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CA2514736A1 - Method of producing a cold-rolled band of dual-phase steel with a ferritic/martensitic structure and band thus obtained - Google Patents

Method of producing a cold-rolled band of dual-phase steel with a ferritic/martensitic structure and band thus obtained Download PDF

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Publication number
CA2514736A1
CA2514736A1 CA002514736A CA2514736A CA2514736A1 CA 2514736 A1 CA2514736 A1 CA 2514736A1 CA 002514736 A CA002514736 A CA 002514736A CA 2514736 A CA2514736 A CA 2514736A CA 2514736 A1 CA2514736 A1 CA 2514736A1
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CA
Canada
Prior art keywords
temperature
steel strip
cooling
strip
rolled
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002514736A
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French (fr)
Other versions
CA2514736C (en
Inventor
Antoine Moulin
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USINOR SA
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Individual
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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
    • C21D8/0221—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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/185—Hardening; Quenching with or without subsequent tempering from an intercritical temperature
    • 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
    • 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
    • C21D2211/008—Martensite

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

Abstract

L'invention concerne un procédé de fabrication d'une bande d'acier dualphase à
structure ferrito-martensitique, laminée à froid dans lequel on lamine à chaud une brame dont la composition chimique comprend, en poids 0,010% <= C <= 0,100%
0,050% <= Mn <= 1,0% 0,010% <= Cr <= 1,0% 0,010%
<= Si <= 0,50% 0,001% <= P <= 0,20% 0,010% <= AI
<= 0,10% N <= 0,010% le reste étant du fer et des impuretés résultant de l'élaboration, ledit procédé
comprenant ensuite les étapes consistant à - bobiner la bande à
chaud obtenue à une température comprise entre 550 et 850°C, puis - à
laminer à froid la bande avec un taux de réduction compris entre 60 et 90%, puis - à recuire la bande de façon continue dans le domaine intercritique, et - à la refroidir jusqu'à la température ambiante, en une ou plusieurs étapes, la vitesse de refroidissement entre 600°C et la température ambiante étant comprise entre 100°C/s et 1500°C/s, - et éventuellement à lui faire subir un revenu à une température inférieure à 300°C, les opérations de recuit et de refroidissement étant menées de telle sorte que la bande comprenne finalement de 1 à 15% de martensite, et la bande d'acier ainsi formée. The invention relates to a method for manufacturing a dual-phase steel strip with ferrito-martensitic structure, cold rolled in which a slab is hot rolled, the composition of which chemical includes, by weight 0.010% <= C <= 0.100%
0.050% <= Mn <= 1.0% 0.010% <= Cr <= 1.0% 0.010%
<= If <= 0.50% 0.001% <= P <= 0.20% 0.010% <= AI
<= 0.10% N <= 0.010% the rest being iron and impurities resulting from the production, said process then comprising the steps of - winding the tape to hot obtained at a temperature between 550 and 850 ° C, then - at cold roll the strip with a reduction rate included between 60 and 90%, then - to anneal the strip continuously in the field intercritical, and - to cool it down to the temperature ambient, in one or more steps, the cooling rate between 600 ° C and the ambient temperature being between 100 ° C / s and 1500 ° C / s, - and possibly subject it to a returned to a temperature below 300 ° C, annealing operations and cooling being carried out so that the strip includes finally from 1 to 15% of martensite, and the steel strip as well formed.

Claims (22)

1. Procédé de fabrication d'une bande d'acier dual-phase à structure ferrito-martensitique, laminée à froid caractérisé en ce qu'on lamine à chaud une brame dont la composition chimique comprend, en poids:
0,010% <= C <= 0,100%
0,050% <= Mn <= 1,0%
0,010% <= Cr <= 1,0%
0,010% <= Si <= 0,50%
0,001 % <= P <= 0,20%
0,010% <= AI <= 0,10%
N <= 0,010%
le reste étant du fer et des impuretés résultant de l'élaboration, ledit procédé comprenant ensuite les étapes consistant à:
- bobiner la bande à chaud obtenue à une température comprise entre 550 et 850°C, puis - à laminer à froid la bande avec un taux de réduction compris entre 60 et 90%, puis - à recuire la bande de façon continue dans le domaine intercritique, et - à la refroidir jusqu'à la température ambiante, en une ou plusieurs étapes, la vitesse de refroidissement entre 600°C et la température ambiante étant comprise entre 100°C/s et 1500°C/s, - et éventuellement à lui faire subir un revenu à une température inférieure à 300°C, les opérations de recuit et de refroidissement étant menées de telle sorbe que la bande comprenne finalement de 1 à 15% de martensite. 1. Method for manufacturing a dual-phase steel strip with ferritic structure martensitic, cold rolled, characterized in that a hot rolled slab, the chemical composition of which comprises, by weight:
0.010% <= C <= 0.100%
0.050% <= Mn <= 1.0%
0.010% <= Cr <= 1.0%
0.010% <= If <= 0.50%
0.001% <= P <= 0.20%
0.010% <= AI <= 0.10%
N <= 0.010%
the rest being iron and impurities resulting from the production, said method then comprising the steps consisting in:
- wind the hot strip obtained at a temperature between 550 and 850 ° C, then - cold rolling the strip with a reduction rate of between 60 and 90%, then - annealing the tape continuously in the intercritical domain, and - to cool it down to room temperature, in one or more steps, the cooling rate between 600 ° C and the temperature ambient being between 100 ° C / s and 1500 ° C / s, - and possibly subject it to an income at a temperature less than 300 ° C, the annealing and cooling operations being carried out in such a sorb that the strip finally comprises from 1 to 15% of martensite. 2. Procédé selon la revendication 1, caractérisé en outre en ce que la composition chimique de l'acier comprend:
0,020% <= C <= 0,060%
0,300% <= Mn <= 0,500%
0,010% <= Cr <= 1,0%
0,010% <= Si <= 0,50%
0,010% <= P <= 0,100%
0,010% <= Al <= 0,10%

