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91. 发明专利

JPS558408A ONE SIDE HOT DIPPING METHOD OF STEEL PLATE 失效
公开(公告)号：JPS558408A
公开(公告)日：1980-01-22
申请号：JP7865978
申请日：1978-06-30
申请人： HITACHI LTD
发明人： ITOU MASAHIKO , MIDORIKAWA HEIHACHIROU , FURUYA YASUMASA , MINATO AKIRA , KUBO MITSURU
IPC分类号： C23C2/00 , C23C2/02
摘要： PURPOSE:To produce one-side plated steel plates by disposing a positive electrode near the plating surface of the steel plate and a negative electrode on the non-plating surface side, letting hydrocarbon gas burn imperfectly while applying voltage between both electrodes to let soot deposit on the non-plating surface and introducing the steel plate into a hot dipping bath. CONSTITUTION:A steel hoop 6 having been cold rolled is introduced into an oxidizing furnace 7, where deposits such as rolling oils are burnt away. Next, it is put into a reducing furnace 8 of the atmosphere of H2; 10%, N2; 90% to reduce the oxide film on the surfaces of the steel hoop 6. The steel plate 6 is then put into a masking chamber 9, where a DC voltage of 500V or higher is applied between the positive electrode 2 disposed by leaving a spacing of 1 to 50 mm on one side and the burner 3 being a negative electrode for causing acetylene gas or the like to burn imperfectly. Soot produced through incomplete combustion is evenly deposited on the steel hoop surface on the negative electrode side. This steel hoop is then introduced into a hot dipping bath 11 such as of Zn. The surface having been deposited with soot is not plated, thus the one-side plated steel hoop is readily obtained.

92. 发明专利

JPS54162632A ONEESIDE HOT DIPPING METHOD FOR STEEL SHEET 失效
公开(公告)号：JPS54162632A
公开(公告)日：1979-12-24
申请号：JP7086578
申请日：1978-06-14
申请人： HITACHI LTD
发明人： ITOU MASAHIKO , MIDORIKAWA HEIHACHIROU , MINATO AKIRA , KUBO MITSURU , KIMURA TOMOAKI
IPC分类号： C23C2/02
摘要： PURPOSE:To cheaply obtain a perfectly one-side hot dipped steel sheet by introducing a steel sheet into a hot dipping bath while contacting a side not to be hot dipped to C powder as a hot dipping preventive agent by a specified method. CONSTITUTION:Steel strip 1 is passed through degreasing vessel 2, washing vessel 3, sulfuric acid-washing vessel 4, washing vessel 5, hot stove 6, etc., and a side of degreased and washed strip 1 which side is not to be galvanized is coated with an aq. soln. of ZnCl2 and NH2Cl by means of roll coater 7 and dried at about 200 deg.C in drying furnace 8 of a N2 atmosphere. Strip 1 is then introduced into molten zinc bath 10 provided with 150 mm thick floating C powder 9 of an average diameter of 20 mum at non-galvanizing side. The galvanized strip is passed by roll 11 to regulate the amt. of molten zinc adhered, and attached C is removed with roll 12. In the bath a side not to be galvanized is covered with the C powder to prevent galvanizing, and a perfectly one-side galvanized steel sheet is cheaply obtd. without requiring complex pretreatment of a conventional method.

93. 发明专利

JPS5321021A SOLUTION TREATMENT METHOD FOR PIPE 失效
公开(公告)号：JPS5321021A
公开(公告)日：1978-02-27
申请号：JP9479876
申请日：1976-08-11
申请人： HITACHI LTD
发明人： SASADA YASUHIRO , SHIFUJI EIZOU , MINATO AKIRA , IMAI KATSUYUKI , ITOU HISAO
IPC分类号： C21D9/08 , C21D9/50
摘要： PURPOSE:To carry out the solution treatment while generating the compressive residual stress at the inner surface of the stainless steel pipe and to prevent the occurrence of the stress corrosion cracking, by heating the area sensitized by welding of the austenitic stainless steel pipe to the solution treatment temperature and then by quenching the inner surface of the pipe.

