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31. 发明专利

JPS6286124A MANUFACTURE OF GRAIN-ORIENTED ELECTRICAL STEEL SHEET HAVING SMALL IRON LOSS 失效
公开(公告)号：JPS6286124A
公开(公告)日：1987-04-20
申请号：JP22567185
申请日：1985-10-09
申请人： KAWASAKI STEEL CO
发明人： SUGIYAMA MOTOTOMO , IIDA YOSHIAKI , FUKUDA BUNJIRO , NISHIIKE UJIHIRO
IPC分类号： C21D8/12
摘要： PURPOSE:To obtain a grain-oriented electrical steel sheet with a small iron loss by coiling a grain-oriented silicon steel sheet having a region where a forsterite film is not present so that the region is concaved. CONSTITUTION:A hot rolled silicon steel sheet contg.

32. 发明专利

JPS6286123A MANUFACTURE OF GRAIN ORIENTED ELECTRICAL STEEL SHEET HAVING LOW IRON LOSS 失效
公开(公告)号：JPS6286123A
公开(公告)日：1987-04-20
申请号：JP22567085
申请日：1985-10-09
申请人： KAWASAKI STEEL CO
发明人： SUGIYAMA MOTOTOMO , IIDA YOSHIAKI , FUKUDA BUNJIRO , NISHIIKE UJIHIRO
IPC分类号： C21D8/12 , C21D9/46 , C23C22/00
摘要： PURPOSE:To prevent the exfoliation of a film in a dropped out part and to obtain a grain oriented electrical steel sheet having a low iron loss by oxidizing the base iron surface in the film dropped out region of the grain oriented silicon steel sheet having the dropped-out region of a forsterite film. CONSTITUTION:The hot rolled silicon steel sheet contg. =2 passes of cold rolling including intermediate annealing to a final product sheet thickness. The steel sheet is then subjected to decarburization annealing and after a separating agent for annealing essentially consisting of MgO is coated thereon and dried, the steel sheet is coiled and is subjected to final finish annealing, then to tensioni applying type coating. The dropped-out region of the forsterite film is made to exist on the surface of the steel sheet after the final finish annealing in the above-mentioned process for producing the grain oriented electrical steel sheet. The exposed base iron part in the dropped-out region of the forsterite film is oxidized prior to the execution of the tension applying type coating.

33. 发明专利

JPH0615696B2 失效
公开(公告)号：JPH0615696B2
公开(公告)日：1994-03-02
申请号：JP22567085
申请日：1985-10-09
申请人： KAWASAKI STEEL CO
发明人： SUGYAMA MOTOTOMO , IIDA YOSHIAKI , FUKUDA BUNJIRO , NISHIIKE UJIHIRO
IPC分类号： C21D8/12 , C21D9/46 , C23C22/00

34. 发明专利

JPH0558561B2 失效
公开(公告)号：JPH0558561B2
公开(公告)日：1993-08-26
申请号：JP18538885
申请日：1985-08-23
申请人： KAWASAKI STEEL CO
发明人： HONDA ATSUTO , SATO KEIJI , FUKUDA BUNJIRO
IPC分类号： H01F1/16

35. 发明专利

JPH05186832A PRODUCTION OF GRAIN-ORIENTED SILICON STEEL SHEET REDUCED IN IRON LOSS 失效
公开(公告)号：JPH05186832A
公开(公告)日：1993-07-27
申请号：JP19133492
申请日：1992-06-26
申请人： KAWASAKI STEEL CO
发明人： HAYAKAWA YASUYUKI , TAKEUCHI FUMIHIKO , KOMATSUBARA MICHIRO , YAMADA MASATAKA , IIDA YOSHIAKI , NISHIIKE UJIHIRO , FUKUDA BUNJIRO
IPC分类号： C21D8/12 , C22C38/00 , C22C38/60 , H01F1/16
摘要： PURPOSE:To reduce the iron loss of a grain-oriented silicon steel sheet by an industrially advantageous method. CONSTITUTION:A slab of a silicon steel which has a composition containing, by weight, 2.0-4.0% Si and further containing either or both of S and Se as inhibitor forming components is hot-rolled, cold-rolled once or cold-rolled twice or more while process-annealed between the cold rolling stages so as to be formed to the final sheet thickness, and subjected to decarbur-annealing, and then, the resulting sheet is subjected, after the application of a separation agent at annealing composed essentially of MgO to the surface of the steel sheet, to secondary recrystallization annealing and to purification annealing. At the time of producing a grain-oriented silicon steel sheet by a series of stages mentioned above, cold rolling is performed while allowing an oxide layer to be present on the surface of the steel sheet.

