EP2670870B1 - Procédé de fabrication d'acier à résistance élevée - Google Patents

Procédé de fabrication d'acier à résistance élevée Download PDF

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Publication number
EP2670870B1
EP2670870B1 EP12708776.5A EP12708776A EP2670870B1 EP 2670870 B1 EP2670870 B1 EP 2670870B1 EP 12708776 A EP12708776 A EP 12708776A EP 2670870 B1 EP2670870 B1 EP 2670870B1
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EP
European Patent Office
Prior art keywords
steel
ppm
strip
melt
process according
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Not-in-force
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EP12708776.5A
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German (de)
English (en)
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EP2670870A1 (fr
Inventor
Bernardus Johannes RICHARDS
Benno SCHAAR
Wouter Karel Tiekink
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Tata Steel Ijmuiden BV
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Tata Steel Ijmuiden BV
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • 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
    • 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0426—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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0436—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
    • C21D8/0468—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment between cold rolling steps
    • 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
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/004—Dispersions; Precipitations
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite

Definitions

  • the present invention relates to a process for producing a high strength steel and to steel produced thereby.
  • High strength steels generally rely on carbon in one or more strengthening mechanisms. These mechanisms vary from the formation of pearlite to increase the strength, to the transformation of carbon containing austenite into martensite or bainite, e.g. in a heat treatment or carbon steels or the thermomechanical treatment of dual-phase, TRIP, complex phase steels, bainitic or martensitic steels, or to the formation of very fine carbide precipitates in HSLA steels possibly also resulting in a very fine microstructure as a result of thermomechanical rolling.
  • steel As the carbon content rises, steel has the ability to become harder and stronger through heat treating, but this also makes it less ductile. Regardless of the heat treatment, a higher carbon content reduces weldability. Welding of steels which derive their strength from a transformation product such as dual-phase and TRIP steels may be awkward as the heat input from the welding process may destroy the strength of the steel.
  • EP0556834 relates to a method of producing a high-strength steel sheet which exhibits good workability and which can be formed into a can having high strength by drawing with minimized earing.
  • the properties are achieved by minimising the aluminium content needed for deoxidising and the aluminium in solid solution by keeping the oxygen to a low level.
  • a process for producing a high strength steel comprising:
  • a steel slab or strip can be produced having very clean grain boundaries.
  • the recrystallisation temperature of the steel is much lower than conventional ultra-low carbon steels. This phenomenon is attributed to the extremely low levels of silicon and acid soluble aluminium in the final steel strip or sheet and the presence of finely dispersed manganese and/or iron oxide particles.
  • the annealing temperatures can be reduced as well, leading to a more economical process as well as a reduced tendency for grain growth in the product.
  • the reduced annealing temperatures also prevent sticking in batch annealing processes and reduce the risk of rupture in continuous annealing.
  • a further advantage of the very clean grain boundaries is the strongly reduced susceptibility to corrosion on the grain boundaries. This is especially relevant for the application of the steel in the production of battery cases.
  • the coating systems used in the production of batteries may be leaner (e.g. thinner coating layers or fewer coating layers) when using a substrate with a better corrosion resistance.
  • the phosphorous content should be selected to be not greater than 0.025wt%, preferably at most 0.020%.
  • a suitable maximum for silicon is 0.003%.
  • the manganese content is at least 0.15% to attain a minimum strength increase caused by ODS. A preferable minimum value is 0.3% where the strength increase becomes significant.
  • the maximum content is not limited technically, only economically.
  • a suitable maximum value for the manganese content is 4%, but preferably the manganese content does not exceed 3%.
  • the essential difference with the conventional process for producing an ultra-low-carbon steel strip or sheet is that the ladle treatment of the melt during the vacuum-degassing step, e.g. in an RH-process, does not target a removal of the oxygen by killing it by adding excess aluminium to form alumina particles, but a process wherein the oxygen content of the melt is monitored and controlled, and a dedicated amount of aluminium is added so as to avoid the addition of excess aluminium to the melt which would be present in the final steel as acid soluble aluminium (i.e. in the form of metallic aluminium, not as alumina). It is therefore not an aluminium killed steel in the sense of EN10130.
