Patent ID: 8753457
Filing Date: 2014-06-17
Classification: B22F,B32B,C22C,C23C

Abstract:
1. A process for nitriding martensitic stainless steels comprising: a. heating martensitic stainless steels to a temperature of from about 900° F. (480° C.) to about 2500° F. (1370° C.) in a vacuum furnace in the presence of hydrogen or argon gas in order to clean the surface thereof; b. subsequently removing the hydrogen or argon gas from said furnace; c. injecting nitrogen (N d. nitrating said steel at a temperature of from about 1400° F. (760° C.) to about 2200° F. (1205° C.); e. quenching said steel, and, f. raising the temperature of the chamber in said furnace a second time from about 900° F. (480° C.) to about 2500° F. (1370° C.) prior to cooling the final product.