WO1998041660A1 - Process for the inhibition control in the production of grain-oriented electrical sheets - Google Patents
Process for the inhibition control in the production of grain-oriented electrical sheets Download PDFInfo
- Publication number
- WO1998041660A1 WO1998041660A1 PCT/EP1997/004089 EP9704089W WO9841660A1 WO 1998041660 A1 WO1998041660 A1 WO 1998041660A1 EP 9704089 W EP9704089 W EP 9704089W WO 9841660 A1 WO9841660 A1 WO 9841660A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hot
- grain
- ppm
- manganese
- temperature
- Prior art date
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Classifications
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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
- C21D8/1216—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
- C21D8/1222—Hot rolling
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
-
- 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
-
- 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
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- 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
- C21D8/1255—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 with diffusion of elements, e.g. decarburising, nitriding
Definitions
- the present invention refers to a process for the inhibition control in the production of grain-oriented electrical sheets and, more precisely, refers to a process by which, through control of manganese, sulphur, aluminium and carbon content, type and quantities of precipitated second phases are determined since the hot-rolled strip, to obtain optimum grain size during the decarburization annealing and some degree of inhibition, thus allowing to carry out a subsequent continuous high-temperature heat treatment in which aluminium as nitride is directly precipitated by diffusing nitrogen along the strip thickness, in order to obtain the second phases ratio necessary to control the grain orientation of the final product.
- Grain-oriented silicon steels for magnetic uses are normally classified into two groups, essentially differentiated by the induction value induced by a magnetic field of 800 As/m and know as "B800" : the conventional grain-oriented group, where B800 is lower than 1890 mT, and the high-permeability grain-oriented group, where B ⁇ OO is higher than 1900 mT. Further subdivisions are depending on the so- called “core-losses”, expressed as W/kg.
- precipitates inhibitors, also called “second phases”
- second phases precipitates of suitable sizes and distribution, which reduce grain boundary mobility, during the final static annealing a selective growth of the sole grains having the wanted orientation is obtained; the higher the dissolution temperature of said precipitates into the steel, the higher the ability of limiting the grain growth for higher cold rolling rates, the higher the grain orientation and the better the magnetic characteristics of the final product.
- Manganese sulphide and/or selenide are the predominant inhibitors in a grain- oriented steel and the process normally provides for a two-step cold- rolling, while precipitates including nitrogen linked to aluminium (referred to as "aluminium nitride" for simplicity purposes) are the predominant inhibitors in a grain-super-oriented steel and the cold- rolling process is normally a one-step one.
- the aluminium nitride, coarsely precipitated during the slow steel solidification is maintained into said state by using low slab-heating temperatures (lower than 12 ⁇ 0 °C, preferably lower than 1250 °C) before the hot- rolling.
- Nitrogen is introduced after the decarburization annealing, which reacts immediately to produce (essentially near the strip surface) silicon or manganese/silicon nitrides having comparatively low solution temperature, which are dissolved during the final annealing in box-annealing furnaces ; the nitrogen so released diffuses into the sheet, reacts with the aluminium and precipitates again on the whole strip thickness in a thin and homogeneous form as mixed aluminium and silicon nitrides; said process involves that the material stays at 700-800 °C for at least four hours.
- the above process has some disadvantages as: (i) the selected composition and the low slab-heating temperature involve that the sheet includes practically no precipitates inhibiting the grain growth: all the heating steps of the strip, and in particular those belonging to the decarburization and to the nitriding steps, must be taken at comparatively low and critically controlled temperatures, in that at the above conditions grain boundaries are very mobile involving the risk of an uncontrolled grain growth; (ii) the nitrogen introduced is .
- Applicant process is disclosed by Applicant's Italian patent Applications n. RM96A000600, RM96AOOO6O6, RM96A000903, RM96A000904, RM96A000905.
- Object of the present invention is to overcome the disadvantages of the production processes already known and to further improve the technology disclosed by the above mentioned Italian patent Applications by disclosing a process for creating and for controlling, since the hot-rolling step, a system of various inhibitors suitable to make less critical most of the production steps (with particular reference to the careful control of the heating temperature) to obtain optimum grain sizes during the primary recrystallisation and a deep penetration of the nitrogen into the strip to directly form aluminium nitride.
