EP3867058A1 - Verfahren zum herstellen eines warmumformbaren stahlflachprodukts - Google Patents
Verfahren zum herstellen eines warmumformbaren stahlflachproduktsInfo
- Publication number
- EP3867058A1 EP3867058A1 EP19791201.7A EP19791201A EP3867058A1 EP 3867058 A1 EP3867058 A1 EP 3867058A1 EP 19791201 A EP19791201 A EP 19791201A EP 3867058 A1 EP3867058 A1 EP 3867058A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- flat product
- coating
- heated
- product
- 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
- 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/012—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of aluminium or an aluminium alloy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/42—Induction heating
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/52—Methods of heating with flames
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/673—Quenching devices for die quenching
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
-
- 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0278—Modifying the physical properties of ferrous metals or ferrous alloys 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
- 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
- C21D8/0421—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing characterised by the working steps
- C21D8/0436—Cold rolling
-
- 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
- C21D8/0447—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing characterised by the heat treatment
-
- 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing
- C21D8/0478—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for drawing, e.g. for deep-drawing involving a particular surface treatment
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
- C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
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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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- 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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
- C23C2/0222—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating in a reactive atmosphere, e.g. oxidising or reducing atmosphere
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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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
- C23C2/0224—Two or more thermal pretreatments
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Definitions
- the invention relates to a method for producing a hot-formable flat steel product, comprising: a production step for producing a cold-rolled tempered steel flat product; a heating step for heating the tempered steel flat product; and a coating step for coating the heated temper steel flat product using a hot dip process.
- a recrystallized annealed raw material is heated to at least the austenitizing temperature of the raw material, then pressed into a shape close to its final dimensions in a metallic press and quenched.
- the recrystallized annealed material is heated by means of a gas-heated furnace, using infrared radiation, by induction or the like.
- a flat steel product made of a boron-manganese steel with a strength greater than or equal to 400 MPa can be produced as the primary material.
- a cold-rolled flat steel product is heated in a furnace to a temperature which is above the austenitizing temperature of the flat steel product and is thereby recrystallized annealed. Then the recrystallized is annealed
- Hot-dip coating system cooled, after which the cooled flat steel product is provided in the hot-dip coating system with a metallic coating or a metallic coating.
- the heating of the flat steel product to a recrystallization temperature that is greater than or equal to the austenitizing temperature and the subsequent cooling of the flat steel product in a cooling zone of a furnace to a temperature of at least 455 ° C. (molten bath temperature) results in losses in the system capacity and higher energy consumption as well as higher wear in the area of the furnace and the melt pool.
- DE 10 2008 035 714 A1 relates to a method for producing a hot-rolled steel sheet for hot press forming.
- a steel slab is heated to a temperature of 1150 ° C to 1250 ° C, the temperature Ar3, at which the formation of ferrite begins to cool, is in the range from 670 ° C to 725 ° C.
- the heated steel slab is rolled in a rough and finish rolling process to produce the steel sheet, the steel sheet being rolled at a temperature Ar3 or higher, and cooled and wound at a temperature of 600 ° C to 700 ° C.
- DE 10 2009 022 231 A1 relates to a method for the surface coating of a strip-shaped steel substrate in a hot-dip coating system.
- the steel substrate is subjected to a recrystallization annealing before coating and then cooled to a temperature which is above the temperature of the molten bath.
- the cooling of the steel substrate is controlled in such a way that the temperature of the weld pool is regulated by immersing the cooled steel substrate.
- DE 1 521 376 A relates to a process for the continuous production of galvanized, deep-drawable steel strips with a low carbon content.
- the process is characterized by the combination of the following, known measures: a) soft annealing of the strips, b) cleaning of the strip surface, c) brief annealing of the strips at a temperature between 500 ° C and 720 ° C in reducing atmosphere, d) cooling to about 480 ° C and e) pulling the strips through the zinc bath.
- EP 2 220 259 A1 relates to a method for producing a hardened component from a hardenable steel.
- the steel strip is subjected to an increase in temperature in an oven and thereby to an oxidizing treatment, so that a superficial oxide layer is produced.
- a coating with a metal or a metal alloy is then carried out.
- the strip is heated to produce an at least partially hardened component and at least partially austenitized and then cooled and thereby hardened.
