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Ni-based alloy for a forged part of a steam turbine, rotor blade of a steam turbine, stator blade of a steam turbine, screw member for a steam turbine, and pipe for a steam turbine

A nickel-based alloy, rotor blade technology, applied in the direction of blade support elements, engine elements, mechanical equipment, etc., can solve application problems, and achieve the effect of enhanced forgeability and weldability, excellent high temperature strength

Inactive Publication Date: 2010-09-01
KK TOSHIBA
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Problems solved by technology

[0014] As mentioned above, although nickel-based alloys are considered to be used as materials for turbine rotors of steam turbines in the temperature range exceeding 700°C, for nickel-based alloys, the high-temperature strength is not sufficient for application under such high-temperature conditions

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  • Ni-based alloy for a forged part of a steam turbine, rotor blade of a steam turbine, stator blade of a steam turbine, screw member for a steam turbine, and pipe for a steam turbine
  • Ni-based alloy for a forged part of a steam turbine, rotor blade of a steam turbine, stator blade of a steam turbine, screw member for a steam turbine, and pipe for a steam turbine

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Embodiment Construction

[0024] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[0025] A nickel-based alloy of a forged part of a steam turbine having excellent high-temperature strength, forgeability, and weldability according to an embodiment of the present invention has the following composition. The symbol "%" herein means "% by weight", unless otherwise specified.

[0026] (M1) C: 0.01% to 0.15%, Cr: 18% to 28%, Co: 10% to 15%, Mo: 8% to 12%, Al: 1.5% to 2%, Ti: 0.1% to 3% , B: 0.001% to 0.006%, Ta: 0.1% to 0.7%, and the remainder thereof is Ni and unavoidable impurities.

[0027] (M2) C: 0.01% to 0.15%, Cr: 18% to 28%, Co: 10% to 15%, Mo: 8% to 12%, Al: 1.5% to 2%, Ti: 0.1% to 3% , B: 0.001% to 0.006%, Nb: 0.1% to 0.4%, and the remainder thereof is Ni and unavoidable impurities.

[0028] (M3) C: 0.01% to 0.15%, Cr: 18% to 28%, Co: 10% to 15%, Mo: 8% to 12%, Al: 1.5% to 2%, Ti: 0.1% to 3% , B: 0.001% to 0.006%, Ta+2Nb: 0.1% to 0.7%...

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Abstract

A Ni-based alloy for a forged part of a steam turbine having excellent high temperature strength, forgedability and weldability includes, in percentage by mass, 0.01 to 0.15 of C, 18 to 28 of Cr, 10 to 15 of Co, 8 to 12 of Mo, 1.5 to 2 of Al, 0.1 to 3 of Ti, 0.001 to 0.006 of B, 0.1 to 0.7 of Ta, and the balance of Ni plus unavoidable impurities.

Description

[0001] Cross References to Related Applications [0002] This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2008-328460 filed on December 24, 2008; the entire contents of which are hereby incorporated by reference. Background technique [0003] 1. Technical field [0004] The present invention relates to materials for the preparation of forged parts of steam turbines in which high temperature steam flows as a working fluid. Specifically, the present invention relates to a nickel-base alloy for a steam turbine forged part, a steam turbine rotor blade, a steam turbine stator blade, a steam turbine screw member, and a steam turbine tube having excellent high-temperature strength, forgeability, and weldability, which are Manufactured from nickel-based alloys used for forged parts of steam turbines. [0005] 2. Description of related technologies [0006] In thermoelectric equipment including steam turbines, from the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22C30/00F01D5/28
CPCC22C19/055
Inventor 根本邦义今井洁吉冈洋明山田政之宫下重和须贺威夫高桥武雄池田一隆
Owner KK TOSHIBA
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