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1. WO2022009032 - HEAT TREATED COLD ROLLED STEEL SHEET AND A METHOD OF MANUFACTURING THEREOF

Publication Number WO/2022/009032
Publication Date 13.01.2022
International Application No. PCT/IB2021/055898
International Filing Date 01.07.2021
IPC
C21D 8/02 2006.1
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
C22C 38/00 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
C22C 38/02 2006.1
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 38/06 2006.1
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 38/22 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
22with molybdenum or tungsten
C22C 38/26 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
26with niobium or tantalum
Applicants
  • ARCELORMITTAL [LU]/[LU]
Inventors
  • FAN, Dongwei
  • GIRINA, Olga
Agents
  • PLAISANT, Sophie
Priority Data
PCT/IB2020/05633006.07.2020IB
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) HEAT TREATED COLD ROLLED STEEL SHEET AND A METHOD OF MANUFACTURING THEREOF
(FR) TÔLE D'ACIER LAMINÉE À FROID ET TRAITÉE THERMIQUEMENT ET PROCÉDÉ DE FABRICATION DE CELLE-CI
Abstract
(EN) A cold rolled steel sheet having a composition comprising of 0.05 % ≤ Carbon ≤ 0.15 %, 1.8% ≤ Manganese ≤ 2.7%, 0.1% ≤ Silicon ≤ 1%,0.01% ≤ Aluminum ≤ 0.8%,0.1% ≤ Chromium ≤ 0.9%,0% ≤ Phosphorus ≤ 0.09%,0.0001% ≤ Titanium ≤ 0.1%,0.0005% ≤ Boron ≤ 0.003%, 0.01% ≤ Niobium ≤ 0.1%, 0 % ≤ Sulfur ≤ 0.09 %, 0 % ≤ Nitrogen ≤ 0.09%, 0% ≤ Vanadium ≤ 0.2%, 0%≤Molybdenum ≤0.2%, 0%≤ Nickel ≤2%, 0% ≤ Copper ≤ 2%, 0% ≤ Calcium ≤ 0.005%, 0% ≤ Cerium ≤ 0.1%, 0% ≤ Magnesium ≦ 0.05%, 0% ≤ Zirconium ≦ 0.05%, the remainder being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet comprising in area fraction, 40% to 60% martensite, 15 to 40% of inter-critical ferrite, a cumulated amount of 10 to 35% of transformed ferrite and bainite and 0% to 5% of residual austenite.
(FR) Tôle d'acier laminée à froid ayant une composition comprenant 0,05 % ≤ carbone ≤ 0,15 %, 1,8 % ≤ manganèse ≤ 2,7 %, 0,1 % ≤ silicium ≤ 1 %, 0,01 % ≤ aluminium ≤ 0,8 %, 0,1 % ≤ chrome ≤ 0,9 %, 0 % ≤ phosphore ≤ 0,09 %, 0,0001 % ≤ titane ≤ 0,1 %, 0,0005 % ≤ bore ≤ 0,003 %, 0,01 % ≤ niobium ≤ 0,1 %, 0 % ≤ soufre ≤ 0,09 %, 0 % ≤ azote ≤ 0,09 %, 0 % ≤ vanadium ≤ 0,2 %, 0 % ≤ molybdène ≤ 0,2 %, 0 % ≤ nickel ≤ 2 %, 0 % ≤ cuivre ≤ 2 %, 0 % ≤ calcium ≤ 0,005 %, 0 % ≤ cérium ≤ 0,1 %, 0 % ≤ magnésium ≤ 0,05 %, 0 % ≤ zirconium ≤ 0,05 %, le reste étant composé de fer et d'impuretés inévitables provoquées par le traitement, la microstructure de ladite tôle d'acier comprenant en fraction surfacique, 40 % à 60 % de martensite, 15 à 40 % de ferrite inter-critique, une quantité cumulée de 10 à 35 % de ferrite et de bainite transformées et 0 % à 5 % d'austénite résiduelle.
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