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WO2006106999A1 - Procede pour produire une tole d’acier laminee a chaud traitee a chaud - Google Patents

Procede pour produire une tole d’acier laminee a chaud traitee a chaud Download PDF

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Publication number
WO2006106999A1
WO2006106999A1 PCT/JP2006/306987 JP2006306987W WO2006106999A1 WO 2006106999 A1 WO2006106999 A1 WO 2006106999A1 JP 2006306987 W JP2006306987 W JP 2006306987W WO 2006106999 A1 WO2006106999 A1 WO 2006106999A1
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WIPO (PCT)
Prior art keywords
hot
steel sheet
furnace
rolled steel
reduction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2006/306987
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English (en)
Japanese (ja)
Inventor
Makoto Katube
Masayuki Miyake
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Nippon Steel Engineering Co Ltd
Original Assignee
Nippon Steel Corp
Nippon Steel Engineering Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Nippon Steel Corp, Nippon Steel Engineering Co Ltd filed Critical Nippon Steel Corp
Priority to CN2006800111120A priority Critical patent/CN101155935B/zh
Priority to JP2007511220A priority patent/JP4619404B2/ja
Priority to BRPI0607715-3B1A priority patent/BRPI0607715B1/pt
Priority to US11/887,176 priority patent/US20080283157A1/en
Publication of WO2006106999A1 publication Critical patent/WO2006106999A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • 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
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • 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
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • 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
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0224—Two or more thermal pretreatments
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
    • 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
    • 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
    • C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment

Definitions

  • the present invention relates to a method for producing a hot-rolled hot-rolled steel sheet in which a hot-rolled steel sheet manufactured by a thin slab continuous forging method is melted.
  • This thin slab continuous forging method is characterized in that the steel sheet is sent directly from the continuous forging process to the rolling process. For this reason, it is extremely energy efficient compared to conventional continuous forging machines that require a number of processes such as billet cooling, defect inspection, defect removal, and heating between the continuous forging process and the rolling process. It is efficient and equipment costs can be kept low. Furthermore, the fact that this thin slab continuous forging machine can be used with electric furnaces that use scrap as a raw material is also a major factor that has attracted attention.
  • steel sheets manufactured by the thin slab continuous forging method have the problem that it is more difficult to create surface quality than steel sheets manufactured by conventional continuous forging machines. For this reason, until recently, the continuous slab forging method was not widely used. In addition, there is very little information on hot-rolled steel sheets produced by the thin slab continuous forging method, and when hot-dip galvanizing is applied to these hot-rolled steel sheets, The method used for this was applied as it was.
  • the “non-oxidation furnace method” is used as a method for hot-rolling hot-rolled steel sheets. In this method, hot-rolled steel sheets are continuously passed through a non-oxidation furnace-, a reduction furnace (annealing furnace), and a cooling furnace, and are heated to high temperatures for oxidation-reduction treatment.
  • an Fe layer can be formed on the surface of a hot-rolled steel sheet by oxidizing in a non-oxidizing furnace and then reducing in a reduction furnace.
  • An oxide film such as FeO on the surface of the steel sheet makes it difficult for the adhesion of the melt to adhere, so removing this from the surface of the steel sheet has the effect of improving the plating wettability against hot dipping.
  • the conventional melt-meshing equipment as described above is designed mainly for passing cold-rolled steel sheets, so the heating rate in the heating zone is approximately 10 ° C / s to 20 ° CZ. It was in the range of s.
  • the maximum temperature during annealing is 640 ° C. It was normal to adjust the temperature to about C ⁇ 660 ° C.
  • Thin slab continuous forging machines have a very narrow width compared to conventional continuous forging machines, and the main inlet nozzle has a special structure. Nozzle clogging easily occurs. Therefore, in order to prevent this, in thin slab continuous forging machines, Ca is added to the ladle to lower the melting point of alumina.
  • the forged slabs of 50 to 80 mm are sent directly to the rolling process for rolling while maintaining a high temperature.
  • This hot rolling mill is a hot rolling mill equivalent to the conventional finishing mill in the hot rolling process, and it rolls from 1.2 mm to 4 mm to produce hot rolled steel sheets.
