooling can be further suppressed. On the other hand, when the number of the constraining rolls is excessively increased, there are also problems in terms of equipment constraints and in terms of a decrease in cooling capacity in the ejection device, and therefore, the number of the constraining rolls may be appropriately determined in consideration of these problems.
Further, as in the present embodiment, when the cooling by the mist 2a and the constraining rolls 3 are used together, the mist 2a may adhere to and remain on the constraining rolls 3, and the adhesion and retention of the droplets may become uneven in the width direction of the metal plate 1 (i.e., the axial direction of the constraining rolls 3). As a result, uneven cooling may occur, and the shape correction effect of the constraining rolls 3 may be reduced. Therefore, in order to solve such a problem, a water removal mechanism (not shown) for removing the liquid droplets adhering to and remaining on the constraining rolls 3 may be provided in the vicinity of the constraining rolls 3. Specifically, as the water removal mechanism, an obstacle on a squeegee, a wiper, an air nozzle, or the like can be used.
As described above, the present invention is intended to reduce the complex and uneven shape that occurs when martensitic transformation occurs and the structure volume expands in quenching of a steel sheet, and is preferably applied to a method for producing a high-strength steel sheet (high-tensile steel sheet).
More specifically, the method is preferably applied to the production of a steel sheet having a tensile strength of 580MPa or more. The upper limit of the tensile strength is not particularly limited, and may be 1600MPa or less, for example.
Examples of the high-strength steel sheet (high-tensile steel sheet) include a high-strength cold-rolled steel sheet, a hot-dip galvanized steel sheet, an electrogalvanized steel sheet, and an alloyed hot-dip galvanized steel sheet, each of which has been subjected to a surface treatment.
Specific examples of the composition of the high-strength steel sheet include the following: in mass%, C is 0.04% or more and 0.25% or less, si is 0.01% or more and 2.50% or less, mn is 0.80% or more and 3.70% or less, P is 0.001% or more and 0.090% or less, S is 0.0001% or more and 0.0050% or less, sol.Al is 0.005% or more and 0.065% or less, at least 1 or more of Cr, mo, nb, V, ni, cu and Ti is 0.5% or less, respectively, if necessary, B, sb is 0.01% or less, and the balance is Fe and unavoidable impurities.
The embodiment of the present invention is not limited to the example of quenching the steel sheet, and may be applied to quenching of all metal sheets other than the steel sheet.
Examples
The quenching apparatus and quenching method for a metal sheet and the method for manufacturing a steel sheet according to the present invention are applied to a steel sheet manufacturing test, and the effect thereof is verified.
(inventive example 1)
By using the quenching apparatus for a metal sheet shown in FIG. 1, the water density of mist was 400L/m at a sheet passing speed of 1.0m/s, a quenching start temperature of 800 ℃ 2 A high-tensile cold-rolled steel sheet having a sheet thickness of 1.0mm and a sheet width of 1000mm and a tensile strength of 1470MPa grade was produced at a temperature of 350℃at min at which the constraining rolls passed.
Here, as the composition of the high-tensile cold-rolled steel sheet having a tensile strength of 1470MPa level, C was 0.20% by mass, si was 1.0% by mass, mn was 2.3% by mass, P was 0.005% by mass, and S was 0.002% by mass.
The temperature of the Ms point of the high-tension cold-rolled steel sheet was 400℃and the temperature of the Mf point was 300 ℃. Therefore, as described above, the temperature at which the constraining rolls pass may be set in the range of 400 to 300 ℃, and thus, here, the temperature is set to 350 ℃ as described above.
Here, the center axes of the constraining rolls are arranged to be shifted by 80mm in the sheet passing direction, and the amount of press-fitting of the constraining rolls 3 into the metal plate 1 is set to 0.5mm in total.
(inventive example 2)
The quenching apparatus shown in FIG. 6 was used, and the operation was performed under the same conditions as in inventive example 1. The center axes of the opposed constraining rolls were all arranged so as to be offset by 80mm in the sheet passing direction, and the amount of press-fitting of the constraining rolls 3 into the metal plate 1 was all 0.5mm.
Comparative example 1
As a comparative example, the above-described high-tensile cold-rolled steel sheet was produced using the cooling apparatus shown in patent document 1 under the same conditions as in the present invention example.
Comparative example 2
As a comparative example, the above-described high-tensile cold-rolled steel sheet was produced using a cooling apparatus shown in patent document 2 under the same conditions as in the present invention example.
Comparative example 3
As a comparative example, the above-described high-tensile cold-rolled steel sheet was produced using a cooling apparatus shown in patent document 3 under the same conditions as in the present invention example.
Then, for each case (inventive examples 1 to 2 and comparative examples 1 to 3), 10 cooled steel sheets were cut every 100m in the longitudinal direction, and the warpage amounts of the respective steel sheets were examined. The definition of the warpage amount is shown in fig. 8. Specifically, the height of the highest position in the case where the steel sheet is placed on the horizontal plane is taken as the warpage amount.
The results of examples 1 to 2 of the present invention and those of comparative examples 1 to 3 are shown in FIG. 7.
In the present invention examples 1 and 2, the warpage of the steel sheet was reduced to a range of 2.0 to 8.0mm, and the entire longitudinal area was suppressed to 10mm or less. In contrast, in comparative examples 1 and 2, the warpage amount of the steel sheet was distributed in the range of 10.0mm to 14.0mm, and the deformation inhibiting effect was insufficient in the entire longitudinal direction. In comparative example 3, the warpage amount of the steel sheet was varied in the range of 4.0 to 14.0mm, and the warpage amount was not controlled in the range of 10mm or less in the entire longitudinal direction.
