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41. 发明专利

JP2000129355A PRODUCTION OF GRAIN ORIENTED SILICON STEEL SHEET 失效
公开(公告)号：JP2000129355A
公开(公告)日：2000-05-09
申请号：JP30772598
申请日：1998-10-29
申请人： KAWASAKI STEEL CO
发明人： KAMI TSUTOMU , TOGE TETSUO , HONDA ATSUTO
IPC分类号： H01F1/16 , C21D3/04 , C21D8/12 , C22C38/00 , C22C38/06 , C22C38/60 , C25D13/02
摘要： PROBLEM TO BE SOLVED: To obtain a steel sheet excellent in magnetic properties and the uniformity and adhesion of a forsterite glass coating film by forming a surface oxidizing layer on the surface of a steel sheet in such a manner that the potential variation and electrolyzing time in the 3rd region of a secular change are controlled to specified ranges. SOLUTION: A steel slab having a compsn. contg., by weight 0.02 to 0.07% C, 2.0 to 4.5% Si, 0.03 to 2.5% Mn, 0.003 to 0.050% Al, 0.0030 to 0.01% N, = two kinds selected from Sb, Sn, Cu, Cr, Ge and Bi by 0.003 to 0.3% is heated at

42. 发明专利

JPH11302730A PRODUCTION OF GRAIN-ORIENTED SILICON STEEL SHEET EXCELLENT IN COATING CHARACTERISTIC AND LOW MAGNETIC FIELD CHARACTERISTIC 失效
公开(公告)号：JPH11302730A
公开(公告)日：1999-11-02
申请号：JP11479098
申请日：1998-04-24
申请人： KAWASAKI STEEL CO
发明人： WATANABE MAKOTO , KAMI TSUTOMU , HONDA ATSUTO , TOGE TETSUO
IPC分类号： C23C22/00 , C21D8/12 , C21D9/46 , C22C38/00 , C22C38/06 , H01F1/16
摘要： PROBLEM TO BE SOLVED: To form a good coating film without causing deterioration in magnetic characteristics in a low magnetic field by using a steel ingot of a specified compsn., controlling the primary recrystallization grain size to a specified range, and applying an annealing separating agent which essentially consists of MgO having a specified range of specific surface area and which contains specified ranges of Ca, Sr and Ba. SOLUTION: A steel ingot containing by wt.%, 0.005 to 0.070 C; 1.5 to 7.0 Si; 0.03 to 2.50 Mn; 0.005 to 0.017 Al and 0.003 to 0.010 N is heated at /g specific surface area by BET method which essentially consists of MgO and contains one or more kinds of Ca, Sr and Ba compds. in total 0.03 to 3 wt.% calculated as metals is applied on the sheet, dried and subjected to finish annealing.

43. 发明专利

JPH11158558A MAGNESIUM OXIDE FOR ANNEALING-SEPARATING AGENT AND PRODUCTION THEREOF 失效
公开(公告)号：JPH11158558A
公开(公告)日：1999-06-15
申请号：JP33008197
申请日：1997-12-01
申请人： KAWASAKI STEEL CO
发明人： KOMATSUBARA MICHIRO , WATANABE MAKOTO , KAMI TSUTOMU
IPC分类号： C01F5/06 , C21D1/70 , C21D9/46
摘要： PROBLEM TO BE SOLVED: To obtain an MgO for annealing-separating agent used for the production of a grain oriented electrical steel sheet with which the grain oriented electrical steel sheet having stable and excellent quity characteristic is produced. SOLUTION: By hydrating MgO, Mg(OH)2 having 4.0-15.0 m /g specific surface, 25-150 nm average diameter of (c) axis in a crystallite and 50-120 nm average diameter of (a) axis therein is obtd., and the resultant Mg(OH)2 is sintered to produce MgO having the characteristics satisfying 60-100 sec interval of 40% CAA, 250-400 sec interval of 80% CAA, 12-35 m /g specific surface and 0.7-1.8 wt% Ig. loss.