- To produce a superficial ductile layer the oxides on the surface are partially reduced before coating with a metal or a metal alloy, so that a very thin reduced layer is produced which is located on the residual oxide layer, with an area under the oxide layer in the strip an internal oxidation is in that the steel alloy elements are partially oxidized.
- EP 2 377 965 A2 discloses a method for producing a coated steel sheet.
- An aluminum-coated steel sheet is manufactured using a hot-rolled steel sheet or a cold-rolled steel sheet. Processes are controlled during the manufacture of a hot press product, thereby forming a coating layer on the surface of the steel sheet.
- EP 2 393 953 B1 relates to a method for producing a steel component provided with a metallic coating that protects against corrosion.
- the method comprises the following working steps: a) coating a steel flat product produced from an alloyed tempering steel with an Al coating which contains at least 85% by weight Al and optionally up to 15% by weight Si; b) coating the steel flat product provided with the Al coating with a Zn coating which contains at least 90% by weight of Zn, c) coating the with the Al coating and the Zn coating steel flat product provided thereon with a top layer, the main constituent of which is at least one metallic salt of phosphoric acid or diphosphoric acid and the additional contents of up to 45% of an Al: Zn ratio, where Al at this ratio 0.
- Zn occupies the respective remainder, or may contain compounds of Al and Zn and optionally metal oxides, metal hydroxides and / or sulfur compounds, d) heat treating the flat steel product at a heat treatment temperature which is at least 750 ° C., e) heating the flat steel product to a thermoforming temperature, f) thermoforming the steel component from the heated flat steel product, and g) cooling the thermoformed steel component at a cooling rate which is sufficient to form a tempering or hardening structure.
- An object of the invention is to reduce the energy consumption for the production of hot-formable flat steel products.
- a method for producing a hot-formable flat steel product comprises: a production step for producing a cold-rolled tempered steel flat product; a warming step to Heating the tempered steel flat product; and a coating step for coating the heated temper steel flat product using a hot dip process; wherein the quenched and tempered steel flat product is heated in the heating step to a maximum temperature which is greater than or equal to a temperature of a weld pool used in the hot-dip process and less than an austenitizing temperature of the cold-rolled quenched and tempered steel flat product, and which is heated in the heating step without an intermediate step or after performing an Adjustment of the temperature of the tempered steel flat product to a coating temperature is fed to the coating step.
- the invention is based on the knowledge that the recrystallization of the heated tempered steel flat product supplied to the coating step and the associated adjustment of the mechanical properties of the tempered steel flat product are unnecessary for hot forming, since the properties of the finished tempered steel flat product are set at the end of the hot forming.
- any recrystallizing annealing at a temperature greater than or equal to the austenitizing temperature of the cold-rolled tempered steel flat product, ie T> Ac3 can be dispensed with.
- the cold-rolled tempered steel flat product is only heated to a temperature which is greater than or equal to a temperature of a melt bath used in the hot-dip process and less than an austenitizing temperature of the cold-rolled tempered steel flat product. This saves energy for heating the cold-rolled tempered steel flat product.
- the conventional need to cool the heated tempered steel flat product before coating is also eliminated. So you can Energy consumption for this cooling can be completely saved or at least reduced. This is accompanied by a reduction in the pollutant emissions per ton of the heated flat steel product for the hot forming process which is fed to the coating step, and the biological footprint of this material improves. As a result of the lower temperatures, wear in a furnace used to heat the tempered steel flat product is also less. In addition to cold strip, hot strip can now also be used directly.
- the invention thus essentially consists of simplifying the heating to a one-step process, which is associated with energy savings.
- temperature control (after a possible pre-oxidation at approx. 650 ° C. according to the prior art) can take place, in which the furnace temperature is kept as low as possible in order to be able to reduce the surface area.
- This also applies to surfaces that have not been pre-oxidized, since a slight oxide formation always occurs in gas-fired ovens during the heating phase.
- the purpose of the invention is to save manufacturing costs for press-hardenable steels, i.e. the avoidance of additional costs in order to achieve intermediate mechanical material properties that are basically completely irrelevant.
- the tempered steel flat product is heated in the heating step in such a way that the maximum temperature is less than or equal to 650 ° C.
- the temperature to which the tempered steel flat product is heated in the heating step is just like that
- Preoxidation temperature for thin, reducible layers for example at approx. 650 ° C, well below the austenitizing temperature. So it will be one
- the cat-rolled tempered steel flat product is produced from a boron-manganese steel.
