STEEL FOR NITROCARBURIZING AND NITROCARBURIZED COMPONENT, AND METHODS OF PRODUCING SAME

Provided is a steel for nitrocarburizing that ensures mechanical workability before nitrocarburizing treatment. A steel for nitrocarburizing comprises: a chemical composition containing, in mass%, C: ≥ 0.02 % and < 0.15 %, Si: ≤ 0.30 %, Mn: 1.5-2.5 %, P: ≤ 0.025 %, S: ≤ 0.06 %, Cr: 0.5-2.0 %, Mo:...

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Bibliographische Detailangaben
Hauptverfasser:	KASAI Masayuki, IHARA Naoya, NISHIMURA Kimihiro
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	Provided is a steel for nitrocarburizing that ensures mechanical workability before nitrocarburizing treatment. A steel for nitrocarburizing comprises: a chemical composition containing, in mass%, C: ≥ 0.02 % and < 0.15 %, Si: ≤ 0.30 %, Mn: 1.5-2.5 %, P: ≤ 0.025 %, S: ≤ 0.06 %, Cr: 0.5-2.0 %, Mo: 0.005-0.2 %, V: 0.02-0.20 %, Nb: 0.003-0.20 %, Al: > 0.020 % and ≤ 1.0 %, Ti: > 0.0050 % and ≤ 0.015 %, N: ≤ 0.0200 %, Sb: 0.0030-0.010 %, with a balance being Fe and inevitable impurities, satisfying Expression (1) or (2); and a steel microstructure where an area ratio of bainite phase is > 50 %, a prior austenite grain size is ≤ 100 µm, ≥ 300/µm2 Ti precipitates with an equivalent circular particle size of ≤ 30 nm disperse, Sb segregates to prior austenite grain boundaries.