  • the addition of the precise amount of aluminium ensures that all alumina formed in the ladle treatment is removed from the melt prior to solidification during continuous casting, so that the resulting steel contains hardly any or no aluminium oxide, but instead it contains very small particles which form during the solidification in the mould. These particles are believed to be MnO-MnS rich types. Very small nanoparticles are created in the mould and the slab as well and these are believed to be Fe x O y -particles combined with Mn x O y -S. The generation of these oxide-containing nanoparticles leads to the so-called oxide dispersed strengthening (ODS). There may also be a contribution of the nanoparticles to strength increase by a precipitation hardening mechanism.
  • ODS oxide dispersed strengthening
  • the degassing of the molten steel may be made by any conventional methods such as the RH method, the RH-OB method, or in a vacuum tank degasser.
  • the oxygen content of the liquid steel may be measured using expendable oxygen sensors to measure the melt's oxygen activity.
  • any other deoxidant may be used that can reach this window, i.e. 10 and 100 ppm oxygen activity at approximately 1600 °C, e.g. Ti, Zr, Ca, Sr, Ba etc.
  • the chemistry of the slab or strip results in the formation of finely dispersed oxides, comprising mainly manganese oxides.
  • finely dispersed oxides comprising mainly manganese oxides.
  • relatively large size inclusions act as nuclei for the recrystallisation during annealing of cold-rolled steel, while relatively small size inclusions may act to become appropriate barriers with respect to grain coarsening caused after the recrystallisation to thereby control the grain size of the steel.
  • the carbon content of the steel melt is preferably limited to at most 0.02% because when a higher carbon content is used, the carbon forms carbon monoxide in the manufacturing stage during which the steel is molten, and that CO in turn remains as blow-hole defects in the solidified steel. Moreover, the boiling effect may cause operational problems during casting.
  • the silicon in the solidified steel may be present as silicon oxide and/or as metallic silicon. More preferably the carbon content is limited to 0.008%. Even more preferably the carbon content is limited to at most 0.0045% (i.e. 45 ppm).
  • the steel melt comprises 0.002% carbon and/or at most 0.003% silicon and/or the slab, strip or sheet comprises a total oxygen content of at most 100 ppm.
  • a conventional process for producing an aluminium killed ultra-low-carbon steel strip or sheet results in an oxygen activity or dissolved oxygen content at the end of the ladle treatment of the melt, i.e. immediately prior to casting, of about 3 to 5 ppm.
  • the target oxygen content of the melt at the end of the ladle treatment of the melt is preferably at least 10, or even more preferably 20 ppm.
  • a preferable maximum target oxygen content of the melt at the end of the ladle treatment is 100, or even more preferably 80 ppm. It should be noted that the oxygen content of the melt may increase during the time between the end of the ladle treatment and the casting step.
  • the total oxygen content of the slab or strip may therefore be at most 150 ppm, preferably at most 120 and even more preferably at most 100 ppm.
  • the total oxygen content comprises oxides as well as oxygen in solution.
  • the target oxygen content of the melt at the end of the ladle treatment of the melt is at least 10 ppm. This minimum values ensures that sufficient manganese oxides are formed. To avoid too many large oxides and to avoid too much CO-formation, it is preferable that the target oxygen content is at most 100 ppm. The inventors found that a target oxygen content at the end of the ladle treatment between 10 and 70, provided a good compromise. A more preferable maximum value is at most 60 ppm or even at most 40 ppm. A suitable minimum target oxygen content of the melt at the end of the ladle treatment of the melt is at least 20 ppm. It is believed that the relatively high oxygen content of the steel melt prior to casting results in a low viscosity as a result of the high oxygen potential of the melt.
  • the strip or sheet of ultra-low-carbon steel produced according to the invention comprises at most 0.001% or even at most 0.0005% of acid soluble aluminium and/or at most 0.003% or even 0.002% silicon. Even more preferable the silicon content is at most 0.001%. Ideally, there is no acid soluble aluminium and no silicon in the solidified steel.
  • This process produces a slab or strip suitable for producing a high strength.
  • the mechanical properties of the steel thus produced can be tailored.
  • normal polygonal ferrite grains form during cooling from the austenite region such as on the run-out table of a hot strip mill or after a high temperature annealing treatment.
  • the oxides act as nucleation sites for the formation of ferrite leading to acicular ferrite and/or intragranular polygonal ferrite.
  • This microstructure shows a significantly higher strength than the microstructure consisting of normal polygonal ferrite grains. This effect also occurs during the cooling after welding, and therefore the material to be welded together more easily retains its strength.
