• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    process of manufacturing a plate, plate, part obtained by deformation of a plate and motor land vehicle. the present invention deals with a plate manufacturing process, in this process, at least one of the following equations (a, b) is observed: where: z is the distance between the plate (1) and the nozzle (17) along the main ejection direction (e), where z is expressed in mm, d is the average height of the outlet (25) of the nozzle (17) along the direction (s) of displacement of the plate (1) in front of the nozzle (17), d is expressed in mm, v is the travel speed of the plate (1) in front of the nozzle (17), and v is expressed in m. s-1, p is the pressure of the mopping gas at the nozzle (17), and p is expressed in n.m-2, and fo2 is the fraction of the volume of oxygen in the mopping gas.
    公开号:BR112015011189B1
    申请号:R112015011189-0
    申请日:2014-02-10
    公开日:2020-10-06
    发明作者:Jean-Michel Mataigne；Didier Dauchelle；Florence Bertrand
    申请人:Arcelormittal；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION
    [001] The present invention deals with a manufacturing process of a plate that comprises a steel substrate in which at least one face is coated with a metallic coating comprising Al, and the rest of the metallic coating is Zn, unavoidable impurities and eventually one or more additional elements chosen from Si, Sb, Pb, Ti, Ca, Mn, Sn, A, Ce, Cr, Zr, or Bi, where the weight content of each additional element in the metallic coating is less than 0, 3%, and the metallic coating has an aluminum weight content between 0.2 and 0.7%. This process comprises at least stages of: - supplying the substrate; - deposition of a metallic coating on at least one face by immersing the substrate in a bath to obtain the plate; - wiping of the metallic coating by at least one nozzle that projects through at least one outlet a wiping gas onto the metallic coating, the plate moving in front of the nozzle and the gas is ejected from the nozzle along a main direction of ejection; and - solidification of the metallic coating. BACKGROUND OF THE INVENTION
    [002] This plate is more particularly intended for the manufacture of body parts for a land motor vehicle such as an automotive vehicle.
    [003] The plate is then cut and deformed to make parts that are assembled to form the body or box.
    [004] This box is then coated with a painting film (or painting system), which ensures a good surface appearance and participates, with the metallic zinc-based coating, in the protection against corrosion.
    [005] The zinc-based coatings of the plates have what is called a ripple of their external surfaces, which can currently only be compensated by considerable thicknesses of paint, under penalty of having an aspect called "unacceptable orange peel" for body parts.
    [006] The waviness W (waviness in English) of the outer surface of a coating is a smooth, pseudoperiodic geometric irregularity, with a very long wavelength (0.8 to 10 mm) that is different from the roughness R that corresponds to the irregularities geometric shapes with small wavelengths. DESCRIPTION OF THE INVENTION
    [007] In the present invention, the arithmetic mean Wa of the wave profile, expressed in pm, was adopted to characterize the wave of the outer surface of a sheet covering, and the wave measures were performed with a cut-off threshold of 0, 8 mm and called Wao, 8.
    [008] A decrease in Wao, 8 ripple can reduce the thickness of the painting film used to achieve a certain quality of painted aspect or, for a constant thickness of painting film, improve the quality of the painted aspect.
    [009] The purpose of the present invention is, therefore, a process for the manufacture of a plate, which comprises a substrate in which at least one face has been coated by immersion with a metallic coating based on zinc and which comprises between 0.2 and 0.7% by weight of Al, and the outer surface of the metallic coating has a reduced Wao, 8 curl.
    [010] For this purpose, the present invention relates to a process according to claim 1.
    [011] The process can also comprise the characteristics of claims 2 to 7, considered alone or in combination.
    [012] The present invention also relates to a plate according to claim 9.
    [013] The plate can also comprise the characteristics of claims 10 and 11, taken alone or in combination.
    [014] The present invention also relates to a part according to claim 12.
    [015] The piece may also comprise characteristics of claims 13 to 17, considered alone or in combination.
