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1. 发明专利

JP2002294404A HIGH CARBON HOT ROLLING STEEL MATERIAL SUITABLE FOR FRICTION PRESSURE WELDING AND PRODUCTION METHOD THEREFOR 失效
公开(公告)号：JP2002294404A
公开(公告)日：2002-10-09
申请号：JP2001094705
申请日：2001-03-29
申请人： KAWASAKI STEEL CO
发明人： KANEMOTO NORIO
IPC分类号： B21B3/00 , C21D8/02 , C22C38/00 , C22C38/26
摘要： PROBLEM TO BE SOLVED: To provide a high carbon steel material suited for friction pressure welding with less increase in hardness at friction pressure welded joints, and provide its production method. SOLUTION: A steel slab containing, by mass, 0.2-0.9% C, C 0.5% or less Si, 1.5% or less Mn, 2.0% or less Cr and 0.03-0.30% Nb, and according to needs, further containing 1.0% or less Mo is hot rolled with the temperature at the end of its finish rolling controlled between [Ar3 transformation point -10 deg.C] and [Ar3 transformation point +30 deg.C], and is cooled immediately after the end of rolling, followed by winding at the temperature of 500 deg.C or less. Such a production method makes it possible to maintain 0.005% or more Nb in the material in a solid solution state, to achieve 9 or more in the austenite grain-size number measured after heat treating at 800 deg.C for 5 minutes under the oxidation process based on the specification of the JIS G 0551, and to enable the control of increase in hardness at the joint areas when friction pressure welding is performed.

2. 发明专利

JPH09155450A METHOD AND EQUIPMENT FOR STRAIGHTENING MULTIPLE CUT STEEL STRIP 失效
公开(公告)号：JPH09155450A
公开(公告)日：1997-06-17
申请号：JP31679095
申请日：1995-12-05
申请人： KAWASAKI STEEL CO
发明人： KANEMOTO NORIO
IPC分类号： B21B39/14 , B21D1/05
摘要： PROBLEM TO BE SOLVED: To correct the warp in the vertical direction of a split steel strip in the passing direction without generating any transverse bend by separating each split steel strip which is multiply slit so that the end part is not brought close to each other, and passing it through a leveler roller. SOLUTION: A straightening device is located on the downstream side of a slitter 3 to slit a hot rolled steel strip stock 6 which is uncoiled and travels on the line into a plurality of strips in the longitudinal direction. Each slit steel strip 5 is apt to be brought close to each other, and a split guide 1 to make a definite clearance between adjacent strips is provided on the inlet side of a lever 2 so as to prevent the close contact. The strip can be vertically straightened in the passing direction while generation of the transverse bend is prevented within the leveler 2.

3. 发明专利

JP2001279377A HOT DIP GALVANIZED STEEL SHEET EXCELLENT IN SPOT WELDABILITY AND ITS PRODUCTION METHOD 失效
公开(公告)号：JP2001279377A
公开(公告)日：2001-10-10
申请号：JP2000096105
申请日：2000-03-31
申请人： KAWASAKI STEEL CO
发明人： KANEMOTO NORIO
IPC分类号： C21D9/46 , C22C38/00 , C22C38/06 , C22C38/12
摘要： PROBLEM TO BE SOLVED: To provide a hot dip galvanized steel sheet with a composite structure in which the formation of a composite structure is attained without adding a large amount of Si and P harmful to plating properties and spot weldability. SOLUTION: This hot dip galvanized steel sheet excellent in spot weldability has a composition containing, by mass, 0.02 to 0.1% C, =90%.

