EP0401098B1 - Tôle d'acier magnétique laminée à chaud - Google Patents

Tôle d'acier magnétique laminée à chaud Download PDF

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Publication number
EP0401098B1
EP0401098B1 EP90401402A EP90401402A EP0401098B1 EP 0401098 B1 EP0401098 B1 EP 0401098B1 EP 90401402 A EP90401402 A EP 90401402A EP 90401402 A EP90401402 A EP 90401402A EP 0401098 B1 EP0401098 B1 EP 0401098B1
Authority
EP
European Patent Office
Prior art keywords
silicon
final
annealing
texture
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.)
Expired - Lifetime
Application number
EP90401402A
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German (de)
English (en)
French (fr)
Other versions
EP0401098A1 (fr
Inventor
Pierre Brissonneau
Jacques Quenin
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.)
Sollac usinor Sacilor SA
USINOR SA
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Ugine SA
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Publication of EP0401098A1 publication Critical patent/EP0401098A1/fr
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    • 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
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the working steps
    • C21D8/1233—Cold rolling
    • 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

Definitions

  • the subject of the present invention is a sheet metal containing in particular iron, silicon and aluminum, and forming part of a family of oriented grain sheets having a texture of cubic type, that is to say a sheet having two directions. of easy magnetization, one confused with the rolling direction, the other perpendicular to the rolling direction, in the plane of the sheet, called transverse direction.
  • non-oriented magnetic sheets are more particularly intended for the construction of circuits supplied with alternating current, including in particular those of rotating machines of high power. For the construction of these machines, it is important to have very efficient magnetic circuits.
  • the stator is made up of assembled sheets and these have a degree of efficiency which is evaluated according to two parameters which are the level of induction on the one hand, and the volume losses on the other hand.
  • the induction is limited by the saturation magnetization of the material, and the losses include losses by hysteresis and by eddy currents. Also, it is necessary to find a compromise between materials with strong saturation magnetization and low losses.
  • Non-oriented silicon steel sheets currently give the best results, since the particularly strong magnetization of iron is only slightly reduced by the addition of alloying elements, going from 2.16 Tesla for pure iron to 2.0 Tesla for the 3.2% silicon alloy.
  • GOSS texture sheets are not used by manufacturers of rotating machines who prefer so-called non-oriented sheets, in principle without texture, or with little rolling texture. marked.
  • Non-oriented grain sheets called N.O.
  • N.O. have a low anisotropy in the rolling plane, because the grains are distributed substantially randomly, which results in a statistically isotropic behavior.
  • the ternary alloy constituted by Iron, Silicon and Aluminum for example, has an important magnetocrystalline anisotropy energy which tends to maintain, inside each grain, the atomic magnetic moments parallel to the quaternary axes of the crystal. This results in a distribution in domains oriented along the directions of easy magnetization of the type [100].
  • BLOCH walls the easiest magnetization mechanisms involve the displacement of walls, called BLOCH walls, between neighboring domains. It is therefore advantageous in N.O. sheets to preferentially orient these areas in the direction of flow flow.
  • the highest quality sheet steel listed in JIS (Japanese industry standard) C2552 (1986) is grade 35.A.230 (thickness 0.35 mm, W 15/50 ⁇ 2.30 W / Kg and B5000 ⁇ 1.60 T).
  • This process applies to hot-rolled silicon steel sheets containing at most 0.020% carbon, 2.5 to 3.5% silicon, 0.1 to 1.0% manganese and 0.3 to 1.5% Aluminum, the rest being iron and accidental impurities.
  • the method After a cold rolling in at least two stages, with an intermediate annealing and a continuous final annealing to obtain the final thickness, the method provides that the sulfur and oxygen contents are limited respectively to at most 0.0025% and 0.005 % and that the final cold rolling has a reduction rate of between 40 and 70%.
  • the percentages given are expressed in weight concentrations.
  • a comparative test was carried out with a sample having the same composition, with identical decarburization and final annealing, but with an intermediate annealing temperature of 1050 ° C.
  • the losses in the iron W 15/50 and the magnetic induction B5000 obtained are substantially the same, but in this case, the elongation relative to the break measured in the direction of rolling is 3% and the elongation relative to the break measured in the cross direction is 10%.
  • FR-A-2 186 714 also discloses a process for manufacturing magnetic sheets with isotropic magnetic properties by hot and cold rolling of a steel.
  • the process consists in giving a steel with 0.1% maximum of carbon, 0.15 to 0.35% of manganese, 0.3 to 2.4% of aluminum, 0.25% maximum of copper, 0 , 05% maximum of sulfur and 0.02% maximum of phosphorus, by rolling at 820-1080 ° C, a structure of which at least 5% have an orientation (100) ⁇ hkl ⁇ , to be cold rolled with a reduction in cross-section from 50 to 85% and subjecting it to recrystallization annealing at 820 to 950 ° C.
  • the steel according to FR-A-2 186 714 contains copper in a proportion at most equal to 0.25% and does not contain silicon.
  • the present invention therefore aims to avoid the drawbacks mentioned above while increasing the percentage of aluminum and decreasing the percentage of silicon, and to provide a magnetic sheet containing in particular iron, silicon and aluminum having a so-called cubic texture, that is to say having two directions of easy magnetization in the plane of the sheet, one confused with the direction of rolling, the other with the direction transverse, and whose magnetic properties are improved by compared to existing non-oriented iron-silicon sheets, in particular, the permeability in large amplitude excitation fields and the specific losses at industrial frequency for a peak value of the induction of 1.5 Tesla or more, all with mechanical properties comparable to those of non-oriented iron-silicon sheets in common use.
