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1. WO2020115637 - COLD ROLLED AND ANNEALED STEEL SHEET, METHOD OF PRODUCTION THEREOF AND USE OF SUCH STEEL TO PRODUCE VEHICLE PARTS

Publication Number WO/2020/115637
Publication Date 11.06.2020
International Application No. PCT/IB2019/060361
International Filing Date 02.12.2019
IPC
C21D 6/00 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
6Heat treatment of ferrous alloys
C21D 8/02 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
02during manufacturing of plates or strips
C21D 8/04 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
02during manufacturing of plates or strips
04to produce plates or strips for deep-drawing
C21D 9/46 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
46for sheet metals
C22C 38/04 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
04containing manganese
C22C 38/06 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
06containing aluminium
CPC
C21D 1/00
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
C21D 2211/001
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
2211Microstructure comprising significant phases
001Austenite
C21D 2211/004
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
2211Microstructure comprising significant phases
004Dispersions; Precipitations
C21D 2211/005
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
2211Microstructure comprising significant phases
005Ferrite
C21D 6/005
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
6Heat treatment of ferrous alloys
005containing Mn
C21D 8/0236
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
02during manufacturing of plates or strips
0221characterised by the working steps
0236Cold rolling
Applicants
  • ARCELORMITTAL [LU]/[LU]
Inventors
  • DE DIEGO CALDERON, Irène
  • HELL, Jean-Christophe
Agents
  • PLAISANT, Sophie
Priority Data
PCT/IB2018/05962504.12.2018IB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) COLD ROLLED AND ANNEALED STEEL SHEET, METHOD OF PRODUCTION THEREOF AND USE OF SUCH STEEL TO PRODUCE VEHICLE PARTS
(FR) TÔLE D'ACIER LAMINÉE À FROID ET RECUITE, SON PROCÉDÉ DE PRODUCTION ET UTILISATION D'UN TEL ACIER POUR PRODUIRE DES PIÈCES DE VÉHICULE
Abstract
(EN)
A cold rolled and annealed steel sheet comprising by weight: 0.6 < C < 1.3%, 15≤Mn<35%, 6 ≤ Al < 15%, Si ≤ 2.40 %, S ≤ 0.03%, P ≤ 0.1%, N ≤ 0.1%, possibly one or more optional elements chosen among Ni, Cr and Cu in an individual amount of up to 3% and possibly one or more elements chosen among B, Ta, Zr, Nb, V, Ti, Mo, and W in a cumulated amount of up to 2.0%, the remainder of the composition making up of iron and inevitable impurities resulting from the elaboration, the microstructure of said sheet comprising of ordered ferrite between 1% and 10%, optionally of up to 10% of kappa carbides, the remainder being made of austenite, and, the density of said steel sheet being equal or below 7.2 and the FWHM for the austenite matrix is between 0.700 and 1.100.
(FR)
La présente invention concerne une tôle d'acier laminée à froid et recuite comprenant, en poids : 0,6 < C < 1,3 %, 15 ≤ Mn < 35 %, 6 ≤ Al < 15 %, Si ≤ 2,40 %, S ≤ 0,03 %, P ≤ 0,1 %, N ≤ 0,1 %, éventuellement un ou plusieurs éléments facultatifs choisis parmi Ni, Cr et Cu en une quantité individuelle allant jusqu'à 3 % et éventuellement un ou plusieurs éléments choisis parmi B, Ta, Zr, Nb, V, Ti, Mo et W en une quantité cumulée allant jusqu'à 2,0 %, le reste de la composition étant constitué de fer et d'impuretés inévitables résultant de l'élaboration, la microstructure de ladite tôle comprenant une ferrite ordonnée à raison de 1 % à 10 %, éventuellement jusqu'à 10 % de carbures kappa, le reste étant constitué d'austénite, et la densité de ladite tôle d'acier étant inférieure ou égale à 7,2 et la LMH pour la matrice austénitique étant comprise entre 0,700 et 1,100.
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