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1. WO2020058829 - COLD ROLLED AND COATED STEEL SHEET AND A METHOD OF MANUFACTURING THEREOF

Publication Number WO/2020/058829
Publication Date 26.03.2020
International Application No. PCT/IB2019/057795
International Filing Date 17.09.2019
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
Applicants
  • ARCELORMITTAL [LU/LU]; 24-26, Boulevard d'Avranches 1160 Luxembourg, LU
Inventors
  • ALIBEIGI, Samaneh; FR
Agents
  • PLAISANT, Sophie; FR
Priority Data
PCT/IB2018/05725320.09.2018IB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) COLD ROLLED AND COATED STEEL SHEET AND A METHOD OF MANUFACTURING THEREOF
(FR) TÔLE D'ACIER LAMINÉE À FROID ET REVÊTUE ET SON PROCÉDÉ DE FABRICATION
Abstract
(EN)
A cold rolled and heat treated steel sheet having a composition comprising of the following elements 0.13 % ≤ Carbon ≤ 0.18 %,1.1 % ≤ Manganese ≤ 1.8%, 0.5 % ≤ Silicon ≤ 0.9 %, 0.6 % ≤ Aluminum ≤ 1%, 0.002 % ≤ Phosphorus ≤ 0.02 %, 0 % ≤ Sulfur ≤ 0.003 %,0 % ≤ Nitrogen ≤ 0.007% and can contain one or more of the following optional elements 0.05% ≤ Chromium ≤ 1 %, 0.001% ≤ Molybdenum ≤ 0. 5%, 0.001% ≤ Niobium ≤ 0.1%, 0.001% ≤ Titanium ≤ 0.1%, 0.01% ≤ Copper ≤ 2%, 0.01% ≤ Nickel ≤ 3%, 0.0001% ≤ Calcium ≤ 0.005%, 0 % ≤ Vanadium ≤ 0.1%, 0 % ≤ Boron ≤ 0.003%, 0 % ≤ Cerium ≤ 0.1%, 0 % ≤ Magnesium ≦ 0.010%, 0 % ≤ Zirconium ≦ 0.010%, the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet comprising in area fraction, 60 to 75% Ferrite, 20 to 30% Bainite, 10 to 15% Residual Austenite, and 0% to 5% Martensite, wherein the cumulated amounts of Residual Austenite and Ferrite is between 70% and 80%.
(FR)
L'invention concerne une tôle d'acier laminée à froid et traitée thermiquement présentant une composition comprenant les éléments suivants satisfaisant : 0,13 % ≤ carbone ≤ 0,18 %, 1,1 % ≤ manganèse ≤ 1,8 %, 0,5 % ≤ silicium ≤ 0,9 %, 0,6 % ≤ aluminium ≤ 1 %, 0,002 % ≤ phosphore ≤ 0,02 %, 0 % ≤ soufre ≤ 0,003 %, 0 % ≤ azote ≤ 0,007 %, et pouvant contenir un ou plusieurs des éléments facultatifs suivants : 0,05 % ≤ chrome ≤ 1 %, 0,001 % ≤ molybdène ≤ 0,5 %, 0,001 % ≤ niobium ≤ 0,1 %, 0,001 % ≤ titane ≤ 0,1 %, 0,01 % ≤ cuivre ≤ 2 %, 0,01 % ≤ nickel ≤ 3 %, 0,0001 % ≤ calcium ≤ 0,005 %, 0 % ≤ vanadium ≤ 0,1 %, 0 % ≤ bore ≤ 0,003 %, 0 % ≤ cérium ≤ 0,1 %, 0 % ≤ magnésium ≤ 0,010 %, 0 % ≤ zirconium ≦ 0,010 %, la composition restante étant composée de fer et d'impuretés inévitables dues au traitement, la microstructure de ladite tôle d'acier comprenant, en fraction surfacique, 60 à 75 % de ferrite, 20 à 30 % de bainite, 10 à 15 % d'austénite résiduelle et 0 % à 5 % de martensite, les quantités cumulées d'austénite résiduelle et de ferrite étant situées entre 70 % et 80 %.
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