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Ioka, Ikuo; Suzuki, Jun; Maruyama, Nobutoshi*; Kiuchi, Kiyoshi; Nakayama, Jumpei
no journal, ,
Optimization of composition for high Cr-W-Si Ni base alloy has been studied to apply to a nitric acid with high oxidation-reduction potential of advanced reprocessing plants. The corrosion resistance of the Ni base alloy is superior to that of conventional stainless steels. In addition, The Ni base alloy has an excellent resistance of weld crack and ability of plastic deformation caused by extra high purity (EHP) refining technology. However, the Ni base alloy has a technical limitation in hot working and welding for practical use. Several Ni base EHP alloys with different content of Si and W were manufactured to choose an optimum composition range without losing corrosion resistance. High strain rate tensile tests at high temperature, corrosion tests and weldability tests were carried out to examine the optimum composition range of Ni base EHP alloy.
Ioka, Ikuo; Yonekawa, Kazuo; Maruyama, Nobutoshi*; Kiuchi, Kiyoshi; Nakayama, Jumpei
no journal, ,
Nb-W binary alloy which is superior to current zirconium for corrosion and cracking in severer environment is developed for advanced reprocessing plants. Ductility of Nb-W binary alloy is improved by an application of extra high purity (EHP) refining technology, but mechanical strength deteriorates. A ductile-brittle transition temperature (DBTT) of Nb-W binary alloy rises, though the increase in W improves mechanical strength. DBTT of the weld tends to be high in comparison with the base metal, and a rise of DBTT by increase in W becomes the problem. Nb-W EHP alloys with different content of W were manufactured to choose an optimum composition range. Tensile, corrosion and Charpy impact tests were carried out to examine the optimum composition range of Nb-W EHP alloy.
木内 清; 井岡 郁夫; 加藤 千明; 丸山 信俊
中山 準平*; 塚谷 一郎*; 田邊 誠*
JP, 2008-115964 
Patent licensing information Patent publication (In Japanese)
【課題】高酸性イオンを含む高濃度硝酸溶液の沸騰伝熱面腐食環境下、又は、中性子照射を受ける高温高圧水中環境下における、粒界腐食及び応力腐食割れに対して優れた耐食性を呈するオーステナイト系ステンレス鋼およびその製造方法を提供する。 【解決手段】C:0.005WT%以下、SI:0.5WT%以下、MN:0.5WT%以下、P:0.005WT%以下、S:0.005WT%以下、NI:15.0~40.0WT%、CR:20.0~30.0WT%、N:0.01WT%以下、O:0.01WT%以下を含有し、残部はFEおよび不可避的不純物とする。不可避的不純物に含まれるBを3WTPPM以下になるようにする。