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1. 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.

2. 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

3. 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 .

4. 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.

5. 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.

6. 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

7. 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.

8. 发明专利

JPH0693343A BELL TYPE ANNEALING FURNACE 失效
公开(公告)号：JPH0693343A
公开(公告)日：1994-04-05
申请号：JP23811292
申请日：1992-09-07
申请人： CHUGAI RO KOGYO KAISHA LTD , NIPPON KOKAN KK
发明人： YAMAMOTO TADASHI , SAKURAGI KAZUMASA , JIROUMARU KAZUMI , SATO SHOGO , SAKURAI YOSHIMI , SUZUKI HIROYUKI , KIHARA MIKITO
IPC分类号： C21D9/663 , C21D1/74 , C21D1/767 , F27B11/00
摘要： PURPOSE:To shorten gas purge time, to prevent oxidation during treatment and to obtain the energy saving by arranging covers to a refractory material constituting a base in a bell type annealing furnace and a motor for stirring atmosphere in the furnace, fitted to the base. CONSTITUTION:The seal cover 12 is provided on the surface of the refractory material constituting the base 2 in the bell type annealing furnace providing an evacuating pipe 19 communicated with the inside of in an inner cover 5. Further, an out-furnace motor 4 for driving a circulating fan fitted to the lower surface of the base 2 is covered with the air-tight cover 13, and the inside of the seal cover 12 and the inside of the air-tight cover 13 are communicated with an evacuating device 17 and an N2 gas supplying source 18. By this method, at the time of fitting/removing the inner cover 5, the refractory material does not absorb moisture, and the moisture, air etc., in the refractory material are not discharged in the inner cover 5. Further, the gas purge time is shortened, and because moisture is not generated during the treatment, the oxidation is prevented from ocwring and the quality of the treating material is improved. Further, the gas in the inner cover 5 can perfectly be purged, and by making the pressures in the covers 12, 13 higher than the pressure in the inner cover 5, the discharge of atmosphere gas in the cover 5 is prevented and energy is saved.

9. 发明专利

JPH0688122A METHOD FOR CONTROLLING NUMBER OF REVOLUTIONS OF FAN IN BATCH TYPE ANNEALING FURNACE 失效
公开(公告)号：JPH0688122A
公开(公告)日：1994-03-29
申请号：JP23811592
申请日：1992-09-07
申请人： CHUGAI RO KOGYO KAISHA LTD , NIPPON KOKAN KK
发明人： MATSUSHITA FUSANOSUKE , JIROUMARU KAZUMI , SATO SHOGO , SAKURAI YOSHIMI , SUZUKI HIROYUKI , KIHARA MIKITO
IPC分类号： F27D7/06 , C21D1/74 , C21D1/767
摘要： PURPOSE:To utilize fan capacity to the max. without over-working a motor and to enable continuous driving at low speed by obtaining the permissible number of revolutions of the fan by a atmospheric density and the mixing ratio of nitrogen and hydrogen and temp. in a furnace and controlling. CONSTITUTION:In a batch type annealing furnace 1 for executing the heat treatment of a material to be treated by controlling the number of revolutions of the fan 8 with an inverter, the mixed gas of nitrogen and hydrogen is supplied into an inner cover 3 from an atmosphere supplying pipe 12, and the heating treatment is executed with a burner arranged at an outer cover 4. Based on the measured result of a hydrogen gas concn. analyzer 15 in the atmosphere through a sampling tube 13, the atmosphere density gamma is calculated to obtain the permissible number nWL of revolutions of the fan motor. On the other hand, the atmospheric temp. in the inner cover 3 is detected with a thermometer 16, and the permissible number nFL of revolutions limited to the number of revolutions decided from heat resistant strength of the fan 8 is obtd. The nWL and nFL are compared with each other by comparison treatment 24 for the number of revolutions, and by using the number of revolutions having the lower value, the fan 8 is driven.

10. 发明专利

JPH11343557A PRODUCTION OF HOT DIP AL-ZN ALLOY PLATED STEEL SHEET EXCELLENT IN CRACK RESISTANCE 失效
公开(公告)号：JPH11343557A
公开(公告)日：1999-12-14
申请号：JP16618698
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 produce a hot dip Al-Zn alloy plated steel sheet excellent in crack resistance without increasing the number of producing processes and without adding special elements into a plating bath. SOLUTION: In this method for producing a plated steel sheet in a continuous hot dip plating equipment by annealing a steel sheet and successively subjecting it to hot dip plating in a hot dip Al-Zn plating bath contg. 20 to 95 wt.% Al, after the hot dip plating, the plated steel sheet after the solidification of the plating film is reheated to a temp. region of more than the solid-liq. coexistent temp. of the plating metal and is, in the solid-liq. coexistent temp. region, subjected to heat-retention treatment for 1 to 120 sec or is subjected to slow cooling treatment at

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