EP1444372B1 - Procede pour produire une tole electrique a grains non orientes - Google Patents

Procede pour produire une tole electrique a grains non orientes Download PDF

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Publication number
EP1444372B1
EP1444372B1 EP02779558A EP02779558A EP1444372B1 EP 1444372 B1 EP1444372 B1 EP 1444372B1 EP 02779558 A EP02779558 A EP 02779558A EP 02779558 A EP02779558 A EP 02779558A EP 1444372 B1 EP1444372 B1 EP 1444372B1
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EP
European Patent Office
Prior art keywords
strip
hot
rolling
cold
heat treatment
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.)
Revoked
Application number
EP02779558A
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German (de)
English (en)
Other versions
EP1444372A1 (fr
Inventor
Olaf Fischer
Karl Ernst Friedrich
Wolfgang A. Rasim
Jürgen Schneider
Carl-Dieter Wuppermann
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.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Stahl AG
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Publication date
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Application filed by ThyssenKrupp Stahl AG filed Critical ThyssenKrupp Stahl AG
Publication of EP1444372A1 publication Critical patent/EP1444372A1/fr
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Anticipated expiration legal-status Critical
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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
    • 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
    • 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
    • C21D8/1211—Rapid solidification; Thin strip casting
    • 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
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1233—Cold rolling

