Mutsuo Nakanishi
Sumitomo Metal Industries
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Publication
Featured researches published by Mutsuo Nakanishi.
Journal of Heat Treating | 1980
Seiichi Watanabe; Jun Furusawa; Mutsuo Nakanishi; Hiroo Ohtani
Strength and toughness of normalized and tempered 1 1/4Cr-1/2Mo steel plate decrease to a certain extent after stress relief annealing during fabrication. The addition of Al and small amounts of B increases the hardenability of 1 1/4Cr-1/2Mo steel for normalizing treatments and improves the strength and toughness so that enlargement of stress relief annealing condition up to 720°C × 50 h (temper parameter 21.5 × 103) is possible for plate thicknesses of 200 mm. The increase of hardenability during normalizing by a very slight amount of total boron is due to the redistribution of boron atoms during slow cooling. Such behavior of boron atoms is explained by the Gibbs absorption equation.
Journal of Materials for Energy Systems | 1982
Yoshinori Ito; Mutsuo Nakanishi; Yuichi Komizo
High strength line pipe steels require not only good low temperature toughness but also excellent weldability. The use of cellulose welding electrodes has introduced the possibility of cold cracking due to the introduction of hydrogen. This report deals with the cracking susceptibility of line pipe steels. Test results make it possible to establish a diagram to predict and determine the welding conditions for crackfree girth welds. This diagram contains an emperical parameter, Pw, which includes the alloying composition of the steel, the effective hydrogen concentration at the root of the weld, and the restraining stress. When Pw is plotted against the cooling time (the time to cool from the weld condition to 100 °C), a distinct separation is seen between cracked and crack-free weld joints. Thus, the Pw parameter has utility.It is found that crackfree girth welds can be made in line pipe steels if the equivalent carbon parameter is sufficiently low. References are given to pertinent literature from the International Institute of Welding (ILW).
Archive | 1989
Yoshihisa Ohashi; Mutsuo Nakanishi; Shigeharu Takai; Junichi Kikuchi; Tadashi Fukuda; Nobushige Hiraishi
Archive | 1989
Wataru Takahashi; Yoshihito Sugimoto; Mutsuo Nakanishi; Yoshiaki Shida; Minoru Okada
Archive | 1978
Masahiko Ikeda; Mutsuo Nakanishi; Norio Katsumoto
Archive | 1991
Wataru Takahashi; Yoshihito Sugimoto; Mutsuo Nakanishi; Yoshiaki Shida; Minoru Okada
Quarterly Journal of The Japan Welding Society | 1971
Yoshinori Ito; Mutsuo Nakanishi
Archive | 1985
Yasuto Fukada; Yuichi Komizo; Mutsuo Nakanishi
Archive | 1984
Takashi Matsuoka; Mutsuo Nakanishi; Seiichi Watanabe
Quarterly Journal of The Japan Welding Society | 1986
Mutsuo Nakanishi; Yu-ichi Komizo; Yasuto Fukada