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61. 发明专利

JPH07268471A PRODUCTION OF GRAIN ORIENTED SILICON STEEL SHEET HAVING HIGH MAGNETIC FLUX DENSITY 失效
公开(公告)号：JPH07268471A
公开(公告)日：1995-10-17
申请号：JP6231994
申请日：1994-03-31
申请人： KAWASAKI STEEL CO
发明人： NAKANO HISASHI , IWAMOTO KATSUO , OBARA TAKASHI , TAKAMIYA TOSHITO
IPC分类号： B21B3/02 , C21D8/12 , C22C38/00
摘要： PURPOSE:To stably produce a grain oriented silicon steel sheet having high magnetic flux density by specifying a chemical composition, hot finish rolling conditions, and cold rolling conditions. CONSTITUTION:A silicon steel, which has a composition containing, by weight, 0.02-0.10% C, 2.0-4.5% Si, 0.02-0.15% Mn, 0.015-0.040% acid soluble Al, and 0.0040-0.0100% N and further containing 0.008-0.080%, in total, of either or both of S and Se, is used. At the time of hot rolling of this silicon steel, the inlet temp. of a finish rolling mill is regulated to 950-1300 deg.C and rolling velocity at the outlet side is controlled to 600

62. 发明专利

JPH07188756A PRODUCTION OF GRAIN-ORIENTED SILICON STEEL SHEET EXCELLENT IN MAGNETIC PROPERTY 失效
公开(公告)号：JPH07188756A
公开(公告)日：1995-07-25
申请号：JP33564193
申请日：1993-12-28
申请人： KAWASAKI STEEL CO
发明人： HAYAKAWA YASUYUKI , YAMAGAMI HIDEO , IWAMOTO KATSUO
IPC分类号： C21D8/12 , C22C38/00 , C22C38/60 , H01F1/147 , H01F1/16
摘要： PURPOSE:To obtain stable magnetic properties by a single-cold-rolling process. CONSTITUTION:A grain-oriented silicon steel sheet is produced by a single-cold- rolling process by using a slab of a silicon steel, having a composition containing, by weight, 0.03-0.12% C, 2.0-4.5% Si, 0.02-0.20% Mn, 0.010-0.065% Al, 0.0050-0.0150% N, and 0.010-0.040% S and/or Se, as a stock. In this manufacturing method, hot rolled plate annealing is done at 1000-1200 deg.C, and then, rolling is performed at >=5% draft at 900-600 deg.C in the course of subsequent cooling and also surface decarburization of 0.005-0.025% is done in the course of the above hot rolled plate annealing. By this method, the state of AlN dispersion and the state of C precipitation can be improved.

63. 发明专利

JPH0754154A PRODUCTION OF GRAIN-ORIENTED SILICON STEEL SHEET HAVING HOMOGENEOUS FORSTERITE FILM 失效
公开(公告)号：JPH0754154A
公开(公告)日：1995-02-28
申请号：JP20170793
申请日：1993-08-13
申请人： KAWASAKI STEEL CO
发明人： SUZUKI TAKASHI , KONO MASAKI , IWAMOTO KATSUO
IPC分类号： C21D9/46 , C23C22/00
摘要： PURPOSE:To produce a grain-oriented silicon steel sheet having a homogeneous forsterite film, at the time of forming an insulated film constituted of forsterite on the surface of a silicon steel sheet, by removing the surface layer by a specified amt. before decarburizing annealing after process annealing. CONSTITUTION:A silicon steel slab is subjected to hot rolling, is subjected to cold rolling for >=two times including process annealing to regulate its cold rolling sheet thickness into a final one, which is subjected to decarburizing annealing to form subscales essentially consisting of SiO2 on the surface of the steel sheet. Moreover, it is coated with a separation agent for annealing essentially consisting of MgO and is next subjected to finish annealing to form an insulated film essentially consisting of forsterite. At that time, before the decarburizing annealing after the process annealing, a surface layer by the weight shown by the inequality A>=(0.65XB-543)XC [A denotes the surface layer (g/m ) to be removed, B denotes the process annealing temp. ( deg.C) and C denotes the sheet thickness (mm) before the removal of the surface layer] is removed. Thus, the grain-oriented silicon steel sheet having a homogeneous forsterite film excellent in adhesion and furthermore little in defects can stably be obtd.

