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1. 发明专利

JPH08232020A PRODUCTION OF GRAIN ORIENTED SILICON STEEL SHEET 失效
公开(公告)号：JPH08232020A
公开(公告)日：1996-09-10
申请号：JP3810195
申请日：1995-02-27
申请人： NIPPON STEEL CORP
发明人： HARASE JIRO , FUJII NOBUNORI , KUROSAWA FUMIO
IPC分类号： C21D8/12 , C21D9/46 , C22C38/00 , C22C38/60 , H01F1/16
摘要： PURPOSE: To inexpensively produce a silicon steel sheet excellent in magnetic properties by subjecting a steel of specific composition to cold rolling at specific rolling rate and to annealing, regulating the total nitrogen content to specific ppm, applying a separation agent at annealing to the resulting sheet, and then finish-annealing it. CONSTITUTION: A steel, having a composition consisting of, by weight ratio, 0.001-0.09% C, 2-4.5% Si, 0.01-0.08% acid soluble Al, 0.0001-0.004% N, 0.008-0.06%, independently or in total, of S and/or Se, 0.01-1% Cu, 0.01-0.5% Mn, small amounts of one or more elements among Bi, P, Sn, Sb, Pb, B, V, Nb, and Zr, and the balance Fe with inevitable impurities, is used. A cold rolled sheet of silicon steel, prepared by cold-rolling the steel at 75-95% cold rolling rate before primary recrystallization annealing, is annealed at 800-1000 deg.C for 1-300sec, and then the total nitrogen content is regulated to 50-1000ppm. After the application of a separation agent at annealing, finish-annealing is done. By this method, magnetic flux density can be increased.

2. 发明专利

JPH0797630A PRODUCTION OF HIGH MAGNETIC FLUX DENSITY GRAIN ORIENTED SILICON STEEL SHEET 失效
公开(公告)号：JPH0797630A
公开(公告)日：1995-04-11
申请号：JP22914293
申请日：1993-09-14
申请人： NIPPON STEEL CORP
发明人： HARASE JIRO , TAKASHIMA KUNIHIDE , NAGASHIMA TAKEO
IPC分类号： C21D8/12 , C22C38/00 , C22C38/16 , H01F1/16
摘要： PURPOSE:To stably produce a grain oriented silicon steel sheet having high magnetic flux density and remarkably small in core loss. CONSTITUTION:The compsn. of a steel is constituted of the one contg. 0.01 to 0.08% Al, 2.0 to 4.5% Si, 0.05 to 2.0% Cu, 0.0005 to 0.05% Bi and 0.001 to 0.06% S, and the balance Fe with inevitable impurities, and the hot rolled steel strip thereof is annealed according to necessary and is thereafter subjected to cold rolling for one time or >=two times including process annealing to regulate its thickness to a prescribed one, which is subjected to primary recrystallization annealing, is thereafter subjected to nitriding annealing according to necessary, is thereafter coated with a separation agent for annealing and is subjected to finish annealing. After the nitriding annealing, a separation agent for annealing essentially consisting of one or >=two kinds among alumina, silica, zirconia, strontium oxide and forsterite is applied.

