Patent ID: 6635126
Filing Date: 2003-10-21
Classification: C21D,C22C,F16H

Abstract:
A steel alloy comprising, in combination:a) about 0.05 to about 0.24 weight percent carbon; b) about 15.0 to about 28.0 weight percent cobalt; c) about 1.5 to about 9.5 weight percent nickel; d) one or more additives selected from the group consisting of: 1) about 3.5 to about 9.0 weight percent chromium; 2) up to about 2.5 weight percent molybdenum; 3) up to 0.2 weight percent vanadium; e) and the balance, iron, said alloy having a case and a core, said case having a carbon content greater than said core, said alloy comprising a martensite phase and having a case hardness of at least about Rockwell 60 C.