By R. Viswanathan
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46 ADVANCED HEAT RESISTANT ••...... c 90 c " CI) / 70 ~ 60 Q. / Q. c 40 o. c ,.. •.. 1 , GENERATION ;r '. •....... --<. m e ti) . •.. ,, ", STEELS 321H} 3QH' "" " •.. • ..... 0 , , 7 8 Fig. 12 Effect of (Ti + Nb)/C Ratio on Creep Rupture Strength of 18Cr-8NiNb Ti Steel The 20-25Cr series steels are superior to the IBCr-BNi series in resistance to high-temperature corrosion, but their creep strengths (except for Alloy 800H) are lower than those of the IBCr-8Ni series steels. Thus, if the creep strength of 20-2SCr series steels can be improved, they will become very useful boiler steels, particularly for high temperature steam conditions.
1969, 245, p. 2553. 3. A. J. : Electron Microscopy and the Strength of Crystals, Thomas and Washburn eds, Gordon and Breach, New York, 1963, p. 899. 4. K. Onel and J. 1 p. 573. 5. J. W. Martin and R. D. Doherty: Stability of Microstructure in Metallic Systems, Cambridge University Press, Cambridge, England, 1976. 6. J. 1 1969, 207, p. 872. 7. R. W. K. Honeycombe: Steels Microstructure and Properties, Edward Arnold, London, 1981. 8. F. B. Pickering: Physical Metallurgy and the Design of Steels, Applied Science Publishers, 1978.
INTRODUCTION Energy savings and environmental protection are regarded worldwide as highly important issues. Operators of thermal power plants are trying to address these requirements by decreasing fuel costs and C02 emissions through further improvements in efficiency. Such improvements can be achieved by elevating steam conditions to even higher ranges of temperature and pressure. The development of the modern ultra-supercritical power plant began in the early 1980s, and the world's first swing-load ultra-supercritical power plant with conditions of 566°C and 31 MPa started commercial operation in Japan in 1989.
Advanced heat resistant steels for power generation by R. Viswanathan