Fe-12Cr-22Mn and Fe-12Cr-22Mn-2Co (High Damping Stainless Alloy HIDAS) were developed and applied for suppression of noise or vibration. Since these alloys have high strength (1400Mpa) as well as high damping capacity (10
20) due to/ interface, their direct replacements for the parts of machines were possible. In this respect, the applications were tried mainly to machineries and nanotechnologies. Those were bolt and nut, gear, bite shank, cutting tool of numerically controlled (NC) machine, brake and arm of hard disk drive (HDD) and others. In those applications, all data obtained showed better results compared with other materials. Cost down and quality control would be the remaining problems.