  • a tunnel furnace with a long residence time is used to keep the thin slab warm, so the amount of scale generated on the slab surface before rolling is large.
  • hot-rolled steel sheets manufactured using the thin slab continuous forging method have a higher amount of smashed knots than conventional continuous forging machines. This is because, in the thin slab continuous forging method, the forged steel sheet is directly fed to the rolling process while being kept at a high temperature and rolled, so that Fe 3 C and C are likely to remain separated on the steel sheet surface. is there. If a large amount of Fe 3 C or the like remains on the surface of the hot-rolled steel sheet, when it is oxidized in a non-oxidizing furnace, C reacts with oxygen, and the formation of the Fe oxide film is partially delayed. As a result, unevenness and pits are generated in the oxide film.
  • the present invention has been made in view of the above problems, and particularly for preventing unplating that occurs on the plating surface when hot-rolling steel sheets manufactured by a thin slab continuous forging method are fused.
  • in mass% C: 0 • 0 3% or more, S i: 0.0 2% or more, M n: 0.1
  • a steel plate produced by forging and hot rolling steel containing 5% or more and C a: 0.0 0 1% or more by the thin slab continuous forging method has a maximum steel plate temperature of 5500 ° C or more 6 The temperature is lower than 50 ° C, the heating rate is 25 ° C / sec or more and heating is performed for 15 seconds or more, and oxidation treatment is performed.
  • the temperature of the steel plate temperature is 5700 ° C or higher and the heat treatment is carried out so that the time is 25 seconds or more and 45 seconds or less.
  • Method for producing a steel sheet is provided.
  • the hot dip may be hot dip galvanized.
  • a hot-rolled hot-rolled steel sheet manufacturing facility that melts and bonds steel sheets manufactured by forging and hot rolling using a thin slab continuous forging method, which are used for oxidation and for reduction.
  • a ratio of the length along the conveying direction of the steel sheet between the furnace used for oxidation and the furnace used for reduction is 0.5 or more and 0.9 or less, Equipment for manufacturing hot-dip hot-rolled steel sheets is provided.
  • the time for the steel sheets to pass through the furnace for the oxidation may be 15 seconds or more and 25 seconds or less.
  • Fig. 1 is a block diagram of a preferred hot-rolled steel sheet manufacturing facility with hot-dip galvanized steel according to the present invention.
  • FIG. 2 is a diagram illustrating temperature changes in a non-oxidation furnace and an annealing furnace of a suitable hot-rolled galvanized steel sheet manufacturing facility according to the present invention.
  • Figure 3 is a diagram before and after the oxidation of a hot-rolled steel sheet manufactured by the thin slab continuous forging method.
  • A shows the hot-rolled steel sheet before oxidation
  • (b) shows the hot-rolled steel sheet after oxidation according to the present invention
  • (c) shows the hot-rolled steel sheet after oxidation according to the prior art.
  • FIG. 4 is a diagram before and after reducing the hot-rolled steel sheet oxidized in a non-oxidizing furnace.
  • CT indicates the hot-rolled steel sheet before reduction
  • e The reduced hot-rolled steel sheet
  • f indicates the hot-rolled steel sheet with insufficient reduction
  • g indicates the hot-rolled steel sheet with excessive reduction.
  • Fig. 5 is a block diagram of the cleaning device in front of the fusion fitting equipment. BEST MODE FOR CARRYING OUT THE INVENTION
  • the hot-dip galvanized steel sheet manufactured by the hot-dip galvanized hot-rolled steel sheet manufacturing method is used as a hot-dip galvanized steel sheet as defined in JISG 330.
  • C a 0.0 0 1
  • Steel sheets produced by rolling and rolling steel containing 1% or more by the thin slab continuous forging method are used.
  • C a is less than 0.001%, nozzle clogging may not be prevented, so addition of more Ca is usually added in the steelmaking process. This is done by adding A 1, C a S i, F e C a, or metallic Ca.
  • FIG. 1 is a configuration diagram of a suitable hot-dip galvanized hot-rolled steel sheet manufacturing facility 1 according to the present invention.
