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61. 发明专利

JPH06158256A HOT DIP ZN-AL COATED STEEL SHEET HAVING EXCELLENT APPEARANCE, AGE BLACKENING RESISTANCE AND CORROSION RESISTANCE 失效
公开(公告)号：JPH06158256A
公开(公告)日：1994-06-07
申请号：JP31669092
申请日：1992-11-26
申请人： NIPPON STEEL CORP
发明人： FUJII SHIRO , TAIRA TAKETOSHI
IPC分类号： C22C18/04 , C23C2/06 , C23C2/40 , C23C30/00
摘要： PURPOSE:To produce the hot dip Zn-Al coated steel sheet having excellent appearance, age blackening resistance and corrosion resistance by forming hot dip Zn-Al plating films contg. specific ratios of Al and Ti and having the spangle size of the surfaces of a specific value on the steel sheet. CONSTITUTION:The plating films of about 100 to 120g/m per surface of coating weight of plating are formed on the steel sheet by immersing the steel sheet into a hot dip coating bath (about 440 deg.C bath temp.) consisting of 3 to 10wt.% Al, 0.01 to 1wt.% Ti and the balance Zn and inevitable impurities. The cooling rate of the steel sheet is adjusted to about 15 to 100 deg.C/sec during the transition from about 400 deg.C to 380 deg.C to reduce the spangle size on the plating surfaces to

62. 发明专利

JPH0673521A GALVANNEALED STEEL SHEET EXCELLENT IN WELDABILITY 失效
公开(公告)号：JPH0673521A
公开(公告)日：1994-03-15
申请号：JP22682092
申请日：1992-08-26
申请人： NIPPON STEEL CORP
发明人： TAIRA TAKETOSHI , FUJII SHIRO , NAKAMURA FUMIAKI
IPC分类号： C23C2/06 , C23C2/28 , C23C2/40
摘要： PURPOSE:To obtain a galvannealed steel sheet excellent in weldability by specifying the amount of oxide film on a plated surface and the amount of Al in the amount of oxide film, respectively, in a galvannealed steel sheet. CONSTITUTION:The amount of oxide film on a plated surface of a galvannealed steel sheet is regulated to (50 to 100)mg/m , and also the amount of Al in the amount of oxide film is regulated to

63. 发明专利

JPH05306448A 失效
公开(公告)号：JPH05306448A
公开(公告)日：1993-11-19
申请号：JP11256892
申请日：1992-05-01
申请人： NIPPON STEEL CORP
发明人： FUJII SHIRO , TAIRA TAKETOSHI , NAKAMURA FUMIAKI
IPC分类号： C23C2/06 , C23C2/28
摘要： PURPOSE:To stably manufacture a high strength galvannealed steel sheet at the time of plating a steel sheet contg. P having specified concn. by a continuous galvanizing device having no oxidation free furnace by dividing a reduction furnace into plural zones and controlling the dew point of the atmosphere of each zone. CONSTITUTION:By the continuous galvanizing device having no oxidation free furnace, a steel sheet having >=0.03% P content is plated to manufacture a high strength galvannealed steel sheet. At this time, a reduction furnace is divided into >=two zones, the compsn, of the atmosphere of each zone is constituted of gaseous N2 contg, about 1 to 70% H2 and the dew point in controlled by introducing water vapor into the furnace. In a first zone, the dew point is controlled to be >=0 deg.C, and the thickness of an Fe oxide film on the surface of the steel sheet is regulated to 100 to 1000Angstrom . From a second and subsequent zone, the dew point is controlled so as to regulate the film thickness of an Fe oxide to about =0.03% P concn. is obtd. with good productivity.