4. 发明专利

JPH10195588A HOT ROLLED HIGH TENSILE STRENGTH STEEL PLATE EXCELLENT IN FORMABILITY AND COLLISION RESISTANCE AND ITS PRODUCTION 失效
公开(公告)号：JPH10195588A
公开(公告)日：1998-07-28
申请号：JP34923896
申请日：1996-12-27
申请人： KAWASAKI STEEL CO
发明人： TAKAGI SHUSAKU , MIURA KAZUYA , FURUKIMI OSAMU , OBARA TAKASHI , KANEMOTO NORIO , KATAOKA KUNIHIKO
IPC分类号： C21D8/02 , C21D9/46 , C22C38/00 , C22C38/04 , C22C38/22 , C22C38/38
摘要： PROBLEM TO BE SOLVED: To produce a thin hot rolled high tensile strength steel sheet having the characteristics of 490 to 980MPa tensile strength, =25% total elongation and >=250MJ/m absorbed energy to 0.3 true strain in tensile testing at a strain rate of 2000sec and excellent in formability and collision resistance. SOLUTION: As for a steel stock having a componental compsn. contg., by weight, 0.02 to 0.2% C, 0.1 to 1.5% Si, 0.5 to 3.0% Mn and 0.010% S, furthermore contg. one or >= two kinds selected from 0.03 to 0.15% Mn, 0.1 to 2.0% Cr and 0.1 to 1.0% Mo, and the balance Fe with inevitable impurities, hot rolling is finished at the Ar3 transformation point or above, within 0.1 to 5.0sec after that, cooling is started, it is cooled to 620 to 800 deg.C at a cooling rate of >=50 deg.C/sec, is subjected to air cooling for 0.5 to 15sec, is next cooled to 300 to 600 deg.C at a cooling rate of >=30 deg.C/sec and is coiled to form its structure into the one in which ferritic phases having

5. 发明专利

JPH0824937A METHOD FOR CLEANING SURFACE OF STEEL SHEET 失效
公开(公告)号：JPH0824937A
公开(公告)日：1996-01-30
申请号：JP16540894
申请日：1994-07-18
申请人： KAWASAKI STEEL CO
发明人： SHIMIZU MASUHITO , AOYAMA NAOTOSHI , ADACHI AKIO , OGAWA HIROYUKI , KUWAKO HIROSHI , SHIRAISHI MASASHI , KANEMOTO NORIO
IPC分类号： B21B45/00 , B21B45/08 , C23G5/00
摘要： PURPOSE:To surely remove the scale with difficult peelabifity by striking the liquid drop generated in the liquid drop flow region of the liquid flow discharged from a nozzle on the surface of the steel sheet of the prescribed temperature. CONSTITUTION:The liquid is discharged from a nozzle, and the liquid drop generated in the liquid drop flow region is struck on the surface of the steel sheet of >=850 deg.C. The scale of the structure which may bite in the metal can be removed to clean the surface of the steel sheet. In the case of the steel sheet containing Si of >=0.5wt%, the surface temperature is >=850 deg.C, and the liquid is discharged from the nozzle to satisfy the relationship between the discharge pressure P and the discharge amount W of P(kg/cm )XW(litre/ cm )>=0.8X(wt.% Si). This constitution prevents the generation of the scale flaw on the hot rolled steel sheet.

6. 发明专利

JPH07248222A METHOD FOR MEASURING SHAPE OF HOT-ROLLED STEEL PLATE 失效
公开(公告)号：JPH07248222A
公开(公告)日：1995-09-26
申请号：JP4021994
申请日：1994-03-11
申请人： KAWASAKI STEEL CO
发明人： NAKADA NAOKI , OGAWA HIROYUKI , KUWAKO HIROSHI , ISHIBASHI TOKUHARU , KANEMOTO NORIO
IPC分类号： G01B21/20 , C21D9/573
摘要： PURPOSE:To provide a method for measuring a shape of a hot-rolled steel plate after being cooled. CONSTITUTION:A surface temperature in a widthwise direction of a steel plate cooled after being hot rolled is continuously measured at least at three points of a central part and both end parts. An average temperature at each measuring point within a reference measuring time DELTAt is calculated every moment. The measuring point showing the highest value among the calculated average temperature is selected and a temperature difference delta between the maximum and minimum values of the measured temperature at the selected position is obtained. If the temperature difference delta is equal to or larger than a preset reference temperature difference deltaS, the steel plate is judged to be improper in shape. When the average temperature at the central part is higher than the average temperature at both end parts, the steel plate is judged to form wave in the middle part. When the average temperature of each of both end parts is higher than that of the central part, the steel plate is judged to have waves in both edges. Meanwhile, when the average temperature at one end part is lower than that at the central part, a wave in one edge is judged. Moreover, when the average temperature of the left end part is higher than that at the right end part, a wave in the left edge is determined. To the contrary, if the average temperature at the right end part is higher than that at the left end part, the steel plate is judged to have a wave in the right edge.

