WO2022106561A1 - Stahlmaterial und verfahren zu seiner herstellung - Google Patents
Stahlmaterial und verfahren zu seiner herstellung Download PDFInfo
- Publication number
- WO2022106561A1 WO2022106561A1 PCT/EP2021/082190 EP2021082190W WO2022106561A1 WO 2022106561 A1 WO2022106561 A1 WO 2022106561A1 EP 2021082190 W EP2021082190 W EP 2021082190W WO 2022106561 A1 WO2022106561 A1 WO 2022106561A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- steel material
- zinc
- steel
- mass
- strip
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 91
- 239000010959 steel Substances 0.000 title claims abstract description 91
- 239000000463 material Substances 0.000 title claims abstract description 79
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 239000011701 zinc Substances 0.000 claims abstract description 46
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 44
- 238000000576 coating method Methods 0.000 claims abstract description 41
- 239000011248 coating agent Substances 0.000 claims abstract description 36
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 14
- 239000000956 alloy Substances 0.000 claims abstract description 14
- PALQHNLJJQMCIQ-UHFFFAOYSA-N boron;manganese Chemical compound [Mn]#B PALQHNLJJQMCIQ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910000617 Mangalloy Inorganic materials 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 42
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 18
- 239000010955 niobium Substances 0.000 claims description 16
- 239000010936 titanium Substances 0.000 claims description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 239000011651 chromium Substances 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- 239000011572 manganese Substances 0.000 claims description 13
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 238000005246 galvanizing Methods 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 9
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 8
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 8
- 229910052796 boron Inorganic materials 0.000 claims description 8
- 229910052804 chromium Inorganic materials 0.000 claims description 8
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 7
- 229910052748 manganese Inorganic materials 0.000 claims description 7
- 229910052758 niobium Inorganic materials 0.000 claims description 7
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 229910052719 titanium Inorganic materials 0.000 claims description 7
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 6
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 239000011733 molybdenum Substances 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 239000011574 phosphorus Substances 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 239000011593 sulfur Substances 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- 238000003618 dip coating Methods 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052718 tin Inorganic materials 0.000 claims description 2
- 239000011135 tin Substances 0.000 claims description 2
- 238000005097 cold rolling Methods 0.000 claims 1
- 238000005260 corrosion Methods 0.000 description 12
- 238000011161 development Methods 0.000 description 8
- 230000018109 developmental process Effects 0.000 description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 229910052739 hydrogen Inorganic materials 0.000 description 7
- 239000001257 hydrogen Substances 0.000 description 7
- KMWBBMXGHHLDKL-UHFFFAOYSA-N [AlH3].[Si] Chemical compound [AlH3].[Si] KMWBBMXGHHLDKL-UHFFFAOYSA-N 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 229910000734 martensite Inorganic materials 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 229910000789 Aluminium-silicon alloy Inorganic materials 0.000 description 4
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 229910001297 Zn alloy Inorganic materials 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000032798 delamination Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000521 B alloy Inorganic materials 0.000 description 1
- 229910000922 High-strength low-alloy steel Inorganic materials 0.000 description 1
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000004210 cathodic protection Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005244 galvannealing Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
-
- 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
-
- 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
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- 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
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/22—Electroplating: Baths therefor from solutions of zinc
Definitions
- the invention relates to a steel material and a method for its production.
- a plate made of a suitably hardenable steel is heated to a temperature that is so high that the steel structure is partially or completely transformed into austenite. This transformation usually takes place above the austenite transformation temperature A c 3 .
- This A c 3 temperature depends on the steel material and its alloy composition and is usually between 720 and 920°C.
- a steel blank heated in this way is then transferred to a forming tool, in which case it retains its austenitic state, and is brought into the shape of the desired component in this forming tool with one or more forming strokes.
- the forming tool is so cold that when you touch the austenitic blank during forming and then the component obtained by forming, the heat is dissipated so quickly from the steel into the forming tool that the critical hardening speed is exceeded. This converts the structure of the steel from an austenitic structure to a predominantly or completely martensitic structure.
