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1. 发明专利

JP2001303193A RESISTANCE WELDED STEEL TUBE FOR STRUCTURAL USE, EXCELLENT IN HYDROFORMABILITY AND HAVING PRECIPITATION STRENGTHENING PROPERTY, ITS MANUFACTURING METHOD, AND METHOD FOR MANUFACTURING HYDROFORMED MEMBER 失效
公开(公告)号：JP2001303193A
公开(公告)日：2001-10-31
申请号：JP2000127074
申请日：2000-04-27
申请人： KAWASAKI STEEL CO
发明人： TOSAKA AKIO , KAMI TSUTOMU , HASHIMOTO YUJI
IPC分类号： B21D26/033 , B21D26/041 , B21D26/043 , B21D26/053 , C21D7/02 , C21D8/10 , C21D9/08 , C22C38/00 , C22C38/16 , C22C38/54 , C22C38/58 , B21D26/02
摘要： PROBLEM TO BE SOLVED: To provide a technique for manufacturing a resistance welded steel tube for structural use, suitably used for automobile structural member, under carriage member, or the like, and particularly excellent in workability at hydroforming (hydroformability) and having precipitation strengthening property, and a member using this steel tube. SOLUTION: A hot rolled or cold rolled hoop stock, which has a composition consisting of 0.01- =80%) and the balance Fe with inevitable impurities and containing, if necessary, at least one kind selected from 0.05-1.50% Ni (under the condition that the atomic ratio between Ni and Cu, Ni/Cu, is >=0.5), 0.005-0.040% Nb, 0.005-0.50% Ti, 0.0005-0.020% B, 0.02-1.0% Cr, 0.02-1.0% Mo, 0.0020-0.02% Ca and 0.0020-0.02% REM, is formed into cylindrical shape and the resultant seam is subjected to electric resistance welding, followed by sizing at 0.3-10% drawing rate of outer peripheral length.

2. 发明专利

JP2001107187A HIGH STRENGTH STEEL SHEET FOR CAN AND ITS PRODUCING METHOD 失效
公开(公告)号：JP2001107187A
公开(公告)日：2001-04-17
申请号：JP2000057085
申请日：2000-03-02
申请人： KAWASAKI STEEL CO
发明人： TOSAKA AKIO , KAMI TSUTOMU , SHONO YASUYUKI , FURUKIMI OSAMU
IPC分类号： C21D9/48 , C22C38/00 , C22C38/06 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To produce a high strength extra-thin cold rolled steel sheet with a sheet thickness of =50 MPa, and yield stress after coating/baking treatment is >=550 MPa and to provide a method for producing the same. SOLUTION: A hot rolled steel sheet having a composition containing, by mass, =80% of the N content is cold-rolled, is thereafter, in a continuous annealing stage, soaked in the temperature range of 500 deg.C to the one at which the recrystallization ratio reaches =150 deg.C/s to the temperature region of

3. 发明专利

JP2000017335A PRODUCTION OF GRAIN ORIENTED SILICON STEEL SHEET FREE FROM EDGE CRACK 失效
公开(公告)号：JP2000017335A
公开(公告)日：2000-01-18
申请号：JP19137998
申请日：1998-07-07
申请人： KAWASAKI STEEL CO
发明人： TOGE TETSUO , KAMI TSUTOMU , NAKANISHI TADASHI
IPC分类号： B22D11/00 , B22D27/02 , C21D8/12 , C22C38/00 , C22C38/60 , H01F1/16
摘要： PROBLEM TO BE SOLVED: To stably obtain a steel sheet free from edge crack and good in magnetic properties by controlling the contents of acid soluble Al, N, Se and S in steel contg. specified ratio of C, Si and Mn, the size of the grains in the slab columnar crystal parts after casting and the heating temp. SOLUTION: Steel contg., by weight, 0.005 to 0.08% C, 1.0 to 7.0% Si and 0.03 to 2.5% Mn is melted to cast to form into a silicon steel slab, which is successively subjected to heating, hot rolling and hot rolled sheet annealing and is thereafter subjected to cold rolling to control its sheet thickness into the final one, and, finish annealing is executed to produce a grain oriented silicon steel sheet. At this time, the contents of acid soluble Al, N, Se and S in the steel are controlled to the ranges of, by weight, 0.001 to 0.030% acid soluble Al, 0.003 to 0.010% N and

4. 发明专利

JPH11264018A PRODUCTION OF GRAIN ORIENTED MAGNETIC STEEL SHEET 失效
公开(公告)号：JPH11264018A
公开(公告)日：1999-09-28
申请号：JP6632898
申请日：1998-03-17
申请人： KAWASAKI STEEL CO
发明人： TOGE TETSUO , KAMI TSUTOMU , HONDA ATSUTO
IPC分类号： H01F1/16 , C21D8/12 , C21D9/46 , C22C38/00 , C22C38/60
摘要： PROBLEM TO BE SOLVED: To obtain a stable magnetic characteristic in the whole length of a coil without positively applying nitriding on the way of process by controlling annealing speed of a decarburize-annealing by dividing the temperature into two specific temp. ranges to a silicon steel slab containing C, Si, Mn, soluble Al, N, and Se and S in the range satisfying a specific relation of Se and S. SOLUTION: The silicon steel slab contains, by wt.%, 0.005-0.08% C, 2.0-4.5% Si, 0.03-2.5% Mn, 0.005-0.030% soluble Al and 0.003-0.010% N, and Se and S in the range satisfying Se+2.47S