- an oven fired with a fossil fuel in particular oxyfuel oven, or an infrared oven or an induction oven is used in the heating step.
- a gas-fired furnace or a furnace fired with other fossil fuels can be used with the temperature cycles required for this (heating to temperatures if necessary for reduction and then reaching the temperature required for coating).
- an induction furnace due to the short duration of the heating, there is no oxidation of the tempered steel flat product, which is why only heating to the coating temperature is required.
- the heated tempered steel flat product is coated in the coating step with an aluminum-silicon alloy or with gallium.
- the heating step is carried out in such a way that an outer layer of the cold-rolled tempered steel flat product oxidized by the heating step is completely reduced. After this, no residual oxide layer remains on the tempered steel flat product.
- the coated quenched and tempered steel flat product is heated to a temperature which is greater than the austenitizing temperature of the cold-rolled quenched and tempered steel flat product, then pressed into a shape close to the final dimensions and at the same time quenched. This results in hot forming of the coated tempered steel flat product.
- Figure 1 a flowchart of an embodiment for a method according to the invention
- FIG. 1 shows a flowchart of an exemplary embodiment for a method according to the invention for setting a hot-formable flat steel product.
- the method comprises a setting step 10 for setting a cold-rolled tempered steel flat product.
- the cat-rolled tempered steel flat product is made from a boron-manganese steel.
- the method further comprises a heating step 20 for heating the tempered steel flat product.
- the quenched and tempered steel flat product is heated to a maximum temperature which is greater than or equal to a temperature of a weld pool used in the hot-dip process and less than an austenitizing temperature of the cold-rolled quenched and tempered steel flat product.
- the tempered steel flat product is heated in the heating step 20 in such a way that the maximum temperature is less than or equal to approximately 650 ° C.
- an oven fired with a fossil fuel in particular an oxyfuel oven, or an infrared oven or an induction oven is used.
- the heating step 20 is carried out in such a way that an outer layer of the cold-rolled tempered steel flat product oxidized by the heating step is completely reduced.
- the heat-treated flat steel product heated in the heating step 20 is subjected to a coating step 30 for coating the heated steel without an intermediate step or after the reduction temperature (approx. 650 ° C.) of the heat-treated steel flat product has been adjusted to the coating temperature
- Tempered steel flat product fed using a hot dip process The heated tempered steel flat product is coated in the coating step 30 with an aluminum-silicon alloy or with gallium. In the case of an aluminum-silicon coating, only a relatively slight temperature adjustment of the tempered steel flat product is generally required before the coating step 30. In the case of Gl and GA coatings, the tempered steel flat product can be cooled moderately to a Gl or GA temperature level before the coating step 30. This is coated in a subsequent method step 40
- Tempered steel flat product is heated to a temperature which is higher than the austenitizing temperature of the cold-rolled tempered steel flat product, then pressed into a shape close to its final dimensions and quenched at the same time.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatment Of Articles (AREA)
- Coating With Molten Metal (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018217835.6A DE102018217835A1 (de) | 2018-10-18 | 2018-10-18 | Verfahren zum Herstellen eines warmumformbaren Stahlflachprodukts |
