EP0513729A1 - Verfahren zur Herstellung von kornorientierten Elektroblechen - Google Patents

Verfahren zur Herstellung von kornorientierten Elektroblechen Download PDF

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Publication number
EP0513729A1
EP0513729A1 EP92107972A EP92107972A EP0513729A1 EP 0513729 A1 EP0513729 A1 EP 0513729A1 EP 92107972 A EP92107972 A EP 92107972A EP 92107972 A EP92107972 A EP 92107972A EP 0513729 A1 EP0513729 A1 EP 0513729A1
Authority
EP
European Patent Office
Prior art keywords
temperature
strip
annealing
range
cold rolling
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP92107972A
Other languages
German (de)
English (en)
French (fr)
Inventor
Fritz Dr. Dipl.-Phys. Bölling
Andreas Dipl.-Phys. Böttcher
Michael Dr. Dipl.-Phys. Hastenrath
Dieter Dipl.-Ing. Brölsch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thyssen Stahl AG
Original Assignee
Thyssen Stahl AG
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 Thyssen Stahl AG filed Critical Thyssen Stahl AG
Publication of EP0513729A1 publication Critical patent/EP0513729A1/de
Withdrawn legal-status Critical Current

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    • 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
    • C21D8/1266—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 between cold rolling steps
    • 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
    • B21B1/22—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 plates, strips, bands or sheets of indefinite length
    • B21B1/24—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/28—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
    • 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
    • C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
    • C21D3/02—Extraction of non-metals
    • C21D3/04—Decarburising

Definitions

  • the invention relates to a method for producing grain-oriented electrical sheets with a final thickness in the range from 0.1 to 0.5 mm.
  • a hot-rolled strip is made from a steel that 2.0 to 4.0% Si, 0.02 to 0.10% C, 0.02 to 0.15% Mn, 0.008 to 0.08% S and / or Se, Max. 0.005% Al, Max. 0.3% Cu, Remainder Fe, including impurities and, if necessary, grain boundary segregation elements contains.
  • the hot strip with this alloy composition is then optionally annealed at a temperature in the range from 900 to 1,100 ° C. for 60 to 600 s.
  • the previously annealed hot strip is cold rolled in at least two cold rolling stages with an intermediate annealing of the strip at a temperature in the range of 800 to 1,100 ° C for 30 to 600 s and with an annealing treatment before the last cold rolling stage and with a reduction in thickness of 40 to 80% in the last cold rolling stage.
  • the temperature of the strip can optionally be set to a value in the range from 50 to approximately 400 ° C.
  • the strip which has been cold-rolled to its final thickness, is then subjected to recrystallizing annealing in a humid atmosphere with simultaneous decarburization. After a release agent, preferably containing MgO, has been applied to the strip surfaces, the final high-temperature annealing is carried out.
  • this intermediate annealing takes place at a temperature in the range from 850 to 1,100 ° C for at least 30 s to max. 15 minutes.
  • the strip is then cooled from the intermediate annealing temperature in the temperature range from 700 ° C. to 200 ° C. at a speed of at least 2.5 K / s and rolled to final thickness in the last cold rolling stage without a subsequent tempering treatment.
  • the strip temperature during the cold rolling passes in this last cold rolling stage can be set so that it is in the range from 50 to 400 ° C.
  • the invention has for its object to improve the above-described prior art method in such a way that the magnetic properties of the electrical sheets, in particular the magnetic polarization and the magnetic loss, achieve more favorable values and at the same time a better statistical distribution of these values is achieved with less scatter.
  • the strip which has been cold-rolled to an intermediate thickness, accelerates from the annealing temperature after the intermediate annealing with the highest possible speed greater than 50 K / s, preferably greater than 100 to about 300 K / s, cooled and that after max. three months before the last cold rolling step a Anlhielglüh harmony in the temperature range of 300 to 700 o C for at least 30 seconds, and for economic reasons preferably not longer than 15 minutes is performed.
  • the accelerated cooling is preferably carried out with a spray water cooling in order to achieve the highest possible cooling rates.
  • the values for the magnetic loss are reduced on average, as can be seen from FIG. 2.
  • the bars shown in FIG. 2 show the distribution of the loss values of 141 strips produced by the process according to the invention, which, if they are produced alternatively by the known process (low cooling rate, no tempering treatment), give the distribution of the bars in FIG. 1.
  • FIG. 1 known method
  • FIG. 2 method according to the invention
  • FIG. 4 shows, the effect of the intermediate annealing modified according to the invention (intermediate annealing with a high cooling rate and subsequent tempering treatment) occurs particularly clearly in the case of strips which, according to the known conventional manufacturing process, have rather poorer loss values.
  • the greatest reductions in the magnetic loss are achieved with the aid of the method according to the invention in the case of tapes which give poor loss values according to the known method.
  • the magnetization loss P 1.7 / 50 in conventional production is plotted on the abscissa in FIG. 4.
  • FIG. 4 is based on the same data material as FIG. 3.
  • the treatment according to the invention is carried out in directly successive steps, in that the strip is cooled as quickly as possible from the intermediate annealing temperature to a temperature equal to or slightly below the temperature of the tempering treatment, in order to then directly connect the tempering treatment.
  • What is important in any case is the combination of rapid cooling from the intermediate annealing temperature and the subsequent additional annealing treatment at a temperature in the range from 300 to 700 ° C., preferably 450 to 650 ° C., before the last cold rolling stage
  • Table 2 shows further grain-oriented electrical sheets with a final thickness produced by the process according to the invention of 0.30 mm with their achieved magnetic properties. They are compared to such grain-oriented electrical sheets with the same final thickness that were not produced by the method according to the invention.
  • the measured magnetic reversal losses continue to fall, as shown by the exemplary embodiments 3, 1 and 2 in Table 2 and FIG smaller and therefore cheaper values. Accordingly, the measured values for the magnetic polarization advantageously continue to rise towards higher values.
  • Table 2 also shows the temperature range according to the invention for the annealing treatment and is shown graphically in FIG. 6. Accordingly, the most favorable values for the magnetic reversal loss and for the magnetic polarization are achieved when, following the accelerated cooling from the intermediate annealing temperature at a rate of preferably greater than 100 K / s by means of spray water, the tempering treatment of the strip, which has been cold-rolled to an intermediate thickness, preferably in the temperature range from 450 to 650 ° C, in particular at a temperature of about 600 ° C, is carried out.
  • these grain boundary carbides have lengths of 200 to 1,000 nm (typically 500 nm), whereas after the intermediate annealing carried out according to the invention (with accelerated cooling and tempering treatment) they have lengths of 50 to 200 nm (typically 100 nm).
  • the excretions in the interior of the grain are exclusively particles of the inhibitor phase, which are not influenced by the method of treatment according to the invention.
  • the fineness and uniformity of the distribution of the grain boundary carbides is considerably increased by the method according to the invention.
  • the proposed method according to the invention such additional measures are not necessarily required in order in particular to achieve the described stability of the magnetic properties of the grain-oriented electrical sheets, as shown on a selection of 141 different strips.
  • the statistical scatter of the values obtained for the Magnetic loss and for the magnetic To reduce polarization it is sufficient according to the proposed method according to the invention to provide the proposed rapid cooling in combination with the subsequent tempering treatment according to the invention following the conventional intermediate annealing.
  • the main advantage of the method according to the invention is thus the stabilizing effect in the production of grain-oriented electrical sheets on their magnetic properties, such as loss of magnetic reversal and magnetic polarization.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Soft Magnetic Materials (AREA)
EP92107972A 1991-05-17 1992-05-12 Verfahren zur Herstellung von kornorientierten Elektroblechen Withdrawn EP0513729A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4116240 1991-05-17
DE4116240A DE4116240A1 (de) 1991-05-17 1991-05-17 Verfahren zur herstellung von kornorientierten elektroblechen

