EP1067203A1 - "Procédé de fabrication de bandes en alliage fer-carbonne-manganese, et bandes ainsi produites" - Google Patents
"Procédé de fabrication de bandes en alliage fer-carbonne-manganese, et bandes ainsi produites" Download PDFInfo
- Publication number
- EP1067203A1 EP1067203A1 EP00401860A EP00401860A EP1067203A1 EP 1067203 A1 EP1067203 A1 EP 1067203A1 EP 00401860 A EP00401860 A EP 00401860A EP 00401860 A EP00401860 A EP 00401860A EP 1067203 A1 EP1067203 A1 EP 1067203A1
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- European Patent Office
- Prior art keywords
- strip
- annealing
- casting
- rolling
- carried out
- Prior art date
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- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 230000008569 process Effects 0.000 title claims abstract description 9
- LAUCTMALVHLLAL-UHFFFAOYSA-N [Mn].[C].[Fe] Chemical compound [Mn].[C].[Fe] LAUCTMALVHLLAL-UHFFFAOYSA-N 0.000 title claims abstract description 6
- 229910000914 Mn alloy Inorganic materials 0.000 title claims description 5
- 238000000137 annealing Methods 0.000 claims abstract description 26
- 239000011572 manganese Substances 0.000 claims abstract description 26
- 238000005098 hot rolling Methods 0.000 claims abstract description 22
- 238000005266 casting Methods 0.000 claims abstract description 18
- 238000005097 cold rolling Methods 0.000 claims abstract description 12
- 238000001953 recrystallisation Methods 0.000 claims abstract description 10
- 230000009467 reduction Effects 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- 238000005554 pickling Methods 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 230000001590 oxidative effect Effects 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims description 11
- 229910052759 nickel Inorganic materials 0.000 claims description 9
- 229910001338 liquidmetal Inorganic materials 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- 230000002378 acidificating effect Effects 0.000 abstract 1
- 238000005262 decarbonization Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 25
- 239000010959 steel Substances 0.000 description 25
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 18
- 229910052748 manganese Inorganic materials 0.000 description 17
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 16
- 239000011651 chromium Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 230000009466 transformation Effects 0.000 description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 239000010955 niobium Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000011669 selenium Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910002551 Fe-Mn Inorganic materials 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 2
- 229910052785 arsenic Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 2
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- -1 bore Chemical compound 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 229940082150 encore Drugs 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- 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
- C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
- C21D8/0215—Rapid solidification; Thin strip casting
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
Definitions
- the invention relates to the manufacture of ferrous alloy strips. More specifically, it relates to the manufacture of iron-carbon-manganese alloy strips by direct casting in the form of thin strips.
- Hadfield Fe-Mn steels (11 to 14%) - C (1.1 to 1.4%) which can be described as “steels with a high manganese content”. They present the particularity of having a very high resistance and a hardening capacity under the effect repeated shocks or friction.
- austenitic steels of the type Fe-Mn (15 to 35%) - Al (0 to 10%) - Cr (0 to 20%) - C (0 to 1.5%) which derive simultaneously from Hadfield steels and Fe-Cr-Ni austenitic stainless steels which are gradually replaced nickel with manganese and chromium with aluminum.
- These steels with strong manganese content are characterized by a high work hardening capacity which allows them to associate a high level of resistance with excellent ductility.
- the object of the invention is to propose a method of manufacturing strips ferrous alloys with a high manganese content faster and less expensive than conventionally known method, and making it possible to obtain products of at least also good quality only by this previous method.
- the invention also relates to a strip capable of being produced by this process.
- the invention is primarily based on the use of a method of casting liquid metal directly in the form of a weak strip thickness. This can optionally undergo in-line hot rolling by means of a small installation, the cost of manufacture and use is much lower to that of a band train.
- the elimination of hot rolling on a train bands eliminates the risks of hot cracking during the heating which we have spoken about. Then follow cold rolling, annealing and possibly skin-pass operations, including execution according to the methods which will be specified makes it possible to obtain the properties of the desired product.
- austenitic steels with a high manganese content are characterized by the absence of phase transformation during their cooling.
- one of the functions conventional hot rolling of ferritic, carbon or stainless steels is refinement of the microstructure just before the phase transformation occurs.
- steels with high manganese content which offer the best strength-ductility compromise at the shaping temperature are completely austenitic, at least before deformation, from their solidification until the end of their cooling. So the hot rolling of austenitic steels with a high manganese content is not of interest important metallurgical. Its function is limited to a simple reduction in thickness of the product to obtain a strip capable of being cold rolled. In their case, there is therefore no inconvenience to obtain by casting thin strips a thick strip relatively close to its final thickness, provided that said strip is free of central porosities after pouring. A slight in-line hot rolling, as described, is sufficient to close these possible porosities.
