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1. WO2020065422 - HOT ROLLED AND STEEL SHEET AND A METHOD OF MANUFACTURING THEREOF

Publication Number WO/2020/065422
Publication Date 02.04.2020
International Application No. PCT/IB2019/057381
International Filing Date 02.09.2019
IPC
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 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 38/02 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
02containing silicon
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
C22C 38/12 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
12containing tungsten, tantalum, molybdenum, vanadium or niobium
CPC
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 2211/002
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
002Bainite
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 2211/008
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
008Martensite
C21D 8/0226
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
0226Hot rolling
C21D 8/0263
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
0247characterised by the heat treatment
0263following hot rolling
Applicants
  • ARCELORMITTAL [LU]/[LU]
Inventors
  • SARKAR, Sujay
  • MARCIREAU, Guillaume
  • BANO, Xavier
  • OEHLER, Blandine
Agents
  • PLAISANT, Sophie
Priority Data
PCT/IB2018/05754928.09.2018IB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) HOT ROLLED AND STEEL SHEET AND A METHOD OF MANUFACTURING THEREOF
(FR) TÔLE D'ACIER LAMINÉE À CHAUD ET SON PROCÉDÉ DE FABRICATION
Abstract
(EN)
A hot rolled steel sheet having a composition comprising of the elements, expressed in percentage by weight 0.11%≤Carbon≤0.16 %, 1%≤Manganese≤2%, 0.1%≤ Silicon≤0.7%, 0 02%≤Aluminum≤0.1%, 0.15%≤Molybdenum≤0.4%, 0.15%≤Vanadium≤0.4%, 0.002%≤Phosphorus≤0.02%, 0%≤Sulfur≤0.005%, 0%≤Nitrogen≤0.01%, and can contain one or more of the following optional elements 0% ≤ Chromium ≤ 0.5%, 0% ≤ Niobium ≤ 0.05%, 0.0001% ≤ Calcium ≤ 0.005%, 0 % ≤ Boron ≤ 0.001%, 0 % ≤ Magnesium ≤ 0.0010%, 0 % ≤ Titanium ≤ 0.01%, with 0.3% ≤ Mo+V+Nb ≤ 0.6%, the remainder composition being composed of iron and unavoidable impurities, the microstructure of steel sheet comprising in area fraction, 70% to 90% Bainite, 10% to 25% Ferrite wherein the cumulated amounts of Bainite and Ferrite is at least 90% and a cumulated amount of Residual Austenite and Martensite is between 0% and 10 %.
(FR)
L'invention concerne une tôle d'acier laminée à chaud présentant une composition comprenant les éléments, exprimée en pourcentage en poids, 0,11 % ≤ carbone ≤ 0,16 %, 1 % ≤ manganèse ≤ 2 %, 0,1 % ≤ silicium ≤ 0,7 %, 0,02 % ≤ aluminium ≤ 0,1 %, 0,15 % ≤ molybdène ≤ 0,4 %, 0,15 % ≤ vanadium ≤ 0,4 %, 0,002 % ≤ phosphore ≤ 0,02 %, 0 % ≤ soufre ≤ 0,005 %, 0 % ≤ azote ≤ 0,01 %, et pouvant contenir un ou plusieurs des éléments facultatifs suivants : 0 % ≤ chrome ≤ 0,5 %, 0 % ≤ niobium ≤ 0,05 %, 0,0001 % ≤ calcium ≤ 0,005 %, 0 % ≤ bore ≤ 0,001 %, 0 % ≤ magnésium ≤ 0,0010 %, 0 % ≤ titane ≤ 0,01 %, 0,3 % ≤ Mo + V + Nb ≤ 0,6 %, la composition restante étant composée de fer et d'impuretés inévitables, la microstructure de la tôle d'acier comprenant, en fraction de surface, de 70 % à 90 % de bainite, 10 % à 25 % de ferrite, les quantités cumulées de bainite et de ferrite étant d'au moins 90 % et une quantité cumulée d'austénite résiduelle et de martensite étant comprise entre 0 % et 10 %.
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