N <= 0,010%

le reste étant du fer et des impuretés résultant de l'élaboration. 2. Method according to claim 1, further characterized in that the chemical composition of steel includes:
0.020% <= C <= 0.060%
0.300% <= Mn <= 0.500%
0.010% <= Cr <= 1.0%
0.010% <= If <= 0.50%
0.010% <= P <= 0.100%
0.010% <= Al <= 0.10%

N <= 0.010%

the remainder being iron and impurities resulting from processing. 3. Procédé selon l'une ou l'autre des revendications 1 ou 2, caractérisé en ce que l'on lamine la bande à chaud à une température supérieure à
850°C. 3. Method according to either of Claims 1 or 2, characterized in what the hot strip is rolled at a temperature higher than 850 ° C. 4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'on bobine la bande à chaud à une température comprise entre 550 et 750°C. 4. Method according to any one of claims 1 to 3, characterized in what the tape is hot rolled at a temperature between 550 and 750 ° C. 5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'on lamine à froid la bande avec un taux de réduction compris entre 70 et 80%. 5. Method according to any one of claims 1 to 4, characterized in what is cold rolled the strip with a reduction rate included between 70 and 80%. 6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le recuit continu de la bande laminée à froid comprend une phase de montée en température, puis une phase de maintien à une température prédéterminée. 6. Method according to any one of claims 1 to 5, characterized in that the continuous annealing of the cold rolled strip includes a phase temperature rise, then a maintenance phase at a predetermined temperature. 7. Procédé selon la revendication 6, caractérisé en ce que la température de maintien est comprise entre Ac1 et 900°C. 7. Method according to claim 6, characterized in that the temperature of hold is between Ac1 and 900 ° C. 8. Procédé selon la revendication 7, caractérisé en outre en ce que la température de maintien est comprise entre 750 et 850°C. 8. The method of claim 7, further characterized in that the holding temperature is between 750 and 850 ° C. 9. Procédé selon l'une quelconque des revendications 1 à 8, caractérisé en ce que le refroidissement jusqu'à la température ambiante comprend un premier refroidissement lent entre la température de maintien et 500°C, au cours duquel la vitesse de refroidissement est inférieure à 50°C/s, puis un second refroidissement à une vitesse plus élevée et comprise entre 100°C/s et 1500°C/s, jusqu'à la température ambiante. 9. Method according to any one of claims 1 to 8, characterized in what cooling down to room temperature includes a first slow cooling between the holding temperature and 500 ° C, during which the cooling rate is less than 50 ° C / s, then a second cooling at a higher speed and between 100 ° C / s and 1500 ° C / s, up to room temperature. 10. Procédé selon la revendication 9, caractérisé en ce que le second refroidissement est réalisé par trempe à l'eau. 10. Method according to claim 9, characterized in that the second cooling is achieved by water quenching. 11. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le refroidissement est effectuée en une seule opération, à une vitesse de refroidissement comprise entre 100°C/s et 1500°C/s. 11. Method according to any one of claims 1 to 3, characterized in that cooling is done in one operation, at one cooling rate between 100 ° C / s and 1500 ° C / s. 12. Procédé selon la revendication 11, caractérisé en ce que le refroidissement est réalisé par trempe à l'eau. 12. Method according to claim 11, characterized in that the cooling is achieved by water quenching. 13. Bande d'acier dual-phase à structure ferrito-martensitique, laminée à
froid, dont la composition chimique comprend, en poids :
0,010% <= C <= 0,100%
0,050% <= Mn <= 1,0%
0,010% <= Cr <= 1,0%
0,010% <= Si <= 0,50%
0,001% <= P <= 0,20%
0,010% <= Al <= 0,10%
N <= 0,010%
le reste étant du fer et des impuretés résultant de l'élaboration, la bande comportant en outre entre 1 % et 15% de martensite. 13. Dual-phase steel strip with ferrito-martensitic structure, rolled to cold, whose chemical composition includes, by weight:
0.010% <= C <= 0.100%
0.050% <= Mn <= 1.0%
0.010% <= Cr <= 1.0%
0.010% <= If <= 0.50%
