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1. 发明专利

JPH0824914A COOLING DEVICE FOR ROLLING ROLL AND ROLLING MILL 失效
公开(公告)号：JPH0824914A
公开(公告)日：1996-01-30
申请号：JP16377994
申请日：1994-07-15
申请人： HITACHI LTD , NIPPON KOKAN KK
发明人： KIMURA TOMOAKI , SEKIYA TERUO , MASUDA SADAKAZU , JIROUMARU KAZUMI , HIGAKI KOZO
IPC分类号： B21B27/10
摘要： PURPOSE:To eliminate damage due to external force that is caused for example at the time of breaking of a rolled stock during rolling, in a cooling device of a rolling roll and in a rolling mill equipped with such device, and to prevent leak of a coolant to obtain a sufficient cooling effect. CONSTITUTION:In a cooling device 10 installed on the exit side of a rolling roll 51, a coolant is jetted from a spray nozzle 2 provided in a frame 1 and recovered in the frame 1. The frame 1 is movable back and forth against the rolling roll 51 by means of an actuator 20; when a pressure dealing with an external force actuating on the frame 1 exceeds a set pressure of a relief valve 27 at such time as the breaking of a rolling stock, the relief valve 27 is released, a piston 15 is detached from the rolling roll 51 and the frame 1 is retreated from the rolling roll 51. In addition, a high pressure air is jetted from a slit 6 on the end face of the frame 1 to form a gas knife.

2. 发明专利

JPH0615313A LOCAL SPRAY NOZZLE DEVICE FOR ROLLING ROLL AND DEVICE AND METHOD FOR LOCAL COOLING 失效
公开(公告)号：JPH0615313A
公开(公告)日：1994-01-25
申请号：JP17255692
申请日：1992-06-30
申请人： HITACHI LTD , NIPPON KOKAN KK
发明人： KIMURA TOMOAKI , SEKIYA TERUO , MASUDA SADAKAZU , JIROUMARU KAZUMI , HIGAKI KOZO
IPC分类号： B21B27/10 , B21B28/04
摘要： PURPOSE:To prevent the cooling ability from being changed even when the diameter of the rolling roll is varied, to limit a dispersing range of a jetted cooling liquid, to prevent the reduction of the concentration of the oil of a coolant for cooling a rolling roll and to accurately correct the shape of a rolled stock by surely, automatically and locally cooling defective places in the shape of a rolling roll with a local spray nozzle device. CONSTITUTION:The local spray nozzle devices are arranged in three places in total in the vicinities of the center part and both end parts in the axial direction of a work roll 1 and respectively provided with a 1st wall body 22, sealing part 24 which is provided in the end part of the 1st wall body 22 and for which the sealing degree is adjustable and 2nd wall body 23 with which the spray liquid 50 is enclosed in the inside of the 1st wall body 22. The cooling liquid after cooling the work roll 1 is recovered from a lower drainage port 26 through a clearance 23a.

3. 发明专利

JPH06335714A METHOD AND DEVICE FOR COOLING ROLLING ROLL 失效
公开(公告)号：JPH06335714A
公开(公告)日：1994-12-06
申请号：JP12740693
申请日：1993-05-28
申请人： HITACHI LTD , NIPPON KOKAN KK
发明人： KIMURA TOMOAKI , SEKIYA TERUO , MASUDA SADAKAZU , JIROUMARU KAZUMI , HIGAKI KOZO
IPC分类号： B21B27/10 , B21B37/00 , B21B37/32
摘要： PURPOSE:To enable using cold cooling water to cool a rolling roll without affecting the concentration and temp. of rolling oil in a method and device for cooling the rolling roll by which defect in the shape of a thin plate material is corrected by cooling the rolling roll of a thin plate rolling mill. CONSTITUTION:Many nozzles 7 are arranged in the axial direction of the rolling roll 2 on the outlet side of the roll 2 and cooling water is selectively gushed from these nozzles 7. The cooling water is recovered in a frame body 6 which is provided in facing to the roll and conducted to the outside with a hose 9. And a narrow slit hole 12 is formed on the frame body 6 of the outlet side in the direction of rotation of the roll 2 and, in this way, a gas knife 12A is formed by gushing a gaseous body and flowing-out of cooling water layer which flows adhering to the roll is prevented.