5. 发明专利

JPH11181525A PRODUCTION OF GRAIN ORIENTED SILICON STEEL SHEET EXCELLENT IN MAGNETIC PROPERTY AND FILM CHARACTERISTIC 失效
公开(公告)号：JPH11181525A
公开(公告)日：1999-07-06
申请号：JP35448897
申请日：1997-12-24
申请人： KAWASAKI STEEL CO
发明人： KOMATSUBARA MICHIRO , WATANABE MAKOTO , KAMI TSUTOMU
IPC分类号： C23C22/00 , C21D8/12 , C21D9/46 , H01F1/147 , H01F1/16
摘要： PROBLEM TO BE SOLVED: To produce a grain oriented silicon steel sheet capable of giving excellent film characteristic and magnetic properties even in the case of a large sized silicon steel sheet coil and even in the case where MgO roasted in a rotary kiln is used as an essential component of a separation agent at annealing. SOLUTION: As MgO for a separation agent at annealing, MgO, prepared by roasting an Mg-element-containing raw material which forms MgO by roasting, hydrating the resultant MgO to form Mg(OH)2 having (4.0 to 15.0) m /g specific surface area, 25-150 nm (c)-axis average diameter of crystallite, and 50 to 1,200 nm (a)-axis average diameter, and then roasting this Mg(OH)2 again in a rotary kiln, is used. This MgO has 40-100 sec 40%CAA value, 120-400 sec 80%CAA value, (12 to 35) m /g specific surface area, and 0.7-2.8 wt.% 1 g. loss.

6. 发明专利

JPH11124632A PRODUCTION OF GRAIN ORIENTED SILICON STEEL SHEET EXCELLENT IN MAGNETIC PROPERTY AND COATING CHARACTERISTIC 失效
公开(公告)号：JPH11124632A
公开(公告)日：1999-05-11
申请号：JP28954897
申请日：1997-10-22
申请人： KAWASAKI STEEL CO
发明人： WATANABE MAKOTO , KAMI TSUTOMU , HONDA ATSUTO
IPC分类号： C21D8/12 , C21D9/46 , H01F1/16
摘要： PROBLEM TO BE SOLVED: To stably improve the magnetic properties and coating characteristics by regulating the thickness of a silica-enriched layer contg. lamellar SiO2 in an oxidizing layer formed by primary recrystallization annealing, the content of S in the whole body of a separation agent for annealing and their product respectively to specified ranges. SOLUTION: A steel stock contg., by weight, 2 to 4.5% Si is subjected to hot rolling and cold rolling to regulate its sheet thickness into a final one, which is thereafter subjected to primary recrystallization annealing. At this time, the atmosphere, temp. and time are controlled, and the thickness (w) (μm) of the lamellar SiO2 layer in an internal oxidizing layer is regulated to 0.2 to 3.6. After the annealing, a separation agent for annealing essentially consisting of MgO is used. At this time, the value (s) (%) expressed with the content of S in the whole body of a separation agent for annealing including an addition agent and MgO impurities as SO3 is regulated to 0.1 to 2.8. Moreover, the product of the (w) and (s) is allowed to satisfy the rage of 0.15

7. 发明专利

JPH10152780A INSULATING FILM FOR GRAIN ORIENTED SILICON STEEL SHEET, AND ITS FORMATION 失效
公开(公告)号：JPH10152780A
公开(公告)日：1998-06-09
申请号：JP31038496
申请日：1996-11-21
申请人： KAWASAKI STEEL CO
发明人： WATANABE MAKOTO , KAMI TSUTOMU , SATO KEIJI
IPC分类号： C23C22/00 , C21D9/46
摘要： PROBLEM TO BE SOLVED: To obtain a superior film without deteriorating magnetic properties by partially infiltrating a film into the inner part of ferrite to form anchor parts and regulating the area ratio of the remaining parts of the film, at the time when the film is peeled off at the bending test of a steel sheet, to a value in a specific range. SOLUTION: This film 1 partially infiltrates into the inner part of ferrite 2 and forms anchor parts 3, and the area ratio of remaining parts 4 of the above film is 8-53%. A steel, containing 2-4wt.% Si, is hot-rolled and cold-rolled and finished to final sheet thickness and then subjected to primary recrystallization annealing, and, after the application of an MgO-type separation agent at annealing, final finish annealing is performed, by which an insulating film is formed on the surface of ferrite of the steel sheet. At this time, the thickness of a lamellar silica-enriched layer in the internally oxidized layer formed at primary recrystallization annealing is regulated to 0.2-3.6μm, and an MgO in which the amount of moisture introduced as the result of being formed into slurry state becomes 1.0-3.9% is used as a separation agent at annealing, and further, atmospheric oxidizing property P(H2 O)/P(H2 ) at 700- to 2.0×10 .

