ES2325960T3 - PROCEDURE FOR MANUFACTURING STEEL FLAT PRODUCTS FROM A STEEL THAT FORM A STRUCTURE OF COMPLEX PHASES. - Google Patents

PROCEDURE FOR MANUFACTURING STEEL FLAT PRODUCTS FROM A STEEL THAT FORM A STRUCTURE OF COMPLEX PHASES. Download PDF

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ES2325960T3
ES2325960T3 ES06123134T ES06123134T ES2325960T3 ES 2325960 T3 ES2325960 T3 ES 2325960T3 ES 06123134 T ES06123134 T ES 06123134T ES 06123134 T ES06123134 T ES 06123134T ES 2325960 T3 ES2325960 T3 ES 2325960T3
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rolled strip
hot
strip
thickness
steel
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Brigitte Dr.-Ing. Hammer
Thomas Dr.-Ing. Heller
Dr. Schmitz Johann Wilhelm
Jochen Dr. Wans
Andreas Nuss
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Steel AG
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04Modifying 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
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/041Modifying 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 involving a particular fabrication or treatment of ingot or slab
    • C21D8/0415Rapid solidification; Thin strip casting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421Modifying 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
    • C21D8/0426Hot rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0447Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
    • C21D8/0473Final recrystallisation annealing
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/14Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/001Austenite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/002Bainite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/008Martensite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Steel (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The method for the production of flat steel products useful in automotive industry, comprises casting a steel into a cast strip having a thickness of 1-4 mm, hot-rolling the cast strip in-line into a hot-rolled strip having a thickness of higher than 1.5 mm in a continuous process at 900-1100[deg] C, and coiling the hot-rolled strip at 550-620[deg] C to obtain a hot-rolled strip, which has a minimum tensile strength R m of 800 MPa and a minimum breaking elongation A 8 0 of 10%. The hot-rolled strip is cold-rolled with a thickness of 0.5-1.4 mm at 750-850[deg] C to obtain a cold-rolled strip. The method for the production of flat steel products useful in automotive industry, comprises casting a steel into a cast strip having a thickness of 1-4 mm, hot-rolling the cast strip in-line into a hot-rolled strip having a thickness of higher than 1.5 mm in a continuous process at 900-1100[deg] C, and coiling the hot-rolled strip at 550-620[deg] C to obtain a hot-rolled strip, which has a minimum tensile strength R m of 800 MPa and a minimum breaking elongation A 8 0 of 10%. The steel forms a complex phase structure. The shaping degree is greater than 20%. The width of the hot-rolled strip is more than 1.600 mm. The hot-rolled strip is cold-rolled with a thickness of 0.5-1.4 mm at 750-850[deg] C to obtain a cold-rolled strip, which has a minimum tensile strength of 800 MPa and a minimum breaking elongation A 8 0 of 10%. The cold- or hot-rolled strip is provided with a metallic coating, which is galvanizing.

Description

Procedimiento para fabricar productos planos de acero a partir de un acero que forma una estructura de fases complejas.Procedure for manufacturing flat products of steel from a steel that forms a phase structure complex.

La invención se refiere a un procedimiento para fabricar productos planos de acero, como flejes o recortes de chapa, a partir de aceros de fases complejas de alta resistencia. Los aceros CP de este tipo pertenecen al grupo de los aceros multifásicos. En este caso se trata normalmente de aceros cuyas propiedades se determinan por el tipo, la cantidad y la disposición de las fases de la estructura. Por tanto, en la estructura están presentes al menos dos fases (por ejemplo, ferrita, martensita, bainita). De esta manera tienen una combinación de resistencia/maleabilidad superior en comparación con los aceros convencionales.The invention relates to a method for manufacture flat steel products, such as strapping or cutting sheet metal, from high-strength complex phase steels. CP steels of this type belong to the group of steels multi-phase In this case it is usually steels whose properties are determined by type, quantity and disposition of the phases of the structure. Therefore, in the structure are at least two phases present (for example, ferrite, martensite, bainita). This way they have a combination of superior strength / malleability compared to steels conventional.

