EP0441674A1 - Verfahren zur Aluminisierung von magnetischorientierten Stahlblechen sowie hergestellte magnetischorientierte Stahlbleche - Google Patents

Verfahren zur Aluminisierung von magnetischorientierten Stahlblechen sowie hergestellte magnetischorientierte Stahlbleche Download PDF

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Publication number
EP0441674A1
EP0441674A1 EP91400188A EP91400188A EP0441674A1 EP 0441674 A1 EP0441674 A1 EP 0441674A1 EP 91400188 A EP91400188 A EP 91400188A EP 91400188 A EP91400188 A EP 91400188A EP 0441674 A1 EP0441674 A1 EP 0441674A1
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EP
European Patent Office
Prior art keywords
aluminum
sheet
temperature
under
annealing
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.)
Granted
Application number
EP91400188A
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English (en)
French (fr)
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EP0441674B1 (de
Inventor
Pierre Brissonneau
Jean-Luc Laverny
Jean-Claude Perrier
Jean Verdun
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.)
Ugine SA
Original Assignee
Ugine Aciers SA
Ugine Aciers de Chatillon et Guegnon
Ugine SA
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Application filed by Ugine Aciers SA, Ugine Aciers de Chatillon et Guegnon, Ugine SA filed Critical Ugine Aciers SA
Publication of EP0441674A1 publication Critical patent/EP0441674A1/de
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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
    • C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
    • 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
    • C21D8/1272—Final recrystallisation annealing

