Shimazu H.,Ibaraki University |
Konosu S.,Ibaraki University |
Tanaka Y.,Nippon Steel Techno Research |
Yuga M.,Jfe Holdings |
And 2 more authors.
Journal of Pressure Vessel Technology, Transactions of the ASME
This paper presents the results of the research activities of the subcommittee on hydrogen embrittlement of the Japan Pressure Vessel Research Council (JPVRC). The combined effect of temper embrittlement and hydrogen embrittlement in Cr-Mo steels is discussed. It has been recognized that Cr-Mo steels used widely in the refining and petrochemical industry are quite susceptible to temper embrittlement. Although the synergistic relation between temper embrittlement and hydrogen embrittlement is a matter of major concern, studies regarding this subject are rarely encountered. Task group VIII (TG8) of the JPVRC conducted fracture toughness tests for three kinds of 2.25Cr-1Mo steels and 2.25Cr-1Mo-0.3 V steel. These steels were prepared by subjecting them to normalizing, tempering, and postweld heat treatments (PWHTs) which simulated actual conditions. Some specimens were embrittled by step cooling (Socal-1 treatment). It was found that the threshold for hydrogen-induced fracture was lowered when the specimen was exposed to pressurized hydrogen gas (15 MPa) for 48 h at 450 C and there was no marked indication of the synergistic action concerning this embrittlement. © 2013 by ASME . Source
Kambara S.,Gifu University |
Makino E.,Sojitz Corporation |
Kojima H.,Mu Ltd. |
Moritomi H.,Gifu University
28th Annual International Pittsburgh Coal Conference 2011, PCC 2011
In pulverized coal combustion, the volatility of mercury and its compounds are emitted during combustion. In general, emissions of mercury from coal combustion sources are approximately 20-50% elemental mercury (Hg0) and 50-80% divalent mercury (HgII), which may be predominantly HgCl2. HgII is water-soluble and may be removed from the flue gas by wet FGDs and dry deposition close to combustion sources, while Hg0 is diffused in atmosphere because Hg0 has a high vapor pressure and low water-solubility. To reduce mercury levels in the environment and human exposure, the removal techniques are desired. The main objective of this work is to investigate the influence of oxidation and absorption conditions on mercury removal efficiency to establish effective measures for mercury removal. The wet scrubber employed in this study is a unique design having a static mixer stirring flue gas and solvent. In experiment, model gas mixtures (Hg0/O2/N2 system and Hg0/O 2/NO/N2 system) were prepared at room temperature. The model gases were oxidized by ozone generated by atmospheric plasma before treatments by the wet scrubber. Elemental mercury was converted to HgO by reaction with ozone at room temperature, and above 99% Hg0 removal was attained by the wet scrubber. Simultaneously, removal of NO was examined as a multipollutant control technology. Nitrogen oxide in the model gas was converted to NO2 by reaction with ozone, and about 90% NO removal was obtained by using the wet scrubber. Source
Mu Ltd. | Date: 2012-09-03
Provided is a medical device including a self-propelled capsule endoscope that is propelled through the inside of a body by vibration of a fin portion and a capsule controller that controls self-propulsion of the capsule endoscope from the outside of the body, the medical device being capable of precisely controlling the moving direction of the capsule endoscope easily. This medical device (
Mu Ltd. | Date: 2015-12-01
Self -propelling capsule endoscopes for medical use; medical apparatus and instruments for controlling self-propelling capsule endoscopes.
Mu Co. | Date: 1995-12-19
electric paper money counting devices.