- the present invention through a suitable combination of contents of manganese and of sulphur it is possible to make easier (according to the innovative technology disclosed by the above mentioned Applicant's Italian patent Applications) the production of silicon steel sheets both of grain-oriented type and of grain super- oriented type.
- Iz 1.91 Fv/r where Fv is the volume fraction of useful precipitates and r is the mean radius of said precipitates.
- the inhibition levels so generated are such as to allow, together with the assumed process parameters, a continuous and controlled grain growth before the secondary recrystallisation.
- the manganese content is controlled in the 500-1000 ppm range .
- the ratio between the weight per-cent contents of manganese and of sulphur is preferably maintained between 2 and 10.
- the steel can include some impurities, in particular chromium, nickel and molybdenum, whose total weight per-cent content should be preferably lower than 0.35 % •
- the continuously cast slabs are heated between 1100 °C and 1300 °C, preferably between 1150 °C and 1250 °C, and hot-rolled with an initial rolling temperature of between 1000 °C and 1150 °C, a final rolling temperature of between 900 °C and 1000 °C and a coiling temperature of between 550 °C and 720 °C. Then, the strip is cold-rolled at the desired final thickness and undergoes a primary recrystallisation annealing at ⁇ 50-900 °C and a nitriding, normally at 900-1050 °C.
- the reduced content of free manganese in solid solution characterising the composition of the present invention, allows nitrogen, added to the strip by high-temperature nitriding, to diffuse towards the strip core and to precipitate directly the aluminium included into the matrix.
- the precipitate's analysis made after the nitriding step shows that the nitrogen added to the strip precipitates as aluminium nitrides on existing, homogeneously distributed thin sulphides, which act therefore as activators and regulators of the added inhibition.
- the strip, coated with MgO-based annealing separators and coiled, is box-annealed by heating it up to 1210 °C under a nitrogen/hydrogen atmosphere and keeping it for at least 10 hours at said temperature under an hydrogen atmosphere.
- EXAMPLE # I A steel including Si 3.15 % by weight, C 230 ppm, Mn 650 ppm, S 140 ppm, Al s 320 ppm, N 82 ppm, Cu 1000 ppm, Sn 530 ppm, Cr 200 ppm, Mo 100 ppm, Ni 400 ppm, Ti 20 ppm, P 100 ppm has been continuously cast and the slabs have been heated up to 1150 °C and hot-rolled to a thickness of 2.2 mm with an initial rolling temperature of 1055 °C and a final rolling temperature of 915 °C to have an effective inhibition of about 700 cm " . The strips have been then cold-rolled up to thicknesses of 0.22, 0.26 and 0.29 mm.
- the cold-rolled strips have been continuously annealed at ⁇ O °C for about 120 seconds under a nitrogen/hydrogen atmosphere with a dew-point of 6 ⁇ °C and immediately after they have been continuously annealed at 96 ⁇ °C for about 15 seconds under a nitrogen/hydrogen atmosphere with a dew-point of 10 °C, adding ammonia at the furnace input to increase of 20-50 ppm the nitrogen content of the strips.
- the annealed strips, coated with MgO-based annealing separators and coiled have been box-annealed according to the following cycle: fast heating up to 700 °C, 15 hours pause at said temperature, heating at 40 °C/h up to 1200 °C, 10 hours pause at said temperature, free cooling. Magnetic characteristics of said strips are: TABLE # 1 thickness (mm) B ⁇ OO (mT) P17 (W/kg)
- Slabs have been heated up to 1150 C C, bloomed down to a 40 mm thickness and then hot-rolled to a thickness of 2.2-2.3 mm.
- the hot- rolled strips have been cold-rolled to a thickness of 0.30 mm, decarburized at ⁇ 70 °C and then nitrided at 930 °C for 30 seconds under a nitrogen/hydrogen atmosphere with a dew-point of 10 °C, adding ⁇ % by weight of ammonia at the furnace input.