Debido a estas particularidades, los aceros multifásicos son de gran interés especialmente para la construcción de automóviles ya que debido a su alta resistencia permiten, por una parte, el uso de menores grosores de materiales y una reducción del peso del automóvil que esto lleva asociado y, por otra parte, mejoran la seguridad de la carrocería del automóvil en caso de un choque (comportamiento al choque). Por tanto, los aceros multifásicos hacen posible con al menos resistencia constante de la carrocería total una reducción del espesor de chapa de una pieza fabricada a partir de tales aceros multifásicos en comparación con una carrocería fabricada a partir de aceros convencionales.Due to these peculiarities, steels Multiphasics are of great interest especially for construction of cars because, due to their high resistance, they allow part, the use of smaller material thicknesses and a reduction in weight of the car that this is associated with and, on the other hand, improve the safety of the car body in case of a shock (behavior to shock). Therefore, steels multiphase make possible with at least constant resistance of the total body a reduction of the thickness of sheet of a piece manufactured from such multiphase steels compared to a body made from conventional steels.

Normalmente, los aceros multifásicos se funden en acerías de convertidores y se cuelan en una planta de colada continua para dar desbastes planos o desbastes planos delgados que luego se laminan en caliente para dar un fleje laminado en caliente y se bobinan. En este caso, las propiedades mecánicas del fleje laminado en caliente pueden variarse mediante un enfriamiento específicamente controlado del fleje laminado en caliente después del laminado en caliente con el objetivo de ajustar determinadas proporciones de la estructura. Los flejes laminados en caliente pueden laminarse además en frío para dar un fleje laminado en frío para también poner a disposición espesores de chapa más delgados (documentos EP 0 910 675 B1, EP 0 966 547 B1, EP 1 169 486 B1, EP 1 319 725 B1, EP 1 398 390 A1).Normally, multi-phase steels melt in steelworks of converters and sneak into a laundry plant continue to give flat slabs or thin flat slabs that then they are hot rolled to give a hot rolled strip And they wind up. In this case, the mechanical properties of the strip hot rolled can be varied by cooling specifically controlled hot rolled strip after of hot rolling with the aim of adjusting certain proportions of the structure. Hot rolled strips they can also be cold rolled to give a cold rolled strip to also make thinner sheet thicknesses available (EP 0 910 675 B1, EP 0 966 547 B1, EP 1 169 486 B1, EP 1 319 725 B1, EP 1 398 390 A1).

Esta ruta de fabricación causa problemas especialmente en la colada de composiciones que solidifican de forma peritéctica. En el caso de estas calidades de acero existe el riesgo de la formación de grietas longitudinales durante la colada continua. La aparición de grietas longitudinales de este tipo puede reducir tan fuertemente la calidad de los flejes laminados en caliente producidos a partir de los desbastes planos o desbastes planos delgados colados que se vuelven inservibles. Para prevenir este riesgo se requieren amplias medidas, como un elevado coste de la llama, que puede llegar hasta tal punto que el procesamiento de las calidades de acero de este tipo se vuelva poco rentable. En la colada de aceros con altos contenidos de Al se producen además interacciones no deseadas con el polvo de colada por las que también se ve influida negativamente la calidad de un producto plano fabricado a partir de estos aceros.This manufacturing route causes problems especially in the casting of compositions that solidify so  peritectic In the case of these qualities of steel there is the risk of the formation of longitudinal cracks during casting keep going. The appearance of longitudinal cracks of this type can reduce the quality of laminated strips so strongly in hot produced from flat roughing or roughing thin cast planes that become unusable. To prevent This risk requires extensive measures, such as a high cost of the flame, which can go so far that the processing of Steel grades of this type become unprofitable. In the Steel casting with high Al contents also occurs unwanted interactions with laundry powder for which also the quality of a flat product is negatively influenced manufactured from these steels.

