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1. WO2020109447 - METHOD FOR PRODUCING A MULTI-PHASE STEEL

Publication Number WO/2020/109447
Publication Date 04.06.2020
International Application No. PCT/EP2019/082865
International Filing Date 28.11.2019
IPC
C21D 1/18 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
18Hardening; Quenching with or without subsequent tempering
C21D 11/00 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
11Process control or regulation for heat treatments
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
CPC
C21D 1/18
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
18Hardening
C21D 1/185
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
18Hardening
185from an intercritical temperature
C21D 1/26
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
C21D 11/00
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
11Process control or regulation for heat treatments
C21D 11/005
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
11Process control or regulation for heat treatments
005for cooling
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
Applicants
  • SMS GROUP GMBH [DE]/[DE]
Inventors
  • BIGLARI, Mostafa
  • HASSEL, Christoph
  • SOMMERS, Ulrich
  • HEIMANN, Thomas
Agents
  • KLÜPPEL, Walter
Priority Data
10 2018 220 500.028.11.2018DE
Publication Language German (DE)
Filing Language German (DE)
Designated States
Title
(DE) VERFAHREN ZUR HERSTELLUNG EINES MEHRPHASENSTAHLS
(EN) METHOD FOR PRODUCING A MULTI-PHASE STEEL
(FR) PROCÉDÉ DE PRODUCTION D’UN ACIER MULTIPHASE
Abstract
(DE)
Die Erfindung betrifft ein Verfahren zur Herstellung eines Mehrphasenstahls, insbesondere in Form eines Bandes, bei dem der Stahl während seiner Herstellung zunächst in einem ersten Schritt von einem vollaustenitischen Bereich in einen teilaustenitischen Bereich gebracht wird und der Stahl dann in einem zweiten Schritt vom teilaustenitischen Bereich abgekühlt wird, wobei ein Gefügemodell zur Bestimmung mindestens eines Phasenanteils des Stahls eingesetzt wird. Um ein Gefügemodell bereitzustellen, welches eine verbesserte Vorhersage der Phasenbestandteile des Stahls erlaubt, sieht die Erfindung vor, dass bei dem Gefügemodell für die Umwandlungstemperatur und/oder für die Kühlrate im ersten Schritt eine Gleichung zugrunde gelegt wird, die für die Umwandlung aus dem vollaustenitischen Bereich gilt, wobei die Gleichung für die Berechnung der Umwandlung aus dem teilaustenitischen Bereich im zweiten Schritt modifiziert wird.
(EN)
The invention relates to a method for producing a multi-phase steel, in particular in the form of a strip, in which method the steel, during the production thereof, is first brought from a fully austenitic range into a semi-austenitic range in a first step and the steel is then cooled from the semi-austenitic range in a second step, a microstructure model being used to determine at least one phase concentration of the steel. The aim of the invention is to provide a microstructure model that allows improved prediction of the phase constituents of the steel. This aim is achieved, according to the invention, in that an equation applicable to the transformation from the fully austenitic range is taken as a basis of the microstructure model for the transformation temperature and/or for the cooling rate in the first step, the equation being modified for the calculation of the transformation from the semi-austenitic range in the second step.
(FR)
L'invention concerne un procédé de production d'un acier multiphase, en particulier sous la forme d'une bande, l'acier étant amené d'un domaine complètement austénitique vers un domaine partiellement austénitique lors de sa production d'abord au cours d'une première étape, puis l'acier étant refroidi à partir du domaine partiellement austénitique au cours d'une seconde étape, un modèle de structure destiné à déterminer au moins une proportion de phase de l'acier étant utilisé. Selon l'invention, afin de fournir un modèle de structure qui permet une prédiction améliorée des éléments de phase de l'acier, une équation qui s'applique à la conversion à partir du domaine complètement austénitique sert de base au modèle de structure pour la température de conversion et/ou pour la vitesse de refroidissement au cours de la première étape, l'équation pour la détermination de la conversion à partir du domaine partiellement austénitique étant modifiée au cours de la seconde étape.
Also published as
Latest bibliographic data on file with the International Bureau