64. 发明专利

JPH06264259A PRODUCTION OF GRAIN-ORIENTED SILICON STEEL SHEET EXCELLENT IN MAGNETIC PROPERTY 失效
公开(公告)号：JPH06264259A
公开(公告)日：1994-09-20
申请号：JP5196093
申请日：1993-03-12
申请人： KAWASAKI STEEL CO
发明人： IWAMOTO KATSUO , OBARA TAKASHI , KONO MASAKI
IPC分类号： C21D8/12 , C21D9/46 , C23C22/78
摘要： PURPOSE:To improve the magnetic properties of a silicon steel sheet, at the time of producing a grain-oriented silicon steel sheet contg. 2.5 to 4.0% Si by coating the surface of a steel sheet before decarburizing annealing and after final cold rolling with a specified amt. of Si compound. CONSTITUTION:At the time of producing a grain-oriented silicon steel sheet by a series of process in which the stock of grain-oriented silicon steel is subjected to hot rolling, thereafter subjected to hot rolled sheet annealing, next subjected to cold rolling for one time or two times including process annealing, is thereafter degreased, subsequently subjected to decarburizing annealing, is coated with a porting agent for annealing, thereafter subjected to finish annealing, is applied with tension coating and is subjected to flattening annealing, the surface of the steel sheet is coated with Si compounds by 0.1 to 5g/m expressed in terms of Si before the decarburizing annealing and after the final cold rolling; where, as the Si-contg. material, SiCl, SiCl4, SiC, Na2SiO3, 9H2O, SiO2, Na2[SiF6] or the like are advantageous, and by the uniform application thereof, the accumulating degree in the Goss orientation of secondarily recrystallized ones can be increased to effectively reduce core loss.

65. 发明专利

JPH06256846A PRODUCTION OF GRAIN ORIENTED ELECTRICAL STEEL SHEET HAVING STABLE HIGH MAGNETIC FLUX DENSITY 失效
公开(公告)号：JPH06256846A
公开(公告)日：1994-09-13
申请号：JP4001193
申请日：1993-03-01
申请人： KAWASAKI STEEL CO
发明人： NAKANO HISASHI , IWAMOTO KATSUO , OBARA TAKASHI
IPC分类号： C21D8/12
摘要： PURPOSE:To stably produce the grain oriented electrical steel sheet having a high magnetic flux density and decreased variations by subjecting a low-carbon steel slab having a specific compsn. to hot rolling and cold rolling, then to decarburization annealing and finish annealing. CONSTITUTION:A continuously cast slab of the low-carbon steel having the compsn. contg., by weight %, 0.02 to 0.10% C, 2.0 to 4.5% Si, 0.02 to 0.15% Mn, 0.015 to 0.04O% Sol. Al, 0.004 to 0.010% N and 0.008 to 0.08% in total of one or two kinds of S and Se is hot-rolled at a high temp. and is coiled as a sheet material coil. This hot rolled coil is adjusted by intermediate annealing to 0.015 to 0.025% content of C in the front layer part of 20% sheet thickness direction from the front surface of the steel sheet and 0.020 to 0.10% content of C in the remaining intermediate layer. After the steel sheet is made into the final sheet thickness of =2 passes of cold rolling including this intermediate annealing, the steel sheet is subjected to decarburization annealing in a wet hydrogen atmosphere and is further subjected to finish annealing by applying a sepn. agent consisting of MgO as an essential component for annealing thereon, by which the grain oriented electrical steel sheet having insulating films on the surfaces and the high magnetic flux density is produced.

