Hitachi, Ltd.

Norio Yokoba

Takamitsu Nakazaki

Shinji Tanaka

Nobuyuki Iizuka

Yuji Yoshitomi

Takeshi Araya

Takao Funamoto

Kazuhiko Kumata

Kei Kobayashi

Masami Yada

Shota Iwakura

Toshimi Sato

A Co-base alloy including, by weight, 0.03-0.10% C, not more than 1.0% Si, not more than 1.0% Mn, 20-30% Cr, 15-23% Ni, 3-10% W, 5-10% Ta and 0.05-0.7% Zr, is used as a welding material. A gas turbine nozzle has a crack repaired with a multi-layer weld using the Co-base alloy and a gas turbine for power generation employs the nozzle.

Gas turbine nozzle, power generation gas turbine, co-base alloy and

A method of forming a non-circular pipe having a different sectional shape in the longitudinal direction thereof by bending a raw pipe while applying pressure to the inside of the raw pipe, wherein the circumference of a section of the raw pipe is substantially equalized to the circumference of a section, corresponding to the section of the raw pipe, of the non-circular pipe after formed.

Method and apparatus for forming a non-circular pipe

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Hitachi, Japan

Norio Yokoba