| Autor: |
Ryuichi Ishii, Tsukasa Azuma, Yasumi Ikeda, Yoichi Tsuda, Yasuhiko Tanaka, Masayuki Yamada |
| Rok vydání: |
2009 |
| Předmět: |
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| DOI: |
10.1520/stp16607s |
| Popis: |
An advanced 12% chromium ferritic steel has been developed for the high-temperature rotors in improved fossil-fired power plants. The development of this steel is based on the experimental studies of various 12% chromium heat resistant steels. Effects of alloy elements on the creep rupture strength have been investigated and the 10Cr-1.8W-0.7Mo-V-3Co-Nb-B steel was selected to be a hopeful candidate. This revealed the creep rupture strength was higher than that of 10Cr-1Mo-1W-V-Nb rotor steel being used at 593°C. The producibility and properties of the new steel have been verified with the medium size trial forging manufactured from a 20 ton ingot. Although a few technical subjects are remaining, these are expected to be solved with the modification of the manufacturing process. This newly developed high strength 12 % chromium ferritic steel is expected to be applicable to high-temperature rotors operating at 630°C or above, and the significant improvement of thermal efficiencies would be obtained in fossil-fired power plants. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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