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1. (WO2018220430) STEEL SHEET FOR MANUFACTURING PRESS HARDENED PARTS, PRESS HARDENED PART HAVING A COMBINATION OF HIGH STRENGTH AND CRASH DUCTILITY, AND MANUFACTURING METHODS THEREOF
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Pub. No.: WO/2018/220430 International Application No.: PCT/IB2017/053282
Publication Date: 06.12.2018 International Filing Date: 02.06.2017
IPC:
C21D 8/02 (2006.01) ,C21D 8/04 (2006.01) ,C21D 1/19 (2006.01) ,C21D 1/673 (2006.01) ,C22C 38/02 (2006.01) ,C22C 38/04 (2006.01) ,C22C 38/06 (2006.01) ,C22C 38/12 (2006.01) ,C22C 38/14 (2006.01) ,C22C 38/22 (2006.01) ,C22C 38/28 (2006.01) ,C22C 38/32 (2006.01) ,C22C 38/38 (2006.01) ,B23K 35/30 (2006.01) ,C21D 9/46 (2006.01)
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
8
Modifying the physical properties by deformation combined with, or followed by, heat treatment
02
during manufacturing of plates or strips
04
to produce plates or strips for deep-drawing
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
18
Hardening; Quenching with or without subsequent tempering
19
by interrupted quenching
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
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
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
22
with molybdenum or tungsten
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
28
with 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
32
with boron
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
B PERFORMING OPERATIONS; TRANSPORTING
23
MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
K
SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
35
Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
22
characterised by the composition or nature of the material
24
Selection of soldering or welding materials proper
30
with the principal constituent melting at less than 1550°C
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
Applicants:
ARCELORMITTAL [LU/LU]; 24-26, Boulevard d'Avranches L-1160 Luxembourg, LU
Inventors:
BEAUVAIS, Martin; FR
DUMONT, Alice; FR
GIBOT, Alexandre; FR
PERLADE, Astrid; FR
ZHU, Kangying; FR
Agent:
BLOT, Philippe; FR
DOMENEGO, Bertrand; FR
HABASQUE, Etienne; FR
HOLTZ, Béatrice; FR
COLOMBIE, Damien; FR
NEYRET, Daniel; FR
Priority Data:
Title (EN) STEEL SHEET FOR MANUFACTURING PRESS HARDENED PARTS, PRESS HARDENED PART HAVING A COMBINATION OF HIGH STRENGTH AND CRASH DUCTILITY, AND MANUFACTURING METHODS THEREOF
(FR) TÔLE D'ACIER DESTINÉE À LA FABRICATION DE PIÈCES TREMPÉES À LA PRESSE, PIÈCE TREMPÉE À LA PRESSE PRÉSENTANT UNE ASSOCIATION DE RÉSISTANCE ÉLEVÉE ET DE DUCTILITÉ D'IMPACT, ET PROCÉDÉS DE FABRICATION DE CETTE DERNIÈRE
Abstract:
(EN) A steel sheet for the manufacture of a press hardened part, having a composition comprising: 0.15% ≤ C ≤ 0.22%, 3.5% ≤ Mn < 4.2%, 0.001 % ≤ Si ≤ 1.5%, 0.020% ≤ Al ≤ 0.9%, 0.001 % ≤ Cr ≤ 1 %, 0.001 % ≤ Mo ≤ 0.3%, 0.001 % ≤ Ti ≤ 0.040%, 0.0003% ≤ B ≤ 0.004%, 0.001 % ≤ Nb ≤ 0.060%, 0.001 % ≤ N ≤ 0.009%, 0.0005% ≤ S ≤ 0.003%, 0.001 % ≤ P ≤ 0.020%, the microstructure consisting of less than 50% ferrite, 1 % to 20% retained austenite, cementite, such that the surface density of cementite particles larger than 60 nm is lower than 10^7/mm2, the complement consisting of bainite and/or martensite, the retained austenite having an average Mn content of at least 1.1 *Mn%. Press-hardened steel part obtained by hot forming the steel sheet, and manufacturing methods thereof.
(FR) L'invention concerne une tôle d'acier destinée à la fabrication d'une pièce trempée à la presse, présentant une composition comprenant : 0,15 % ≤ C ≤ 0,22 %, 3,5 % ≤ Mn ≤ 4,2 %, 0,001 % ≤ Si ≤ 1,5 %, 0,020 % ≤ Al ≤ 0,9 %, 0,001 % ≤ Cr ≤ 1 %, 0,001 % ≤ Mo ≤ 0,3 %, 0,001 % ≤ Ti ≤ 0,040 %, 0,0003 % ≤ B ≤ 0,004 %, 0,001 % ≤ Nb ≤ 0,060 %, 0,001 % ≤ N ≤ 0,009 %, 0,0005 % ≤ S ≤ 0,003 %, 0,001 % ≤ P ≤ 0,020 %, la microstructure comportant moins de 50 % de ferrite, 1 % à 20 % d'austénite résiduelle, de la cémentite, de sorte que la densité surfacique de particules de cémentite supérieures à 60 nm soit inférieure à 10^7/mm2, le complément comportant de la bainite et/ou de la martensite, l'austénite résiduelle présentant une teneur moyenne en Mn d'au moins 1,1 %. L'invention concerne également une pièce en acier trempé à la presse obtenue par formage à chaud de la tôle d'acier, et des procédés de fabrication de cette dernière.
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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: English (EN)
Filing Language: English (EN)