Definitions

  • the invention relates to a method for producing non-grain oriented electrical sheet or strip.
  • non-grain oriented electrical sheet is in this context a steel sheet or a Steel band understood, which is independent of his Texture below those mentioned in DIN 46 400 part 1 or 4 Sheet metal falls and its loss anisotropy in DIN 46 400 part 1 limits.
  • the terms “tin” and “band” are synonymous here used.
  • the invention had the object of providing a method for cost-effective production of non-grain-oriented To create electrical sheet or strip.
  • the hot strip before cold rolling a Subjected to pickling treatment and / or before cold rolling be annealed.
  • the invention couples the through the use of a Casting rolling mill (in-line casting and rolling) achievable Effects with effects of reducing the workload Cold rolling by using hot-rolled strip made of FeSi steels in a thickness ⁇ 1.8 mm, advantageously ⁇ 1.2 mm.
  • hot strip according to the invention can be processed with respect to the prior art significantly reduced effort to cold-rolled NO electrical steel whose final thickness typically 0.35 mm to 0.75 mm, in particular 0.2 mm, 0.35 mm, 0.50 mm or 0.65 mm. It has surprisingly been found that inventively produced NO electric sheet has despite the saving of conventional process always necessary process steps properties that are at least equal to the properties of conventionally produced NO electric sheets.
  • inventively produced NO electric sheet has despite the saving of conventional process always necessary process steps properties that are at least equal to the properties of conventionally produced NO electric sheets.
  • P 1.5 is understood to mean the loss of magnetization at a polarization of 1.5 T and a frequency of 50 Hz.
  • the grades of the same alloy conventionally produced on the basis of conventional hot strip give values for P 1.5 of> 5.3 W / kg.
  • the the known casting rolls own continuous Sequence of potting steel to thin slabs and hot rolling the thin slabs to hot strip also allowed in the production of inventive hot strips the Saving of work steps, such as reheating slabs and roughing.
  • the saving of the relevant work steps Effects on the material condition in the different production phases. This is different in some cases significantly from the condition that occurs in the conventional production of hot strip is achieved at the one with a reheating of the cooled slabs is started.
  • the According to the invention produced hot strips of conventional differentiates.
  • in-line casting rolls the forming process during hot rolling at favorable thermal conditions. So can the Walzstiche applied with higher degrees of deformation and the Forming conditions targeted for the control of Structure development can be used.
  • the transition temperature from the mixing zone to the ferrite A r1 ⁇ 900 ° C ⁇ 20 ° C and in particular when the thickness of the finished hot-rolled hot strip is not more than 1.2 mm , during hot rolling achieves at least 30% of the thickness decrease in the ferrite area.
  • the transition temperature from the mixture region to the ferrite region A r1 ⁇ 900 ° C ⁇ 20 ° C and the thickness of the finished hot-rolled hot strip is not more than 1.2 mm in particular, it is favorable if at least 35% of the thickness decrease during hot rolling in the two-phase region ⁇ / ⁇ .
  • a rolling is performed in the mixed area, can it also be appropriate to have at least one stitch in the perform pure ferrite.
  • the Thickness decrease during rolling in the ferrite region preferably at least 10% and not more than 33%, so that the Emphasis of reshaping despite the final Rolling in the ferrite area unchanged in the mixed area Austenite / ferrite lies.
  • the last Strokes of hot rolling are carried out in ferrite during hot rolling at least one of the last Forming stitches rolled with lubrication.
  • hot rolling with lubrication occur on the one hand lower Shear deformations, so that the rolled strip in Result a more homogeneous structure across the cross section receives.
  • the lubrication reduced so that above the respective Walzstich a higher thickness decrease is possible. Therefore It can, depending on the desired properties of the too generating electric sheet, be advantageous if all occurring in the ferrite Umformstiche with a rolling lubrication be performed.
  • the reel temperature should be chosen so that it at least 300 ° C lower than that Hot rolling end temperature or higher than that by 150 ° C reduced hot rolling temperature. In compliance with the high Reel temperature can usually be at an additional Hot strip annealing entirely or at least substantially be waived. So rewinding at high supports Temperatures the further softening of the hot strip already in the coil, taking its properties determining Characteristics, such as grain size, texture and excretions, be additionally positively influenced.
  • the low reel temperatures are especially useful higher siliconized electrical sheet grades good Results of work, since in this case, in the course of the Coiling sets a microstructure state when subsequent cold rolling to the expression of a view favorable to the properties of NO electrical sheets Grain structure leads.
  • Hot strip to undergo a surface treatment.
  • This surface treatment usually includes a Pickling of the hot strip, which sticking to the hot strip Tinder is removed.
  • the Surface treatment electrolytic, chemical and / or physically mechanical. The result will be here get a scale-free, as level as possible surface, which ensures a trouble-free cold rolling and the Production of a high-quality cold rolling product supported.
  • Hot-rolled strips in particular have an advantageous effect when the thickness of the hot strip when leaving the Hot strip mill is not more than 1.2 mm. So thin According to the invention produced hot strip can be due to its small thickness in a particularly simple Process into a cold-rolled electrical sheet, its final thickness typically 0.35 mm to 0.75 mm, in particular 0.2 mm, 0.35 mm, 0.50 mm or 0.65 mm, is.
  • the hot strip according to the invention as thin as possibly generated, in particular to thicknesses below 1.2 mm is hot rolled, in the inventive approach regularly enough, the cold rolling with a 20% up 65% total deformation to perform the to achieve the end thicknesses required by the user.
  • the cold rolling can be multi-stage in a known manner respectively. If necessary, it can be done in the same way known manner between at least one of the stages of Kaltwalzens an intermediate annealing of the cold-rolled strip be performed. This intermediate annealing can be done in one decarburizing atmosphere to be carried out as possible low carbon contents of the resulting NO sheet adjust.
  • the cold strip obtained in a conventional manner a final heat treatment be subjected to in the cold-rolled strip an optimal magnetic texture and grain distribution and size too achieve.
  • the cold strip after the Nachrollzen final heat treatment the Automatumformgrad ⁇ 20%.
  • the magnetic polarization J2500 is plotted against the magnetic reversal loss P 1.5 for various non-grain-oriented electrical sheets.
  • Table 1 which is also attached, shows the properties and processing parameters for non-grain oriented electrical steel sheets produced under hot conditions W1 to W16 under laboratory conditions and Table 2 shows the properties and processing parameters for non grain oriented electrical steel sheets produced under hot conditions W17 to W22.
  • non-grain oriented electrical sheets is a FeSil.3 alloy with (in wt%) 0.0017% C, 0.195% Mn, 1.286% Si, 0.039% P and 0.128% Al, balance iron and unavoidable impurities have been melted.
  • the resulting molten steel is in a casting-rolling plant first shed to a strand, from which then in a continuous process Thin slabs were divided, which subsequently as well "in-line” in several passes to hot-rolled strips W1-W22 hot rolled and then reeled.
  • the respective Final thickness WBd of hot strips W1-W22 is shown in Tables 1 and 2 specified.
  • the hot strip thickness WBd of the invention produced hot strips W1-W9 and W17 to W20 was included each below 1.8 mm. For the hot tapes W3, W6, W9 and W17 were even less than 1.2 mm.
  • the hot tapes W10-W16 and W21 and W22 are in contrast, conventional, not inventive Means have been made by cutting the steel into slabs was poured, which was then first cooled to slabs, then reheated and then rolled, before getting to a final thickness in the hot rolling mill 2 mm hot rolled.
  • the hot strips W1, W2, W3 and the hot strip W10 are after rewinding into cold tapes 0.35 mm thick, the hot strips W4, W5, W6 and the hot strips W11, W12, W13 as well as the hot tapes W17 to W22 to cold tapes with a Thickness of 0.5 mm and the hot strips W7, W8, W9 and the Hot tapes W14, W15 and W16 to cold tapes with a thickness cold rolled from 0.65 mm.
  • the achieved Forming degrees are in the column UG in the attached Tables entered.
  • the electromagnetic characteristics P 1.0 , P 1.5 , P 1.7 , J 800 , J 1000 , J 2500 , J 5000 and J 10000 are given in Tables 1.2.
  • P 1.0 ", "P 1.5 “ or “P 1.7” is the loss of magnetization at a polarization of 1.0 T, 1.5 T or 1.7 T and a respective frequency of 50 Hz understood.
  • J 800 ", "J 1000 “, “J 2500 “, “J 5000 “ and “J 10000” respectively denote the magnetic polarization at a magnetic field intensity of 800 A / m, 1000 A / m, 2500 A / m, 5000 A / m or 10000 A / m.
  • non-grain-oriented electrical sheets can be produced in the inventive procedure despite or even because of the savings made possible by the use of a casting-rolling plant in hot processing and low deformation in the cold strip production, their properties at least equal to those of conventionally produced sheets or even superior to that, as the diagram shows.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Electromagnetism (AREA)
  • Metallurgy (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Soft Magnetic Materials (AREA)
  • Metal Rolling (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
  • Thermistors And Varistors (AREA)
  • Cold Cathode And The Manufacture (AREA)