Otro problema en la fabricación de productos planos a partir de aceros multifásicos de alta resistencia consiste en que al laminar los aceros de este tipo deben aplicarse altas fuerzas de laminado. Este requisito tiene como consecuencia que generalmente con las plantas de fabricación que actualmente están a disposición normalmente pueden ponerse a disposición flejes laminados en caliente de alta resistencia de aceros del tipo en cuestión en muchos casos sólo en un ancho y espesor que ya no satisfacen totalmente los requisitos exigidos actualmente en el sector de la construcción de automóviles. Existe la necesidad adicional de flejes de menor espesor con anchos suficientes. También ha demostrado ser difícil en la práctica durante la manera de proceder convencional fabricar flejes laminados en frío a partir de aceros multifásicos con resistencias de más de 800 MPa.Another problem in product manufacturing flat from high strength multi-phase steels consists in which when rolling steels of this type should be applied high rolling forces This requirement has the consequence that usually with manufacturing plants that are currently at arrangement normally strapping can be made available hot rolled high strength steels of the type in issue in many cases only in a width and thickness that no longer fully satisfy the requirements currently demanded in the car construction sector. There is a need additional strips of smaller thickness with sufficient widths. It has also proved difficult in practice during the way proceed conventional manufacture cold rolled strips from of multi-phase steels with resistors of more than 800 MPa.

Una ruta alternativa para fabricar flejes de acero a partir de un acero multifásico se propone en el documento EP 1 072 689 B1 (DE 600 09 611 T2). Según este procedimiento conocido, para fabricar flejes de acero delgados inicialmente se cuela una masa fundida de acero que contiene (en % en peso) 0,05 y 0,25% de C, en suma 0,5-3% de Mn, Cu y Ni, en suma 0,1-4% de Si y Al, en suma hasta el 0,1% de P, Sn, As y Sb, en suma menos del 0,3% de Ti, Nb, V, Zr y REM, así como respectivamente menos del 1% de Cr, Mo y V, el resto hierro e impurezas inevitables para dar un fleje colado con un espesor de 0,5-10 mm, especialmente 1-5 mm. El fleje colado se lamina a continuación en caliente en línea en una o varias pasadas con un grado de deformación que se encuentra entre el 25% y el 70% para dar un fleje laminado en caliente. La temperatura final del laminado en caliente se encuentra en este caso por encima de la temperatura de Ar_{3}. Después de finalizar el laminado en caliente, el fleje laminado en caliente obtenido se enfría luego en dos etapas. En la primera etapa de este enfriamiento se mantiene una velocidad de enfriamiento de 5-100ºC/s hasta que se alcanza una temperatura que se encuentra entre 400-550ºC. A esta temperatura, el fleje laminado en caliente se deja reposar luego durante un tiempo de reposo que se necesita para hacer posible una transformación bainítica del acero con una proporción de austenita residual de más del 5%. En este caso deberá evitarse la formación de perlita. Después de un tiempo de reposo suficiente para el ajuste de la estructura requerida, el proceso de transformación se interrumpe por el inicio de la segunda etapa de enfriamiento en la que el fleje laminado en caliente se lleva a una temperatura inferior a 400ºC para a continuación enrollarlo en una bobina a una temperatura de bobinado que se encuentra por debajo de 350ºC.An alternative route to manufacture strapping of steel from a multiphase steel is proposed in the document EP 1 072 689 B1 (DE 600 09 611 T2). According to this procedure known, to manufacture thin steel strips initially it strain a melt of steel containing (in% by weight) 0.05 and 0.25% of C, in sum 0.5-3% of Mn, Cu and Ni, in sum 0.1-4% of Si and Al, in sum up to 0.1% of P, Sn, As and Sb, in sum less than 0.3% of Ti, Nb, V, Zr and REM, as well as respectively less than 1% of Cr, Mo and V, the rest iron and unavoidable impurities to give a cast strip with a thickness of 0.5-10 mm, especially 1-5 mm. He cast strip is then hot rolled in line in one or several passes with a degree of deformation that is between 25% and 70% to give a hot rolled strip. The final hot rolling temperature is in this case above the temperature of Ar 3. After finishing the hot rolled, the hot rolled strip obtained is then cool in two stages. In the first stage of this cooling  a cooling rate of 5-100ºC / s until a temperature is reached that It is between 400-550ºC. At this temperature, the hot rolled strip is then allowed to stand for a resting time that is needed to make possible a Bainitic transformation of steel with a proportion of austenite residual of more than 5%. In this case, the formation of perlite After a sufficient rest time for adjustment of the required structure, the transformation process is interrupted by the start of the second stage of cooling in the that the hot rolled strip is brought to a temperature below 400 ° C and then roll it into a coil at a winding temperature that is below 350 ° C.