0.001% <= P <= 0.20%
0.010% <= Al <= 0.10%
N <= 0.010%
the remainder being iron and impurities resulting from processing, the strip additionally comprising between 1% and 15% martensite. 14. Bande d'acier selon la revendication 13, caractérisée en ce que sa composition chimique comprend en outre :
0,020% <= C <= 0,060%
0,300% <= Mn <= 0,500%
0,010% <= Cr <= 1,0%
0,010% <= Si <= 0,50%
0,010% <= P <= 0,100%
0,010% <= Al <= 0,10%
N <= 0,010%
le reste étant du fer et des impuretés résultant de l'élaboration. 14. Steel strip according to claim 13, characterized in that its chemical composition further includes:
0.020% <= C <= 0.060%
0.300% <= Mn <= 0.500%
0.010% <= Cr <= 1.0%
0.010% <= If <= 0.50%
0.010% <= P <= 0.100%
0.010% <= Al <= 0.10%
N <= 0.010%
the remainder being iron and impurities resulting from processing. 15. Bande d'acier selon l'une ou l'autre des revendications 13 ou 14, caractérisée en ce qu'elle présente une résistance à la traction Rm supérieure à 450 MPa. 15. Steel strip according to either of claims 13 or 14, characterized in that it has a tensile strength Rm greater than 450 MPa. 16. Bande d'acier selon la revendications 15, caractérisée en ce qu'elle présente une résistance à la traction Rm supérieure à 500 MPa. 16. Steel strip according to claim 15, characterized in that it has a tensile strength Rm greater than 500 MPa. 17. Bande d'acier selon la revendication 15, caractérisée en outre en ce qu'elle présente une résistance à la traction Rm supérieure à 600 MPa. 17. Steel strip according to claim 15, further characterized in that that it has a tensile strength Rm greater than 600 MPa. 18. Bande d'acier selon l'une quelconque des revendications 13 à 17, caractérisée en ce qu'elle présente un coefficient d'anisotropie moyen r supérieur à 1,1. 18. Steel strip according to any one of claims 13 to 17, characterized in that it has a mean anisotropy coefficient r greater than 1.1. 19. Bande d'acier selon la revendication 18, caractérisée en outre en ce qu'elle présente un coefficient d'anisotropie moyen r supérieur à 1,3. 19. Steel strip according to claim 18, further characterized in that that it has an average anisotropy coefficient r greater than 1.3. 20. Bande d'acier selon l'une quelconque des revendications 13 à 19, caractérisée en ce qu'elle comporte en outre entre 1 % et 10% de martensite. 20. Steel strip according to any one of claims 13 to 19, characterized in that it further comprises between 1% and 10% of martensite. 21. Bande d'acier selon la revendication 20, caractérisée en ce qu'elle comporte en outre entre 5% et 8% de martensite. 21. Steel strip according to claim 20, characterized in that it additionally contains between 5% and 8% martensite. 22. Utilisation d'une bande d'acier selon l'une quelconque des revendications 13 à 21, pour la fabrication de pièces pour automobile par emboutissage profond. 22. Use of a steel strip according to any one of claims 13 to 21, for the production of automotive parts by stamping deep.
CA2514736A 2003-02-05 2004-01-30 Method of producing a cold-rolled band of dual-phase steel with a ferritic/martensitic structure and band thus obtained Expired - Lifetime CA2514736C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0301358A FR2850671B1 (en) 2003-02-05 2003-02-05 PROCESS FOR MANUFACTURING A DUAL-PHASE STEEL BAND HAVING A COLD-ROLLED FERRITO-MARTENSITIC STRUCTURE AND A BAND OBTAINED THEREFROM
FR03/01358 2003-02-05
PCT/FR2004/000209 WO2004079022A1 (en) 2003-02-05 2004-01-30 Method of producing a cold-rolled band of dual-phase steel with a ferritic/martensitic structure and band thus obtained

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CA2514736A1 true CA2514736A1 (en) 2004-09-16
CA2514736C CA2514736C (en) 2012-12-04

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US (1) US20060144482A1 (en)
EP (1) EP1592816B1 (en)
JP (1) JP4528769B2 (en)
KR (1) KR101091021B1 (en)
CN (1) CN100465299C (en)
BR (1) BRPI0407236A (en)
CA (1) CA2514736C (en)
ES (1) ES2831249T3 (en)
FR (1) FR2850671B1 (en)
HU (1) HUE052206T2 (en)
MX (1) MXPA05008189A (en)
PL (1) PL206109B1 (en)
RU (1) RU2341566C2 (en)
UA (1) UA87454C2 (en)
WO (1) WO2004079022A1 (en)
ZA (1) ZA200505968B (en)

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