- a steel with a very high manganese content having a composition as previously defined (a typical example of such a composition is Fe - C: 0.55% - Mn: 21.5%) is cast in the form of thin strips of thickness 1.5 to 10 mm, directly from liquid metal.
- a typical example of such a composition is Fe - C: 0.55% - Mn: 21.5%
- the casting between cylinders of strips of thickness of the order of 3 to 4 mm is particularly suitable for implementation of the method according to the invention.
- the strip At its exit from the cylinders, the strip preferably crosses an area such as an enclosure inerted by gas blowing, where it is subjected to a non-oxidizing environment (neutral atmosphere of nitrogen or argon, or even an atmosphere containing a certain proportion of hydrogen to make it reducing), in order to avoid or limit the formation of scale on its surface.
- a non-oxidizing environment neutral atmosphere of nitrogen or argon, or even an atmosphere containing a certain proportion of hydrogen to make it reducing
- the role essential of this hot rolling is to close the porosities likely to have been formed at the heart of the strip during its solidification, and to improve its surface condition by crushing any roughness peaks present on the surface of the strip, in particular when high roughness casting cylinders have been used.
- the reduction rate minimum to apply to the strip during this hot rolling is 10% if we want to close the porosities correctly, typically 20%.
- a rate of up to 60% (obtained in one or more stages) is however possible, in particular if we are dealing with a strip with high surface roughness, or if you want to obtain a final product having a very small thickness.
- the temperature at which this rolling is carried out at hot is of no great importance from a metallurgical point of view, since, as we have says, steel has an austenitic structure at all temperatures and therefore does not undergo phase transformation which could influence the qualitative result of hot rolling.
- the strip can possibly be wound, again at a temperature which hardly matters otherwise than practical, since no significant metallurgical transformation other than growth grains are not likely to occur during the period when the wound strip is cools at low speed.
- the growth of the grains will, however, only have a magnitude limited, the effects of which will be easy to reverse by cold rolling and annealing that will follow.
- the stay of the strip in the form of a reel can be the opportunity to complete the precipitation of carbides, nitrides and carbonitrides.
- the cast strip then possibly hot rolled then undergoes (directly or after a winding-unwinding operation) cold rolling, preferably preceded by an acid pickling (for example with hydrochloric acid) to ensure obtaining a good surface condition of the strip.
- the reduction rate applied during this cold rolling is 10 to 90%, typically of the order of 75%. It is obtained in one or many stages. If we started with a 3 to 4 mm thick cast strip, that we have reduced to 2.5 to 3 mm thick after hot rolling, we typically end up with a cold rolled strip whose thickness is of the order of 0.6-0.8 mm.
- a grain size is obtained recrystallized less than 10 ⁇ m.
- steels with high manganese content concerned by the invention tolerate a wide variation in conditions annealing, due to their high content of alloying elements which slows the growth of grains.
- the strip development process may stop after annealing (after a pickling of the annealed strip), or be supplemented in a conventional manner by a passage to the skin-pass carried out according to usual methods.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Continuous Casting (AREA)
- Metal Rolling (AREA)
- Catalysts (AREA)
Abstract
Description
- on coule sur une machine de coulée une bande mince d'épaisseur 1,5 à 10 mm directement à partir d'un métal liquide de composition en pourcentages pondéraux : C compris entre 0,001 et 1,6% ; Mn compris entre 6 et 30%, Ni ≤ 10% et avec (Mn + Ni) compris entre 16 et 30%; Si ≤ 2,5% ; Al ≤ 6% ; Cr ≤ 10% ; (P + Sn + Sb + As) ≤ 0,2% ; (S + Se + Te) ≤ 0,5% ; (V + Ti + Nb + B + Zr + terres rares) ≤ 3% ; (Mo + W) ≤ 0,5% ; N ≤ 0,3% ; Cu ≤ 5% ; le reste étant du fer et des impuretés résultant de l'élaboration ;
- on lamine à froid ladite bande à un taux de réduction compris entre 10 et 90% en une ou plusieurs étapes ;
- et on effectue un recuit de recristallisation de ladite bande.