- the nitrided strips have been coated with MgO-based annealing separators and box-annealed according to the following cycle: fast heating up to 700 °C, 10 hours pause at said temperature, heating at 40 °C/h up to 1210 °C under a nitrogen/hydrogen atmosphere, 15 hours pause at said temperature under a hydrogen atmosphere and cooling.
- EXAMPLE # 3 From a casting including iron, Si 3-3 % by weight, C 350 ppm, Al g 290 ppm, N 70 ppm, Mn 65O ppm, S l ⁇ O ppm, Cu 1400 ppm and minor impurities, slabs have been produced: some slabs have been treated at 1320 °C (RA) and the rest at 1190 °C (RB) before being hot-rolled to a thickness of 2.2 mm. The strips have been annealed at 900 °C and cooled by water and vapour from 7 ⁇ 0 °C. By analysing the mean content of inhibition into the matrix of hot-rolled annealed strips, for strips RA a value of about 1400 cm have been found, while for strips RB a value of about ⁇ OO cm have been found.
- the hot-rolled strips have been cold-rolled to a thickness of 0.27 mm, annealed for primary recristallization at ⁇ 50 °C and nitrided at 970 °C.
- the nitrided cold-rolled strips have been box- annealed for secondary recrystallisation according to the following cycle: heating at 40 °C/h from 700 °C to 1200 °C under a nitrogen/hydrogen atmosphere, 20 hours pause at 1200 °C under a hydrogen atmosphere and cooling.
- losses of strips realised from low-temperature annealed slabs are very constant, while those realised from high-temperature annealed slabs are very unsteady and oscillate cyclically between 1.00 and 1.84 W/kg.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Electromagnetism (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
- Soft Magnetic Materials (AREA)
- Medicines Containing Plant Substances (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
- Measuring Magnetic Variables (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Epoxy Compounds (AREA)
- Coating With Molten Metal (AREA)
- Metal Rolling (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
Description
Claims
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL97335654A PL182837B1 (en) | 1997-03-14 | 1997-07-28 | Method of controllably inhibiting a process occuring in a textured electromagnetic steel sheet |
SK1224-99A SK284361B6 (en) | 1997-03-14 | 1997-07-28 | Process for the inhibition control in the production of grain-oriented electrical sheets |
BR9714629-3A BR9714629A (en) | 1997-03-14 | 1997-07-28 | Process for controlling inhibition in the production of grain-oriented electric plates |
EP97936665A EP0966548B1 (en) | 1997-03-14 | 1997-07-28 | Process for the inhibition control in the production of grain-oriented electrical sheets |
JP54004998A JP2001515541A (en) | 1997-03-14 | 1997-07-28 | Suppression control method during production of grain oriented electrical sheet |
US09/381,105 US6361621B1 (en) | 1997-03-14 | 1997-07-28 | Process for the inhibition control in the production of grain-oriented electrical sheets |
AU39413/97A AU3941397A (en) | 1997-03-14 | 1997-07-28 | Process for the inhibition control in the production of grain-oriented electrical sheets |
DE69707159T DE69707159T2 (en) | 1997-03-14 | 1997-07-28 | METHOD FOR REGULATING INHIBITION IN THE PRODUCTION OF CORNORIENTED ELECTROPLATES |
KR1019997008329A KR100561144B1 (en) | 1997-03-14 | 1997-07-28 | Process for the inhibition control in the production of grain-oriented electrical sheets |
