EP2031081B1 - Acier en phase double, produit plat à partir d'un tel acier en phase double et son procédé de fabrication - Google Patents
Acier en phase double, produit plat à partir d'un tel acier en phase double et son procédé de fabrication Download PDFInfo
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- EP2031081B1 EP2031081B1 EP07114399A EP07114399A EP2031081B1 EP 2031081 B1 EP2031081 B1 EP 2031081B1 EP 07114399 A EP07114399 A EP 07114399A EP 07114399 A EP07114399 A EP 07114399A EP 2031081 B1 EP2031081 B1 EP 2031081B1
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- European Patent Office
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- dual
- phase steel
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- weight
- strip
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- 229910000885 Dual-phase steel Inorganic materials 0.000 title claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims description 16
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 102
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 90
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 29
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000005098 hot rolling Methods 0.000 claims abstract description 14
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 229910052796 boron Inorganic materials 0.000 claims abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 10
- 238000005097 cold rolling Methods 0.000 claims abstract description 9
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 239000000155 melt Substances 0.000 claims abstract description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 7
- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 6
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 238000002844 melting Methods 0.000 claims abstract description 4
- 230000008018 melting Effects 0.000 claims abstract description 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 4
- 229910052791 calcium Inorganic materials 0.000 claims abstract 3
- 238000003303 reheating Methods 0.000 claims abstract 3
- 230000000717 retained effect Effects 0.000 claims description 24
- 238000000137 annealing Methods 0.000 claims description 16
- 238000000576 coating method Methods 0.000 claims description 15
- 239000011248 coating agent Substances 0.000 claims description 14
- 239000012535 impurity Substances 0.000 claims description 5
- 238000005244 galvannealing Methods 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims 3
- 238000005266 casting Methods 0.000 claims 1
- 239000010936 titanium Substances 0.000 abstract description 15
- 239000011651 chromium Substances 0.000 abstract description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 12
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 abstract description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 6
- 239000010949 copper Substances 0.000 abstract description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 abstract description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 4
- 239000002131 composite material Substances 0.000 abstract description 4
- 239000011733 molybdenum Substances 0.000 abstract description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 3
- 239000011593 sulfur Substances 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 abstract 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract 2
- 239000011575 calcium Substances 0.000 abstract 2
- 238000011109 contamination Methods 0.000 abstract 2
- 230000009977 dual effect Effects 0.000 abstract 2
- 239000011572 manganese Substances 0.000 abstract 2
- 239000011574 phosphorus Substances 0.000 abstract 2
- 238000005496 tempering Methods 0.000 abstract 2
- 238000004804 winding Methods 0.000 abstract 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- 239000010703 silicon Substances 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 72
- 239000010959 steel Substances 0.000 description 72
- 239000000047 product Substances 0.000 description 20
- 239000002244 precipitate Substances 0.000 description 18
- 230000000694 effects Effects 0.000 description 16
- 230000015572 biosynthetic process Effects 0.000 description 9
- 230000001965 increasing effect Effects 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 230000008092 positive effect Effects 0.000 description 5
- 239000002243 precursor Substances 0.000 description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 4
- 238000005275 alloying Methods 0.000 description 4
- 238000005246 galvanizing Methods 0.000 description 4
- 239000011253 protective coating Substances 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910052582 BN Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 235000019362 perlite Nutrition 0.000 description 2
- 239000010451 perlite Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000758 substrate Substances 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
- C22C38/18—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
- 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
- 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
- C22C38/06—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
- C22C38/28—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
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/4998—Combined manufacture including applying or shaping of fluent material
- Y10T29/49988—Metal casting
- Y10T29/49991—Combined with rolling
Definitions
- the invention relates to a dual-phase steel, the structure of which consists essentially of martensite and ferrite or bainite, wherein shares of retained austenite may be present and the dual-phase steel has a tensile strength of more than 950 MPa.
- the invention likewise relates to a flat product produced from such a dual-phase steel and to a process for producing a flat product.