| PCT/EP2019/078304 WO2020079200A1 (de) | 2018-10-18 | 2019-10-17 | Verfahren zum herstellen eines warmumformbaren stahlflachprodukts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3867058A1 true EP3867058A1 (de) | 2021-08-25 |
Family
ID=68318858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19791201.7A Pending EP3867058A1 (de) | 2018-10-18 | 2019-10-17 | Verfahren zum herstellen eines warmumformbaren stahlflachprodukts |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3867058A1 (de) |
| DE (1) | DE102018217835A1 (de) |
| WO (1) | WO2020079200A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024256062A1 (de) | 2023-06-12 | 2024-12-19 | Sms Group Gmbh | Verfahren zum herstellen eines beschichteten stahlbands |
| DE102023208949A1 (de) | 2023-06-12 | 2024-12-12 | Sms Group Gmbh | Verfahren zum Herstellen eines beschichteten Stahlbands |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1790422A1 (de) * | 2004-09-15 | 2007-05-30 | Nippon Steel Corporation | Hochfestes teil und verfahren zu dessen herstellung |
| EP2235229B1 (de) * | 2008-01-22 | 2016-06-29 | ThyssenKrupp Steel Europe AG | Verfahren zum beschichten eines 6 - 30 gew. % mn enthaltenden warm- oder kaltgewalzten stahlflachprodukts mit einer metallischen schutzschicht |
| WO2016148045A1 (ja) * | 2015-03-18 | 2016-09-22 | 株式会社神戸製鋼所 | 熱間プレス用鋼板およびその製造方法 |
| EP3214196A1 (de) * | 2014-10-30 | 2017-09-06 | JFE Steel Corporation | Hochfestes stahlblech und verfahren zur herstellung davon |
| EP3476957A1 (de) * | 2016-06-27 | 2019-05-01 | JFE Steel Corporation | Hochfestes galvannealed-stahlblech und herstellungsverfahren dafür |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1521376A1 (de) | 1964-10-30 | 1970-02-12 | Mannesmann Ag | Verfahren zum kontinuierlichen Feuerverzinken von Stahlbaendern mit hoechster Tiefziehfaehigkeit |
| DE102007061489A1 (de) | 2007-12-20 | 2009-06-25 | Voestalpine Stahl Gmbh | Verfahren zum Herstellen von gehärteten Bauteilen aus härtbarem Stahl und härtbares Stahlband hierfür |
| KR101010971B1 (ko) | 2008-03-24 | 2011-01-26 | 주식회사 포스코 | 저온 열처리 특성을 가지는 성형용 강판, 그 제조방법,이를 이용한 부품의 제조방법 및 제조된 부품 |
| KR101008042B1 (ko) | 2009-01-09 | 2011-01-13 | 주식회사 포스코 | 내식성이 우수한 알루미늄 도금강판, 이를 이용한 열간 프레스 성형 제품 및 그 제조방법 |
| DE102009007909A1 (de) | 2009-02-06 | 2010-08-12 | Thyssenkrupp Steel Europe Ag | Verfahren zum Herstellen eines Stahlbauteils durch Warmformen und durch Warmformen hergestelltes Stahlbauteil |
| DE102009022231A1 (de) | 2009-05-22 | 2010-11-25 | Thyssenkrupp Steel Europe Ag | Bandeinlauftemperaturregelung für Feuerverzinkungsanlagen |
| WO2013161831A1 (ja) * | 2012-04-23 | 2013-10-31 | 株式会社神戸製鋼所 | ホットスタンプ用亜鉛めっき鋼板の製造方法、ホットスタンプ用合金化溶融亜鉛めっき鋼板とその製造方法、およびホットスタンプ部品 |
| JP6082451B2 (ja) * | 2015-03-18 | 2017-02-15 | 株式会社神戸製鋼所 | 熱間プレス用鋼板およびその製造方法 |
-
2018
- 2018-10-18 DE DE102018217835.6A patent/DE102018217835A1/de not_active Withdrawn
-
2019
- 2019-10-17 WO PCT/EP2019/078304 patent/WO2020079200A1/de not_active Ceased
- 2019-10-17 EP EP19791201.7A patent/EP3867058A1/de active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1790422A1 (de) * | 2004-09-15 | 2007-05-30 | Nippon Steel Corporation | Hochfestes teil und verfahren zu dessen herstellung |
| EP2235229B1 (de) * | 2008-01-22 | 2016-06-29 | ThyssenKrupp Steel Europe AG | Verfahren zum beschichten eines 6 - 30 gew. % mn enthaltenden warm- oder kaltgewalzten stahlflachprodukts mit einer metallischen schutzschicht |
| EP3214196A1 (de) * | 2014-10-30 | 2017-09-06 | JFE Steel Corporation | Hochfestes stahlblech und verfahren zur herstellung davon |
| WO2016148045A1 (ja) * | 2015-03-18 | 2016-09-22 | 株式会社神戸製鋼所 | 熱間プレス用鋼板およびその製造方法 |
| EP3476957A1 (de) * | 2016-06-27 | 2019-05-01 | JFE Steel Corporation | Hochfestes galvannealed-stahlblech und herstellungsverfahren dafür |
Non-Patent Citations (1)
| Title |
|---|
| See also references of WO2020079200A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102018217835A1 (de) | 2020-04-23 |
| WO2020079200A1 (de) | 2020-04-23 |
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