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21. 发明专利

JPH11343560A PRODUCTION OF HOT DIP ALUMINUM-ZINC ALLOY PLATED STEEL SHEET EXCELLENT IN CRACK RESISTANCE AND CORROSION-RESISTANCE 失效
公开(公告)号：JPH11343560A
公开(公告)日：1999-12-14
申请号：JP16618998
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 producing stage and adding special elements into a plating bath. SOLUTION: In the method for producing a hot dip Al-Zn alloy plated steel sheet in which, in continuous-type hot dip plating equipment, a steel sheet is annealed and is successively applied to hot dip plating in a hot dip Al-Zn plating bath contg. 20 to 95 wt.% Al, a steel sheet having surface roughness Ra (μm) satisfying the inequality of [(100+80CW) -10]/40>=Ra in accordance with the coating weight CW (g/m ) per side of the plated steel sheet to be produced is used as an original sheet, and the hot dip plating of 10 to 45 g/m coating weight per side is applied. The plated steel sheet obtd. by this producing method has excellent crack resistance because of the reduced coating and moreover it has excellent corrosion resistance since the generation of spotlike rust in the pat subjected to severe working is suppressed.

22. 发明专利

JPH11343552A HOT DIP ALUMINUM-ZINC ALLOY PLATED STEEL SHEET EXCELLENT IN CORROSION RESISTANCE 失效
公开(公告)号：JPH11343552A
公开(公告)日：1999-12-14
申请号：JP16415198
申请日：1998-05-28
申请人： NIPPON KOKAN KK
发明人： OI TOSHIHIKO , INAGAKI JUNICHI , YAMASHITA MASAAKI , ISHIDA NOBUYUKI , JIROUMARU KAZUMI , OKUMA TOSHIYUKI
IPC分类号： C23C22/30 , C23C2/06 , C23C2/12 , C23C28/00
摘要： PROBLEM TO BE SOLVED: To provide a hot dip Al-Zn alloy plated steel sheet capable of stably containing excellent corrosion resistance. SOLUTION: In this hot dip Al-Zn alloy plated steel sheet containing 20 to 95 wt.% Al in a plating film, the ratio d/i of Al conc. (d) in the dendrite parts to that (i) in the inter-dendrite parts in the plated film is 1.5. Preferably, the coating weight of the plated film is regulated to >=45 g/m per one side.

23. 发明专利

JPH11343551A HOT DIP ALUMINUM-ZINC ALLOY PLATED STEEL SHEET EXCELLENT IN CORROSION RESISTANCE 失效
公开(公告)号：JPH11343551A
公开(公告)日：1999-12-14
申请号：JP16415098
申请日：1998-05-28
申请人： NIPPON KOKAN KK
发明人： OI TOSHIHIKO , INAGAKI JUNICHI , YAMASHITA MASAAKI , ISHIDA NOBUYUKI , JIROUMARU KAZUMI , OKUMA TOSHIYUKI
IPC分类号： C23C22/30 , C23C2/06 , C23C2/12 , C23C28/00
摘要： PROBLEM TO BE SOLVED: To obtain a plated steel sheet excellent in corrosion resistance by laminating substantially >=2 layers of dendrite in the thickness direction of a plated film having a specified content of Al. SOLUTION: Al is incorporated by 20-95 wt.% into a plate film. The coated weight of the plated film is adjusted to >=45 g/m per one side, and a chemically treated film is preferably formed on the surface of the plated film or a coating film on the surface. The chemically treated film is a chromate film formed by applying a chromating soln. contg. chromic acid with the weight ratio of Cr(VI) to total Cr adjusted to 0.3-1.0 and drying the soln., and the coated weight of the chromate film is adjusted preferably to 3-80 mg/m , expressed in terms of metallic chromium. Since >=2 layers of dendrite are laminated in the thickness direction of the plated film, an intricate path is formed until the dendritic gap is extended from the film surface to the boundary alloy layer to suppress the progress of corrosion, and excellent corrosion resistance is stably obtained.

