Abstract
1. High-strength rapid-nitriding steels containing Al, V, Ti, Mo, Cr, and Ni were developed. A hardness of H50=1000–1500 can be obtained after nitriding of these steels at 660°. The nitriding time is five to eight times shorter than for steel 38KhMYuA to obtain the same case depth and hardness. 2. With 0.3% Mo and as much as 0.1% C the hardness of the case increases, and also the ductility and toughness. 3. Alloying with vanadium substantially increases the hardness and case depth. The change in the mechanical properties depends on the ratio of vanadium to carbon. The hardness is highest with V/C=10–20. Steel 10KhN4Yu4FA is recommended for machine parts operating under conditions of intensive wear without substantial load, and steel 30KhN4Yu4FA (V/C=2) for machine parts operating under heavy load. 4. Alloying of these steels with titanium is inexpedient, since it lowers the toughness of the steel and induces cracking of the nitrided case. 5. Lowering the aluminum content to 1–2% in steel with 2% V increases the toughness to 5.4 kg-m/cm2 and increases the case depth without substantially reducing the hardness.
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