发明名称 |
Steam turbine blade, method of manufacturing the same, steam turbine power generating plant and low pressure steam turbine |
摘要 |
There is provided a steam turbine blade made of Ti-base alloy comprising an alpha + beta type phase in which a difference of a tensile strength is small between a blade portion and a dovetail portion, a tensile strength at a room temperature of the dovetail portion is equal to or more than 100 kg/mm<2> and a suitable toughness is commonly provided together with a strength, as a steam turbine blade having a length of 43 inch or more, a method of manufacturing the same, a steam turbine power generating plant and a low pressure steam turbine. In the steam turbine blade having a blade portion and a plurality of fork type dovetails, wherein the blade is made of Ti-base alloy structured such that a length of the blade portion is equal to or more than 52 inches with respect to a rotational speed 3000 rpm of the blade or equal to or more than 43 inches with respect to the rotational speed 3600 rpm, and a tensile strength at a room temperature of the dovetail is equal to or more than 100 kg/mm<2>, preferably equal to or more than 110 kg/mm<2> and equal to or more than 96 % of the tensile strength at the room temperature of the blade portion. <IMAGE> |
申请公布号 |
EP0980961(A1) |
申请公布日期 |
2000.02.23 |
申请号 |
EP19990115499 |
申请日期 |
1999.08.05 |
申请人 |
HITACHI, LTD. |
发明人 |
DOI, HIROYUKI;KURIYAMA, MITSUO;NAKAMURA, SHIGEYOSHI;IMANO, SHINYA;ONODA, TAKESHI |
分类号 |
C22C14/00;C22C38/44;C22C38/46;C22C38/52;C22F1/00;C22F1/18;F01D5/28 |
主分类号 |
C22C14/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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