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1. 发明专利

JP2001353562A DIRECT-FEED ROLLING METHOD OF CONTINUOUSLY CAST SLAB 失效
公开(公告)号：JP2001353562A
公开(公告)日：2001-12-25
申请号：JP2000176652
申请日：2000-06-13
申请人： NIPPON KOKAN KK
发明人： TSUTSUMI KOICHI , KAMIOKA SATOSHI , MINOTE TORU , MURATA SATOSHI , NAKADA MASAYUKI , SUZUKI MIKIO , KAWANAMI SHUNICHI
IPC分类号： B21B1/00 , B22D11/12 , B22D11/128 , B22D11/16
摘要： PROBLEM TO BE SOLVED: To produce a steel plate excellent in the surface characteristic by preventing defect caused by scale when the steel plate is produced by directly feeding and rolling a continuously cast slab. SOLUTION: In the direct-feed rolling method of the continuously cast slab producing the steel plate with the direct-feed rolling from the cast slab produced with a continuous caster, the surface roughness at the center part in the width direction of a long side surfaces of the cast slab produced with the continuous caster, is made to

2. 发明专利

JP2001353515A METHOD AND DEVICE FOR DEWATERING HIGH-TEMPERATURE STEEL SHEET 失效
公开(公告)号：JP2001353515A
公开(公告)日：2001-12-25
申请号：JP2000178429
申请日：2000-06-14
申请人： NIPPON KOKAN KK
发明人： KAMIOKA SATOSHI , FUJIBAYASHI TERUO , KAWANAKA TORU , MIYASATO TOSHIO , OKADA YUKIHIRO
IPC分类号： B21B45/02 , C21D1/00 , C21D9/52
摘要： PROBLEM TO BE SOLVED: To drain water which is retained on the upper surface of a steel sheet from the upper surface of the steel sheet. SOLUTION: A water jetting device 13 is arranged on the downstream side of an upper surface cooling device 1 and an air jetting device 14 is arranged on the downstream side of the water jetting device. On the jetting devices 13, 14, four nozzles 21 are respectively arrayed over the width direction of the line. The angle of the nozzle 21 is adjusted so that fluid is jetted toward the upper surface of the steel sheet 2, toward the upper surface cooling device 1 and toward an edge part 2a of the steel sheet 2. The retained water on the upper surface of the steel sheet 2 is discharged from the edge part 2a of the steel sheet 2 by allowing the water to be accompanied with the fluid jetted from the nozzle 21.

3. 发明专利

JP2001138021A METHOD FOR REDUCING CENTER SEGREGATION OF CONTINUOUS CAST SLAB 失效
公开(公告)号：JP2001138021A
公开(公告)日：2001-05-22
申请号：JP31802399
申请日：1999-11-09
申请人： NIPPON KOKAN KK
发明人： SUZUKI MIKIO , MURAKAMI KATSUHIKO , AWAJIYA HIROSHI , MITAO SHINJI , KAMIOKA SATOSHI
IPC分类号： B22D11/20 , B22D11/124 , B22D11/128
摘要： PROBLEM TO BE SOLVED: To surely obtain a reducing method of center segregation, with which the center segregation in a cast slab can be prevented at more than that of the conventional light rolling reduction method. SOLUTION: The light rolling reduction of the cast slab is started at a light rolling reduction zone 4 from the point of time when the solid phase ratio at the center part in the thickness direction of the cast slab 1 is

4. 发明专利

JPH11267738A COOLING METHOD OF HIGH TEMPERATURE STEEL PLATE 失效
公开(公告)号：JPH11267738A
公开(公告)日：1999-10-05
申请号：JP8830698
申请日：1998-03-18
申请人： NIPPON KOKAN KK
发明人： KAMIOKA SATOSHI , KIBE HIROSHI , FUJIBAYASHI TERUO , UCHIO MASATO , FUKUOKA KAZUYA
IPC分类号： B21B45/02 , C21D9/52 , C21D11/00
摘要： PROBLEM TO BE SOLVED: To reduce distortion generating in a steel plate and moreover to improve the precision of a stop temperature of the steel plate after cooling by symmetrizing a temperature distribution in the plate thickness direction of the upper and rear surfaces of the steel plate after leaving a cooling device. SOLUTION: A steel plate 4 is cooled by cooling water which is injected from spray nozzles 1 during it passes through between the spray nozzles 1 arranged in an upper surface and a rear surface. Also, restricting rolls 2, 3 are arranged in the upstream side and the downstream side of the spray nozzles 1, and cooling water is prevented from leaking out of the cooling device. The flow rate and temperature variation of a fluid which is injected on the upper surface of the steel plate 4 and the same on the rear surface of the same steel plate are separately measured, whereby the quantity of heat which is taken away from the upper surface of the steel plate 4 and the same from the rear surface of the same steel plate are separately obtained. Based on the obtained value, the flow rate of the fluid is adjusted so that the temperature distribution in the plate thickness direction of the steel plate after leaving the cooling device becomes symmetrical.

