1. Carbonitriding at 700°C in atmospheres of ammonia and carbon-containing components (endogas or natural gas) makes it possible to obtain a high-quality carbonitride (oxycarbonitride) case containing 3-4% N in the dense zone and 0.5-1% in the porous zone 0.5-1.0% C, and up to 3.5% 0, an austenitic-martensitic sublayer containing 1.0-0.6% N and C and 0 at the level of the matrix, and a lower-lying layer of a solid solution of nitrogen in α-Fe. 2. Carbonitriding at 700°C promotes a significant increase in wear resistance of constructional steels. In this case the coefficient of sliding fraction in tests without lubricant was 0.20-0.23, the fatigue limit in bending increases by 1.7 times in comparison with the normalized condition, and the corrosion resistance increases by an average of 10 times. © 1992 Plenum Publishing Corporation.
