1. Smithells metals reference book,1992
2. Properties and selection: irons, steels, and high performance alloys. In: Metals Handbook. 1, 10th ed. ASM, 1990
3. D2 and M2 Specification Sheets, Aurora Steels, Oldbury, Warley, B69 4UD, 1995
4. Roberts G, Krauss G, Kennedy R. Tool steels. 5th ed. ASM, 1997
5. The surface engineering handbook;Austin,1998