- a certain carbon content of the steel is necessary for this martensite transformation, with the hardening effect, to put it very simply, increasing with the higher the carbon content.
- the hardening effect is based on the fact that, to put it simply, the austenite lattice can dissolve carbon better than the martensite lattice that forms, so that lattice strains or carbide precipitations occur in the martensite lattice, which lead to a distortion of the lattice, which causes the high hardness.
- the finished formed component is heated to such an extent that the steel reaches its austenitic state and is transferred to a hot stamping tool in the austenitic state.
- the form hardening tool is 0.2% larger than the target geometry of the finished component. It is particularly advantageous if, during the hot stamping process, the component is dimensioned in all three spatial directions after cold forming in such a way that it has exactly the size of the desired component in all three spatial directions after heating up due to thermal expansion and, above all, when it is placed in the hot stamping tool exactly the size that is also specified by the form hardening tool.
- the heated component fits perfectly into the hardening mold, is placed in it and the hardening mold closes and clamps the hot component on all sides.
- the form hardening The tool is also cold, so the heat is dissipated from the steel into the tool, also at a rate above the hardening critical rate.
- the austenitic structure is also converted into a martensitic structure during form hardening, with the hardening effect already described.
- the press hardening process is also referred to as a direct process because it hardens and forms directly.
- the form hardening process is also referred to as an indirect process because the hardening no longer carries out any shaping or at least only minor shaping or calibration.
- the tools can usually be cooled and, for example, have liquid cooling.
- components can be achieved which achieve tensile strengths R m of more than 1600 MPa and in particular more than 1800 MPa and even up to or more than 2000 MPa.
- the materials have different designations depending on the manufacturer, but are generally referred to in the prior art as, for example, PHS1500 for grades that can develop a tensile strength of 1500 MPa during press or form hardening or PHS2000 for grades that have a tensile strength of 2000 MPa and be able to train more.
- Metallic anti-corrosion layers are often identified by abbreviations for the materials used, with the abbreviation AS usually standing for aluminum silicon layers, while the abbreviation Z applies to zinc layers or zinc-based layers produced by means of hot dip and ZF stands for zinc layers, which after hot dip coating are treated by a subsequent heat treatment step diffusion-related alloy with the underlying sheet steel, so-called galvannealing layers. These are distinguished by the fact that usually up to 15%, preferably between 8% and 14%, of iron are diffused into the zinc layer. ZE stands for zinc-based layers which were applied using an electrolytic process.
- a Z140 coating therefore means that it is a zinc coating applied by hot dipping with a total of 140 g per m 2 layer coating on both sides of the strip. This means that with Z140, 70 g Zn per m 2 is applied to each side of the strip.
- boron-manganese steels are used as steel materials, i.e. steels alloyed with boron and manganese.
- steels alloyed with boron and manganese is, for example, the most widely used 22MnB5, where the number 22 indicates the carbon content, i.e. 0.22% carbon.
- the object of the invention is to create a steel material which can be produced in a simpler and improved manner, in particular as a high-strength steel material with tensile strengths of more than 2000 MPa.
- the steel material of the present invention is a quench-hardenable steel material composed of a boron-manganese steel having a high carbon content.
- the steel material is a material containing more than 0.30% carbon and in particular a 34MnB5 type steel.
- a composition of the steel material according to the invention is as follows, all data being in mass percentages:
- the remainder is iron and unavoidable impurities from the smelting process.
- a particularly preferred composition of the steel material can be composed as follows, with all data being in percent by mass:
- the remainder is iron and unavoidable impurities from the smelting process.
- the ratio of aluminum, titanium and niobium in relation to nitrogen is advantageously adjusted in order to activate the boron as effectively as possible in the steel material as a hardening element and to be able to achieve correspondingly high tensile strength values.
- the material is covered with a thin layer of zinc alloy, contrary to common practice with galvanized hardenable steels and expert knowledge.