8. 发明专利

JPH1088244A MAGNESIUM OXIDE FOR SEPARATION AGENT AT ANNEALING USED FIXED AT MANUFACTURE OF GRAIN ORIENTED SILICON STEEL SHEET 失效
公开(公告)号：JPH1088244A
公开(公告)日：1998-04-07
申请号：JP24160896
申请日：1996-09-12
申请人： KAWASAKI STEEL CO
发明人： KOMATSUBARA MICHIRO , MORITO NOBUYUKI , KAMI TSUTOMU , WATANABE MAKOTO
IPC分类号： C23C22/00 , C21D1/70 , C21D9/46
摘要： PROBLEM TO BE SOLVED: To obtain MgO for a separation agent at annealing, excellent in magnetic properties and film characteristic, by carrying out mixing, at the time of mixing plural MgO powders for a separation agent at annealing, accord ing to the amount of deviation from the desired value of reaction time at the prescribed ratio of reaction with acid. SOLUTION: Two or more kinds of MgO powders, obtained by burning magnesium hydroxide in a rotary kiln, are mixed to prepare an MgO powder for a separation agent at annealing for a grain oriented silicon steel sheet. At this time, mixing of these burnt MgO powders is carried out while regulating their mixing proportions according to the amount of deviation from the desired value of reaction time at the prescribed ratio of reaction with acid (citric acid), as activity or activity distribution, and the amount of deviation from the desired value of reaction time is regulated to a value in the range within ±20% of respective desired values. By using the resultant MgO powder for a separation agent at annealing, a grain oriented silicon steel sheet, having extremely excellent magnetic properties arid excellent film characteristic, can be produced.

9. 发明专利

JPH1088240A METHOD FOR EVALUATION OF MAGNESIUM OXIDE FOR SEPARATION AGENT AT ANNEALING AT MANUFACTURE OF GRAIN ORIENTED SILICON STEEL SHEET, AND MANUFACTURE OF GRAIN ORIENTED SILICON STEEL SHEET EXCELLENT IN FILM CHARACTERISTIC 失效
公开(公告)号：JPH1088240A
公开(公告)日：1998-04-07
申请号：JP24045196
申请日：1996-09-11
申请人： KAWASAKI STEEL CO
发明人： WATANABE MAKOTO , KAMI TSUTOMU , KOMATSUBARA MICHIRO , HONDA ATSUTO
IPC分类号： C23C22/00 , C21D1/70 , C21D9/46 , H01F1/147 , H01F1/16
摘要： PROBLEM TO BE SOLVED: To stable obtain a grain oriented silicon steel sheet excellent in mag netic properties as well as film characteristic by measuring gas adsorption isothermal line prior to the use of MgO for a separation agent at annealing and judging the feasibility of application. SOLUTION: A hot rolled silicon steel plate is cold-rolled while process- annealed between cold rolling stages and finished to final sheet thickness. Subsequently, after primary recrystallization annealing, a separation agent at annealing, prepared by using MgO as a main material agent and formed into slurry state, is applied to the surface of the resultant steel sheet and final finish annealing is performed. In this method, an MgO, having a powder characteristic where the N2 gas adsorption isothermal line up to 0.05-0.95 relative pressure satisfied the region enclosed with lines connecting point A (0.05, 2.7), point B (0.3, 4.0), point C (0.8, 7.7), point D (0.95, 13.6), point E (0.95, 40.9), point F (0.8, 15.9), point G (0.3, 7.1), and point H (0.05, 4.6) in the coordinates [relative pressure, amount of adsorption: (ml/g)], is used as MgO.

10. 发明专利

JPH08143970A PRODUCTION OF GRAIN-ORIENTED SILICON STEEL SHEET 失效
公开(公告)号：JPH08143970A
公开(公告)日：1996-06-04
申请号：JP28956194
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 , C22C38/60
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 specifying the oxidation degree of the atmosphere in the former stage of soaking, the atmosphere in the temp. rise stage up to this soaking stage, and the atmosphere in the latter stage of soaking, respectively, at the time of decarburizing annealing. CONSTITUTION: A grain-oriented silicon steel stock is hot-rolled and then cold-rolled once or cold-rolled twice while process-annealed between the cold rolling stages. After decarburizing annealing, a separation agent at annealing is applied to the resulting sheet and final finish annealing is done, by which the grain-oriented silicon steel sheet is produced. In this method, at the time of decarburizing annealing, the oxidation degree, P(H2 O)/P(H2 ), of the atmosphere in the former stage of soaking is regulated to

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