WO2013187039A1 - 鋼帯の連続焼鈍方法、鋼帯の連続焼鈍装置、溶融亜鉛めっき鋼帯の製造方法及び溶融亜鉛めっき鋼帯の製造装置 - Google Patents
鋼帯の連続焼鈍方法、鋼帯の連続焼鈍装置、溶融亜鉛めっき鋼帯の製造方法及び溶融亜鉛めっき鋼帯の製造装置 Download PDFInfo
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- WO2013187039A1 WO2013187039A1 PCT/JP2013/003629 JP2013003629W WO2013187039A1 WO 2013187039 A1 WO2013187039 A1 WO 2013187039A1 JP 2013003629 W JP2013003629 W JP 2013003629W WO 2013187039 A1 WO2013187039 A1 WO 2013187039A1
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- Prior art keywords
- furnace
- steel strip
- gas
- annealing
- dew point
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 93
- 239000010959 steel Substances 0.000 title claims abstract description 93
- 238000000137 annealing Methods 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 26
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims description 13
- 239000008397 galvanized steel Substances 0.000 title claims description 13
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000007789 gas Substances 0.000 claims abstract description 64
- 238000010438 heat treatment Methods 0.000 claims abstract description 34
- 238000002791 soaking Methods 0.000 claims abstract description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000001301 oxygen Substances 0.000 claims abstract description 9
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 9
- 238000005192 partition Methods 0.000 claims description 56
- 238000005246 galvanizing Methods 0.000 claims description 12
- 230000007547 defect Effects 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 238000006392 deoxygenation reaction Methods 0.000 abstract 1
- 238000007747 plating Methods 0.000 description 29
- 238000006722 reduction reaction Methods 0.000 description 15
- 238000011144 upstream manufacturing Methods 0.000 description 13
- 230000009467 reduction Effects 0.000 description 11
- 238000000926 separation method Methods 0.000 description 7
- 238000005275 alloying Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 210000004894 snout Anatomy 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 230000003635 deoxygenating effect Effects 0.000 description 2
- 238000009533 lab test Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Images
Classifications
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- 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
- C21D8/0473—Final recrystallisation 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
- 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
- C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
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- 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
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- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
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- 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
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- 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
-
- 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
- C21D9/562—Details
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
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- C—CHEMISTRY; METALLURGY
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
- C23C2/0222—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating in a reactive atmosphere, e.g. oxidising or reducing atmosphere
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- C—CHEMISTRY; METALLURGY
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
- C23C2/18—Removing excess of molten coatings from elongated material
- C23C2/20—Strips; Plates
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Definitions
- the present invention relates to a steel strip continuous annealing method, a steel strip continuous annealing device, a hot dip galvanized steel strip manufacturing method, and a hot dip galvanized steel strip manufacturing device.
- high-strength steel high-tensile material
- Si is added to the steel
- a high-strength steel strip with good hole-expandability may be produced.
- Si or Al is contained, residual ⁇ is likely to form and steel with good ductility. The possibility that a band can be provided is shown.
- the high-strength cold-rolled steel strip contains oxidizable elements such as Si and Mn, these oxidizable elements are concentrated on the surface of the steel strip during annealing and oxides such as Si and Mn. Are formed, resulting in poor appearance and poor chemical conversion properties such as phosphate treatment.
- Patent Document 1 discloses a method of controlling the dew point from the latter stage of the heating zone to the soaking zone to a high dew point of ⁇ 30 ° C. or higher. This method is advantageous in that it can be expected to some extent and is industrially easy to control to a high dew point.
- this method has a drawback that it is not possible to easily produce a steel type (eg, Ti-IF steel) that is not desirable to operate at a high dew point. This is because it takes a very long time to change the annealing atmosphere once set to a high dew point to a low dew point.
- this method makes the furnace atmosphere oxidizable, there is a problem that an oxide adheres to the roll in the furnace and a pick-up defect occurs if the control is wrong.
- Another approach is to use a low oxygen potential.