94. 发明专利

JPH068913B2 失效
公开(公告)号：JPH068913B2
公开(公告)日：1994-02-02
申请号：JP16212585
申请日：1985-07-24
申请人： HITACHI LTD
发明人： OOHASHI TAKEYA , PPONDA TAKU , FURUYA YASUMASA , KASHIMURA EIJI , MINATO AKIRA , OOSUMI KATSUMI , AIZAWA MOTOHIRO
IPC分类号： G21F9/00 , G21D1/00 , G21D3/08

95. 发明专利

JPH0254435B2 失效
公开(公告)号：JPH0254435B2
公开(公告)日：1990-11-21
申请号：JP8972482
申请日：1982-05-28
申请人： HITACHI LTD
发明人： SUZUKI KATSUMI , IZUMITANI MASAKYO , MINATO AKIRA , KANBAYASHI TAKESHI , OOSUMI KATSUMI
IPC分类号： C23F11/18 , C23F15/00 , F01K21/00 , F01K21/06 , G21D1/02

96. 发明专利

JPH0120238B2 失效
公开(公告)号：JPH0120238B2
公开(公告)日：1989-04-14
申请号：JP14315883
申请日：1983-08-05
申请人： HITACHI LTD
发明人： SHOJI SABURO , OONAKA NORYUKI , MINATO AKIRA , ITO HISAO , KIMURA TAKASHI , SAITO TAKASHI , SUMIDA NOBUO
IPC分类号： C23F15/00

97. 发明专利

JPS6296898A POWER PLANT 失效
公开(公告)号：JPS6296898A
公开(公告)日：1987-05-06
申请号：JP25175986
申请日：1986-10-24
申请人： HITACHI LTD
发明人： HONDA TAKU , MINATO AKIRA , IZUMITANI MASAKIYO , KASHIMURA EIJI , OSUMI KATSUMI
IPC分类号： G21D1/00 , C23F14/00 , C23F15/00 , F28F19/00 , G21D3/00

98. 发明专利

JPS6159163B2 失效
公开(公告)号：JPS6159163B2
公开(公告)日：1986-12-15
申请号：JP2559079
申请日：1979-03-07
申请人： HITACHI LTD
发明人： HONDA TAKU , MINATO AKIRA , IZUMITANI MASAKYO , TAMAMURA TATEO
IPC分类号： B01D35/06 , B03C1/034

99. 发明专利

JPS61186897A FEED WATER FACILITY FOR NUCLEAR REACTOR 失效
公开(公告)号：JPS61186897A
公开(公告)日：1986-08-20
申请号：JP2628085
申请日：1985-02-15
申请人： HITACHI LTD
发明人： IZUMITANI MASAKIYO , KAWAKAMI TOSHIO , MINATO AKIRA , OSUMI KATSUMI
IPC分类号： G21D3/08

100. 发明专利

JPS61147900A METHOD AND INSTALLATION FOR CONTINUOUS ELECTROPLATING OF STEEL STRIP 失效
公开(公告)号：JPS61147900A
公开(公告)日：1986-07-05
申请号：JP26936884
申请日：1984-12-20
申请人： HITACHI LTD
发明人： ITO MASAHIKO , MIDORIKAWA HEIHACHIRO , MINATO AKIRA , YAMAGUCHI TERUO
IPC分类号： C25D7/06 , C21D9/56 , C23C2/40 , C23F17/00 , C23G3/02 , C23G5/00 , C25D19/00
摘要： PURPOSE:To execute efficient continuous electroplating of a steel plate at a high speed and high productivity by executing simultaneously a high-temp. electrolytic cleaning treatment and annealing heat treatment of the steel strip in a gaseous phase and pickling and activating the steel strip after descaling and shape correction then subjecting the steel strip to electroplating. CONSTITUTION:The steel strip 1 is passed through an oxygen free furnace 9 via an inlet side installation 2 and a preheating furnace 8 of weak oxidizing property and is heated to the prescribed temp. The heated steel strip is degreased and cleaned by pyrolysis. The steel strip 1 is then passed through a reduction annealing furnace 10 in which a gaseous mixture atmosphere composed of N2 and H2 is maintained. The scale of the steel strip is reduced away and annealed in said furnace. Such strip is cooled to some extent in a cooling chamber 11 and is then passed through a zinc hot dipping cell 12 from which the strip is drawn into the atmosphere and is cooled by a forced air cooler 13. The strip 1 after cooling is treated with an aq. acid soln. in a surface treatment device 14, by which the strip is descaled. The descaled strip is subjected to washing 15 and drying 16, then to shape correction by a skin pass mill 17 and a tension leveler 18. The strip 1 is thereafter subjected to the surface activation by about 10% aq. sulfuric acid soln. in a pickling tank 19 and is continuously electroplated in a galvanizing tank 21 after washing 20.

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