MECHANICAL STRUCTURAL PART AND METHOD FOR MANUFACTURING SAME

Abstract: it is provided a mechanical structural part and a method of manufacturing the same. the mechanical structural part comprises a chemical composition containing c: 0.45% to 0.51%, si: 0.15% to 0.35%, mn: 0.60% to 0.90%, p: 0.030% or less, s: 0.025% or less, al: 0.040% to 0.059%, cr: 0.10% to 0.50%, and n: 0.0060% to 0.0100%, with the balance being fe and inevitable impurities, and a hardened layer by induction hardening and tempering treatment, wherein an area ratio of crystal grains each having a prior austenite grain size of 80 �m or less in the hardened layer is 80% or more, and a number ratio of grains each having a grain size twice or more than a mode of grain size in the hardened layer is 5% or less.

Inventor(s): Tomoki OTSUKA, Yuta IMANAMI

CPC Classification: C21D1/10 (MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class and at least one process covered by this subclass ; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials ))

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