专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JPH1046291A HEAT TREATMENT FOR DUAL PHASE STAINLESS STEEL 失效
公开(公告)号：JPH1046291A
公开(公告)日：1998-02-17
申请号：JP20341696
申请日：1996-08-01
申请人： HITACHI LTD , HITACHI NUCLEAR ENG
发明人： ANDO MASASHI , YOSHIDA SUMI , YAMAGUCHI SHINGO
IPC分类号： C21D6/00 , C22C38/00 , C22C38/44
摘要： PROBLEM TO BE SOLVED: To improve resistance to seawater pitting corrosion and crevice corrosion by specifying the composition of elements and applying specific heat treatment. SOLUTION: A casting is used for a suction 1, an impeller 2, and a bearing 4, and its material has a chemical composition consisting of, by weight,

2. 发明专利

JPH07128475A CONTROL ROD DRIVE MECHANISM FOR NUCLEAR POWER PLANT 失效
公开(公告)号：JPH07128475A
公开(公告)日：1995-05-19
申请号：JP27643393
申请日：1993-11-05
申请人： HITACHI LTD
发明人： ANDO MASASHI , KOSHIISHI MASATO , SHIRAKI TOMOMI , MIYAZAKI KUNIO
IPC分类号： G21C7/12
摘要： PURPOSE:To obtain a drive mechanism superior in antifriction equivalent to cobalt-based alloy by using a specific alloy without containing cobalt for a guide roller/ a pin for guide mounted on the drive mechanism and a spindle head. CONSTITUTION:In a pin 23/ a roller 22 for guide mounted on the mechanism, the pin 23 is fixed with a rotation stopper of a fixed part 21 through the roller 22. The outer circumferential part of the pin 23 is slid, with friction with the inner circumferential part of the roller 22, in addition, the outer circumferential part of the roller 22, a hollow piston, a ball screw shaft and the like are brought into contact with each other and slid. And wear resistance is possessed by using Ni-Cr-B-Si-Fe-W system Ni-based alloy for the roller 22 and Fe-Cr-Ni-Si- Mn system Fe-based alloy for the pin 23. Furthermore, in combination of a shaft and a bushing in a spindle head, Ni-Cr-B-Si--Fe-W system Ni-based alloy is used for the bushing and Fe-Cr-Ni-Si-Mn system Fe alloy for the shaft.

3. 发明专利

JPH0699131A EXECUTION CONTROL OF PAINT 失效
公开(公告)号：JPH0699131A
公开(公告)日：1994-04-12
申请号：JP25291792
申请日：1992-09-22
申请人： HITACHI LTD
发明人： NAGATA TETSUYA , ANDO MASASHI
IPC分类号： B05D1/36 , B05D3/00 , B05D7/14
摘要： PURPOSE:To prevent the remaining of a solvent in a film and to aim at the perfectness of painting by applying painting to a test piece under the same conditions as the painting to an object to be painted to confirm the hardness of the film on the test piece and further ageing the painted test piece when curing is insufficient before entering the painting work of the next process. CONSTITUTION:In a heavy corrosion-proof painting system, an inorg. or org. zinc rich primer layer 2 is applied to an object 1 to be painted as the lowermost layer and a mixed coat layer 3 and first and second topcoat layers 4, 5 are successively applied on the primer layer using paint such as epoxy paint, polyvinyl chloride paint or polyurethane paint. In this paint execution control method, a test piece other than the object 1 to be painted is prepared and painting is applied to the test piece under the same conditions as the painting to the object 1 to be painted to confirm the hardness of the film on the test piece and, when curing is insufficient, the painted test piece is further aged before the painting work of the next process is performed. Since the hardness of the test piece painted under the same conditions is measured, painting can be applied to the object 1 to be painted without damaging the object.

4. 发明专利

JPH07218689A OPERATION METHOD OF BOILING WATER REACTOR POWER PLANT AND BOILING WATER REACTOR POWER PLANT 失效
公开(公告)号：JPH07218689A
公开(公告)日：1995-08-18
申请号：JP1256994
申请日：1994-02-04
申请人： HITACHI LTD
发明人： YAMANE KOICHI , AKAMINE KAZUHIKO , ASAKURA YAMATO , OSUMI KATSUMI , HATTORI SHIGEO , ANDO MASASHI
IPC分类号： G21D1/00 , G21D3/08
摘要： PURPOSE:To exactly control the effective oxygen concentration at reactor bottom by using the conventional sampling line with easy maintenance of monitor reliability and component in the process of suppressing SCC(stress corrosion cracking) of reactor bottom material by hydrogen injection. CONSTITUTION:The correlation between the effective oxygen concentration in reactor recirculation system and that in the reactor bottom is developed in advance and it is set in a controller 12. When the effective oxygen concentration in reactor recirculation system 51 is measured with an oxygen monitor 11 and its signal is input to the controller 12, the controller 12 calculates the effective oxygen concentration in the reactor bottom based on the correlation and controls the opening of a control valve 36 to control the injection hydrogen amount from a hydrogen injection equipment 55 to a water supply system 50. By this, the effective oxygen concentration in the reactor bottom is controlled within a specified range.

