WO2021038108A1 - Procédé de traitement thermique d'un précurseur d'acier - Google Patents

Procédé de traitement thermique d'un précurseur d'acier Download PDF

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Publication number
WO2021038108A1
WO2021038108A1 PCT/EP2020/074237 EP2020074237W WO2021038108A1 WO 2021038108 A1 WO2021038108 A1 WO 2021038108A1 EP 2020074237 W EP2020074237 W EP 2020074237W WO 2021038108 A1 WO2021038108 A1 WO 2021038108A1
Authority
WO
WIPO (PCT)
Prior art keywords
steel
product
heat treatment
furnace
temperature
Prior art date
Application number
PCT/EP2020/074237
Other languages
German (de)
English (en)
Inventor
Ingo Schuster
Andreas Böttcher
Original Assignee
Sms Group Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sms Group Gmbh filed Critical Sms Group Gmbh
Publication of WO2021038108A1 publication Critical patent/WO2021038108A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular fabrication or treatment of ingot or slab
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the invention relates to a method for the heat treatment of a steel intermediate product.
  • a specific temperature must be set for a slab in order to achieve optimal forming properties.
  • EP 2 035 587 B1 describes a method and an installation for the production of hot-rolled rolled stock from grain-oriented silicon steel on the basis of slabs.
  • the slab Before entering the rolling train, the slab is heated to a temperature of at least 1200 ° C and, for this purpose, passes through a preheating stage and an intensive heating stage. In the preheating stage, the slab temperature is set between 1000 ° C and 1100 ° C.
  • WO 2016/059 099 A1 discloses a method for producing a grain-oriented electrical steel strip from thin slabs. The thin slabs are heated to a temperature of> 1050 ° C, preferably a maximum of 1150 ° C should not be exceeded in the temperature control before the first piercing.
  • WO 2016/059 101 A1 describes a process with which a grain-oriented electrical steel strip can be produced.
  • a continuously cast thin slab is heated to a temperature> 1050 ° C in a hot rolling mill before the first piercing and annealed at a temperature ⁇ 1150 ° C to equalize the temperature.
  • the aim of temperature control in the publications is to set an optimal rolling temperature and to bring the aluminum nitrides precipitated during the solidification of the slab into solution in order to then selectively precipitate them during hot rolling.
  • the targeted overheating of the slab surface and the associated formation of liquid and / or partially liquid fayalite phases is accepted in these processes, since the dissolving of the aluminum nitrides and precipitation is essential for the properties of use.
  • the object of the invention is therefore to provide a method for the heat treatment of a steel preliminary product in which liquid and / or partially liquid slag on the surface of the slab is avoided.
  • the object of the invention is achieved by a method having the features of claim 1.
  • the heat treatment time in the furnace before the first piercing is set to a treatment time t B ⁇ -0.5 min / ° C ⁇ T z + 610 min, preferably t B ⁇ -0.45 min / ° C ⁇ T z + 510 min, limited.
  • the limitation of the treatment time in the heat treatment furnace means that the time required for the transport processes for the formation of liquid and / or partially liquid phases is not reached expire. It is essential to the invention that the surface temperature of the steel pre-product is set in a targeted manner and that the heat treatment times are not exceeded. Definitions:
  • Steel pre-product slab or billet from e.g. a continuous cast or
  • Ingot casting which is processed in a hot rolling mill to e.g.
  • Hot strip or bar are rolled, as well as their intermediate products in multi-stage hot rolling with intermediate heating
  • Thin slab slab with d ⁇ 150 mm
  • Pre-strip steel strip with d ⁇ 50 mm
  • the preliminary steel product is heated to the hot rolling temperature in the core by means of a heating device, preferably an induction heating device, before it enters the first hot rolling stand of the rolling step.
  • a heating device preferably an induction heating device
  • Induction devices make it possible to bring energy into the core of a steel pre-product within a short time without heating the surface too much. This avoids the formation of scale and the core rolling temperature can be easily adjusted.
  • the steel pre-product is moved with the aid of rollers as transport devices. Rollers reduce the risk of surface damage, especially in the case of the soft material according to the invention.
  • the steel preliminary product is moved with the aid of rollers as transport devices in the furnace during the heat treatment in the furnace. This avoids scoring or impressions on the surface of the steel pre-product.
  • the temperature on the surface of the steel precursor is, according to claim 6, during the heat treatment preferably a maximum of 20 K above the temperature at which liquid or partially liquid phases from oxidic binary and / or ternary compounds of the scale, preferably comprising Fe x O y , S1O2, AI2O3, form.
  • the formation temperatures of various relevant oxidic phases, in particular phases or mixed phases with Fe x O y , S1O2, Al2O3, are disclosed in the slag atlas. In addition to the mass transfer, this also inhibits the rate of formation of the liquid or partially liquid phases.
  • FIG. 1 shows a diagram with a heat treatment of a thin slab from the casting heat.
  • the core of the thin slab has a significantly higher temperature than the surface of the thin slab.
  • the target temperature is a homogeneous temperature of 1050 ° C both in the core and on the surface. After the temperature has been equalized, the core of the slab is heated to 1250 ° C by inductive heating before the first piercing in the roll stand.
  • FIG. 2 shows the temperature profile of a cold ingot cast slab up to the first tapping.
  • the ingot cast slab is slowly heated to a temperature below 1000 ° C. in two steps.
  • the preheating is followed by a heating curve to the target surface temperature of 1150 ° C. with a maximum holding time of 20 minutes. As a result, the surface of the slab cools down briefly.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Metal Rolling (AREA)