  • This hot-dip galvanized hot-rolled steel sheet manufacturing facility is arranged between the delivery reel 1 0 which is the starting point of the molten zinc plating process line, the take-up reel 1 1 which is the end point, and the reels 10 and 1 1.
  • Preheated furnace (not shown) installed, non-oxidizing furnace 1 2, annealing furnace 1 5 including reduction zone 1 3 and cooling zone 1 4, molten zinc plating bath 1 6, wiping device 1 7, and cooling furnace Consists of 1-8.
  • Sending relay 10 is mass%, C: 0.0 3% or more, S i. 0 2% or more, M n: 0.15% or more, C a: 0.0 0 1 After steel is forged by the continuous slab forging method, it is rolled as it is without lowering the temperature. It is a reel on which a hot-rolled steel plate manufactured in this way is wound.
  • the non-oxidizing furnace 12 is a furnace with a length in the steel-plate transport direction of, for example, 15 m or more and 25 m or less for oxidizing the hot-rolled steel sheet sent from the delivery reel.
  • the plate speed is 120 m, so the oxidation time of the hot-rolled steel sheet in the non-oxidizing furnace 12 is 7 seconds or more and 12 seconds or less.
  • the fuel-air ratio in the non-oxidizing furnace 1 2 is set to 0.9 or more and 0.98 or less.
  • the length in the transfer direction when the preheating furnace is added to the non-oxidizing furnace 12 is set to 30 m or more and 50 m or less, for example.
  • the total oxidation time (passage time) in the non-oxidizing furnace 1 2 and the preheating furnace is 15 to 25 seconds.
  • An annealing furnace 15 arranged continuously in a non-oxidizing furnace 1 2 includes a reduction zone 1 3 for reducing the oxidized hot-rolled steel sheet, and then a cooling zone 1 for cooling the hot-rolled steel sheet.
  • This is a furnace with a length in the transport direction of, for example, 70 m or more and 100 m or less.
  • the reduction time of the hot-rolled steel sheet in the annealing furnace 15 is, for example, 5 70 ° C or more, which is relatively fast. It takes 25 to 45 seconds in the area.
  • H 2 and N 2 are used as the atmosphere in the annealing furnace 15.
  • the reduction zone 13 in which reduction is mainly performed consists of a reduction furnace and a soaking furnace, or only a reduction furnace, and its length in the transfer direction is set to, for example, 50 m or more and 7 O m or less. ing.
  • the hot-dip galvanizing tank 16 is a tank for smashing hot-rolled steel sheets to attach the hot-dip.
  • the wiping device 17 is a device that wipes excess molten metal adhering to the hot-rolled steel sheet with gas.
  • the cooling furnace 18 is a furnace for cooling the hot-rolled steel sheet afterwards.
  • FIG. 2 shows the temperature change of the steel sheet surface when the hot-rolled steel sheet passes through the non-oxidation-furnace 12, reduction zone 1 3, and cooling zone 1 4 of the hot-rolled steel plate manufacturing facility 1.
  • a hot-rolled steel sheet manufactured by a thin slab continuous forging method is sent out from the delivery reel 10, proceeds on the line, enters the non-oxidation furnace 12 through the preheating furnace.
  • the temperature of the hot-rolled steel sheet that entered the non-oxidizing furnace 1.2 is increased so that the maximum steel sheet temperature is not less than 5500 ° C and less than 600 ° C.
  • the surface of the hot-rolled steel sheet is oxidized by heating for 25 to 25 seconds at temperatures of 25 ° CZ to 15 seconds.
  • the time for oxidation treatment here is the pre-tropical and non-oxidizing furnace transit time.
  • Figure 3 shows the hot-rolled steel sheet surface before and after this oxidation treatment.
  • Fig. 3 (a) shows the hot-rolled steel plate before oxidation
  • Fig. 3 (b) shows the hot-rolled steel plate after oxidation according to the present invention
  • Fig. 3 (c) shows that according to the prior art. The hot-rolled steel sheet after being oxidized is shown.
  • the rate of temperature rise in section I in Fig. 2 By setting the rate of temperature rise in section I in Fig. 2 to 25 ° C / sec or higher, which is faster than the conventional rate of temperature rise described above, the effect of preventing non-plating can be obtained.