- the generic term "flat product" typically includes steel strips and sheets of the type according to the invention.
- the known steel contains, in addition to iron and the unavoidable impurities (in% by weight) 0.05-0.3% C, up to 1.5% Si, 0.01-0.3% Mn, up to 0.02 % P, 0.02% S, up to 0.01% N and 0, 01 - 3.0% Al.
- the known steel should have a retained austenite content of not more than 7% and have Mg precipitates with a particle diameter of 0.01-5.0 ⁇ m at a distribution determined in more detail in this document.
- the from the EP 1 637 618 A1 known steel to further increase its strength in addition to other optionally added alloying elements also contain contents of Cr and Mo of 0.005 - 5 wt .-% and 0.0051 - 2 wt .-% Cu, the contents of Cu should additionally reduce the risk of breakage ,
- the Martenistanteil of the steel in question is about 5% to 20% of the predominantly martensitic-ferritic microstructure.
- a flat product produced in this way has strengths of at least 500 N / mm 2 and at the same time good formability, without requiring particularly high contents of certain alloying elements.
- JP-A-2000282175 discloses a steel, the structure of which consists of 60-90 vol.% Bainite and the remainder of ferrite, martensite and retained austenite for bodywork.
- the object of the invention was to develop a steel and a flat product produced therefrom which has a strength of at least 950 MPa and good deformability.
- the steel should be one Having a surface finish that allows using a simple manufacturing process, a flat product produced from this steel in the uncoated or provided with a corrosion-protective coating state to deform a complex-shaped component, such as a part of an automobile body.
- a method should also be given that allows in a simple manner to produce in the above-mentioned manner manufactured flat products.
- a the above-mentioned object solving flat product according to claim 21 according to the invention characterized in that it consists of a composite according to the invention and procured steel.
- a steel according to the invention is characterized by high strengths of at least 950, in particular 980 MPa, with regular strengths of 1000 MPa and more being achieved. At the same time, the steel according to the invention has a yield strength of at least 580 MPa, in particular at least 600 MPa, and has an elongation A 80 of at least 10%.
- steel according to the invention is particularly suitable for the production of complex shaped, highly loaded in practical use components, such as those required in the field of bodywork for automobiles.
- the advantageous combination of properties of a steel according to the invention is achieved inter alia by possessing a dual-phase structure despite its high strengths.
- the alloy of a steel according to the invention is composed to have a martensite content of at least 20% to a maximum of 70%.
- residual austenite contents of up to 8% may be advantageous, with generally lower residual austenite contents of not more than 7% or less being preferred.
- the remainder of the microstructure of a dual-phase steel according to the invention consists respectively of ferrite and / or bainite (bainitic ferrite + carbides).
- the high strengths, good elongation properties and optimized surface textures are due to the adjustment of the dual-phase structure according to the invention achieved. This has been made possible by a narrow selection of the individual contents of the alloying elements present in a steel according to the invention besides iron and unavoidable impurities.
- the invention provides a C content of 0.050-0.105% by weight.
- the inventively provided levels of C have been chosen in view of the best possible weldability of the steel.
- the advantageous effect of carbon in a steel according to the invention can be used particularly reliably if the C content of a steel according to the invention is 0.060-0.090% by weight, in particular 0.070-0.080% by weight.
- Si is used in a steel according to the invention to increase the strength by hardening the ferrite or bainite.
- a minimum content of Si of 0.10 wt .-% is provided, the effect of Si is particularly safe when the Si content of a steel according to the invention at least 0.2 wt .-%, in particular at least 0.25 wt .-% is.
- adherence to this upper limit minimizes the risk of grain boundary oxidation.
- the upper limit of the Si content has at the same time been set at 0.6% by weight. In this case, an unfavorable influence of Si on the properties of the steel according to the invention can be avoided with even greater certainty that the Si content of the steel according to the invention is limited to 0.4% by weight, in particular 0.35% by weight.
- the Mn content of a steel according to the invention is in the range of 2.10-2.80% by weight in order to use, on the one hand, the strength-increasing effect and, on the other hand, the positive influence of Mn on martensite formation.
