In this study effects of cryogenic treatment on wear, hardness and mechanical properties of 1.2436 tool steel were studied. For this purpose two temperatures were used, -63 ?C as shallow cryogenic temperature and -185 ?C as deep cryogenic temperature. In this study effect of cryogenic temperature (shallow and deep), cryogenic time (holding at cryogenic temperature for 20 and 40 hours), stabilization (holding at room temperature for 1 week) and effect of austenizing temperature (grain size) on wear behavior, hardness and mechanical properties of 1.2436 was studied. Wear test was performed using pin on disk method. In this respect, 2 different loads 120 and 180 N and 3 different velocities 0.05, 0.1 and 0.2 m/s were examined. It was shown that cryogenic treatment decreases retained austenite and hence improves wear resistance and hardness. This improvement in deep cryogenic treatment is more compare with shallow cryogenic treatment. This could be due elimination of retained austenite as well as better carbide distribution. In longer holding times at cryogenic temperatures, more retained austenite was transformed to martensite and hence better wear behavior and more hardness was seen. By stabilizing at room temperatures more retained austenite was transform to martensite and better wear behavior and more hardness was reached. In samples which were austenized in different times an optimum austenizing time (20 min austenizing) is observed in which below that (10 min austenizing) austenite structure is not homogenized and beyond that (50 min austenizing) grains are so big that wear resistance decreases. Cryogenic treatment increases strength and decreases elongation in this steel, on the other hand, cryogenic treatment decreased toughness. In longer holding time at cryogenic temperatures, toughness decreases as a result of retained austenite decrease. Stabilization time at room temperatures decrease toughness as a result of retained austenite decrease.