64. 发明专利

JPH05306444A 失效
公开(公告)号：JPH05306444A
公开(公告)日：1993-11-19
申请号：JP11200392
申请日：1992-05-01
申请人： NIPPON STEEL CORP
发明人： NAKAMURA FUMIAKI , TAIRA TAKETOSHI , FUJII SHIRO
IPC分类号： C23C2/02 , C23C2/28 , C23C2/40
摘要： PURPOSE:To manufacture a high P-contg. high strength galvannealed steel sheet excellent in plating adhesion by forming an iron oxide film in an oxidizing zone on a high P-contg. high strength steel sheet, partially reducing it in a reducing zone and finishing the reduction immediately before its impregnation into a plating bath. CONSTITUTION:At the time of applying galvanization and a heating alloying treatment to a high strength steel sheet having 0.01 to 0.2% P content, at first, it is oxidized in an oxidizing zone in the atmosphere of 0.9 to 1.2 combustion air ratio to form an iron oxide film having several thousands Angstrom thickness on the steel sheet. Then, the steel sheet is reduced in a reducing zone so that 200 to 1000Angstrom thickness in iron oxide remains. Thereafter, reduction is executed by vapor contg. one or >= two kinds among Na, K, Ca, Mg and Mn and having high reducing properties immediately before plating, and the reduction of the iron oxide film is finished. The steel sheet is galvanized and heated and alloyed to obtain the objective high P-contg. high strength galvannealed steel sheet excellent in plating adhesion.

65. 发明专利

JPH0544005A PRODUCTION OF ALLOYED HOT DIP GALVANIZED STEEL SHEET HAVING EXCELLENT WORKABILITY 失效
公开(公告)号：JPH0544005A
公开(公告)日：1993-02-23
申请号：JP20181491
申请日：1991-08-12
申请人： NIPPON STEEL CORP
发明人： FUJII SHIRO , TAIRA TAKETOSHI
IPC分类号： C23C2/06 , C23C2/28 , C23C2/40
摘要： PURPOSE:To produce an alloyed hot dip galvanized steel sheet having excellent workability. CONSTITUTION:A steel sheet is hot dip galvanized with a molten Zn bath consisting of 0.005-0.2wt.% V, 0.05-0.20wt.% Al and the balance Zn with inevitable impurities in a Sendzimir hot dip galvanizing line and the hot dip galvanized steel sheet is alloyed by heating. An alloyed hot dip galvanized steel sheet having excellent workability can be produced.

66. 发明专利

JPH04361881A PRODUCTION OF ALUMINUM CLAD STEEL SHEET HAVING GOOD CORROSION RESISTANCE 失效
公开(公告)号：JPH04361881A
公开(公告)日：1992-12-15
申请号：JP13519591
申请日：1991-06-06
申请人： NIPPON STEEL CORP
发明人： NAKAMURA FUMIAKI , TAIRA TAKETOSHI , FUJII SHIRO
IPC分类号： B23K20/00 , B23K20/04 , B23K103/20 , C23C18/31 , C23C18/32
摘要： PURPOSE:To provide a process for production of the aluminum clad steel sheet having good corrosion resistance. CONSTITUTION:This process for production of the rolled and coated steel sheet having the good corrosion resistance consists of forming an iron plating layer on one surface of aluminum foil and press-welding this aluminum foil under heating to the steel sheet. A method of pickling one surface of the aluminum foil with a soln. sulfuric acid or hydrochloric acid and continuously forming the iron plating layer on the one surface of the aluminum foil with a sol. of sulfuric acid or hydrochloric acid contg. one or two kinds of iron chloride and iron sulfate is also included in the iron plating method of this time.

67. 发明专利

JPH04304346A PRODUCTION OF HIGH TENSILE STRENGTH GALVANNEALED STEEL SHEET EXCELLENT IN WORKABILITY 失效
公开(公告)号：JPH04304346A
公开(公告)日：1992-10-27
申请号：JP6853491
申请日：1991-04-01
申请人： NIPPON STEEL CORP
发明人： FUJII SHIRO , TAIRA TAKETOSHI
IPC分类号： C22C18/00 , C23C2/02 , C23C2/06 , C23C2/28
摘要： PURPOSE:To produce a high tensile strength galvannealed steel sheet excellent in workability. CONSTITUTION:In a method for producing a high tensile strength galvannealed steel sheet having 0.2-1.2% Si concentration in the steel, the high tensile strength galvannealed steel sheet excellent in workability can be produced by grinding the surface of a steel sheet to be plated by 0.1-5mum, applying plating to the steel sheet by the use of a hot-dip galvanizing bath having a composition consisting of 0.001-0.2wt.% Si, 0.05-0.20% Al, and the balance Zn with inevitable impurities, and then performing alloying treatment by heating.