66. 发明专利

JPH0610050A PRODUCTION OF GRAIN-ORIENTED SILICON STEEL SHEET EXCELLENT IN MAGNETIC PROPERTY 失效
公开(公告)号：JPH0610050A
公开(公告)日：1994-01-18
申请号：JP16965492
申请日：1992-06-26
申请人： KAWASAKI STEEL CO
发明人： IWAMOTO KATSUO , YAMAGAMI HIDEO , NISHIIKE UJIHIRO , SUGA TAKAHIRO
IPC分类号： C21D8/12 , C22C38/00 , C22C38/60
摘要： PURPOSE:To produce a grain-oriented silicon steel sheet excellent in magnetic properties by subjecting the rolled sheet of a silicon steel containing specific amounts of C, Si, Mn, S, and Se to decarburizing annealing, specific heat treatment, secondary recrystallization treatment, and purification annealing. CONSTITUTION:A slab of a silicon steel having a composition containing, by weight, 0.020-0.080% C, 2.5-4.0% Si, 0.03-0.15% Mn, and 0.008-0.100% S and/or Se is hot-rolled, cold-rolled once or cold-rolled twice while process-annealed between the cold rolling stages, and finished to the final sheet thickness. Then decarburizing annealing is applied to the steel sheet and a separation agent at annealing, composed essentially of MgO, is applied, and secondary recrystallization treatment is carried out at 800-920 deg.C. Subsequently purification annealing is applied to the steel sheet, by which a grain-oriented steel sheet is obtained. At this time, prior to the secondary recrystallization treatment, the steel sheet is held at 650-800 deg.C for 5-20hr in an atmosphere consisting of 25-75% dry H2 and the balance N2. By this method, Goss-oriented secondary- recrystallized grains can be increased in the integration degree and refined, and iron loss value can be remarkably reduced.

67. 发明专利

JPH0270020A PRODUCTION OF GRAIN ORIENTED SILICON STEEL SHEET 失效
公开(公告)号：JPH0270020A
公开(公告)日：1990-03-08
申请号：JP21838288
申请日：1988-09-02
申请人： KAWASAKI STEEL CO
发明人： IWAMOTO KATSUO , IIDA YOSHIAKI , FUKUDA BUNJIRO
IPC分类号： C21D8/12 , C21D9/46 , C22C38/00
摘要： PURPOSE:To produce the grain oriented silicon steel strip uniformly having excellent magnetic characteristics by hot rolling a silicon steel slab having a specific compsn., then subjecting the steel strip to finish rolling at a specific final cold rolling draft then to decarburization annealing, applying an annealing and separating agent thereon and drying the coating, then coiling the steel strip and subjecting the steel strip to final finish annealing. CONSTITUTION:The silicon steel slab having the compsn. contg., by weight %, 0.020 to 0.080% C, 2.5 to 4.0% Si, 0.03 to 0.15% Mn, 0.008 to 0.080% in total of 1 or 2 kinds of S or Se, or further contg. 0.010 to 0.070% Sol Al, and 0.0035 to 0.0140% N is hot rolled to a sheet material and is then subjected to one pass or two passes of cold rolling including intermediate annealing at 40 to 80% final cold rolling draft by which the slab is made into the steel strip having the final sheet thickness at the time of producing the silicon steel strip to be used for the iron cores of transformers. After the steel strip is subjected to decarburization annealing, the annealing and separating agent is applied thereon at >=8g/m in total of both surfaces and at the coated amt. in the inner winding part of the coil larger in average by >=10% than the amt. in the outer winding part. This steel strip is coiled and is subjected to the final annealing. The excellent grain oriented silicon steel sheet having the magnetic characteristics uniform in the longitudinal direction of the steel strip is thus obtd.