  • the acicular ferrite effect can be improved by adding elements such as Ti, Nb and V. Beside the known effects of precipitation hardening and retardation of the phase transformation, these elements will create additional oxides during solidification in the mould and slab. These oxides are small and stable.
  • Ti, Nb and V partly use the MnO-s oxides (in the range of 0.5 to 1.2 ⁇ m) as a surface to grow on during solidification in the mould, thus changing the oxide surface of the original MnO into a surface which is very well suited for the acicular ferrite effect in the slab and hot strip mill.
  • Another way to make the acicular ferrite is to bring small nuclei in the liquid melt before the steel enters the tundish or add the nuclei in the tundish. This is not done by the addition of oxides but by the addition of a "deoxidiser” which is known not to create clusters: e.g. Zr, Ca, Ba, Sr, Ti, Cr, and/or Si. Cluster of oxides will float out of the steel and will make the process unstable in respect of the steel properties (e.g. alumina cluster formation should be avoided). The nuclei will act as a promoter of particle-growth during the subsequent casting and solidification into 0.5 - 1.2 ⁇ sized particles, which can exhibit excellent acicular ferrite properties e.g.
  • Calcium, Ba or Sr which are a vapour at steelmaking temperatures, can be injected by cored wire or by lance and the oxides that are formed are in the size of 0.1 to 1.2 ⁇ m, but fine oxides ( ⁇ 100 nm) can be created as well in this operation.
  • the sulphur content in the steel is preferably at most 120 ppm, but it may be as low as 30 or even 20 ppm to create more pure oxides over oxysulphides during casting and solidification).
  • the deoxidiser is added in the liquid steel, preferably in an RH(-OB) where the oxygen can be tuned easily to the required level and Ca, Ba or Sr can be added in the RH vessel with high precision or can be added in the lance ("KTB" lance), but a simple stirring station or a ladle furnace can be used as well using a lance or cored wire as the injection technique. It would even be possible to do the whole operation in a tundish but smoke, dirt and fumes may create health problems in the tundish area of the caster, so this method is not preferable.
  • Cr can act as an oxide creator (ODS) but does not help very much in the micro alloying effect to strength (Cr ⁇ 0.2 wt%).
  • Ti and Zr also create some C and N micro alloying properties because traces stay dissolved in the steel. Boron can be used when needed but will hardly exhibit any ODS effects as the formation of nitrides takes precedence (BN).
  • a second deoxidiser is added after the oxygen activity at the end of the ladle treatment is set to the required value; this new deoxidiser creates fine particles and, in some cases a small amount of clusters, which will float from the steel to the slag: new deoxidisers such as Zr, Ce, Ti, Ba and even Si may be used to bring the dissolved oxygen to 10 ppm or even lower (e.g. for Zr contents of 50 ppm or lower, the required oxygen activity will in some cases be 3 ppm or lower at the ladle treatment facility.
  • new deoxidisers such as Zr, Ce, Ti, Ba and even Si may be used to bring the dissolved oxygen to 10 ppm or even lower (e.g. for Zr contents of 50 ppm or lower, the required oxygen activity will in some cases be 3 ppm or lower at the ladle treatment facility.
  • CexOy in combination with CeO-s
  • CexOy has the advantage of the high density inclusions density is approximately 6 kg/l, which will prevent flotation of 1 ⁇ m sized particles during ladle treatment.
  • Zr will create ZrOy oxides with a density of about 4 to 5 kg/l and will show a lower tendency of flotation than e.g. alumina, titania or silica/manganese silicates.
  • Ba can be used also to create the nano-sized particles, but Ba exhibits a too high vapour pressure to be added to the steel in a standard way.
  • the second deoxidiser is added by injecting a cored wire under high stirring conditions in a stirring station or ladle furnace treatment.
  • the highly stirred melt in combination with the extra stirring supplied by the vaporizing alloy from the cored wire will create ideal circumstances to make very fine nano sized particles in the oxygen containing steels.
  • a thin slab caster is the preferred option to cast the high strength steels, because of the faster solidification and the temperature levelling after casting and before rolling will create optimal precipitates for strength.
  • a calcium treatment may be avoided because the high oxygen steels do not need any help to prevent clogging at a thin slab caster.
  • a strip caster (cast strip thickness ⁇ 10 mm) can be used and the advantage is here the controlled high solidification rate.
  • the process comprises hot-rolling the slab at a temperature above Ar 3 to obtain a hot-rolled strip.
  • Table 1 gives two soft ULC compositions (with and without B) which show a 50 to 100 MPa ODS strengthening after subjecting it to a conventional cold rolling and annealing treatment.
  • Table 2 shows high strength steel composition by composition in 1/1000 wt.% except C, Ca and N in ppm, composition in mould, except Ot and Oact.
  • Table 1 Composition in 1/1000 wt.% except C, N and B in ppm, composition in mould, except Ot, Oact_RH and Oact.
  • Oact_RH oxygen activity after vacuum degassing
  • Oact tundish oxygen activity
  • Ot slab total oxygen content Table 2. High strength steel composition by composition in 1/1000 wt.% except C, N and Ca in ppm, composition in mould, except Ot and Oact.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Claims (13)