- leur teneur en carbone est comprise entre 0,001 et 1,6%, préférentiellement comprise entre 0,2 et 0,8% ; une teneur inférieure à 0,2% oblige à procéder à une décarburation du bain d'acier liquide qui peut être coûteuse à réaliser, en particulier lorsque le manganèse est déjà présent en quantité importante ; de plus, cette teneur minimale de 0,2% permet d'obtenir une interaction entre le carbone et les dislocations : le carbone, en bloquant les dislocations, permet un durcissement supplémentaire par rapport au maclage, et permet d'améliorer la résistance à la traction de 50 à 100 Mpa ; une teneur supérieure à 0,8% rend plus délicate l'optimisation des teneurs en autres éléments d'alliage en vue de l'obtention des propriétés mécaniques les plus favorables ;
- leur teneur en manganèse est comprise entre 6 et 30%, sachant que le total de leurs teneurs en manganèse et nickel est compris entre 16 et 30% et que leur teneur en nickel peut aller jusqu'à 10% ;
- leur teneur en silicium peut aller jusqu'à 2,5%, sachant que cet élément n'est qu'optionnel ;
- leur teneur en aluminium est inférieure à 6% sachant que cet élément n'est qu'optionnel ;
- si du chrome est présent, la teneur en chrome est au maximum de 10% ;
- leur teneur en phosphore peut aller jusqu'à 0,2%, sachant que l'étain, l'antimoine et l'arsenic éventuellement présents sont, de ce point de vue, assimilables au phosphore et comptabilisés avec lui dans la composition de l'acier ; au-delà, on risque d'obtenir des défauts dans les zones ségrégées de la bande ; ces défauts seraient provoqués par des retards à la solidification là où se trouvent des ségrégations ; si on lamine à chaud alors que du métal à l'état liquide est encore présent par endroits dans le produits, il y a, de ce fait, un risque de décohésion de la microstructure ;
- le total de leurs teneurs en soufre, sélénium et tellure peut aller jusqu'à 0,5% ;
- le total de leurs teneurs en vanadium, titane, niobium, bore, tantale et zirconium et terres rares, qui précipitent les nitrures et carbonitrures, peut aller jusqu'à 3% ;
- le total de leurs teneurs en molybdène et tungstène peut aller jusqu'à 0,5% ;
- leur teneur en azote peut aller jusqu'à 0,3%.
- un recuit dit « recuit compact » où la bande est chauffée jusqu'à une température de 900 à 1000°C, voire 1100°C, à une vitesse d'environ 500°C/s, puis est immédiatement refroidie à une vitesse comprise entre 100 et 6000°C/s, qui est fonction de l'épaisseur de la bande et des caractéristiques du fluide de refroidissement ; typiquement, une bande de 0,8 mm d'épaisseur chauffée à 1000°C se refroidit à 200°C/s si elle est trempée à l'hélium et à 5000°C/s si elle est trempée à l'eau ;
- un recuit continu où la bande est portée entre 800 et 850 °C, et maintenue à cette température pendant 60 à 120 s environ ;
- un recuit base où la bande est maintenue entre 700 et 750°C pendant 10 à 90 mn environ ;
Claims (14)
- Procédé de production de bandes en alliage fer-carbone-manganèse, selon lequel :on coule sur une machine de coulée une bande mince d'épaisseur 1,5 à 10 mm directement à partir d'un métal liquide de composition en pourcentages pondéraux : C compris entre 0,001 et 1,6% ; Mn compris entre 6 et 30%, Ni ≤ 10% et avec (Mn + Ni) compris entre 16 et 30% ; Si ≤ 2,5% ; Al ≤ 6% ; Cr ≤ 10% ; (P + Sn + Sb + As) ≤ 0,2% ; (S + Se + Te) ≤ 0,5% ; (V + Ti + Nb + B + Zr + terres rares) ≤ 3% ; (Mo + W) ≤ 0,5% ; N ≤ 0,3% ; Cu ≤ 5%, le reste étant du fer et des impuretés résultant de l'élaboration ;on lamine à froid ladite bande à un taux de réduction compris entre 10 et 90% en une ou plusieurs étapes ;et on effectue un recuit de recristallisation de ladite bande.
- Procédé selon la revendication 1, caractérisé en ce que la teneur en carbone dudit métal liquide est comprise entre 0,2 et 0,8%.
- Procédé selon la revendication 1 ou 2, caractérisé en ce que ladite bande est obtenue par coulée entre deux cylindres horizontaux rapprochés, refroidis intérieurement et mis en rotation en sens inverses.
- Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'entre la coulée de la bande et le laminage à froid, on lamine à chaud ladite bande à un taux de réduction compris entre 10 et 60% en une ou plusieurs étapes.
- Procédé selon la revendication 4, caractérisé en ce que ladite bande traverse une zone sous atmosphère non oxydante entre sa coulée et son laminage à chaud.
- Procédé selon l'une des revendications 4 ou 5, caractérisé en ce que ladite bande subit une opération de décalaminage avant son laminage à chaud.
- Procédé selon l'une des revendications 1 à 6, caractérisé en ce que la bande est bobinée après sa coulée ou son laminage à chaud et débobinée avant son laminage à froid.
- Procédé selon l'une des revendications 1 à 7, caractérisé en ce que ladite bande subit un décapage acide avant son laminage à froid.
- Procédé selon l'une des revendications 1 à 8 caractérisé en ce que ledit recuit de recristallisation est un recuit compact effectué à une température de 900 à 1100°C, immédiatement suivi par un refroidissement de la bande à une vitesse de 100 à 6000°C/s.