Claims (19)

  1. Procédé de fabrication de tôles ou de feuillards magnétiques à grains non orientés, d'une épaisseur finale ≤ 0,75 mm, qui comprend les étapes de travail suivantes :
    mise en fusion d'un acier qui contient (en % en poids) C ≤ 0,01 % Mn ≤ 1,5 % Si 0,1 - 4,5 % Al 0,001 - 2,0 % P ≤ 0,1 % Sn ≤ 0,15 % Sb ≤ 0,15 %
    le reste étant du fer et les impuretés inévitables,
    coulée de l'acier en brames minces ou en bandes coulées,
    traitement thermique en continu des brames minces coulées ou de la bande coulée après la coulée,
    laminage à chaud réalisé en continu après le traitement thermique des brames minces ou de la bande coulée pour obtenir un feuillard à chaud d'une épaisseur ≤ 1,8 mm,
    bobinage de la bande à chaud,
    laminage à froid de la bande à chaud pour obtenir un feuillard à froid d'une épaisseur finale ≤ 0,75 mm, le taux de déformation total réalisé lors du laminage à froid étant d'au plus 65 % et
    traitement thermique final du feuillard à froid.
  2. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'épaisseur du feuillard à chaud est d'au moins 1,2 mm et en ce que le laminage à froid est réalisé à un degré total de déformation de 20 % à 65 %.
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce que le feuillard à chaud subit un traitement de surface.
  4. Procédé selon la revendication 3, caractérisé en ce que le traitement de surface comprend uniquement un décapage du feuillard à chaud.
  5. Procédé selon l'une des revendications 3 ou 4, caractérisé en ce que le traitement de surface est constitué d'une combinaison d'un prétraitement physique et en particulier mécanique et d'un traitement chimique, par exemple le décapage.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'au moins 30 % de la diminution d'épaisseur pendant le laminage à chaud sont réalisés dans le domaine ferritique si la température de transition entre le domaine mixte et le domaine ferritique Ar1 est ≥ 900°C ± 20°C.
  7. Procédé selon l'une des revendications 1 à 5, caractérisé en ce qu'au moins 35 % de la diminution d'épaisseur pendant le laminage à chaud sont réalisés dans le domaine biphasique γ/α si la température de transition du domaine mixte au domaine ferritique Ar1 est ≤ 900°C ± 20°C.
  8. Procédé selon les revendications 6 ou 7, caractérisé en ce qu'on réalise au moins une passe dans le domaine purement ferritique et en ce que la diminution d'épaisseur lors du laminage dans le domaine ferritique est d'au moins 10 % et d'au plus 33 %.
  9. Procédé selon les revendications précédentes, caractérisé en ce que lors du laminage à chaud dans le domaine ferritique, on réalise au moins une passe avec lubrification.
  10. Procédé selon l'une des revendications 6 à 9, caractérisé en ce que pour la température de bobinage, on a :
    température de bobinage > température finale de laminage -150°C.
  11. Procédé selon l'une des revendications 6 à 9, caractérisé en ce que pour la température de bobinage, on a :
    température de bobinage < température finale de laminage -300°C.
  12. Procédé selon l'une des revendications précédentes, caractérisé en ce que le feuillard à chaud subit un recuit de feuillard à chaud.
  13. Procédé selon l'une des revendications précédentes, caractérisé en ce que le laminage à froid s'effectue en plusieurs étapes.
  14. Procédé selon la revendication 13, caractérisé en ce qu'entre au moins l'une des étapes du laminage à froid, on réalise un recuit intermédiaire du feuillard laminé à froid.
  15. Procédé selon la revendication 14, caractérisé en ce que le recuit intermédiaire est réalisé dans une atmosphère décarburisante.
  16. Procédé selon l'une des revendications précédentes, caractérisé en ce que le traitement thermique final est réalisé dans une atmosphère décarburisante.
  17. Procédé selon l'une des revendications 1 à 15, caractérisé en ce que le traitement thermique final est réalisé dans une atmosphère non décarburisante.
  18. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'après le traitement thermique final, on réalise un traitement électrolytique, chimique et/ou physique de la surface du feuillard à froid.
  19. Procédé selon l'une des revendications précédentes, caractérisé en ce que le feuillard à froid reçoit un laminage final à un degré total de déformation < 15 % après le traitement thermique final.
EP02779558A 2001-11-16 2002-11-14 Procede pour produire une tole electrique a grains non orientes Revoked EP1444372B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10156059 2001-11-16
DE10156059A DE10156059A1 (de) 2001-11-16 2001-11-16 Verfahren zur Herstellung von nichtkornorientiertem Elektroblech
PCT/EP2002/012754 WO2003042416A1 (fr) 2001-11-16 2002-11-14 Procede pour produire une tole magnetique a grains non orientes