Con la manera de proceder descrita en el documento EP 1 072 689 B1 deberá ser posible una fabricación sencilla del fleje laminado en caliente con proporciones de estructura bainítica a partir de un acero multifásico que presenta propiedades de TRIP ("TRIP" = "Transformation Induced Plasticity" (plasticidad inducida por la transformación)). Los aceros de este tipo presentan resistencias relativamente altas con buena deformabilidad. No obstante, las resistencias no son suficientes para muchos casos de aplicación, especialmente en el sector de la construcción de automóviles.With the procedure described in EP 1 072 689 B1 it should be possible to make a simple hot rolled strip with proportions of bainitic structure from a multiphase steel that has TRIP properties ("TRIP" = " T ransformation I nduced P lasticity "(transformation-induced plasticity)). Steels of this type have relatively high strengths with good deformability. However, resistance is not enough for many application cases, especially in the car construction sector.

Por tanto, el objetivo de la invención consistió en poner a disposición un procedimiento con el que pudieran producirse productos planos de acero de alta resistencia con una gran diversidad de dimensiones geométricas con gastos de fabricación reducidos.Therefore, the objective of the invention was in making available a procedure with which they could produce high strength steel flat products with a great diversity of geometric dimensions with expenses of reduced manufacturing

Partiendo del estado de la técnica previamente explicado, este objetivo se alcanza mediante un procedimiento según la reivindicación 1 para fabricar productos planos de acero en el que según la invención un acero que forma una estructura de fases complejas que contiene (en % en peso) 0,08-0,11% de C, 1,00-1,30% de Mn, hasta el 0,030% de P, hasta el 0,004% de S, 0,60-0,80% de Si, hasta el 0,05% de Al, hasta el 0,0060% de N, 0,30-0,80% de Cr, 0,060-0,120% de Ti y como resto hierro e impurezas inevitables se cuela para dar un fleje colado con un espesor de 1-4 mm, en el que el fleje colado se lamina en caliente en línea en una operación continua con un grado de deformación de más del 20% a una temperatura final de laminado en caliente que se encuentra en el intervalo de 900-1100ºC para dar un fleje laminado en caliente con un espesor de 0,5-3,2 mm y en el que el fleje laminado en caliente se bobina a una temperatura de bobinado que asciende a 550-620ºC de manera que se obtiene un fleje laminado en caliente cuya resistencia a la tracción R_{m} asciende a al menos 800 MPa a un alargamiento a la rotura A_{80} de al menos el 10%.Starting from the prior art explained, this objective is achieved by a procedure according to claim 1 for manufacturing flat steel products in the that according to the invention a steel that forms a phase structure complexes containing (in% by weight) 0.08-0.11% of C, 1.00-1.30% of Mn, up to 0.030% of P, up to 0.004% of S, 0.60-0.80% of Si, up to 0.05% of Al, up to 0.0060% of N, 0.30-0.80% of Cr, 0.060-0.120% of Ti and other iron and impurities unavoidable sneaks into a cast strip with a thickness of 1-4 mm, in which the cast strip is laminated in hot online in continuous operation with a degree of deformation of more than 20% at a final rolling temperature in hot that is in the range of 900-1100 ° C to give a hot rolled strip with a thickness of 0.5-3.2 mm and in which the strap Hot rolled coil is wound at a winding temperature that amounts to 550-620 ° C so that a hot rolled strip whose tensile strength R_ {m} amounts to at least 800 MPa at an elongation at breakage A_ {80} of at least 10%.