- Procédé selon l'une des revendications 1 à 8, caractérisé en ce que ledit recuit de recristallisation est un recuit continu effectué à une température de 800 à 850°C pendant 60 à 120 s.
- Procédé selon l'une des revendications 1 à 8, caractérisé en ce que ledit recuit de recristallisation est un recuit base effectué à une température de 700 à 750°C pendant 10 à 90 mn.
- Procédé selon l'une des revendications 1 à 11, caractérisé en ce que ladite bande est décapée après ledit recuit de recristallisation.
- Procédé selon l'une des revendications 1 à 12, caractérisé en ce que ladite bande subit un passage au skin-pass après le recuit de recristallisation ou le décapage.
- Bande en alliage fer-carbone-manganèse, caractérisée en ce qu'elle est susceptible d'être produite par le procédé selon l'une des revendications 1 à 13.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9908758 | 1999-07-07 | ||
| FR9908758A FR2796083B1 (fr) | 1999-07-07 | 1999-07-07 | Procede de fabrication de bandes en alliage fer-carbone-manganese, et bandes ainsi produites |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1067203A1 true EP1067203A1 (fr) | 2001-01-10 |
| EP1067203B1 EP1067203B1 (fr) | 2004-03-03 |
Family
ID=9547798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00401860A Expired - Lifetime EP1067203B1 (fr) | 1999-07-07 | 2000-06-29 | "Procédé de fabrication de bandes en alliage fer-carbone-manganèse, et bandes ainsi produites" |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US6358338B1 (fr) |
| EP (1) | EP1067203B1 (fr) |
| JP (2) | JP4713709B2 (fr) |
| AT (1) | ATE260992T1 (fr) |
| BR (1) | BR0002544A (fr) |
| CA (1) | CA2314624C (fr) |
| DE (1) | DE60008641T2 (fr) |
| ES (1) | ES2215008T3 (fr) |
| FR (1) | FR2796083B1 (fr) |
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- 2000-06-29 EP EP00401860A patent/EP1067203B1/fr not_active Expired - Lifetime
- 2000-06-29 AT AT00401860T patent/ATE260992T1/de active
- 2000-07-06 BR BR0002544-5A patent/BR0002544A/pt not_active IP Right Cessation
- 2000-07-06 CA CA002314624A patent/CA2314624C/fr not_active Expired - Fee Related
- 2000-07-07 JP JP2000206004A patent/JP4713709B2/ja not_active Expired - Fee Related
- 2000-07-07 US US09/612,415 patent/US6358338B1/en not_active Expired - Fee Related
-
2010
- 2010-12-17 JP JP2010281215A patent/JP2011068997A/ja not_active Withdrawn
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| WO2002101109A1 (fr) | 2001-06-13 | 2002-12-19 | Thyssenkrupp Stahl Ag | Acier et feuillard ou tole d'acier a resistance tres elevee, pouvant etre forme a froid, procede pour produire un feuillard d'acier et utilisations d'un tel acier |
| GB2385862A (en) * | 2002-02-27 | 2003-09-03 | Edgar Allen Ltd | A Cast Austenitic Manganese-Nickel Steel |
| FR2857980A1 (fr) * | 2003-07-22 | 2005-01-28 | Usinor | Procede de fabrication de toles d'acier austenitique fer-carbone-manganese, a haute resistance, excellente tenacite et aptitude a la mise en forme a froid, et toles ainsi produites |
| WO2005019483A1 (fr) * | 2003-07-22 | 2005-03-03 | Usinor | Procede de fabrication de toles d’acier austenitique fer-carbone-manganese, a haute resistance, excellente tenacite et aptitude a la mise en forme a froid, et toles ainsi produites |
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| WO2006056670A3 (fr) * | 2004-11-24 | 2007-07-05 | Arcelor France | Procede de fabrication de toles d'acier austenitique, fer-carbone-manganese a tres hautes caracteristiques de resistance et d'allongement, et excellente homogeneite |
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Also Published As
| Publication number | Publication date |
|---|---|
| ES2215008T3 (es) | 2004-10-01 |
| FR2796083B1 (fr) | 2001-08-31 |
| EP1067203B1 (fr) | 2004-03-03 |
| FR2796083A1 (fr) | 2001-01-12 |
| ATE260992T1 (de) | 2004-03-15 |
| CA2314624A1 (fr) | 2001-01-07 |
| BR0002544A (pt) | 2001-03-13 |
| JP2001049348A (ja) | 2001-02-20 |
| US6358338B1 (en) | 2002-03-19 |
| JP4713709B2 (ja) | 2011-06-29 |
| DE60008641T2 (de) | 2005-02-03 |
| DE60008641D1 (de) | 2004-04-08 |
| JP2011068997A (ja) | 2011-04-07 |
| CA2314624C (fr) | 2009-04-07 |
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