  • the heating rate in section I is 25 seconds and less than 2 seconds, the oxide Ca a and Ca succinate produced by the addition of Ca, the luminum aluminate, and the smut Fe 3 C, etc. This causes non-plating.
  • Set the heating rate to 25 / sec or more. The reason why non-plating is prevented will be described below.
  • the Fe oxide film on the surface of the hot-rolled steel sheet is formed by the reaction of Fe atoms in the. Further, F e when the oxide film is generated, since the S i and M n present in the steel sheet is also F e Similarly oxide, F e under the oxide film S i ⁇ 2 and M n O A secondary oxide film is produced.
  • the F e oxide film is produced, the C a O and F e 3 C, etc. illustrated in FIG. 3 (a) that adhered to the steel sheet surface, the generation of F e oxide film is inhibited, The pit 19 shown in Fig. 3 (c) is formed.
  • Fe 3 C In the case of Fe 3 C, it decomposes into C and reacts with oxygen, inhibiting the formation of the Fe oxide film, as shown in Fig. 3 (c).
  • the pit 1 9 As described above, the pit 1 9 is formed, as shown in FIG. 3 (c), 2-order oxide film such as S i 0 2 and M n O will come out to the surface. Secondary oxide film such as these S i O 2 and M n O Since degrade the wettability with molten zinc plated, thereby to generate a non-coating when the molten zinc plated.
  • the rate of temperature increase was set to a high value of 25 ° CZ seconds or more, and the rate of Fe oxide film formation was increased.
  • Oxide film formation occurs mainly due to the movement of Fe to the surface, so if the oxide film formation rate is high, Ca O, Fe 3 C, etc. will be pushed out to the steel plate surface as a result. Even if pits are generated with O, Fe 3 C, etc., an Fe oxide film is also formed at the bottom.
  • Fe 2 03 is generated on the pole surface layer of the steel sheet described below, Fe 3 O 4 is formed below it, and Fe O is formed below it. Below 5 70 ° C, Fe 2 0 3
  • the properties of the steel sheet surface after the temperature rising process are as follows from the inside: Fe (steel sheet), oxides of S i or M n, or S i and M n, as shown in Fig. 3 (b).
  • secondary oxide film comprising a composite oxide, thereon, F ea O 4 and F e O or oxide film consisting of F e O, C a O on the surface, there exists F e 3 C, C A_ ⁇ , There is a pit under F e 3 C, but the F e O layer exists.
  • the maximum steel plate temperature in the non-oxidizing furnace is set to less than 600 ° C, excessive oxide film formation is prevented. If the maximum steel sheet temperature in the non-oxidizing furnace is 60 ° C or higher, an oxide film is excessively generated, and the oxide film remains in the subsequent reduction process.
  • the time for keeping the temperature rising rate at 25 or more seconds is 15 seconds or more ⁇ . In less than 5 seconds, there is not enough oxide thickness, As a result, the secondary oxide film composed of S i or M n oxide or S i and M n complex oxide is exposed to the surface without being covered with the FeO film.
  • the oxidized hot-rolled steel sheet travels on the line and enters the reduction zone 13 in the annealing furnace 15.
  • the annealing furnace 15 first, in the reduction zone 1 3, the steel sheet is heated so that the maximum steel plate temperature is not less than 700 ° C and not more than 7600 ° C, and then proceeds to the cooling zone 14. And cooled.
  • the hot-rolled steel sheet is reduced in the reduction zone 13 and cooling zone 14 in the annealing furnace for a period of 25 to 45 seconds with the steel plate temperature kept at 570 ° C or higher.
  • the time from temperature point R to temperature point U, where the steel plate temperature is 5700 ° C is set to 25 to 45 seconds.
  • the reason why the temperature of the reduction treatment is limited to a temperature range of 5.70 ° C or higher is as follows. In other words, at 5 70 or higher, € ⁇ becomes the main component of 6 oxides and is reduced, while at less than 570 ° C, Fe 30 4 becomes the main component of Fe oxides and reduced. F e O is compared to F e 3 ⁇ 4, the process temperature is also likely to be also available reducing high. Therefore, the reduction treatment of F e O is more controllable than the reduction treatment of F e 30 4 .
