Processing

Please wait...

Settings

Settings

Goto Application

1. WO2020109850 - COLD ROLLED ANNEALED STEEL SHEET WITH HIGH HOLE EXPANSION RATIO AND MANUFACTURING PROCESS THEREOF

Publication Number WO/2020/109850
Publication Date 04.06.2020
International Application No. PCT/IB2018/059510
International Filing Date 30.11.2018
IPC
C21D 9/50 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
50for welded joints
B23K 11/06 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
11Resistance welding; Severing by resistance heating
06using roller electrodes
B23K 11/30 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
11Resistance welding; Severing by resistance heating
30Features relating to electrodes
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
CPC
C21D 1/19
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
18Hardening
19by interrupted quenching
C21D 1/20
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
18Hardening
19by interrupted quenching
20Isothermal quenching, e.g. bainitic hardening
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 2211/008
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 6/008
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
6Heat treatment of ferrous alloys
008containing Si
Applicants
  • ARCELORMITTAL [LU]/[LU]
Inventors
  • HELL, Jean-Christophe
Agents
  • PLAISANT, Sophie
Priority Data
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) COLD ROLLED ANNEALED STEEL SHEET WITH HIGH HOLE EXPANSION RATIO AND MANUFACTURING PROCESS THEREOF
(FR) TÔLE D'ACIER RECUIT LAMINÉE À CHAUD PRÉSENTANT UN RAPPORT D'EXPANSION DE TROU ÉLEVÉ ET SON PROCÉDÉ DE FABRICATION
Abstract
(EN)
A cold rolled annealed steel sheet having a chemical composition comprising, in weight %: 0.30% ≤ C ≤ 0.50%, 1.00% ≤ Mn ≤ 2.50%, 1.00% ≤ Si ≤ 2.00%, Al ≤ 2.00%, Cr ≤ 0.100%, 0.100% ≤ Mo ≤ 0. 500%, 0.020% ≤ Nb ≤ 0.200%, B ≤ 0.0005%, P ≤0.02%, S ≤ 0.005%, N≤0.01%, the remainder being Fe and unavoidable impurities, with the percentages in carbon, manganese, chromium, molybdenum and boron are such that the alloy satisfies the following condition: 250%C + 120%Mn - 200%Cr + 200%Mo-10000%B ≥ 320, and wherein the microstructure comprises in surface fraction, 35% to 45 % of islands of martensite and retained austenite (M-A), the total retained austenite is higher than or equal to 24%, the remainder consisting of bainitic ferrite.
(FR)
L'invention concerne une tôle d'acier recuit laminée à froid présentant une composition chimique comprenant, en % en poids : 0,30 % ≤ C ≤ 0,50 %, 1,00 % ≤ Mn ≤ 2,50 %, 1,00 % ≤ Si ≤ 2,00 %, Al ≤ 2,00 %, Cr ≤ 0,100 %, 0,100 % ≤ Mo ≤ 0,500 %, 0,020 % ≤ Nb ≤ 0,200 %, B ≤ 0,0005 %, P ≤ 0,02 %, S ≤ 0,005 %, N ≤ 0,01 %, le reste étant du Fe et des impuretés inévitables, les pourcentages en carbone, manganèse, chrome, molybdène et bore étant tels que l'alliage satisfait la condition suivante : 250 % C + 120 % Mn - 200 % Cr + 200 % Mo - 10 000 % B ≥ 320, et la microstructure comprenant en fraction de surface, 35 % à 45 % d'îlots de martensite et d'austénite résiduelle (M-A), l'austénite résiduelle totale étant supérieure ou égale à 24 %, le reste étant constitué de ferrite bainitique.
Latest bibliographic data on file with the International Bureau