La invención aprovecha además la posibilidad de la colada de flejes para procesar un acero de fases complejas de alta resistencia que solidifica de forma peritéctica en un fleje laminado en caliente. Como el fleje colado ya posee en este caso por sí mismo un pequeño espesor, en el transcurso del laminado en caliente de este fleje sólo deben mantenerse grados de deformación relativamente pequeños para producir productos planos con pequeños espesores como se necesitan especialmente en el sector de la industria del automóvil. Por tanto, mediante la ventaja de un espesor de partida correspondiente del fleje colado es posible fabricar sin problemas con el procedimiento según la invención flejes laminados en caliente que a una distribución de propiedades óptima presentan un espesor máximo 1,5 mm y a partir de los cuales pueden fabricarse, ejemplo, elementos para la estructura portante de un automóvil.The invention also exploits the possibility of strip casting to process a steel of complex phases of high strength that solidifies peritectically in a strip hot rolled. As the cast strip already has in this case by itself a small thickness, in the course of rolling in Hot of this strap only deformation grades should be maintained relatively small to produce flat products with small thicknesses as needed especially in the sector of car industry. Therefore, through the advantage of a corresponding starting thickness of the cast strip is possible manufacture without problems with the process according to the invention hot rolled strips that to a property distribution optimal have a maximum thickness 1.5 mm and from which elements for the bearing structure can be manufactured, for example of a car.

Debido a los pequeños grados de deformación durante el laminado en caliente, las fuerzas de laminado necesarias para ello en comparación con las fuerzas necesarias en el laminado en caliente de desbastes planos o desbastes planos delgados en la manera de proceder convencional son pequeñas, de manera que con el procedimiento según la invención pueden producirse sin problemas flejes laminados en caliente de mayor ancho que claramente se encuentran por encima del ancho de los flejes laminados en caliente de la misma clase de resistencia y espesor que pueden producirse de manera convencional. Por tanto, la invención permite fabricar de forma segura flejes laminados en caliente de alta resistencia constituidos por un acero de fases complejas de la composición especificada procesada según la invención cuyo ancho asciende a más de 1.200 mm, especialmente a más de 1.600 mm.Due to the small degrees of deformation During hot rolling, the necessary rolling forces for this compared to the necessary forces in the laminate hot flat slabs or thin flat slabs in the conventional way of proceeding are small, so that with the procedure according to the invention can occur without problems hot rolled strips of greater width than clearly found above the width of hot rolled strips of the same strength and thickness class that can occur from conventional way. Therefore, the invention allows manufacturing of Safely form high strength hot rolled strips constituted by a steel of complex phases of the composition Specified processed according to the invention whose width amounts to more 1,200 mm, especially more than 1,600 mm.

