ES2645994T3 - Chapa de acero de alta resistencia, galvanizada por inmersión en caliente, y proceso para producirla - Google Patents

Chapa de acero de alta resistencia, galvanizada por inmersión en caliente, y proceso para producirla Download PDF

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ES2645994T3
ES2645994T3 ES12834788.7T ES12834788T ES2645994T3 ES 2645994 T3 ES2645994 T3 ES 2645994T3 ES 12834788 T ES12834788 T ES 12834788T ES 2645994 T3 ES2645994 T3 ES 2645994T3
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steel sheet
less
mass
strength steel
galvanized
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Koichi Sato
Shintaro Yamanaka
Soshi Fujita
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Nippon Steel Corp
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Nippon Steel and Sumitomo Metal Corp
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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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
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    • 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
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    • 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
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    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
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    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0436—Cold rolling
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    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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    • C23C2/34—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
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    • C21D2211/00—Microstructure comprising significant phases
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    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12785—Group IIB metal-base component
    • Y10T428/12792—Zn-base component
    • Y10T428/12799—Next to Fe-base component [e.g., galvanized]

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Abstract

Una chapa de acero galvanizada por inmersión en caliente, que es una chapa de acero que comprende (% en masa): C de 0,10 a 0,4% Si de 0,01 a 0,5% Mn de 1,0 a 3,0% O de 0,006% o menos P de 0,04% o menos S de 0,01% o menos Al de 0,1 a 3,0% N de 0,01% o menos Si +Al >= 0,5% y opcionalmente un miembro o dos o más miembros (% en masa) de: Mo de 0,02 a 0,5% Nb de 0,01 a 0,10% Ti de 0,01 a 0,20% V de 0,005 a 0,10% Cr de 0,1 a 2,0% Ca de 0,0005 a 0,05% Mg de 0,0005 a 0,05% REM de 0,0005 a 0,05% Cu de 0,04 a 2,0% Ni de 0,02 a 1,0% B de 0,0003 a 0,007 siendo el resto Fe e impurezas inevitables, en la que la chapa de acero es una chapa de acero de alta resistencia, galvanizada por inmersión en caliente, que comprende como fase principal, expresado como fracción volumétrica, 40% o más de ferrita y 8 a 60% de austenita retenida, y el resto de la estructura está compuesto de un miembro cualquiera o dos o más miembros de bainita, martensita y perlita, en la que, en cuanto a la austenita, granos de austenita que tienen un esfuerzo residual medio de deformación σ R que satisface la fórmula (1) suponen 50% o más: -400 MPa <= σ R <= 200 MPa (1) y en la que la chapa de acero tiene, en su superficie, una capa galvanizada en caliente que comprende Fe en una cantidad menor que 7% en masa, siendo el resto Zn, Al e impurezas inevitables.

Description

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Después, se sumergieron las chapas de acero resultantes en un baño de galvanizado controlado a condiciones predeterminadas y se enfriaron a temperatura ambiente. En este tiempo, se fijó la concentración eficaz de aluminio en 0,09 a 0,17% en masa. En cuanto a algunas de estas chapas de acero, se sumergieron en un baño de galvanizado, se sometieron a cada uno de los tratamientos de formación de aleaciones bajo una condición
5 predeterminada y se enfriaron a temperatura ambiente. Finalmente, la chapa de acero así obtenida se sometió a una laminación final de endurecimiento superficial con una reducción de espesor de 0,4%.
En la tabla 2 se muestran las condiciones del tratamiento térmico y del tratamiento de laminación.
Las propiedades de tracción se evaluaron tirando de una muestra de ensayo en la dirección C en un medidor de tracción JIS número 5. En cuanto la identificación de la estructura, observación de la posición existente y mediciones
10 del tamaño medio de los granos (diámetro medio del círculo equivalente) y ocupación, se decapó con reactivo Nital la chapa de acero en una sección transversal en la dirección de laminación o en una sección transversal perpendicular a la dirección de laminación y se determinó cuantitativamente por observación con un microscopio óptico a aumentos de 500 a 1.000.
En cuanto a la propiedad de flexibilidad en V, se realizó un ensayo de acuerdo con JIS Z 2248 y después de realizar
15 el ensayo para un radio del punzón de perforación de 0,5, 1 y 2 mm, se observó la chapa de acero a simple vista y se juzgó como sigue:
A: sin grietas
B: unas pocas grietas (se generó una pluralidad de grietas en la superficie exterior de la flexión)
C: se formaron grietas
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Claims (1)

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ES12834788.7T 2011-09-30 2012-09-28 Chapa de acero de alta resistencia, galvanizada por inmersión en caliente, y proceso para producirla Active ES2645994T3 (es)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2011217143 2011-09-30
JP2011217143 2011-09-30
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