Mitsubishi Heavy Industries Limited

Mitsubishi Hitachi Power Systems, Ltd.

Takashi Shige

Takashi Nakano

Kenji Kawasaki

Shin Nishimoto

Yoshinori Tanaka

Kenichi Matsunaga

Yoshikuni Kadoya

Ryuichi Yamamoto

Kazuo Murakami

Yuichi Hirakawa

Tatsuaki Fujikawa

Shizuo Inoue

Ganji Abe

Koichi Ue

Etsuryo Kita

Tsuneo Mandai

Koji Takahashi

Toshio Yonezawa

Ikumasa Koshiro

Koji Fujimoto

Yoshiaki Fukunaga

Kimmitsu Maruyama

A turbine rotor has suitable strength and toughness without causing soaring manufacturing costs and prolonged manufacturing time. The turbine rotor is constructed by welding a rotor member for high temperature made of high Cr steel to a rotor member for low temperature made of low Cr steel. The high temperature rotor member is formed from high Cr steel of which the nitrogen content is 0.02% or higher by mass %. A filler material welds the high temperature rotor member and the low temperature rotor member together, and is a 9% Cr-based filler material of which the nitrogen content is 0.025% or lower by mass %.

Turbine rotor and manufacturing method of turbine rotor

A turbine rotor which is composed by connecting Ni-based alloy and heat resisting steel such as 12-Cr steel by welding to be able to ensure strength of welded parts and can be used under steam conditions of 700&#xb0; C. class and method of manufacturing the rotor are also provided. The rotor of the rotating machine into which working fluid of 650&#xb0; C. or higher is introduced, the rotor being composed of a plurality of members connected by welding such that material of each member is different in accordance with temperature of working fluid which flows contacting the members, wherein the first member(s) is formed from Ni-based alloy having mean linear expansion coefficient of 12.4&#xd7;10/&#xb0; C.&#x2dc;14.5&#xd7;10/&#xb0; C., preferably 14.0&#xd7;10/&#xb0; C. or smaller within a temperature range from a room temperature to 700&#xb0; C. and second member(s) is formed from high-chrome steels, and the rotor is composed such that the first member(s) formed from Ni-base alloy is located in a portion which contact to the working fluid of 650&#xb0; C. or higher.

Rotor of rotating machine and method of manufacturing the rotor

There are provided an Ni-based alloy high-chrome steel structure and its manufacturing method capable of joining Ni-based alloys and high-chrome steels by welding, and performing suitable heat treatment, thereby maintaining the strength in the joints. In a manufacturing method of a structure formed by joining together at least two first members formed from Ni-based alloys by welding, and joining a second member formed from high-chrome steels to a member where the first members have been joined together, the manufacturing method includes the steps: joining together the at least two first members formed from Ni-based alloys by welding; performing first-stage aging treatment on a welded joint between the first members, and then, joining the second member formed from high-chrome steels to the member where the first members have been joined together by welding; and then, performing second-stage aging treatment on the welded joint between the first members, and performing heat treatment after welding on a welded portion between the first members and the second member.

Ni-based alloy high-chrome steel structure and manufacturing method of the same

A primary lid is set in a top opening of a vessel body that contains radioactive substance, and closes the top opening. The peripheral edge portion of the primary lid is welded to the inner peripheral surface of the vessel body. As the primary lid is welded, steam in the vessel body is discharged to the outside through a discharge hole in the primary lid, and a shield gas is filled into or run through a space in the outer peripheral portion of the primary lid, so as to prevent the steam from flowing into the welding portion.

Closed vessel for radioactive substance, seal-welding method for closed vessel, and exhaust system used for seal-welding method

This invention relates to a spray coating powder material which, when applied to gas turbines using a crude low-quality fuel oil as fuel, has sufficiently higher corrosion resistance to sulfur, vanadium, sodium and other substances that accelerate corrosion in a high-temperature service environment, than conventional materials such as Ni-50 Cr and MCrAlY materials, as well as high-temperature components coated therewith. Specifically, this invention relates to a spray coating powder material comprising, on a weight percentage basis, greater than 45% and up to 60% of chromium, 5 to 15% of aluminum, 0.5 to 10% of zirconium, and the balance comprising cobalt or iron, or both, and incidental impurities, as well as high-temperature components coated therewith. This material can yield a sprayed coating having high corrosion resistance to sulfur, vanadium, sodium and other substances that accelerate corrosion in a high-temperature service environment.

Spray coating powder material and high-temperature components coated therewith

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Hyogo, Japan

Takashi Shige