68. 发明专利

JPH04274891A MANUFACTURE OF ZINC-ALUMINIUM TWO LAYER SURFACE TREATED STEEL SHEET 失效
公开(公告)号：JPH04274891A
公开(公告)日：1992-09-30
申请号：JP3402091
申请日：1991-02-28
申请人： NIPPON STEEL CORP
发明人： FUJII SHIRO , TAIRA TAKETOSHI , NAKAMURA FUMIAKI
IPC分类号： B23K20/00 , B23K20/04 , C22C21/00 , C23C2/06 , C23C2/28 , C25D5/26 , C25D5/50
摘要： PURPOSE:To offer a manufacture of a zinc-aluminium two layer surface treated steel sheet of film joining excellent in adhesive strength and corrosion resistance. CONSTITUTION:After at least one side of a zinc based plated steel sheet is joined with aluminium or aluminium based alloy film which is preliminary plated with a zinc based alloy on the side of the joining surface, the zinc- aluminium two layer surface treated steel sheet of film joining excellent in adhesive strength and corrosion resistance is obtained by heating up to above the eutectic temp. of zinc-aluminium.

69. 发明专利

JPH04191356A PRODUCTION OF ALLOYED GALVANIZED STEEL SHEET HAVING EXCELLENT SPOT WELDABILITY 失效
公开(公告)号：JPH04191356A
公开(公告)日：1992-07-09
申请号：JP32105590
申请日：1990-11-27
申请人： NIPPON STEEL CORP
发明人： NAKAMURA FUMIAKI , TAIRA TAKETOSHI , FUJII SHIRO
IPC分类号： C25D5/26 , C23C2/06 , C23C2/26 , C23C2/28 , C23C28/02 , C25D5/48
摘要： PURPOSE:To produce the alloyed galvanized steel sheet having excellent corrosion resistance, workability, surface coatability, and spot weldability by applying a Zn plating layer, Fe or Fe-Zn alloy plating layer and an antioxidant film on the surfaces of the steel sheet, then heating the steel sheet to alloy the plating layers. CONSTITUTION:A Zn plating layer is formed as a 1st layer at, for example, 3 to 40g/m deposition by an electroplating or hot dip coating method on the surfaces of the steel sheet 1. An Fe electroplating layer or Fe-Zn plating layer is formed as a 2nd layer likewise at 3 to 40g/m deposition thereon and finally, the antioxidant layer consisting of one or 2 kinds among compds. of alkaline metals and alkaline earth metals and oxides of B, Ge, Sn, Sb, Pb, Bi, V, etc., is applied as a 3rd layer at 0.01 to 0.5g/m deposition thereon. Such steel sheet is subjected to a heating treatment. The alloyed galvanized steel sheet which is formed with the plating layers consisting of the Fe phase 2 diffused with the Zn, the Zn layer 3 diffused with the Fe, the Zn plating layer, the Zn phase 4 diffused with the Fe, the Fe phase 5 diffused with the Zn, the Fe plating layer, and the antioxidant layer on the steel sheet surfaces is produced.

70. 发明专利

JPH03243796A PRODUCTION OF ORGANIC COMPOSITELY PLATED STEEL SHEET HAVING HIGH CORROSION RESISTANCE 失效
公开(公告)号：JPH03243796A
公开(公告)日：1991-10-30
申请号：JP3961890
申请日：1990-02-22
申请人： NIPPON STEEL CORP
发明人： FUJII SHIRO , SHINDO YOSHIO , TAIRA TAKETOSHI , SAITO KATSUSHI
IPC分类号： B32B15/08 , C23C22/30 , C25D11/38 , C25D13/20
摘要： PURPOSE:To produce a steel sheet which is excellent in both corrosion resistance in a bare state and corrosion resistance after coating by forming a chromate film by two-stage treatment due to a specified method on the surface of the steet sheet plated with Zn or Zn alloy, and furthermore, forming an organic film thereon. CONSTITUTION:The surface of a steel sheet plated with Zn or a steel sheet plated with Zn alloy such as Zn-Ni is firstly subjected to chromate treatment. In this case, electrolytic chromate treatment of 10 - 60 mg/m built-up amount of Cr is performed as a first stage. Thereafter, as a second stage, chromate treatment is performed by coating 1 - 50 mg/m build-up amount of Cr in a treatment bath wherein the degree of reduction of Cr is 0.5 - 5.0 at Cr /Cr and a silane coupling agent is incorporated at 0.5 - 20%. An organic film of epoxy resin, urethane resin and acrylic resin, etc., is formed on the chromate treatment layer due to the second stage at

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