发明名称 |
Steam turbine, rotor shaft thereof, and heat resisting steel |
摘要 |
The present invention relates to a steam turbine comprising a rotor shaft integrating high and low pressure portions provided with blades at the final stage thereof having a length not less than 30 inches, wherein a steam temperature at first stage blades is 530 DEG C., a ratio (L/D) of a length (L) defined between bearings of the rotor shaft to a diameter (D) measured between the terminal ends of final stage blades is 1.4 to 2.3. This rotor shaft is composed of heat resisting steel containing by weight 0.15 to 0.4 % C, not more than 0.1 % Si, 0.05 to 0.25 % Mn, 1.5 to 2.5 % Ni, 0.8 to 2.5 % Cr, 0.8 to 2.5 % Mo and 0.15 to 0.35 % V and, further, the heat resisting steel may contain at least one of Nb, Ta, W, Ti, Al, Zr, B, Ca, and rare earth elements.
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申请公布号 |
US5624235(A) |
申请公布日期 |
1997.04.29 |
申请号 |
US19950530960 |
申请日期 |
1995.09.20 |
申请人 |
HITACHI, LTD. |
发明人 |
SIGA, MASAO;FUKUI, YUTAKA;KURIYAMA, MITSUO;MAENO, YOSHIMI;SUWA, MASATERU;KANEKO, RYOICHI;ONODA, TAKESHI;KAJIWARA, HIDEFUMI;WATANABE, YASUO;TAKAHASHI, SHINTARO;TAN, TOSHIMI |
分类号 |
C21D9/38;C22C38/44;C22C38/46;C22C38/48;F01D5/02;F01D5/06;F01D5/14;F01D5/28;(IPC1-7):C22C38/44 |
主分类号 |
C21D9/38 |
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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