La aplicación según la invención del procedimiento de colada del fleje en el procesamiento de aceros de alta resistencia del tipo compuesto según la invención ofrece, además de las ventajas previamente mencionadas, la posibilidad, también en lo referente a su comportamiento de solidificación, de colar de forma segura composiciones de acero críticas del tipo procesado según la invención debido a sus propiedades específicas del procedimiento y magnitudes de ajuste (por ejemplo, temperatura final de laminado en caliente, enfriamiento, temperatura de bobinado). Por tanto, la solidificación muy rápida característica de la colada de flejes del fleje colado conduce a, en comparación con una fabricación convencional, un riesgo claramente reducido de la aparición de segregaciones centradas con la consecuencia de que el fleje laminado en caliente producido según la invención presenta a lo largo de su sección transversal y su longitud una distribución de propiedades y estructura especialmente homogéneas.The application according to the invention of strip casting procedure in the processing of steels high strength of the compound type according to the invention offers, In addition to the previously mentioned advantages, the possibility, also in relation to its solidification behavior, of safely strain critical steel compositions of the type processed according to the invention due to its specific properties of the procedure and magnitudes of adjustment (for example, temperature hot rolled finish, cooling, temperature winding). Therefore, the very fast solidification characteristic of Strapping of strapping straps leads to, compared to a conventional manufacturing, a clearly reduced risk of occurrence of segregations centered with the consequence that the Hot rolled strip produced according to the invention features along its cross section and its length a distribution of especially homogeneous properties and structure.

Otra ventaja especial de la manera de proceder según la invención consiste en que el fleje laminado en caliente producido según la invención presenta altas resistencias de al menos 800 MPa, sin que además deba mantenerse un ciclo de enfriamiento especial del fleje laminado en caliente entre el final de laminado en caliente y el bobinado como esto se escribe previamente, por ejemplo, en el documento EP 1 072 689 B1 por la necesidad de una fase de enfriamiento. En la realización del procedimiento según la invención sólo debe garantizarse que el laminado en caliente finalice en una ventana de temperatura limitada relativamente estrecha y que el bobinado también se realice en un intervalo de temperatura exactamente definido. Entremedias tiene lugar un enfriamiento de una etapa.Another special advantage of the way to proceed according to the invention is that the hot rolled strip produced according to the invention exhibits high resistance of at least 800 MPa, without also having to maintain a cooling cycle Special hot rolled strip between the laminate finish hot and winding as this is written previously, by example, in EP 1 072 689 B1 because of the need for a cooling phase In carrying out the procedure according to the invention should only ensure that hot rolling end in a relatively limited temperature window narrow and that the winding is also performed in a range of exactly defined temperature. In between a one stage cooling.

Otra ventaja de la manera de proceder según la invención consiste en que una ampliación de la variedad de propiedades mecánicas del fleje producido según la invención que sólo se basa en un análisis del acero puede conseguirse mediante una variación de las condiciones de enfriamiento y laminado.Another advantage of the way to proceed according to the invention is that an extension of the variety of mechanical properties of the strap produced according to the invention which only based on an analysis of steel can be achieved by a variation of the cooling and rolling conditions.

Los flejes laminados en caliente producidos según la invención son especialmente adecuados para el procesamiento posterior para dar un fleje laminado en frío. Una configuración de la invención conforme a la práctica prevé correspondientemente que el fleje laminado en caliente se lamine en frío para dar un fleje laminado en frío con un espesor de 0,5-1,4 mm, especialmente 0,7 mm a 1,3 mm, como se necesita para la construcción de carrocerías de automóviles. Para eliminar los endurecimientos que se producen durante el laminado en frío, el fleje laminado en frío puede recocerse a una temperatura de recocido de 750-850ºC. Para el fleje laminado en frío producido de esta manera a partir del fleje laminado en caliente fabricado según la invención pueden garantizarse de forma segura resistencias a la tracción de al menos 800 MPa. En este caso, el alargamiento a la rotura A_{50} del fleje laminado en frío también asciende con seguridad a al menos el 10%.Hot rolled strips produced according to the invention they are especially suitable for processing  back to give a cold rolled strip. A configuration of the invention according to practice correspondingly provides that the hot rolled strip is cold rolled to give a strap cold rolled with a thickness of 0.5-1.4 mm, especially 0.7 mm to 1.3 mm, as needed for construction of car bodies. To eliminate hardening which occur during cold rolling, the strip rolled in cold can be annealed at an annealing temperature of 750-850 ° C. For cold rolled strip produced in this way from the hot rolled strip manufactured according to the invention, resistance can be guaranteed safely at tensile of at least 800 MPa. In this case, the elongation to A 50 breakage of the cold rolled strip also amounts to security at least 10%.