7. 发明专利

JPH05311328A 失效
公开(公告)号：JPH05311328A
公开(公告)日：1993-11-22
申请号：JP12226192
申请日：1992-05-14
申请人： KAWASAKI STEEL CO
发明人： KANEMOTO NORIO , CHIBA HITOSHI
IPC分类号： C22C38/00 , C22C38/14
摘要： PURPOSE:To maintain superior porcelain enameling characteristics without deteriorating fishscale resistance and also to improve workability by providing a composition consisting of respectively specified amounts of C, Mn, S, N, O, Si, Ti, B, and P and the balance essentially Fe. CONSTITUTION:This steel has a composition consisting of, by weight,

8. 发明专利

JP2000080440A HIGH STRENGTH COLD ROLLED STEEL SHEET AND ITS MANUFACTURE 失效
公开(公告)号：JP2000080440A
公开(公告)日：2000-03-21
申请号：JP24617598
申请日：1998-08-31
申请人： KAWASAKI STEEL CO
发明人： TOSAKA AKIO , KANEMOTO NORIO , MEJIKA SETSUO , UCHIYAMA TAKAO
IPC分类号： C21D9/46 , C22C38/00 , C22C38/12 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a high strength cold rolled steel sheet having >=780 MPa tensile strength and >=70 MPa amount of baking hardening and combining excellent stretch-flange formability, spot weldability, delayed fracture resistance, and impact resistance. SOLUTION: A steel stock, having a composition in which 1.5-3.5%, by weight, Mn and 0. 005-0.10% Nb are contained and further the amounts of C, Si, P, S, Al, and N are regulated to proper values, respectively, is heated to a temperature at which the amount of Nb unentered into solid solution becomes >=0.003%, finish rolled at 950 to 800 deg.C finish rolling delivery-side temperature, coiled at 700 to 400 deg.C coiling temperature, and cold rolled. The resultant steel sheet is annealed at >=800 deg.C annealing temperature, rapidly cooled continuously down to =15 deg.C/min cooling rate, and then cooled rapidly down to room temperature. By this procedure, a structure composed essentially of fine bainitic structure of

9. 发明专利

JPH0770649A PRODUCTION OF HOT ROLLED STEEL SHEET EXCELLENT IN STRETCH-FLANGE FORMABILITY, DUCTILITY AND SURFACE PROPERTY 失效
公开(公告)号：JPH0770649A
公开(公告)日：1995-03-14
申请号：JP21866293
申请日：1993-09-02
申请人： KAWASAKI STEEL CO
发明人： KANEMOTO NORIO , MATSUBAYASHI CHISATO , KATAOKA KUNIHIKO , SUMINAGA TOMOTAKE
IPC分类号： C21D8/02 , C21D9/46 , C22C38/00 , C22C38/04
摘要： PURPOSE:To obtain a hot rolled steel sheet of a specified strength level excellent in workability by heating Si strengthened steel having a specified compsn., thereafter subjecting it to rough rolling, specifying the temp. of the slab on the inlet side of a finishing mill, subjecting it to descaling by high pressure water under a specified collision pressure and executing finish rolling and coiling at specified temps. CONSTITUTION:Steel contg., by weight, 0.02 to 0.15% C, 0.2 to 1.0% Si, 0.5 to 1.5% Mn, collision pressure. Next, it is subjected to finish rolling at a finishing temp. of the Ar3 transformation point or above and is thereafter coiled at 400 to 600 deg.C. By this method, the hot rolled steel sheet of 45 to 55kgf/mm strength level excellent in workability can stably be obtd. without deteriorating its surface properties.

10. 发明专利

JP2002129376A METHOD FOR MANUFACTURING ZN-NI ALLOY ELECTROPLATED STEEL SHEET SUPERIOR IN CHIPPING RESISTANCE AT LOW TEMPERATURE 失效
公开(公告)号：JP2002129376A
公开(公告)日：2002-05-09
申请号：JP2000321387
申请日：2000-10-20
申请人： KAWASAKI STEEL CO
发明人： HISHIKI TERUHISA , KANEMOTO NORIO , YONEDA TOMOSHI
IPC分类号： C25D3/56 , C25D5/26 , C25D21/12
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing a Zn-Ni alloy electroplated steel-sheet, which manufactures the steel sheet superior in chipping resistance at low temperature by a simple and economically efficient process. SOLUTION: The method for manufacturing the Zn-Ni alloy electroplated steel-sheet superior in chipping resistance at low temperature, which electroplates a Zn-Ni alloy on a steel sheet several times using several Zn-Ni plating baths, is characterized by making Ni concentration of the first Zn-Ni plating bath from an entrance side of the steel sheet, or furthermore preferably both of the Ni concentration and current density of the above Zn-Ni plating bath, bigger than the Ni concentration of the second or later Zn-Ni plating bath, or furthermore preferably both of the Ni concentration and current density of the above Zn-Ni plating bath.

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