  1. Procédé pour la production d'un acier à résistance élevée, ledit procédé comprenant:
    - la production d'une coulée d'acier dégazée sous vide dans le cadre d'une étape sidérurgique comportant un traitement en poche comprenant, en poids:
    • au plus 0.02% de carbone,
    • au plus 0.003% de silicium,
    • au plus 0.010% d'azote,
    • au plus 0.10% de phosphore,
    • au plus 0.020% de soufre,
    • au moins 0.15% et au plus 4% de manganèse,
    • au plus 0.0045% de bore,
    • au plus 0.03% de titane,
    • au plus 0.1% de niobium,
    • au plus 0.2% de vanadium,
    • au plus 3% de chrome,
    • au plus 6% de nickel,
    • au plus 1.5% de molybdène,
    • au plus 0.005% de calcium,
    • au plus 0.006% de zirconium,
    • au plus 0.005% de baryum,
    • au plus 0.005% de strontium,
    • au plus 0.05% d'éléments de terres rares, par exemple du cérium,
    • le restant étant du fer et des impuretés inévitables,
    - une teneur cible en oxygène de la coulée à la fin du traitement en poche de celle-ci s'obtenant en mesurant la teneur effective en oxygène de la coulée, puis en ajoutant, à la coulée, une quantité appropriée d'aluminium et/ou de zirconium sous une forme appropriée afin de lier l'oxygène, la teneur cible en oxygène de la coulée, à la fin du traitement en poche, étant au plus 100 ppm ;
    - l'adjonction d'un deuxième désoxydant, lorsque l'activité d'oxygène à la fin du traitement en poche atteint au plus 100 ppm, pour la création de fines particules et baisser l'oxygène dissous dans l'acier, dans la poche, jusqu'à 10 ppm, voire moins, le deuxième désoxydant étant un ou plusieurs des suivants: Zr, Ca, Ba, Sr, Ti, Cr et Si ;
    - le moulage de l'acier ainsi produit dans un procédé à coulée continue pour la formation d'une brame ou d'un feuillard ;
    - ledit procédé permettant d'obtenir une brame, un feuillard ou une tôle d'acier à très faible teneur en carbone, comprenant au plus 0.002% d'aluminium soluble dans l'acide et au plus 0.004% de silicium, et une teneur totale en oxygène de 150 ppm au plus.
  2. Un procédé selon une quelconque des revendications précédentes, la brame ou le feuillard d'acier comprenant au plus 0.008% de carbone, de préférence au plus 0.0045%.
  3. Un procédé selon la revendication 1 ou 2, la brame, le feuillard ou la tôle d'acier présentant une teneur totale en oxygène de 100 ppm au plus.
  4. Un procédé selon une quelconque des revendications précédentes, la teneur cible en oxygène de la coulée à la fin du traitement en poche de la coulée étant au moins 10 ppm.
  5. Un procédé selon une quelconque des revendications précédentes, la teneur cible en oxygène de la coulée à la fin du traitement en poche de la coulée étant au plus 70 ppm, et de préférence au plus 60 ppm.
  6. Un procédé selon une quelconque des revendications précédentes, le procédé produisant un feuillard ou une tôle d'acier à très faible teneur en carbone comprenant au plus 0.001% d'aluminium soluble dans l'acide et/ou au plus 0.002% de silicium.
  7. Un procédé selon une quelconque des revendications précédentes, l'acier comprenant au plus 3% de manganèse.
  8. Un procédé selon une quelconque des revendications précédentes, la brame ou le feuillard d'acier comprenant
    • au plus 5 ppm de B, ou l'acier présentant une teneur en B comprise entre 10 et 30 ppm et/ou
    • au plus 0.002% de carbone et/ou
    • de 0.0012 à 0.0030% d'azote.
  9. Un procédé selon une quelconque des revendications précédentes, la brame d'acier étant moulée sous forme de coulées de rames minces ou de bandes en continu.
  10. Un procédé selon une quelconque des revendications précédentes, la brame ou le feuillard d'acier comprenant le laminage à chaud de la brame à une température supérieure à Ar3 pour obtenir un feuillard laminé à chaud.
  11. Un procédé selon la revendication 10, les particules finement dispersées se comportant comme des sites de nucléation pour la formation de ferrite, portant à de la ferrite aciculaire et/ou de la ferrite polygonale intra-granulaire dans le feuillard laminé à chaud.
  12. Un procédé selon la revendication 11, les particules finement dispersées 10 étant sélectionnées parmi les suivants: Zr, Ca, Ba, Sr, Ti, Cr et/ou Si, et formant des oxydes.
  13. Un procédé selon une quelconque des revendications 10 à 12, comprenant
    - le laminage à froid du feuillard laminé à chaud, avec une réduction par laminage à froid comprise entre 40 et 96% pour obtenir un feuillard laminé à froid intermédiaire ;
    - le recuit du feuillard laminé à froid intermédiaire ;
    - en option la soumission du feuillard d'acier laminé à froid à un deuxième laminage à froid jusqu'à l'épaisseur finale de la tôle ;
    - en option le découpage du feuillard en tôles ou en flans.
EP12708776.5A 2011-01-31 2012-01-31 Procédé de fabrication d'acier à résistance élevée Not-in-force EP2670870B1 (fr)

