| 摘要 |
PROBLEM TO BE SOLVED: To produce non-heat treated soft-nitrided steel parts subjected to soft-nitriding treatment with refining treatment or normalizing treatment after hot working obviated and moreover having high fatigue strength, excellent bending characteristics and excellent wear resistance. SOLUTION: This non-heat treated soft-nitrided steel parts in which the contents of C, Si, Mn, P, Cr, Ti, V, N, Al, Pb, S and Ca lie in specified ranges and also satisfying the following inequalities of (1) to (3) can be produced by subjecting a slab to ordinary hot working and cutting and thereafter executing ordinary soft-nitriding treatment: Fnl=141.5(C%)-19.6(Mn%)+1,280(N %)+95.6%<=60... (1), Fn2=-103.8(C%)+59.1(Mn%)+850.4(N%)+360.9>=350... (2), and Fn3=13.4(C%)-3.45(Mn%)+112.7(N%)+13.2>=7... (3).
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