- Mn also has a positive effect with regard to the lowering of the critical cooling rate after annealing, since it hinders the formation of perlite.
- the positive effects of the presence of Mn in a steel according to the invention can be used with particular certainty if the Mn content is at least 2.20% by weight, in particular at least 2.45% by weight.
- Negative effects of Mn on a steel according to the invention such as a reduction in elongation, deterioration of weldability or poorer suitability for hot-dip galvanizing, can be excluded with increased certainty that the Mn content to 2.70 wt .-%, in particular 2, 60 wt .-% is limited.
- Cr also strengthens in a dual-phase steel according to the invention in contents of 0.2-0.8% by weight.
- the effect of Cr is comparable to the effect of Mn.
- the advantageous effects of Cr occur in particular when the Cr content is at least 0.3% by weight, in particular at least 0.55% by weight.
- the Cr content of a steel according to the invention is limited to 0.8% by weight in order to reduce the risk of occurrence of grain boundary oxidation and to avoid a negative influence on the ductility of the steel according to the invention. This is especially ensured when the upper limit of the Chromium content of a steel according to the invention to at most 0.7 wt .-%, in particular 0.65 wt .-%, is set.
- the presence of titanium at levels of at least 0.02% by weight also contributes to increasing the strength of a steel according to the invention by forming fine precipitates of TiC or Ti (C, N) and contributing to grain refining.
- Another positive effect of Ti is the setting of possibly present nitrogen, so that the formation of boron nitrides in the steel according to the invention is prevented. These would have a strong negative impact on the elongation properties and, consequently, on the formability of a flat product according to the invention.
- the presence of Ti thus ensures, in the case of an addition of boron to increase the strength, that the boron can fully develop its effect.
- Ti is added in an amount which is more than 5.1 times the respective N content (ie Ti content> 1.5 (3.4 ⁇ N content)).
- too high Ti contents lead to unfavorably high recrystallization temperatures, which has a negative effect, in particular, when cold-rolled flat products are produced from steel according to the invention, which are finally annealed. Therefore, the upper limit of the Ti content has been limited to 0.10 wt%.
- the positive influence of Ti on the properties of a steel according to the invention can be used particularly reliably if its Ti content is 0.060-0.090% by weight, in particular 0.070-0.085% by weight.
- the strength of the steel according to the invention is also increased by the amounts of B, which are optionally provided according to the invention, of up to 0.002% by weight and, as in the case of the addition of Mn, Cr and Mo in the case of the production of cold strip of steel according to the invention, the critical cooling rate lowered after annealing. Therefore, according to a particularly preferred embodiment of the invention, the B content is at least 0.0005 wt .-%. At the same time, however, excessively high contents of B can reduce the deformability of the steel according to the invention and adversely affect the expression of the dual-phase structure desired according to the invention. Optimized effects of boron can be used in a steel according to the invention in that the B content is limited to 0.0007-0.0016% by weight, in particular 0.0008-0.0013% by weight.
- the inventively optional contents of molybdenum of at least 0.05% by weight also contribute to increasing the strength of a steel according to the invention.
- the presence of Mo does not adversely affect the coatability of the flat product with a metallic coating and its ductility.
- Practical experiments have shown that the positive effects of Mo up to contents of 0.25% by weight, in particular 0.22% by weight, can be used particularly effectively, even from a cost point of view.
- contents of Mo of at least 0.05% by weight have a positive effect on the properties of a steel according to the invention.
- the desired effect of molybdenum occurs a steel according to the invention, in particular if its Mo content is 0.065-0.18% by weight, in particular 0.08-0.13% by weight.
- Mo content is 0.065-0.18% by weight, in particular 0.08-0.13% by weight.
- Cr contents of less than 0.3% by weight it is advantageous to add 0.05-0.22% by weight of Mo to secure the required strength of the steel according to the invention.
- Aluminum is used in the melting of a steel according to the invention for deoxidizing and for setting nitrogen which may be present in the steel.
