WO2014087452A1 - 連続溶融亜鉛めっき鋼板の製造設備及び製造方法 - Google Patents

連続溶融亜鉛めっき鋼板の製造設備及び製造方法 Download PDF

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Publication number
WO2014087452A1
WO2014087452A1 PCT/JP2012/007778 JP2012007778W WO2014087452A1 WO 2014087452 A1 WO2014087452 A1 WO 2014087452A1 JP 2012007778 W JP2012007778 W JP 2012007778W WO 2014087452 A1 WO2014087452 A1 WO 2014087452A1
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WIPO (PCT)
Prior art keywords
dew point
snout
furnace
steel sheet
refiner
Prior art date
Application number
PCT/JP2012/007778
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English (en)
French (fr)
Japanese (ja)
Inventor
伸行 佐藤
和樹 中里
貴将 藤井
Original Assignee
Ｊｆｅスチール株式会社
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Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to CN201280077492.3A priority Critical patent/CN104838034A/zh
Priority to PCT/JP2012/007778 priority patent/WO2014087452A1/ja
Priority to IN3981DEN2015 priority patent/IN2015DN03981A/en
Priority to US14/649,408 priority patent/US10233526B2/en
Priority to EP12889434.2A priority patent/EP2927342A4/en
Priority to KR1020157015564A priority patent/KR20150084051A/ko
Publication of WO2014087452A1 publication Critical patent/WO2014087452A1/ja

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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
    • 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
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C—CHEMISTRY; METALLURGY
    • 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
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • C23C2/004—Snouts
    • 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
    • C23C2/34—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

