| 摘要 |
PURPOSE:To obtain a soft-nitriding steel having superior age hardenability by providing a specified composition consisting of C, Si, Mn, Cr, Al, V and Fe. CONSTITUTION:This soft-nitriding steel consists of, by weight, 0.05-0.25% C, <=1.5% Si, <=2% Mn, 0.3-3% Cr, 0.02-0.5% Al, V satisfying V/C>=0.2% and the balance Fe with impurities. The steel may further contain 0.01-0.5% Nb+Ta and other suitable alloying components. The steel has low hardness and shows high machinability and plastic workability such as forgeability in a state before soft-nitriding. When the steel is soft-nitrided, a favorable hardened surface layer is formed, and age hardening is caused to give parts having high strength core structure.
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