- Al may be added to the steel according to the invention in contents of less than ⁇ 0.1% by weight, the desired effect of Al occurring particularly safely if its contents in the range of 0.01-0.06 wt .-%, in particular 0.020 - 0.050 wt .-%, are.
- the steel according to the invention may, to further increase its strength, have copper in contents of up to 0.20% by weight.
- a copper content has a particularly favorable effect when it is in the range of 0.08 to 0.12 wt .-%.
- nickel may be added to the steel according to the invention in order to further improve the hardenability and, accordingly, the strength of a steel according to the invention.
- Ca can be used for deoxidation like Al in steelmaking.
- the presence of Ca in amounts of up to 0.005 wt .-%, in particular from 0.002 to 0.004 wt .-%, also favor the formation of a fine-grained structure.
- Nitrogen is allowed in inventive steel only in amounts of up to 0.012 wt .-%, in order to avoid the formation of boron nitrides especially in the simultaneous presence of B.
- the N content is preferably limited to 0.007% by weight.
- the P content is according to the invention preferably limited to ⁇ 0.1, in particular ⁇ 0.02 wt .-%, with particularly good results at levels of less than 0.010 wt .-% can be achieved.
- a dual phase steel composed according to the invention is first melted, then the melt to a precursor, such as slab or thin slab, cast, then reheated the precursor at a hot rolling start temperature of 1100 - 1300 ° C. or held, then the precursor hot rolled at a hot rolling end temperature of 800 - 950 ° C to a hot strip and finally the hot strip at a reel temperature of up to 650 ° C, in particular 500 - 650 ° C, reeled.
- hot strip composed according to the invention reacts insensitive to the change in the coiler temperature and can always achieve strengths which are in the range of 1000 MPa and yield strengths of 750 to 890 MPa.
- the reel temperature can be varied over a wide range in order to influence the respective desired properties and microstructural characteristics in a targeted manner.
- particularly suitable reel temperatures are in the range of 500-650 ° C, with reel temperatures of 530-580 ° C as have proved particularly favorable, since at temperatures of more than 580 ° C with increasing reel temperature, the risk of grain boundary oxidation increases and lying below 500 ° C reel temperatures, the strength of the hot strip increases so much that a subsequent deformation can be difficult.
- the hot strip obtained in the manner according to the invention should remain uncoated or be electrolytically coated with a metallic coating as a hot strip, no annealing of the flat product is required.
- the hot-rolled strip is to be coated with a metallic coating by hot-dip galvanizing, then it is first annealed at a maximum annealing temperature of 600 ° C. and then cooled to the temperature of the coating bath, which may be, for example, a zinc bath. After passing through the zinc bath, the coated hot strip can be conventionally cooled to room temperature.
- cold rolled strips can also be produced from composite steel.
- a composite according to the invention dual-phase steel melted, then cast the melt into a precursor, such as slab or thin slab, then reheated or held the precursor at a hot rolling start temperature of 1100-1300 ° C, then the hot rolled at a final hot rolling temperature of 800-950 ° C to a hot strip, the pre-product obtained hot strip at a reel temperature of up to 650 ° C, in particular 500 - 650 ° C, reeled, then the hot strip cold rolled into a cold strip, then the cold strip annealed at a 700 - 900 ° C amount annealing temperature and finally cooled the cold strip controlled
- the cold strip thus produced can also be provided with a protective coating against corrosion.
- the cold strip to be cold rolled to cold strip is preferably at least 500 ° C, in particular at least 530 ° C or at least 550 ° C, reeled.
- Such cold-rolled Cold rolled strip according to the invention typically has thicknesses of 0, 8-2.5 mm.
- the flat product according to the invention is provided with a metallic protective coating, this can be done, for example, by hot-dip galvanizing, galvannealing or electrolytic coating. If necessary, a pre-oxidation can be carried out before the coating in order to ensure a secure connection of the metallic coating to the respective substrate to be coated.
