Patent Number 45 Date of Patent 5 268 044 Dec 7 1993 54 HIGH STRENGTH HIGH FRACTURE TOUGHNESS ALLOY 75 Inventors
L. Luyckx et al. "Sulfide Shape Control in High Strength Low Alloy Steels" Metallurgical Transactions, vol. 1 (Dec. 1970) No. 3341. W. M. Garrison, Jr. "Ultrahigh Strength Steels for Aerospace Applications' JOM (May 1990) L. Luyckx et al. "Current Trends in the Use of Rare Earths in Steelmaking' Electric Furnace Proceedings, (1973) P. E. Waudby, "Rare Earth Additions to Steel' Inter national Metals Reviews, (1978) No. 2. Primary Examiner Deborah Yee Attorney, Agent, or Firm Dann, Dorfman, Herrell and Skiliman