  • the magnetic sheet according to the invention is further characterized in that the directions of easy magnetization are the rolling direction and the direction perpendicular to the rolling in the plane of the sheet.
  • the various stages of the manufacturing cycle have more or less marked influences on the characteristics of the sheet obtained, in particular the texture, the losses, the induction, as will be described with the aid of several examples.
  • Tests were carried out to verify the influence of the initial solidification texture of the ingot of the base steel on the final texture of the sheet.
  • the anisotropy torque is measured by means of a torsion balance.
  • the principle of measurement is as follows: After identifying the rolling direction, a disc with a diameter of approximately 15 mm is punched out of the sheet. This disc is then placed on a horizontal support, mobile around a vertical axis, and an external magnetic field saturates the sample in a variable direction of the horizontal plane identified by the angle made by the magnetization with the direction of rolling. In the presence of a volumetric anisotropy energy, the sample disc is subjected to a torque, which tends to align the magnetization of the disc in one of the preferred directions known as easy magnetization.
  • the measurement consists in varying the angle made by the magnetization with the rolling direction and in recording the mechanical torque which must be exerted on the disc to keep it fixed.
  • the module of the torque as a function of the angle made by the magnetization with the rolling direction has substantially a sinusoidal shape having two successive different maxima M1 and m2 where M1 is the large maximum and m2 the small maximum, the anisotropy being characterized by report which tends towards 1 in the case of an ideal anisotropy, while the quality of the cubic texture is all the better as M1 and m2 are higher.
  • the treatment cycle of the hot rolled steel strip includes two cold rolls and the determination of the influence of the reduction rates during these rollings is important to characterize the evolution of the texture.
  • the measurement of the anisotropy torque is a parameter that allows us to appreciate this evolution.
  • the hot rolled steel strip is reduced after a first cold rolling to an intermediate thickness varying from 0.7 mm to 2 mm.
  • Table 1 presents the results of the measurements of anisotropy couples obtained on the strip reduced to the indicated thickness, of a steel according to the invention of composition Si, 1.92%, Al 1.86%.
  • the final texture can be influenced by the intermediate annealing of the manufacturing cycle according to the invention in particular by the atmosphere during this heat treatment.
  • the intermediate annealing to a thickness of 1 mm is carried out in a dry atmosphere of purified hydrogen, then by varying the oxygen level.
  • Table II summarizes the results obtained at the intermediate stage 1 mm and at the final stage 0.35 mm, for small and large maxima, as well as the corresponding anisotropy coefficients, the composition of the steel being Si 1.92%, Al 1.86%.
  • the role of the final annealing is important since the annealing must repair the defects introduced by the second cold rolling and, moreover, the sheet resulting from this final annealing is directly used. The characteristics after the final annealing are therefore the final characteristics.
  • the anisotropy torque measurements are indicated in Table III for the thickness of 0.35 mm, depending on the temperature of the final annealing.
  • the heat treatment temperature has no significant influence on the anisotropy curves, on the other hand the study of the magnetic losses measured respectively at two induction values of 1 Tesla and 1.5 Tesla as shown in the figures 2 and 3 shows a harmful increase in said magnetic losses, above a final annealing temperature of 1050 ° C. and below 950 ° C.
  • the magnetization values as a function of the final annealing temperatures (for an annealing duration equal to 1 hour) shown in FIG. 4 show a reduction in the magnetization when the temperature of the final annealing increases.
  • the duration of the final annealing does not affect the value of the anisotropy beyond a certain stage, since the grains reach a size such that they pass through the sheet and their growth stops. From this state, the texture no longer changes.
  • Intermediate annealing can be carried out continuously at a temperature above 950 ° C for 1 to 5 minutes, and final annealing at a temperature between 950 ° and 1100 ° C also for 1 to 5 minutes.
  • Example 1 the composition of the steel is given in Table V. TABLE V % in weight in ppm 10 ⁇ 4% Yes Al VS S O NOT Mn Cu Co Or 1.88 1.80 50 3 19 17 20 50 50 50 50
  • the samples are produced from a hot-rolled sheet reduced to an intermediate thickness of 1 mm, then annealed under H2 for 2 min at a temperature of 1020 ° C.
  • Example 2 the composition of the steel is given by the following Table VI: TABLE VI % in weight 10 ⁇ 4% Yes Al VS S O NOT Mn Cu Co Or Cr 1.86 1.81 40 2 11 1 50 50 60 30 20
  • the present invention provides an improvement in magnetic properties compared to existing non-oriented iron-silicon sheets, while having mechanical properties comparable to those of non-oriented iron-silicon sheets in common use.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Electromagnetism (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Soft Magnetic Materials (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
EP90401402A 1989-06-01 1990-05-25 Tôle d'acier magnétique laminée à chaud Expired - Lifetime EP0401098B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8907263A FR2647813B1 (fr) 1989-06-01 1989-06-01 Tole magnetique obtenue a partir d'une bande d'acier laminee a chaud contenant notamment du fer, du silicium et de l'aluminium
FR8907263 1989-06-01

