STEEL COMPONENT FOR MECHANICAL STRUCTURAL USE AND MANUFACTURING METHOD FOR SAME

Provided i s a steel component ior mechanical structural use naving increased fangue resistance and toughness without any reduction in machinability; also provided i s a manufacturing method for the same. A steel component: i s formed ：from steel which includes, i n mass%, 0.05-0.20% C , 0.10-1.00%...

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Hauptverfasser:	TAKADA HIROMASA, KUBOTA MANABU, NAKATSUKA JUNICHI, TANIGUCHI YOICHI, TERAMOTO SHINYA, FUJIMURA KAZUHIRO, KOGANEMARU SATOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS FORGE FURNACES FORGING GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS HAMMERING MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PRESSING METAL PUNCHING METAL RIVETING TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	Provided i s a steel component ior mechanical structural use naving increased fangue resistance and toughness without any reduction in machinability; also provided i s a manufacturing method for the same. A steel component: i s formed ：from steel which includes, i n mass%, 0.05-0.20% C , 0.10-1.00% Si, 0.75-3.00% Mn, 0.001 -0.050% P , 0.001-0.200% S , more than 0.20- 0.25% V , 0.01-1.00% Cr, 0.001-0.500% Al, and 0.0080-0.0200% N , with the remainder being F e and unavoidable impurities. The steel structure i s at least 95% bainite structure, in terms o f area ratio; the width o f the bainitic lath i s not more than ih ; V carbide having an average particle diameter o f 4-7nm i s dispersed and i s present i n the bainite structure; and the area ratio o f the V carbide in the bainite structure i s at least 0 . 18