3. 发明专利

JPH0770640A PRODUCTION OF GRAIN-ORIENTED SILICON STEEL SHEET 失效
公开(公告)号：JPH0770640A
公开(公告)日：1995-03-14
申请号：JP21660193
申请日：1993-08-31
申请人： NIPPON STEEL CORP
发明人： HARASE JIRO
IPC分类号： C21D8/12 , C22C38/00 , C22C38/06 , C23C8/26 , H01F1/16
摘要： PURPOSE:To produce a grain-oriented silicon steel excellent in magnetic properties by subjecting a dead soft high silicon steel slab to hot rolling, annealing and cold rolling under specified temp. conditions and thereafter executing primary recrystallization annealing, nitriding treatment and final finish annealing. CONSTITUTION:The steel slab contg. by weight, 0.005 to 0.015% C, 2.0 to 4.5% Si, 0.010 to 0.080% acid soluble Al, 0.001 to 0.020% N, 0.020 to 0.060% S, 0.001 to 0.1% Sn, and the balance Fe is subjected to rough rolling at 1000 to 1200 deg.C, and finish hot rolling is executed to obtain a hot rolled sheet, which is, as necessary, subjected to short time annealing at 700 to 1100 deg.C and is thereafter water-cooled. Next, it is subjected to cold rolling into a cold rolled sheet having prescribed thickness. In the process of the same, it is held to 100 to 300 deg.C for 1min to 1hr for at least one time, is thereafter heated in the temp. range of 800 to 1000 deg.C for 1 to 200sec and is subjected to decarburizing annealing. This cold rolled sheet is subjected to nitriding treatment in a mixed atmosphere of NH3+H2 to regulate the N content into 150 to 1500ppm, is finally coated with an MgO series separation agent for annealing and is subjected to secondary recrystallization finish annealing at >=800 deg.C.

4. 发明专利

JPH0770639A PRODUCTION OF GRAIN-ORIENTED SILICON STEEL SHEET 失效
公开(公告)号：JPH0770639A
公开(公告)日：1995-03-14
申请号：JP21660093
申请日：1993-08-31
申请人： NIPPON STEEL CORP
发明人： HARASE JIRO
IPC分类号： C21D8/12 , C22C38/00 , C22C38/06 , H01F1/16
摘要： PURPOSE:To produce a grain-oriented silicon steel sheet excellent in magnetic properties by subjecting a dead soft high silicon steel slab to hot rolling and annealing, thereafter subjecting it to cold rolling to regulate its sheet thickness into a final one and successively executing primary recrystallization annealing, nitriding treatment and final finish annealing. CONSTITUTION:The dead soft high silicon steel slab having a compsn. contg., by weight, 0.0005 to 0.004% C, 2.0 to 4.5% Si, 0.010 to 0.080% acid soluble Al, 0.001 to 0.020% N, 0.0020 to 0.060% S and 0.01 to 0.1% Sn, and the balance Fe is subjected to rough rolling at 1000 to 1200 deg.C, then is annealed in the temp. range of 780 to 1100 deg.C for about 2min after the completion of finish hot rolling. Next, the hot rolled sheet is subjected to pickling treatment, and is thereafter subjected to cold rolling to regulate its sheet thickness into a final thickness of about 0.30mm, which is heated at 800 to 1200 deg.C for 1 to 200sec, is subjected to primary recrystallization annealing and is subsequently subjected to nitriding treatment in a gaseous mixture of NH3+H2 to regulate the N2 content into 150 to 1500ppm. Finally, it is coated with a separation agent for annealing of MgO series and is subjected to finish annealing at >=800 deg.C as secondary recrystallization annealing.

5. 发明专利

JPH0726328A PRODUCTION OF GRAIN ORIENTED SILICON STEEL SHEET 失效
公开(公告)号：JPH0726328A
公开(公告)日：1995-01-27
申请号：JP15498493
申请日：1993-06-25
申请人： NIPPON STEEL CORP
发明人： HARASE JIRO
IPC分类号： C21D8/12 , C22C38/00 , C22C38/16 , H01F1/16
摘要： PURPOSE:To stably produce a grain oriented silicon steel sheet having high magnetic flux density by specifying chemical components and further limiting the stages of rolling and heat treatment. CONSTITUTION:A slab of silicon steel, having a composition consisting of, by weight, 0.0005-0.004% C, 2.0-4.5% Si, 0.010-0.080% acid soluble Al, 0.001-0.20% N, 0.050-2.00% Cu, 0.005-0.060% S, 0.010-0.100% Sb, and the balance essentially Fe, is formed into a hot rolled steel strip. After short time annealing at 700-1100 deg.C if necessary, the steel strip is cold-rolled once or cold-rolled twice or more while process-annealed between the cold rolling stages to prescribed sheet thickness. The resulting sheet is subjected to heating and nitriding treatment at 850-1050 deg.C for 1-200sec. After a separation agent at annealing is applied, finish annealing is done. By this method, the grain oriented silicon steel sheet excellent in magnetic properties can be stably produced.

