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1. WO2020115537 - LOW-CARBON, HIGH TOUGHNESS, STEEL PLATES FOR PRESSURIZED TANK CAR APPLICATIONS

Publication Number WO/2020/115537
Publication Date 11.06.2020
International Application No. PCT/IB2018/059773
International Filing Date 07.12.2018
IPC
C22C 38/04 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
04containing manganese
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
C21D 1/28 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
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
26Methods of annealing
28Normalising
C22C 38/00 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
C22C 38/12 2006.01
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
C22C 38/22 2006.01
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
CPC
C21D 1/28
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
26Methods of annealing
28Normalising
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 2211/005
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 BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
2211Microstructure comprising significant phases
005Ferrite
C21D 9/46
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
C22C 38/001
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
001containing N
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
Applicants
  • ARCELORMITTAL [LU]/[LU]
Inventors
  • CHALLA, Venkata Sai Ananth
  • ROS YANEZ, Tanya
  • ABOTULA, Sandeep
  • DE, Amar Kumar
Agents
  • PLAISANT, Sophie
Priority Data
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) LOW-CARBON, HIGH TOUGHNESS, STEEL PLATES FOR PRESSURIZED TANK CAR APPLICATIONS
(FR) PLAQUES D'ACIER À FAIBLE TENEUR EN CARBONE ET À HAUTE TÉNACITÉ ÉLEVÉE DESTINÉES À DES APPLICATIONS DE WAGONS-CITERNES PRESSURISÉS
Abstract
(EN)
Steel alloy plates for use in railroad tank cars. The inventive alloy plates have improved toughness and puncture resistance. The steel alloy plates comprise a steel alloy including in wt.%: C: 0.1 - 0.15; Mn: 1.0 - 1.65; Si: 0.15 - 0.40; Al: 0.015 - 0.06; Mo: 0.1 - 0.3; Ni: 0.1 - 0.25; Nb: 0.015 - 0.045; Ti: up to 0.02; Cr: up to 0.22; V: up to 0.08; Cu: up to 0.35; P: max 0.025; S: max 0.015; and N: 0.004 - 0.01. The alloy plate may have been normalized for 30 minutes at 900 °C. The alloy plate may have a tensile strength of at least 560 MPa; a yield strength of at least 345 MPa; a total elongation of at least 22%; a CVN impact toughness of at least 135.5 J at -34.4 °C; a CVN impact toughness of at least 122 J at -45.5 °C. The alloy plate may have a ferrite-bainite microstructure, with 10% or less pearlite. The inventive alloy plate may have an absence of any banded ferrite-pearlite/martensite structure.
(FR)
L'invention porte sur des plaques en alliage d'acier destinées à être utilisées dans des wagons-citernes. Les plaques d'alliage de l'invention présentent une ténacité et une résistance à la perforation améliorées. Les plaques d'alliage d'acier comprennent un alliage d'acier comprenant en % en poids : C : 0,1 à 0,15 ; Mn : 1,0 à 1,65 ; Si : 0,15 à 0,40 ; Al : 0,015 à 0,06 ; Mo : 0,1 à 0,3 ; Ni : 0,1 à 0,25 ; Nb : 0,015 à 0,045 ; Ti : jusqu'à 0,02 ; Cr : jusqu'à 0,22 ; V : jusqu'à 0,08 ; Cu : jusqu'à 0,35 ; P : max 0,025 ; S : max 0,015; et N : 0,004 à 0,01. La plaque d'alliage peut avoir été normalisée pendant 30 minutes à 900 °C. La plaque d'alliage peut présenter une résistance à la traction d'au moins 560 MPa; une limite d'élasticité d'au moins 345 MPa ; un allongement total d'au moins 22 % ; une ténacité à l'impact CVN d'au moins 135,5 J à -34,4 °C ; une ténacité à l'impact CVN d'au moins 122 J à - 45,5 °C. La plaque d'alliage peut avoir une microstructure ferrite-bainite, avec 10 % ou moins de perlite. La plaque d'alliage de l'invention peut présenter l'absence de toute structure de ferrite-perlite/martensite en bandes.
Latest bibliographic data on file with the International Bureau