WO2020171253A1 - Tôle d'acier plaquée ayant une excellente résistance au soudage à l'état fondu, et son procédé de fabrication - Google Patents

Tôle d'acier plaquée ayant une excellente résistance au soudage à l'état fondu, et son procédé de fabrication Download PDF

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WO2020171253A1
WO2020171253A1 PCT/KR2019/002084 KR2019002084W WO2020171253A1 WO 2020171253 A1 WO2020171253 A1 WO 2020171253A1 KR 2019002084 W KR2019002084 W KR 2019002084W WO 2020171253 A1 WO2020171253 A1 WO 2020171253A1
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Prior art keywords
steel sheet
layer
plated steel
plating
plated
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PCT/KR2019/002084
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English (en)
Korean (ko)
Inventor
박경관
홍문희
박태열
한은수
김문기
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포스코강판 주식회사
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Priority to PCT/KR2019/002084 priority Critical patent/WO2020171253A1/fr
Priority to US17/419,065 priority patent/US20220064774A1/en
Publication of WO2020171253A1 publication Critical patent/WO2020171253A1/fr

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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
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58—Roll-force control; Roll-gap control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • 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
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/10—Alloys based on aluminium with zinc as the next major constituent
    • 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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
    • C23C18/04—Pretreatment of the material to be coated
    • 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
    • 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
    • C23C2/12—Aluminium or alloys based thereon
    • 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
    • C23C2/26—After-treatment
    • 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
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • 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
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/023—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/023—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only
    • C23C28/025—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only with at least one zinc-based layer
    • 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
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process

