After Crl2MoV steel by cryogenic treatment, cryogenic treatment can make the precipitation hardening martensitic highly dispersed ultrafine carbide, followed by temperature 200 ℃ tempered, these ultrafine carbides can be transformed into carbides. Without cryogenic treatment martensite after tempering, only in some local regions have a small amount of carbide precipitates. Crl2MoV low-temperature chemical heat treatment method, while maintaining high hardness and high wear resistance on the basis of Crl2MoV steel, ion nitriding, gas nitrocarburizing, bath thiocyanate alloying commonly used low-temperature chemical heat diffusion layer adhesion resistance. Three kinds of low-temperature chemical heat diffusion layer significantly impact adhesion effect, especially in salt bath thiocyanuric permeation best. Crl2MoV stainless steel utensils tensile modulus by gas nitrocarburizing treatment, the service life of 30,000 or more, the same tool life than conventional quenching and tempering process more than 10 times. ?? Hardening process to improve die life up to 80 million times over, can be pre-hard steel quenched and tempered low and hard ways. Preheated quenching at 500-600 ℃ 2-4 hours and then at 850-880 ℃ holding a certain time (at least 2 hours), into the oil cooling to 50-100 ℃ oil cooled, quenched hardness of up to 50 -52HRC, in order to prevent the cracking temperature 200 ℃ tempered should be dealt with immediately, after tempering, the hardness can be maintained over 48HRC salt bath process vanadizing