- Si, Mn, etc. are very easy to oxidize, in large continuous annealing furnaces such as those placed in CGL (continuous galvanizing line) / CAL (continuous annealing line), the oxidation of Si, Mn, etc. is suppressed. It was very difficult to stably obtain an atmosphere having a low dew point of ⁇ 40 ° C. or less, which is excellent in action.
- Patent Document 2 Techniques for efficiently obtaining an annealing atmosphere with a low dew point are disclosed in, for example, Patent Document 2 and Patent Document 3. These technologies are technologies for relatively small-scale furnaces of 1-pass vertical furnaces, and steels containing oxidizable elements such as Si and Mn in multi-pass vertical annealing furnaces such as CGL / CAL. Annealing the strip is not considered.
- the present invention is less susceptible to pick-up defects and furnace wall damage, and oxidizable elements such as Si and Mn in the steel are concentrated on the surface of the steel strip and oxides of oxidizable elements such as Si and Mn.
- a continuous annealing method and a continuous annealing apparatus for a steel strip that can be formed at low cost and can realize an annealing atmosphere with a low dew point that is suitable for annealing of steel strips containing oxidizable elements such as Si and Mn. The issue is to provide.
- this invention makes it a subject to provide the manufacturing method of the hot dip galvanized steel strip which performs hot dip galvanization after annealing a steel strip with the said continuous annealing method. Moreover, this invention makes it a subject to provide the manufacturing apparatus of the hot dip galvanized steel strip provided with the said continuous annealing apparatus.
- the temperature range where the reduction occurs is 500 ° C to 600 ° C.
- ii) It is at 700 ° C. or higher that oxidizable elements such as Si and Mn are oxidized and surface concentration (plating property inhibiting factor such as non-plating) that is a plating inhibiting factor such as non-plating occurs.
- the means of the present invention for solving the above problems are as follows.
- a heating zone that transports the steel strip in the vertical direction and a soaking zone are provided, and a partition that separates the atmosphere in the furnace is provided in the heating zone to the soaking zone, and atmospheric gas is supplied into the furnace from outside the furnace.
- the furnace gas is discharged from the steel strip introduction part at the lower part of the heating zone, and a part of the furnace gas is sucked and discharged to a refiner having a deoxidizer and a dehumidifier provided outside the furnace.
- the steel strip temperature at the partition passage position is 550.
- a continuous annealing method for a steel strip characterized by controlling the temperature to ⁇ 700 ° C.
- a heating zone that transports the steel strip in the vertical direction and a soaking zone are provided, and a partition that separates the atmosphere in the furnace is provided in the heating zone to the soaking zone, and atmospheric gas is supplied into the furnace from outside the furnace.
- the furnace gas is discharged from the steel strip introduction part at the lower part of the heating zone, and a part of the furnace gas is sucked and discharged to a refiner having a deoxidizer and a dehumidifier provided outside the furnace.
- a vertical annealing furnace configured to remove oxygen and moisture to lower a dew point and return a gas having a lowered dew point back into the furnace, wherein a steel strip temperature at the partition passage position is 550 ° C to 700 ° C
- a continuous annealing apparatus for steel strip characterized in that partition walls are arranged as described above.
- a method for producing a hot-dip galvanized steel strip comprising hot-dip galvanizing after annealing the steel strip by the continuous annealing method described in (1) above.
- An apparatus for producing a hot dip galvanized steel strip comprising a hot dip galvanizing apparatus downstream of the continuous annealing apparatus described in (2).
- the atmosphere in the reduction reaction progress temperature range and the surface concentration progress temperature range atmosphere are separated by the partition walls, so that it is suitable for annealing of steel strips containing oxidizable elements such as Si and Mn.
- An annealing atmosphere with dew point can be realized at low cost.
- ADVANTAGE OF THE INVENTION According to this invention, the metal-plating property when hot-dip galvanizing the steel strip containing oxidizable elements, such as Si and Mn, can be improved.