5. 发明专利

JPH11169941A METHOD FOR CONTROLLED COOLING THICK STEEL PLATE AND DEVICE THEREFOR 失效
公开(公告)号：JPH11169941A
公开(公告)日：1999-06-29
申请号：JP36229797
申请日：1997-12-12
申请人： NIPPON KOKAN KK
发明人： FUJIBAYASHI TERUO , KIBE HIROSHI , KAMIOKA SATOSHI , UCHIO MASATO , FUKUOKA KAZUYA , NAKANISHI TAKAYUKI
IPC分类号： B21B1/38 , B21B45/02 , C21D9/52 , C21D9/573
摘要： PROBLEM TO BE SOLVED: To accurately bring cooling stopping temp. close to the target and to eliminate irregular cooling by executing water cooling defining a speed as at a fixed 1st transporting speed during the tip part of a steel plate is passed through a cooling device, as at the 2nd transporting speed which is the accelerated 1st transporting speed during the intermediate part is passed through it and as at the fixed 3rd speed which is continued to the 2nd transporting speed during the rear end part is passed through it. SOLUTION: The 1st transporting speed is determined from the previously detected temp. of the tip part and temp. drop caused by cooling in the cooling device, the 3rd transporting speed is determined from the temp. of the rear end part which is estimated from the temp. of the tip part and temp. drop caused by cooling in the cooling device and the 2nd transporting temp. is determined by gradually accelerating the 1st transporting speed and so as to become the 3rd transporting speed. The tip part comes into the cooling device at the time of zero, the 1st and 3rd transporting speeds are respectively taken as the fixed speeds of 0.435 and 0.5 m/s and the tip part comes out the cooling device after 23s. The time after the tip end part is passed through the outlet of the cooling device till the rear end part reaches the inlet of the cooling device is determined as X and acceleration is executed in this period.

6. 发明专利

JPH1161248A PRODUCTION OF STEEL EXCELLENT IN LASER CUTTING PROPERTY 失效
公开(公告)号：JPH1161248A
公开(公告)日：1999-03-05
申请号：JP24021497
申请日：1997-08-22
申请人： NIPPON KOKAN KK
发明人： KIBE HIROSHI , FUJIBAYASHI TERUO , KAMIOKA SATOSHI , ISHIKAWA NOBUYUKI , KABASAWA MAKOTO
IPC分类号： B21B1/38 , C21D8/02
摘要： PROBLEM TO BE SOLVED: To obtain a thick steel plate having a scale excellent in adhesion and excellent in laser cutting property without limiting a chemical composition by injecting cooling water to a steel plate after hot rolling completion at a specified temp. and cooling/holding down to a specified temp. SOLUTION: A rolling completion temp. of a steel plate is set to 900-700 deg.C, generation of a FeO scale is suppressed during rolling. A steel plate after rolling is rapidly cooled by injecting cooling water, this cooling is stopped at 550-450 deg.C. This is to surely suppress FeO from regrowing at a temp. region of 900-570 deg.C after rolling. After cooling, the steel plate is held at 550-300 deg.C for >=10 min, isothermal transformation from FeO to Fe3 O4 at the inside of steel and a scale/ base iron boundary is promoted, scale adhesion is improved. A plate thickness of the steel plate is not limited, but a cooling rate of the steel plate is accelerated after hot rolling as a plate thickness is reduced so as hard to grow Fe3 O4 , a plate thickness is preferably >=6 mm.

7. 发明专利

JPH1157836A METHOD OF AND DEVICE FOR COOLING STEEL PLATE 失效
公开(公告)号：JPH1157836A
公开(公告)日：1999-03-02
申请号：JP21178297
申请日：1997-08-06
申请人： NIPPON KOKAN KK
发明人： FUJIBAYASHI TERUO , KIBE HIROSHI , KAMIOKA SATOSHI
IPC分类号： B21B45/02
摘要： PROBLEM TO BE SOLVED: To provide a device capable of cooling a steel plate at an even temperature in its width direction. SOLUTION: This cooling device comprises plurality of a water cooling headers 2a and 2b arranged along the cross direction of a carrying line and on the upper part of a steel plate carrying line, slit nozzles 4a and 4b arranged beneath the cooling water headers 2a and 2b capable of feeding the cooling water towards the on-going direction of the steel plate 22, and a transfer measure 5 which transfer cooling water header 2b located at the both ends among the cooling water headers 2a and 2b, towards the down stream side of the on-going direction of the steel plate 22.

