Kabushiki Kaisha Toshiba

The Japan Steel Works, Ltd.

Toshiba Energy Systems & Solutions Corporation

Kenichi Okuno

Masayuki Yamada

Itaru Murakami

Reki Takaku

Kenichi Imai

Kazuhiro Miki

Tsukasa Azuma

Satoru Ohsaki

Haruki Ohnishi

Kazuhiro Saito

Atsushi Inoue

Osamu Watanabe

Toshio Suzuki

Takeo Takahashi

Shigeru Suzuki

Makoto Takahashi

Takeo Suga

Yoshifumi Iwasaki

Kiyoshi Imai

Yomei Yoshioka

Toshio Hirano

Shinji Tanaka

Shigekazu Miyashita

Sakae Kawasaki

Shinichiro Ohashi

Kuniyoshi Nemoto

Tetsuya Yamanaka

Yoriharu Murata

Akihiro Taniguchi

Koji Kajikawa

Ryou Oda

Liang Yan

Joji Kaneko

Akihiro Takakuwa

According to an embodiment, a rotor blade cover section is integrated with the rotor blades at leading ends thereof. A plurality of sealing fins is disposed at the rotor blade cover section, the sealing fins forming a predetermined clearance relative to an inner peripheral portion of the nozzle outer ring. An annular solid particle trapping space is disposed at the inner peripheral portion of the nozzle outer ring, the solid particle trapping space communicating with an inlet of a steam leak and trapping solid particles that flow in with steam. In the sealing structure, the nozzle outer ring has a through hole through which the solid particles are to be discharged from the solid particle trapping space toward a downstream stage of the steam turbine.

Sealing structure in steam turbine

A heat resistant cast steel containing, in mass %, C: 0.05-0.15, Si: 0.03-0.2, Mn: 0.1-1.5, Ni: 0.1-1, Cr: 8-10.5, Mo: 0.2-1.5, V: 0.1-0.3, Co: 0.1-5, W: 0.1-5, N: 0.005-0.03, Nb: 0.01-0.2, B: 0.002-0.015, Ti: 0.01-0.1, Fe and unavoidable impurities. A method for manufacturing a heat resistant cast steel, the method including melting raw materials to obtain a molten metal, refining and degassing the molten metal, pouring the molten metal into a predetermined mold to form a shape, performing an annealing treatment at a temperature of 1000 to 1150&#xb0; C., performing a normalizing treatment at a temperature of 1000 to 1200&#xb0; C., performing a first stage tempering treatment at a temperature of 500 to 700&#xb0; C., and performing a second stage tempering treatment at a temperature of 700 to 780&#xb0; C.

Heat resistant cast steel, manufacturing method thereof, cast parts of steam turbine, and manufacturing method of cast parts of steam turbine

A low alloy steel ingot contains from 0.15 to 0.30% of C, from 0.03 to 0.2% of Si, from 0.5 to 2.0% of Mn, from 0.1 to 1.3% of Ni, from 1.5 to 3.5% of Cr, from 0.1 to 1.0% of Mo, and more than 0.15 to 0.35% of V, and optionally Ni, with a balance being Fe and unavoidable impurities. Performing quality heat treatment including a quenching step and a tempering step to the low alloy steel ingot to obtain a material, which has a grain size number of from 3 to 7 and is free from pro-eutectoid ferrite in a metallographic structure thereof, and which has a tensile strength of from 760 to 860 MPa and a fracture appearance transition temperature of not higher than 40&#xb0; C.

Low alloy steel for geothermal power generation turbine rotor, and low alloy material for geothermal power generation turbine rotor and method for manufacturing the same

A forging heat resistant steel of an embodiment contains in percent by mass C: 0.05-0.2, Si: 0.01-0.1, Mn: 0.01-0.15, Ni: 0.05-1, Cr: 8 or more and less than 10, Mo: 0.05-1, V: 0.05-0.3, Co: 1-5, W: 1-2.2, N: 0.01 or more and less than 0.015, Nb: 0.01-0.15, B: 0.003-0.03, and a remainder comprising Fe and unavoidable impurities.

Forging heat resistant steel, manufacturing method thereof, forged parts and manufacturing method thereof

An Ni-base alloy for a turbine rotor of a steam turbine contains in percent by weight C: 0.01 to 0.15, Cr: 15 to 28, Co: 10 to 15, Mo: 8 to 12, Al: 1.5 to 2, Ti: 0.1 to 0.6, B: 0.001 to 0.006, Re: 0.5 to 3, and the balance of Ni and unavoidable impurities.

Ni-base alloy for turbine rotor of steam turbine and turbine rotor of steam turbine

A turbine rotor blade according to the present invention includes a cover provided at the top of an effective blade portion and a blade-fitting portion provided at the bottom of the effective blade portion. A turbine wheel is provided with a turbine-wheel engagement portion to which the blade-fitting portion is fittable. The turbine rotor blade is a portion of a blade array structure formed by arranging the cover and a neighboring cover in contact with each other. The blade-fitting portion is provided with an anti-twist segment, and the turbine-wheel engagement portion is provided with an untwist restraining segment engageable to the anti-twist segment.

Turbine rotor blade, turbine rotor and steam turbine equipped with the same

The moving blades are configured so as to meet a condition: (L&plus;3D)&times;f&gE;14,500 or L&times;(L&plus;D)&times;f &gE;1.55&times;10 , where L is an effective length of the moving blade measured in inches, D is a blade root circle diameter of the moving blades measured in inches, and f is the rated operating speed of the turbine measured in Hz. The moving blades are formed of a titanium alloy. The dovetail has an Christmas-tree shape, and is a curved-axial-entry. The moving blades are configured and arranged so as to meet a condition: 3.5&lE;P/W&lE;7.0 or 0.8&lE;P/C&lE;1.0, where W is a width of a section of a tip of the moving blade measured along an axis of the rotor wheel, P is pitch of the moving blades, and C is a chord length of the tip section of the moving blade. Adjacent moving blades are connected to each other in such a manner that the adjacent moving blades being capable of relative movement while the adjacent moving blades being connected to each other.

Moving blades for steam turbine

A moving turbine blade apparatus has a plurality of moving blades ( ) adapted to be mounted on a rotor shaft, a plurality of snubber covers ( ) formed on outer ends of the moving blades ( ), respectively, so as to be arranged successively in a circle having its center on the axis of the rotor shaft, and a plurality of ribs ( ) projecting from outer surfaces of the snubber covers ( ), respectively, so as to extend in a circle having its center on the axis of the rotor shaft. At least one of the opposite end portions of the rib ( ) has a thickness measured in a direction of the axis of the rotor shaft greater than that of a middle portion of the same rib ( ). Steam loss attributable to the leakage of steam through gaps around the outer ends of the moving blades ( ) is reduced.

Moving turbine blade apparatus

A blade for an axial fluid machine comprises an effective blade portion having a root portion and a tip portion and projecting blade portions. The projecting blade portions are defined by axis reference lines extending to an upstream side with respect to a fluid flow from at least one of the root portion and the tip portion of the effective blade portion and by axes obliquely extending from ends of the axis reference lines toward a leading edge of the effective blade portion. The projecting blade portions are formed continuously to and integrally with the leading edge of the effective blade portion so that the effective blade portion and the projecting blade portions have substantially the same maximum blade thickness.

Blade for axial fluid machine having projecting portion at the tip and

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Yokohama, Japan

Kenichi Okuno