Según otra configuración ventajosa de la invención, el fleje laminado en frío puede proveerse de una manera conocida en sí de un recubrimiento metálico en cuyo caso puede tratarse, por ejemplo, de un cincado.According to another advantageous configuration of the invention, the cold rolled strip can be provided in a manner known in itself of a metallic coating in which case it can be, for example, a galvanized.

A continuación se explica más detalladamente la invención mediante ejemplos de realización.The following explains in more detail the invention by examples of embodiment.

En experimentos realizados para comprobar el efecto de la invención, dos aceros A y B compuestos según la invención con la composición especificada en la tabla 1 se fundieron y se colaron en una máquina de colada de dos rodillos para dar respectivamente un fleje colado que tenía un espesor de 1,6 mm.In experiments performed to check the effect of the invention, two steels A and B compounds according to the invention with the composition specified in table 1 melted and sneaked into a two roller casting machine to give respectively a cast strip having a thickness of 1.6 mm.

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TABLA 1TABLE 1

(datos en % en peso)(data in% in weight)

1one

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Los flejes colados a partir de los aceros A y B se laminaron en caliente en línea inmediatamente a continuación de la colada del fleje a una temperatura final de laminado en caliente TFL para dar un fleje laminado en caliente cuyo espesor ascendió a 1,25 mm. A continuación, el fleje laminado en caliente respectivamente obtenido se enfrió directamente en una etapa de enfriamiento hasta una temperatura de bobinado TB y se bobinó. Después del bobinado, los flejes laminados en caliente producidos a partir de los aceros A y B presentaron respectivamente una resistencia a la tracción R_{m} y un alargamiento a la rotura A_{80} que se especifican en la tabla 2 al igual que la temperatura final de laminado en caliente TFL y la temperatura de bobinado TB respectivamente mantenidas durante su fabricación.Straps cast from steels A and B they were hot rolled online immediately after strip casting at a final hot rolling temperature TFL to give a hot rolled strip whose thickness amounted to 1.25 mm Then the hot rolled strip respectively obtained was cooled directly in a stage of cooling to a TB winding temperature and winding. After winding, hot rolled strips produced at from steels A and B they presented respectively a tensile strength R m and elongation at break A_ {80} specified in table 2 as well as the TFL hot rolled final temperature and the temperature of TB winding respectively maintained during manufacturing.

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TABLA 2TABLE 2

22

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El fleje laminado en caliente producido a partir del acero B se lamina en frío después del bobinado y el decapado para dar un fleje laminado en frío de 0,7 mm de espesor y se recuece a una temperatura de 800ºC en continuo para recristalizar el fleje.Hot rolled strip produced from Steel B is cold rolled after winding and pickling to give a 0.7 mm thick cold rolled strip and it is counted at a temperature of 800 ° C continuously to recrystallize the strip.

A un alargamiento a la rotura A_{50} del 15,4%, la resistencia a la tracción R_{m} del fleje laminado en frío así obtenido ascendió a 838 MPa.At an elongation at break A 50 of the 15.4%, the tensile strength R m of the laminated strip in cold thus obtained amounted to 838 MPa.

