本发明提供可轻量化并且具有优异的疲劳极限的铁路用车轴。本公开提供的铁路用车轴(1)中,中央平行部(3)和一对嵌合部(2)的基材部(BM)的化学组成以质量%计包含:C:0.22~0.29%,Si:0.15~0.40%,Mn:0.50~0.80%,P:0.020%以下,S:0.040%以下,Cr:0.90~1.20%,Mo:0.15~0.30%,N:0.0200%以下,O:0.0040%以下,Ca:0~0.0010%,和,作为剩余部分的Fe和杂质。嵌合部(2)的直径DW相对于中央平行部(3)的直径DA的比为1.10~1.30。嵌合部硬化层(2H)的深度CW为2.5mm~0.10×DWmm。嵌合部硬化层深度CW相对于中央平行部硬化层深度CA的比为0.34~0.93。

    Provided is a railway axle that can achieve a reduction in weight and that has the excellent fatigue limit. In a railway axle (1) according to this disclosure, a chemical composition of a base metal portion (BM) of a center parallel portion (3) and a pair of fitting portions (2) consists of, in mass%, C: 0.22 to 0.29%, Si: 0.15 to 0.40%, Mn: 0.50 to 0.80%, P: 0.020% or less, S: 0.040% or less, Cr: 0.90 to 1.20%, Mo: 0.15 to 0.30%, N: 0.0200% or less, O: 0.0040% or less, Ca: 0 to 0.0010%, and the balance being Fe and impurities. A ratio of a diameter Dw of the fitting portion (2) to a diameter DA of the center parallel portion (3) is 1.10 to 1.30. A depth Cw of a fitting portion hardened layer (2H) is 2.5 mm to 0.10×DW mm. A ratio of the depth Cw of the fitting portion hardened layer to a depth CA of a center parallel portion hardened layer is 0.34 to 0.93.


    Zugriff

    Download


    Exportieren, teilen und zitieren



    Titel :

    铁路用车轴


    Erscheinungsdatum :

    2021-08-27


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Chinesisch


    Klassifikation :

    IPC:    C22C Legierungen , ALLOYS / B60B VEHICLE WHEELS , Räder für Fahrzeuge / C21D Veränderung der physikalischen Struktur von Eisenmetallen , MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS