EP3847286A1 - Verzinktes kaltfeinblech mit verbesserten tribologischen eigenschaften ii - Google Patents
Verzinktes kaltfeinblech mit verbesserten tribologischen eigenschaften iiInfo
- Publication number
- EP3847286A1 EP3847286A1 EP19753410.0A EP19753410A EP3847286A1 EP 3847286 A1 EP3847286 A1 EP 3847286A1 EP 19753410 A EP19753410 A EP 19753410A EP 3847286 A1 EP3847286 A1 EP 3847286A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flat steel
- steel product
- strip
- cold
- steps
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
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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
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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
- 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
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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
- 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
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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
- 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
- C21D8/0236—Cold rolling
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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
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
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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
- 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
- C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
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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
- C22C38/18—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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- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/56—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.7% by weight of carbon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
Definitions
- the present invention relates to a method for producing a flat steel product, a corresponding flat steel product, a component obtained therefrom by forming, and its use in the automotive sector, in particular for commercial vehicles, in particular trucks, construction machinery and earth moving vehicles, in the industrial sector, for example as housings or telescopic rails in the construction sector, for example as facade elements, for household appliances, in the energy sector, in shipbuilding.
- the document US 2015/292072 A1 discloses a method for producing a flat steel product with a coating that protects against corrosion, wherein after the uncoated flat steel product has been immersed in a corresponding melt bath, the stripping of the applied liquid metal to set the desired layer thickness takes place using a wiping nozzle, wherein this is arranged under very specific geometric conditions for the flat steel product.
- US 2016/339491 A1 discloses a method for producing a zinc-coated sheet. For this purpose, a cold-rolled steel strip is rolled with a textured roller and then electrolytically coated with a zinc layer that protects against corrosion.
- US 2012/0107636 A1 discloses a method for coating a flat steel product with a coating which protects against corrosion, in particular a coating containing Zn. After the actual coating, the process removes excess liquid metal in a stripping device with a specific geometry.
- galvanized cold-rolled sheet metal For their application in complex outer skin parts of automobiles, galvanized cold-rolled sheet metal must also have very good forming properties in addition to an excellent paint appearance. In addition to mechanical-technological properties from the tensile test are also for good forming properties Good-tribological properties such as low coefficients of friction and a low tendency to wear in the pressing tool at high stroke rates are decisive.
- some outer skin steel grades may change the surface structure in such a way that they generate waves that may lead to a lubricant film tear and thus lead to tears and undesirable constrictions in the component.
- a common test condition for recording the surface change after forming is a biaxial stretching with 3.5% or 5% elongation.
- the ripple is only measured in the profile section (see SEP 1941).
- various measurement methods such as confocal light microscopy or laser scanning, are also suitable for capturing the surface not only along a line, but also in two dimensions.
- the basis of the invention is the knowledge that a ripple characteristic value, which is determined from such a two-dimensional topography measurement, can reflect the appearance of the surface after painting more meaningfully than a simple profile characteristic value.
- Profile filtering takes place only in one spatial direction. With an area measurement, the folding operation is possible in both lateral directions. This is more realistic because the counterpart to filtering, the lacquer layer, does not cover the roughness in a linear manner, but rather over a large area.
- the measuring surface must have a width of at least 0.5 mm and a length of at least 25 mm.
- the lateral resolution of the measuring points must be at least 10 pm.
- the height data must be aligned in the area.
- the aligned data are low-pass filtered using a surface filter in accordance with DIN EN ISO 16610-61: 2012.
- the weight function of the area filter has the equation of a rotationally symmetrical Gaussian function with a cut-off wavelength w of 0.6 mm.
- a profile or several profiles are extracted from the topography measurement data along the measurement direction, and the profile or the profiles is / are high-pass filtered in accordance with the DIN EN ISO 11562 standard with a cutoff wavelength of 5 mm.
- the root mean square RMS is calculated from the height data and thus the Wsq value is obtained.
- the object of the present invention is therefore to provide a flat steel product, in particular a flat steel product provided with a corrosion-protective coating, which retains an excellent surface quality during forming, in particular cold forming, into corresponding components.
- This retention of the excellent surface can be described by an AWsq value.
- the AWsq value results from the subtraction of the Wsq value of the component at 0% degree of deformation from the Wsq value of the formed component.
- flat steel product means steel strips, steel sheets, plates obtained therefrom and the like.
- flat steel products designed as steel strips are the subject of the invention.
- step (B) introducing the slab from step (A) into at least one hot rolling step to obtain a hot strip
- step (D) cold rolling the hot strip from step (C) in at least two cold rolling steps
- step (D) wherein no recrystallization annealing is carried out between the at least two cold rolling steps of step (D),
- the relative thickness reduction is at most 1.40% of the total thickness reduction.
- the tasks are also solved by a flat steel product provided with a protective coating against corrosion, and by a component obtained therefrom and by the use of the flat steel product or component in the automotive sector, in particular for commercial vehicles, in particular trucks, construction machinery and earth moving vehicles, in the industrial sector, for example as a housing or telescopic rails, in the construction sector, for example as facade elements, for household appliances, in the energy sector, in shipbuilding.
- Step (A) of the method according to the invention comprises providing a slab.
- the term “slab” is known per se to the person skilled in the art. Slabs which can be used according to the invention have suitable dimensions. According to the invention, the slab used can have any steel composition which makes the flat steel product or component obtained therefrom suitable for the uses preferred according to the invention.
- a slab is provided in step (A), containing, in addition to Fe and unavoidable impurities (all data in% by weight)
- the steel composition of the slab is also found in the flat steel product made from it.
- the present invention therefore preferably also relates to the flat steel product according to the invention, the said steel composition having.
- Step (B) of the method according to the invention comprises introducing the slab from step (A) into at least one hot rolling step in order to obtain a hot strip.
- a so-called preliminary strip is preferably first produced from a slab with a thickness of 240 to 270 mm, preferably approximately 255 mm.
- This can be done by so-called reversing rolling on at least one roughing stand, which passes through the strip back and forth.
- the number of stitches must preferably be odd, otherwise the rolling stock would move backwards in the direction of the slab furnace.
- the reversing rolling can therefore be carried out by 1 to 11 roll passes, in which case a pre-strip is produced from the slab with a thickness of 25 to 50 mm, preferably 35 to 45 mm.
- This preliminary strip then preferably enters the finishing line, which preferably consists of 5 to 9, for example 7, finishing stands, the strip then becoming ever thinner from stand to stand.
- Rolling is preferably not reversing here, but only in one direction, namely forward in the direction of the reel.
- the hot strip then preferably has a thickness of 1.5 to 10 mm, particularly preferably 2.5 to 8 mm.
- the reversing roughing happens preferably at temperatures between 1000 to 1350 ° C, particularly preferably 1020 to 1290 ° C.
- the strip is, for example, 900 to 1100 ° C hot and we are then rolled.
- the temperature is, for example, 750 to 980 ° C., preferably 780 to 950 ° C.
- the width of the hot strip is typically 500 to 2500 mm, preferably 800 to 2000 mm.
- Step (C) of the method according to the invention comprises cooling the hot strip from step (B).
- Step (C) according to the invention is preferably carried out in such a way that the temperature control in the cooling section is described by the following function (I) starting at the point in time and at the point where the last rolling stand is left:
- the concept of the target temperature of the hot strip means that even at temperatures of the hot strip with up to ⁇ 1% deviation from the target temperature, process methods and flat steel products according to the invention are obtained, the temperature being calculated in degrees Celsius and the 1 percent deviation based on the Celsius value is.
- a value of f k (x) of 100 means that the temperature is a value between 99 ° C and 101 ° C inclusive.
- step (C) Qualitatively it was found that a not too slow cooling in step (C) leads to particularly good results, as the sample samples produced show.
- the goal was to mathematically describe the values describing the cooling (x ,; yi) j , where x, the cooling time in seconds and y, the temperature of the hot strip in C ° after x, seconds for the flat steel product j map a function (x ,, yrf (Xi)) j .
- the temperature of the hot strip in ° C after x seconds in the cooling section is approximated as a function value of a symmetrical sigmoid function as a function of the cooling time x in s.
- step (C) of the process according to the invention can be carried out by any method known to the person skilled in the art, for example using water, air and / or other liquid or gaseous cooling media, as long as the conditions according to formula (I) are fulfilled.
- f k (x) describes the temperature of the hot strip in ° C after x seconds in the area between the last finishing stand and the reel, corresponding to the cooling section. Methods for determining this temperature are known to those skilled in the art.
- the temperature of the hot strip at the beginning of step (C) is, for example, 750 to 980 ° C, preferably 780 ° C to 950 ° C.
- x describes the cooling time in s.
- the start of the cooling time is defined according to the invention in that the cooling of the hot strip obtained from hot rolling begins with a corresponding cooling medium.
- the end of the cooling time is defined according to the invention in such a way that the point in time at which the flat steel product has reached the temperature at which it is coiled in step (D).
- the cooling time x in the method according to the invention is, for example, 6 to 16 s, preferably 8 to 14 s.
- k is a dimensionless value according to the invention, which is at least 0.24. A preferred upper limit for k according to the invention is 2.00.
- K is preferably 0.26 to 1.20, more preferably 0.26 to 1.10.
- the dimensionless value k according to the invention links the cooling time x with the temperature of the hot strip in ° C after x seconds of cooling.
- a hot strip from which a cold strip, from which optionally a cold strip provided with a protective coating against corrosion and from which a component obtained by reshaping, can be produced, each of which has an advantageous surface, in particular a cold strip is obtained which has the mentioned advantageous AWsq value, measured on the formed cold strip.
- the hot strip which is obtained after step (C) of the process according to the invention generally has a thickness of 1.5 to 10 mm, preferably 2.5 to 8 mm.
- step (C) of the process according to the invention there is a hot strip which has a temperature of 450 to 900 ° C., preferably 480 to 830 ° C. According to the invention, this can preferably be carried out directly in Connection be reeled. Methods and devices for reeling are known per se to the person skilled in the art.
- the method according to the invention has the following step (D):
- step (D) Cold rolling the hot strip from step (C) in at least two cold rolling steps, no recrystallization annealing being carried out between the at least two cold rolling steps in step (D) and the relative thickness reduction in the last cold rolling step being at most 1.40% of the total thickness reduction.
- step (D) The fact that no recrystallization annealing is carried out between the at least two cold rolling steps in step (D) is to be understood to mean that all the cold rolling steps carried out in step (D) are carried out without performing a recrystallization annealing within step (D).
- all the cold rolling steps of step (D) can be carried out in a continuous cold rolling train, in which all the cold rolling steps provided during step (D) follow one another immediately, i.e. without a recrystallization annealing as an intermediate step, between at least two cold rolling steps, on the hot strip of step (C ) can be made.
- the steel flat product obtained in step (C) in coiled form can first be unwound before step (D) of the process.
- Step (D) of the method according to the invention comprises at least two cold rolling steps, preferably step (D) comprises two to five, particularly preferably five, cold rolling steps.
- a reversing stand can also be used in step (D). The rolling stock swings back and forth in this, the rolling gap being reduced after each pass.
- the total reduction in thickness of all cold rolling steps is, for example, 60 to 90%, preferably 70 to 85%. It is essential for step (D) of the method according to the invention that the relative thickness reduction in the last of the at least two cold rolling steps is at most 1.40%, preferably at most 1.35%, of the total thickness reduction.
- the relative reduction in thickness in the last of the at least two cold rolling steps is preferably at least 0.05%.
- the relative thickness reduction mentioned in the last of the at least two cold rolling steps preferably corresponds to an absolute thickness reduction in the last of the at least two cold rolling steps of 0.002 to 0.038 mm.
- the absolute, total thickness reduction of the cold rolling step (D) of the method according to the invention is preferably 1.2 to 8.0 mm, particularly preferably 2.0 to 6.4 mm.
- a cold-rolled, hard-rolled flat steel product is obtained, which is characterized by a special surface quality, in particular by an advantageous Wsq value of less than 0.34 ⁇ m. in particular 0.15 to 0.33 pm.
- This Wsq value can be measured on the hard-rolled cold thin sheet directly after production step (D).
- a cold thin sheet can be obtained which, after being formed into a component, is distinguished by an AWsq value of at most 0.19 pm, in particular 0.00 to 0.185 pm .
- the cold strip obtained according to the invention can then optionally be provided with a coating which protects against corrosion in the following process steps, and can be formed into a component which is distinguished by a special surface texture, in particular by an advantageous AWsq value of at most 0.19 pm, in particular 0.00 to 0 , 185 pm.
- step (D) of the method according to the invention is generally carried out using methods and devices known to the person skilled in the art.
- a cold rolling mill with five stands is particularly preferably used in step (D) of the method according to the invention.
- a work roll with a Wsq value of 0.05 to 0.750 pm, particularly preferably 0.10 to 0.700 pm is used in step (D) of the method according to the invention, preferably in the last step of the rolling process. Furthermore, the rolling in the last step of the rolling process from step (D) of the method according to the invention is preferably carried out at a rolling force of 0.20 kN / mm to 0.60 kN / mm, particularly preferably 0.30 kN / mm to 0.55 / mm kN.
- a cold strip which has a thickness of, for example, 0.20 to 2.0 mm, preferably 0.50 to 1.6 mm.
- step (D) being followed by the following steps:
- the optional step (E) of the method according to the invention comprises cleaning the flat steel product from step (D).
- Step (E) of the process according to the invention can generally be carried out by all processes known to the person skilled in the art.
- the cleaning can be done mechanically by brushing, alkaline by appropriate cleaning agents, for example containing surfactants and / or defoamers, and / or electrolytically, for example by alternately switching the strip as cathode and anode.
- the three methods mentioned can be used individually or usually in combination. If necessary, thermal cleaning can also be carried out on an open flame.
- Step (F) of the method according to the invention comprises a recrystallizing annealing of the flat steel product from step (D) or (E).
- the annealing temperature is preferably 650 to 900 ° C, particularly preferably 750 to 850 ° C.
- the annealing time in s in step (F) of the process according to the invention is preferably 190 to 500 s, particularly preferably 200 to 300 s.
- the dew point present in the annealing furnace in step (F) of the process according to the invention is preferably -60 to +10 ° C, particularly preferably -40 to 0 ° C.
- Step (F) of the method according to the invention can generally be carried out in all devices known to the person skilled in the art.
- Preferred devices for step (F) of the method according to the invention are preferably continuously operating furnaces, for example a continuous annealing furnace of an FBA (fire coating system) or continuous annealing, or non-continuously operating furnaces, for example by means of hood annealing.
- FBA fire coating system
- non-continuously operating furnaces for example by means of hood annealing.
- the optional step (G) of the method according to the invention comprises the application of a protective coating against corrosion to the flat steel product from step (F).
- a protective coating against corrosion is known per se to the person skilled in the art.
- a coating containing zinc is preferably applied as a protective coating against corrosion.
- a zinc-containing coating is preferably applied by a hot-dip process known to the person skilled in the art, by electrolytic deposition or by a coating from the gas phase (CVD or PVD process). Methods for hot-dip coating are described, for example, in US 2015/292072 A1, US 2016/339491 A1, US 2012/0107636 A1 and our own application DE 10 2017 216 572.3.
- Electrolytic processes for the deposition of a zinc-containing layer are also known to the person skilled in the art and are described, for example, in WO 2015/114405.
- CVD or PVD processes are also known to the person skilled in the art.
- Step (G) need not be done.
- the steps are carried out in the order (E), (F), (G), (H).
- a coating which protects against corrosion is preferably applied, comprising 0.1 to 2.0% by weight of Al and optionally 0.1 to 3% by weight of Mg, the remainder being Zn and inevitable impurities.
- the corrosion-protecting coating is further preferably applied by hot dip coating.
- the present invention therefore preferably relates to the method according to the invention, step (G) being carried out by hot-dip coating in a melt bath, containing 0.1 to 2.0% by weight of Al and optionally 0.1 to 3% by weight of Mg, the rest being Zn and inevitable impurities.
- the desired layer thickness or the desired coating weight is set by methods known to the person skilled in the art, for example using scraping nozzles.
- the coating protecting against corrosion is preferably in a coating weight of 20 to 100 g / m 2 , preferably 30 to 80 g / m 2 , in each case on each side of the flat steel product.
- the applied coating which protects against corrosion, can optionally be diffusion annealed, for example at 450 to 550 ° C., so that an Fe content of 0.1 to 15 wt.%, Preferably 4 to 10 wt Corrosion protective coating sets.
- the present invention therefore preferably relates to the method according to the invention, the coating protecting against corrosion being diffusion annealed.
- Step (H) of the method according to the invention comprises the dressing of the flat steel product from step (G).
- step (H) of the method according to the invention can be carried out by all methods known to the person skilled in the art, for example the skin pass according to method step (E) is carried out by textured rollers.
- EBT Electro Beam Texturing
- ECD Electro Chemical Deposition
- EDT-textured rollers are preferably used according to the invention.
- the roughnesses Ra of the work rolls used are preferably less than or equal to 4.0 pm, particularly preferably less than or equal to 2.7 pm, very particularly preferably less than or equal to 2.2 pm. According to the invention, the work roll roughness is preferably at least 0.5 pm.
- Step (I) of the method according to the invention comprises coiling the coated steel flat product from step (H).
- step (I) of the process according to the invention the flat steel product obtained from step (H), provided with a corrosion-protective coating, is coiled, i.e. wound up into a coil.
- the reeling in step (I) of the method according to the invention can be carried out by all methods known to the person skilled in the art.
- the flat steel product obtained by the process according to the invention comprising at least steps (A), (B), (C), (D), (F), (G), (H) and (I) is particularly suitable due to the advantages described above to be further processed by forming into components which are used, for example, as the outer skin of vehicles, in particular automobiles.
- the present invention therefore further relates to a method for producing a component, comprising at least the following steps: (J) providing a flat steel product, optionally with a coating protecting against corrosion, by the method according to the invention, and
- Step (J) of the method according to the invention comprises providing a flat steel product with a coating protecting against corrosion by the method according to the invention.
- This method according to the invention comprises at least steps (A), (B), (C), (D), (F), (G), (H) and (I) as described above.
- step (I) of the method according to the invention the flat steel product emerges in coiled form as a coil. It is therefore preferred according to the invention to unroll the flat steel product obtained from step (I) before step (J) and, if necessary, to straighten and / or clean it.
- the flat steel product passes through a set of processor straightening rollers, in particular for leveling any unevenness, is then cut into boards of the desired shape and, if necessary, treated with methods known to the person skilled in the art, for example oiling, cleaning, etc.
- Step (K) of the method according to the invention comprises forming the flat steel product from step (J) in order to obtain the component.
- Step (K) of the process according to the invention is preferably carried out by cold working.
- the flat steel product which is preferably obtained as a steel strip, is first cut or punched into corresponding sheets or blanks. These sheets or blanks are then placed in an appropriate forming tool and formed under pressure.
- the present invention provides a flat steel product which, owing to the treatment according to the invention preferred for cooling after hot rolling in step (C) and the cold rolling according to the invention in step (D), has a very good waviness, expressed by the Wsq value.
- Another advantage according to the invention is that the advantageous ripple does not change significantly even in a forming process, in particular cold forming.
- the change in the WsqO% value before or after the forming is expressed by the AWsq value.
- the AWsq value of a component obtained by reshaping is preferably at most 0.19 pm, in particular 0.00 to 0.185 pm.
- the present invention also relates to a flat steel product provided with a corrosion-protecting coating, produced by the method according to the invention, comprising at least the steps (A), (B), (C), (D), (F), (G), (H ) and (I).
- the process according to the invention makes it possible to produce a flat steel product which, based on the cooling strategy according to the invention in step (C) and, if appropriate, the cold rolling carried out according to the invention in step (D), has a particularly good surface condition in the deformed state. This is shown in particular by an advantageous AWsq value of the component obtained by deformation of at most 0.19 pm, in particular 0.00 to 0.185 pm.
- the present invention preferably relates to the flat steel product according to the invention, the coating protecting against corrosion not only containing Zn and unavoidable impurities, but also containing 0.1 to 2.0% by weight of Al and optionally 0.1 to 3% by weight of Mg.
- the flat steel product according to the invention is characterized by a particularly low frictional force in a forming tool.
- the frictional force is determined in the context of the present invention in accordance with the multi-frottement test.
- a sheet metal strip measuring 50 x 700 mm is pulled 5 times through a tool at high surface pressure and the friction force in [kN] is determined.
- the tool is a flat jaw with an overlying cylinder with a 20 mm diameter through which the strip is drawn.
- the tool material 1.3342 used has a hardness HRC> 60.
- the test speed is 60 mm / min with a constant normal force F N of 5 kN.
- the test length is 50 mm
- the sample geometry is 50 x 700 mm, whereby the strip sample is cleaned and then oiled with FUCHS RP4107 and 1.5 g / m 2 per side.
- the tool is cleaned, then one and the same metal strip is pulled through 5 times, the tool not being cleaned for each run. The tool is only cleaned after all 5 passes have been completed.
- the friction force is then analyzed using a friction curve.
- the frictional force of the flat steel product according to the invention is preferably less than 7.50 kN, particularly preferably 0.90 to 7.30 kN.
- the present invention also preferably relates to the flat steel product according to the invention, the hot strip having an IMPOC value of at least 2560 A / m 2 , particularly preferably 2560 to 4500 A / m 2 .
- the IMPOC value is measured according to the invention with an IMPOC measuring device (Impulse Magnetic Process Online Controller) from EMG (year of manufacture: 2015).
- the measuring principle is based on the magnetic measurement of a characteristic size of the stray field of a previously magnetized steel strip.
- the IMPOC value obtained in this way shows a good correlation with material properties, including the grain size.
- the basis of the IMPOC system is formed by two identically constructed measuring heads, which are arranged on the top and bottom of the belt.
- Each measuring head contains a magnetizing coil and a highly sensitive magnetic field sensor.
- the measuring cycles consist of a local and periodic magnetization of the moving belt by the two magnetization coils.
- the magnetic field sensors then measure the gradient of the magnetic residual field strength to the top. And bottom of the band.
- the two values of the upper and lower measuring probe are calculated internally and the IMPOC value is measured in A / m 2 .
- the present invention further preferably relates to the flat steel product according to the invention, the hot strip having a grain size of less than 20 pm, preferably 10 to 20 pm.
- the grain size is determined according to DIN EN ISO 643.
- the present invention also preferably relates to the flat steel product according to the invention, where it has a Wsq value of less than 0.34 pm, particularly preferably 0.15 to 0.34 pm, as a cold-rolled cold strip.
- the flat steel product can generally have all thicknesses known to the person skilled in the art, for example 0.2 to 2.0 mm, preferably 0.5 to 1.6 mm, in each case including the coating which protects against corrosion.
- the flat steel product obtained according to the invention in particular a steel strip, preferably has a width of 500 to 2500 mm, particularly preferably 800 to 2000 mm.
- the steel present in the flat steel product according to the invention can generally have any composition.
- a flat steel product is particularly preferably used, comprising a steel containing, in addition to Fe and inevitable impurities (all data in% by weight)
- the present invention also relates to the component produced by the method according to the invention, at least comprising steps (J) and (K).
- the present invention preferably relates to the component according to the invention, it having an AWsq value of at most 0, 190 mpi, particularly preferably 0.00 to 0, 185.
- the present invention also relates to the use of a flat steel product according to the invention or a component according to the invention in the automotive sector, in particular for commercial vehicles, in particular trucks, construction machinery and earth moving vehicles, in the industrial sector, for example as housings or telescopic rails, in the construction sector, for example as facade elements, for household appliances, in the energy sector, in shipbuilding.
- the preliminary strip goes through a cropping shear so that we can enter the finishing line with a straight edge, which here consists of 7 individual stands, the strip being rolled thinner from stand to stand until the desired WB is reached -Thickness of 3.2 to 4.0 mm at a desired finish rolling temperature of 910 to 940 ° C.