Claims (9)

1. Procedimiento para fabricar productos planos de acero,1. Procedure for manufacturing flat products of steel,
--
en el que un acero que forma una estructura de fases complejas de la siguiente composición (en % en peso)at that a steel that forms a complex phase structure of the following composition (in% by weight)
C: 0,08-0,11%C: 0.08-0.11%
Mn: 1,00-1,30%Mn: 1.00-1.30%
P: \leq 0,030%P: \ leq 0.030%
S: \leq 0,004%S: \ leq 0.004%
Si: 0,60-0,80%Yes: 0.60-0.80%
Al: \leq 0,05%Al: \ leq 0.05%
N: \leq 0,0060%N: \ leq 0.0060%
Cr: 0,30-0,80%Cr: 0.30-0.80%
Ti: 0,060-0,120%You: 0.060-0.120%
el resto hierro e impurezas inevitablesthe rest iron and inevitable impurities
se cuela para dar un fleje colado con un espesor de 1-4 mm,it sneaks in for give a strained strip with a thickness of 1-4 mm
--
en el que el fleje colado se lamina en caliente en línea en una operación continua con un grado de deformación de más del 20% a una temperatura final de laminado en caliente que se encuentra en el intervalo de 900-1100ºC para dar un fleje laminado en caliente con un espesor de 0,5-3,2 mm, se enfría en una etapa de enfriamiento hasta la temperatura de bobinado yat that the cast strip is hot rolled in line in one operation continues with a degree of deformation of more than 20% at a final hot rolling temperature found in the 900-1100 ° C range to give a laminated strip hot with a thickness of 0.5-3.2 mm, it cools in a cooling stage until the winding temperature Y
--
en el que el fleje laminado en caliente se bobina a una temperatura de bobinado que asciende a 550-620ºC,at that the hot rolled strip is wound at a temperature of winding amounting to 550-620 ° C,
--
de manera que se obtiene un fleje laminado en caliente cuya resistencia a la tracción R_{m} asciende a al menos 800 MPa a un alargamiento a la rotura A_{80} de al menos el 10%.from so that a hot rolled strip is obtained whose resistance at traction R_m amounts to at least 800 MPa at elongation at break A80 of at least 10%.
2. Procedimiento según la reivindicación 1, caracterizado porque el ancho del fleje laminado en caliente asciende a más de 1.200 mm, especialmente a más de 1.600 mm.2. Method according to claim 1, characterized in that the width of the hot rolled strip is more than 1,200 mm, especially more than 1,600 mm. 3. Procedimiento según una de las reivindicaciones precedentes, caracterizado porque el espesor del fleje laminado en caliente asciende a como máximo 1,5 mm.Method according to one of the preceding claims, characterized in that the thickness of the hot rolled strip amounts to a maximum of 1.5 mm. 4. Procedimiento según una de las reivindicaciones precedentes, caracterizado porque el fleje laminado en caliente se lamina en frío para dar un fleje laminado en frío con un espesor de 0,5-1,4 mm.Method according to one of the preceding claims, characterized in that the hot rolled strip is cold rolled to give a cold rolled strip with a thickness of 0.5-1.4 mm. 5. Procedimiento según la reivindicación 4, caracterizado porque el fleje laminado en frío se recuece a una temperatura de recocido de 750-850ºC.5. Method according to claim 4, characterized in that the cold rolled strip is recoated at an annealing temperature of 750-850 ° C. 6. Procedimiento según la reivindicación 4 ó 5, caracterizado porque la resistencia a la tracción del fleje laminado en frío asciende a al menos 800 MPa.Method according to claim 4 or 5, characterized in that the tensile strength of the cold rolled strip amounts to at least 800 MPa. 7. Procedimiento según una de las reivindicaciones 4 a 6, caracterizado porque el fleje laminado en frío presenta un alargamiento a la rotura A_{50} de al menos el 10%.Method according to one of claims 4 to 6, characterized in that the cold rolled strip has an elongation at break A 50 of at least 10%. 8. Procedimiento según una de las reivindicaciones precedentes, caracterizado porque el fleje laminado en caliente o el fleje laminado en frío está provisto de un recubrimiento metálico.Method according to one of the preceding claims, characterized in that the hot rolled strip or the cold rolled strip is provided with a metallic coating. 9. Procedimiento según la reivindicación 8, caracterizado porque el recubrimiento metálico es un cincado.9. The method according to claim 8, characterized in that the metallic coating is galvanized.
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