| 摘要 |
The invention provides a Ni-Fe-based alloy which is preferable for a welding of a joint between different materials such as a steel material and a Ni-based alloy, and a rotor for a steam turbine which is manufactured by using the same. The invention employs a Ni-Fe-based alloy comprising Cr: 14 to 18 %, Al: 1.0 to 2.5 %, Mo + W: 2.5 to 5.0 %, C: 0.01 to 0.10 %, B: 0.001 to 0.03 %, and Fe: 15 to 20 %, in mass, in which the remaining portion is constructed by an unavoidable impurity and Ni, as a welding metal. As a result, it is possible to provide a rotor for a steam turbine which can hold down a reduction of a ductility and a toughness generated in the case of welding the different materials, and is excellent in a strength and the ductility. |
