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1. 发明专利

JP2003105446A HIGH STRENGTH HOT ROLLED STEEL SHEET, AND PRODUCTION METHOD THEREFOR 审中-公开
公开(公告)号：JP2003105446A
公开(公告)日：2003-04-09
申请号：JP2001294016
申请日：2001-09-26
申请人： NIPPON KOKAN KK
发明人： NAKADA HIROSHI , INOUE TADASHI , KIKUCHI HIROYASU , IMADA SADANORI
IPC分类号： B21B1/26 , B21B3/00 , B21B45/00 , C21D1/42 , C21D9/46 , C22C38/00 , C22C38/06 , C22C38/38
摘要： PROBLEM TO BE SOLVED: To provide a high strength hot rolled steel sheet of a relatively low alloy which has excellent workability, and to provide a production method therefor. SOLUTION: Steel containing 0.06 to 0.25% C, 150 deg.C/s, and the cooling is stopped at

2. 发明专利

JP2002205108A HOT RUN TABLE FOR CONVEYING HOT-ROLLED STEEL STRIP 失效
公开(公告)号：JP2002205108A
公开(公告)日：2002-07-23
申请号：JP2000401884
申请日：2000-12-28
申请人： NIPPON KOKAN KK
发明人： IMADA SADANORI , JINNAI TATSUYA
IPC分类号： B21B39/00 , B21B39/12
摘要： PROBLEM TO BE SOLVED: To provide a hot run table the life of a belt-like or a rope-like body of which is prolonged by suppressing the break of the body and which is obtained by slightly modifying a general hot run table. SOLUTION: In the hot run table for conveying hot-rolled steel strips which consists of a plurality of conveying table rollers having an annular groove for guiding the belt-like or the rope-like body in the peripheral direction of the outside surface, a cooling means for spraying cooling fluid onto the back surface of the hot-rolled steel strip after finish rolling between the conveying table rollers and the belt-like or the rope-like body which is guided to each annular groove of a plurality of the conveying table rollers along the longitudinal direction of the top face of the hot run table, a covering layer made of metal plating or heat-resistant resin is provided in at least the bottom part of the annular groove of the conveying table roller and the upper surface of the covering layer is taken as the substantial bottom part of the annular groove.

3. 发明专利

JP2002080935A HIGH STRENGTH THIN STEEL SHEET HAVING EXCELLENT WORKABILITY AND ITS PRODUCTION METHOD 失效
公开(公告)号：JP2002080935A
公开(公告)日：2002-03-22
申请号：JP2000259595
申请日：2000-08-29
申请人： NIPPON KOKAN KK
发明人： INOUE TADASHI , IMADA SADANORI , OTAKE TAKAYUKI , KIKUCHI HIROYASU
IPC分类号： B21B3/00 , C21D9/46 , C22C38/00 , C22C38/04 , C22C38/38
摘要： PROBLEM TO BE SOLVED: To provide a high strength thin steel sheet having excellent workability (a balance of strength-stretch flanging properties and a balance strength-ductility) and impact resistance and to provide its production method. SOLUTION: Steel having a composition containing, by weight, 0.04 to 0.1% C,

4. 发明专利

JP2002030347A METHOD FOR PRODUCING HIGH STRENGTH HOT DIP GALVANIZED STEEL SHEET 失效
公开(公告)号：JP2002030347A
公开(公告)日：2002-01-31
申请号：JP2000216316
申请日：2000-07-17
申请人： NIPPON KOKAN KK
发明人： NAGATAKI YASUNOBU , INOUE TADASHI , IMADA SADANORI
IPC分类号： C21D9/46 , C22C38/00 , C22C38/06 , C22C38/38
摘要： PROBLEM TO BE SOLVED: To provide a method for producing a high strength hot dip galvanized steel sheet by which excellent ductility can be imparted. SOLUTION: In this method for producing a high strength hot dip galvanized steel sheet, steel having a composition containing, by mass, 0.01 to 0.3% C, =Ar3 point, within 2.5 sec, the steel is cooled by rapid cooling at the average cooling rate of >=100 deg.C/sec to >500 to 700 deg.C, is thereafter coiled and is subsequently pickled or is further cold-rolled, and, in continuous hot dip galvanizing equipment, annealing is performed at >=720 deg.C. Moreover, steel further containing one or more kinds selected from 0.005 to 0.5% Nb and Ti and 0.0002 to 0.005% B or one or more kinds selected from 0.01 to 1% V, Cr and Mo is used.