- FIG. 1 shows a structural example of a continuous galvanizing line for a steel strip provided with a vertical annealing furnace used for carrying out the present invention.
- FIG. 2 shows an arrangement example of the gas suction port to the refiner and the gas discharge port from the refiner in the heating zone to the soaking zone of the annealing furnace.
- the surface enrichment amount of the easily oxidizable element that greatly affects the plating property increases as the steel strip temperature increases, but the temperature influence varies greatly depending on the element type contained in the steel strip. Lab tests show that Mn and Si, known as typical examples of elements used in high-tensile materials, are surface enriched in a steel strip temperature range of 800 ° C or higher and Si of 700 ° C or higher. is doing.
- the dew point in the high temperature region downstream of the partition wall where the surface concentration of the oxidizable element proceeds can be reduced at a low cost. It can be kept low.
- the steel strip temperature at the partition wall separating the atmosphere is less than 550 ° C.
- the reduction does not end on the low temperature side upstream of the partition wall, but proceeds on the high temperature side downstream of the partition wall. Is particularly important.
- a physical separation method As a specific physical separation method, a wall (partition wall) made of heat-resistant bricks or the like can be considered. In this method, since it is necessary to provide an opening for passing the steel strip, the atmosphere cannot be completely separated. However, in this method, it is possible to improve the separation of the atmosphere upstream and downstream of the partition wall by disposing the partition opening as far as possible from the furnace gas discharge port.
- the dew point of the annealing atmosphere can be reduced by combining the arrangement of partition walls with gas suction into the refiner and gas discharge from the refiner. It will be possible to decrease.
- FIG. 1 shows an example of the configuration of a continuous hot dip galvanizing line for steel strips equipped with a vertical annealing furnace used in the practice of the present invention.
- FIG. 2 shows an arrangement example of the gas suction port to the refiner and the gas discharge port from the refiner in the heating zone to the soaking zone of the annealing furnace. The present invention will be described below with reference to FIGS.
- the 1 includes a multi-pass vertical annealing furnace 2 upstream of the plating bath 7.
- the heating zone 3, the soaking zone 4, and the cooling zone 5 are arranged in this order from the upstream side to the downstream side of the furnace.
- a partition wall 11 for separating the atmosphere is disposed in the heating zone 3 to the soaking zone 4.
- the partition wall 11 is disposed substantially vertically, and the partition wall 11 separates the upstream atmosphere and the downstream atmosphere.
- the partition wall 11 is provided with an opening 12 through which the steel strip 1 passes.
- the opening 12 of the partition wall 11 is preferably arranged at a position as far as possible from the opening 13 on the furnace entrance side where the in-furnace gas is discharged.
- the opening 12 of the partition wall 11 is disposed on the upper part of the partition wall (furnace upper side) farthest from the opening 13 on the furnace entrance side.
- a known non-contact method such as gas sealing.
- thermometer 14 is a thermometer for measuring the steel strip temperature at the opening of the partition wall.
- the annealing furnace 2 and the plating bath 7 are connected via a snout 6.
- the furnace from the heating zone 3 to the snout 6 is maintained in a reducing atmosphere gas or a non-oxidizing atmosphere.
- H 2 —N 2 gas is usually used, and is introduced into an appropriate place in the furnace from the heating zone 3 to the snout 6.
- the gas introduced into the furnace is discharged from the entrance side of the furnace, except for inevitable things such as furnace leaks, and the flow of the gas in the furnace is in the direction opposite to the steel strip traveling direction, upstream from the downstream of the furnace. And is discharged out of the furnace through the opening 13 on the furnace entrance side.
- a refiner 15 having a deoxygenating device and a dehumidifying device is arranged outside the furnace, and a part of the atmospheric gas in the furnace is sucked and discharged to the refiner 15 to be in the gas.
- the dew point is lowered by removing the oxygen and moisture, and the gas having the lowered dew point is discharged into the furnace.
- a known refiner can be used.