Definitions

  • the present invention relates to a technology for manufacturing a plated steel sheet, and more particularly, to a plated steel sheet having excellent fusion resistance and a method for manufacturing the same.
  • Plated steel sheets manufactured by hot dip plating and electroplating are mainly used as steel sheets for interior and exterior construction, home appliances, and automobiles based on excellent corrosion resistance.
  • plating components with a relatively low melting point are melted and adhered to the mold, which is often caused by damage to the mold, damage to the molded product, and loss of corrosion resistance of the molded product due to the loss of the plating layer, and periodic mold cleaning. It acts as a cause of the decrease in productivity.
  • Patent Document 1 and Patent Document 2 can be cited as a technique for solving such problems of the prior art.
  • Patent Document 1-2 discloses a method of reducing friction with the mold by applying an organic resin on the surface of the plated steel sheet, but there are disadvantages of lowering weldability, contamination of the mold due to the detachment of the organic resin, and an increase in manufacturing cost. .
  • Patent Document 1 Korean Patent Application Publication No. 10-2015-0080014
  • Patent Document 2 Republic of Korea Patent Publication No. 10-2015-0080012
  • an aspect of the present invention is to provide a plated steel plate having excellent fusion resistance without applying a separate organic resin to the plated steel plate.
  • Another aspect of the present invention is to provide a method of manufacturing a plated steel sheet having excellent fusion resistance without applying a separate organic resin.
  • the surface layer portion of the plating layer is composed of an alloy layer having a thickness of 0.1 to 100 ⁇ m including hard alloy phases having an area ratio of 1% or more, and a remaining soft plating layer,
  • the hard alloy phase contains Al, Zn, Mg, Si, Fe, and residual inevitable impurities, and in its own weight%, the sum of Al, Zn and Fe is 70% or more for hot forming with excellent fusion resistance. It relates to a plated steel sheet.
  • the hard alloy phase has an area ratio in the range of 15 to 100%.
  • the soft plating layer contains Al, Zn, Mg, Si and residual inevitable impurities, and the sum of Al and Zn is made of 60% or more in terms of its own weight.
  • It relates to a method of manufacturing a plated steel sheet for hot forming excellent in fusion resistance, characterized in that temper rolling is performed at a pressure of 10 to 50,000 MPa while heating the plated steel sheet in the temper rolling process in a temperature range of 300 to 700°C. .
  • the plating layer contains Al, Zn, Mg, Si, and remaining unavoidable impurities, and the sum of Al and Zn is 60% or more in terms of its own weight.
  • the hard alloy phase contains Al, Zn, Mg, Si, Fe and residual unavoidable impurities, and it is preferable that the sum of Al, Zn, and Fe is 70% or more, in terms of its own weight percent.
  • the hard alloy phase has an area ratio in the range of 15 to 100%.
  • the base steel sheet is immersed in a hot-dip plating bath to form a hot-dip plating layer on its surface.
  • Al, Zn, Mg, Si, and Fe are included in the surface layer portion of the plated steel sheet, and the sum of Al, Zn, and Fe is 70% or more and 0.1-100 ⁇ m
  • a hard alloy layer having a thickness can be formed, and further, since the alloy phases constituting the hard alloy layer may have an area ratio of 1% or more, a plated steel sheet for hot forming excellent in fusion resistance can be effectively provided.
  • 1 is a diagram showing a cross section of a plated layer of a plated steel sheet that has undergone conventional temper rolling.
  • FIG. 2 is a diagram showing a cross-section of a plated layer of a plated steel sheet subjected to temper rolling according to the present invention, (a) is a case where a part of the alloy layer formed on the surface layer of the plated layer by temper rolling remains, and (b) is the plated layer This figure shows the case where all of them are formed of an alloy layer without remaining.
  • FIG. 3 is an actual cross-sectional photograph of the plating layer of a plated steel sheet
  • (a) is a cross-sectional photograph of the plating layer of a plated steel sheet subjected to conventional temper rolling
  • (b) is a cross-section of the plating layer of the plated steel sheet subjected to temper rolling according to the present invention. Show the picture.
  • the plating layer partially dissolves when heated to a high temperature for hot forming and adheres to the mold during hot forming. Therefore, the present inventors have repeatedly studied to solve the problems of the prior art, and as a result, before heating the plated steel sheet to a high temperature for hot forming, the structure of the surface layer of the plated layer is not easily dissolved at high temperature. By controlling the phase, it is confirmed that a plated steel sheet having excellent fusion resistance can be manufactured during hot forming, and the present invention is presented.
  • the plated steel sheet for hot forming excellent in fusion resistance of the present invention is a plated steel sheet in which a plating layer is formed on one or both sides of the holding steel sheet, and the surface layer portion of the plating layer is a hard alloy phase having a surface area ratio of 1% or more. It is characterized in that it is made of an alloy layer having a thickness of 0.1 ⁇ 100 ⁇ m and the remaining soft plating layer containing them.
  • FIG. 1 is a diagram showing a cross section of a plated layer of a plated steel sheet that has undergone conventional temper rolling.
  • Figure 2 is a diagram showing the cross-section of the plating layer of the plated steel sheet subjected to temper rolling according to the present invention, (a) is a case where a partial plating layer remains in a part of the alloy layer formed on the surface layer of the plating layer by temper rolling, (b) is the plating layer It is a figure showing the case where all of these are formed in an alloy phase without remaining.
  • a hard alloy layer 13 is formed between the holding steel plate 11 and the surface plated layer 15. It is a well-known fact that the hard alloy layer 13 is an intermetallic compound formed by a reaction between a component metal constituting the plating layer and a base iron component. In contrast, in the case of the plated steel sheet using the temper rolling process of the present invention, a hard alloy layer 23 is formed on the base steel sheet 21 as shown in Fig. 2(a-b).
  • FIG. 3 is an actual cross-sectional photograph of the plating layer of the plated steel sheet
  • (a) is a cross-sectional photograph of the plating layer of the plated steel sheet subjected to conventional temper rolling corresponding to FIG. 1
  • (b) is a pattern corresponding to FIG. 2(b)
  • a cross-sectional photograph of the plating layer of the plated steel sheet subjected to temper rolling according to the invention is shown.
  • the plated steel sheet for hot forming of the present invention includes a holding steel sheet 21.
  • carbon steel or the like as the holding steel sheet, but the present invention is not limited thereto, and materials having various compositional compositions may be used.
  • the plated steel sheet for hot forming of the present invention includes a hard alloy layer 23 formed on the surface layer of the plated layer of the base steel sheet 21, as shown in FIG. 2(b).
  • the alloy layer 13 formed between the conventional steel sheet 11 and the plating layer 15 is rapidly grown to the surface of the plating layer through hot temper rolling in advance, as shown in FIG. 2(b), It is characterized in that it provides a plated steel plate in which a hard alloy layer 23 is formed on the surface layer of the plated layer of the holding steel plate 21.