- the cold strip produced according to the invention remains uncoated or is to be electrolytically coated, an annealing treatment in a continuous annealing anneal takes place as a separate working step.
- the maximum annealing temperatures achieved are in the range of 700-900 ° C at heating rates of 1-50 K / s.
- the annealed cold strip for the targeted setting of the desired property combination according to the invention is preferably cooled in such a way that in the temperature range of 550-650 ° C cooling rates of at least 10 K / s are achieved in order to suppress the formation of perlite.
- the strip can be held for a period of 10-100 s or cooled directly to room temperature at a cooling rate of 0.5-30 K / s.
- the cold strip is to be coated by hot dip galvanizing, then the steps of annealing and coating can be combined.
- the cold strip in continuous sequence through different furnace sections of a fire-coating plant, wherein in the individual furnace sections have different temperatures, the maximum in the range of 700 - 900 ° C, with heating rates in the range of 2 - 100 K / s should be selected.
- the strip is then held at this temperature for 10-200 seconds.
- the strip is then cooled to the temperature of the respective coating bath, which is typically below 500 ° C., which is typically a zinc bath, the cooling rate also being more than 10 K in the temperature range 550-650 ° C. in this case / s should be.
- the cold strip can be kept at the respective temperature for 10 - 100 s. Then the annealed cold strip passes through the respective coating bath, which is preferably a zinc bath. This is followed by either cooling to room temperature to obtain a conventionally hot-dip galvanized cold-rolled strip or rapid heating followed by cooling to room temperature to produce a galvanized cold-rolled strip.
- the respective coating bath which is preferably a zinc bath. This is followed by either cooling to room temperature to obtain a conventionally hot-dip galvanized cold-rolled strip or rapid heating followed by cooling to room temperature to produce a galvanized cold-rolled strip.
- the cold-rolled strip in the coated or uncoated state after the annealing treatment may be subjected to a skin pass rolling in which the skin passages ranging up to 2% are adjusted.
- the hot rolled strips thus obtained were rewound at a coiler temperature of 550 ° C., adjusted to an accuracy of +/- 30 ° C., before being cold rolled to a thickness of 50%, 65% and 70%, respectively from 0.8 mm to 2 mm cold rolled.
- Table 2 shows the microstructural state, the mechanical properties as well as the respectively set cold rolling degrees and strip thicknesses for the cold strips produced in the first test series from melts 1 to 16.
- the hot strips produced from melts 1 to 16 in the manner described above were rewound at a reel temperature lower than 100 ° C, at 500 ° C, at 600 ° C and at 650 ° C.
- the hot strips thus obtained were not intended for cold rolling, but have been supplied as hot strips - possibly after application of a metallic protective coating - the further processing to components.
- Table 1 melt C Si Mn al Not a word Ti Cr B P S N 1 0.087 0.18 2.22 0,007 0,100 0,050 0.60 0.001 0,007 0,004 0.0045 2 0,069 0.28 2.62 0.04 0.092 0,080 0.58 0.0015 0,008 0.0015 0.0031 3 0,095 0.23 2.27 0.031 0.10 0,075 0.62 0.0012 0,013 0,002 0.0051 4 0,089 0.22 2.31 0.034 0,050 0.081 0.64 0.0017 0,012 0.0021 0.0036 5 0.091 0.31 2.52 0.034 0,150 0,052 0.42 0.0011 0.009 0,003 0.0046 6 0,060 0.26 2.15 0,041 0,250 0,051 0.25 0.001 0,012 0.0019 0.0052 7 0,102 0.15 2.26 0,038 0,050 0,090 0.80 0.0018 0.009 0.0021 0.0049 8th 0,065 0.60 2.64 0.032 0,095 0,025 0.45 0.0012 0,0
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- Engineering & Computer Science (AREA)
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Claims (31)
- Acier à deux phases, dont la structure est composée de 20 à 70 % de martensite et de jusqu'à 8 % d'austénite résiduelle et le reste étant de la ferrite et / ou de la bainite, et présente une résistance à la traction d'au moins 950 MPa, ainsi que la composition (en % en poids) suivante :
C : 0,050 - 0,105 %, Si : 0,10 - 0,60 %, Mn : 2,10 - 2,80 %, Cr : 0,20 - 0,80 %, Ti : 0,02 - 0,10 %, B : < 0,0020 %, Mo : < 0,25 %, Al : < 0,10 %, Cu : jusqu'à 0,20 %, Ni : jusqu'à 0,10 %, Ca : jusqu'à 0,005 %, P : jusqu'à 0,2 %, S : jusqu'à 0,01 %, N : jusqu'à 0,012 %, - Acier à deux phases selon la revendication 1, caractérisé en ce que sa limite d'étirage est de 580 MPa au minimum.