- the finished strip then produced runs through the cooling section and is cooled down to a defined reel temperature of 660 to 735 ° C and then wound up into a coil.
- the hot strip then produced was then descaled in a combined pickling cold rolling line using H 2 S0 4 and immediately thereafter on a 5-stand tandem mill at a cold rolling degree of 75 to 82% according to the conditions in Table 2 to give cold strip with a thickness of 0 , 65 to 0.70 mm rolled.
- the cold-rolled cold-rolled strip produced in this way was cleaned in a hot-dip coating system, annealed in a recrystallizing manner under an HNx atmosphere at a holding temperature of 775 to 850 ° C and then in an approximately 455 ° C hot bath of molten zinc with certain proportions of aluminum and optionally immersed magnesium at approximately the same hot strip temperature.
- the strip passed a wiping nozzle in order to adjust the metal coating to a level of approximately 7 ml.
- the then coated strip was then dressed in line at a reroll of 0.5 to 1.7%, trimmed, oiled and then wound up into a ring.
- the properties of the steel strips thus obtained were determined in accordance with Table 3.
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- Organic Chemistry (AREA)
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Abstract
Description
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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PCT/EP2018/074034 WO2020048602A1 (de) | 2018-09-06 | 2018-09-06 | Verzinktes kaltfeinblech mit verbesserten tribologischen eigenschaften ii |
PCT/EP2019/072295 WO2020048772A1 (de) | 2018-09-06 | 2019-08-20 | Verzinktes kaltfeinblech mit verbesserten tribologischen eigenschaften ii |
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EP3847286A1 true EP3847286A1 (de) | 2021-07-14 |
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EP19753410.0A Pending EP3847286A1 (de) | 2018-09-06 | 2019-08-20 | Verzinktes kaltfeinblech mit verbesserten tribologischen eigenschaften ii |
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WO (2) | WO2020048602A1 (de) |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
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ATE535631T1 (de) * | 2007-10-02 | 2011-12-15 | Thyssenkrupp Steel Europe Ag | Verfahren zum herstellen eines stahlbauteils durch warmformen und durch warmformen hergestelltes stahlbauteil |
WO2010130883A1 (fr) | 2009-05-14 | 2010-11-18 | Arcelormittal Investigacion Y Desarrollo Sl | Procede de fabrication d'une bande metallique revetue presentant un aspect ameliore |
WO2014135753A1 (fr) | 2013-03-06 | 2014-09-12 | Arcelormittal Investigacion Y Desarrollo, S.L. | Procédé de réalisation d'une tôle à revêtement znal avec un essorage optimisé, tôle, pièce et véhicule correspondants |
MA39214A1 (fr) | 2014-01-30 | 2017-03-31 | Arcelormittal | Procédé de réalisation de pièces à faible ondulation à partir d'une tôle électrozinguée, pièce et véhicule correspondants |
MY180058A (en) * | 2014-04-30 | 2020-11-20 | Jfe Steel Corp | High-strength steel sheet for containers and method for producing the same |
EP3204530B1 (de) * | 2014-10-09 | 2019-01-09 | ThyssenKrupp Steel Europe AG | Kaltgewalztes und rekristallisierend geglühtes stahlflachprodukt und verfahren zu dessen herstellung |
EP3516084B8 (de) * | 2016-09-20 | 2022-07-20 | ThyssenKrupp Steel Europe AG | Verfahren zum herstellen von stahlflachprodukten und stahlflachprodukt |
DE102017216572A1 (de) | 2017-09-19 | 2019-03-21 | Thyssenkrupp Ag | Schmelztauchbeschichtetes Stahlband mit verbessertem Oberflächenerscheinungsbild und Verfahren zu seiner Herstellung |
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2018
- 2018-09-06 WO PCT/EP2018/074034 patent/WO2020048602A1/de active Application Filing
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2019
- 2019-08-20 WO PCT/EP2019/072295 patent/WO2020048772A1/de unknown
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WO2020048772A1 (de) | 2020-03-12 |
WO2020048602A1 (de) | 2020-03-12 |
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