| (19) |
 |
|
(11) |
EP 1 306 458 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
27.08.2003 Bulletin 2003/35 |
| (43) |
Date of publication A2: |
|
02.05.2003 Bulletin 2003/18 |
| (22) |
Date of filing: 24.10.2002 |
|
|
| (84) |
Designated Contracting States: |
|
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR |
|
Designated Extension States: |
|
AL LT LV MK RO SI |
| (30) |
Priority: |
25.10.2001 JP 2001328149
|
| (71) |
Applicant: Mitsubishi Heavy Industries, Ltd. |
|
Tokyo (JP) |
|
| (72) |
Inventors: |
|
- Kamada, Masatomo, Nagasaki Research & Devpt Center
Nagasaki-shi, Nagasaki-ken (JP)
- Saito, Masahiro, Nagasaki Research & Devpt Center
Nagasaki-shi, Nagasaki-ken (JP)
- Fujita, Akitsugu, Nagasaki Research & Devpt Center
Nagasaki-shi, Nagasaki-ken (JP)
- Takano, Yusaku, c/o Choryo Engineering Co., Ltd.
Nagasaki-shi, Nagasaki-ken (JP)
|
| (74) |
Representative: Henkel, Feiler, Hänzel |
|
Möhlstrasse 37
81675 München
81675 München (DE) |
|
| |
|
| (54) |
12Cr alloy steel for a turbine rotor |
(57) A turbine rotor material, that has sufficient corrosion resistance and stress corrosion
cracking resistance and appropriate strength and toughness in a good balance, and
a manufacturing method thereof are provided. The turbine rotor material is a 12Cr
alloy steel that contains: C of 0.01 to 0.10%, Si of 0.01 to 0.50%, Mn of 0.1 to 1.0%,
Cr of 9 to 13%, Ni of 2 to 7%, Mo of 0.3 to 3%, N of 0.01 to 0.10%, all in weight
percent, and remains of Fe and incidental impurities.