Definitions

  • the present invention relates to a manufacturing facility and a manufacturing method for a continuous hot-dip galvanized steel sheet.
  • the continuous hot-dip galvanized steel sheet manufacturing equipment is a hot-dip galvanized steel sheet, which is a strip-shaped steel sheet, continuously annealed in a continuous annealing furnace and then sent directly from the snout on the outlet side of the continuous annealing furnace into a zinc or zinc alloy plating bath. It is equipment to apply.
  • a continuous annealing furnace usually has a heating zone in which a steel plate being conveyed in an airtight furnace is heated to approximately 800 to 1000 ° C. in a high-temperature gas atmosphere, and then a cooling zone in which the steel plate is cooled to approximately 300 to 600 ° C. by low-temperature gas spraying. Have.
  • a soaking zone for soaking the steel strip after heating is installed at the subsequent stage of the heating zone. In some cases, a pre-tropical zone that preheats the steel strip before heating is installed in the preceding stage of the heating zone.
  • Patent Document 1 relates to a bright annealing furnace (equipment only for a furnace without a snout), and enables a significant reduction in the startup time (seasoning time) especially at the start of operation of the new furnace and at the restart after repair.
  • the gas inside the furnace is discharged outside the furnace through a vent pipe arranged at the boundary between the refractory lining the furnace wall and the outer wall iron skin. After removing the impurity components therein and purifying, it is described that an in-furnace gas circulation device is re-supplied into the furnace.
  • Patent Document 2 in a continuous reducing atmosphere annealing apparatus for a metal strip (apparatus only for a furnace without a snout), a refiner (a moisture removing apparatus, referred to as a refining apparatus in Patent Document 2) is used to perform processing.
  • a refiner a moisture removing apparatus, referred to as a refining apparatus in Patent Document 2
  • pre-tropical gas installed in the upstream of the tropics is blown into the cooling zone to improve the cooling efficiency, and conversely, cooling zone gas is blown into the tropics to improve the preheating efficiency.
  • the dew point is controlled by sucking in-furnace gas from the cooling zone using a refiner provided outside the furnace, removing moisture, and returning it to the heating zone.
  • this method cannot secure high plating properties stably. The reason is described below.
  • FIG. 2 is a schematic diagram showing the relationship between the amount of surface oxidation of a component that inhibits plating properties and the atmospheric gas dew point obtained by the inventors' experimental investigation.
  • the general dew point range which is the normal operating range
  • the amount of surface oxidation is large, and the surface concentration of the plating-inhibiting component tends to progress as the annealing temperature increases.
  • the surface concentration of components that inhibit the plating property is suppressed, so that the plating property can be ensured even under high temperature annealing.
  • the surface concentration of the component that inhibits the plating property cannot be suppressed, and the plating property is lowered.
  • the dew point was ⁇ 45 ° C. or lower and Mn It was found that surface concentration was greatly suppressed and Si surface concentration was greatly suppressed at -50 ° C. or lower.
  • the dew point in the furnace in order to suppress the surface concentration of Si and Mn and to ensure stable high plating properties, it is necessary to control the dew point in the furnace to ⁇ 50 ° C. or lower, but it is provided outside the furnace described above.
  • the dew point In the method of using the refiner to suck the furnace gas from the cooling zone, remove the moisture and return it to the heating zone, the dew point can only be lowered to about -40 ° C, and it is difficult to ensure high plating performance stably. there were.
  • a continuous hot-dip galvanized steel sheet manufacturing facility in which a furnace is directly connected to a hot-dip galvanizing bath with a snout that is a closed space for direct feeding of steel strip from the furnace into the plating bath, at least any of the three zones
  • the dew point meter provided in the 1 zone, the furnace gas inlet and outlet, and the refiner, which is a moisture removal device provided outside the furnace, is connected to the inlet and outlet independently for each connected zone.
  • a gas circulation path with the refiner formed in the above, a dew point meter in the snout and a humidifier for humidifying the inside of the snout, and a measured value of a dew point meter in a connected zone for each gas circulation path is a target dew point.
  • the refiner should match A facility for producing a continuous hot-dip galvanized steel sheet, wherein the humidifier operates so that the measured value of the dew point meter of the snout matches the target dew point of the snout.
  • the snout is provided with a gas outlet and a blow-in port for the gas inside the snout, and these are connected to the refiner to form a gas circulation path between the inside of the snout and the measured value of the dew point meter of the snout is
  • the refiner also operates so as to match the target dew point of the continuous hot-dip galvanized steel sheet manufacturing equipment according to (1).
  • the target dew point of the furnace is ⁇ 50 ° C. or lower and ⁇ 80 ° C. or higher, and the target dew point of the snout is ⁇ 35
  • both the quality of the plated product and the plating property can be secured at a high level.
  • FIG. 1 is a schematic diagram showing an example of an embodiment of the present invention.
  • FIG. 2 is a schematic diagram showing the relationship between the surface oxidation amount of a component that inhibits plating properties and the atmospheric gas dew point in the furnace.
  • FIG. 3 is a schematic diagram showing an example of the embodiment of the present invention (an example different from the above-mentioned figure).
  • a heating zone 1 for heating a steel strip S which is a strip-shaped steel plate to be passed through, in order from the upstream side of the feed path, a soaking zone 2 for soaking, and cooling.
  • the continuous annealing furnace divided into all three zones of the cooling zone 3 is directly connected to the hot dip galvanizing bath 5 by the snout 4 which is a closed space for direct feeding of the steel strip from the furnace into the plating bath.
  • Sealing rolls 9 for preventing atmospheric mixing between different processing zones are arranged at the required points from the cooling zone 3 to the snout 4 and the entrance of the heating zone 1 is prevented from entering the furnace.
  • a seal roll 10 is provided for this purpose.
  • a heater is provided in the downstream portion of the cooling zone 3 to be used for overaging treatment. Such premise itself is within the scope of well-known conventional techniques.
  • the dew point meter 6, the furnace gas inlet 7, and the blow-in are provided in at least one of the three zones (in this example, a total of two zones of heating zone 1 and soaking zone 2).
  • a gas circulation path 12, 13 with the refiner 11 is formed independently for each of the connected zones by providing a port 8 and connecting them to a refiner 11 which is a moisture removing device provided outside the furnace.
  • the refiner 11 operates so that the measured value of the dew point meter of the zone connected to each gas circulation path matches the target dew point, and the dew point meter 6 and the humidifier 14 for humidifying the inside of the snout 4 are provided to the snout 4.
  • the humidifier 14 operates so that the measured value of the dew point meter 6 of the snout 4 matches the target dew point of the snout 4.
  • the suction port 7 and the suction port 8 are provided in pairs in the heating zone 1 and the soaking zone 2, respectively, but the dew point is easier to adjust if a plurality of installations are provided. Two or more pairs of suction ports 8 may be provided, and may be appropriately adjusted to achieve a target dew point.
  • the gas circulation paths 12 and 13 connected to different zones are independent from each other, and there is no merging in the refiner 11.
  • the refiner 11 performs an operation of removing moisture from the gas in the gas circuit so that the dew point measurement value of the zone connected to the gas circuit matches the target dew point.
  • the humidifier 14 performs an operation of humidifying (supplying moisture) in the snout so that the measured dew point value in the snout matches the target dew point (which is higher than the target dew point in the furnace zone).
  • the dew point in the furnace is -50 ° C or less.
  • the dew point in the furnace and the dew point in the snout can be controlled independently of each other so that both hot-dip galvanized steel sheet quality and plateability can be secured at a high level. become.
  • the in-furnace zone in which the dew point meter 6, the suction port 7, and the inlet 8 are provided may be at least one zone among all three zones, but the soaking zone 2 is preferable.
  • Soaking zone 2 is a zone where the furnace temperature is higher than the other two zones and the surface concentration of Si and Mi is likely to occur. Therefore, a dew point meter, a suction port and a blow-in port are preferentially provided for this zone.
  • the low dew point control is suitable for high plating stability. Of course, most preferably, it is provided in all three zones.
  • the snout 4 is provided with a gas outlet 7 and an air inlet 8 for the gas in the snout, and these are connected to the refiner 11 to circulate the gas between the inside of the snout.
  • the path 15 is formed and the refiner 11 is operated in addition to the humidifier 14 so that the measured value of the dew point meter of the snout becomes the target dew point of the snout.
  • the target dew point in the furnace is preferably set to ⁇ 50 ° C. or lower in order to suppress the surface concentration of Si and Mn as described above.
  • Such low dew point control is achieved by using the equipment of the present invention, so that surface concentration of Si and Mn can be effectively prevented, and the plating property can be secured at a high level.
  • it since it is extremely expensive to lower the dew point below -80 ° C, it is preferably -80 ° C or higher.
  • the dew point in the snout can be controlled independently of the inside of the furnace by using the equipment of the present invention.
  • the target dew point in the snout is preferably ⁇ 35 ° C.
  • a refiner having a strong dehumidifying ability such as a desiccant method that continuously dehumidifies using calcium oxide, zeolite, silica gel, calcium chloride, or a compressor method that uses alternative chlorofluorocarbon is suitable. is there.
  • the dew point in the furnace is controlled by a method in which the gas in the furnace is sucked from the cooling zone and the moisture is removed and returned to the heating zone using a refiner provided outside the furnace.
  • the lower limit of the dew point reached in the furnace is about ⁇ 40 ° C., and dew point control was not performed in the snout. Therefore, in the plating operation of the high-strength steel sheet to which Si and Mn are added, it has not yet been possible to sufficiently suppress the non-plating and the surface property defect of the plated product.
  • the soaking zone dew point can be stably controlled to -50 ° C or lower and -80 ° C or higher, and the dew point in the snout can be stably controlled to -35 to -10 ° C.
  • the occurrence rate was 100
  • the occurrence frequency of non-plating decreased to 10
  • the occurrence frequency of defective surface quality of the plated product decreased to 20, respectively, and the effect of the present invention was remarkably exhibited.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
PCT/JP2012/007778 2012-12-04 2012-12-04 連続溶融亜鉛めっき鋼板の製造設備及び製造方法 WO2014087452A1 (ja)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CN201280077492.3A CN104838034A (zh) 2012-12-04 2012-12-04 连续热浸镀锌钢板的制造设备及制造方法
PCT/JP2012/007778 WO2014087452A1 (ja) 2012-12-04 2012-12-04 連続溶融亜鉛めっき鋼板の製造設備及び製造方法
IN3981DEN2015 IN2015DN03981A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 2012-12-04 2012-12-04
US14/649,408 US10233526B2 (en) 2012-12-04 2012-12-04 Facility having a continuous annealing furnace and a galvanization bath and method for continuously manufacturing hot-dip galvanized steel sheet
EP12889434.2A EP2927342A4 (en) 2012-12-04 2012-12-04 APPARATUS AND METHOD FOR PRODUCING A CONTINUOUS FIRE-PLATED STEEL PLATE
KR1020157015564A KR20150084051A (ko) 2012-12-04 2012-12-04 연속 용융 아연도금 강판의 제조 설비 및 제조 방법