44. 发明专利

JPH1161261A MANUFACTURE OF GRAIN-ORIENTED ELECTRICAL STEEL SHEET EXCELLENT IN MAGNETIC CHARACTERISTIC 失效
公开(公告)号：JPH1161261A
公开(公告)日：1999-03-05
申请号：JP21431397
申请日：1997-08-08
申请人： KAWASAKI STEEL CO
发明人： TAKASHIMA MINORU , KAMI TSUTOMU , KOMATSUBARA MICHIRO
IPC分类号： C21D8/12 , C21D9/46 , H01F1/16
摘要： PROBLEM TO BE SOLVED: To provide the grain-oriented electrical steel sheet to efficiently enable the extremely low iron loss through the magnetic smoothing treatment by using the slab containing Sb in the prescribed content and the separation agent for annealing containing SiO2 , Al2 O3 in the prescribed ratio. SOLUTION: The grain-oriented electrical steel sheet to be used is required to contains, by weight, 0.035-0.10% Sb. After the slab is heated, it is hot rolled, and then, the annealing is combined with the cold rolling. A cold rolled steel sheet of the final thickness is decarburization-annealed, and the separation agent for annealing is applied, and the magnetic smoothing treatment is achieved after the secondary recrystallization annealing. The separation agent for annealing mainly consists of SiO2 and Al2 O3 , and the weight ratio of [SiO2 ]/[Al2 O3 ] is 0.5-10, and MgO is on one side in oxygen unit weight, and roughness Ra of

45. 发明专利

JPH10195536A PRODUCTION OF GRAIN ORIENTED SILICON STEEL SHEET 失效
公开(公告)号：JPH10195536A
公开(公告)日：1998-07-28
申请号：JP45097
申请日：1997-01-07
申请人： KAWASAKI STEEL CO
发明人： KAMI TSUTOMU , WATANABE MAKOTO
IPC分类号： C21D8/12 , C21D9/46
摘要： PROBLEM TO BE SOLVED: To stably obtain a grain oriented silicon steel sheet excellent in glass coating characteristics and magnetic properties, at the time of producing a grain oriented silicon steel sheet from a silicon-contg. steel by a series of process, by regulating the content of Si and the content of O in a surface oxidizing layer of a process-annealed layer to prescribed ranges. SOLUTION: A silicon-contg. steel is subjected to hot rolling, is thereafter subjected to cold rolling for two times including process annealing, is subjected to final finishing, is next subjected to decarburizing annealing in wet hydrogen, is thereafter applied with separation agent for annealing and is subjected to finish annealing to produce a grain oriented silicon steel sheet. At this time, the content of Si and the content of O in a surface oxidizing layer of the process-annealed sheet are measured by glow discharge spectrometry, and at least one condition among the cooling atmosphere, grinding conditions and pickling conditions after the process annealing is controlled so as to regulate each integrated intensity ratio thereof is regulated to 0.7 to 1.2 and 0.95 to 1.12. In this way, the grain oriented silicon steel sheet stable in coating quality and magnetic properties can advantageously be obtd.

