STEEL SHEET FOR SOFT NITRIDING AND PROCESS FOR PRODUCING SAME

To provide a steel sheet for soft-nitriding excellent in formability and strength stability after soft-nitriding. A steel sheet for soft-nitriding has a composition conteining: C: 0.05% or more to 0.10% or less; Si: 0.5% or less; Mn: 0.7% or more to 1.5% or less; P: 0.05% or less; S: 0.01% or less;...

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Bibliographische Detailangaben
Hauptverfasser: NAKAMURA,NOBUYUKI, MEGA,TETSUYA, KOBAYASHI,TAKASHI
Format: Patent
Sprache:eng ; fre ; ger
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Zusammenfassung:To provide a steel sheet for soft-nitriding excellent in formability and strength stability after soft-nitriding. A steel sheet for soft-nitriding has a composition conteining: C: 0.05% or more to 0.10% or less; Si: 0.5% or less; Mn: 0.7% or more to 1.5% or less; P: 0.05% or less; S: 0.01% or less; Al: 0.01% or more to 0.06% or less; Cr: 0.5% or more to 1.5% or less; Nb: 0.005% or more to 0.025% or less; and N: 0.005% or less, on a mass percent basis, such that C and Nb satisfy 0.10 ‰¤ Nb/C ‰¤ 0.30 (where C and Nb are respective contents of the elements (by mass%)), wherein balance comprises Fe and incidental impurities, and a microstructure that is a complex-phase microstructure containing ferrite and pearlite, and the microstructure having a ratio of a microstructure other than the ferrite and the pearlite of 1% or less, and the microstructure having a ratio of polygonal ferrite in the ferrite of less than 50%.