    [016] The present invention also relates to a vehicle according to claim 18. BRIEF DESCRIPTION OF THE DRAWINGS
    [017] The present invention will be illustrated by examples given as an indication, not a limitation, and in relation to the accompanying figures in which: - figure 1 is a schematic sectional view showing the structure of a plate according to the present invention; figure 2 is a schematic view of the côté showing a tank and wiping nozzles for making the plate of figure 1; figure 3 is a partial, schematic and enlarged view of the enclosed part III of figure 2; and - figure 4 is a schematic view taken along the arrow IV of figure 3, and illustrating the shape of the exit of the nozzle of figure 3. DESCRIPTION OF ACCOMPLISHMENTS OF THE INVENTION
    [018] The plate 1 of figure 1 comprises a steel substrate 3 covered on each of its two faces 5 by a metallic coating 7.
    [019] It should be noted that the relative thicknesses of substrate 3 and the different layers that cover it were not observed in figure 1 in order to facilitate the representation.
    [020] The coatings 7 present on both sides 5 are analogous and only one will be described in detail below. In a variant (not shown), only one of the faces 5 has a coating 7.
    [021] The coating 7 is generally less than or equal to 25 pm thick and aims to protect substrate 3 against corrosion.
    [022] Coating 7 comprises zinc and aluminum. The aluminum weight content of the metallic coating 7 is between 0.2 and 0.7%, preferably between 0.2 and 0.6%, and preferably encore between 0.2 and 0.5%. As indicated below, the limits of these aluminum content ranges are higher than those of the bath used to make the coating 7. This is explained by the formation of intermetallic substances at the junction between substrate 3 and coating 7, which leads to an increase in the content aluminum coating 7.
    [023] For making the plate, for example, proceed as follows.
    [024] A substrate 3 is used in the form of a strip obtained, for example, by hot and then cold rolling.
    [025] Preferably, for cold rolling, the initial operation consists of cold rolling substrate 3 with a reduction rate generally between 60 and 85%, in order to obtain a substrate 3 with a thickness comprised, for example , between 0.2 and 2 mm.
    [026] In a preferred embodiment, at least the last pass of the cold rolling process is carried out with working cylinders called “smooth”, that is, rectified and non-etched cylinders, whose work surfaces have a Ra2.5 roughness, that is, measured with a cut-off threshold of 2.5 mm, less than 0.5 pm.
    [027] It must be remembered that the working cylinders are the cylinders of the laminator directly in contact with the substrate 3 to ensure its deformation. The term work surface designates its surfaces in contact with the substrate 3.
    [028] Smooth working cylinders will be present at least in the laminator's last cages or when considering the direction of displacement of substrate 3 in the laminator.
    [029] The use of smooth working cylinders for at least the last pass allows better control of the Wao corrugation, 8 of the metal sheet subsequently obtained by coating the substrate 3, on the one hand, of the parts that can be produced by deforming the plate. metal 1 on the other side.
    [030] In particular, such cold inaction allows to reduce the Wao undulation, 8 in relation to a lamination that only uses cylinders of greater roughness, recorded by shot blasting, or by electrical discharge (cylinders called EDT, Electron Discharge Texture in English) , or by electron beam (cylinders called EBT, Electron Beam Texture in English).
    [031] The cold rolled substrate 3 can then be subjected to an annealing carried out in a conventional manner in an annealing furnace under a reducing atmosphere, in order to recrystallize it after the hardening to which it was subjected during the rolling operation cold.
    [032] The recrystallization annealing also allows to activate the faces 5 of the substrate 3 in order to favor the chemical reactions necessary for the subsequent operation of immersion coating.
    [033] According to a grade of the steel, the recrystallization annealing is carried out at a temperature between 650 and 900 ° C for a time necessary for the recrystallization of the steel and the activation of the faces 5.
    [034] Substrate 3 is then cooled to a temperature close to that of a bath 13 contained in a tank 15.
    [035] The composition of bath 13 is based on zinc and contains between 0.1 and 0.5% by weight of aluminum, preferably between 0.1 and 0.4%, and preferably encore between 0.1 and 0.5%. 0.3%.
    [036] The composition of bath 13 can also contain up to 0.3% by weight of optional addition elements such as Si, Sb, Pb, Ti, Ca, Mn, Sn, A, Ce, Cr, Ni, Zr or Bi.