Publications (2)

Publication Number Publication Date
EP0401098A1 EP0401098A1 (fr) 1990-12-05
EP0401098B1 true EP0401098B1 (fr) 1995-11-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP90401402A Expired - Lifetime EP0401098B1 (fr) 1989-06-01 1990-05-25 Tôle d'acier magnétique laminée à chaud

Country Status (9)

Country Link
US (1) US5306356A (da)
EP (1) EP0401098B1 (da)
JP (1) JPH0324251A (da)
AT (1) ATE130874T1 (da)
DE (1) DE69023814T2 (da)
DK (1) DK0401098T3 (da)
ES (1) ES2082841T3 (da)
FR (1) FR2647813B1 (da)
GR (1) GR3018689T3 (da)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06238118A (ja) * 1993-02-18 1994-08-30 Electric Power Dev Co Ltd 燃焼排ガス用除塵装置の運転方法
JP3470475B2 (ja) * 1995-11-27 2003-11-25 Ｊｆｅスチール株式会社 極めて鉄損の低い方向性電磁鋼板とその製造方法
DE19634524A1 (de) * 1996-08-27 1998-04-09 Krupp Ag Hoesch Krupp Leichtbaustahl und seine Verwendung für Fahrzeugteile und Fassadenverkleidungen
JP3316854B2 (ja) * 1996-11-01 2002-08-19 住友金属工業株式会社 二方向性電磁鋼板およびその製造方法
CN1102670C (zh) * 1999-06-16 2003-03-05 住友金属工业株式会社 无方向性电磁钢片及其制造方法
JP4507316B2 (ja) * 1999-11-26 2010-07-21 Ｊｆｅスチール株式会社 Ｄｃブラシレスモーター
US20080097300A1 (en) * 2006-08-07 2008-04-24 Sherif Eskaros Catheter balloon with multiple micropleats
DE102012002642B4 (de) * 2012-02-08 2013-08-14 Salzgitter Flachstahl Gmbh Warmband zur Herstellung eines Elektroblechs und Verfahren hierzu
JP6984763B2 (ja) * 2019-04-22 2021-12-22 Ｊｆｅスチール株式会社 圧延鋼板の金属組織評価装置、圧延鋼板の金属組織評価方法、鋼材の製造設備、鋼材の製造方法、及び鋼材の品質管理方法
CN114521546A (zh) * 2022-03-01 2022-05-24 刘伟 一种林业用便于快速移动的高效打药机及其使用方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1159979B (de) * 1957-02-16 1963-12-27 Ver Deutsche Metallwerke Ag Verfahren zur Herstellung kornorientierter Bleche oder Baender aus silizium- und/oder aluminiumhaltigen Eisenlegierungen
US3971678A (en) * 1972-05-31 1976-07-27 Stahlwerke Peine-Salzgitter Aktiengesellschaft Method of making cold-rolled sheet for electrical purposes
DE2226379B2 (de) * 1972-05-31 1976-06-24 Stahlwerke Peine-Salzgitter AG, 315OPeine Verfahren zum herstellen von kaltgewalztem elektroblech
JPS5366816A (en) * 1976-11-26 1978-06-14 Kawasaki Steel Co Method of making nondirectional silicon steel shee having high magnetic flux and low iron loss
JPS5850295B2 (ja) * 1980-06-04 1983-11-09 新日本製鐵株式会社 磁束密度の高い一方向性珪素鋼板の製造法
JPS58157917A (ja) * 1982-03-15 1983-09-20 Kawasaki Steel Corp 磁気特性の優れた一方向性珪素鋼板の製造方法
JPH0674460B2 (ja) * 1985-06-26 1994-09-21 日新製鋼株式会社 電磁鋼板の製造法

Also Published As

Publication number Publication date
DE69023814T2 (de) 1996-04-11
GR3018689T3 (en) 1996-04-30
US5306356A (en) 1994-04-26
FR2647813A1 (fr) 1990-12-07
ES2082841T3 (es) 1996-04-01
ATE130874T1 (de) 1995-12-15
DE69023814D1 (de) 1996-01-11
DK0401098T3 (da) 1996-02-26
JPH0324251A (ja) 1991-02-01
EP0401098A1 (fr) 1990-12-05
FR2647813B1 (fr) 1991-09-20

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