公开(公告)号：US20050266927A1

公开(公告)日：2005-12-01

申请号：US11191909

申请日：2005-07-29

申请人： Kouichi Kuroda ,  Tatsuya Okui ,  Keisuke Hitoshio

发明人： Kouichi Kuroda ,  Tatsuya Okui ,  Keisuke Hitoshio

IPC分类号： B21B17/02 ,  B21B17/14 ,  B21B19/04 ,  B21B23/00 ,  B21B27/02 ,  F16D3/16

CPC分类号： B21B17/02 ,  B21B17/14 ,  B21B19/04 ,  B21B23/00 ,  B21B27/02

摘要： A steel tube hot-finished by the Mannesmann tube-making method is subjected to a simple grinding process for the inner surface, and thereafter to a cold drawing, so that the depth d of the concave portion in the concavo-convex profile forming the inner surface of the steel tube, the surface roughness Ra and the width w of the entrance in the concave portion are specified, or similarly the depth d of the concave portion in the concavo-convex profile, the Vickers hardness Hv of the inner surface layer and the width w of the entrance in the concave portion are specified, hollow parts for a drive shaft, which have an excellent fatigue strength and which is optimal to reduce the weight of a car body, can be produced. Accordingly, the application of the manufacturing method according to the present invention allows drive shafts for automobiles to be efficiently produced in a reduced manufacturing cost, thereby providing a significant advantage in the industry.

摘要翻译： 通过曼内斯曼管制造方法热轧的钢管对内表面进行简单的研磨处理，然后进行冷拉伸，使得凹凸轮廓中的凹部的深度d形成内部 规定了钢管的表面，凹部的入口的表面粗糙度Ra和宽度w，或类似地，凹凸型的凹部的深度d，内表面层的维氏硬度Hv， 规定了凹部的入口宽度w，可以制造具有优异的疲劳强度并且最适于减轻车体重量的用于驱动轴的中空部件。 因此，根据本发明的制造方法的应用允许以降低的制造成本有效地生产用于汽车的驱动轴，从而在工业中提供显着的优点。

公开(公告)号：US08147623B2

公开(公告)日：2012-04-03

申请号：US12244641

申请日：2008-10-02

申请人： Kikuo Asada ,  Osamu Endo ,  Katsunori Nagao ,  Keisuke Hitoshio

发明人： Kikuo Asada ,  Osamu Endo ,  Katsunori Nagao ,  Keisuke Hitoshio

IPC分类号： C22C38/02 ,  C22C38/04

CPC分类号： C22C38/02 ,  C21D8/10 ,  C21D9/08 ,  C21D9/14 ,  C21D2211/004 ,  C22C38/04 ,  F02M55/02 ,  F02M61/166 ,  F02M2200/03 ,  F02M2200/9053 ,  Y10S148/909

摘要： To provide a steel pipe as a fuel injection pipe with high material strength, high internal pressure limit free from fatigue failure, prolonged fatigue life, and high reliability. A steel pipe as a fuel injection pipe of 500 N/mm2 or higher tensile strength comprising, by mass, C: 0.12 to 0.27%, Si: 0.05 to 0.40%, and Mn: 0.8 to 2.0%, and the balance being Fe and impurities, the contents of Ca, P, and S in the impurities being Ca: 0.001% or less, P: 0.02% or less, and S: 0.01% or less, respectively, characterized in that the maximum diameter of nonmetallic inclusions present in at least in a region extending from the inner surface of the steel pipe to a depth of 20 μm is 20 μm or less. Further, this steel pipe may contain, in place of a portion of Fe, at least one selected from among Cr: 1% or less, Mo: 1% or less, Ti: 0.04% or less, Nb: 0.04% or less, and V: 0.1% or less.

摘要翻译： 提供具有高材料强度的钢管作为燃料喷射管，没有疲劳破坏的高内压极限，延长的疲劳寿命和高可靠性。 作为500N / mm 2以上的拉伸强度的燃料喷射管的钢管，以质量计C：0.12〜0.27％，Si：0.05〜0.40％，Mn：0.8〜2.0％，余量为Fe， 杂质中Ca，P，S的含量分别为Ca：0.001％以下，P：0.02％以下，S：0.01％以下，其特征在于，非金属夹杂物的最大直径存在于 至少在从钢管的内表面延伸到20μm的深度的区域中，为20μm以下。 此外，该钢管可以含有选自Cr：1％以下，Mo：1％以下，Ti：0.04％以下，Nb：0.04％以下的至少一种，代替Fe的一部分， V：0.1％以下。