Patent ID: 6464801
Filing Date: 2002-10-15
Classification: C21D,C22C,F16H

Abstract:
A class of steel alloys comprising, in combination:a case hardened mixture with a core composition of about 0.05 to about 0.25 weight percent carbon in combination with about 15 to 28 weight percent cobalt, about 1.5 to 9.5 weight percent nickel, and one or more additives selected from the group consisting of about 3.5 to 9 weight percent chromium, less than about 2.5 weight percent molybdenum, and less than about 0.2 weight percent vanadium and the balance iron, where the mixture is case hardened in the range of surface hardness greater than about 60 Rockwell C and wherein the case layer is at least about 0.7 millimeter in thickness.