Age hardenable alloy with a unique combination of very high strength and good toughness

Year	Description
1996	Invention patented by Raymond M. Hemphill, David E. Wert, Paul M. Novotny, and Michael L. Schmidt on September 8th, 1996. Abstract: An age hardenable martensitic steel alloy having a unique combination of very high strength and good toughness consists essentially of, in weight percent, about C 0.21-0.34 Mn 0.20 max. Si 0.10 max. P 0.008 max. S 0.003 max. Cr 1.5-2.80 Mo 0.90-1.80 Ni 10-13 Co 14.0-22.0 Al 0.1 max. Ti 0.05 max. Ce 0.030 max. La 0.010 max. ______________________________________ the balance essentially iron. In addition, cerium and sulfur are balanced so that the ratio Ce/S is at least about 2 and not more than about 15. A small but effective amount of calcium can be present in place of some or all of the cerium and lanthanum.
Source: selected by the editor from original sources.

Invention: Age hardenable alloy with a unique combination of very high strength and good toughness