Patent ID: 7416616

Claim:
A non-heat treated steel for soft-nitriding characterized by consisting essentially of, by mass %, C: 0.30 to 0.45%, Si: 0.1 to 0.50%, Mn: 0.6 to 1.0%, Ti: 0.005 to 0.1%, Mo: 0.01 to 1.0%, N: 0.015 to 0.030%, and the balance Fe and impurities, wherein the content of Cr is up to 0.15% and the content of V is up to 0.02%, and also characterized by having a mixed microstructure of bainite and ferrite whose bainite fraction is 5 to 90% a or having a mixed microstructure of bainite, ferrite and pearlite whose bainite fraction is 5 to 90%.