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    SPRING AND MANUFACTURE METHOD THEREOF
    4.
    发明公开
    SPRING AND MANUFACTURE METHOD THEREOF 有权
    SPRING及其方法

    公开(公告)号：EP2602350A1

    公开(公告)日：2013-06-12

    申请号：EP11814765.1

    申请日：2011-08-04

    Applicant: Nhk Spring Co., Ltd.

    Inventor： SUZUKI, Takeshi ,  ONO, Yoshiki ,  KUROKAWA, Shimpei ,  SHIBAIRI, Kosuke

    IPC: C22C38/18 ,  B24C1/10 ,  C21D7/06 ,  C21D9/02 ,  F16F1/06

    CPC classification number: F16F1/021 ,  B24C1/10 ,  C21D1/18 ,  C21D7/06 ,  C21D8/065 ,  C21D9/02 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18

    Abstract: A spring with superior fatigue resistance and a production method therefor are provided by decreasing the material cost and simplifying the production process. The spring consists of, by mass %, 0.5 to 0.7 % of C, 1.0 to 2.0 % of Si, 0.1 to 1.0 % of Mn, 0.1 to 1.0 % of Cr, not more than 0.035 % of P, not more than 0.035 % of S, and the balance of Fe and inevitable impurities. The spring has a structure including not less than 65 % of bainite and 4 to 13 % of residual austenite by area ratio in a cross section, and the residual austenite contains carbon at an average concentration of 0.65 to 1.7 %. The spring has a compressive residual stress layer in a cross section from a surface to a depth of 0.35 mm to D/4, in which D (mm) in a circle-equivalent diameter of the cross section. The compressive residual stress layer has maximum compressive residual stress of 800 to 2000 MPa. The spring has a center portion with hardness of 550 to 650 HV in a cross section and has a high hardness layer with greater hardness than the center portion by 50 to 500 HV from a surface to a depth of 0.05 to 0.3 mm.

    STRENGTH MEMBER AND MANUFACTURING METHOD THEREFOR
    6.
    发明公开
    STRENGTH MEMBER AND MANUFACTURING METHOD THEREFOR 审中-公开
    德州大学德克萨斯州立大学

    公开(公告)号：EP2966186A1

    公开(公告)日：2016-01-13

    申请号：EP14760929.1

    申请日：2014-03-07

    Applicant: Nhk Spring Co., Ltd.

    Inventor： KUROKAWA, Shimpei ,  SUZUKI, Takeshi ,  SHIBAIRI, Kosuke

    IPC: C22C38/00 ,  C21D7/06 ,  C21D7/10 ,  C21D9/02 ,  C22C38/34 ,  F16F1/02

    Abstract: A strength member and a manufacturing method thereof in which settling resistance and yield strength can be substantially improved without reducing cost advantages or adding substantial process changes, is provided. A strength member comprises, by mass %, 0.5 to 0.7 % of C, 1.0 to 2.0 % of Si, 0.1 to 1.0 % of Mn, 0.1 to 1.0 % of Cr, 0.035 % or less of P, 0.035 % or less of S, and the balance of Fe and inevitable impurities, wherein an area ratio of bainite is 65 % or more, and an average dislocation density of a freely selected cross section is 2.0 × 10 16 m -2 or less.

    Abstract translation: 提供了一种强度构件及其制造方法，其中可以显着地提高耐沉降性和屈服强度，而不降低成本优点或增加实质的工艺变化。 强度构件以C为0.5〜0.7％，Si为1.0〜2.0％，Mn为0.1〜1.0％，Cr为0.1〜1.0％，P为0.035％以下，S为0.035％以下， ，余量为Fe和不可避免的杂质，贝氏体的面积率为65％以上，自由选择的截面的平均位错密度为2.0×10 16 m -2以下。

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