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2012/007778 WO2014087452A1 (ja) 2012-12-04 2012-12-04 連続溶融亜鉛めっき鋼板の製造設備及び製造方法

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WO2014087452A1 true WO2014087452A1 (ja) 2014-06-12

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US (1) US10233526B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
EP (1) EP2927342A4 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
KR (1) KR20150084051A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CN (1) CN104838034A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IN (1) IN2015DN03981A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
WO (1) WO2014087452A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016152018A1 (ja) * 2015-03-23 2016-09-29 Ｊｆｅスチール株式会社 連続溶融亜鉛めっき装置及び溶融亜鉛めっき鋼板の製造方法
EP3168321A4 (en) * 2014-07-07 2017-05-31 JFE Steel Corporation Production method for alloyed hot-dip-galvanized steel sheet
WO2018047891A1 (ja) * 2016-09-12 2018-03-15 株式会社神戸製鋼所 めっき鋼板の製造方法

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CN108842121A (zh) * 2018-08-25 2018-11-20 宝钢湛江钢铁有限公司 一种带钢连续热浸镀锌系统
CN115287567A (zh) * 2022-08-04 2022-11-04 江阴市华达机械科技有限公司 一种炉鼻子加湿系统
CN117051344A (zh) * 2023-08-02 2023-11-14 山东宇信铸业有限公司 一种大型超厚的铸铁件防护栏热镀锌方法

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