    [037] These different elements can allow, among other things, to improve the corrosion resistance of the coating or else its fragility or its adhesion, for example.
    [038] The technician in the subject who knows their effects on the characteristics of the coating will know how to use them according to the desired complementary purpose. It was also verified that these elements did not interfere with the control of the curl obtained by the process according to the present invention.
    [039] Finally, bath 13 may contain unavoidable impurities from the ingots to feed the tank or from the passage of substrate 3 in bath 13. Iron can thus be mentioned in particular.
    [040] After passing through bath 13, substrate 3 is coated on its two sides 5 by coatings 7 to obtain plate 1.
    [041] As illustrated in figure 2, the plate 1 is then subjected to a wiping by means of nozzles 17 placed on each side of the plate 1 and which project a wiping gas, for example air or an inert gas, in towards the outer surfaces 21 of the liners 7. The wiping gas is ejected from each nozzle 17 along a main ejection direction E. The main ejection directions E of each nozzle 17 are shown in dots in figures 2 and 3.
    [042] In the example shown, the E directions are horizontal and orthogonal to the plate 1. In other embodiments, the E directions may have other inclinations in relation to the plate 1.
    [043] The speed V of displacement of substrate 3 in the production line used and, therefore, in front of the nozzles 17 is, in general, between 80m / min and 300 m / min, and is preferably greater than 120 m / min, and even 150m / min.
    [044] In order to limit the oxidation of coatings 7, it is possible to provide a confinement box 23 to confine the atmosphere around the plate 1 downstream of the nozzles 17. The term downstream must be understood here in relation to the direction of displacement S of plate 1 in front of nozzles 17.
    [045] The containment box 23 can, in a variant, extend upstream to the surface of the bath 13 or to an intermediate position between the nozzles 17 and the surface of the bath 13.
    [046] In certain variants, the installation may not include a containment box.
    [047] In the example described above, nozzles 17 have structures, positions in relation to plate 1 that are analogous and they work with analogous adjustments. Thus, only the right nozzle 17 of figure 2 will be described below, in relation to figure 3.
    [048] As a variant, nozzles 17 can have different structures, different positions and / or work with different settings. It is also possible to provide only one nozzle on one side of the plate 1.
    [049] The nozzle 17 has an outlet 25 through which the wiping gas was ejected towards the outer surface 21 of the coating 7 located on the opposite side. Different external shapes can be considered for the nozzle 17.
    [050] The outlet 25 of the nozzle 17 is positioned at a distance of Z from the plate 1 along the main direction of ejection E. As illustrated by figure 4, the outlet 25 is generally in the form of a slit that extends, perpendicularly to the direction of travel S and to that of figure 3, over a width L at least equal to the width of the plate 1.
    [051] Generally, the height of the outlet 25, that is, its dimension parallel to the direction S of displacement of the plate 1 in front of the nozzle 17, is constant as illustrated by figure 4. Thus, in certain variants, this height can vary in width of outlet 25. Thus, outlet 25 may, for example, have a slightly enlarged shape towards its ends (bow tie shape).
    [052] In order to take into account these possible variations in height and the different possible embodiments, the average height d of outlet 25 in its width L will be considered subsequently.
    [053] The pressure of the mopping gas at nozzle 17 is called P and the fraction of volume of oxygen in the mopping gas is called fO2.
    em que: Z é expressa em mm d é expressa em mm V é expressa em m. s-1 P é expressa em N.rrr2[054] In accordance with the present invention, at least one of the following equations is observed: where: Z is expressed in mm d is expressed in mm V is expressed in m. s-1 P is expressed in N.rrr2
    [055] In other words, if equation (A) is not observed, equation (B) must be observed and vice versa. Equations (A) and (B) can also be observed simultaneously.
    [056] Generally, parameters V and d are imposed by the production line used. Therefore, only Z and P, and even fθ2, remain to be adjusted to meet the above requirements.
    [057] Parameters thus fixed allow to reach, after solidification of the coatings 7 and before any skin-pass, a Wao, 8 undulation less than or equal to 0.55 pm as illustrated by example 1 below.
    em que Z é expressa em mm d é expressa em mm V é expressa em m.s’1 P é expressa em N.m[058] Even more advantageously, at least one of the following equations is observed: where Z is expressed in mm d is expressed in mm V is expressed in m.s'1 P is expressed in Nm
    [059] In other words, if equation (C) is not observed, equation (D) must be observed and vice versa. Equations (C) and (D) can also be observed simultaneously.