  • Fig. 4 shows the surface of the hot-rolled steel sheet before and after the above reduction treatment.
  • the hot-rolled steel sheet before reduction treatment is (d), the hot-rolled steel sheet that has been reduced without excess (e), the hot-rolled steel sheet with insufficient reduction treatment (f), and the heat that is excessively reduced.
  • the rolled steel sheet is (g).
  • C 30 and € 3 C shown in Fig. 3 are not shown. This is because these C a O and F e 3 C pass through the annealing furnace 13 and the like. This is because the reducing atmosphere is blown off from the steel sheet surface by the flow of H 2 and N 2 etc.
  • a secondary oxide film of Si or Mn oxide or a composite oxide of Si and Mn formed on Fe is also shown in Fig. 4 as "-S i O 2 , The description is simplified as n O ".
  • the oxide film in the form of Fig. 3 (b) is moderately reduced, as shown in Fig. 4 (e).
  • Fe steel plate
  • S i or M n oxide or S i secondary oxide film comprising a composite oxide of M n exist film made F e thereon, C a O on the surface, pit of F e 3 C was present in the force the bottom remaining
  • the hot-rolled steel sheet in the form with the Fe layer is made to have a steel sheet temperature of 5700 ° C or higher so that the highest steel sheet temperature is 700 ° C or higher and 760 ° C or lower.
  • the surface of the hot-rolled steel sheet shown in Fig. 4 (d) is reduced in the annealing furnace 15 without excess or deficiency.
  • the Fe oxide film formed by the non-oxidized film is all reduced to Fe layer.
  • the F e layer 2 Tsugisan of film such as S i O 2 and M N_ ⁇ generated by acid treatment and reduction treatment or the like even completely covers. Degradation of plating wettability with hot dip zinc plating The secondary oxide film such as S i 0 2 and M n O is completely covered, so the plating wettability is very good and no plating occurs. .
  • the annealing furnace 1 Reduction within 5 becomes excessive.
  • the Fe oxide film is sufficiently reduced to form the Fe layer.
  • S i and M n have higher oxidizing power than Fe, the secondary oxide layer of S i O 2 and M n 0 is not removed even when the Fe oxide film is reduced in the annealing furnace 15. It grows excessively and appears on the surface of the steel sheet. As described above, S i 0 2 and M n 0 deteriorate the plating wettability of the steel sheet, resulting in non-plating.
  • the reduced hot-rolled steel sheet proceeds on the line from the annealing furnace 15 to a hot-dip zinc plating tank 16 heated to a predetermined temperature, and is crushed to adhere the molten zinc plating. .
  • the hot-rolled steel sheet with hot-dip galvanized steel advances on the line, and the amount of hot-dip galvanized steel on the hot-rolled steel sheet is adjusted to a predetermined value by the wiping device 17.
  • the hot-rolled steel sheet travels on the line and is cooled in the cooling furnace 18.
  • the temperature of the hot-rolled steel sheet in the non-oxidizing furnace 12 is increased so that the highest steel sheet temperature is not less than 55 ° C and less than 60 ° C. Since it was heated and oxidized for 15 to 25 seconds at a temperature of ° C / second or more, when an Fe oxide film was formed, it was picked up by a Fe 3 C and other Ca and oxides of Ca. Even if pit 19 is generated, the bottom of pit 19 is covered with the Fe oxide film.
  • the hot-rolled steel sheet is kept at a temperature of 5700 ° C or higher so that the maximum steel plate temperature is 70 ° C or higher and 7600 ° C or lower. Since the heat treatment was reduced for 25 to 45 seconds, the Fe oxide film on the surface of the hot-rolled steel sheet was reduced without excess or deficiency. Further, secondary oxidation layer of S i 0 2 and M n O also not come to the surface. Therefore, the occurrence of non-plating is prevented.
  • the length in the transport direction of the furnace used for oxidation (preheating furnace and non-oxidizing furnace 12) is set to 30 m or more and 50 m or less, and the furnace used for the return-( The length of the reduction zone 1 3) in the conveyance direction was set to 50 m or more and 70 m or less.