AT97936665T ATE206474T1 (en) | 1997-03-14 | 1997-07-28 | METHOD FOR CONTROLLING INHIBITION IN PRODUCING GORNO-ORIENTED ELECTRICAL SHEET |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITRM97A000147 | 1997-03-14 | ||
IT97RM000147A IT1290978B1 (en) | 1997-03-14 | 1997-03-14 | PROCEDURE FOR CHECKING THE INHIBITION IN THE PRODUCTION OF GRAIN ORIENTED MAGNETIC SHEET |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998041660A1 true WO1998041660A1 (en) | 1998-09-24 |
Family
ID=11404861
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/004089 WO1998041660A1 (en) | 1997-03-14 | 1997-07-28 | Process for the inhibition control in the production of grain-oriented electrical sheets |
Country Status (16)
Country | Link |
---|---|
US (1) | US6361621B1 (en) |
EP (1) | EP0966548B1 (en) |
JP (1) | JP2001515541A (en) |
KR (1) | KR100561144B1 (en) |
CN (1) | CN1089373C (en) |
AT (1) | ATE206474T1 (en) |
AU (1) | AU3941397A (en) |
BR (1) | BR9714629A (en) |
CZ (1) | CZ295534B6 (en) |
DE (1) | DE69707159T2 (en) |
ES (1) | ES2165081T3 (en) |
IT (1) | IT1290978B1 (en) |
PL (1) | PL182837B1 (en) |
RU (1) | RU2195506C2 (en) |
SK (1) | SK284361B6 (en) |
WO (1) | WO1998041660A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002012572A1 (en) * | 2000-08-09 | 2002-02-14 | Thyssenkrupp Acciai Speciali Terni S.P.A. | Process for the control of inhibitors distribution in the production of grain oriented electrical steel strips |
WO2002050314A2 (en) * | 2000-12-18 | 2002-06-27 | Thyssenkrupp Acciai Speciali Terni S.P.A. | Process for the production of grain oriented electrical steel strips |
US6488784B1 (en) | 1998-03-10 | 2002-12-03 | Acciai Speciali Terni S.P.A. | Process for the production of grain oriented electrical steel strips |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2318883C2 (en) * | 2002-05-08 | 2008-03-10 | Эй-Кей СТИЛ ПРОПЕРТИЗ ИНК | Non-oriented electrical steel strip continuous casting method |
US20050000596A1 (en) * | 2003-05-14 | 2005-01-06 | Ak Properties Inc. | Method for production of non-oriented electrical steel strip |
CN102127708A (en) * | 2011-01-16 | 2011-07-20 | 首钢总公司 | Method for producing oriented electrical steel by heating low-temperature slab |
CN104894354B (en) * | 2015-06-09 | 2017-11-10 | 北京科技大学 | A kind of Low Temperature Hot Rolling plate prepares the production method of Thin Specs high magnetic induction grain-oriented silicon steel |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US3671337A (en) * | 1969-02-21 | 1972-06-20 | Nippon Steel Corp | Process for producing grain oriented electromagnetic steel sheets having excellent magnetic characteristics |
US3872704A (en) * | 1971-12-24 | 1975-03-25 | Nippon Steel Corp | Method for manufacturing grain-oriented electrical steel sheet and strip in combination with continuous casting |
EP0125653A1 (en) * | 1983-05-12 | 1984-11-21 | Nippon Steel Corporation | Process for producing a grain-oriented electrical steel sheet |
EP0339474A1 (en) * | 1988-04-25 | 1989-11-02 | Nippon Steel Corporation | Process for preparation of grain-oriented electrical steel sheet having excellent magnetic and film characteristics |
DE4311151C1 (en) * | 1993-04-05 | 1994-07-28 | Thyssen Stahl Ag | Grain-orientated electro-steel sheets with good properties |
EP0732413A1 (en) * | 1995-03-14 | 1996-09-18 | USINOR SACILOR Société Anonyme | Process for manufacturing grain oriented electrical steel sheets for transformers |
Family Cites Families (17)
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US5472521A (en) * | 1933-10-19 | 1995-12-05 | Nippon Steel Corporation | Production method of grain oriented electrical steel sheet having excellent magnetic characteristics |