    [060] If the parameters Z, d, V, P and mouth observe equation (C) and / or to equation (D), in this case, after the solidification of coatings 7 and before a possible skin-pass, a Wao, 8 ripple less than or equal to 0.35 pm is reached.
    [061] Coatings 7 are then allowed to cool in a controlled manner so that they solidify.
    [062] As indicated above, at the end of these cools 7, the outer surfaces 21 of coatings 7 have Wao undulations, 8 less than 0.55 pm, and even less than 0.35 pm.
    [063] In a variant, a brushing can be performed to remove the coating 7 deposited on a face 5 so that only one of the faces 5 of the substrate 3 is finally coated with a coating 7.
    [064] When the coatings 7 are completely cooled, the plate 1 can be subjected to a skin-pass operation to give the outer surfaces 21 of the coatings 7 a texture that facilitates the later modeling of the plate 1.
    [065] In fact, the skin-pass operation allows to transfer to the external surfaces 21 of the coatings 7 of the plate 1 a sufficient roughness so that its modeling is carried out in good conditions, favoring a good retention of the oil applied on plate 1 before its modeling. The elongation rate of the plate 1 during the skating operation is generally between 0.5 and 2%.
    [066] Preferably, the skin-pass operation will make it possible to preserve on the outer surfaces 21 of the coatings 7 a Wao undulation, 8 less than 0.55 pm, and preferably less than 0.35 pm.
    [067] In a first variant, the skin-pass operation will be performed with EDT working cylinders whose work surfaces have a Ra2.5 roughness between 2.05 and 2.95 pm. If the elongation rate during the skin-pass operation is less than or equal to 1.1%, the Ras.s roughness of the work surfaces of the EDT work rollers will preferably be between 2.50 and 2.95 pm. If the elongation rate during the skin-pass operation is greater than or equal to 1.1%, the roughness Ra2.5 of the work surfaces of the EDT work cylinders is preferably between 2.05 and 2.50 pm.
    [068] In another variant, the skin-pass operation will be performed with EBT work cylinders whose work surfaces have a Ra2.5 roughness between 2.90 and 4.10 pm. If the elongation rate during the skin-pass operation is less than or equal to 1.1%, the roughness Ra2.5 of the work surfaces of the EBT work cylinders will preferably be between 3.50 and 4.10 pm. If the elongation rate during the skin-pass operation is greater than or equal to 1.1%, the roughness Ra2.5 of the work surfaces of the EBT work cylinders will preferably be between 2.90 and 3.50 pm.
    [069] The skin-pass operation is generally performed for a plate 1 for the manufacture of body parts for automotive vehicles.
    [070] When plate 1 is intended for the manufacture of household appliances, for example, this additional operation is not performed.
    [071] Plate 1 either undergoes a skin-pass operation or can then be cut out and then modeled, for example by stamping, folding or profiling, to form a part which can then be painted to form , over each coating 7, a painting film (or painting system).
    [072] In the case of parts for household appliances, it is also possible to eventually subject the painting films to annealing by physical and / or chemical means, known in themselves.
    [073] For this purpose, it is possible to make the painted piece pass through a hot air or induction oven, or under UV lamps or under a device that diffuses electron beams.
    [074] After deformation, the outer surfaces of the tiles 7 of the piece have a Wao undulation, 8 less than or equal to 0.60pm, and even less than or equal to 0.45pm, and even less than or equal to 0.43pm, and even 0.41 pm, and even 0.37pm.
    [075] This undulation may, for example, be measured after a 3.5% equibiaxial deformation.
    [076] The control of the Wao undulation, 8 before any skin-pass and after any skin-pass to values less than or equal to 0.55pm, respectively 0.35pm, as described above allows to control the Wao undulation, 8 after deformation to values less than or equal to 0.60pm, respectively 0.45pm, 0.43pm, 0.41 pm and even 0.37pm.
