1. 1) H. K. D. H. Bhadeshia: Steel Technology International, ed. by P. H. Scholes, Sterling, London, (1989), p. 289.
2. 2) H. Gondoh, H. Nahasugi, H. Matsudam, H. Tanehirom and H. Chino: Nippon Steel Tech. Rep., 14 (1979), 55.
3. 3) H. N. Lander, J. W. Morrow and A. P. Coldren: Steels for line pipe and pipe line fittings, Inst. of Metals, London, (1981), p. 136.
4. 4) C. M. Brown and D. B. McCutcheon: ibid., p. 156.
5. 5) T. Sawamura, T. Hashimoto, Y. Komizo and Y. Yamaguchi: Sumitomo Met., 37 (1985), 57.