Patent ID: 6491767
Filing Date: 2002-12-10
Classification: C21D,C22C,F16H

Abstract:
A die for forming metal alloy components comprising, in combination:a die form including a core and a surface form comprised of a steel alloy having a core hardness less than about 53 Rockwell C and a surface hardness of at least a portion of the surface greater than about 58 Rockwell C of the same steel alloy as the core said surface conditioned by a process selected from a group consisting of carburizing, nitriding, induction hardening and combinations thereof to a surface depth more than about 0.1 millimeter wherein the steel alloy comprises about 0.008 to 0.24 percent by weight carbon, about 15 to 28 percent by weight cobalt, about 1.5 to 9.8 percent by weight nickel and one or more additives selected from the group consisting of about 3.5 to 9.0 weight percent chromium, up to about 2.5 weight percent molybdenum and up to about 0.2 weight percent vanadium; and the balance iron.