    [077] For automotive applications, after phosphating, each part is immersed in a cataphoresis bath, and a layer of primer paint, a layer of base paint, and eventually a layer of enamel of finishing.
    [078] Before applying the layer of cataphoresis on the part, it is previously degreased and then phosphated in order to ensure the adhesion of the cataphoresis.
    [079] The cataphoresis layer provides the piece with additional protection against corrosion. The primer paint layer, usually applied by spray, prepares the final appearance of the piece and protects it from shot blasting and UV. The base paint layer gives the piece its color and its final appearance. The enamel layer gives the surface of the piece good mechanical resistance, a resistance against aggressive chemical agents and a good surface appearance.
    [080] Generally, the weight of the phosphating layer is between 1.5 and 5 g / m2
    [081] The paint films used to protect and guarantee an optimum surface aspect to the pieces, comprise, for example, a cataphoresis layer from 15 to 25 pm thick, a primer paint layer from 35 to 45 pm thick , and a base paint layer of 40 to 50 pm thick.
    [082] In cases where the painting films also comprise an enamel layer, the thicknesses of the different painting layers are generally as follows: cataphoresis layer: between 15 and 25pm, preferably less than 20pm, paint layer primer: less than 45pm, base paint layer: less than 20pm, and enamel layer: less than 55 pm.
    [083] Paint films may also not include a layer of cataphoresis, and only comprise a layer of primer paint and a layer of base paint and possibly a layer of enamel.
    [084] Preferably, the total thickness of the painting films will be less than 120 pm, and even 100 pm.
    [085] The present invention will now be illustrated by tests given as an indication and not a limitation. EXAMPLE 1 INFLUENCE OF FO2 VOLUME FRACTION
    [086] The tests carried out in this example aim to show the positive influence of observing equations (A) and / or (B), and even (C) and / or (D).
    [087] Table I below details the conditions of a series of tests performed with values other than Z, d, V, P and fO2 and shows the Wao.s undulations measured before skin-pass, and NSKP means not subjected to a skin-pass.
    [088] The Wao, 8 ripple measurement procedure consists of acquiring a 50 mm length sheet metal profile (without skid), 45 ° from the rolling direction. From the signal obtained by probing, the approximation of its general form to a polynomial with a degree of at least 5 is subtracted. The wavelength and the arithmetic mean roughness Ra is then separated by a Gaussian filter applying a 0.8 mm cutt-off.
    [089] The columns on the right specify, for each test, whether the parameters comply with equations (A), (B), (C) and (D). TABLE I
    [090] Thus, the use of parameters that observe equation (A) and / or (B) allows to achieve ripples before the skin-pass Wao, less than 0.55 pm.
    [091] The use of parameters that comply with (C) and / or (D) allows reaching ripples before the Wao skin-pass, 8 even smaller and less than or equal to 0.35 pm.
    [092] Undulations before the skin-pass Wao, 8 less than or equal to 0.35 pm can in certain cases be achieved without respecting equations (C) and / or (D), in particular, respecting equations (A) and / or (B) and using smooth working cylinders for cold lamination and / or of particular roughness for the skin-pass, as explained below. EXAMPLE 2 INFLUENCE OF COLD LAMINATION WITH SMOOTH WORKING CYLINDERS
    [093] The tests carried out in this example aim to show the positive influence of a cold rolling made with smooth working cylinders, in relation to a rolling made with EDT working cylinders whose work surfaces have a more important roughness.
    [094] For this purpose, steel substrates are subjected to cold rolling to reach a thickness of 0.8 mm, using working cylinders called smooth whose work surfaces have a Ra2.5 roughness of 0.5 pm, or EDT work cylinders whose work surfaces have a Ra2.5 roughness of 3 pm. Substrates 3 are then coated with a zinc coating by hot dip coating in a zinc bath comprising 0.18% by weight of aluminum, whose temperature is 460 ° C, and are dried with nitrogen to form coatings zinc which are 6.5 pm thick.
