SYMPOSIA PAPER Published: 01 January 1997
STP16607S

Development of High Strength 12% Cr Ferritic Steel for Turbine Rotor Operating above 600‡C

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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.

Author Information

Tsuda, Y
Heavy Apparatus Engineering Laboratory, Toshiba Corp., Yokohama, Japan
Yamada, M
Heavy Apparatus Engineering Laboratory, Toshiba Corp., Yokohama, Japan
Ishii, R
Heavy Apparatus Engineering Laboratory, Toshiba Corp., Yokohama, Japan
Tanaka, Y
Muroran Laboratory, The Japan Steel Works, LTD., Muroran, Japan
Azuma, T
Muroran Laboratory, The Japan Steel Works, LTD., Muroran, Japan
Ikeda, Y
Muroran Plant, The Japan Steel Works, LTD., Muroran, Japan
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Details
Developed by Committee: A01
Pages: 267–279
DOI: 10.1520/STP16607S
ISBN-EB: 978-0-8031-5349-3
ISBN-13: 978-0-8031-2423-3