- the zinc alloy coating is extremely thin and is ⁇ 7 ⁇ m per strip side, preferably ⁇ 6 ⁇ m per strip side. This corresponds, for example, to a layer ZF80 (approx. 35 g/m 2 Zn per hinge side).
- the processing is also less expensive than sheets coated with aluminium-silicon layers and it was surprisingly found that heating up takes place more quickly than sheets coated with aluminium-silicon, so that the minimum furnace dwell time is significantly reduced. This is attributed to the fact that the emissivity is significantly better right from the start and it is not necessary to react through the layers or it can be carried out much more quickly.
- a coating weight of less than 50 g/m 2 in particular less than 45 g/m 2 , particularly preferably less than 40 g/m 2 , can advantageously offer reduced friction and thus reduced wear.
- the coating weight can be greater than 20 g/m 2 , in particular greater than 25 g/m 2 , particularly preferably greater than 30 g/m 2 , in order to even out the heating behavior even further and to further positively influence the formation of the oxide layer.
- the invention thus relates to a steel material for the production of high-strength or ultra-high-strength components with a tensile strength R m > 1600 MPa, in particular > 1800 MPa and in particular > 2000 MPa, the steel material being a boron-manganese steel which has a carbon content > 0, 30 M-%, the steel material being hot-rolled or hot-rolled and cold-rolled into a strip with a thickness of 0.5 to 3 mm, the strip having a thin coating of zinc or a zinc-based alloy with a coating weight of ⁇ 50 g/m 2 per strip side of the steel strip.
- the invention relates to a steel material, the steel material having the following alloy
- Composition has (all data in % by mass):
- the remainder is iron and impurities caused by the smelting process.
- the steel material has the following alloy composition (all data in % by mass):
- the remainder is iron and impurities caused by the smelting process.
- the layer weight is ⁇ 45 g/m 2 , in particular ⁇ 40 g/m 2 , particularly preferably ⁇ 30 g/m 2 per side of the steel strip
- the coating consists of zinc or an alloy based on zinc, or is a coating that is converted into a zinc-iron layer on the steel strip by a temperature treatment.
- the invention also relates to a method for producing a steel material, wherein a melt for a boron-manganese steel with a carbon content> 0.3% by mass is melted and then cast, the slab obtained being hot-rolled or hot-rolled and cold-rolled to form a To obtain steel strip with a thickness of 0.5 to 3 mm, the steel strip thus obtained being coated with a coating of zinc or an alloy based on zinc using a galvanizing process, the coating having a coating weight of ⁇ 50 g/m 2 per has hinge side.
- the zinc layer is converted into a zinc-iron layer with a proportion of 8 to 18% by mass of iron, preferably 10 to 15% by mass of iron, by a heat treatment following the galvanizing.
- the zinc layer is deposited by hot dip coating (hot-dip galvanizing), electrolytic galvanizing or a PVD process.
- the coating in addition to zinc, can contain other elements such as aluminum, magnesium, nickel, chromium, tin, iron or a mixture of these, which are deposited together.
- the sum of these elements can be less than 25% by mass, preferably less than 15% by mass, particularly preferably less than 5% by mass. This means that the coating contains at least 75% by mass of zinc.
- the invention relates to a method for producing components, in particular hardened components, from steel material, one of the aforementioned steel materials according to the invention being press-hardened or form-hardened.
- the steel material is heated to a temperature between 700 and 950°C for the purpose of austenitization, optionally maintained at this temperature until it has reached a desired degree of austenitization and then hardened, with the material either being completely deformed before heating or shaped after heating.
- the numbers 1 to 4 each show material with a tensile strength of around 1500 MPa and different types of coating.
- AlSi stands for well-known coatings made of aluminum silicon, also known as llsibor. Uncoated stands for bare material, i.e. uncoated.
- the press hardening process used is also indicated in brackets, with ind standing for the indirect process and dir for the direct hot forming process.