- Acier à deux phases selon l'une des revendications précédentes, caractérisé en ce que son allongement A80 est de 10 % au minimum.
- Acier à deux phases selon l'une des revendications précédentes, caractérisé en ce que sa teneur en P est de < 0,1 % en poids, en particulier de < 0,020 % en poids.
- Acier à deux phases selon l'une des revendications précédentes, caractérisé en ce que sa teneur en C est de 0,06 à 0,09 % en poids.
- Acier à deux phases selon l'une des revendications précédentes, caractérisé en ce que sa teneur en Si est de 0,20 à 0,40 % en poids.
- Acier à deux phases selon l'une des revendications précédentes, caractérisé en ce que sa teneur en Mn est de 2,20 à 2,70 % en poids.
- Acier à deux phases selon l'une des revendications précédentes, caractérisé en ce que sa teneur en Cr est de 0,40 à 0,70 % en poids.
- Acier à deux phases selon l'une des revendications précédentes, caractérisé en ce que sa teneur en Ti est de 0,060 à 0,090 % en poids.
- Acier à deux phases selon l'une des revendications précédentes, caractérisé en ce que, en présence de N, la teneur en Ti est de plus de 5,1 fois la teneur en N respective.
- Acier à deux phases selon l'une des revendications précédentes, caractérisé en ce que sa teneur en B est de 0,0005 à 0,002 % en poids.
- Acier à deux phases selon la revendication 11, caractérisé en ce que sa teneur en B est de 0,0007 à 0,0015 % en poids.
- Acier à deux phases selon l'une des revendications précédentes, caractérisé en ce que sa teneur en Mo est de 0,05 à 0,20 % en poids.
- Acier à deux phases selon l'une des revendications précédentes, caractérisé en ce que sa teneur en Cr est < 0,3 % en poids.
- Acier à deux phases selon revendication 13 ou 14, caractérisé en ce que sa teneur en Mo est de 0,065 à 0,150 % en poids.
- Acier à deux phases selon l'une des revendications précédentes, caractérisé en ce que sa teneur en Al est de 0,01 à 0,06 % en poids.
- Acier à deux phases selon l'une des revendications précédentes, caractérisé en ce que sa teneur en Cu est de 0,07 à 0,13 % en poids.
- Acier à deux phases selon l'une des revendications précédentes, caractérisé en ce que sa teneur en S est < 0,003 % en poids.
- Acier à deux phases selon l'une des revendications précédentes, caractérisé en ce que sa teneur en N est < 0,007 % en poids.
- Acier à deux phases selon l'une des revendications précédentes, caractérisé en ce que sa teneur en austénite résiduelle est inférieure à 7 %.
- Produit plat consistant en acier à deux phases constitué selon l'une des revendications 1 à 20.
- Produit plat selon la revendication 21, caractérisé en ce qu'il consiste en un feuillard à chaud seulement laminé à chaud.
- Produit plat selon la revendication 21, caractérisé en ce qu'il consiste en un feuillard à froid obtenu par laminage à froid.
- Produit plat selon l'une des revendications 21 à 23, caractérisé en ce qu'il est pourvu d'un revêtement protecteur, métallique.
- Produit plat selon la revendication 24, caractérisé en ce que le revêtement protecteur, métallique est réalisé par galvanisation à chaud.
