A rolled round steel material for a steering rack bar, having a chemical composition consisting of C: 0.38 to 0.55%, Si: not more than 1.0%, Mn: 0.20 to 2.0%, S: 0.005 to 0.10%, Cr: 0.01 to 2.0%, Al: 0.003 to 0.10%, and N: 0.003 to 0.03%, with the balance being Fe and impurities, and P being not more than 0.030% in the impurities, and a microstructure consisting of ferrite (F), lamellar pearlite (LP), and cementite (C). The average grain diameter of (F), an area fraction of (LP), and the number of particles of spheroidal cementite (SC) among C are controlled in a region from the surface to a position at ½ radius and in a central part of the material. An average aspect ratio of F is controlled in a region from a surface to a position at ½ radius.


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    Titel :

    Rolled round steel material for steering rack bar and steering rack bar


    Beteiligte:
    HORIKAMI SADANORI (Autor:in) / HIGASHIDA MASASHI (Autor:in) / OKADA TAKAHIRO (Autor:in) / EGASHIRA MAKOTO (Autor:in) / NEISHI YUTAKA (Autor:in) / HASEGAWA TATSUYA (Autor:in) / MATSUMOTO HITOSHI (Autor:in)

    Erscheinungsdatum :

    12.12.2017


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Englisch


    Klassifikation :

    IPC:    C22C Legierungen , ALLOYS / B62D MOTOR VEHICLES , Motorfahrzeuge / C21D Veränderung der physikalischen Struktur von Eisenmetallen , MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS / F16H Getriebe , GEARING



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