46. 发明专利

JPH1088243A PRODUCTION OF GRAIN ORIENTED SILICON STEEL SHEET EXCELLENT IN FORSTERITE GLASS FILM CHARACTERISTIC 失效
公开(公告)号：JPH1088243A
公开(公告)日：1998-04-07
申请号：JP24045496
申请日：1996-09-11
申请人： KAWASAKI STEEL CO
发明人： KAMI TSUTOMU , WATANABE MAKOTO , KOMATSUBARA MICHIRO
IPC分类号： C21D9/46 , H01F1/147 , H01F1/16
摘要： PROBLEM TO BE SOLVED: To produce a grain oriented silicon steel sheet having excellent film characteristic and magnetic properties by specifying the relation between a surface oxide layer formed by means of decarburizing annealing on the surface of a stock for grain oriented silicon steel sheet and magnesia in a separation agent at annealing by a specific inequality. SOLUTION: A separation agent at annealing, composed essentially of magnesia, is applied to the surface of a stock for grain oriented silicon steel sheet after decarburizing annealing and then high temp. annealing is performed, by which a forsterite film is formed on the surface of the stock steel sheet. At this time, the relation between a surface oxide layer formed by decarbutizing annealing on the surface of the stock for grain oriented silicon steel sheet and magnesia in the separation agent at annealing is apecified so that it satisfies the condition of inequality 7.0.EXP(0.035×C) ), C(%), and (t)(sec) represent the oxygen coating weight of the surface oxide layer, each final reaction ratio when the citric acid activity of magnesia is measured between 20 and 80% of final reaction ratio, and the time from the initiation of reaction to the completion of reaction at each final reaction ratio, respectively.

47. 发明专利

JPH108141A PRODUCTION OF GRAIN ORIENTED SILICON STEEL SHEET EXCELLENT IN PUNCHABILITY AND MAGNETIC PROPERTY 失效
公开(公告)号：JPH108141A
公开(公告)日：1998-01-13
申请号：JP15798096
申请日：1996-06-19
申请人： KAWASAKI STEEL CO
发明人： KAMI TSUTOMU , WATANABE MAKOTO
IPC分类号： C21D9/46 , H01F1/16
摘要： PROBLEM TO BE SOLVED: To produce a film-free grain oriented silicon steel sheet without causing inferior secondary recrystallization by adding, as an auxiliary, an oxide for increasing the oxygen potential 6f the atmosphere among coil layers in the course of finish annealing to a separation agent at annealing. SOLUTION: Decarburizing annealing is applied to a cold rolled steel sheet to form an oxide layer on the surface of the steel sheet. Subsequently, a separation agent at annealing, which is composed essentially of MgO, Al2 O3 , and SiO and to which an auxiliary for increasing the oxygen potential of the atmosphere among coil layers in the course of finish annealing is added, is applied, followed by coiling. Then, a film composed of Mg-Al-Si-0 type silicate compound is formed during annealing. At the time of temp. fall in the final stage of successive annealing, finish annealing for peeling the film by the thermal stress occurring between the film and the steel sheet is carried out, by which the grain oriented silicon steel sheet is obtained. As the auxiliary to be added to the separation agent at annealing, one or >=2 kinds among Bi2 O3 , Cub, Fe2 O3 , SnO2 , Tl2 O3 , and ZnO are used in combination.

48. 发明专利

JPH09316654A PRODUCTION OF GRAIN ORIENTED SILICON STEEL SHEET 失效
公开(公告)号：JPH09316654A
公开(公告)日：1997-12-09
申请号：JP13625396
申请日：1996-05-30
申请人： KAWASAKI STEEL CO
发明人： WATANABE MAKOTO , KAMI TSUTOMU , SATO KEIJI
IPC分类号： B05D1/28 , C21D8/12 , C21D9/46 , C22C38/00 , C22C38/02 , C23C22/00 , H01F1/147 , H01F1/18
摘要： PROBLEM TO BE SOLVED: To remarkably contribute to the improvement of the quality of a grain oriented silicon steel sheet by regulating the gravity number of a slurry shaped separation agent for annealing to a specified range at the time of applying the same. SOLUTION: A slab for a grain oriented steel sheet contains, by weight, 0.02 to 0.1% C and 2 to 4.5% Si. This is subjected to hot rolling and cold rolling including process annealing to regulate its sheet thickness into a final one. After that, it is subjected to primary recrystallization annealing, is thereafter applied with a separation agent for annealing and is subjected to final finish annealing, where the gravity number Ng expressed by the formula I at the time of applying the slurry-shaped separation agent for annealing is regulated to the range of 1.0×10 to 1.5×10 . In the formula I, Ng denotes the gravity number of the slurry-shaped separation agent for annealing, Re denotes the Reynolds number, and Fr denotes the Froude number. In this way, the grain oriented silicon steel sheet good in magnetic properties and coating characteristics can be produced.