5. 发明专利

JP2002079307A HOT RUN TABLE FOR CONVEYING HOT-ROLLED STEEL STRIP, AND CONVEYING METHOD 失效
公开(公告)号：JP2002079307A
公开(公告)日：2002-03-19
申请号：JP2000271453
申请日：2000-09-07
申请人： NIPPON KOKAN KK
发明人： IMADA SADANORI , MOTOYASHIKI YOICHI , MINOTE TORU , TAKAHASHI JUN
IPC分类号： B21B39/12 , B21B39/00
摘要： PROBLEM TO BE SOLVED: To provide a hot run table with which the running of a hot-rolled steel strip is stabilized by slightly modifying an ordinary hot run table and whose maintenance cost is low. SOLUTION: This hot run table for conveying the hot-rolled steel strip is provided with plural conveying table rollers having an annular groove for guiding a belt-shaped or a rope-shaped body in the peripheral direction of the outside, cooling means for spraying a cooling fluid onto the under surface of the hot-rolled steel strip after finish rolling between the conveying table rollers, the belt-shaped or the rope-shaped body which is guided in each annular groove of the plural conveying table rollers along the longitudinal direction of the top of the hot run table and moving devices for guiding the belt-shaped or the rope-shaped body for guiding the belt-shaped or the rope-shaped body to the conveying table roller and moving it.

6. 发明专利

JP2002018509A HOT RUN TABLE FOR CONVEYING HOT STEEL STRIP 失效
公开(公告)号：JP2002018509A
公开(公告)日：2002-01-22
申请号：JP2000200818
申请日：2000-07-03
申请人： NIPPON KOKAN KK
发明人： TAKAHASHI JUN , MINOTE TORU , MOTOYASHIKI YOICHI , IMADA SADANORI
IPC分类号： B65H20/02 , B21B39/00 , B21B39/12
摘要： PROBLEM TO BE SOLVED: To provide a hot run table with which the traveling of a hot steel strip 2 is stabilized by slightly modifying an ordinary hot run table and whose maintenance cost is lower. SOLUTION: This hot run table for conveying the hot steel strip is provided with a plurality of conveying table rollers 4 having an annular groove for guiding an endless belt in the direction of the outer peripheral surface, cooling means 9 for jetting a cooling fluid 10 to the under surface of the hot strip 2 after finish rolling between the table rollers 4, the endless belt 3 a part of which in the longitudinal direction is guided in each annular groove of the conveying table rollers 4 along the longitudinal direction of the top of the hot run table and a guide 8 for guiding a part in the longitudinal direction of the endless belt in each annular groove of the table rollers 4 and also guiding other parts in the longitudinal direction of the endless belt to the outside of the hot run table.

7. 发明专利

JP2001246411A DEVICE AND METHOD FOR COOLING HOT STEEL STRIP 失效
公开(公告)号：JP2001246411A
公开(公告)日：2001-09-11
申请号：JP2000056219
申请日：2000-03-01
申请人： NIPPON KOKAN KK
发明人： FUJIBAYASHI TERUO , IMADA SADANORI , HINO YOSHIMICHI , MINOTE TORU
IPC分类号： B21B45/02
摘要： PROBLEM TO BE SOLVED: To provide a cooling device and method of a hot steel strip for stably strongly cooling a steel strip to which tension is not applied on a run out table after the strip is delivered from the final finishing mill till the strip reaches a coiler. SOLUTION: On the run out table 3 where the steel strip 11 is conveyed on plural rotating roller tables 8 and between the roller tables, back-surface cooling nozzle groups 9 for jetting cooling water are installed in the positions just near to the steel strip and upper-surface cooling nozzle groups 10 which are installed ascendably and descendeably to the positions opposite to these back-surface cooing nozzle groups from above the line. Cooling water is vertically symmetrically jetted from these nozzles to the steel strip and the steel strip is passed through the approximately middle part where the streams jetted from upper and lower parts are joined.