- the gas suction port to the refiner and the gas discharge port from the refiner are disposed at appropriate positions on the upstream side and the downstream side of the partition wall 11 disposed in the heating zone to the soaking zone.
- gas suction ports to the refiner are arranged in the heating zone at three locations by changing the position in the furnace height direction, and at six locations by changing the position in the furnace length direction and the position in the furnace height direction in the soaking zone. ing.
- the furnace length direction is the left-right direction of FIG.
- the gas discharge port from the refiner is disposed at a position 0.5 m below each suction port. The gas suction amount of each suction port and the gas discharge amount of each discharge port can be adjusted individually.
- the reduction progress temperature is 500 to 600 ° C.
- the surface enrichment progress temperature is 700 ° C. or higher for Si and 800 ° C. or higher for Mn. Since the reduction progress temperature range and the surface concentration progress temperature range are close to each other, if the temperature control is not appropriate, the effect of the present invention may not be exhibited, but may be counterproductive.
- the steel strip temperature at the partition passage position is controlled to be within the range of 550 to 700 ° C.
- the steel strip temperature is less than 550 ° C, it is transported to the high temperature side downstream of the partition wall in a state where the reduction is insufficient. Inhibit.
- the steel strip temperature exceeds 700 ° C., surface concentration progresses on the low temperature side upstream of the partition wall where the dew point is high, thereby inhibiting the plating property.
- a more preferable steel strip temperature at the partition passage position is 600 ° C. to 700 ° C. where the reduction is almost completed and the influence of surface concentration can be almost ignored.
- the steel strip temperature at the partition passage position can be controlled by adjusting the heating capacity such as the amount of combustion of RT according to the conditions such as the line speed and the plate thickness.
- the position in the annealing furnace where the steel strip temperature at the partition passage position is 550 to 700 ° C. is specified in advance, and the partition is arranged here. May be.
- the Si content of the steel strip is 0.1% by mass or less, even if the refiner is not used, Plating properties can be improved.
- the Si content of the steel strip exceeds 0.1% by mass, the plating property cannot be improved unless the dew point of the gas in the furnace is lowered using a refiner.
- the gas may be discharged to the refiner either on the low temperature side upstream of the partition wall or on the high temperature side downstream.
- the refiner gas discharge port is located downstream of the partition wall, the gas is discharged to the refiner downstream from the partition wall and away from the discharge position as much as possible in order to reduce the dew point.
- the gas discharge location from the refiner is not particularly limited. However, from the viewpoint of effectively using the discharge gas having a low dew point, it is preferable to discharge the gas from the refiner to a position as far as possible from the gas discharge port to the refiner.
- the steel strip after passing through the bulkhead is soaked and kept at a high temperature.
- the steel strip temperature in the soaking zone may be appropriately set depending on the required material, and is, for example, about 730 ° C. to 910 ° C.
- the steel strip that has been subjected to the predetermined annealing in the heating zone 3 and the soaking zone 4 is cooled in the cooling zone 5, immersed in the plating bath 7 through the snout 6 and hot dip galvanized.
- the galvanized steel strip is adjusted to a predetermined adhesion amount.
- a galvanizing alloying process is further performed using the heating device 9.
- the surface concentration of easily oxidizable elements such as Si and Mn is suppressed, and when hot dip galvanizing is performed, the plateability can be improved.
- the effect of the method of the present invention was confirmed in a steel strip containing Si: 0.4 to 3.0% by mass and / or Mn: 1 to 3% by mass.
- the steel strip was introduced from the bottom of the furnace. However, the steel strip may be introduced from the upper side of the furnace. In the annealing furnace described above, the steel strip ran above the partition. However, the steel strip may pass below the partition wall. In the annealing furnace described above, the soaking zone and the cooling zone communicated with each other at the upper part of the furnace. However, the soaking zone and the cooling zone may communicate with each other at the bottom of the furnace. In the annealing furnace described above, no preheating furnace is disposed upstream of the heating zone. However, the annealing furnace may include a preheating furnace.