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EP12708776.5A EP2670870B1 (fr) 2011-01-31 2012-01-31 Procédé de fabrication d'acier à résistance élevée

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CN103526112B (zh) * 2013-10-18 2015-09-09 武汉钢铁(集团)公司 一种耐腐蚀桥梁管桩用钢及其生产方法
WO2015113937A1 (fr) * 2014-01-28 2015-08-06 Tata Steel Ijmuiden B.V. Procédé permettant de produire une brame, une bande ou une feuille d'acier à teneur en carbone extrafaible ou à teneur en carbone ultrafaible, et brame, bande ou feuille produites au moyen de ce dernier
CN110699527B (zh) * 2019-10-18 2021-08-27 甘肃酒钢集团宏兴钢铁股份有限公司 热镀锌立式退火炉上下氧含量检测氮气联锁控制系统操作方法
CN112226578A (zh) * 2020-09-15 2021-01-15 包头钢铁（集团）有限责任公司 一种高强稀土大梁钢稀土加入控制方法
CN113774189B (zh) * 2021-08-25 2022-11-11 武汉钢铁有限公司 一种适用于csp产线生产高强钢的炼钢方法
CN115710674B (zh) * 2022-11-15 2023-09-12 沈阳工业大学 一种耐点蚀易焊接用管线钢及其制备方法

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JP3537685B2 (ja) * 1998-10-30 2004-06-14 新日本製鐵株式会社 介在物性欠陥の少ない薄鋼板用鋳片およびその製造方法
FR2833970B1 (fr) * 2001-12-24 2004-10-15 Usinor Demi-produit siderurgique en acier au carbone et ses procedes de realisation, et produit siderurgique obtenu a partir de ce demi-produit, notamment destine a la galvanisation
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EP2459756B1 (fr) * 2009-07-30 2016-05-11 Tata Steel IJmuiden BV Procede de production d'un acier a faible teneur en carbone sous forme de brame, d'une bande ou de tôle

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