8. 发明专利

JP2001240915A METHOD FOR PRODUCING EXTRA-LOW CARBON HOT-ROLLED STEEL STRIP AND ITS PRODUCING APPARATUS 失效
公开(公告)号：JP2001240915A
公开(公告)日：2001-09-04
申请号：JP2000056214
申请日：2000-03-01
申请人： NIPPON KOKAN KK
发明人： FUJIBAYASHI TERUO , HINO YOSHIMICHI , IMADA SADANORI , MINOTE TORU
IPC分类号： B21B3/00 , C21D9/46 , C21D9/48
摘要： PROBLEM TO BE SOLVED: To provide a method for producing an extra-low carbon hot-rolled steel strip by which the hot-rolled steel strip having fine crystallized grain size can stably and continuously be rolled without damaging the shape of the steel strip by utilizing ordinary hot-rolling processes and to provide its producing apparatus. SOLUTION: The extra-low carbon steel is rolled with a final finish rolling mill 2E at the possible final rolling reduction while satisfactorily keeping the ordinary steel strip shape and this steel strop finished at just above transformation temperature is rapidly cooled at >=200 deg.C/s cooling rate within 1.0 sec and in about 50-200 deg.C temperature dropping amount and, thereafter, the steel strip is wound at ordinary winding temperature. Further, a cooling apparatus in which the rapid cooling is conducted in a first cooling device 5 on a run-out 3 and the slow cooling is conducted in a second cooling device 6 is provided.

9. 发明专利

JP2001164322A THIN STEEL SHEET AND METHOD FOR PRODUCING THIN STEEL SHEET 失效
公开(公告)号：JP2001164322A
公开(公告)日：2001-06-19
申请号：JP2000268896
申请日：2000-09-05
申请人： NIPPON KOKAN KK
发明人： INOUE TADASHI , IMADA SADANORI , KIKUCHI HIROYASU , MOTOYASHIKI YOICHI
IPC分类号： B21B1/00 , B21B3/00 , C21D9/46 , C22C38/00
摘要： PROBLEM TO BE SOLVED: To provide a producing method capable of obtaining a high strength thin steel sheet excellent in workability including stretch-flanging properties, also uniform in mechanical properties and having various strength levels. SOLUTION: This method for producing a high strength thin steel sheet has a stage in which a continuously cast slab having a C content of =(Ar3 transformation point -20) deg.C, a stage in which the same is subjected to primary cooling to 500 to 800 deg.C at >120 deg.C/sec, a stage in which the same is let to cool for 1 to 30 sec, a stage in which the same is subjected to secondary cooling at >=20 deg.C/sec and a stage in which the same is coiled at 0.1 to 1.0 sec after the finish rolling, the primary cooling is started, and the variation of the temperature in the width direction of the coil and in the longitudinal direction thereof after the rapid cooling (maximum value-minimum value) is controlled to

10. 发明专利

JP2002178004A EQUIPMENT AND METHOD FOR HOT-ROLLING FOR HOT-ROLLED STEEL STRIP 失效
公开(公告)号：JP2002178004A
公开(公告)日：2002-06-25
申请号：JP2000382229
申请日：2000-12-15
申请人： NIPPON KOKAN KK
发明人： MINOTE TORU , INOUE TADASHI , IMADA SADANORI , IKEMUNE SHOZO , HINO YOSHIMICHI , FUJIBAYASHI TERUO , TOMITA SHOGO
IPC分类号： B21B1/26 , B21B45/00 , B21B45/02
摘要： PROBLEM TO BE SOLVED: To provide a method and equipment for hot-rolling for hot-rolled steel strips by which ferritic particles are adequately micronized and further more, the control of intermediate temperature (or cooling stopping temperature) is accurately performed by combining rapid cooling and slow cooling. SOLUTION: In the rolling method of the hot-rolled steel strip in which a slab is made into a rough bar with a roughing mill, the rough bar is made into the hot-rolled steel strip by performing finish rolling with a finishing mill, after that, the hot-rolled steel strip is conveyed on a hot run table and coiled with a coiler, this rolling method of the hot-rolled steel strip is provided with a heating stage where the rough bar is heated over the whole in the width direction between the final stand of the roughing mill and the final stand of the finishing mill and a cooling stage including rapid cooling by which the finish-rolled hot-rolled steel strip is cooled at >=200 deg.C/s by at least one or more cooling systems.

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