4. 发明专利

JPH0615315A HEAT CROWN CONTROLLER FOR ROLLING ROLLS 失效
公开(公告)号：JPH0615315A
公开(公告)日：1994-01-25
申请号：JP19468892
申请日：1992-06-30
申请人： HITACHI LTD , NIPPON KOKAN KK
发明人： KIMURA TOMOAKI , SEKIYA TERUO , MASUDA SADAKAZU , JIROUMARU KAZUMI , HIGAKI KOZO
IPC分类号： B21B27/10 , B21B37/00 , B21B37/32
摘要： PURPOSE:To solve problems such as the occurrence of an overflow in a rolling mill oil circulation working system, the aggravation of a working balance due to rolling density variation and the aggravation of a rolling mill oil consumption unit due to lowering of density by improving recovering efficiency of cooling water and suppressing mixture of cooling water into a rolling mill oil coolant tank in roll heat crown control constitution of a cooling water spray system. CONSTITUTION:The open edge entire periphery of a cover frame 1 is brought into contact with the roll W surface liquid tightly via sealing devices 2, cooling water is sprayed on the roll W surface from a nozzle 32 of a sprayer in the cover frame 1 and cooling water stayed in the cover frame 1 is recovered by a recovering hole 40 and a return pipe 41 of a recovering device.

5. 发明专利

JPH11343558A PRODUCTION OF HOT DIP ALUMINUM-ZINC ALLOY PLATED STEEL SHEET EXCELLENT IN CRACK RESISTANCE AND CORROSION RESISTANCE 失效
公开(公告)号：JPH11343558A
公开(公告)日：1999-12-14
申请号：JP16618798
申请日：1998-05-30
申请人： NIPPON KOKAN KK
发明人： INAGAKI JUNICHI , OI TOSHIHIKO , YAMAJI TAKAFUMI , YOSHIDA YASUHIDE , YAMASHITA MASAAKI , JIROUMARU KAZUMI , OKUMA TOSHIYUKI , ISHIDA NOBUYUKI
IPC分类号： C23C2/06 , C23C2/12 , C23C28/00
摘要： PROBLEM TO BE SOLVED: To stably produce a hot dip Al-Zn alloy plated steel sheet excellent in crack resistance and corrosion resistance without increasing the number of producing processes and without adding special elements into a plating bath. SOLUTION: In this method for producing a hot dip Al-Zn alloy plated steel sheet in a continuous hot dip plating equipment by annealing a steel sheet and successively subjecting to hot dip plating in a hot dip Al-Zn plating bath contg. 20 to 95 wt.% Al, the hot dip plating is executed in the plating bath in which the Al concn. [AL](wt.%) in the bath satisfies 0.25CW+40>=AL>=0.25 CW+34.5 (where 45>=CW>=10) in accordance with the coating weight [CW] (g/m ) per side of the plated steel sheet to be produced. The plated steel sheet obtd. by the method has excellent crack resistance by the reduction of the coating weight and has excellent corrosion resistance since the sacrificial anticorrosive operation by Zn and the rust stabilizing operation by Al can be exhibited in a well balance.

6. 发明专利

JPH11343555A HOT DIP ALUMINUM-ZINC ALLOY PLATED STEEL SHEET EXCELLENT IN CRACK RESISTANCE 失效
公开(公告)号：JPH11343555A
公开(公告)日：1999-12-14
申请号：JP16618498
申请日：1998-05-30
申请人： NIPPON KOKAN KK
发明人： INAGAKI JUNICHI , OI TOSHIHIKO , YAMAJI TAKAFUMI , YOSHIDA YASUHIDE , YAMASHITA MASAAKI , JIROUMARU KAZUMI , OKUMA TOSHIYUKI , ISHIDA NOBUYUKI
IPC分类号： C23C22/30 , C23C2/06 , C23C2/12 , C23C28/00
摘要： PROBLEM TO BE SOLVED: To obtain a hot dip Al-Zn alloy plated steel sheet excellent in crack resistance and capable of being produced without increasing the number of producing processes and without adding special elements into a plating bath. SOLUTION: In this hot dip Al-Zn series alloy plated steel sheet containing 20 to 95 wt.% Al in a plated film, based on the knowledge that, the difference in the hardness between the dendrite parts and the inter-dendrite parts is more reduced, them the opening width of each crack is more reduced, thus deterioration in the appearance of the plated film caused by cracks can be suppressed, the ratio d/i of the hardness (d) in the dendrite parts to that (i) in the inter- dendrite parts in the plated film is regulated to >=0.40. Preferably, the micro- Vickers hardness Hv of the inter-dendrite parts is regulated to