24. 发明专利

JPH10298729A GALVANIZED STEEL SHEET FOR ORGANIC RESIN-COATED STEEL SHEET EXCELLENT IN WORKING ADHESION AND CORROSION RESISTANCE, AND ITS PRODUCTION 失效
公开(公告)号：JPH10298729A
公开(公告)日：1998-11-10
申请号：JP10718197
申请日：1997-04-24
申请人： NIPPON KOKAN KK
发明人： YAMAJI TAKAFUMI , MATSUZAKI AKIRA , YAMASHITA MASAAKI , INOUE NORIO , JIROUMARU KAZUMI
IPC分类号： C23C22/24 , C23C2/06 , C23C2/26 , C23C22/30 , C23C22/33
摘要： PROBLEM TO BE SOLVED: To provide a galvanized steel sheet used for an organic resin-coated steel sheet, in which an organic resin coating particularly having >=100 μm coating thickness is formed via adhesives, excellent in adhesion after working, adhesion resistant to water, corrosion resistance in edge faces and corrosion resistance in the cross-cut part and easily producible as well. SOLUTION: This is a surface treated steel sheet, in which a zinc or zinc- based alloy plated layer and a chemically treated layer are formed on a steel sheet, in which the chemically treated layer is the one contg. fumed silica and chromic acid compounds of 9 to 14 nm primary particle size, the blending ratio in the case the coating weight of fumed silica is expressed in terms of SiO2 and the coating weight of chromium acid compounds is expressed in terms of metallic Cr is regulated, in weight ratio, to 3 to .

25. 发明专利

JPH07303914A TEMPER ROLLING EQUIPMENT FOR METALLIC SHEET 失效
公开(公告)号：JPH07303914A
公开(公告)日：1995-11-21
申请号：JP12426094
申请日：1994-05-13
申请人： NIPPON KOKAN KK , HOTANI KK
发明人： HIGAKI KOZO , JIROUMARU KAZUMI , SATO SHOGO , KATAOKA TSUNEAKI , NAKAO NOBUYUKI , HOTANI SETSUO
IPC分类号： B08B1/04 , B21B1/22 , B21B45/02 , B24B5/38 , B24B53/00
摘要： PURPOSE:To provide temper rolling equipment for metallic sheets with which deterioration of surface property of a metallic sheet due to the inclusion of foreign matters is prevented and the metallic sheet having the uniform and clean surface is efficiently obtained. CONSTITUTION:This equipment is provided with a temper rolling mill 4, dry brush rolls 5a, 5b, receiving rolls 6a, 6b companion to the brush rolls and dust collecting ducts 19a, 19b in proximity to the dry brush rolls 5a, 5b in the front of the inlet side of the mill and the peripheral surfaces of the dry brush rolls 5a, 5b are brought into contact with the surfaces of the metallic sheet 1. Further, bristles are made of engineering plastics or polypropylene base materials, the sectional diameter of the bristle is 0.1-0.8mm, the flocking density of the brush 10-50 area% and =#1000 are contained in the brush or the abrasive grains are not contained.

26. 发明专利

JPH07299506A METALLIC STRIP 失效
公开(公告)号：JPH07299506A
公开(公告)日：1995-11-14
申请号：JP9535794
申请日：1994-05-10
申请人： NIPPON KOKAN KK
发明人： FUJITA FUMIO , NAKANISHI HARUYUKI , WATANABE AKITOSHI , KAKUHARI FUMIO , JIROUMARU KAZUMI , TAKAHASHI RYOICHIRO
IPC分类号： B21B15/00 , B21C47/26
摘要： PURPOSE:To prevent the generation of a lap mark and top mark at the time of coiling in a metallic strip treating process, to improve the quality of product and to save resources by providing plural shapes having the width of the tip parts narrowed in the width direction on one or more of the longitudinal end parts of a metallic strip. CONSTITUTION:To prevent the lap mark at the time of coiling the strip in a metallic strip treating process or the next or the next after the next metallic strip treating process, such plural worked parts as the width of the tip parts is narrowed like a triangular shape or shapes similar to them or the like are imparted in the precedingly taken tip part of the metallic strip for preventing stress concentration. When the strip is coiled as it is in the metallic treating process, by tapering thickness also by ordinary work combined with ordinary rolling work in the metallic strip treating process or low load rolling work to only the worked parts, the lap mark is further reduced.

27. 发明专利

JPH07242945A PRODUCTION OF HIGH CARBON COLD ROLLED STEEL SHEET EXCELLENT IN SHORT TIME HARDENABILITY 失效
公开(公告)号：JPH07242945A
公开(公告)日：1995-09-19
申请号：JP3613594
申请日：1994-03-07
申请人： NIPPON KOKAN KK
发明人： TOKOTSUME MAKOTO , INOUE TADASHI , TACHIBANA HIROSHI , JIROUMARU KAZUMI
IPC分类号： C21D8/02 , C21D9/46 , C22C38/00 , C22C38/58
摘要： PURPOSE:To provide a method for producing a high carbon cold rolled steel sheet small in thermal deformation at the time of hardening and capable of stably obtaining required hardenability in a short time. CONSTITUTION:A steel having a compsn. contg., by weight, 0.3 to 1.3% C, 0.10 to 0.30% Si, 0.05 to 0.25% Cr, =5% hydrogen, =0.8% and is subjected to skinpass rolling. At the time of the cold rolling or skinpass rolling, mirror-like gloss of 50 to 500 glossiness is imparted to the material surface. By these methods, the high carbon steel sheet excellent in short time hardenability can be obtd.