    [095] After complete cooling of the sheets 1 thus obtained, they are subjected to a skin-pass operation carried out with EBT engraved work cylinders, whose work surfaces have a Ra2.5 roughness of 5 pm, before being cut and modeled by stamping,
    [096] The Wao wave values, 8 of the outer surfaces 21 of the coatings 7 are measured at the end of each of the process steps, that is, after cold rolling (LAF), after the skin-pass operation (SKP ) and after modeling (DEF). The latter is performed by equibiaxial deformation of 3.5% with a Marciniak tool.
    [097] The results of Wao's measurements, 8 are shown in Table II.
    [098] As can be seen, the use of smooth inaction makes it possible to reduce the Wao curl, 8 either at the end of the cold inaction, skin-pass or modeling step. TABLE II EXAMPLE 3 INFLUENCE OF SKIN-PASS
    [099] The tests carried out in this example aim to show the positive influence of a skin-pass made using work cylinders whose work surfaces have a certain Ra2,5 roughness.
    [0100] For this purpose, steel substrates 3 are subjected to a cold inaction to form cold rolled substrates whose thickness is 0.7 mm.
    [0101] Substrates 3 are then coated with a zinc coating by hot dip coating in a zinc bath comprising 0.18% by weight of aluminum, whose temperature is 460 and are dried with nitrogen to form zinc coatings that are 6.5 pm thick.
    [0102] The sheets 1 thus obtained are divided into two batches.
    [0103] Before being modeled by 3.5% equibiaxial deformation with a Marciniak tool, sheets 1 from the first batch are subjected to a skin-pass made with EDT working cylinders and with an elongation rate of 1, 4%, The Ra2.5 roughness of the work surfaces is 2.20 pm.
    [0104] Plates 1 from the second batch are subjected to a skin-pass operation with the same elongation rate, but with EDT engraved work cylinders, whose work surfaces have a Ra2.5 roughness of 2.60pm.
    [0105] The test results are shown in Table III. TABLEIII
    权利要求:
    Claims (18)
    [0001]
    em que: Z é a distância entre a chapa (1) e o bico (17) ao longa da direção principal de ejeção (E), sendo que Z é expressa em mm, d é a altura média da saída (25) do bico (17) ao longo do sentido (S) de deslocamento da chapa (1) diante o bico (17), sendo que d é expressa em mm, V é a velocidade de deslocamento da chapa (1) diante do bico (17), sendo que V é expressa em m.s-1, P é a pressão do gás de enxugamento no bico (17), sendo que P é expressa em N.rrr2, e fO2 é a fração de volume de oxigênio no gás de enxugamento.1. A PLATE MANUFACTURING PROCESS (1) characterized by comprising a steel substrate (3) in which at least one side (5) is coated with a metallic coating (7) comprising Al, and the remainder of the metallic coating ( 7) is Zn, unavoidable impurities and eventually one or more additional elements chosen from Si, Sb, Pb, Ti, Ca, Mn, Sn, A, Ce, Cr, Zr or Bi, with the weight content of each additional element in the metallic coating (7) it is less than 0.3%, and the metallic coating (7) has an aluminum content between 0.2 and 0.7% by weight; the process comprises at least the steps of: - supplying the substrate (3), - depositing a metallic coating (7) on at least one face (5) by immersing the substrate (3) in a bath to obtain the plate (1 ), - wiping the metallic coating (7) by at least one nozzle (17) that projects at least one outlet (25) a wiping gas onto the metallic coating (7), the plate (1) moving in front of from the nozzle, and the wiping gas is ejected from the nozzle (17) along a main direction of ejection (E), - solidification of the metallic coating (7), and - the outer surface (21) of the metallic coating (7) after solidification and before any skin-pass operation, a Wao wave, s less than or equal to 0.55pm, a process in which at least one of the following equations is observed: where: Z is the distance between the plate (1) and the nozzle (17) along the main ejection direction (E), where Z is expressed in mm, d is the average height of the nozzle outlet (25) (17) along the direction (S) of displacement of the plate (1) in front of the nozzle (17), where d is expressed in mm, V is the speed of displacement of the plate (1) in front of the nozzle (17), where V is expressed in ms-1, P is the pressure of the mopping gas in the nozzle (17), where P is expressed in N.rrr2, and fO2 is the volume fraction of oxygen in the mopping gas.
