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1. (WO2018220412) METHOD FOR PRODUCING HIGH-STRENGTH STEEL PARTS WITH IMPROVED DUCTILITY, AND PARTS OBTAINED BY SAID METHOD
Latest bibliographic data on file with the International Bureau    Submit observation

Pub. No.: WO/2018/220412 International Application No.: PCT/IB2017/000677
Publication Date: 06.12.2018 International Filing Date: 01.06.2017
IPC:
C22C 38/00 (2006.01) ,C21D 8/00 (2006.01) ,C21D 8/02 (2006.01) ,C21D 9/00 (2006.01) ,C23C 2/06 (2006.01) ,C23C 2/40 (2006.01) ,C21D 9/46 (2006.01) ,C22C 38/02 (2006.01) ,C22C 38/04 (2006.01) ,C22C 38/06 (2006.01) ,C22C 38/08 (2006.01) ,C22C 38/12 (2006.01) ,C22C 38/14 (2006.01) ,C22C 38/18 (2006.01) ,C22C 38/38 (2006.01) ,C22C 38/40 (2006.01) ,C22C 38/44 (2006.01) ,C21D 1/673 (2006.01)
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
C CHEMISTRY; METALLURGY
21
METALLURGY OF IRON
D
MODIFYING 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
8
Modifying the physical properties by deformation combined with, or followed by, heat treatment
C CHEMISTRY; METALLURGY
21
METALLURGY OF IRON
D
MODIFYING 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
8
Modifying the physical properties by deformation combined with, or followed by, heat treatment
02
during manufacturing of plates or strips
C CHEMISTRY; METALLURGY
21
METALLURGY OF IRON
D
MODIFYING 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
9
Heat treatment, e.g. annealing, hardening, quenching, tempering, adapted for particular articles; Furnaces therefor
C CHEMISTRY; METALLURGY
23
COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
C
COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
2
Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
04
characterised by the coating material
06
Zinc or cadmium or alloys based thereon
C CHEMISTRY; METALLURGY
23
COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
C
COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
2
Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
34
characterised by the shape of the material to be treated
36
Elongated material
40
Plates; Strips
C CHEMISTRY; METALLURGY
21
METALLURGY OF IRON
D
MODIFYING 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
9
Heat treatment, e.g. annealing, hardening, quenching, tempering, adapted for particular articles; Furnaces therefor
46
for sheet metals
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
02
containing silicon
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
04
containing manganese
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
06
containing aluminium
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
08
containing nickel
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
12
containing tungsten, tantalum, molybdenum, vanadium or niobium
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
14
containing titanium or zirconium
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
18
containing chromium
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
18
containing chromium
38
with more than 1.5% by weight of manganese
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
18
containing chromium
40
with nickel
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
18
containing chromium
40
with nickel
44
with molybdenum or tungsten
C CHEMISTRY; METALLURGY
21
METALLURGY OF IRON
D
MODIFYING 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
1
General methods or devices for heat treatment, e.g. annealing, hardening, quenching, tempering
62
Quenching devices
673
for die quenching
Applicants:
ARCELORMITTAL; 24-26, Boulevard d'Avranches L-1160 Luxembourg, LU