Thus, the effectiveness of the quenching apparatus and quenching method for a metal sheet and the manufacturing method for a steel sheet of the present invention was confirmed.
Description of the reference numerals
1 Metal plate
2 (2A, 2B) mist spray nozzle (spray nozzle)
2a fog
21. Header pipe
3. Restraining roller
4. Dewatering jet nozzle
4a gas
5. Compressed air piping
51. Supply valve
52. Compressor with a compressor body having a rotor with a rotor shaft
6. Water piping
61. Supply valve
62. Water tank
63. Pump with a pump body
7. A flow control device.
Claims (6)
1. A quenching device for a metal plate,
the output side of the soaking belt arranged on the continuous annealing furnace is provided with:
a cooling fluid ejecting device having a plurality of ejecting nozzles for ejecting mist onto both surfaces of a metal plate to be continuously conveyed; and
at least one pair of constraining rolls constrains the metal plate from both sides in a region from a cooling start point to a cooling end point by the cooling fluid ejecting device.
2. The quenching apparatus for a metal sheet according to claim 1,
the plurality of ejection nozzles are arranged to eject the mist to the metal plate over a temperature range from a martensitic transformation start temperature to a martensitic transformation end temperature of the metal plate.
3. A quenching apparatus for a metal sheet according to claim 1 or 2,
a water removal nozzle is provided downstream of the outlet portion of the cooling fluid injection device.
4. A method for quenching a metal sheet,
the cooling is performed by spraying mist onto both surfaces of a continuously conveyed metal plate, and the metal plate is restrained from both surfaces in a region where the temperature of the metal plate during the cooling is at least between the martensite phase transition start temperature and the martensite phase transition end temperature.
5. The quenching method of a metal sheet according to claim 4,
setting the water density of the mist to 100L/m 2 Min above and 800L/m 2 Min or less.
6. A method for manufacturing a steel sheet, which comprises the steps of,
the steel sheet is continuously annealed and further quenched by the quenching method for a metal sheet according to claim 4 or 5, thereby producing any one of a high-strength cold-rolled steel sheet, a hot-dip galvanized steel sheet, an electrogalvanized steel sheet, and an alloyed hot-dip galvanized steel sheet.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021-012721 | 2021-01-29 | ||
| JP2021012721 | 2021-01-29 | ||
| PCT/JP2021/039666 WO2022163044A1 (en) | 2021-01-29 | 2021-10-27 | Metal sheet quench-hardening apparatus and quench-hardening method, and steel sheet production method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116745446A true CN116745446A (en) | 2023-09-12 |
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| CN202180091643.XA Pending CN116745446A (en) | 2021-01-29 | 2021-10-27 | Quenching device and quenching method for metal plate, and manufacturing method for steel plate |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP4257709A4 (en) |
| JP (1) | JP7338783B2 (en) |
| KR (1) | KR20230122656A (en) |
| CN (1) | CN116745446A (en) |
| MX (1) | MX2023008750A (en) |
| WO (1) | WO2022163044A1 (en) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5846116Y2 (en) * | 1979-12-20 | 1983-10-20 | 川崎製鉄株式会社 | Rapid cooling device for continuous annealing equipment |
| FR2571384A1 (en) * | 1984-10-09 | 1986-04-11 | Bertin & Cie | PROCESS OF HARDENING HARDWARE OF METAL SHEETS SUCH AS STEEL AND INSTALLATION FOR IMPLEMENTING SAME |
| JP4109365B2 (en) | 1998-12-08 | 2008-07-02 | 新日本製鐵株式会社 | Metal strip cooling method |
| JP5097394B2 (en) * | 2006-12-19 | 2012-12-12 | 住友金属工業株式会社 | Cold rolled steel sheet manufacturing method and manufacturing apparatus |
| JP5100327B2 (en) | 2007-11-20 | 2012-12-19 | 住友金属工業株式会社 | Cold rolled steel sheet manufacturing method |
| FR3014447B1 (en) * | 2013-12-05 | 2016-02-05 | Fives Stein | METHOD AND INSTALLATION FOR CONTINUOUS THERMAL TREATMENT OF A STEEL BAND |
| CN107002164B (en) | 2014-11-28 | 2019-05-03 | 杰富意钢铁株式会社 | The manufacturing method and quenching quenching unit of metal plate |
| KR102430332B1 (en) * | 2017-10-31 | 2022-08-05 | 제이에프이 스틸 가부시키가이샤 | Steel plate manufacturing equipment and manufacturing method |
| JP6687084B2 (en) * | 2017-11-15 | 2020-04-22 | Ｊｆｅスチール株式会社 | Quenching and quenching apparatus, quenching and quenching method, and method for manufacturing metal plate product |
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2021
- 2021-10-27 JP JP2022506877A patent/JP7338783B2/en active Active
- 2021-10-27 CN CN202180091643.XA patent/CN116745446A/en active Pending
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| KR20230122656A (en) | 2023-08-22 |
| JPWO2022163044A1 (en) | 2022-08-04 |
| EP4257709A1 (en) | 2023-10-11 |
| EP4257709A4 (en) | 2024-04-10 |
| WO2022163044A1 (en) | 2022-08-04 |
| MX2023008750A (en) | 2023-08-01 |
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