发明授权
- 专利标题： Steam turbine, rotor shaft thereof, and heat resisting steel
- 专利标题（中）： 蒸汽轮机，转子轴和耐热钢
-
申请号： US08780441申请日： 1997-01-08
-
公开(公告)号： US06224334B1公开(公告)日： 2001-05-01
- 发明人: Masao Siga , Yutaka Fukui , Mitsuo Kuriyama , Yoshimi Maeno , Masateru Suwa , Ryoichi Kaneko , Takeshi Onoda , Hidefumi Kajiwara , Yasuo Watanabe , Shintaro Takahashi , Toshimi Tan
- 申请人： Masao Siga , Yutaka Fukui , Mitsuo Kuriyama , Yoshimi Maeno , Masateru Suwa , Ryoichi Kaneko , Takeshi Onoda , Hidefumi Kajiwara , Yasuo Watanabe , Shintaro Takahashi , Toshimi Tan
- 优先权： JP1-023890 19890203; JP1-126622 19890522
- 主分类号： F01D528
- IPC分类号： F01D528
摘要：
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° 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.