  • the furnace used for the return-( The length of the reduction zone 1 3) in the conveyance direction was set to 50 m or more and 70 m or less.
  • non-plating occurs by setting the length ratio of the furnace used for oxidation and the furnace used for reduction along the conveying direction to be 0.5 or more and 0.9 or less. Can be prevented.
  • the furnace used for oxidation and the furnace used for reduction are set to appropriate lengths with no excess or deficiency, so investment in equipment costs is optimized.
  • the hot-rolled steel sheet is delivered from the delivery reel, but may be directly connected to a line for performing the thin slab continuous forging method.
  • the hot-rolled steel sheet is sent from the delivery reel to the non-oxidation furnace, but before being sent to the non-oxidation furnace, processing such as pickling and surface scrubbing may be performed. .
  • the hot-rolled steel sheet is fed from the feed reel into the non-oxidizing furnace and oxidized. It may be provided.
  • an annealing furnace including a reduction zone and a cooling zone is used.
  • separate furnaces such as a reduction furnace and a cooling furnace are used. May be.
  • hot dip galvanizing is used as the hot dip, but aluminum, lead, tin, etc. may be used in addition to zinc.
  • the present invention is particularly effective for hot-rolled steel sheets.
  • the reason for this is presumably that the surface of the hot-rolled steel plate is rougher than the surface of the cold-rolled steel plate, has a larger grain boundary, has a larger surface area, is easier to oxidize and reduce, and has a higher growth rate of the oxide layer.
  • the hot-rolled steel sheet with a good plating state obtained under the oxidation and reduction conditions of the present invention Applying the conventional formulas for estimating the amount of oxidation and reduction of a cold-rolled steel sheet to calculate the amount of oxidation and reduction of a hot-rolled steel sheet
  • the formula for estimating the amount of oxidation of a cold-rolled steel sheet is based on preheating furnace and non-oxidation
  • the amount of oxidation is estimated from two variables: the time spent in the furnace and the temperature reached by the steel sheet.
  • the formula for estimating the reduction amount of cold-rolled steel sheets estimates the reduction quantity from two variables: the time spent in the furnace where the reduction treatment is performed and the ultimate temperature of the steel sheet.
  • the reduction amount when the temperature of the reduction furnace is 570 ° C or higher and the reduction amount when it is lower than 570 ° C are calculated separately, and the sum of the two is calculated.
  • Estimated reduction amount is not shown, they can be derived from experiments.
  • the hot-rolled steel sheet obtained by hot-rolling the flakes obtained with a thin slab forging machine is oxidized and reduced under the suitable oxidation and reduction conditions specified in the present invention, and the oxidation amount and reduction amount at that time was obtained from the above formulas for estimating the amount of oxidation and reduction.
  • the oxidation amount was about 0.1 2 to 0.2 mgZm 2 and the reduction amount was about 0.2 to 0.3 5 mg / m 2 .
  • These values are the amount of oxidation of the cold-rolled sheet obtained by the same formula 0. l O. 'SmgZm 2 , Reduction amount is smaller than 0.4 5 to lmg Z m 2 .
  • the oxidation rate and reduction rate are faster than in the case of cold-rolled steel sheets. It can be estimated that a value smaller than the value of is obtained.
  • the oxidation time and reduction time can be shortened compared to when applied to cold-rolled steel sheets.
  • the length of the furnace for oxidation and reduction can be shortened, and the hot-dip zinc plating facility can be made smaller.
  • the front surface of the melt-meshing equipment of the present invention is an alkali that does not use electrolytic cleaning comprising an alkali spray tank 20, an alkali scrubber tank 2 1, a hot water rinse tank 2 2, and a hot air dryer 2 3.
  • An alkaline scrubber is installed with a cleaning device and nylon brush 24.
  • electrolytic cleaning which is generally used, is not used, is that when a hot-rolled steel sheet is manufactured by a thin slab continuous forging machine and a hot rolling machine directly connected to this, the surface of the steel sheet is removed after hot rolling.
  • Pickling and applying antifungal agent but since the time from pickling to melting is about 2 days or less, the amount of antifungal agent applied may be less than usual. Because.
