US2010158682A1PendingUtilityA1

Ni-based alloy for a casting part of a steam turbine with excellent high temperature strength, castability and weldability, turbine casing of a steam turbine,valve casing of a steam turbine, nozzle box of a steam turbine, and pipe of a steam turbine

Assignee: TOSHIBA KKPriority: Dec 24, 2008Filed: Dec 8, 2009Published: Jun 24, 2010

Est. expiryDec 24, 2028(~2.4 yrs left)· nominal 20-yr term from priority

Inventors:Kuniyoshi Nemoto Kiyoshi Imai Yomei Yoshioka Masayuki Yamada Shigekazu Miyashita Takeo Suga Takeo Takahashi Kazutaka Ikeda

C22C 19/056C22C 19/055

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References

Claims

Abstract

A Ni-based alloy for a casting part of a steam turbine having excellent high temperature strength, castability 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.

Claims

exact text as granted — not AI-modified

1 . A Ni-based alloy for a casting part of a steam turbine having excellent high temperature strength, castability and weldability, comprising,
 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.   
   
   
       2 . The Ni-based alloy as set forth in  claim 1 ,
 wherein contents of at least Si and Mn selected from among the unavoidable impurities are set to 0.1 or less, respectively.   
   
   
       3 . A Ni-based alloy for a casting part of a steam turbine having excellent high temperature strength, castability and weldability, comprising,
 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 0.4 of Nb, and the balance of Ni plus unavoidable impurities.   
   
   
       4 . The Ni-based alloy as set forth in  claim 3 ,
 wherein contents of at least Si and Mn selected from among the unavoidable impurities are set to 0.1 or less, respectively.   
   
   
       5 . A Ni-based alloy for a casting part of a steam turbine having excellent high temperature strength, castability and weldability, comprising,
 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+2 Nb (Ta:Nb in mole ratio is 1:2), and the balance of Ni plus unavoidable impurities.   
   
   
       6 . The Ni-based alloy as set forth in  claim 5 ,
 wherein contents of at least Si and Mn selected from among the unavoidable impurities are set to 0.1 or less, respectively.   
   
   
       7 . A turbine casing of a steam turbine, comprising,
 at least a portion made of a Ni-based alloy as set forth in  claim 1  through casting.   
   
   
       8 . A turbine casing of a steam turbine, comprising,
 at least a portion made of a Ni-based alloy as set forth in  claim 3  through casting.   
   
   
       9 . A turbine casing of a steam turbine, comprising,
 at least a portion made of a Ni-based alloy as set forth in  claim 5  through casting.   
   
   
       10 . A valve casing of a steam turbine, comprising,
 at least a portion made of a Ni-based alloy as set forth in  claim 1  through casting.   
   
   
       11 . A valve casing of a steam turbine, comprising,
 at least a portion made of a Ni-based alloy as set forth in  claim 3  through valve casing.   
   
   
       12 . A valve casing of a steam turbine, comprising,
 at least a portion made of a Ni-based alloy as set forth in  claim 5  through casting.   
   
   
       13 . A nozzle box of a steam turbine, comprising,
 at least a portion made of a Ni-based alloy as set forth in  claim 1  through casting.   
   
   
       14 . A nozzle box of a steam turbine, comprising,
 at least a portion made of a Ni-based alloy as set forth in  claim 3  through casting.   
   
   
       15 . A nozzle box of a steam turbine, comprising,
 at least a portion made of a Ni-based alloy as set forth in  claim 5  through casting.   
   
   
       16 . A pipe for a steam turbine, comprising,
 at least a portion made of a Ni-based alloy as set forth in  claim 1  through casting.   
   
   
       17 . A pipe for a steam turbine, comprising,
 at least a portion made of a Ni-based alloy as set forth in  claim 3  through casting.   
   
   
       18 . A pipe for a steam turbine, comprising,
 at least a portion made of a Ni-based alloy as set forth in  claim 5  through casting.

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