Definitions

  • the subject of the present invention is a process for the aluminization of magnetic grain oriented steel sheets.
  • Oriented grain magnetic steel sheets for example GOSS textured, are used in the construction of electrical machines, in particular transformers where their magnetic characteristics play an important role.
  • FR-A-1 525 034 a process which consists of covering the sheet on each of its faces with a layer of aluminum, silicon, or germanium, to diffuse this element by heat treatment in the matrix, and then to perform on the metal thus obtained a heat treatment in a megetic field to improve the configuration of the Weiss domains and obtain the desired structure.
  • the diffusion takes place at a temperature between 750 ° C to 1050 ° C, more particularly at 900 ° C for three hours under a hydrogen atmosphere.
  • a hot leveling treatment is essential. This last heat treatment is carried out in an oven when passing at a temperature of the order of 900 ° C., for a few minutes, followed by cooling in a magnetic field, when the temperature is between 600 ° C. and 300 ° C.
  • the aluminization stage is a stage preceding the development of the texture of the grains of the sheets.
  • a process for manufacturing oriented grain sheets with high magnetic properties in the rolling direction from a steel strip capable of acquiring the texture of GOSS, but not having it yet, and this thanks to a suitable composition of the steel and to an appropriate cold rolling followed by a decarburization annealing to less than 0.005% of carbon.
  • Aluminum is deposited on said strip, followed by hot diffusion of this aluminum throughout the mass of the strip to be treated, in solid phase, this diffusion of aluminum taking place before recrystallization is carried out hot. secondary in GOSS texture.
  • the decarburized cold rolled strip is wound with an aluminum strip. This winding is followed by two successive heat treatments, at two different temperatures, which may or may not take place in the same oven, with or without return to ambient temperature between the two treatments.
  • the first treatment between 600 and 800 ° C, diffuses the aluminum into the strip to be treated, and the second treatment, between 950 and 1250 ° C, performs secondary recrystallization in GOSS texture.
  • the aluminum diffusion step is carried out before recrystallization in GOSS texture.
  • the method according to the present invention relates to the manufacture of aluminized magnetic steel sheets with oriented grains, comprising an aluminization operation carried out during the recrystallization process of the grains of the magnetic sheet, which, compared to the aforementioned prior techniques, eliminates the specific heat treatment of diffusion of aluminum in the manufacture of sheets while maintaining the grain-oriented texture.
  • the process of aluminizing a magnetic steel sheet with oriented grains having undergone at least one cold rolling, at least one annealing in a hydrogen atmosphere, followed by a decarburization annealing, the grains of the sheet then being in the primary recrystallization state is characterized in that aluminum is deposited on said sheet between two stages of a final annealing, the first step of which performs a partial or total secondary recrystallization of the grains of sheet metal and the second stage of which allows the diffusion of aluminum and the elimination of impurities.
  • the invention also relates to a magnetic steel sheet obtained by this process.
  • FIG. 1 represents an example of a temperature profile of a final annealing.
  • Figure 2 shows three hysteresis cycles corresponding to three comparative aluminization tests.
  • FIG. 1 shows an example of the temperature profile of a final annealing comprising a temperature rise of approximately 40 ° C. per hour.
  • the sheet to be treated is then placed under an atmosphere of neutral gas which can for example be nitrogen, and maintained at a first level P1 which can vary from thirty minutes to five hours at a temperature T1 of between 800 ° C and 1050 ° C .
  • This level allows the germination of crystals having for example the GOSS orientation.
  • the sheet is naturally cooled to a temperature allowing deposition of aluminum in different forms such as evaporation, soaking in a molten bath, contact with aluminum strips.
  • the aluminized sheet is maintained at a second level P2, under a hydrogen atmosphere, for a time comprised between thirty minutes and five hours at a temperature T2 comprised between 1080 ° C and 1200 ° C.
  • the temperature increases at a constant speed of 450 ° C per hour to the temperature T1 of the bearing P1, then at 40 ° C per hour to reach the temperature T2 of the bearing P2, the cooling then taking place. naturally under hydrogen.
  • the saturation magnetization Bs 2.01 Tesla.
  • the aluminum used for the aluminization step is a strip whose weight composition of the residual elements is as follows: Iron: 0.20%; Silicon: 0.20 to 0.30%; Titanium: 0.015%
  • the strip is, moreover, in the annealed state.
  • the density of the aluminized sheets deviates significantly from the density of the Fe-Si 3% base alloy.
  • a fair comparison of physical properties requires expressing the losses per unit of volume, for example in mW / cm3.
  • the aluminizing treatment 2 is carried out by placing a strip on both sides of the magnetic sheet after the latter has undergone the two stages of the final annealing.
  • the aluminizing treatment 3 is carried out by placing the aluminum strip on the two faces of the sheet before the two stages of the final annealing, as recommended in FR-A-2 067 409.
  • the aluminization before the two stages of the final annealing plays a very unfavorable role on the mechanisms of secondary recrystallization.
  • the grains appear irregular, of small size, as they are after the primary growth stage.
  • the magnetic loss characteristics confirm that the alumization process before the two stages of final annealing gives less good results than in the final annealing test without aluminum.
  • the aluminizing treatment 4 according to the invention is carried out by placing the aluminum strip on the two faces of the sheet between the two stages of the final annealing, that is to say after a secondary recrystallization of the grains of the sheet .
  • the magnetic characteristics are grouped in Table IV below.
  • the magnetic characteristics revealed during treatment 3 and grouped in Table III confirm that the aluminization process, before final annealing, does not improve the loss characteristics of the sheet. This is why it was carried out, by cutting the final secondary recrystallization annealing in two stages, with the addition of aluminum at the intermediate stage, that is to say after the secondary recrystallization mechanisms have developed at least partially.
  • the germination of the texture takes place during the first stage of the final annealing during which the recrystallization mechanisms were able intervene.
  • the deposition of aluminum can be carried out either by vacuum evaporation or by dipping in a bath of molten aluminum.
  • the aluminum content in the sheet is between 1 and 5%, and equal to 1.3% in the example.
  • a 0.23 mm thick sheet used in devices working in particular at 400 Hz is the seat of large induced currents which generate additional losses and limit the response time in, for example, control circuits using power components semiconductor. In these conditions, it is very advantageous to work with materials of thinner thickness.
  • a magnetic steel sheet with grains oriented by the method according to the invention corresponding to treatment 4 has been produced, the sheet having a thickness of approximately 0.15 mm.
  • the 0.15mm magnetic sheet obtained by the process has a substantial decrease in the magnetic loss characteristics compared to the loss characteristics of 0.23 mm thick sheets obtained by the same process.
  • the method according to the invention allows an aluminization of the oriented grain sheets during their preparation using the second stage of the final annealing to ensure the diffusion of the aluminum and the removal of the sulfur and other impurities.
  • this process allows a significant saving, in particular of energy, by eliminating a step of heat treatment at high temperature, in comparison with the process materialized by curve 2.
  • the heat treatment temperatures and the durations are liable to change as a function of the thicknesses and initial compositions of the sheets to be aluminized, the example which has just been given concerns magnetic sheets with oriented grains commonly used.
  • the deposition of aluminum is carried out by means of strips, but identical results are obtained by deposition under vacuum or dipping in a bath of molten aluminum.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Soft Magnetic Materials (AREA)
  • Hard Magnetic Materials (AREA)
EP91400188A 1990-02-06 1991-01-28 Verfahren zur Aluminisierung von magnetischorientierten Stahlblechen sowie hergestellte magnetischorientierte Stahlbleche Expired - Lifetime EP0441674B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9001362 1990-02-06
FR909001362A FR2657887B1 (fr) 1990-02-06 1990-02-06 Procede d'aluminisation de toles d'acier magnetique a grains orientes et toles d'acier magnetique obtenues selon ce procede.