    [0002]
    2. PROCESS according to claim 1, characterized in that at least one of the following equations is verified:
    [0003]
    PROCESS according to any one of claims 1 to 2, characterized in that the process comprises, before the deposition step, a cold rolling step of the plate (1) in which at least the last pass is carried out with rectified working cylinders and not engraved whose work surfaces have a Ra2.5 roughness less than or equal to 0.5 pm.
    [0004]
    PROCESS according to any one of claims 2 to 3, characterized by the Wao, 8 undulation of the outer surface of the metallic coating (7) after solidification and before a possible skin-pass operation is less than or equal to 0.35 pm .
    [0005]
    PROCESS according to any one of claims 1 to 4, characterized in that the process comprises a skin-pass step of the plate (1) with EDT working cylinders whose work surfaces have a Ra2.5 roughness between 2.05 and 2.95 pm.
    [0006]
    PROCESS according to any one of claims 1 to 4, characterized in that the process comprises a skin-pass step of the plate (1) with EBT working cylinders whose work surfaces have a Ra2.5 roughness between 2.90 and 4.10 pm.
    [0007]
    PROCESS according to any one of claims 1 to 6, characterized in that the metallic coating (7) has an aluminum weight content less than or equal to 0.6%.
    [0008]
    PROCESS according to claim 7, characterized in that the metallic coating (7) has an aluminum weight content less than or equal to 0.5%.
    [0009]
    9. SHEET (1) characterized by comprising a steel substrate (3) in which at least one face (5) is coated with a metallic coating (7) deposited by immersing the substrate in a bath, which coating comprises between 0, 2 and 0.7% by weight of Al, and the rest of the metallic coating (7) is Zn, unavoidable impurities and eventually one or more additional elements chosen from Si, Sb, Pb, Ti, Ca, Mn, Sn, A, Ce, Cr, Zr or Bi, the weight content of each additional element in the metallic coating (7) being less than 0.3%, and the outer surface of the metallic coating (7) has a Wao.s undulation before of a possible skin-pass operation, less than or equal to 0.35pm.
    [0010]
    SHEET according to claim 9, characterized in that the metallic coating (7) has an aluminum content less than or equal to 0.6% by weight.
    [0011]
    SHEET according to claim 10, characterized in that the metallic coating (7) has an aluminum weight content less than or equal to 0.5%.
    [0012]
    12. PIECE OBTAINED BY DEFORMING A SHEET as defined in any one of claims 9 to 11, characterized in that the outer surface of the metallic coating has a Wao undulation 8 or less than 0.43pm.
    [0013]
    13. PIECE according to claim 12, characterized in that the outer surface of the metallic coating has a Wao, 8 undulation less than or equal to 0.41 pm.
    [0014]
    PIECE according to claim 13, characterized in that the outer surface of the metallic coating has a Wao, 8 undulation less than or equal to 0.37pm.
    [0015]
    PIECE according to any one of claims 12 to 14, characterized in that the piece further comprises a painting film on the metallic coating (7).
    [0016]
    16. PIECE according to claim 15, characterized in that the paint film thickness is less than or equal to 120 pm.
    [0017]
    17. PIECE according to claim 16, characterized in that the paint film thickness is less than or equal to 100 pm.
    [0018]
    18. GROUND MOTOR VEHICLE characterized by comprising a body, which body comprises a part as defined in any one of claims 12 to 17.
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    WO2014135999A1|2014-09-12|
    KR20150061025A|2015-06-03|
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    法律状态:
    2018-02-27| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2018-03-13| B25A| Requested transfer of rights approved|Owner name: ARCELORMITTAL (LU) |
    2019-10-22| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|
    2020-07-28| B09A| Decision: intention to grant|
    2020-10-06| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 10/02/2014, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    FRPCT/FR2013/050479|2013-03-06|
    PCT/FR2013/050479|WO2014135753A1|2013-03-06|2013-03-06|A method for manufacturing a metal sheet with a znal coating and with optimised drying, corresponding metal sheet, part and vehicle|
    PCT/IB2014/058879|WO2014135999A1|2013-03-06|2014-02-10|A method for manufacturing a metal sheet with a znal coating and with optimised drying, corresponding metal sheet, part and vehicle|
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