  • the hot temper rolling process the plated layer is changed into a hard alloy layer, and thereafter, the alloying reaction between the plated layer and the mold is prevented in the hot forming process of 700°C or higher, thereby improving fusion resistance.
  • the surface layer portion of the plating layer includes an alloy layer 23 having a thickness of 0.1 to 100 ⁇ m including hard alloy phases having an area ratio of 1% or more, and the remaining soft plating layer 25 as shown in FIG. 2(a). Can be made.
  • the reaction with the mold may increase at high temperature.
  • the thickness of the alloy layer 23 is less than 0.1 ⁇ m, the diffusion of the plating layer cannot be suppressed, so that the fusion resistance is insufficient. If the thickness exceeds 100 ⁇ m, even if hot temper rolling is performed, a hard alloy layer to the surface of the plated layer (23) You may not be able to grow enough.
  • the hard alloy phase is more preferably controlled to have an area ratio in the range of 15 to 100%, even more preferably 50 to 100%, most preferably, the hard alloy layer having an area ratio of 100% (When all the plating layers are turned into alloy layers).
  • the hard alloy phase contains Al, Zn, Mg, Si, Fe, and residual unavoidable impurities, and it is preferable that the sum of Al, Zn, and Fe is 70% or more in terms of its own weight%. If the sum of Al, Zn, and Fe is less than 70% by weight, sufficient corrosion resistance cannot be secured, and metal vaporization of the plating layer may occur during the high-temperature molding process.
  • the surface layer portion of the plating layer includes an alloy layer 23 and a soft plating layer 25 that has not changed into an alloy layer despite temper rolling as a residual component, as shown in Fig. 2(a).
  • the plating layer 25 contains Al, Zn, Mg, Si, and inevitable impurities, and the sum of Al and Zn is preferably 60% or more in terms of its own weight.
  • the present invention can be applied not only to one side of the holding steel sheet, but also to a plated steel sheet in which a plating layer is formed on both sides of the holding steel sheet.
  • the method of manufacturing a plated steel sheet for hot forming of the present invention comprises: a step of charging a steel plate into a plating bath and plating the surface thereof; And a process of temper rolling a plated steel sheet discharged from the plating bath and having a plated layer formed thereon, and heating the plated steel sheet at a temperature range of 300 to 700°C in the temper rolling process at a pressure of 10 to 50,000 MPa. It is characterized by performing temper rolling.
  • the process of manufacturing a plated steel sheet using a hot dip plating method according to an embodiment of the present invention may roughly undergo a process such as pretreatment, heat treatment, plating, hot temper rolling, shape correction, post-treatment, etc. of the holding steel sheet.
  • a pretreatment step of washing the surface of the steel sheet as necessary which may be chemical, physical or electrochemical method.
  • a heat treatment process of heating the pretreated base steel sheet as needed may be performed, which imparts mechanical properties suitable for the purpose of use to the steel sheet, and maintains the same temperature as the molten plating material in the subsequent hot dip plating process. This is to enable uniform plating.
  • a plated layer is formed on the surface of the holding steel plate by immersing the holding steel sheet subjected to the pretreatment or the like in a plating bath to coat the surface of the holding steel plate.
  • a hot-dip plating method or an electroplating method may be used as the plating method, and preferably, a hot-dip plating method is used.
  • the plating layer formed through the plating includes Al, Zn, Mg, Si and residual inevitable impurities, and the sum of Al and Zn is preferably 60% or more in terms of its own weight. Because Al and Zn are the main constituents of the hard alloy layer, and if the sum is less than 60%, the hard alloy layer cannot be sufficiently formed even when hot tempered rolling, and sufficient corrosion resistance is secured by the passivation film of Al and the sacrificial method of Zn. Because I can't.
  • the plated steel sheet on which the plating layer is formed is hot temper rolled.
  • the range of the hot temper rolling temperature it is preferable to control the range of the hot temper rolling temperature to 300 to 700°C. If the hot temper rolling temperature is less than 300°C, the hard alloy layer cannot be sufficiently grown, and if it exceeds 700°C, the plating layer may be fused with the temper rolling roll.
  • both direct or indirect heating methods may be used, and the heating method is not limited to a specific heating method.
  • the hot temper rolling pressure it is preferable to control the hot temper rolling pressure to 10 to 50,000 MPa. If the hot temper rolling pressure is less than 10 MPa, surface finish and yield point elongation cannot be sufficiently controlled, and if it exceeds 50,000 MPa, work hardening occurs and it may be difficult to secure mechanical properties suitable for the required specifications.
  • the surface layer portion of the plated layer of the hot temper-rolled plated steel sheet may include an alloy layer having a thickness of 0.1 to 100 ⁇ m including hard alloy phases having a surface area ratio of 1% or more, and a remaining soft plated layer.
  • the hard alloy phase is more preferably controlled to have an area ratio in the range of 15 to 100%, even more preferably 50 to 100%, and most preferably, the hard alloy phase has an area ratio of 100%.
  • the hard alloy phase includes Al, Zn, Mg, Si, Fe, and residual inevitable impurities, and the sum of Al, Zn, and Fe may be 70% or more, in terms of its own weight percent.
  • a shape correcting process may be performed using a shape corrector to correct defects such as curvature of the plated steel sheet.
  • a temporary rust inhibitor may be applied to the plated steel plate according to the required specification, and then the plated steel plate product produced for easy transportation and handling may be packaged.
  • Each steel plate in the form of a plate having a thickness of 1.0 mm was prepared by using a hot dip plating simulator. Plating of the steel sheets prepared as described above, including Al, Zn, Mg, and Si, and immersing them in a hot-dip plating bath whose weight ratio (%) of Al+Zn is controlled as shown in Table 1 below, and then taken out and plated with a hot-dip plating layer on the surface thereof. A steel plate was prepared.
  • each of the plated steel sheets prepared as described above was hot temper-rolled under the conditions shown in Table 1 below to obtain a plated steel sheet having a hard alloy layer formed on the surface layer of the plated layer.
  • the fusion ratio between the plated steel plate and the mold is determined by making a cup-shaped small mold, then photographing the mold surface before and after hot forming the plated steel plate using a scanning electron microscope, and using an image analyzer to determine the area of the fusion portion. It was measured and evaluated as follows according to the degree of occurrence.
  • the area ratio and thickness of the hard alloy phase were photographed using a scanning electron microscope, and the area and the thickness of the alloy layer were measured using an image analyzer, and evaluated according to the ratio as follows.
  • Inventive Example 1-2 in which the plating layer components and hot temper rolling conditions satisfy the scope of the present invention, a hard layer having a predetermined area ratio and thickness is formed on the surface layer of the plating layer, so that fusion resistance You can see this excellence.
  • the fusion ratio is also reduced to less than 10%, and it can be seen that it has excellent fusion resistance compared to the conventional example.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Metal Rolling (AREA)