Publications (2)

Publication Number Publication Date
EP0441674A1 true EP0441674A1 (de) 1991-08-14
EP0441674B1 EP0441674B1 (de) 1994-07-27

Family

ID=9393430

Family Applications (1)

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EP91400188A Expired - Lifetime EP0441674B1 (de) 1990-02-06 1991-01-28 Verfahren zur Aluminisierung von magnetischorientierten Stahlblechen sowie hergestellte magnetischorientierte Stahlbleche

Country Status (7)

Country Link
US (1) US5123976A (de)
EP (1) EP0441674B1 (de)
AT (1) ATE109211T1 (de)
DE (1) DE69103035T2 (de)
DK (1) DK0441674T3 (de)
ES (1) ES2061192T3 (de)
FR (1) FR2657887B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2704239A1 (fr) * 1993-04-23 1994-10-28 Ugine Sa Procédé d'enrichissement en un élément d'alliage d'une tôle en acier magnétique.
FR2706171A1 (fr) * 1993-06-07 1994-12-16 Europ Gas Turbines Sa Procédé d'aluminisation notamment pour cavités métalliques allongées.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1525034A (fr) * 1966-08-09 1968-05-17 Loire Atel Forges Perfectionnements apportés aux procédés pour l'amélioration des propriétés magnétiques des aciers à usages magnétiques, et produits obtenus par ces procédés
FR2067409A5 (de) * 1969-11-03 1971-08-20 Creusot Loire

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR92623E (fr) * 1967-06-19 1968-12-06 Loire Atel Forges Perfectionnements apportés aux procédés pour l'amélioration des propriétés magnétiques des aciers à usages magnétiques, et produits obtenus par ces procédés
GB1559733A (en) * 1977-01-31 1980-01-23 Nat Res Dev Diffusing an element into a metal
JPS5933170B2 (ja) * 1978-10-02 1984-08-14 新日本製鐵株式会社 磁束密度の極めて高い、含Ａｌ一方向性珪素鋼板の製造法
IN171547B (de) * 1988-03-25 1992-11-14 Armco Advanced Materials

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1525034A (fr) * 1966-08-09 1968-05-17 Loire Atel Forges Perfectionnements apportés aux procédés pour l'amélioration des propriétés magnétiques des aciers à usages magnétiques, et produits obtenus par ces procédés
FR2067409A5 (de) * 1969-11-03 1971-08-20 Creusot Loire

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2704239A1 (fr) * 1993-04-23 1994-10-28 Ugine Sa Procédé d'enrichissement en un élément d'alliage d'une tôle en acier magnétique.
FR2706171A1 (fr) * 1993-06-07 1994-12-16 Europ Gas Turbines Sa Procédé d'aluminisation notamment pour cavités métalliques allongées.
US5648120A (en) * 1993-06-07 1997-07-15 European Gas Turbines Sa Method of aluminizing, in particular for aluminizing elongate metal cavities

Also Published As

Publication number Publication date
US5123976A (en) 1992-06-23
EP0441674B1 (de) 1994-07-27
DE69103035T2 (de) 1995-03-23
ES2061192T3 (es) 1994-12-01
FR2657887A1 (fr) 1991-08-09
DK0441674T3 (da) 1994-11-28
ATE109211T1 (de) 1994-08-15
DE69103035D1 (de) 1994-09-01
FR2657887B1 (fr) 1994-03-04

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