7. 发明专利

JPH10110276A GALVANIZED STEEL PLATE FOR ORGANIC RESIN COATED STEEL PLATE EXCELLENT IN ADHESION AND CORROSION RESISTANCE AND ITS PRODUCTION 失效
公开(公告)号：JPH10110276A
公开(公告)日：1998-04-28
申请号：JP26719696
申请日：1996-10-08
申请人： NIPPON KOKAN KK
发明人： YAMAJI TAKAFUMI , MATSUZAKI AKIRA , YAMASHITA MASAAKI , INOUE NORIO , JIROUMARU KAZUMI
IPC分类号： B05D7/14 , B32B15/08 , C23C2/06 , C23C22/24 , C23C28/00
摘要： PROBLEM TO BE SOLVED: To provide a galvanized steel plate used for an organic resin coated steel plate, on which particularly a >=10μm thickness organic coating film is formed through an adhesive, excellent in adhesion after processed, water resistant adhesive property, corrosion resistance at an end face and corrosion resistance at a cross cut part and easily producible. SOLUTION: A surface treated steel plate has a zinc or zinc based alloy plated layer and a chemical conversion treated layer formed on a steel plate. In such a case, the chemical conversion treated layer contains a fumed silica having >=9nm to =3 to =25mg/m to .

8. 发明专利

JPH07166243A PRODUCTION OF HIGH CARBON STEEL COLD ROLLED STEEL STRIP 失效
公开(公告)号：JPH07166243A
公开(公告)日：1995-06-27
申请号：JP30997193
申请日：1993-12-10
申请人： NIPPON KOKAN KK
发明人： INOUE TADASHI , TOKOTSUME MAKOTO , TACHIBANA HIROSHI , JIROUMARU KAZUMI
IPC分类号： C21D8/02 , C21D9/46
摘要： PURPOSE:To produce a cold rolled steel strip excellent in stretch-flanging properties by subjecting a high carbon slab in which the content of S as harmful impurities is reduced to working by the hot rolled sheet coiling temp., the work roll diameter for intermediate cold rolling, the intermediate cold rolling rate, process annealing conditions and finish cold rolling conditions by specified conditions. CONSTITUTION:A high carbon steel slab contg., by weight, 0.3 to 1.3% C and in which the content of S is limited to 50vol.% hydrogen concn., =0.8% C content. Successively, it is subjected to finish cold rolling at 15 to 35% cold rolling ratio and is thereafter subjected to soaking treatment at 600 to 720 deg.C for 1 to 6hr.

9. 发明专利

JPH0797616A PRODUCTION OF COLD ROLLED STEEL SHEET EXCELLENT IN CHEMICAL CONVERTIBILITY 失效
公开(公告)号：JPH0797616A
公开(公告)日：1995-04-11
申请号：JP24541093
申请日：1993-09-30
申请人： NIPPON KOKAN KK
发明人： SATO SHOGO , JIROUMARU KAZUMI
IPC分类号： C21D9/46 , C21D1/26 , C21D1/76
摘要： PURPOSE:To produce a cold rolled steel sheet excellent in chemical convertibility. CONSTITUTION:At the time of subjecting a steel sheet after cold rolling to batch annealing, the atmospheric gas of the batch annealing is constituted of a reducing mixed gas of >=80% hydrogen concn. and =80% hydrogen concn. and

10. 发明专利

JPH0716647A METHOD FOR COILING STEEL SHEET 失效
公开(公告)号：JPH0716647A
公开(公告)日：1995-01-20
申请号：JP16223393
申请日：1993-06-30
申请人： NIPPON KOKAN KK
发明人： HASEGAWA HIROSHI , KONISHI MASAMICHI , JIROUMARU KAZUMI , FUJITA FUMIO
IPC分类号： B21C47/26
摘要： PURPOSE:To effectively prevent lap marks from being generated by nipping a top end part of a steel sheet between thermosetting resin sheets just before coiling the steel sheet from a rolling line, pushing heated dies on the steel sheet and press forming the resin sheet into a tapered shape on the top end part of the steel sheet. CONSTITUTION:Pressing surfaces of dies 23 (surfaces facing to a steel sheet) are made into tapered surfaces with their interval gradually narrowed downstream. Since resin sheets 28 arranged on the front surface and rear of the coil tip part of each die 23 are pressed by heated tapered dies 23 from upper and lower directions and press-formed into a tapered shape so that a coil end is smoothly formed without steps, and an adhesive strength enough to prevent stripping can be obtained. In this case, since the resin sheets 28 at the tip part of the steel sheet have elasticity and steps are absorbed by the sheets 28 a lap mark is not generated on the steel sheet of a second and succeeding turns. Therefore, the lap mark is practically eliminated at the time of winding the steel sheet by treating the tip part in this process before coiling.

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