1. (1) Takahashi, T., Sakakibara, M., Kikuchi, M., Araki, S., Ogawa, T., Nagao, K. and Fujita, T., Development of a High-Strength 25Ni-20Cr Steel for Tubes in Ultra-Supercritical Power Boilers, EPRI Second Int. Conf. on Improved Coal-Fired Power Plants, (1989), pp. 41_3-41_17.
2. (2) Suiryoku, Karyoku, Denkisetubi no Gijutsukijun no Kaisyaku, (Explanatory Technical Guide Book for Power Generation Plant in Japanese), (1997), Agency of Natural Resources and Energy under MITI.
3. (3) Orr, J. and Nileshwar, V. B., Esshete 1250: an Advanced Austenitic Stainless Steel for Power Station Tubes, Pipes and Headers, Stainless Steels '84, Göteborg, (1984), pp. 533-540.
4. (5) Data Sheets on the Elevated-Temperature Properties of 18Cr-12Ni-Nb Stainless Steel for Boiler and Heat Exchanger Seamless Tubes (SUS347HTB), NRIM Creep Date Sheet, No. 28A (1983).