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Koichi Akutsu

Syuzo Ueda

Masaaki Ishikawa

Masakiyo Izumiya

Fumio Hataya

Yui Kusuhara

Yoshikuni Ohshima

Iwao Shiraishi

A novel low C-Cr-Mo steel having an excellent weldability and a high erosion-corrosion resistance under wet steam, which consists of, in % by weight, 0.02-0.14% of C, not more than 0.90% of Si, 0.30-0.80% of Mn, 0.70-1.60% of Cr, 0.40-0.70% of Mo and the remainder being substantially Fe. This novel steel is a very excellent material for fabricating the portions in the feed-water heater, for example, for a nuclear power generation plant, the portions being used under wet steam condition. The above described weldability and erosion-corrosion resistance can be improved by additionally adding the second components of Cu, N, or B, the third components of Nb or V or the fourth components of Al, Ti or Zr in the respectively defined amounts.

Low C-Cr-Mo steel used under wet steam

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Ibaragi pref., Japan

Koichi Akutsu