- the annealing method of the present invention can also be applied to an annealing method and an annealing apparatus in a continuous annealing line (CAL) of a steel strip.
- CAL continuous annealing line
- FIGS. 1 and 2 An ART type in which partition walls for physically separating the atmosphere in the furnace are arranged in the heating zone to the soaking zone as shown in FIGS. 1 and 2, and a refiner having a dehumidifying device and a deoxygenating device is arranged outside the furnace.
- the CGL equipped with an (all radiant type) annealing furnace was used to change the atmosphere conditions in the furnace, measure the dew point, hot dip galvanize the steel strip to produce a hot dip galvanized steel strip, and evaluate the plating properties.
- the length of the heating zone to the soaking zone (horizontal length in Fig. 2) is 16m, the length of the heating zone is 6m, the length of the soaking zone is 10m, and the partition wall is 6m from the inlet side furnace wall. is there.
- the soaking zone there are a total of 18 gas supply points from the outside of the furnace, with nine points each in the longitudinal direction of the furnace at a height of 1 m and 10 m from the hearth on the drive side.
- the dew point of the atmospheric gas to be supplied is ⁇ 60 to ⁇ 70 ° C., and it is H 2 —N 2 gas (H 2 concentration 10 vol%).
- the gas suction port to the refiner and the gas discharge port from the refiner are as described in FIG.
- the discharge ports A to I are 0.5 m below the suction ports A to I (suction / discharge from the furnace wall on one side).
- the suction port is ⁇ 200 mm, and the discharge port is ⁇ 50 mm.
- a synthetic zeolite was used for the dehumidifier of the refiner, and a palladium catalyst was used for the deoxygenator.
- the dew point (initial dew point) of the atmosphere when the refiner was not used as the base (-34 ° C to -36 ° C)
- the dew point was measured at the same position as the gas suction port (however, on the side of the furnace wall opposite to the gas suction port).
- the evaluation criteria for plating properties are as follows. ⁇ : Pass (Beautiful surface and outer plate level quality), ⁇ : Pass (inner plate level quality), ⁇ : Micro defect (non-plating, etc.), X: Serious defect (non-plating large), Failed result are shown in Table 2 and Table 3.
- inventive examples have a lower dew point and improved plating properties than the comparative examples.
- the atmosphere in the reduction reaction progress temperature range and the surface concentration progress temperature range atmosphere are separated by the partition walls, so that it is suitable for annealing of steel strips containing oxidizable elements such as Si and Mn.
- An annealing atmosphere with dew point can be realized at low cost.
