1. 1) S. S. Zhong and C. S. Wang: Bearing Steels, Metallurgical Industry Press, Beijing, (2002), 9 (in Chinese).
2. 2) S. Hirohide: Bearing Steels, Metallurgical Industry Press, Beijing, (2003), 1 (in Chinese).
3. 3) Z. Q. Zhang and Y. L. Wang: Bearing, 2 (1998), 24 (in Chinese).
4. 4) Z. Q. Zhang, Y. Z. Liu and Z. Q. Fan: Trans. Mater. Heat Treat., 23 (2002), 57 (in Chinese).
5. 5) Y. Z. Liu and T. Jiang: Bearing, 9 (1994), 32 (in Chinese).