- the designation pc stands for a well-known pre-cooling process in which the steel blank is cooled to a temperature of 400°C to 650°C before forming.
- Numbers 5 to 8 show corresponding material with a tensile strength of around 2000 MPa, again with different types of coating.
- the steel material according to the invention is a blasting material made from a high-carbon or higher-carbon boron-manganese steel, in particular a steel with more than 0.30% by mass of carbon and in particular a 34MnB5.
- the examples according to the invention are designated as number 9 and number 10 in FIG.
- This material has been melted according to the usual analysis of a 34MnB8 and continuously cast and then hot-rolled and, if desired, cold-rolled.
- the steel material has a thickness of 0.5 to 3 mm as a strip or sheet and thus also the blanks cut out of it.
- the hot-rolled or optionally hot and cold-rolled steel material is provided with a zinc coating or a coating with an alloy based on zinc or a zinc-iron layer.
- Electrolytic galvanizing galvanizing using the PVD process or hot-dip galvanizing can be used for galvanizing.
- the zinc layer on both sides of the strip is set to ⁇ 7 ⁇ m, more preferably ⁇ 6 ⁇ m.
- the zinc layer (Z/FVZ) on the steel strip can be converted into a zinc-iron layer (ZF) by heating to temperatures between 400 and 600°C.
- sections are cut out of this sheet steel strip.
- the blanks are placed in a furnace and passed through the furnace and heated above the austenitization temperature (A c 3) in the furnace and, if necessary, kept at this temperature until a desired degree of austenitization, in particular a complete austenitization has taken place.
- the blanks austenitized in this way are then removed and placed in a forming tool in which the blanks are formed with a single stroke and simultaneously quenched by the cold tool and thereby hardened.
- the blanks are fed to a particularly single-stage or multi-stage forming process and formed there into the desired component, with the degree of forming usually increasing with each forming stroke and the products being transferred between the individual forming stations.
- the trimming preferably takes place in the course of the forming.
- the components are fed to a furnace and austenitized in the furnace and removed after the desired degree of austenitization and a Abandoned form hardening tool in which the component is clamped by the flow of the forming tool and thereby quenched and hardened.
- furnaces which are usually adapted to their corresponding cycle rates of the process.
- the two lowest materials here are materials according to the invention which have a very high strength class, namely more than 2000 MPa tensile strength R m . It can be seen that the corrosion protection is less effective compared to thicker zinc layers, but corrosion protection is not the primary task of the thin zinc layer. Above all, the material has significantly less problematic behavior in the furnace than high-strength steel grades that are coated with aluminum silicon (Al-Si) or not (uncoated), since no protective gas atmosphere and no dew point control are necessary and the furnace process window is larger.
- Al-Si aluminum silicon
- the risk of absorbing hydrogen in the PHS furnace is significantly lower than with an AlSi-coated material, and the risk of absorbing hydrogen in the course of welding, cutting, phosphating, cathodic dip painting or possible corrosion is significantly lower than with thicker ones zinc layers. It is surprising that the material can be glued much better than all other materials and is therefore almost predestined for applications in which a glued structure is used and also offers the possibility of using very high-strength steel grades.
- the advantage of the invention is that a steel material is created that has improved heating behavior in the furnace, which allows a shorter residence time in the furnace and thus higher cycle rates.
- the material is less sensitive to hydrogen deposits than normal galvanized material or aluminium-silicon-coated material with a comparable tensile strength, both during austenitizing and in other process steps.
- the thin zinc layer can also ensure the same low coefficients of friction during forming as significantly thicker coatings.