36. 发明专利

JPH05186827A PRODUCTION OF GRAIN-ORIENTED SILICON STEEL SHEET EXCELLENT IN MAGNETIC PROPERTY 失效
公开(公告)号：JPH05186827A
公开(公告)日：1993-07-27
申请号：JP289192
申请日：1992-01-10
申请人： KAWASAKI STEEL CO
发明人： NAKANO HISASHI , SATO KEIJI , FUKUDA BUNJIRO
IPC分类号： C21D8/12 , C21D9/46 , C23C18/18 , C23C18/32 , C23F1/02 , C25D7/00
摘要： PURPOSE:To produce a grain-oriented silicon steel sheet advantageously suited for iron core material for transformer and other electrical equipment in particular, free from the dissipation of iron loss reducing effect even after stress relief annealing, and excellent in magnetic properties. CONSTITUTION:A grain-oriented silicon steel stock is hot-rolled and then cold- rolled once or cold-rolled twice or more while process-annealed between the cold rolling stages so as to be formed to the final product sheet thickness, followed by decarburiz-annealing and finish annealing. In the grain-oriented silicon steel sheet producing method consisting of a series of stages mentioned above, etching treatment is applied to the steel sheet after final cold rolling to form linear grooves extending in the direction practically orthogonal to the rolling direction of the steel sheet, and then, these linear grooves are filled with one kind selected from the group consisting of Fe, Ni, Co, and alloys thereof.

37. 发明专利

JPH0551641A PRODUCTION OF LOW CORE LOSS GRAIN-ORIENTED SILICON STEEL SHEET 失效
公开(公告)号：JPH0551641A
公开(公告)日：1993-03-02
申请号：JP23105391
申请日：1991-08-20
申请人： KAWASAKI STEEL CO
发明人： HAYAKAWA YASUYUKI , NISHIIKE UJIHIRO , FUKUDA BUNJIRO
IPC分类号： C21D7/02 , C21D8/12 , C22C38/00 , C22C38/60
摘要： PURPOSE:To manufacture a grain-oriented silicon steel sheet extremely low in core loss on an industrial scale by subjecting a silicon steel slab contg. specified amounts of Si and S or Se to hot rolling and thereafter executing cold rolling with the specified coefficient of friction. CONSTITUTION:A silicon steel slab contg., by weight, 2.0 to 4.0% Si and furthermore contg. independently or total about 0.010 to 0.040% inhibitor forming components of S and Se is subjected to hot rolling. After that, this hot rolled sheet is subjected to cold rolling for one time or >=two times including process annealing to be a final sheet thickness. Next, this cold rolled sheet is subjected to decarburization annealing, and after that, its surface is coated with an annealing releasing agent for annealing essentially consisting of Mgo, and secondary crystallization annealing and purification annealing are executed to obtain a grain-oriented silicon steel sheet. At this time, the above cold rolling is executed in such a manner that the lubrication and draft therein are controlled, the coefficient of friction is regulated to 0.06 to 0.15, if required, it is executed in the temp. range of 100 to 150 deg.C, and the cooling rate in the temp. range of 50 to 100 deg.C in the annealing is prteferably regulated to >=20 deg.C/S. In this way, the low core loss silicon steel sheet can be obtd.

38. 发明专利

JPH0434614B2 失效
公开(公告)号：JPH0434614B2
公开(公告)日：1992-06-08
申请号：JP10613385
申请日：1985-05-20
申请人： KAWASAKI STEEL CO
发明人： SATO KEIJI , FUKUDA BUNJIRO
IPC分类号： H01F1/16 , C21D8/12

39. 发明专利

JPH0456781A SEPARATING AGENT FOR ANNEALING FOR GRAIN-ORIENTED SILICON STEEL SHEET 失效
公开(公告)号：JPH0456781A
公开(公告)日：1992-02-24
申请号：JP16678490
申请日：1990-06-27
申请人： KAWASAKI STEEL CO
发明人： YAMAGUCHI KATSURO , FUKUDA BUNJIRO , SADAYORI KATSUO
IPC分类号： C23C22/00 , C21D9/46
摘要： PURPOSE:To enhance the performance of a grain-oriented silicon steel sheet by using a separating agent based on magnesia obtd. by burning a mixture of magnesium hydroxide with a specified wt.% of Cu basing on the amt. of MgO after burning. CONSTITUTION:A magnesia-based separating agent for annealing is used to form a forsterite coating film on a grain-oriented silicon steel sheet during final annealing at a high temp. At this time, the magnesia is obtd. by adding Cu or a Cu compd. to magnesium hydroxide by 0.1-10 wt.% (expressed in terms of Cu) basing on the amt. of MgO after burning, mixing them and burning the mixture. The properties of the forsterite coating film can be improved.

40. 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.

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