JPS5933170B2 (en) | 1978-10-02 | 1984-08-14 | 新日本製鐵株式会社 | Method for manufacturing aluminum-containing unidirectional silicon steel sheet with extremely high magnetic flux density |
US5759293A (en) * | 1989-01-07 | 1998-06-02 | Nippon Steel Corporation | Decarburization-annealed steel strip as an intermediate material for grain-oriented electrical steel strip |
JPH0730397B2 (en) * | 1990-04-13 | 1995-04-05 | 新日本製鐵株式会社 | Method for producing unidirectional electrical steel sheet with excellent magnetic properties |
JP2519615B2 (en) * | 1991-09-26 | 1996-07-31 | 新日本製鐵株式会社 | Method for producing grain-oriented electrical steel sheet with excellent magnetic properties |
KR960010811B1 (en) * | 1992-04-16 | 1996-08-09 | 신니뽄세이데스 가부시끼가이샤 | Process for production of grain oriented electrical steel sheet having excellent magnetic properties |
US5507883A (en) * | 1992-06-26 | 1996-04-16 | Nippon Steel Corporation | Grain oriented electrical steel sheet having high magnetic flux density and ultra low iron loss and process for production the same |
JP3240035B2 (en) * | 1994-07-22 | 2001-12-17 | 川崎製鉄株式会社 | Manufacturing method of grain-oriented silicon steel sheet with excellent magnetic properties over the entire coil length |
JP3598590B2 (en) * | 1994-12-05 | 2004-12-08 | Jfeスチール株式会社 | Unidirectional electrical steel sheet with high magnetic flux density and low iron loss |
US5643370A (en) * | 1995-05-16 | 1997-07-01 | Armco Inc. | Grain oriented electrical steel having high volume resistivity and method for producing same |
IT1284268B1 (en) | 1996-08-30 | 1998-05-14 | Acciai Speciali Terni Spa | PROCEDURE FOR THE PRODUCTION OF GRAIN ORIENTED MAGNETIC SHEETS, WITH HIGH MAGNETIC CHARACTERISTICS, STARTING FROM |
IT1285153B1 (en) | 1996-09-05 | 1998-06-03 | Acciai Speciali Terni Spa | PROCEDURE FOR THE PRODUCTION OF GRAIN ORIENTED MAGNETIC SHEET, STARTING FROM THIN SHEET. |
US5885371A (en) * | 1996-10-11 | 1999-03-23 | Kawasaki Steel Corporation | Method of producing grain-oriented magnetic steel sheet |
IT1290172B1 (en) | 1996-12-24 | 1998-10-19 | Acciai Speciali Terni Spa | PROCEDURE FOR THE PRODUCTION OF GRAIN ORIENTED MAGNETIC SHEETS, WITH HIGH MAGNETIC CHARACTERISTICS. |
IT1290171B1 (en) | 1996-12-24 | 1998-10-19 | Acciai Speciali Terni Spa | PROCEDURE FOR THE TREATMENT OF SILICON, GRAIN ORIENTED STEEL. |
IT1290173B1 (en) | 1996-12-24 | 1998-10-19 | Acciai Speciali Terni Spa | PROCEDURE FOR THE PRODUCTION OF GRAIN ORIENTED SILICON STEEL SHEETS |
US6049933A (en) * | 1997-08-12 | 2000-04-18 | Zodiac Pool Care, Inc. | Bumper assemblies for swimming pool cleaners |
-
1997
- 1997-03-14 IT IT97RM000147A patent/IT1290978B1/en active IP Right Grant
- 1997-07-28 CN CN97182038A patent/CN1089373C/en not_active Expired - Fee Related
- 1997-07-28 AT AT97936665T patent/ATE206474T1/en active
- 1997-07-28 US US09/381,105 patent/US6361621B1/en not_active Expired - Lifetime
- 1997-07-28 BR BR9714629-3A patent/BR9714629A/en not_active IP Right Cessation
- 1997-07-28 RU RU99121662/02A patent/RU2195506C2/en not_active IP Right Cessation
- 1997-07-28 AU AU39413/97A patent/AU3941397A/en not_active Abandoned
- 1997-07-28 WO PCT/EP1997/004089 patent/WO1998041660A1/en active IP Right Grant
- 1997-07-28 JP JP54004998A patent/JP2001515541A/en active Pending
- 1997-07-28 ES ES97936665T patent/ES2165081T3/en not_active Expired - Lifetime
- 1997-07-28 PL PL97335654A patent/PL182837B1/en unknown
- 1997-07-28 KR KR1019997008329A patent/KR100561144B1/en not_active IP Right Cessation