49. 发明专利

JPH08252505A PREPARATION OF SLURRY OF SEPARATION AGENT FOR ANNEALING OF ELECTRICAL STEEL SHEET AND ITS APPLICATOR 失效
公开(公告)号：JPH08252505A
公开(公告)日：1996-10-01
申请号：JP5858395
申请日：1995-03-17
申请人： KAWASAKI STEEL CO
发明人： KAMI TSUTOMU , WATANABE MAKOTO
IPC分类号： B05C9/10 , B05C11/10 , C23C22/00 , C23C22/74
摘要： PURPOSE: To make it possible to prevent the unequal formation of films and to prevent the deformation of a coil by irradiating a slurry of a sepn. agent for annealing with specific ultrasonic waves, then, applying the slurry on the surface of a grain oriented electrical steel sheet after decarburization annealing. CONSTITUTION: A sepn. agent raw material 21 and water 22 are mixed in a compounding tank 1 and the mixture is sent to a stirring tank 2. The mixture is self-circulated under stirring via a bypass 16 in the tank, by which the hydration amt. of MgO is controlled. The slurry is sent to a circulating tank 3 after the adjustment of the hydration rate of the stirring tank 2. While the slurry in the circulating tank 3 is self-circulated by a bypass 18, the slurry is supplied by a piping 19 to a slurry spray nozzle 13 and is applied on a strip 11. Ultrasonic irradiation devices 5 to 10 are arranged in the pipings 15, 17, 19, bypasses 16, 18 and return piping 20 of the slurry circulation system from the compounding tank 1 to the circulating tank 3 and the coating section 14, and the slurry is irradiated with ultrasonic waves of total irradiation energy of >=1×10 J/m . As a result, the flocculated particles in the slurry are destroyed and, therefore, the coating thickness and slipperiness of the sheet surfaces are made uniform and the coil deformation, etc., during annealing are prevented.

50. 发明专利

JPH08143963A PRODUCTION OF GRAIN ORIENTED SILICON STEEL SHEET 失效
公开(公告)号：JPH08143963A
公开(公告)日：1996-06-04
申请号：JP28956094
申请日：1994-11-24
申请人： KAWASAKI STEEL CO
发明人： ISHITOBI HIROTAKE , SUZUKI TAKASHI , KAMI TSUTOMU
IPC分类号： C21D8/12 , C21D9/46 , C22C38/00 , C22C38/02 , C22C38/60 , H01F1/16
摘要： PURPOSE: To produce a grain oriented silicon steel sheet having a uniform film free from defects and excellent in adhesion and also having superior magnetic properties by regulating the combination of the composition of oxide at the subscale surface of a decarburizing-annealed sheet with the coating weight of oxygen to specific range. CONSTITUTION: A grain oriented silicon steel stock, containing, by weight, 0.02-0.10% Ca nd 2.0-4.5% Si, is cold-rolled once or is cold-rolled twice while process-annealed between the cold rolling stages to the final sheet thickness. After decarburizing annealing, a separation agent at annealing is applied to the resulting steel sheet and final finish annealing is performed, by which the grain oriented silicon steel sheet is produced. In this method, the oxide layer formed on the steel sheet surface at the time of decarburizing annealing is regulated to (0.7 to 2.5)g/m expressed in terms of O, and also the amount of FeSi3 in this oxide layer is regulated so that it is larger than the amount of Fe2 SiO4 . For this purpose, an Si compound is allowed to adhere to the surface of the steel sheet before decarburizing annealing, and the atmosphere at temp. rise is regulated so that it is less oxidiing than the atmosphere at soaking at the time of decarburizing annealing. By this method, the desired grain oriented silicon steel sheet, free from defects over the whole width and whole length of coil, can be obtained.

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