  • the surface of the steel plate after pickling contains a smaller amount of antifungal agent, such as Fe 3 C, it adheres to the surface using an alkaline cleaning device that does not use electrolytic cleaning. It performed Al force Risukuraba with a nylon brush after washing the anti ⁇ Ya F e 3 C, etc., to remove the anti ⁇ Ya F e 3 C and the like.
  • This cleaning usually removes the fungicide that has been burned and removed in the heating furnace.
  • oxygen in the atmosphere is used stably for oxidation of the steel sheet surface. Therefore, the amount of oxide film produced is stable, This is a preferable condition for the prevention of stable unsettledness.
  • the rate of temperature increase in the oxidation process was set to 25 ° C / s and that the reduction time was shorter than that of the conventional cold-rolled steel sheet, resulting in an increase in the yield point of the steel sheet. This is presumably due to the fact that it is possible to pass through below the strain that causes elongation, so that there is no occurrence of hip folding.
  • the normal sheet feeding speed in the current technology is 90 mpm to 180 mpm
  • the present invention can be applied to newly install or remodel a fusion fitting equipment having this speed range.
  • the upper limit of the plate-feeding speed of the fusion fitting equipment is about 180 mpm.
  • this technology can be applied even if a fusing device with a higher sheet feeding speed is available.
  • the lower limit of the plate feed speed is not limited as long as the conditions of the present invention can be realized.
  • Table 1 shows the percentages of each of the four types of hot-rolled steel sheets A, B, -C, and D manufactured using the thin slab continuous forging method.
  • Table 2 shows the various conditions and the results when hot-rolled steel sheets with hot-dip galvanized steel were produced from these four types of hot-rolled steel sheets using the method for manufacturing hot-rolled steel sheets with hot-dip galvanized steel according to the present invention. Shown in The hot-rolled steel sheet with hot dip galvanized steel is made by passing four types of hot-rolled steel sheets through a preheating furnace, non-oxidation furnace, reduction furnace, soaking furnace, and cooling furnace to perform oxidation treatment, reduction treatment, and cooling. It was processed and then hot-dip zinc plating was performed.
  • the adhesion amount of molten zinc was in the range of 80 to 120 g Zm 2 (single side).
  • Table 2 data Nos. 1 to 4 are examples that satisfy all of the conditions specified in the present invention, and the surface of the hot-rolled hot-rolled steel sheet produced is in a very good condition. ing.
  • Tables 5 through 9 shown in Table 2 are comparative examples that do not satisfy any of the conditions specified in the present invention.
  • the surface of the hot-dip hot-rolled steel sheet produced was not plated or The plating is in poor condition such as scale residue.
  • Table 3 shows the percentages of the components of two types of hot-rolled steel sheets A and B manufactured using the thin slab continuous forging method.
  • Hot-rolled steel sheet with hot-dip galvanized steel is manufactured by oxidizing two types of hot-rolled steel sheets in a preheating furnace and non-oxidation furnace, reducing them in a reduction zone (reduction furnace and soaking furnace), and then hot-dip galvanizing. And went.
  • the preheating furnace and the non-oxidizing furnace correspond to the furnace used for oxidation
  • the reduction zone corresponds to the furnace used for reduction.
  • Data Nos. 3 and 4 shown in Table 4 indicate that the length of the preheating furnace is fixed at 17 m, the length of the deoxidizer is fixed at 21 m, the cooling conditions are changed, and the length of the reduction zone is simulated. Adjusted to 4 1 m and 78 m. Reduction time is 1 It is a value calculated from the feeding speed of 20 m / min.
  • data numbers 1 and 2 indicate that the ratio of the total length of the preheating furnace and the non-oxidizing furnace to the length of the reduction zone is 0.5 or more and 0.9 or less as defined in the present invention.
  • the surface of the hot dip galvanized hot-rolled steel sheet is in a very good plating condition.
  • data numbers 3 and 4 shown in Table 4 indicate that the ratio of the total length of the preheating furnace and the non-oxidation furnace to the length of the reduction zone is outside the range of 0.5 or more and 0.9 or less specified in the present invention.
