Abstract
1. The optimum content of vanadium in austenitic 0.4 C-4 Cr-18 Mn-V steel, guaranteeing the most desirable combination of strength and ductility characteristics upon aging, is 1.2–1.5%. 2. The primary mechanism of strengthening during the aging of this alloy is the precipitation of vanadium carbide, VC. The optimum aging temperature is 650°C. 3. The maximum level of strength attained upon aging rises with increasing quenching temperature from 1050 to 1175°C. 4. After quenching from 1100°C and after the optimum aging treatment at 650°C, the following properties are typically obtained: ultimate tensile strength, 100–110 kg/mm2; yield strength (0.2% offset), 75–80 kg/mm2; elongation, 35–45%; reduction in area, 40–50%.
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