- Produit plat selon la revendication 24, caractérisé en ce que le revêtement protecteur, métallique est réalisé par recuit après galvanisation.
- Procédé pour la réalisation d'un feuillard à chaud, qui présente une résistance à la traction de 950 MPa au minimum et une structure à deux phases composée de 20 à 70 % de martensite, jusqu'à 8 % d'austénite résiduelle, le reste étant de la ferrite et / ou de la bainite, ledit procédé comprenant les étapes suivantes :- fusion d'un acier à deux phases, composé selon l'une des revendications 1 à 20,- coulée de l'acier fondu pour l'obtention d'un produit primaire, comme des brames ou des brames minces,- Réchauffage ou maintien du produit primaire à une température de départ de laminage à chaud de 1100 à 1300 °C,- laminage à chaud du produit primaire pour l'obtention d'un feuillard à chaud à une température de laminage à chaud finale de 800 à 950 °C,- bobinage du feuillard à chaud à une température de bobinage de 650 °C au maximum, en particulier de 500 à 650 °C.
- Procédé selon la revendication 27, caractérisé en ce que le feuillard laminé à chaud, obtenu après le bobinage, est transformé en un feuillard à froid, au cours des étapes supplémentaires, suivantes :- laminage à froid du feuillard laminé à chaud pour l'obtention d'un feuillard laminé à froid,- recuit du feuillard laminé à froid à une température rouge de 700 à 900 °C,- refroidissement contrôlé du feuillard à froid recuit.
- Procédé selon revendication 27 ou 28, caractérisé en ce que la température de bobinage est supérieure à 500 °C - 580 °C.
- Procédé selon l'une des revendications 27 à 29, caractérisé en ce que le feuillard à chaud est laminé à froid en un feuillard à froid, à un taux de laminage à froid de 40 à 70 %.
- Procédé selon l'une des revendications 27 à 30, caractérisé en ce que le refroidissement contrôlé est effectué dans une plage de température de 550 à 650 °C, à une vitesse de refroidissement d'au moins 10 K/s.
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL07114399T PL2031081T3 (pl) | 2007-08-15 | 2007-08-15 | Stal dwufazowa, produkt płaski z takiej stali dwufazowej i sposób wytwarzania produktu płaskiego |
AT07114399T ATE516380T1 (de) | 2007-08-15 | 2007-08-15 | Dualphasenstahl, flachprodukt aus einem solchen dualphasenstahl und verfahren zur herstellung eines flachprodukts |
ES07114399T ES2367713T3 (es) | 2007-08-15 | 2007-08-15 | Acero de fase dual, producto plano de un acero de fase dual tal y procedimiento para la fabricación de un producto plano. |
EP07114399A EP2031081B1 (fr) | 2007-08-15 | 2007-08-15 | Acier en phase double, produit plat à partir d'un tel acier en phase double et son procédé de fabrication |
PCT/EP2008/060382 WO2009021898A1 (fr) | 2007-08-15 | 2008-08-07 | Acier biphasé, produit plat constitué d'un tel acier biphasé et procédé de fabrication d'un produit plat |
US12/673,279 US20110220252A1 (en) | 2007-08-15 | 2008-08-07 | Dual-phase steel, flat product made of such a dual-phase steel and process for the production of a flat product |
CN2008801034281A CN101802237B (zh) | 2007-08-15 | 2008-08-07 | 双相钢、由这种双相钢制备的扁钢产品、以及制备扁钢产品的方法 |