Publications (1)

Publication Number Publication Date
EP0513729A1 true EP0513729A1 (de) 1992-11-19

Family

ID=6431924

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92107972A Withdrawn EP0513729A1 (de) 1991-05-17 1992-05-12 Verfahren zur Herstellung von kornorientierten Elektroblechen

Country Status (9)

Country Link
EP (1) EP0513729A1 (cs)
JP (1) JPH0797629A (cs)
KR (1) KR920021230A (cs)
CN (1) CN1069288A (cs)
BR (1) BR9201867A (cs)
CA (1) CA2068592A1 (cs)
CS (1) CS146992A3 (cs)
DE (1) DE4116240A1 (cs)
PL (1) PL294562A1 (cs)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4311151C1 (de) * 1993-04-05 1994-07-28 Thyssen Stahl Ag Verfahren zur Herstellung von kornorientierten Elektroblechen mit verbesserten Ummagnetisierungsverlusten
US6309473B1 (en) * 1998-10-09 2001-10-30 Kawasaki Steel Corporation Method of making grain-oriented magnetic steel sheet having low iron loss
BRPI0711794B1 (pt) * 2006-05-24 2015-12-08 Nippon Steel & Sumitomo Metal Corp método para produzir chapa de aço magnético de grão orientado tendo uma alta densidade de fluxo magnético
CN102962267B (zh) * 2012-11-27 2014-09-03 南京钢铁股份有限公司 一种防止小规格弹簧钢脱碳的控制冷却工艺

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0047129B1 (en) * 1980-08-27 1985-04-24 Kawasaki Steel Corporation Grain-oriented silicon steel sheets having a very low iron loss and methods for producing the same
EP0101321B1 (en) * 1982-08-18 1990-12-05 Kawasaki Steel Corporation Method of producing grain oriented silicon steel sheets or strips having high magnetic induction and low iron loss

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4478653A (en) * 1983-03-10 1984-10-23 Armco Inc. Process for producing grain-oriented silicon steel
DE3666229D1 (en) * 1985-02-22 1989-11-16 Kawasaki Steel Co Extra-low iron loss grain oriented silicon steel sheets
US4975127A (en) * 1987-05-11 1990-12-04 Kawasaki Steel Corp. Method of producing grain oriented silicon steel sheets having magnetic properties

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0047129B1 (en) * 1980-08-27 1985-04-24 Kawasaki Steel Corporation Grain-oriented silicon steel sheets having a very low iron loss and methods for producing the same
EP0101321B1 (en) * 1982-08-18 1990-12-05 Kawasaki Steel Corporation Method of producing grain oriented silicon steel sheets or strips having high magnetic induction and low iron loss

Also Published As

Publication number Publication date
JPH0797629A (ja) 1995-04-11
CS146992A3 (en) 1992-11-18
PL294562A1 (cs) 1993-02-08
DE4116240C2 (cs) 1993-07-08
DE4116240A1 (de) 1992-11-19
CA2068592A1 (en) 1992-11-18
BR9201867A (pt) 1993-01-05
KR920021230A (ko) 1992-12-18
CN1069288A (zh) 1993-02-24

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