- 1997-07-28 CZ CZ19993250A patent/CZ295534B6/en not_active IP Right Cessation
- 1997-07-28 SK SK1224-99A patent/SK284361B6/en not_active IP Right Cessation
- 1997-07-28 EP EP97936665A patent/EP0966548B1/en not_active Expired - Lifetime
- 1997-07-28 DE DE69707159T patent/DE69707159T2/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3671337A (en) * | 1969-02-21 | 1972-06-20 | Nippon Steel Corp | Process for producing grain oriented electromagnetic steel sheets having excellent magnetic characteristics |
US3872704A (en) * | 1971-12-24 | 1975-03-25 | Nippon Steel Corp | Method for manufacturing grain-oriented electrical steel sheet and strip in combination with continuous casting |
EP0125653A1 (en) * | 1983-05-12 | 1984-11-21 | Nippon Steel Corporation | Process for producing a grain-oriented electrical steel sheet |
EP0339474A1 (en) * | 1988-04-25 | 1989-11-02 | Nippon Steel Corporation | Process for preparation of grain-oriented electrical steel sheet having excellent magnetic and film characteristics |
DE4311151C1 (en) * | 1993-04-05 | 1994-07-28 | Thyssen Stahl Ag | Grain-orientated electro-steel sheets with good properties |
EP0732413A1 (en) * | 1995-03-14 | 1996-09-18 | USINOR SACILOR Société Anonyme | Process for manufacturing grain oriented electrical steel sheets for transformers |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US6488784B1 (en) | 1998-03-10 | 2002-12-03 | Acciai Speciali Terni S.P.A. | Process for the production of grain oriented electrical steel strips |
WO2002012572A1 (en) * | 2000-08-09 | 2002-02-14 | Thyssenkrupp Acciai Speciali Terni S.P.A. | Process for the control of inhibitors distribution in the production of grain oriented electrical steel strips |
US7192492B2 (en) | 2000-08-09 | 2007-03-20 | Thyssenkrupp Acciai Speciali Terni S.P.A. | Process for the control of inhibitors distribution in the production of grain oriented electrical steel strips |
KR100831756B1 (en) * | 2000-08-09 | 2008-05-23 | 티센크룹 악키아이 스페시알리 테르니 에스. 피. 에이. | Process for the control of inhibitors distribution in the production of grain oriented electrical steel strips |
WO2002050314A2 (en) * | 2000-12-18 | 2002-06-27 | Thyssenkrupp Acciai Speciali Terni S.P.A. | Process for the production of grain oriented electrical steel strips |
WO2002050314A3 (en) * | 2000-12-18 | 2002-08-22 | Thyssenkrupp Acciai Speciali | Process for the production of grain oriented electrical steel strips |
US6893510B2 (en) | 2000-12-18 | 2005-05-17 | Thyssenkrupp Acciai Speciali Terni S.P.A. | Process for the production of grain oriented electrical steel strips |
Also Published As
Publication number | Publication date |
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DE69707159D1 (en) | 2001-11-08 |
CZ9903250A3 (en) | 2001-07-11 |
SK284361B6 (en) | 2005-02-04 |
IT1290978B1 (en) | 1998-12-14 |
ATE206474T1 (en) | 2001-10-15 |
US6361621B1 (en) | 2002-03-26 |
KR20000076234A (en) | 2000-12-26 |
BR9714629A (en) | 2000-03-28 |
RU2195506C2 (en) | 2002-12-27 |
ES2165081T3 (en) | 2002-03-01 |
DE69707159T2 (en) | 2002-06-06 |
ITRM970147A1 (en) | 1998-09-14 |
CN1089373C (en) | 2002-08-21 |
AU3941397A (en) | 1998-10-12 |
KR100561144B1 (en) | 2006-03-15 |
EP0966548A1 (en) | 1999-12-29 |
PL182837B1 (en) | 2002-03-29 |
PL335654A1 (en) | 2000-05-08 |
SK122499A3 (en) | 2000-05-16 |
CZ295534B6 (en) | 2005-08-17 |
EP0966548B1 (en) | 2001-10-04 |
CN1249007A (en) | 2000-03-29 |
JP2001515541A (en) | 2001-09-18 |
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