6. 发明专利

JPH021211B2 失效
公开(公告)号：JPH021211B2
公开(公告)日：1990-01-10
申请号：JP13275884
申请日：1984-06-27
申请人： NIPPON STEEL CORP
发明人： HARASE JIRO , TAKESHITA TETSUO , OOTA KUNITERU
IPC分类号： B21B3/02 , B21B1/28 , C21D8/02 , C21D8/04 , C21D9/46

7. 发明专利

JPH01210103A METHOD FOR COLD ROLLING OF STAINLESS STEEL SHEET 失效
公开(公告)号：JPH01210103A
公开(公告)日：1989-08-23
申请号：JP3389688
申请日：1988-02-18
申请人： NIPPON STEEL CORP
发明人： YAMAMOTO HIROYASU , UEDA MASANORI , HARASE JIRO
IPC分类号： B21B1/22 , B21B3/00 , B21B3/02
摘要： PURPOSE:To enable rolling an austenitic stainless steel sheet by a large draft and to reduce a ridging value for ferritic stainless steel sheet by heating a sheet in the inlet side at a specific temp. and rolling the sheet. CONSTITUTION:As for an austenitic stainless steel sheet, generation of martensite caused by rolling is prevented and deformation resistance is markedly reduced by heating the sheet at a temp. of 100-450 deg.C. Therefore, a draft per pass is increasable and the productivity is improved by reduction of the number of passes. As for a ferritic stainless steel sheet, a ridging value sharply drops as a temp. rises when a sheet is heated to 100-450 deg.C, so that a neat stainless steel product having no ridging is obtained when deep drawing is performed.

8. 发明专利

JPS6326177B2 失效
公开(公告)号：JPS6326177B2
公开(公告)日：1988-05-28
申请号：JP14644380
申请日：1980-10-20
申请人： NIPPON STEEL CORP
发明人： HARASE JIRO
IPC分类号： B21B3/02 , C21D8/02 , C21D9/30 , C21D9/46

9. 发明专利

JPS6320889B2 失效
公开(公告)号：JPS6320889B2
公开(公告)日：1988-05-02
申请号：JP15413280
申请日：1980-11-01
申请人： NIPPON STEEL CORP
发明人： HARASE JIRO
IPC分类号： C22C38/00 , C21D8/04 , C21D9/46 , C21D9/48 , C22C38/38

10. 发明专利

JPS6256529A MANUFACTURE OF FERRITIC STAINLESS STEEL SHEET HAVING SATISFACTORY RIDGING CHARACTERISTIC 失效
公开(公告)号：JPS6256529A
公开(公告)日：1987-03-12
申请号：JP19608885
申请日：1985-09-06
申请人： NIPPON STEEL CORP
发明人： TAKESHITA TETSUO , HARASE JIRO
IPC分类号： C21D9/46 , C21D8/02
摘要： PURPOSE:To manufacture a ferritic stainless steel sheet having improved ridging characteristics in spite of the addition of Al by heating a ferritic stainless steel slab to a specified temp., hot rolling it and rapidly cooling the resulting steel sheet under specified conditions. CONSTITUTION:A ferritic stainless steel slab contg. 0.10-0.30wt% Al is heated to >=1.150 deg.C and hot rolled. The resulting steel sheet is rapidly cooled at >=30 deg.C/sec cooling rate in the temp. range of 850-700 deg.C and subjected to final annealing. By this method, the ridging characteristics of the ferritic stainless steel sheet contg. Al can be improved without carrying out annealing after hot rolling or deteriorating outer physical properties.

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