Inventors:
COBO, Sebastian; FR
ALLELY, Christian; FR
BEAUVAIS, Martin; FR
AOUAFI, Anis; FR
LUCAS, Emmanuel; FR
Agent:
PLAISANT, Sophie; ArcelorMittal France R&D Intellectual Property 6, rue André Campra Immeuble Le Cézanne 93212 La Plaine Saint-Denis Cedex, FR
Priority Data:
Title (EN) METHOD FOR PRODUCING HIGH-STRENGTH STEEL PARTS WITH IMPROVED DUCTILITY, AND PARTS OBTAINED BY SAID METHOD
(FR) PROCEDE DE FABRICATION DE PIECES D'ACIER A HAUTE RESISTANCE MECANIQUE ET DUCTILITE AMELIOREE, ET PIECES OBTENUES PAR CE PROCEDE
Abstract:
(EN) The invention relates to a rolled steel sheet for press hardening, the chemical composition of which comprises, in weight percentages: 0.24% ≤ C ≤ 0.38%, 0.40% ≤ Mn ≤ 3%, 0.10% ≤ Si ≤ 0.70%, 0.015% ≤ Al ≤ 0.070%, 0% ≤ Cr ≤ 2%, 0.25% ≤ Ni ≤ 2%, 0.015% ≤ Ti ≤ 0.10%, 0% ≤ Nb ≤ 0.060%, 0.0005% ≤ B ≤ 0.0040%, 0.003% ≤ N ≤ 0.010%, 0.0001% ≤ S ≤ 0.005%, 0.0001% ≤ P ≤ 0.025%, the titanium and nitrogen contents satisfying: Ti/N > 3.42, and the carbon, manganese, chromium and silicon contents satisfying: formula (I), the chemical composition optionally comprising one or more of the following elements: 0.05% ≤ Mo ≤ 0.65%, 0.001% ≤ W ≤ 0.30%, 0.0005% ≤ Ca ≤ 0.005%, the remainder consisting of iron and unavoidable impurities resulting from the preparation, the sheet having a nickel Nisurf content at any point of the steel in the vicinity of the surface of said sheet over a depth Δ, such that: Nisurf > Ninom, Ninom being the nominal nickel content of the steel, and such that, Nimax being the maximum nickel content in formula (II), and such that: formula (III), and the surface density of all of the particles Di and the surface density of the particles larger than 2 micrometres D(>2µm) satisfy, at least over a depth of 100 micrometres in the vicinity of the surface of said sheet: Di + 6,75 D(>2µm) < 270 Di and D(>2µm) being expressed as a number of particles per square millimetre.
(FR) L'invention concerne une tôle d'acier laminée, pour durcissement sous presse, dont la composition chimique comprend, les teneurs étant exprimées en poids : 0,24% ≤ C ≤ 0,38%, 0,40% ≤ Mn ≤ 3%, 0,10% ≤ Si ≤ 0,70%, 0,015% ≤ Al ≤ 0,070%, 0% ≤ Cr ≤ 2%, 0,25% ≤ Ni ≤ 2%, 0,015% ≤ Ti ≤ 0,10%, 0 % ≤ Nb ≤ 0,060%, 0,0005% ≤ B ≤ 0,0040%, 0,003% ≤ N ≤ 0,010%, 0,0001 % ≤ S < 0,005%, 0,0001 % ≤ P ≤ 0,025%, étant entendu que les teneurs en titane et en azote satisfont à :Ti/N >3,42, et que les teneurs en carbone, manganèse, chrome et silicium satisfont à : formule (I), la composition chimique comprenant optionnellement un ou plusieurs des éléments suivants: 0,05% ≤ Mo ≤ 0,65%, 0,001% ≤ W ≤ 0,30%%, 0,0005 % ≤ Ca ≤ 0,005%, le reste étant constitué de fer et d'impuretés inévitables provenant de l'élaboration, la tôle contenant une teneur en nickel Nisurf en tout point de l'acier au voisinage de la surface de ladite tôle sur une profondeur Δ, telle que :Nisurf > Ninom, Ninom désignant la teneur nominale en nickel de l'acier, et telle que, Nimax désignant la teneur maximale en nickel au sein de la formule (II), et telle que : formule (III), et et la densité surfacique de toutes les particules Di et la densité surfacique des particules de taille supérieure à 2 micromètres D(>2µm) satisfont, au moins sur une profondeur de 100 micromètres au voisinage de la surface de ladite tôle, à : Di + 6,75 D(>2µm) < 270 Di et D(>2µm) étant exprimées en nombre de particules par millimètres carrés.
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (EPO) (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: French (FR)
Filing Language: French (FR)