  • the surface of the hot-rolled steel sheet with molten zinc plated is in a poor plating condition such as non-plating.
  • the present invention is implemented within the plate speed range shown in the above example.
  • the upper limit of the plate feed speed is about 18 O m pm with the current technology.
  • this technology can be applied even if a fusing device with a higher sheet feeding speed is available.
  • the lower limit of the plate feed speed is not limited as long as the conditions of the present invention can be realized. Since the normal sheet feeding speed in the current technology is 90 mpm to 180 mpm, some hot-dip zinc plating equipment may have an economic ton of Zr h limit. In such a case, the plate passing speed decreases as the plate thickness increases, so the time required to pass through the oxidation furnace increases, and as a result, the heating rate decreases. In this case, a part of the heating process may be operated so as to satisfy the heating rate of the present invention. Industrial applicability

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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Thermal Sciences (AREA)
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Abstract

L’invention se rapporte à une tôle d’acier produite par le moulage d’un acier contenant au moins 0,03 % en poids de carbone, au moins 0,02 % en poids de silicium, au moins 0,15 % en poids de manganèse, et au moins 0,001 % en poids de calcium au moyen du procédé de coulée continue de brames minces et par laminage à chaud du coulage et oxydation en le chauffant à un taux de réchauffement de 25 °C/seconde ou plus ) à une température maximale de feuille d’acier de 550-650 °C, 650 °C étant exclu, pendant au moins 15 secondes. La tôle est ensuite réduite en la chauffant à une température maximum de la feuille d’acier de 700-760 °C de telle façon que la période pendant laquelle la température de la feuille d’acier est de 570 °C ou plus, soit comprise ente 25 et 45 secondes. Ensuite, la feuille d’acier est plaquée par un traitement à chaud pour produire une tôle d’acier laminée à chaud et traitée à chaud.
PCT/JP2006/306987 2005-03-30 2006-03-27 Procede pour produire une tole d’acier laminee a chaud traitee a chaud Ceased WO2006106999A1 (fr)

Priority Applications (4)

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CN2006800111120A CN101155935B (zh) 2005-03-30 2006-03-27 热浸镀热轧钢板的制造方法
JP2007511220A JP4619404B2 (ja) 2005-03-30 2006-03-27 溶融めっき熱延鋼板の製造方法
BRPI0607715-3B1A BRPI0607715B1 (pt) 2005-03-30 2006-03-27 "equipamento para produção de tira de aço laminada a quente revestida por imersão a quente".
US11/887,176 US20080283157A1 (en) 2005-03-30 2006-03-27 Method of Production of Hot Dipped Hot Rolled Steel Strip

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JP2005-097390 2005-03-30

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US20100193081A1 (en) * 2007-06-29 2010-08-05 Arcelormittal France Process for manufacturing a galvannealed steel sheet by dff regulation
JP2011508824A (ja) * 2007-12-20 2011-03-17 フェストアルピネ シュタール ゲーエムベーハー スチールのコーティングされ硬化されたコンポーネントを製造する方法と、この方法のためのコーティングされ硬化されたスチール・ストリップ

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CN103978035B (zh) * 2014-04-28 2016-09-07 雷光瑞 热轧钢的加工方法
CN106661657B (zh) * 2014-07-02 2018-11-06 杰富意钢铁株式会社 高强度热镀锌钢板的制造方法

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US20100193081A1 (en) * 2007-06-29 2010-08-05 Arcelormittal France Process for manufacturing a galvannealed steel sheet by dff regulation
JP2011508824A (ja) * 2007-12-20 2011-03-17 フェストアルピネ シュタール ゲーエムベーハー スチールのコーティングされ硬化されたコンポーネントを製造する方法と、この方法のためのコーティングされ硬化されたスチール・ストリップ
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JP4619404B2 (ja) 2011-01-26
US20080283157A1 (en) 2008-11-20
CN101994073A (zh) 2011-03-30
BRPI0607715B1 (pt) 2014-12-16
BRPI0607715A2 (pt) 2009-10-06
CN101155935B (zh) 2011-08-03
JPWO2006106999A1 (ja) 2008-09-25
CN101994073B (zh) 2012-06-27

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