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1. WO2020221628 - PROCESS FOR PRODUCING BATCH ANNEALED TAILOR ROLLED STRIP

Publication Number WO/2020/221628
Publication Date 05.11.2020
International Application No. PCT/EP2020/061108
International Filing Date 21.04.2020
IPC
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
B21B 37/26 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
BROLLING OF METAL
37Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
16Control of thickness, width, diameter or other transverse dimensions
24Automatic variation of thickness according to a predetermined programme
26for obtaining one strip having successive lengths of different constant thickness
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
CPC
C21D 1/673
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
62Quenching devices
673for die quenching
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 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 6/005
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
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 BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
6Heat treatment of ferrous alloys
008containing Si
Applicants
  • TATA STEEL IJMUIDEN B.V. [NL]/[NL]
Inventors
  • ENNIS, Bernard Leo
  • MOSTERT, Richard
  • CELOTTO, Steven
  • KOP, Theo Arnold
Agents
  • GROUP INTELLECTUAL PROPERTY SERVICES
Priority Data
19171939.230.04.2019EP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) PROCESS FOR PRODUCING BATCH ANNEALED TAILOR ROLLED STRIP
(FR) PROCÉDÉ DE PRODUCTION D'UNE BANDE LAMINÉE SUR MESURE À RECUIT DISCONTINU
Abstract
(EN)
The invention relates to a process for producing batch annealed tailor rolled steel strip is provided, comprising the following steps: a) casting a slab having a composition of (in wt%): C = 0 – 0.2; Mn = 2.0 – 4.0; Si ≤ 1.0; P = 0.001 – 0.05: S = 0.001 – 0.01; N ≤ 0.02; Al = 0.01 – 0.10; optionally: Ti ≤ 0.04; Nb ≤ 0.04; V ≤ 0.20; Mo ≤ 0.10; B ≤ 0.005; Cr ≤ 1.0; Ca ≤ 0.005, wherein Ti + Nb ≤ 0.05, wherein V + Mo ≤ 0.15, and wherein 2.0 ≤ Cr + Mn ≤ 4.0, the remainder being Fe and unavoidable impurities b) hot rolling the slab to a finish rolling temperature between 910 and 1100 °C c) cooling the hot rolled strip to a coiling temperature between 200 and 700 °C d) cold rolling the hot rolled strip with a reduction of at least 30% using differential rolling to produce different thicknesses within the strip, so as to produce a tailor rolled steel strip, to be cut into tailor rolled blanks e) batch annealing the differential cold rolled strip at a temperature between 650 °C and the Ac3 temperature of the strip, to obtain a batch annealed tailor rolled steel strip having a Rm of at least 570 MPa.
(FR)
L'invention concerne un procédé de fabrication d'une bande d'acier laminée sur mesure à recuit discontinu, comprenant les étapes suivantes consistant à : a) couler une brame ayant la composition suivante (en % en poids) : C = 0 à 0,2 ; Mn = 2,0 à 4,0 ; Si ≤ 1,0 ; P = 0,001 à 0,05 ; S = 0,001 à 0,01 ; N ≤ 0,02 ; Al = 0,01 à 0,10 ; éventuellement : Ti ≤ 0,04 ; Nb ≤ 0,04 ; V ≤ 0,20 ; Mo ≤ 0,10 ; b ≤ 0,005 ; Cr ≤ 1,0 ; Ca ≤ 0,005, Ti + Nb ≤ 0,05, V + Mo ≤ 0,15, et 2,0 ≤ Cr + Mn ≤ 4,0, le reste étant constitué de Fe et des impuretés inévitables ; b) laminer à chaud la brame jusqu'à une température de laminage de finition comprise entre 910 et 1 100 °C ; c) refroidir la bande laminée à chaud jusqu'à une température de bobinage comprise entre 200 et 700 °C ; d) laminer à froid la bande laminée à chaud avec une réduction d'au moins 30 % en utilisant un laminage différentiel pour produire différentes épaisseurs à l'intérieur de la bande, de manière à produire une bande d'acier laminée sur mesure, à découper en ébauches laminées sur mesure ; e) recuire de manière discontinue la bande laminée à froid différentielle à une température comprise entre 650 °C et la température Ac3 de la bande, pour obtenir une bande d'acier laminée sur mesure à recuit discontinu ayant une Rm d'au moins 570 MPa.
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