STEEL MATERIAL AND ITS PRODUCTION METHOD

PROBLEM TO BE SOLVED: To provide a steel material, even in the case a drive shaft or the like with small dimensions are produced, which can secure excellent strength, toughness or the like, and also has satisfactory machinability, and to provide its production method. SOLUTION: A steel material comp...

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Bibliographische Detailangaben
Hauptverfasser:	IGARASHI MASAHIKO, USUI KOKI, YANAGIDA WATARU, WATANABE HIDEO, SATO YUTAKA, NAKANA SATORU
Format:	Patent
Sprache:	eng
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:	PROBLEM TO BE SOLVED: To provide a steel material, even in the case a drive shaft or the like with small dimensions are produced, which can secure excellent strength, toughness or the like, and also has satisfactory machinability, and to provide its production method. SOLUTION: A steel material comprising prescribed amounts of C, Si, Mn, S, Ti, Cr, Al and B, and the balance iron with inevitable impurities, and in which the occupancy area ratio of ferrite is ≥30% and HRBis 85 to 95 is subjected to induction hardening. The surface of the steel material after being subjected to the hardening shows 640 to 730 by HV. Further, provide that the distance from the surface to a part showing 392 by HVis defined as effective hardened depth (t), and the radius of the steel material is defined as (r), the hardened layer ratio t/r is ≥0.4. COPYRIGHT: (C)2007,JPO&INPIT