Abstract

L'invention concerne une tôle d'acier plaquée ayant une excellente résistance au soudage à l'état fondu, et son procédé de fabrication. La présente invention concerne une tôle d'acier plaquée de formage à chaud ayant une couche plaquée formée sur une surface ou les deux surfaces d'une tôle d'acier de base et ayant une excellente résistance au soudage à l'état fondu, la partie de couche de surface de la couche plaquée étant composée des éléments suivants : une couche d'alliage qui comprend des phases d'alliage dur ayant un rapport d'aire surfacique supérieur ou égal à 1 %, et qui a une épaisseur de 0,1 à 100 µm ; et le reste, qui est constitué d'une couche plaquée molle, et les phases d'alliage dur comprenant Al, Zn, Mg, Si, Fe et le reste constitué d'impuretés inévitables, et ayant une somme d'Al, de Zn et de Fe de 70 % en poids ou plus sur la base du poids de celle-ci.
PCT/KR2019/002084 2019-02-20 2019-02-20 Tôle d'acier plaquée ayant une excellente résistance au soudage à l'état fondu, et son procédé de fabrication WO2020171253A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/KR2019/002084 WO2020171253A1 (fr) 2019-02-20 2019-02-20 Tôle d'acier plaquée ayant une excellente résistance au soudage à l'état fondu, et son procédé de fabrication
US17/419,065 US20220064774A1 (en) 2019-02-20 2019-02-20 Plated steel sheet having excellent fusion resistance, and manufacturing method therefor

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PCT/KR2019/002084 WO2020171253A1 (fr) 2019-02-20 2019-02-20 Tôle d'acier plaquée ayant une excellente résistance au soudage à l'état fondu, et son procédé de fabrication

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WO2020171253A1 true WO2020171253A1 (fr) 2020-08-27

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4947565B1 (fr) * 1970-01-30 1974-12-17
KR100276323B1 (ko) * 1996-12-20 2000-12-15 이구택 용융아연 도금표면에의 드로스 부착방지방법
KR100868457B1 (ko) * 2007-05-31 2008-11-11 주식회사 포스코 도금밀착성이 우수한 합금화용융아연도금강판과 그제조방법
EP2009130A1 (fr) * 2006-04-07 2008-12-31 Nippon Steel Corporation Processus de fabrication de toles d'acier enduites de zinc par immersion a chaud faciles à traiter, ne farinant pas, avec propriété de glissement
KR20120063529A (ko) * 2009-10-26 2012-06-15 신닛뽄세이테쯔 카부시키카이샤 성형성 및 접착 후의 내 박리성이 우수한 합금화 용융 아연 도금 강판과 그 제조 방법

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6138870A (ja) * 1984-07-30 1986-02-24 Dowa Teppun Kogyo Kk メカニカルプレ−テイング用混合粉体およびこれを使用した連続メカニカルプレ−テイング法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4947565B1 (fr) * 1970-01-30 1974-12-17
KR100276323B1 (ko) * 1996-12-20 2000-12-15 이구택 용융아연 도금표면에의 드로스 부착방지방법
EP2009130A1 (fr) * 2006-04-07 2008-12-31 Nippon Steel Corporation Processus de fabrication de toles d'acier enduites de zinc par immersion a chaud faciles à traiter, ne farinant pas, avec propriété de glissement
KR100868457B1 (ko) * 2007-05-31 2008-11-11 주식회사 포스코 도금밀착성이 우수한 합금화용융아연도금강판과 그제조방법
KR20120063529A (ko) * 2009-10-26 2012-06-15 신닛뽄세이테쯔 카부시키카이샤 성형성 및 접착 후의 내 박리성이 우수한 합금화 용융 아연 도금 강판과 그 제조 방법

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