JP2010520537A JP5520221B2 (ja) | 2007-08-15 | 2008-08-07 | 2相スチール、2相スチールで作られたフラット製品およびフラット製品の製造方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07114399A EP2031081B1 (fr) | 2007-08-15 | 2007-08-15 | Acier en phase double, produit plat à partir d'un tel acier en phase double et son procédé de fabrication |
Publications (2)
Publication Number | Publication Date |
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EP2031081A1 EP2031081A1 (fr) | 2009-03-04 |
EP2031081B1 true EP2031081B1 (fr) | 2011-07-13 |
Family
ID=38654974
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP07114399A Active EP2031081B1 (fr) | 2007-08-15 | 2007-08-15 | Acier en phase double, produit plat à partir d'un tel acier en phase double et son procédé de fabrication |
Country Status (8)
Country | Link |
---|---|
US (1) | US20110220252A1 (fr) |
EP (1) | EP2031081B1 (fr) |
JP (1) | JP5520221B2 (fr) |
CN (1) | CN101802237B (fr) |
AT (1) | ATE516380T1 (fr) |
ES (1) | ES2367713T3 (fr) |
PL (1) | PL2031081T3 (fr) |
WO (1) | WO2009021898A1 (fr) |
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RU2666392C2 (ru) * | 2013-07-30 | 2018-09-07 | Зальцгиттер Флахшталь Гмбх | СОДЕРЖАЩАЯ КРЕМНИЙ МИКРОЛЕГИРОВАННАЯ ВЫСОКОПРОЧНАЯ МНОГОФАЗНАЯ СТАЛЬ С МИНИМАЛЬНЫМ ПРЕДЕЛОМ ПРОЧНОСТИ ПРИ РАСТЯЖЕНИИ 750 МПа И УЛУЧШЕННЫМИ СВОЙСТВАМИ И СПОСОБ ПРОИЗВОДСТВА ЛЕНТЫ ИЗ ТАКОЙ СТАЛИ |
WO2022184811A1 (fr) | 2021-03-03 | 2022-09-09 | Thyssenkrupp Steel Europe Ag | Produit plat en acier, son procédé de production, et utilisation d'un tel produit plat en acier |
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-
2007
- 2007-08-15 ES ES07114399T patent/ES2367713T3/es active Active
- 2007-08-15 PL PL07114399T patent/PL2031081T3/pl unknown
- 2007-08-15 EP EP07114399A patent/EP2031081B1/fr active Active
- 2007-08-15 AT AT07114399T patent/ATE516380T1/de active
-
2008
- 2008-08-07 JP JP2010520537A patent/JP5520221B2/ja active Active
- 2008-08-07 WO PCT/EP2008/060382 patent/WO2009021898A1/fr active Application Filing
- 2008-08-07 CN CN2008801034281A patent/CN101802237B/zh active Active
- 2008-08-07 US US12/673,279 patent/US20110220252A1/en not_active Abandoned
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2666392C2 (ru) * | 2013-07-30 | 2018-09-07 | Зальцгиттер Флахшталь Гмбх | СОДЕРЖАЩАЯ КРЕМНИЙ МИКРОЛЕГИРОВАННАЯ ВЫСОКОПРОЧНАЯ МНОГОФАЗНАЯ СТАЛЬ С МИНИМАЛЬНЫМ ПРЕДЕЛОМ ПРОЧНОСТИ ПРИ РАСТЯЖЕНИИ 750 МПа И УЛУЧШЕННЫМИ СВОЙСТВАМИ И СПОСОБ ПРОИЗВОДСТВА ЛЕНТЫ ИЗ ТАКОЙ СТАЛИ |
WO2022184811A1 (fr) | 2021-03-03 | 2022-09-09 | Thyssenkrupp Steel Europe Ag | Produit plat en acier, son procédé de production, et utilisation d'un tel produit plat en acier |
Also Published As
Publication number | Publication date |
---|---|
PL2031081T3 (pl) | 2011-11-30 |
JP2010535947A (ja) | 2010-11-25 |
CN101802237B (zh) | 2013-09-04 |
JP5520221B2 (ja) | 2014-06-11 |
US20110220252A1 (en) | 2011-09-15 |
CN101802237A (zh) | 2010-08-11 |
ES2367713T3 (es) | 2011-11-07 |
ATE516380T1 (de) | 2011-07-15 |
EP2031081A1 (fr) | 2009-03-04 |
WO2009021898A1 (fr) | 2009-02-19 |
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