- ADVANTAGE OF THE INVENTION According to this invention, the metal-plating property when hot-dip galvanizing the steel strip containing oxidizable elements, such as Si and Mn, can be improved.
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Abstract
Description
i)還元がおこる温度域が500℃~600℃であること。
ii)Si、Mn等の易酸化元素が酸化し、不めっき等のめっき性阻害要因である表面濃化(不めっき等のめっき性阻害要因)が起こるのは700℃以上であること。
◎:合格(表面美麗で外板レベルの品質)、○:合格(内板レベルの品質)、△:微小欠陥あり(不めっき等)、×:重大欠陥あり(不めっき大)、不合格
結果を表2、表3に示す。
2 焼鈍炉
3 加熱帯
4 均熱帯
5 冷却帯
6 スナウト
7 めっき浴
8 ワイピングノズル
9 加熱装置
11 隔壁
12 隔壁の開口部
13 炉入側の開口部
14 温度計
15 リファイナ
Claims (4)
- 鋼帯を上下方向に搬送する加熱帯、均熱帯を備え、前記加熱帯~前記均熱帯内に炉内の雰囲気を分離する隔壁が設けられ、炉外より雰囲気ガスを炉内に供給し、炉内ガスを加熱帯下部の鋼帯導入部から排出するとともに、炉内ガスの一部を吸引して炉外に設けた脱酸素装置と除湿装置を有するリファイナに排出してガス中の酸素と水分を除去して露点を低下し、露点を低下したガスを炉内に戻すように構成された縦型焼鈍炉で鋼帯を焼鈍する際に、前記隔壁通過位置の鋼帯温度が550~700℃になるように制御することを特徴とする鋼帯の連続焼鈍方法。
- 鋼帯を上下方向に搬送する加熱帯、均熱帯を備え、前記加熱帯~前記均熱帯内に炉内の雰囲気を分離する隔壁が設けられ、炉外より雰囲気ガスを炉内に供給し、炉内ガスを加熱帯下部の鋼帯導入部から排出するとともに、炉内ガスの一部を吸引して炉外に設けた脱酸素装置と除湿装置を有するリファイナに排出してガス中の酸素と水分を除去して露点を低下し、露点を低下したガスを炉内に戻すように構成された縦型焼鈍炉であって、前記隔壁通過位置の鋼帯温度が550~700℃になるように隔壁を配置したことを特徴とする鋼帯の連続焼鈍装置。
- 請求項1に記載の連続焼鈍方法で鋼帯を焼鈍した後、溶融亜鉛めっきすることを特徴とする溶融亜鉛めっき鋼帯の製造方法。
- 請求項2に記載の連続焼鈍装置の下流に溶融亜鉛めっき装置を備えることを特徴とする溶融亜鉛めっき鋼帯の製造装置。
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EP13803871.6A EP2862946B1 (en) | 2012-06-13 | 2013-06-10 | Method for continuously annealing steel strip, apparatus for continuously annealing steel strip, method for manufacturing hot-dip galvanized steel strip, and apparatus for manufacturing hot-dip galvanized steel strip |
US14/405,071 US10590509B2 (en) | 2012-06-13 | 2013-06-10 | Method for continuously annealing steel strip, apparatus for continuously annealing steel strip, method for manufacturing hot-dip galvanized steel strip, and apparatus for manufacturing hot-dip galvanized steel strip |
KR1020147035255A KR101642632B1 (ko) | 2012-06-13 | 2013-06-10 | 강대의 연속 어닐링 방법, 강대의 연속 어닐링 장치, 용융 아연 도금 강대의 제조 방법 및 용융 아연 도금 강대의 제조 장치 |
CN201380030809.2A CN104379776B (zh) | 2012-06-13 | 2013-06-10 | 钢带的连续退火方法、钢带的连续退火装置、熔融镀锌钢带的制造方法以及熔融镀锌钢带的制造装置 |
JP2013543074A JP5655955B2 (ja) | 2012-06-13 | 2013-06-10 | 鋼帯の連続焼鈍方法、鋼帯の連続焼鈍装置、溶融亜鉛めっき鋼帯の製造方法及び溶融亜鉛めっき鋼帯の製造装置 |
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JP2016125131A (ja) * | 2015-01-08 | 2016-07-11 | Jfeスチール株式会社 | 合金化溶融亜鉛めっき鋼板の製造方法 |
JP2019173144A (ja) * | 2018-03-29 | 2019-10-10 | 株式会社神戸製鋼所 | 竪型連続焼鈍炉及び焼鈍方法 |
JP7073162B2 (ja) | 2018-03-29 | 2022-05-23 | 株式会社神戸製鋼所 | 竪型連続焼鈍炉及び焼鈍方法 |
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CN104379776B (zh) | 2016-07-06 |
KR101642632B1 (ko) | 2016-07-25 |
EP2862946B1 (en) | 2019-03-06 |
KR20150013807A (ko) | 2015-02-05 |
US10590509B2 (en) | 2020-03-17 |
EP2862946A4 (en) | 2015-06-03 |
CN104379776A (zh) | 2015-02-25 |
US20150167113A1 (en) | 2015-06-18 |
JPWO2013187039A1 (ja) | 2016-02-04 |
JP5655955B2 (ja) | 2015-01-21 |
EP2862946A1 (en) | 2015-04-22 |
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