Publications (2)

Publication Number Publication Date
EP1444372A1 EP1444372A1 (fr) 2004-08-11
EP1444372B1 true EP1444372B1 (fr) 2005-02-23

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Application Number Title Priority Date Filing Date
EP02779558A Revoked EP1444372B1 (fr) 2001-11-16 2002-11-14 Procede pour produire une tole electrique a grains non orientes

Country Status (7)

Country Link
EP (1) EP1444372B1 (fr)
JP (1) JP2005509738A (fr)
KR (1) KR20050044499A (fr)
AT (1) ATE289631T1 (fr)
DE (2) DE10156059A1 (fr)
ES (1) ES2238617T3 (fr)
WO (1) WO2003042416A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006068399A1 (fr) * 2004-12-21 2006-06-29 Posco Co., Ltd. Toles d'acier magnetiques non orientees presentant d'excellentes proprietes magnetiques et procede de fabrication correspondant
CN102776346A (zh) * 2012-07-06 2012-11-14 河北钢铁股份有限公司邯郸分公司 一种非传统薄板坯连铸连轧生产无取向电工钢的热轧方法
KR102045653B1 (ko) * 2017-12-26 2019-11-15 주식회사 포스코 재질과 두께의 편차가 작은 무방향성 전기강판 및 그 제조방법
KR102109241B1 (ko) * 2017-12-26 2020-05-11 주식회사 포스코 형상 품질이 우수한 무방향성 전기강판 및 그 제조방법
KR102043525B1 (ko) * 2017-12-26 2019-11-12 주식회사 포스코 자기적 특성 및 형상이 우수한 박물 무방향성 전기강판 및 그 제조방법
KR102045655B1 (ko) * 2017-12-26 2019-12-05 주식회사 포스코 자기적 특성 및 형상이 우수한 박물 무방향성 전기강판 및 그 제조방법
KR101977510B1 (ko) * 2017-12-26 2019-08-28 주식회사 포스코 자기적 특성이 우수하고, 두께 편차가 작은 무방향성 전기강판 및 그 제조방법
CN113969371B (zh) * 2020-07-24 2022-09-20 宝山钢铁股份有限公司 一种定子、转子铁芯同时套裁用无取向电工钢板及其制造方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3935038A (en) * 1971-10-28 1976-01-27 Nippon Steel Corporation Method for manufacturing non-oriented electrical steel sheet and strip having no ridging
DD299102A7 (de) * 1989-12-06 1992-04-02 ������@����������@��������@��������@��@��������k�� Verfahren zur herstellung von nichtorientiertem elektroblech
JPH03232924A (ja) * 1990-02-08 1991-10-16 Nippon Steel Corp 直送圧延による無方向性電磁鋼板の製造方法
DE19918484C2 (de) * 1999-04-23 2002-04-04 Ebg Elektromagnet Werkstoffe Verfahren zum Herstellen von nichtkornorientiertem Elektroblech

Also Published As

Publication number Publication date
KR20050044499A (ko) 2005-05-12
WO2003042416A1 (fr) 2003-05-22
EP1444372A1 (fr) 2004-08-11
JP2005509738A (ja) 2005-04-14
ES2238617T3 (es) 2005-09-01
ATE289631T1 (de) 2005-03-15
DE50202344D1 (de) 2005-03-31
DE10156059A1 (de) 2003-05-28

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