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EP21816016.6A EP4247992A1 (de) | 2020-11-19 | 2021-11-18 | Stahlmaterial und verfahren zu seiner herstellung |
US18/037,150 US20240002965A1 (en) | 2020-11-19 | 2021-11-18 | Steel Material and Method for Its Manufacture |
CN202180081467.1A CN116507752A (zh) | 2020-11-19 | 2021-11-18 | 钢材料及其制造方法 |
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DE102011053939A1 (de) * | 2011-09-26 | 2013-03-28 | Voestalpine Stahl Gmbh | Verfahren zum Erzeugen gehärteter Bauteile |
JP2014015638A (ja) * | 2012-07-06 | 2014-01-30 | Nippon Steel & Sumitomo Metal | 熱間プレス鋼板部材およびその製造方法ならびに熱間プレス用鋼板 |
DE102018114838A1 (de) * | 2018-06-20 | 2019-12-24 | Benteler Automobiltechnik Gmbh | Kraftfahrzeugbauteil aus Vergütungsstahl |
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ES2656070T3 (es) * | 2007-02-23 | 2018-02-23 | Tata Steel Ijmuiden Bv | Procedimiento de conformación termomecánica de un producto final con muy alta resistencia y un producto producido por el mismo |
CN101617059A (zh) * | 2007-02-23 | 2009-12-30 | 克里斯塔尔公司 | 热机械形成具有很高强度的最终产品的方法及由此制备的产品 |
DE102010056264C5 (de) * | 2010-12-24 | 2020-04-09 | Voestalpine Stahl Gmbh | Verfahren zum Erzeugen gehärteter Bauteile |
DE202011107125U1 (de) | 2011-04-13 | 2011-11-30 | Tata Steel Ijmuiden Bv | Warmformbares Band, Blech oder Zuschnitt und warmgeformtes Produkt |
WO2016071399A1 (de) | 2014-11-04 | 2016-05-12 | Voestalpine Stahl Gmbh | Verfahren zum herstellen einer korrosionsschutzbeschichtung für härtbare stahlbleche und korrosionsschutzschicht für härtbare stahlbleche |
JP2017066508A (ja) * | 2015-10-02 | 2017-04-06 | 株式会社神戸製鋼所 | 熱間プレス用亜鉛めっき鋼板および熱間プレス成形品の製造方法 |
DE102015220347B4 (de) | 2015-10-20 | 2018-06-21 | Thyssenkrupp Ag | Verfahren zum Herstellen eines Bauteils für ein Fahrzeug |
WO2017187215A1 (en) | 2016-04-29 | 2017-11-02 | Arcelormittal | Carbon steel sheet coated with a barrier coating |
WO2018096387A1 (en) * | 2016-11-24 | 2018-05-31 | Arcelormittal | Hot-rolled and coated steel sheet for hot-stamping, hot-stamped coated steel part and methods for manufacturing the same |
US20210115527A1 (en) | 2016-11-29 | 2021-04-22 | Tata Steel Ijmuiden B.V. | Method for manufacturing a hot-formed article, and obtained article |
DE102017127987A1 (de) | 2017-11-27 | 2019-05-29 | Muhr Und Bender Kg | Beschichtetes Stahlsubstrat und Verfahren zum Herstellen eines gehärteten Bauteils aus einem beschichteten Stahlsubstrat |
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- 2021-11-18 US US18/037,150 patent/US20240002965A1/en active Pending
- 2021-11-18 WO PCT/EP2021/082190 patent/WO2022106561A1/de active Application Filing
- 2021-11-18 CN CN202180081467.1A patent/CN116507752A/zh active Pending
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DE102011053939A1 (de) * | 2011-09-26 | 2013-03-28 | Voestalpine Stahl Gmbh | Verfahren zum Erzeugen gehärteter Bauteile |
JP2014015638A (ja) * | 2012-07-06 | 2014-01-30 | Nippon Steel & Sumitomo Metal | 熱間プレス鋼板部材およびその製造方法ならびに熱間プレス用鋼板 |
DE102018114838A1 (de) * | 2018-06-20 | 2019-12-24 | Benteler Automobiltechnik Gmbh | Kraftfahrzeugbauteil aus Vergütungsstahl |
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CN116507752A (zh) | 2023-07-28 |
DE102020130543A1 (de) | 2022-05-19 |
EP4247992A1 (de) | 2023-09-27 |
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