5. 发明专利

JPH0792292A METHOD AND APPARATUS FOR MONITORING AND DIAGNOSING SOUNDNESS OF PLANT EQUIPMENT, METHOD AND APPARATUS FOR DECIDING MAINTENANCE AND INSPECTION TIME OF PLANT EQUIPMENT, AND NUCLEAR POWER PLANT 失效
公开(公告)号：JPH0792292A
公开(公告)日：1995-04-07
申请号：JP23496193
申请日：1993-09-21
申请人： HITACHI LTD
发明人： KATO TAKAHIKO , ANDO MASASHI , OSUMI KATSUMI , HORIUCHI TETSUO , ASAKURA YAMATO , AKAMINE KAZUHIKO
IPC分类号： G01N27/06 , C02F1/00 , G08B31/00 , G21C17/003 , G21C17/02
摘要： PURPOSE:To precisely estimate the occurrence time of the trouble of a plant equipment coming into contact with circulating water in a nuclear power plant or the like and to execute the maintenance and inspection of the plant equipment so as to match the planned shut-down time (the periodic inspection time) of a plant before the trouble of the plant equipment occurs while the maximum sound usage period of the plant apparatus is being grasped and held. CONSTITUTION:Change in a water quality inside a recirculation pump 114 due to the corrosion by a circulating water, which is caused in a constituent component for the pump is measured by a conductivity meter 42 or a pH meter. The time elapsed until the change in the quality after the start of the use of the pump is computed, the time is compared with the correlation between the trouble occurrence time which has been prepared in advance and the time elapsed until the change in the water quality is caused, and the occurrence time of the trouble is estimated. In addition, when the estimated occurrence time of the trouble exists between the nth periodic inspection and the (n+1)th periodic inspection of the plant, the time of the nth periodic inspection is set as the maintenance inspection time of the plant equipment.

6. 发明专利

JPH10170693A CORROSION CRACKING RESISTANCE IMPROVING METHOD OF NUCLEAR REACTOR PIPING 失效
公开(公告)号：JPH10170693A
公开(公告)日：1998-06-26
申请号：JP33333896
申请日：1996-12-13
申请人： HITACHI LTD
发明人： URAYAMA YOSHINAO , KUNIYA JIRO , ANDO MASASHI
IPC分类号： G21D1/00
摘要： PROBLEM TO BE SOLVED: To improve corrosion cracking resistance of carbon steel piping, carbon steel welded piping and an apparatus by completely removing cooling water stagnating in the piping after operation of a nuclear reactor is stopped. SOLUTION: Even if drain processing of a coolant is performed after operation is stopped, cooling water stagnates in piping by a part. A method of sending a hot blast into a piping inside part, a method of heating a cooling water stagnating part by a heating coil from a pipe outside surface and a method of spraying a hot blast on the stagnating part from outside of a pipe, exist as a processing method of removing the cooling water. In a hot blast sending method, a hot blast of 200 to 300 deg.C not less than 50 deg.C is sent into at 500cc/sec or more. It is heated to 200 to 300 deg.C not less than 100 deg.C by the heating coil, and at hot blast spraying time, a temperature is set to the same temperature, and wind speed is set not less than 500cc/sec. It is effective when completely evaporated and removed by such heat treatment. Therefore, since a carbon steel apparatus and a carbon steel welded structure having excellent corrosion cracking resistance can be formed in a BWR reactor water environment, safety of a BWR is secured, and the service life of a nuclear power plant can be lengthened.

7. 发明专利

JPH06299233A HEAT TREATMENT METHOD FOR CARBON STEEL HAVING EXCELLENT STRESS CORROSION CRACK RESISTANCE TO HIGH TEMPERATURE AND HIGH PRESSURE WATER 失效
公开(公告)号：JPH06299233A
公开(公告)日：1994-10-25
申请号：JP8283393
申请日：1993-04-09
申请人： HITACHI LTD
发明人： URAYAMA YOSHINAO , KUNIYA JIRO , KOBAYASHI MASAHIRO , HATTORI SHIGEO , ANDO MASASHI
IPC分类号： B23K9/23 , B23K31/00 , C21D6/00 , C21D9/50
摘要： PURPOSE:To remove the residual stress of welding and to improve an SCC resistance to high temp. and high pressure water by setting quenching temp. and annealing temp. corresponding to C content in the used carbon steel and restraining a dilution ratio caused by dissolution at the time of welding. CONSTITUTION:Composition of the carbon steel is =6 crystal number to restrain the generation of pitting. For the primary layer of this carbon steel at the contacting side with the high temp. and high pressure water, the C content of the welded metal part is made lower than C content of the welded metal (welding rod) + welded metal carbon content X 0.6 and the welding of low heat input with dilution ratio of

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式