28. 发明专利

JPH07197193A PRODUCTION OF HIGH CARBON COLD-ROLLED STEEL SHEET EXCELLENT IN HARDENABILITY OF SHORT TIME 失效
公开(公告)号：JPH07197193A
公开(公告)日：1995-08-01
申请号：JP35102293
申请日：1993-12-29
申请人： NIPPON KOKAN KK
发明人： TOKOTSUME MAKOTO , INOUE TADASHI , TACHIBANA HIROSHI , JIROUMARU KAZUMI
IPC分类号： C21D8/02 , C21D6/00 , C21D9/46 , C22C38/00 , C22C38/40
摘要： PURPOSE:To obtain a high carbon steel sheet, in which the necessary hardenability is stably obtd. with extremely little thermal deformation at the time of quenching for a short time, by executing hot-rolling to a steel of a specific composition at a specific coiling temp. and cold-rolling, etc., in a specific condition, and specifying its surface roughness at the time of cold-rolling. CONSTITUTION:The steel containing, by wt.%, 0.3-1.3 C, 0.10-0.30 Si, 0.05-0.25 Cr, =5% hydrogen content, =0.8%), for 2-25hr followed by a temper-rolling. At the time of temper-rolling or at the time of cold-rolling following the temper-rolling, the surface is imparted with a roughness of 0.1-0.4mu Ra.

29. 发明专利

JPH05123950A ROLLING ROLLER GRINDING METHOD 失效
公开(公告)号：JPH05123950A
公开(公告)日：1993-05-21
申请号：JP24496691
申请日：1991-08-30
申请人： NIPPON KOKAN KK , KURENOOTON KK
发明人： TOKUNAGA MUNEYASU , KAKUHARI FUMIO , JIROUMARU KAZUMI , MORITA YOSHIYUKI , YAMAMOTO SHIGERU
IPC分类号： B21B28/02 , B24B5/37 , B24B53/00
摘要： PURPOSE:To grind a rolling roller efficiently and reduce wear and nicks by preparing rotary grinding wheel raw material with cubic system silicon nitride used as abrasive grain and vitrifying material used as a binder, and bringing this rotary grinding wheel raw material into contact with the peripheral surface of a continuously rotated rolling roller while rotating the rotary grinding wheel raw material. CONSTITUTION:A rotary grinding wheel 2 driven by a motor 1 is brought into contact with a rolling roller 4 and fed by a feed means 5 to perform grinding. Because of being large-sized, the rolling roller 4 is rotated while being supported not at the center but at the roll necks by rest work or the like, and ground in such a way that the drum part peripheral surface of the roll 4 is formed into curved surface, that is, convex and concave. The rotary grinding wheel 2 used in this case is of integrally formed structure with cubic system silicon nitride used as abrasive grain and vitrifying material used as a binder, and the cubic system silicon nitride used in this case is formed by applying high- temperature high-pressure treatment to hexagonal system boron nitride under the existence of an appropriate catalyst.

30. 发明专利

JPH0557583A GRINDING METHOD OF MILL ROLL 失效
公开(公告)号：JPH0557583A
公开(公告)日：1993-03-09
申请号：JP24496591
申请日：1991-08-30
申请人： NIPPON KOKAN KK , KURENOOTON KK
发明人： TOKUNAGA MUNEYASU , KAKUHARI FUMIO , JIROUMARU KAZUMI , MORITA YOSHIYUKI , YAMAMOTO SHIGERU
IPC分类号： B24B5/04 , B24B55/02
摘要： PURPOSE:To improve the operation efficiency by forming a job for mill roll grinding of high-speed steel, semihigh-speed steel or the like so efficiently, while securing roll surface roughness conformed to a product to be rolled freely according to truing speed and finishing feed rate, and executing each rolling smoothly without entailing any preparations and control over a lot of mill rolls. CONSTITUTION:A mill roll is ground by a grinding wheel made up of turning an abrasive grain to a cubic boron nitride and a binder into being vitrified, and either of feed rate at time of truing or feed rate at time of grinding or both are regulated, thus surface roughness of the ground roll is controlled.

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