68. 发明专利

JPH028327A PRODUCTION OF GRAIN-ORIENTED SILICON STEEL SHEET HAVING GOOD MAGNETIC CHARACTERISTIC 失效
公开(公告)号：JPH028327A
公开(公告)日：1990-01-11
申请号：JP15666788
申请日：1988-06-27
申请人： KAWASAKI STEEL CO
发明人： HAYAKAWA YASUYUKI , KOMATSUBARA MICHIRO , IIDA YOSHIAKI , IWAMOTO KATSUO
IPC分类号： C21D8/12 , C22C38/00 , C22C38/16
摘要： PURPOSE:To produce the title grain-oriented silicon steel sheet having a good magnetic characteristic by rough-rolling a silicon steel slab having limited contents of C, Si, Mn, Cu, Se, and S at a specified temp., then finish rolling, and cold-rolling, etc., the sheet. CONSTITUTION:A silicon-steel slab contg. 0.02-0.07wt.% C and 2.0-4.0wt.% Si is heated, and hot-rolled by a rough-rolling machine and a finish-rolling machine. The hot-rolled sheet is cold-rolled to the final thickness by one cold rolling or two cold rollings including process annealing. The cold-rolled sheet is decarburized, primarily recrystallization-annealed, and finish-annealed at high temp. to obtain a grain-oriented silicon steel sheet with (110) orientation as the main orientation. In this method, 0.02-0.08% Mn, 0.05-0.30% Cu, and 0.012-0.050% Se are further incorporated as the components of the silicon-steel slab, the S content is controlled to

69. 发明专利

JPH01139723A MANUFACTURE OF GRAIN-ORIENTED SILICON STEEL SHEET EXCELLENT IN MAGNETIC PROPERTY 失效
公开(公告)号：JPH01139723A
公开(公告)日：1989-06-01
申请号：JP29784687
申请日：1987-11-27
申请人： KAWASAKI STEEL CO
发明人： KOMATSUBARA MICHIRO , HAYAKAWA YASUYUKI , IIDA YOSHIAKI , IWAMOTO KATSUO
IPC分类号： C22C38/00 , C21D8/12 , C22C38/06 , C22C38/12
摘要： PURPOSE:To improve magnetic flux density and to reduce iron loss by specifying the length of holding time in a high-temp. region in slab heating and annealing conditions just before the final cold rolling at the time of manufacturing a grain-oriented silicon steel sheet having a specific composition. CONSTITUTION:A slab having a composition consisting of, by weight, 0.05-0.085% C, 2.0-4.0% Si, 0.01-0.20% Mn, 0.008-0.100% S and/or Se, 0.010-0.065% solAl, 0.003-0.013% N, 0.001-0.30% Zn, and the balance essentially Fe and containing, if necessary, 0.003-0.030% Mo is heated up to >=1400 deg.C while regulating holding time in a temp. region as high as >=1200 deg.C to

70. 发明专利

JPS63277718A MANUFACTURE OF GRAIN-ORIENTED SILICON STEEL SHEET EXCELLENT IN MAGNETIC CHARACTERISTIC 失效
公开(公告)号：JPS63277718A
公开(公告)日：1988-11-15
申请号：JP11241087
申请日：1987-05-11
申请人： KAWASAKI STEEL CO
发明人： KOBAYASHI YOSHINORI , KUROSAWA MITSUMASA , IIDA YOSHIAKI , SAKAGUCHI MASAYUKI , IWAMOTO KATSUO
IPC分类号： C21D8/12
摘要： PURPOSE:To manufacture a grain-oriented silicon steel sheet excellent in magnetic flux density, by hot-rolling and cold-rolling a silicon-steel slab to form a steel sheet, subjecting this steel sheet to primary recrystallization annealing which doubles as decarburization under specific conditions, and successively applying secondary recrystallization annealing. CONSTITUTION:A silicon-steel slab is hot-rolled and the hot-rolled steel plate is annealed and subjected to removal of surface scales, which is cold-rolled twice, while process-annealed between the cold-rolling stages, so as to be finished into a steel sheet of 0.23mm final thickness. A coil of this steel sheet is subjected to primary recrystallization annealing which doubles as decarburization by dividing both coil ends into a region where temp. is raised at >=10 deg.C/sec temp.-rise rate and a region where temp. is raised at =10 deg.C local difference in temp. is provided to the subsequent secondary recrystallization annealing initiation, and, under a temp. gradient larger than the above-mentioned difference, secondary recrystallization annealing is carried out from a region having high initial temp. of secondary recrystallization.

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