8. 发明专利

JPH10323709A COOLING DEVICE FOR STEEL PLATE 失效
公开(公告)号：JPH10323709A
公开(公告)日：1998-12-08
申请号：JP13821797
申请日：1997-05-28
申请人： NIPPON KOKAN KK
发明人： TAKAHASHI ISAO , INOUE YOSHITAKA , NAKASEKO MAKOTO , KAMIOKA SATOSHI , TAKANE AKIRA , HIRATA NAOTO
IPC分类号： B21B45/02 , C21D9/52 , C21D9/573
摘要： PROBLEM TO BE SOLVED: To cool down evenly a below face of a steel plate by installing a cooling water screening board of rectangular shape. SOLUTION: The cooling device comprises a water tank 2 beneath the carrier line of a steel plate in which, standing upright and sinking in the water, a plural of pipes 3 are set to cool down the below face of the steel plate 32 by spraying the water upward accompanying the water from the tank 2. In said cooling device, which is movable in cross direction of steel plate 32, a screening board of rectangular shape 4 is arranged, between the upper part of pipe(s) 30 and the below face of the steel plate 32, to block the cooling water so that the neighbouring area of the edge in cross direction of the steel plate 32 is kept without cooled down.

9. 发明专利

JPH10216827A METHOD FOR CONTROL COOLING OF HOT ROLLED PLATE 失效
公开(公告)号：JPH10216827A
公开(公告)日：1998-08-18
申请号：JP1712397
申请日：1997-01-30
申请人： NIPPON KOKAN KK
发明人： KIBE HIROSHI , FUJIBAYASHI TERUO , SUGIYAMA SHUNICHI , TAKANE AKIRA , TAKAHASHI ISAO , TOMITA SHOGO , KAMIOKA SATOSHI
IPC分类号： B21B45/02 , C21D1/00
摘要： PROBLEM TO BE SOLVED: To suppress the enlargement of uneven cooling, and to enable even cooling by repeating strong cooling and weal cooling at least two times or more to the plate transferred on a table roller in divided plural cooling zones. SOLUTION: Spray system cooling nozzles 3 are provided toward the front surface and the rear surface of the plate 1 moving continuously on plural table rollers 2. The cooling zones are divided in each table roller unit. In the upside of each table roller 2, a dewatering roller 5 is provided on the plate 1. On each cooling nozzle 3 comprising each cooling zone, a flow rate regulating valve 6 is provided as a flow rate adjusting device. As the flow rate adjusting device, the flow rate regulating valve making it possible to regulate fine a flow rate is preferable. However, when the density of the quantity of water in each zone is set preliminary, an ON/OFF valve having only an ON/OFF function may be used.

10. 发明专利

JPH11267755A MANUFACTURE OF THICK STEEL PLATE AND STRAIGHTENING DEVICE USED IN IT 失效
公开(公告)号：JPH11267755A
公开(公告)日：1999-10-05
申请号：JP8830798
申请日：1998-03-18
申请人： NIPPON KOKAN KK
发明人： FUJIBAYASHI TERUO , KIBE HIROSHI , KAMIOKA SATOSHI
IPC分类号： B21B1/38 , B21B45/02 , B21D1/05 , C21D9/52
摘要： PROBLEM TO BE SOLVED: To provide a method capable of stably manufacturing online a steel plate the bar cutting distortion of which is small even though bar cutting is executed in the state of being cold and moreover which has homogeneous material quality over the whole steel plate. SOLUTION: After a thick steel plate 6 which is rolled with a finishing mill 1 is straightened into flatness with a hot straightening machine 2 so as to be suitable for being inserted into an accelerated cooling device 3, accelerated cooling is executed with the accelerated cooling device 3. The steel plate is cooled so that a temperature drop in the vicinity of the end part of the plate which is generated from a heating furnace to the completion of finish rolling is dissolved while being hot straightened in the forward stage part of the hot straightening machine 2 and moreover so that the temperature of the steel plate is not dropped to an Ar3 transformation point or below. In the backward stage part of the hot straightening machine 2, hot straightening is executed by being cooled in the open air so that the temperature of the both surfaces of the steel plate is recuperated in the position of the last leveling roll of the hot straightening machine 2 almost simultaneously with the completion of straightening. Thereafter, accelerated cooling is executed under a uniform cooling condition in the width direction to manufacture the steel plate.

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