Abstract

L'invention concerne un procédé de traitement thermique d'un précurseur d'acier. En limitant le temps de maintien à des températures auxquelles des phases d'incrustation liquides ou partiellement liquides se forment, la qualité de surface d'une bande chaude produite à partir du précurseur d'acier est améliorée.
PCT/EP2020/074237 2019-08-30 2020-08-31 Procédé de traitement thermique d'un précurseur d'acier WO2021038108A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019213139.5 2019-08-30
DE102019213139 2019-08-30

Publications (1)

Publication Number Publication Date
WO2021038108A1 true WO2021038108A1 (fr) 2021-03-04

Family

ID=72292545

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2020/074237 WO2021038108A1 (fr) 2019-08-30 2020-08-31 Procédé de traitement thermique d'un précurseur d'acier

Country Status (1)

Country Link
WO (1) WO2021038108A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4898628A (en) * 1989-01-19 1990-02-06 Armco Advanced Materials Corporation Hot working method for producing grain oriented silicon steel with improved glass film formation
EP0377734A1 (fr) * 1987-03-11 1990-07-18 Nippon Kokan Kabushiki Kaisha PRODUCTION DE FEUILLES D'ACIER NON ORIENTE A FORTE TENEUR EN Si
US6280542B1 (en) * 1996-06-07 2001-08-28 Corus Technology Bv Method and apparatus for the manufacture of a steel strip
DE102007005015A1 (de) * 2006-06-26 2008-01-03 Sms Demag Ag Verfahren und Anlage zur Herstellung von Warmband-Walzgut aus Siliziumstahl auf der Basis von Dünnbrammen
DE102008029581A1 (de) * 2007-07-21 2009-01-22 Sms Demag Ag Verfahren und Vorrichtung zum Herstellen von Bändern aus Silizum-Stahl oder Mehrphasenstahl
WO2012168141A1 (fr) * 2011-06-10 2012-12-13 Siemens Vai Metals Technologies Gmbh Procédé et dispositif de prétraitement d'un produit à laminer avant le laminage à chaud
JP2013010982A (ja) * 2011-06-28 2013-01-17 Jfe Steel Corp 無方向性電磁鋼板の製造方法
WO2016059101A1 (fr) 2014-10-15 2016-04-21 Sms Group Gmbh Procédé de production de bande d'acier électrique à grains orientés et bande d'acier électrique à grains orientés obtenue selon des applications associées audit procédé
WO2016059099A1 (fr) 2014-10-15 2016-04-21 Sms Group Gmbh Procédé de production de bande d'acier électrique à grains orientés et bande d'acier électrique à grains orientés obtenue selon ce procédé
CN108504952A (zh) * 2018-04-09 2018-09-07 内蒙古工业大学 薄板坯连铸连轧生产新能源汽车用无取向电工钢的方法

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0377734A1 (fr) * 1987-03-11 1990-07-18 Nippon Kokan Kabushiki Kaisha PRODUCTION DE FEUILLES D'ACIER NON ORIENTE A FORTE TENEUR EN Si
US4898628A (en) * 1989-01-19 1990-02-06 Armco Advanced Materials Corporation Hot working method for producing grain oriented silicon steel with improved glass film formation
US6280542B1 (en) * 1996-06-07 2001-08-28 Corus Technology Bv Method and apparatus for the manufacture of a steel strip
DE102007005015A1 (de) * 2006-06-26 2008-01-03 Sms Demag Ag Verfahren und Anlage zur Herstellung von Warmband-Walzgut aus Siliziumstahl auf der Basis von Dünnbrammen
EP2035587B1 (fr) 2006-06-26 2017-02-01 SMS group GmbH Procédé et dispositif de production de matériau de laminage de feuillards à chaud en acier au silicium à base de brames fines
DE102008029581A1 (de) * 2007-07-21 2009-01-22 Sms Demag Ag Verfahren und Vorrichtung zum Herstellen von Bändern aus Silizum-Stahl oder Mehrphasenstahl
WO2012168141A1 (fr) * 2011-06-10 2012-12-13 Siemens Vai Metals Technologies Gmbh Procédé et dispositif de prétraitement d'un produit à laminer avant le laminage à chaud
JP2013010982A (ja) * 2011-06-28 2013-01-17 Jfe Steel Corp 無方向性電磁鋼板の製造方法
WO2016059101A1 (fr) 2014-10-15 2016-04-21 Sms Group Gmbh Procédé de production de bande d'acier électrique à grains orientés et bande d'acier électrique à grains orientés obtenue selon des applications associées audit procédé
WO2016059099A1 (fr) 2014-10-15 2016-04-21 Sms Group Gmbh Procédé de production de bande d'acier électrique à grains orientés et bande d'acier électrique à grains orientés obtenue selon ce procédé
CN108504952A (zh) * 2018-04-09 2018-09-07 内蒙古工业大学 薄板坯连铸连轧生产新能源汽车用无取向电工钢的方法

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