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1. CA2914441 - HT550 STEEL PLATE WITH ULTRAHIGH TOUGHNESS AND EXCELLENT WELDABILITY AND MANUFACTURING METHOD OF THE SAME

Office
Canada
Application Number 2914441
Application Date 26.03.2014
Publication Number 2914441
Publication Date 24.12.2014
Grant Number
Grant Date 05.03.2019
Publication Kind C
IPC
C22C 38/16
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
16containing copper
C21D 8/02
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 38/04
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
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 38/08
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
08containing nickel
C22C 38/12
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
12containing tungsten, tantalum, molybdenum, vanadium or niobium
CPC
B22D 7/00
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
7Casting ingots, ; e.g. from ferrous metals
C21D 1/60
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, e.g. BY DECARBURISATION OR TEMPERING
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
56characterised by the quenching agents
60Aqueous agents
C21D 1/84
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, e.g. BY DECARBURISATION OR TEMPERING
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
84Controlled slow cooling
C21D 6/001
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, e.g. BY DECARBURISATION OR TEMPERING
6Heat treatment of ferrous alloys
001containing Ni
C21D 6/005
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, e.g. BY DECARBURISATION OR TEMPERING
6Heat treatment of ferrous alloys
005containing Mn
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, e.g. BY DECARBURISATION OR TEMPERING
6Heat treatment of ferrous alloys
008containing Si
Applicants BAOSHAN IRON & STEEL CO., LTD.
Inventors LIU, ZICHENG
LI, XIANJU
Title
(EN) HT550 STEEL PLATE WITH ULTRAHIGH TOUGHNESS AND EXCELLENT WELDABILITY AND MANUFACTURING METHOD OF THE SAME
(FR) TOLE D'ACIER HT550 DE RESISTANCE ULTRAELEVEE ET D'EXCELLENTE SOUDABILITE ET SON PROCEDE DE PRODUCTION
Abstract
(EN) An HT550 steel plate and method of manufacturing thereof is disclosed. Based on a system with ultralow-C, high-Mn, Nb-microalloying, ultramicro Ti treatment, Mn/C is controlled in the range of 15-30, (%Si)×(%Ceq) is less than or equal to 0.050, (%C)×(%Si) is less than or equal to 0.010, (%Mo)×[(%C)+0.13(%Si)] is in the range of 0.003-0.020, the ratio Ti/N is in the range of 2.0~4.0, the steel plate is alloyed with (Cu+Ni+Mo), Ni/Cu is greater than or equal to 1.0, Ca treatment is performed, and Ca/S is in the range of 0.80-3.00; by optimizing TMCP process, the steel plate has microstructures of fine ferrite plus self-tempered bainite with an average grain size being less than or equal to 15 µm, yield strength being 460 MPa or more, tensile strength being 550~700 MPa, yield ratio being 0.85 or less, and -60°C Charpy impact energy (single value) being 60J or more.
(FR) La présente invention concerne une tôle d'acier HT550 de résistance ultraélevée et d'excellente soudabilité et son procédé de production. Sur la base d'un système de constituants obtenu avec un traitement à teneur ultramicro en Ti et une préparation de microalliage de Nb et à teneur ultrafaible en C et à teneur élevée en Mn, Mn/C est régulé de sorte qu'il soit compris entre 15 et 30, (% de Si)×(% de C éq) est inférieur ou égal à 0,050, (% de C)×(% de Si) est inférieur ou égal à 0,010, (% de Mo)×[(% de C)+0,13(% de Si)] est compris entre 0,003 et 0,020, Ti/N est compris entre 2,0 et 4,0, la tôle d'acier est alliée avec du (Cu+Ni+Mo), Ni/Cu est supérieur ou égal à 1,0, un traitement au Ca est réalisé, et le rapport Ca/S est compris entre 0,80 et 3,00 ; en optimisant le procédé de régulation thermomécanique (TMCP), la tôle d'acier a la microstructure de ferrite fine + bainite autotrempante, la taille particulaire moyenne étant inférieure ou égale à 15 µm, la limite d'élasticité étant supérieure ou égale à 460 MPa, la résistance à la traction étant comprise entre 550 et 700 MPa, le rapport de rendement étant inférieur ou égal à 0,85, et l'énergie de résilience de Charpy à -60 °C (valeur simple) étant supérieure ou égale à 60 J ; ainsi, la tôle d'acier peut supporter un soudage avec un apport thermique élevé tout en présentant d'excellentes propriétés uniformes de résistance, de ténacité, et de plasticité, et est particulièrement appropriée pour des structures de ponts maritimes, des structures de tours éoliennes océaniques, des structures de plateformes océaniques et des structures hydroélectriques.