Boronizing is the process of thermal adsorption and diffusion of atomic boron into a suitable metallic substrate to form spall-free metal boride(s) with elevated hardness and improved environmental resistance. Boronizing is common for ferrous alloys and infrequent for NiCrMo alloys. Unlike nitriding, boronizing is typically achieved at temperatures requiring parts to be post-heat treated, a characteristic that sometimes imposes part recertification needs to ascertain requirements. Alternatively, to better address NiCrMo alloy applications, boronizing needs to be made available up to alloy aging temperatures and still guarantee minimal requirements (e.g., >1500 HVN surface, >25 micronmeters case depth). In this investigation, five NiCrMo alloys (e.g., 935, 925, 718, 945, 625+) characterized by various nickel contents were selected and boronized using three distinct temperature schedules. Through this investigation, all NiCrMo test samples were evaluated using optical and scanning electron-microscopy, micro and nano-indentation, X-ray diffraction, and transmission-electron microscopy to develop a suitable boronizing process.