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1. WO2000036162 - METHOD FOR PRODUCING THIN HOT-ROLLED STEEL STRIPS WITH IMPROVED DEEP-DRAWING QUALITIES

Publication Number WO/2000/036162
Publication Date 22.06.2000
International Application No. PCT/EP1999/009836
International Filing Date 11.12.1999
Chapter 2 Demand Filed 13.07.2000
IPC
C21D 8/04 2006.1
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
04to produce plates or strips for deep-drawing
C21D 9/48 2006.1
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
48deep-drawing sheets
CPC
C21D 8/0426
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
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
02during manufacturing of plates or strips
04to produce plates or strips for deep-drawing
0421characterised by the working steps
0426Hot rolling
C21D 8/0431
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
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
02during manufacturing of plates or strips
04to produce plates or strips for deep-drawing
0421characterised by the working steps
0431Warm rolling
C21D 8/0463
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
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
02during manufacturing of plates or strips
04to produce plates or strips for deep-drawing
0447characterised by the heat treatment
0463following hot rolling
C21D 9/48
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
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
46for sheet metals
48deep-drawing sheets
Applicants
  • MAX-PLANCK-INSTITUT FÜR EISENFORSCHUNG GMBH [DE]/[DE] (AllExceptUS)
  • KASPAR, Radko [DE]/[DE] (UsOnly)
  • TOMITZ, Andreas [DE]/[DE] (UsOnly)
Inventors
  • KASPAR, Radko
  • TOMITZ, Andreas
Agents
  • COHAUSZ & FLORACK
Priority Data
198 58 073.816.12.1998DE
Publication Language German (de)
Filing Language German (DE)
Designated States
Title
(DE) VERFAHREN ZUR ERZEUGUNG VON DÜNNEN WARMBÄNDERN AUS STAHL MIT VERBESSERTER TIEFZIEHFÄHIGKEIT
(EN) METHOD FOR PRODUCING THIN HOT-ROLLED STEEL STRIPS WITH IMPROVED DEEP-DRAWING QUALITIES
(FR) PROCEDE PERMETTANT DE PRODUIRE A PARTIR D'ACIER DES BANDES A CHAUD MINCES PRESENTANT UNE MEILLEURE APTITUDE A L'EMBOUTISSAGE PROFOND
Abstract
(DE) Die Erfindung betrifft ein Verfahren zur Erzeugung von dünnen Warmbändern aus Stahl mit verbesserter Tiefziehbarkeit, bei dem Brammen oder Dünnbrammen zunächst im Austenitgebiet vorgewalzt und nach einer Abkühlung bis zur vollständigen Umwandlung in ferritisches Gefüge fertiggewalzt werden, danach gehaspelt und rekristallisierend geglüht werden. Kennzeichen der Erfindung ist, daß die Bänder mit einer Endwalztemperatur unter 760 °C fertiggewalzt und danach gehaspelt werden. Die Coils werden unmittelbar anschließend an das Haspeln im noch warmen Zustand in einen Glühofen eingesetzt, darin auf Rekristallisationstemperatur erwärmt und rekristallisierend geglüht.
(EN) The invention relates to a method for producing thin hot-rolled steel strips with improved deep-drawing qualities. According to said method slabs or thin slabs are first pre-rolled in the austenitic phase; after cooling finish-rolled until they are fully transformed into a ferritic microstructure; and then coiled and annealed until recrystallisation. The invention is characterized in that the strips are finish-rolled at an end temperature below 760 °C and then coiled. Immediately after coiling the coils are introduced into an annealing furnace while still hot, heated to a recrystallisation temperature and then annealed until recrystallisation.
(FR) L'invention concerne un procédé permettant de produire à partir d'acier des bandes à chaud minces présentant une meilleure aptitude à l'emboutissage profond. Selon le procédé, les brames ou les brames minces sont dégrossies dans le domaine austénitique; après refroidissement, elles sont laminées jusqu'à leur transformation complète en structure ferritique; puis elles sont bobinées et recuites jusqu'à recristallisation. La caractéristique de l'invention est que la passe finale de laminage des bandes se fait à une température finale inférieure à 760 °C et qu'elle est suivie du recuit. Immédiatement après le bobinage, les rouleaux encore chauds sont introduits dans un four à recuire, où ils sont chauffés jusqu'à la température de recristallisation et recuits jusqu'à recristallisation.
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